US2515875A - Door check - Google Patents

Description

July 18, 1950 J. J. JONES DOOR CHECK Filed Feb, 13, 1947 James J. Jo/)e5 14 INVENTOR.

16' AIToRNE Patented July 18, 950

1 Claim.

The invention relates to door checks, andvhas for its object to provide a device of this kind of the cylinder and piston type, so mounted and constructed, that a wide range of opening of the door is accomplished with `the minimum amount of movement of the piston within the cylinder. I

A further object is to provide a door check comprising a hingedly mounted cylinder having a piston and piston rod therein, and carried by the hinged door, and spring means cooperating with the piston rod whereby, the piston and piston rod will be held against axial movement as the door is partially opened and moved with the cylinder without axial movement upon excessive movement of the door to open position.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure 1 is a horizontal sectional view through a. hinged door and part of the door frame, showing the door check applied thereto.

Figure 2 is a detail perspective view of the torsion spring mounting and the piston rod in engagement with the door frame.

Referring to the drawing, the numeral I designates the door which swings in the direction of the arrow a towards an open position. Door I is hingedly connected to the side 2 of the door frame by a conventional spring hinge 3.

.Secured to the inner side of the door I is a U-shaped bracket 4, between the arms of which the door check cylinder is pivoted at 6. During the opening and closing of the door, the cylinder 5, hingedly moves in a horizontal plane.

Reciprocally mounted within the cylinder 5 is a piston 1 carried by a piston rod 8. The piston rod 8 is slidably mounted in the end plug 9 of the cylinder, and extends outwardly beyond said plug into engagement with the door frame 2, at I0. The engagement, at I0, is normally maintained on the initial opening of the door by means of the arm II of the U-shaped member l2, the downwardly extending arm I3 of which is rockably mounted in the ears of a U-shaped bracket I4 carried by the door frame, clearly shown in Figure 2.

Surrounding the arm I3 is a torsion spring I5, the lower end of which is anchored at I6 to S PATENT Doon CHECK u JlJ-ns,Tlllsaioklf* Application February 13, 1947, Serial No. 728,255

the bracket I4, and the upper end of the torsion spring terminates in an inwardly extending arm I1, which arm engages the arm II and urges the outer end of the piston rod 8 towards the door frame. -Upon initial movement of the door I from. its closed position, shown in Figure 1, full line, to the dotted line position, shown in Figure 1, the door moves substantially ninety degrees, and during this movement the torsion spring I5 maintains the piston rod engagement, at Ill, with the door frame. During this movement the piston has moved to a position where it will engage the inner end of the plug 9, as at I8; then as the door is further opened towards the one hundred and eighty degree position, shown at c, the piston rod will pull outwardly on the U-shaped member I2, against the action of the torsion spring. Therefore it will be seen there has been a minimum amount of movement of the piston 1 within the cylinder 5, and the torsion spring I5 will act as a door closer, assisting the spring hinge 3 on the closing operation.

The free end of the cylinder 5 is provided with an intake valve I9, and an exhaust valve 20 of conventional construction. The intake valve I9 is of the disc type and normally cooperates with an intake port I9a. Valve I9 is provided with a shaft or stem |91)A with which a helical spring I9c cooperates for normally maintaining the valve I9 in closed position. The exhaust regulation is controlled by the screw 20 having a valve end 20a, which cooperates with an exhaust port 20h.

As the door moves from the extreme open position to closed position, the piston 1 will remain in engagement with the end I8 of the plug 9 until the parts reach the ninety degree position, and following this, the outer end of the piston rod will be in engagement at I0 with the door frame, andv as the piston moves into the cylinder 5, there will be a checking of the door. It will be noted, with this arrangement, that the amount of wear on the piston will be reduced to a minimum, thereby materially increasing the life of the piston and the usual piston cups.

From the above it will be seen that a door check is provided which is simple in construction, and constructed in a, manner whereby the door can open one hundred and eighty degrees with a minimum amount of travel of the piston within the cylinder.

The invention having been set forth what is claimed as new and useful is:

A door check connection between a reciprocating piston rod carried by a door check cylinder hingedly mounted on a door for horizontal oscillation on its hinged point, the outer end of said piston rod being limited in its outward movement by engagement with one side of the door frame, said connection comprising a bracket carried by the door frame, a link connection between said bracket and the frame engaging end of the piston rod, said link connection comprising an inverted L-shaped member, onearm `of the L.shaped memberlbeing rotatably mounted in theido'or frame bracket, the other arm of said L-shaped member being hingedly connected to the outer l.;

end of the piston rod, and spring means carried by the bracket and cooperating with the arm of the L-shaped member connected tothe piston rod for normally forcing the piston rod and last named arm towards the door frame side.

JAMES J. JONES.

REFERENCES CITED The following references are of record in the file of this patent:

UNQI'IED STATES PATENTS 10 lNumb-efr- QJNamej Date 759,621 n Lackey V 10, 1904 :1].36300 Mothmillel DEC. 23, 1920 v FOREIGN PATENTS y Number Country Date 15-'' 298,890 Great Britain Nov. 1, 192s

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