|Publication number||US3820752 A|
|Publication date||28 Jun 1974|
|Filing date||14 Sep 1972|
|Priority date||16 Sep 1971|
|Also published as||DE2245764A1|
|Publication number||US 3820752 A, US 3820752A, US-A-3820752, US3820752 A, US3820752A|
|Original Assignee||Oram J|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (73), Classifications (20)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent [191 Gram [ 1 June 28, 1974 4] ADJUSTABLE ARTICULATED SUPPORT ARM  Inventor: John Anderson Oram, Osborne Cottage, Heath Rd, Leighton, England  Filed: Sept. 14, 1972 21 Appl. No.: 289,026
 Foreign Application Priority Data Sept. 16, 1971 Great Britain 43245/71  US. Cl 248/278, 240/73 B]  Int. Cl. F265 l/00, A47g 29/00  Field of Search 248/276, 278, 279, 280,
248/281, 282, 284, 286, 291, 292, 324, 325, 326, 123, 124; 240/73 B], 73 .IC, 81 BE; 32/22  References Cited UNITED STATES PATENTS 1,139,581 5/1915 Riley 248/281 1,982,954 12/1934 Globe 248/292 X 2,326,207 8/1943 Eddy 248/325 3,073,343 1/1963 Mowell et a1. 248/292 X 3,073,343 1/1963 Mowell et all. 248/325 X FOREIGN PATENTS OR APPLICATIONS 59,913 10/1925 Sweden 248/278 61,437 5/1955 France 240/81 BE 72,804 12/1916 Austria 240/81 BE Primary Examiner-J. Franklin Foss Attorney, Agent, or FirmSughrue, Rothwell, Mion, Zinn & Macpeak [5 7] ABSTRACT An adjustable, articulated support for supporting a load, such as a lamp or dentists tray, has a base and at least two arms. One arm is pivoted on the base and the second arm is pivoted to the first. A cable drum is secured to the first arm and a tensioned cable anchored at one end to the base extends at least once round the drum and passes over an arcuate guide on the second arm. To release the support for adjustment the tension is released in the cable.
16 Claims, 9 Drawing Figures PATENTEnJuuzs 1914 saw 3 M4 PATENTEU JUN 2 8 i974 SHEET '4 OF 4 ADJUSTABLE ARTICULATED SUPPORT ARM The present invention relates to an adjustable, articulated support for carrying a load such as a lamp or a dentists. tray and having a base member and two or more arms pivoted to one another and to the base member.
It is common in known supports of this kind to rely on friction-loading of the joints between the arms and between the lowermost arm and the base member in order to support the load. To adjust the support, the user manipulates the arms by applying enough force to overcome the friction in the joints.
Thus there is a conflict between the requirement for sufficient friction to support the load but not so much friction that the user is unable readily to adjust the support.
In some applications this conflict results in an unsatisfactory support. For example, where a lamp is carried by such a support on a machine in which there is vibration, if the support is such that it meets the requirement of being readily adjustable the vibration can cause the support todroop progressively.
According to the present invention in one aspect there is provided an adjustable, articulated support comprising an arm transversely pivoted at one end to a base member and an elongated flexible member anchored at one end to the base member and extending at least once round a drum secured to the arm and gripping the drum when tensioned to render the arm rigid against a load on the support and permitting articulation of the support when tension is released in the elongated flexible member.
According to the present invention in a second aspect an adjustable, articulated support comprises an elongated flexible member anchored at one end to a base member and extending firstly at least once round a drum secured to a first arm transversely pivoted at one end to the base member, and secondly over an arcuate guide member secured to a second arm pivoted to the other end of the first arm, the arrangement being such that with the elongated flexible member tensioned the flexible member grips the drum, the support is substantially rigid and a'load can be supported at the end of the support remote from the base whereas with tension released in the elongated member the arms are released for rotation about their pivots whereby the sup port can be adjusted. Thus the load is held by the elongated flexible member (hereinafter referred to as the cable) and the bite of the cable on the drum or on both the drum and the arcuate guide member which may also be a drum or pulley-like member. It is extremely well known that a ship can be held to a dockside by a rope passed once or twice around a bollard and held by a workman. The ratio of the force F in the rope between the ship and the bollard and the force F applied by the workman is the well-known ratio F /F e where ,u. is the coefficient of friction between the rope and the bollard and 6 is the angle of wrap of the rope around the bollard;Thus in the present invention bypassing the cable at least once around the drum and tensioning the cable so that it bites on the drum the support can be made substantially rigid against the applied load yet can readily be released for easy adjust- .ment by release of the tension in the cable.
The invention will now be described, by way of example, with reference to the drawings accompanying the provisional specification in which FIG. 1 is a partially cut-away elevation of an adjustable, articulated support according to the invention,
FIG. 2 is a plan of a first arm of the support,
FIG. 3 shows the arrangement of a cable in the supp FIG. 4 shows an arrangement to facilitate release of tension in the cable, and
FIG. 5 shows manually releasable clamping means for the cable,
FIG. 6 is a partially cut-away elevation of a second embodiment of the invention,
FIG. 7 shows the arrangement of a cable in the support of FIG. 6,
FIG. 8 is a partially cut-away elevation of a third embodiment, and
FIG. 9 shows the arrangement of a cable in the support of FIG. 8.
The adjustable articulated support arm shown in FIGS. 1, 2 and 3 comprises first, second and third arms l0, l1 and 12. Each of the arms 10, 11 and 12 comprises a hollow tubular portion and the arms have cylindrical drums 13, 14 or 15 respectively attached to their innerends. The cylindrical drums 13, 14 and 15 have the same diameter. t
The inner end of the first arm 10 is transversely pivoted on an outer end of a tubular base member 16 for pivotal movement about a horizontal axis coaxial with the axis of the drum 13.A pivot pin 17 extends through plates 18 attached to the sides of thefirst arm and the base member 16. The base member 16 is mounted on a base plate 19 for rotation about a vertical axis 20.
The inner ends of the second and third arms, 11 and 12 respectively, are similarly transversely pivoted on the outer ends of the preceding arms 10 and 11 respectively, for pivotal movement about axes coaxial with the respective drums l4 and 15. Pivot pins 21 and 22 respectively extending through plates 23 attached to the sides of the arms connect the first and second, and second and third arms together.
A flexible multi-strand wire cable 24 is anchored at an inner end to the inside of the base member 16 by means of a nut and bolt 25. The cable 24 extends through the hollow base member 16 and twice clockwise (as viewed in FIG. 1) around the first drum 13 attached to the first arm 10. The cable 24 then extends successively through the first arm section 10, twice clockwise around the second drum 14, through the second arm' 11 and two'and a half times around the third drum 15. The cable 24 is then guided back into the second arm 11 by a smallpulley 26 attached to the second arm adjacent its outer end.
The outer end of the cable 24 is then connected to resilient tensioning means comprising a pair of springs 27 in parallel mounted within the second arm 11. Two springs are used as a safety measure against failure of a spring by breakage. One end of the springs 27 is attached to the cable 24 and the other end to the second arm 11 adjacent the second drum 14 in such a manner as to tension the cable and make it bite on the drums. The arrangement of the cable run is shown in FIG. 3.
Means for manuallyreducing or releasing the tension can be as shown in FIG. 4. A release cable 28 attached at one end to the outer end of the cable 24 at the point where the cable 24 is connected to the springs 27 is passed back around the pulley 26 and then forwards on the outside of the second arm 11 towards the first arm 10. The other end of the release cable 28 is attached to .a thumb-piece 28 slidably mounted on the second arm 11. A fixed finger-piece 30 is mounted on the second arm 11 between the thumb-piece 29 and the second drum 14. Thus moving the thumb-piece 29 towards the finger piece 30 stretches the springs 27 and releases the tension in the cable 24 beyond the third drum 15.
Normally the tension exerted by the springs 27 cause the cable 24 to grip or bite on the three drums frictionally. When the third arm section 12 is loaded at its outer end, by for example, a load 31, the moment of the load 31 and the arm section 12 about the pivot 22 causes the cable 28 to bite even more on the third drum 15, increasing the tension in the cable between the second and third drum 14 and 15, until the moment of the tension balances that of the load '31. Similarly, the tension between the first and second drums 12 and 13 and between the anchor nut and bolt 25 and the first drum 13 is successively increased as the cable 24 bites on the drums. The arms 10, 11 and 12 are thus maintained in position.
When the angular positions of the arms are to be adjusted, the tension in the cable 24 must be at least somewhat released so that the cable 24 can slide over the drums 13, 14 and 15. Thus, by supporting the load 31, and releasing the tension due to the springs 27, the arms may be adjusted in position. When in the new desired positions, the cable 24 can be tensioned by the springs 27, which will permit changes in the length of cable 24 between the anchor nut and bolt 25 and the third drum 15 produced by the adjustment, and the load released. The cable tension will maintain the new position of the arms.
It is possible to make use of constant angularity of the arm 12 relative to the base member whereby for example a lamp attached to the third arm 12 can be made to shine in a constant direction or a tray remain level despite variations in the height of the lamp or tray.
In order to ensure positively this constant angularity, the third arm 12 can be equipped with clamping means for releasably clamping the cable 24 to the third drum 15 as shown in FIG. 5. The clamping means comprise a thumb screw 32 on the third arm 12 for urging a friction pad 33 against the drum 15 to clamp the cable. The friction pad is attached to one end of a lever 34. The other end of the lever 34 is pivotally mounted on the third arm 12.
Referring now to FIGS. 6 and 7, these show a second embodiment of simpler form. In this embodiment and the first like parts are given the same reference. It will be seen that there are only two arms 10 and 11, the arm 10 being transversely pivoted as before to the base member 16 by means of the pivot pin 17 extending through the base member 16 and plates 18.
The arm 11 is again pivoted to the outer end of the arm 10 by a pivot pin 21 extending through the arm 11 and plates 23 on the arm 10.
A dentists tray 35 is secured to the arm 11 as shown and in this embodiment the multi-steel cable 24 is anchored by the bolt 25 to the base, extends twice around the drum 13 on the darm l0, partially around an arcuate guide member also in the form of a drum or pulleylike member 14 fixedto the arm 11, and is finally anchored at 36 on the tray 35. FIG. 7 shows more clearly the arrangement of the cable 24.
In addition there is provided a rigid link 37 pivoted at one end to the member 14 by means of a pivot pin 38, and at the other end to the base member 16 by means of a pivot pin 39. The hole in at least one and preferably both of the members 14 and 16 through which the pivot pins extend is somewhat oversize to permit some degree of lost motion.
When in use, the arm 11 and tray 35 tend to rotate clockwise (in FIG. 6) whereby the cable 24 is tensioned and grips the drum 13. The support is then rigid against the load. The length of the cable is made such that the tray 35 is horizontal as shown and the link 37 is not supporting any of the load.
In order to adjust the support the tray 35 is merely tilted slightly anti-clockwise, the lost motion in the pivots of the link permitting this through a small angle sufficient to release tension in the cable whereby the arm 10 can be pivoted up or down on the pivot pin 17. At the same time the arm 11 pivots on the pivot pin 21 correspondingly and maintains the tray 35 in a horizontal attitude.
FIGS. 8 and 9 show a modification of the embodiment of FIGS. 6 and 7 in which the link 37 of FIG. 6 is removed and in its place the cable 24 is taken around half the drum 14, partially around the drum l3 and is anchored to the base member 16 through a strong spring 40. The tension in the spring adds to the pull of gravity provided by the tray and tensions the cable even further. A clamp 41 is provided .at the drum 14 to clamp the cable firmly to this drum.
In order to release the tension in the cable for enabling the support to be adjusted, the tray 35 is merely lifted against the tension in the spring 40 whereby the grip on the drum 13 is then released and articulation of the support can then be effected.
1. An adjustable, articulated support, comprising a base member, a first arm transversely pivoted to the base member, a drum secured to the first arm, a second arm pivoted to the first arm, an arcuate guide member secured to the second arm, and an elongated flexible member anchored at one end to the base member and extending at least once around said drum and passing over said arcuate guide member to hold said support rigid against an applied load by tension in the elongated member and grip thereof on said drum, adjustment on the support being permitted by releasing the tension in said elongated flexible member, the end of said elongated flexible member remote from said anchorage on the base member being anchored to said second arm or to a further member secured to said second arm and the tensioning of the elongated flexible member being achieved by the action of gravity on the second arm plus any load carried thereby.
2. A support according to claim 1, and including a rigid link pivoted at one end to said second arm and at the other end to said base member, at least one of the Y pivots providing for a degree of lost motion permitting the tension in said elongated member to be released when adjustment of the support is required.
3. A support according to claim 1, wherein the radii of curvature of the guide member and the drum are substantially equal.
4. A support according to claim 3, wherein the axes of curvature of the drum and the guide member respectively substantially coincide with the axes of the pivots of the first arm on the base member and the second arm on the first arm.
5. A support according to claim 1 wherein the arcuate guide is of pulley-like form.
6. A support according to claim 1, and including a third arm transversely pivoted to the end of said second arm remote from said first arm, said arcuate guide member being constituted by a second drum around which said elongated member extends at least once, and said third arm having a second arcuate guide member secured thereto over which the elongated member passes.
7. A support according to claim 6, wherein the radii of curvature of the first and second drums and the arcuate guide member on the third arm are substantially equal.
8. A support according to claim 7, wherein the axes of the first and second drums and the arcuate guide member on the third arm substantially coincide respectively with the axes of the pivots between the first arm and the base member, the second arm and the first arm and the third arm and the second arm.
9. A support according to claim 6, wherein the end of the elongated flexible member remote from the base member is anchored to the second arm through a tensioning spring.
10. A support according to claim 6, wherein means are provided for clamping the elongated flexible member to the second arcuate guide member.
11. A support according to claim 6, wherein the second arcuate guide member is in the form of a drum and the elongated flexible member passes at least once around the last said drum.
12. A support according to claim 9, wherein means are provided to facilitate the release of tension in the elongated flexible member.
13. A support according to claim 1, wherein the elongated flexible member is a multi-strand steel cable.
14. An adjustable, articulated support, comprising a base member, a first arm transversely pivoted to the base member, a drum secured to the first arm, a second arm pivoted to the first arm, an arcuate guide member secured to the second arm, and an elongated flexible member anchored at one end to the base member and extending at least once around said drum and passing over said arcuate guide member to hold said support rigid against an applied load by tension in the elongated member and grip thereof on said drum, adjustment of the support being permitted by releasing the tension in said elongated flexible member, the end of said elongated flexible member remote from the anchorage on the base being itself anchored to the base through a tensioning spring whichassists gravity in tensioning the elongated flexible member, and means for clamping said elongated flexible member to the arcuate guide member whereby tension in that part of the elongated flexible member which extends back from the guide member and around said drum to the first said anchorage can be released by rotation of the second arm about its pivot to permit adjustment of the support.
15. An adjustable, articulated support, comprising: a base member, a first arm transversely pivoted to the base member, a drum secured to the first arm, a second arm pivoted to the first arm, an arcuate guide member secured to the second arm, and an elongated flexible member anchored at one end to the base member and extending at least once around said drum and passing over said arcuate guide member to hold said support rigid against an applied load by tension in the elongated member and grip thereof on said drum, adjustment of the support being permitted by releasing the tension in said elongated flexible member, the tensioning of the elongated member between the anchorage and the drum and between the drum and the arcuate guide member being effected at least in part by gravity acting on the arms.
16. A support according to claim 15, wherein the tensioning of the elongated member beyond the arcuate guide member is effected by means of a spring.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3933329 *||10 Jan 1974||20 Jan 1976||Maurice Granger||Support apparatus for a portable shower head|
|US4139883 *||8 Jun 1977||13 Feb 1979||Original Hanau Quarzlampen Gmbh||Rotary joint, particularly to suspend heavy metal weights from a ceiling, such as an operating room light|
|US4314319 *||12 Jul 1979||2 Feb 1982||John Victor Terry||Adjustable lamps|
|US4494177 *||20 Apr 1983||15 Jan 1985||Plan Hold Corp.||Articulated task lamp|
|US4545555 *||2 Jul 1984||8 Oct 1985||Koch Mark B||Adjustable arm member for use with a lamp or the like|
|US4744019 *||12 Sep 1986||10 May 1988||Jac Jacobsen A/S||Counterbalanced arm assembly|
|US5527217 *||3 Apr 1995||18 Jun 1996||Ab Ph. Nederman & Co.||Adjustable device for exhaustion and/or supply of gas|
|US5538214 *||27 Jul 1994||23 Jul 1996||Sinila; Alexander||Locking accessory support apparatus|
|US5609316 *||5 Sep 1995||11 Mar 1997||Tigliev; George S.||Suspension system for surgical microscope|
|US5765797 *||12 Dec 1995||16 Jun 1998||Greene; H. Peter||Articulated support for computers and the like|
|US5826846 *||28 Jun 1996||27 Oct 1998||Hill-Rom, Inc.||Monitor arm with constant counterbalance|
|US5836560 *||22 Nov 1995||17 Nov 1998||Steelcase Inc.||Articulated keyboard shelf|
|US5975474 *||29 May 1998||2 Nov 1999||Steelcase Inc.||Articulated keyboard shelf|
|US6012821 *||30 Mar 1998||11 Jan 2000||Hill-Rom, Inc.||Support arm for surgical light apparatus|
|US6062148 *||31 Jul 1998||16 May 2000||Steelcase Development Inc.||Height adjustable support for computer equipment and the like|
|US6098935 *||25 Mar 1999||8 Aug 2000||Steelcase Development Inc.||Articulated keyboard shelf|
|US6135405 *||9 Jan 1998||24 Oct 2000||Steelcase Development Inc.||Tilt lockout for articulated keyboard supports|
|US6328458||11 Jan 2000||11 Dec 2001||Hill-Rom Services, Inc.||Support arm for surgical light apparatus|
|US6343775||13 Sep 2000||5 Feb 2002||Steelcase Development Corporation||Keyboard support with quick connect|
|US6378829||20 May 1998||30 Apr 2002||Straeter Fritz||Articulated bracket for office equipment|
|US6480613 *||27 Dec 1999||12 Nov 2002||Tony Tzi Chan Choi||Loudspeaker stand|
|US7065811||17 Mar 2004||27 Jun 2006||Hill-Rom Services, Inc.||Radial arm system for patient care equipment|
|US7097145||14 Sep 2001||29 Aug 2006||Hill-Rom Services, Inc.||Support arm for a surgical theater system|
|US7254850||6 Jun 2006||14 Aug 2007||Hill-Rom Services, Inc.||Radial arm system for patient care equipment|
|US7289315 *||19 Dec 2003||30 Oct 2007||Apple Inc.||Computer controlled display device|
|US7338019 *||4 Aug 2004||4 Mar 2008||Hon Hai Precision Ind. Co., Ltd.||Adjusting assembly for LCD monitor|
|US7478786 *||20 Feb 2004||20 Jan 2009||Knoll, Inc.||Mechanical arm with spring counterbalance|
|US7673838||9 Mar 2010||Innovative Office Products, Inc.||Quick release assembly for an electronic device|
|US7731137 *||6 Sep 2007||8 Jun 2010||Jarllytec Co., Ltd.||Vertically adjustable supporting structure|
|US7837674||23 Nov 2010||Intuitive Surgical Operations, Inc.||Compact counter balance for robotic surgical systems|
|US7921489||28 Jun 2007||12 Apr 2011||Hill-Rom Services, Inc.||Radial arm system for patient care equipment|
|US8051610||8 Nov 2011||Hill-Rom Services, Inc.||Patient flatwall system|
|US8220765||17 Jul 2012||Intuitive Surgical Operations, Inc.||Spring counterbalance for rotating load|
|US8336138||18 Mar 2011||25 Dec 2012||Hill-Rom Services, Inc.||Radial arm system for patient care equipment|
|US8500722||14 Oct 2010||6 Aug 2013||Intuitive Surgical Operations, Inc.||Methods for compact counter balance arms|
|US8570723 *||24 Jun 2011||29 Oct 2013||Myerchin Enterprises, Inc.||Actuated hinge and cable assembly for use with computer display monitors|
|US8576553 *||17 May 2011||5 Nov 2013||Myerchin Enterprises, Inc.||Base with counterweight for display screens|
|US8607935 *||30 Mar 2006||17 Dec 2013||Intuitive Surgical Operations, Inc.||Guide systems for laminated spring assemblies|
|US8678334||1 Nov 2011||25 Mar 2014||Hill-Rom Services, Inc.||Patient flatwall system|
|US8720838||9 Jun 2011||13 May 2014||Innovative Office Products, Llc||Articulating monitor arm with chain and spring|
|US8794579||2 Jun 2006||5 Aug 2014||Steelcase, Inc.||Support arm assembly|
|US8808278||12 Jul 2011||19 Aug 2014||Intuitive Surgical Operations, Inc.||Patient side systems with a counterbalance subsystem|
|US8834489||11 Jul 2012||16 Sep 2014||Intuitive Surgical Operations, Inc.||Modular manipulator support for robotic surgery|
|US8931748 *||9 Jun 2010||13 Jan 2015||Innovative Office Products, Llc||Articulating monitor arm with cable and spring|
|US9023060||6 Dec 2012||5 May 2015||Intuitive Surgical Operations, Inc.||Modular manipulator support for robotic surgery|
|US9149937||12 Nov 2013||6 Oct 2015||Intuitive Surgical Operations Inc.||Passive guide systems for laminated spring assemblies|
|US9291793||14 Oct 2010||22 Mar 2016||Intuitive Surgical Operations, Inc.||Apparatus for compact counter balance arms|
|US9399300||31 Aug 2015||26 Jul 2016||Intuitive Surgical Operations, Inc.||Guide systems including a guide wall for laminated spring assemblies|
|US20040164213 *||20 Feb 2004||26 Aug 2004||Copeland Stephan||Mechanical arm with spring counterbalance|
|US20040188578 *||14 Sep 2001||30 Sep 2004||Turner Jonathan D||Support arm for a surgical theater system|
|US20040199996 *||17 Mar 2004||14 Oct 2004||Newkirk David C.||Radial arm system for patient care equipment|
|US20050029424 *||4 Aug 2004||10 Feb 2005||Liu Alvin (Chien-Chung)||Adjusting assembly for LCD monitor|
|US20060073713 *||23 Aug 2005||6 Apr 2006||Chance Richard W||Patient flatwall system|
|US20060176655 *||19 Dec 2003||10 Aug 2006||Hillman Michael D||Computer controlled display device|
|US20060181637 *||16 Feb 2005||17 Aug 2006||Innovative Office Products, Inc.||Quick release assembly for an electronic device|
|US20060231710 *||19 Apr 2005||19 Oct 2006||Yuan-Hsiang Huang||Flat display holder arm|
|US20070019403 *||19 Jul 2005||25 Jan 2007||Boghossian Hratch P||Portable lighting apparatus|
|US20070142701 *||30 Mar 2006||21 Jun 2007||Intuitive Surgical Inc.||Guide systems for laminated spring assemblies|
|US20070156122 *||26 Jan 2007||5 Jul 2007||Cooper Thomas G||Compact counter balance for robotic surgical systems|
|US20080277555 *||6 Sep 2007||13 Nov 2008||Jarllytec Co., Ltd.||Vertically adjustable supporting structure|
|US20090314131 *||24 Dec 2009||Intuitive Surgical, Inc.||Spring Counterbalance for Rotating Load|
|US20100008854 *||11 Jul 2008||14 Jan 2010||Seung Joo Haam||Metal nanocomposite, preparation method and use thereof|
|US20110023285 *||3 Feb 2011||Intuitive Surgical Operations, Inc.||Methods for compact counter balance arms|
|US20110023651 *||3 Feb 2011||Intuitive Surgical Operations, Inc.||Apparatus for compact counter balance arms|
|US20120175476 *||13 Apr 2007||12 Jul 2012||Colebrook Bosson Saunders Products Ltd.||Monitor support arm|
|US20120267497 *||9 Jun 2010||25 Oct 2012||Innovative Office Products, Inc.||Articulating monitor arm with cable and spring|
|US20120293937 *||22 Nov 2012||Myerchin Enterprises, Inc.||Actuated hinge and cable assembly for use with computer display monitors|
|US20120293941 *||22 Nov 2012||Merchin Enterprises, Inc.||Base with counterweight for display screens|
|US20160131305 *||22 Jul 2015||12 May 2016||Jeannie Trinh||X-tra arm item holder|
|DE10235343B4 *||2 Aug 2002||19 Aug 2010||Ondal Holding Gmbh||Tragarm|
|EP1207335A1 *||26 Oct 2001||22 May 2002||Leica Microsystems AG||Stand|
|WO1998053243A1 *||20 May 1998||26 Nov 1998||Straeter Fritz||Articulated bracket for office equipment|
|WO2004076130A3 *||20 Feb 2004||17 Mar 2005||Stephan Copeland||Mechanical arm with spring counterbalance|
|U.S. Classification||248/284.1, 362/427|
|International Classification||F16M11/20, F16M11/02, F21V21/26, F16M11/04, F16M11/38, F21V21/14|
|Cooperative Classification||F16M11/048, F16M2200/022, F16M2200/065, F16M11/04, F16M2200/063, F21V21/26, F16M11/046, F16M2200/041|
|European Classification||F16M11/04T3, F16M11/04T2, F16M11/04, F21V21/26|