WO2012111466A1

WO2012111466A1 - Gas combustion-type driving tool

Info

Publication number: WO2012111466A1
Application number: PCT/JP2012/052618
Authority: WO
Inventors: 典之西土; 直治石川; 康浩森岡
Original assignee: 株式会社マキタ
Priority date: 2011-02-17
Filing date: 2012-02-06
Publication date: 2012-08-23
Also published as: JP2012171021A

Abstract

In a gas combustion-type driving tool, when a contact arm is pressed against a material to be driven, a combustion chamber is closed and gas is supplied, and the gas is ignited upon triggering of a switch lever, so that a driving operation is performed. A conventional driving depth adjustment mechanism, in which the driving depth can be adjusted by changing the "on" position of the contact arm, has a configuration wherein manual operation of an operation member may cause the contact arm to move to the "on" position, and thus, this operation is to be prevented. An adjustment shaft (61) is disposed between a contact arm (55) and an operation member (62) for cutting depth adjustment, such that the operation member (62) is separated via the two-faced width part (61a) of the adjustment shaft (61) with regard to the movement of the contact arm (55) toward the "on" position, whereby an operation in this direction is prevented.

Description

Gas fired driving tool

The present invention relates to a gas combustion type driving tool.

A technique related to this type of driving tool is disclosed, for example, in Patent Document 1 below. The driving tool includes a tool body that includes a combustion mechanism mainly composed of a piston that reciprocates in a cylinder and a chamber that opens and closes a combustion chamber, and a handle portion that is provided so as to protrude sideways from the side of the tool body. When a trigger-type switch lever provided near the base of the handle is pulled with the fingertip of the hand holding the handle, an explosion caused by combustion of a mixture of combustible gas and outside air in the combustion chamber of the tool body The piston is moved downward (forward) by the force, and the driving tool is struck by the driver during the downward movement and is driven into the driving material. The driver is attached to the center of the lower surface of the piston, and the tip side thereof reaches into a driver guide provided at the tip of the tool body. A magazine containing a number of driving tools is coupled to the driver guide, and the driving tools are supplied one by one from the magazine into the driver guide in conjunction with the driving operation of the tool body.
This type of driving tool has a malfunction prevention function for preventing an inadvertent driving operation that is not intended by the user. A driver guide for guiding a driver for driving the driving tool is supported so as to be movable between an on position and an off position in the driving direction with respect to the tool body, and an upper end side of the driver guide is coupled to the chamber. When the tip of the driver guide (injection port) is brought into contact with the driving material and the tool body is pressed in the driving direction, the driver guide moves up relatively to the ON position, which causes the chamber to move up integrally. The combustion chamber is closed. When the combustion chamber is closed, flammable gas is supplied, and then the plug is ignited by the pulling operation of the switch lever to perform the driving operation. In this way, the combustion chamber is not closed unless the tool body is pressed in the driving direction and the driver guide is moved to the on position, and therefore, the driving operation is not performed even if the switch lever is pulled, thereby preventing the malfunction. It has come to be. Thus, the driver guide functions as a pressing detection member for detecting the pressing operation of the tool body.
Conventionally, a driver guide provided with a switch lever pulling operation unlocking function in addition to the above-described combustion chamber opening / closing function has been provided. According to such a configuration, unless the driver guide is relatively moved to the ON position, the combustion chamber is not closed and the switch lever cannot be pulled, so that an inadvertent driving operation is more reliably prevented.
Further, a technique in which a driver guide is provided with a driving depth adjusting function for adjusting the driving depth of the driving tool in addition to the above-described malfunction prevention function is known. This driving depth adjusting function is configured to change the driving depth of the driving tool by changing the ON position of the driver guide and changing the distance between the lower moving end position of the driver and the driving material. . In the following Patent Document 1, the driver guide is divided into two parts: a distal end on the injection port side and a proximal end on the chamber side, and the position of the distal end with respect to the proximal end is changed to change the overall length of the driver guide. The driving depth is adjusted by changing the ON position of the driver guide relative to the lower end position of the driver. The relative position of the distal end portion with respect to the base end portion of the driver guide is fixed by tightening a fixing screw.
Further, in Patent Document 2, in a compressed air drive type nailing machine, a contact arm (pressing detection member) for preventing malfunction is provided so as to be relatively movable along a driver guide fixed to the tool body. The tip end of the contact arm on the injection port side and the base end on the switch lever side are coupled by an operation member and a screw shaft portion, and the screw shaft portion is displaced in the axial direction by rotating the operation member to thereby move the contact arm of the contact arm. A technique for adjusting the driving depth by changing the ON position of the contact arm with respect to the lower end position of the driver by changing the total length is disclosed. Since the driving tool disclosed in Patent Document 2 uses compressed air as a power source, unlike the gas combustion type driving tool disclosed in Patent Document 1, the malfunction prevention function has a contact arm. This is done by switching between valid and invalid of the pulling operation of the switch lever by relative movement.
As described above, in the technique disclosed in the following patent document, the user can easily pick a part where the fixing screw and the operation member (the driving depth adjusting member) are easily operated in order to facilitate the driving depth adjusting operation. It was arranged so that it was exposed or protruded.

US Pat. No. 6,138,887 Japanese Patent No. 3137228

However, the fixing screw and the operating member for adjusting the driving depth are configured to move up and down integrally with the driving guide by pressing the driver guide or the contact arm against the driving material. For example, the driver guide or the contact arm is integrally moved to the on-position side when it interferes with other parts or when the user mistakenly applies a force in the upward movement direction of the driver guide or the contact arm. In this respect, it is necessary to take measures to prevent the malfunction of the conventional driver guide or contact arm with respect to the movement toward the ON position side more reliably.
It is an object of the present invention to more reliably prevent an inadvertent movement of a pressing detection member having a combustion chamber opening / closing function and a driving depth adjustment function to an on position in a gas combustion type driving tool. .

The above problems are solved by the following invention.
A first invention is provided with a piston that reciprocates in a cylinder, a tool body that mainly includes a combustion mechanism that mainly opens and closes a combustion chamber that is an upper chamber of the piston, and a tool body that protrudes from the tip of the tool body. A driver guide that guides the driver for driving the driving tool, and a pressing detection member that is relatively movable between an on position and an off position along the moving direction of the driver. When the pressing detection member is moved to the on position relatively by the pressing operation of the tool body in the driving direction by bringing the tip of the tool into contact with the driving material, the chamber moves and the combustion chamber is closed. This is a gas combustion type driving tool that is made by changing the ON position of the pressing detection member with respect to the lower end position of the driver. A driving depth adjusting mechanism for changing the driving depth of the driving tool with respect to the driving material is provided, and the operation member of the driving depth adjusting mechanism is separated from the pressing detection member with respect to the movement of the pressing detection member to the ON position. The driving tool is configured.
According to the first invention, when the tool body is pressed in the driving direction with the tip of the pressing detection member in contact with the driving material, the pressing detection member moves upward relative to the driver to the on position. This moves the chamber up and closes the combustion chamber. The driving depth of the driving tool with respect to the driving material is determined by the relative position between the ON position of the pressing detection member and the lower moving end position of the driver. For this reason, the driving depth of the driving tool can be adjusted by changing the ON position of the pressing detection member. The ON position of the pressing detection member can be changed by a driving depth adjusting mechanism.
The driving depth adjusting mechanism includes an operation member that is operated when the user adjusts the driving depth. The operation member is configured to be separated with respect to the movement of the pressing detection member toward the on position. For this reason, even if the pressing detection member moves to the on position, the operation member does not move in the same direction, and the pressing detection member is inadvertently turned on even if an external force in the same direction acts on the operation member. Does not move to the side.
As described above, since the operation member of the driving depth adjusting mechanism is separated from the pressing detection member with respect to the movement of the pressing detection member toward the ON position and the movement of the chamber in the combustion chamber closing direction, Even if an external force is inadvertently applied to an operating member such as an operating member of the driving depth adjusting mechanism, the pressing detection member does not move to the on position side, and thus the operating member is It is possible to reliably prevent an inadvertent driving operation of the driving tool while ensuring good operability.

According to a second invention, in the first invention, the pressing detection member and the driving depth adjusting mechanism are supported inside a nose case provided in the tool body, and the pressing detection member protrudes from the tip of the nose case. The driving member of the driving depth adjusting mechanism is a driving tool configured to be rotatable from the outside of the nose case through a window provided in the nose case.
According to the second aspect of the present invention, the pressing detection member and the driving depth adjusting mechanism are covered with the nose case except for the front end portion of the pressing detecting member and the operating member of the driving depth adjusting mechanism. Unintentional careless operation can be prevented more reliably.
According to a third aspect, in the second aspect, the driving depth adjusting mechanism includes an adjustment shaft coupled to the pressing detection member via the screw shaft portion so as to be relatively rotatable, and the operation member is axially connected to the adjustment shaft. When the operating member is rotated, the adjustment shaft rotates integrally and is displaced in the axial direction with respect to the pressing detecting member via the screw shaft portion. This is a driving tool having a configuration in which the ON position changes.
According to the third invention, when the operation member is operated, the adjustment shaft rotates around the axis. When the adjustment shaft rotates about the axis, the adjustment shaft is displaced in the driver moving direction with respect to the pressing detection member via the screw shaft portion, and the ON position of the pressing detection member changes. When the ON position of the pressing detection member changes, the position of the injection port that is the tip of the pressing detection member changes with respect to the lower end position of the driver, thereby changing the driving depth of the driving tool with respect to the driving material. Since the adjustment shaft is integrated with the pressing detection member with respect to the movement of the pressing detection member toward the ON position, the adjustment shaft moves integrally. On the other hand, the operation member is integrated only with respect to the adjustment shaft for the rotation operation, and is separated for the axial displacement. Therefore, even if the pressing detection member moves to the on position side, the operation member does not move in the same direction. Conversely, even if an external force in the same direction is applied to the operation member, the pressing detection member moves to the on position side. There is no end. Therefore, even if an external force is applied in a direction to move the pressing detection member to the on position side due to interference of the other members with the operation member of the driving depth adjusting mechanism, the pressing detection member moves to the on position side. Thus, inadvertent driving operation unintended by the user can be prevented while ensuring good operability of the operating member.

A fourth invention is a driving tool according to any one of the first to third inventions, wherein the driver guide is supported so as to be movable in the driving direction with respect to the tool body, and the driver guide is a pressing detection member. is there.
According to the fourth aspect of the invention, the driver guide that guides the driver in the driving direction functions as a pressing detection member. For this reason, when the tool main body is pressed in the driving direction in a state where the tip (injection port) of the driver guide is in contact with the driving material, the driver guide moves upward with respect to the tool main body and reaches the on position. The upper part of the driver guide as a pressing detection member is coupled to the chamber. For this reason, when the driver guide moves to the ON position, the chamber moves up integrally and the combustion chamber is closed.
Since the driver guide itself functions as a pressing detection member, for example, it is not necessary to provide a separate contact arm as a pressing detection member for the driver guide fixed to the tool body, thereby simplifying the configuration. it can.
5th invention is the driving tool arrange | positioned in the state which does not protrude from the window part of a nose case in 2nd or 3rd invention.
According to the fifth aspect, it is possible to prevent other members from interfering with the operation member, thereby preventing an inadvertent rotation operation of the operation member, so that the once-set driving depth is inadequate. It can be prevented from being changed to preparation.
According to a sixth invention, in any one of the first to fifth inventions, the combustion mechanism has a configuration in which the plug is ignited by pulling the switch lever, and the switch lever is moved to the ON position of the pressing detection member. This is a driving tool that is configured to be capable of being pulled by moving or to be effective in the pulling operation.
According to the sixth invention, when the pressing detection member is relatively moved to the ON position by the pressing operation of the tool body, the chamber is moved up and the combustion chamber is closed, and the switch lever can be pulled and operated. Switch to the state where the switch lever pulling operation is enabled. For this reason, if the pressing detection member remains in the off position, not only the combustion chamber is not closed, but also the switch lever cannot be pulled, or even if the switch lever is pulled, this is invalidated and the combustion chamber is Since the plug is not ignited, an inadvertent driving operation can be prevented more reliably.

1 is an overall side view of a driving tool according to an embodiment of the present invention. It is the whole side view which looked at the driving tool concerning the embodiment of the present invention from the direction of arrow (II) in Drawing 1. It is a longitudinal cross-sectional view of a driving nose part. This figure shows a state where the contact arm is located at the off position with the driving depth set to the deepest. It is a longitudinal cross-sectional view of a driving nose part. This figure shows a state where the contact arm is located at the ON position with the driving depth set to the deepest. It is a longitudinal cross-sectional view of a driving nose part. This figure shows a state where the contact arm is located at the OFF position with the driving depth set to the shallowest. It is a longitudinal cross-sectional view of a driving nose part. This figure shows a state in which the contact arm is located at the ON position with the driving depth set to the shallowest.

Next, an embodiment of the present invention will be described with reference to FIGS. In the following description, in the vertical direction of the member or configuration, the driving direction is described as the lower side or the front end side, and the opposite is described as the upper side or the rear side.
As shown in FIG. 1, the driving tool 1 of this embodiment includes a tool body 10, a handle portion 3, and a magazine 4. The tool body 10 includes a cylinder 12 inside a body case 11. A piston 13 is accommodated inside the cylinder 12 so as to be able to reciprocate. A damper 17 is attached to the lower part of the cylinder 12 for restricting the lower end of the piston 13 and absorbing an impact when the lower end is reached. A driver 14 for hitting the driving tool is attached to the center of the lower surface of the piston 13. The driver 14 is a long bar, and the tip side thereof passes through the inner peripheral side of the damper 17 and reaches a driving nose 50 provided at the tip of the tool body 10.
A combustion chamber 20 is formed on the lower surface side of the cylinder head 16 provided on the rear surface of the tool body 10 on the upper surface side of the piston 13. The combustion chamber 20 is opened and closed by the vertical movement of the cylindrical combustion chamber valve 24. The combustion chamber valve 24 is integrally attached along the upper portion of the chamber 21. The chamber 21 has a substantially cylindrical shape and is supported so as to be movable up and down along the outer peripheral side of the cylinder 12. FIG. 1 shows a state in which the combustion chamber valve 24 is moved downward with the chamber 21 and the combustion chamber 20 is opened. As shown in FIG. 2, the lower end position of the chamber 21 and the open position of the combustion chamber valve 24 are provided on the outer periphery of the cylinder 12 with a stopper portion 12b for regulating the lower end position of the chamber 21. Yes. The stopper portion 12b is attached along the upper surface of the flange portion 12a provided on the outer periphery of the cylinder 12. The closed position of the combustion chamber valve 24 that is the upper end position of the chamber 21 is regulated by the upper peripheral edge of the chamber 21 coming into contact with the cylinder head 16 attached to the rear portion of the main body case 11. When the combustion chamber valve 24 moves upward to reach a closed position where the combustion chamber valve 24 comes into contact with the cylinder head 16, the combustion chamber 20 is airtightly closed.
In the combustion chamber 20, a stirring fan 23 that is rotated by an electric motor 22 and a spark plug (not shown in the figure) are arranged. The electric motor 22 and the spark plug are attached to the cylinder head 16 attached to the rear part of the main body case 11. A combustion chamber 20 that is airtightly closed is formed by the combustion chamber valve 24, the piston 13, and the cylinder head 16 that are integrally moved up by the upward movement of the chamber 21. The upward movement of the chamber 21 is performed by an upward movement operation to an ON position of a contact arm 55 described later.
A cassette type gas cylinder 25 is accommodated in the side portion of the tool body 10. The gas cylinder 25 can be replaced by opening the lid 26 provided at the rear part of the main body case 11. A fan switch 8 is disposed on the side of the tool body 10 and on the side of the combustion chamber valve 24. When the combustion chamber valve 24 is moved upward to the closed position by the upward operation of the contact arm 55 to the on position, the gas cylinder 25 is opened by a known mechanical means (not shown), and a certain amount of combustible gas is generated in the combustion chamber 20. , The fan switch 8 is turned on and the electric motor 22 is started, whereby the air-fuel mixture is generated by the rotation of the agitating fan 23 in the combustion chamber 20 which is hermetically closed.
The handle portion 3 is provided so as to protrude from the side portion of the tool body 10 to the user side (right side in FIG. 1). The user grips the handle portion 3 with one hand and uses the driving tool 1 for driving work. A switch lever 5 and an ignition switch 6 are disposed on the bottom side of the base portion of the handle portion 3. When the switch lever 5 is pulled with the fingertip of the hand holding the handle portion 3, the ignition switch 6 is turned on and the ignition plug is ignited. A rechargeable battery pack 7 is used as a power source for the electric motor 22 and the spark plug. The battery pack 7 can be used repeatedly by removing and charging.
The magazine 4 accommodates a number of driving tools n to n. The magazine 4 is coupled to the driving nose part 50. The magazine 4 is provided with a feed mechanism for driving the driving tools n one by one to the nose portion 50 in conjunction with the driving operation of the tool body 10.

The driving nose portion 50 has a function of guiding the driver 14 in order to drive a single driving tool n supplied from the magazine 4 with the driver 14 and drive it into the driving material W. A nose case 51 is attached to the lower part of the tool body 10. A driver guide having a long cylindrical shape is supported on the inner peripheral side of a cylindrical guide portion 51 c provided on the lower side of the nose case 51. The driver 14 is guided up and down in the inner peripheral hole of the driver guide, and one driving tool n is supplied. In the driving tool 1 according to the present embodiment, a type in which the driver guide is supported so as to be further vertically movable with respect to the nose case 51 and also has a function as a contact arm is illustrated. Hereinafter, the contact arm 55 having a driver guide function will be described. The contact arm 55 corresponds to the pressing detection member described in the claims. Details of the driving nose portion 50 are shown in FIG.
The contact arm 55 has a function of guiding the driver 14 as described above, a function of opening and closing the combustion chamber 20 by the vertical movement of the chamber 21, and a function of adjusting the driving depth of the driving tool n. The present embodiment is characterized by a driving depth adjusting mechanism 60 for adjusting the driving depth of the driving tool n with respect to the driving material W. The driver 14 is guided up and down in the inner peripheral hole 55a of the contact arm 55, and one driving tool n is supplied to the magazine 4 in the inner peripheral hole 55a.
The contact arm 55 is connected to the chamber 21 via a coupling member 56 of the driving depth adjusting mechanism 60. For this reason, the contact arm 55 and the chamber 21 move up and down together. When the contact arm 55 moves up to the ON position, the combustion chamber valve 24 moves to a closed position where the combustion chamber 20 is closed in an airtight manner. When the contact arm 55 moves downward and returns to the off position, the combustion chamber valve 24 moves downward and the combustion chamber 20 is opened.
The coupling member 56 of the driving depth adjusting mechanism 60 described later includes a coupling plate portion 56a and two

coupling arm portions

56b and 56b extending upward from two opposing positions around the coupling plate portion 56a. FIG. 2 shows the upper portion of one coupling arm portion 56b. The upper portions of both the connecting

arm portions

56b and 56b are bent inwardly in an L shape and project to the inner peripheral side of the chamber 21. Compression springs 53 are interposed between the overhanging

portions

56 c and 56 c and the flange portion 12 a provided on the outer periphery of the cylinder 12. The overhanging

portions

56c, 56c and the chamber 21 are urged in the opening direction (downward movement side) by the compression springs 53, 53, and the contact arm 55 is urged toward the off position side (downward movement side).
Further, a restriction rod 54 is supported on the switch lever 5 so as to be tiltable up and down via a support shaft 54a. In FIG. 1, only the front end portion of the regulating rod 54 is visible. The tip of the regulation rod 54 is in sliding contact with the outer periphery of the chamber 21. The tilting range of the restricting rod 54 is restricted by the ON position or the OFF position of the contact arm 55, and the state is switched between a state where the pulling operation of the switch lever 5 is allowed and a state where it is restricted. In the case of the present embodiment, as shown in FIG. 1, when the contact arm 55 is located at the off position, the tip end portion of the regulating rod 54 engages with the regulating convex portion 21 a provided on the outer periphery of the chamber 21 and tilts. Is restricted, the pulling operation of the switch lever 5 is restricted. On the other hand, when the contact arm 55 is turned on, the chamber 21 moves upward and the tip of the regulating rod 54 is disengaged from the regulating convex portion 21a, thereby allowing the regulating rod 54 to tilt and allowing the switch lever 5 to move. It is in a state where it can be pulled. Therefore, in the driving tool 1 according to the present embodiment, the switch lever 5 can be pulled only when the contact arm 55 is turned on, and the switch lever 5 can be pulled when the contact arm 55 is not turned on. Accordingly, inadvertent pulling operation of the switch lever 5 is prevented.

As shown in FIG. 1, when the tip of the contact arm 55 is brought into contact with the driving material W and the tool body 10 is pressed in the driving direction, the contact arm 55 is relatively opposed to the compression springs 53, 53 described above. Move up to the on position. The upward movement distance of the contact arm 55 from the off position to the on position is equal to the vertical movement distance of the combustion chamber valve 24 and is fixed at a constant distance. By changing the relative position (ON position) between the combustion chamber valve 24 and the contact arm 55 while maintaining this constant upward movement distance, the tip of the driver 14 at the lower end position of the piston 13 with respect to the driving material W The relative position (the driving depth of the driving tool n) can be changed.
The driving depth adjusting mechanism 60 has a configuration capable of adjusting the driving depth of the driving tool n by changing the ON position of the contact arm 55 (relative position with respect to the chamber 21 and the combustion chamber valve 24). Details of the driving depth adjusting mechanism 60 are shown in FIG. The driving depth adjusting mechanism 60 is accommodated in a mechanism accommodating portion 51a provided so as to rise on the back side of the nose case 51 (left side portion in FIG. 3 and subsequent figures).
The driving depth adjusting mechanism 60 of this embodiment includes an adjusting shaft 61 along the side portion of the contact arm 55. The head 61e of the adjustment shaft 61 is coupled to the coupling plate portion 56a of the coupling member 56 so as not to move in the axial direction but to be rotatable about the axis.
In the middle of the adjustment shaft 61 in the axial direction, a two-surface width portion 61 a is provided. A cylindrical operation member 62 is supported on the two-surface width portion 61a. The operation member 62 is relatively movable in the axial direction with respect to the adjustment shaft 61 via the two-surface width portion 61a, and is integrated for rotation around the axis. A compression spring 63 is interposed on the inner peripheral side of the operation member 62 and around the adjustment shaft 61. The compression spring 63 is interposed between the upper bottom portion of the operation member 62 and the pressing plate 64. The compression plate 63 urges the pressing plate 64 downward. The pressing plate 64 is movable in the axial direction with respect to the inner peripheral hole of the operation member 62 and is integrated with respect to rotation around the axis. Therefore, the pressing plate 64 rotates integrally with the operation member 62, and is pressed against the receiving portion 51b provided in the mechanism housing portion 51a by the urging force of the compression spring 63 independently of the operation member 62. . When the pressing plate 64 is pressed against the receiving portion 51b by the urging force of the compression spring 63, an appropriate rotational resistance is given to the operation member 62. The rotation resistance provides an appropriate rotation operation resistance to the operation member 62, and prevents the adjustment position of the operation member 62 once adjusted from being inadvertently displaced due to vibration or the like. In the present embodiment, a plurality of protrusions extending in the radial direction are provided at appropriate intervals in the circumferential direction on both pressing surfaces of the pressing plate 64 and the receiving portion 51b that are in contact with each other, and the rotation of the operation member 62 is performed. The operation has a so-called click feeling.

The side portion of the operation member 62 enters the rotation operation window 51d provided in the mechanism housing portion 51a and slightly protrudes to the outside. Therefore, the operation member 62 can be rotated from the outside through the window 51d, and the displacement in the axial direction is reliably regulated by the window 51d.
An arrow indicating the rotation direction of the operation member 62 and a display plate 65 indicating the driving depth of the driving tool n are attached to the outer surface of the mechanism housing 51a and below the window 51d. Further, the front cover 15 of the tool body 10 is covered on the outer surface of the mechanism housing portion 51a and above the window portion 51d. For this reason, although the operation member 62 slightly protrudes from the side of the window 51d, the operation member 62 does not protrude from the display plate 65 positioned below or the front cover 15 positioned above. Yes. For this reason, it is prevented that a user's hand, other articles | goods, etc. contact carelessly with respect to the operation member 62, and the position shift of the adjustment position is prevented.
A screw shaft portion 61 b is provided on the tip end side of the adjustment shaft 61. A restriction shaft portion 61c is provided on the tip end side of the screw shaft portion 61b. A flange portion 61d is provided at the tip of the restriction shaft portion 61c. The screw shaft portion 61 b is fastened in the screw hole 66 a of the coupling block 66 engaged with the side portion of the contact arm 55. An engagement groove 66 b is formed on the side of the coupling block 66, and an engagement protrusion 55 b is formed on the side of the contact arm 55. As shown in the figure, the engaging convex portion 55 b is inserted into the engaging groove portion 66 b, and the coupling block 66 moves up and down integrally with the contact arm 55.
An elastic member 67 having an annular shape made of urethane rubber is attached to the restriction shaft portion 61c of the adjustment shaft 61. The elastic member 67 is interposed between the screw hole 66a of the coupling block 66 and the escape hole 66c of the flange portion provided below the elastic member 67 and is not displaced in the axial direction. The flange portion 61d provided at the tip of the regulating shaft portion 61c is provided with a diameter that can pass through the escape hole 66c but cannot pass through the inner peripheral hole of the elastic member 67. Since the elastic member 67 restricts the displacement in the tightening direction and the loosening direction of the screw shaft portion 61b with respect to the screw hole 66a, the elastic member 67 is a stopper for the relative displacement of the adjusting shaft 61 in the axial direction with respect to the coupling block 66. Function as.

When the adjusting shaft 61 rotates integrally around the axis by the rotation operation of the operating member 62, the coupling block 66 is displaced up and down with respect to the adjusting shaft 61 through the meshing of the screw shaft portion 61b and the screw hole 66a. The relative position of the contact arm 55 in the vertical direction with respect to the coupling plate portion 56a of the member 56 changes. By changing the relative position of the contact arm 55 in the vertical direction with respect to the coupling member 56 via the driving depth adjusting mechanism 60, the lowered end position (off position) and the raised end position (on position) of the contact arm 55 are changed. Can be made. As described above, the vertical movement distance between the ON position and the OFF position of the contact arm 55 is equal to the distance between the closing position and the opening position of the combustion chamber valve 24, so that the driving depth can be adjusted. Regardless of the fixed stroke.
3 and 5 show a state in which the contact arm 55 is located at the off position. FIG. 3 shows a state where the driving depth is adjusted to the maximum, and FIG. 5 shows a state where the driving depth is adjusted to the minimum. 4 and 6 show a state in which the contact arm 55 is located at the on position. FIG. 4 shows a state in which the driving depth is adjusted to the maximum as shown in FIG. FIG. 6 shows a state in which it is moved up to the ON position with the driving depth adjusted to the minimum as shown in FIG.
In the driving depth adjusting mechanism 60, when the driving depth is adjusted to the maximum as shown in FIGS. 3 and 4, the tightening amount of the screw shaft portion 61b of the adjusting shaft 61 with respect to the screw hole 66a of the coupling block 66 is the largest. It is deeper (larger). On the other hand, when the driving depth is adjusted to the minimum as shown in FIGS. 5 and 6, the tightening amount of the screw shaft portion 61b with respect to the screw hole 66a is the shallowest (smaller).
As described above, when the adjustment shaft 61 is rotated around the shaft, thereby deepening the screw shaft portion 61b into the screw hole 66a, the ON position of the contact arm 55 is displaced upward as shown in FIG. The driving depth increases. On the other hand, when the tightening of the screw shaft portion 61b into the screw hole 66a is shallow, the ON position of the contact arm 55 is displaced downward as shown in FIG. In view of the position of the guide portion 51c of the nose case 51 and the contact arm 55 moved to the ON position, the contact arm 55 is displaced further upward in FIG. 4 than in FIG. This is understood from the fact that the projecting dimension (the driving depth) from the tip (the driving portion) of the contact arm 55 is increased.
The adjustment shaft 61 is rotated by rotating the operation member 62. The operation member 62 can be rotated from the outside through the window 51 d of the nose case 51.
When the tool body 10 is pressed in the driving direction with the tip of the contact arm 55 as a pressing detection member in contact with the driving site, the contact arm 55 urged to the off position side by the compression springs 53 and 53 is nose. It moves up relative to the guide portion 51c of the case 51 to reach the on position. When the contact arm 55 is turned on, the combustion chamber valve 24 is closed in an airtight manner, and a certain amount of combustion gas is injected from the gas cylinder 25 into the combustion chamber 20, and the fan switch 8 is turned on and the electric motor 22 is turned on. As a result, the agitating fan 23 rotates to generate an air-fuel mixture in the combustion chamber 20.
Further, when the contact arm 55 is turned on, the switch lever 5 can be pulled. Accordingly, when the switch lever 5 is pulled after the contact arm 55 is turned on, the ignition switch 6 is turned on and the ignition plug is ignited. As a result, the air-fuel mixture in the combustion chamber 20 is instantly burned and the explosion at that time The piston 13 moves down in the cylinder 12 by the force. The driver 14 that moves down integrally with the piston 13 strikes one driving tool n supplied into the inner peripheral hole 55a of the contact arm 55 and drives it out from the tip (injection port) of the contact arm 55.
When the piston 13 reaches the bottom dead center and the driving of the driving tool n is completed, the piston upper chamber side is exhausted through an exhaust port (not shown). The piston 13 is returned to the top dead center by the heat contraction on the piston upper chamber side by the exhaust. Thereafter, when the pressing operation of the contact arm 55 is released, the combustion chamber 20 is opened to the atmosphere, and a series of driving operations of the driving tool 1 is completed.

According to the driving tool 1 of the present embodiment configured as described above, the driving depth of the driving tool n is adjusted by changing the ON position of the contact arm 55 as a pressing detection member that is relatively displaced during driving operation. Can do. The contact arm 55 has a function as a driver guide for guiding the driver 14, a function for opening and closing the combustion chamber 20, and a function for releasing the pulling operation restriction state of the switch lever 5 in addition to the driving depth adjusting function. For this reason, the contact arm 55 prevents an inadvertent driving operation.
The adjustment of the driving depth can be performed by rotating the operation member 62 of the driving depth adjusting mechanism 60 provided in the driving nose part 50. When the operation member 62 is rotated, the adjustment shaft 61 rotates about the axis. When the adjustment shaft 61 rotates about the axis, the adjustment shaft 61 is displaced in the driver moving direction with respect to the contact arm 55 via the screw shaft portion 61b, and the ON position of the contact arm 55 changes. When the ON position of the contact arm 55 is changed, the position of the injection port that is the tip of the contact arm 55 is changed with respect to the lower end position of the driver 14, so that the driving depth of the driving tool n with respect to the driving material W is increased. Change.
The adjustment shaft 61 is integrated with the contact arm 55 with respect to the movement of the contact arm 55 toward the on position. On the other hand, since the operation member 62 is engaged with the adjustment shaft 61 via the two-surface width portion 61a, only the rotation operation is integrated, and the axial displacement is separated and can be relatively displaced. It has a configuration. For this reason, even if the contact arm 55 moves to the ON position side and the adjustment shaft 61 moves up integrally therewith, the operation member 62 does not move in the same direction. Therefore, even if an external force in the same direction is applied by touching the operation member 62 or by interference of other members, the contact arm 55 does not move to the on position side, which is inadvertent. Can be reliably prevented.
Further, the displacement of the operation member 62 in the vertical direction is also reliably restricted by the side portion of the operation member 62 entering the window 51 d of the nose case 51.
As described above, the operation member 62 of the driving depth adjusting mechanism 60 is separated from the contact arm 55 with respect to the movement of the contact arm 55 toward the ON position and the movement of the chamber 21 in the combustion chamber closing direction. Therefore, even if an external force is applied in the direction of moving the contact arm 55 to the on position side due to interference of the other members with the operation member 62, the contact arm 55 does not move to the on position side. As a result, the operation member 62 is protruded to the side through the window 51d, and an unintentional driving operation of the driving tool 1 can be surely prevented while ensuring good operability.

Further, only a part of the side part necessary for the operation of the operation member 62 is configured to protrude to the outside through the window 51d, and the display plate 65 is located on the front side of the protruding part and the tool body 10 on the rear side. Since the front cover 15 is positioned, it is possible to avoid other members from interfering with the operation member 62 in this respect as well, and to prevent the operation member 62 from being inadvertently rotated. It is possible to prevent the setting depth once set from being inadvertently changed.
Furthermore, in the driving tool 1 of the present embodiment, the driver guide itself that guides the driver 14 in the driving direction functions as a pressing detection member. Therefore, for example, a separate pressing detection member for the driver guide fixed to the tool body. As a result, it is not necessary to provide the contact arm so as to be relatively movable, so that the configuration can be simplified.
Further, according to the driving tool 1 of the present embodiment, when the contact arm 55 is relatively moved to the ON position by the pressing operation of the tool body 10, the chamber 21 is moved upward to close the combustion chamber 20, and the switch lever 5 is moved. Switch to a state where pulling operation is possible. For this reason, if the contact arm 55 remains in the OFF position, not only the combustion chamber 20 is not closed, but also the switch lever 5 cannot be pulled, so that an inadvertent driving operation can be prevented more reliably.
Various modifications can be made to the embodiment described above. For example, the contact arm 55 having the function of a driver guide for guiding the driver 14 is illustrated. However, in addition to the driver guide fixed to the tool body 10, the contact arm 55 is pressed against the tool body so as to be relatively displaceable up and down. A contact arm as a detection member may be provided, and a driving depth adjusting mechanism exemplified for this contact arm may be provided.
In addition, the configuration in which the pulling operation restriction state of the switch lever 5 is released using the relative displacement of the contact arm 55 to the on position is exemplified. The switching structure may be separated from the operation of the contact arm.
In the driving depth adjusting mechanism 60, the adjustment shaft 61 is provided with the two-surface width portion 61a, and the operation member 62 is separated from the movement of the contact arm 55 to the on position side via the two-surface width portion 61a. A spline or serration may be provided in place of the two-surface width portion 61a.

Claims

A tool body that includes a piston that reciprocates in a cylinder, a combustion mechanism that mainly includes a chamber that opens and closes a combustion chamber that is an upper chamber of the piston, and a tool that projects from the tip of the tool body and is used for hitting a driving tool. A driver guide for guiding the driver and a pressing detection member provided to be relatively movable between an on position and an off position along the moving direction of the driver, and driving the tip of the pressing detection member Gas combustion in which the chamber moves in the closing direction of the combustion chamber when the pressing detection member is moved to the ON position relatively by the pressing operation in the driving direction of the tool main body in contact with the material. A driving tool of the type,
The pressing detection member includes a driving depth adjustment mechanism that changes a driving depth of the driving tool with respect to a driving material by changing an ON position with respect to a lower end position of the driver, and adjusting the driving depth. The operating member of the mechanism is a driving tool configured to be separated from the pressing detection member with respect to the movement of the pressing detection member to the on position.
The driving tool according to claim 1, wherein the pressing detection member and the driving depth adjusting mechanism are supported inside a nose case provided in the tool body, and the pressing detection member extends from a tip of the nose case. A driving tool that is protruded and configured so that the operating member of the driving depth adjusting mechanism is rotatably provided from the outside of the nose case through a window provided in the nose case.
The driving tool according to claim 2, wherein the driving depth adjusting mechanism includes an adjusting shaft coupled to the pressing detection member via a screw shaft portion so as to be relatively rotatable, and the operating member is mounted on the adjusting shaft. It is axially movable and is engaged in rotation. When the operation member is rotated, the adjustment shaft rotates integrally and is displaced in the axial direction with respect to the pressing detection member via the screw shaft portion. A driving tool configured to change the ON position of the pressing detection member.
The driving tool according to any one of claims 1 to 3, wherein the driver guide is supported so as to be movable in the driving direction with respect to the tool body, and the driver guide serves as the pressing detection member. Driving tool.
4. The driving tool according to claim 2, wherein the operating member is arranged so as not to protrude from a window portion of the nose case.
The driving tool according to any one of claims 1 to 5, wherein the combustion mechanism has a configuration in which a plug is ignited by a pulling operation of a switch lever, and the switch lever is configured to turn on the pressing detection member. A driving tool that can be pulled by moving to a position, or that enables the pulling operation.