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Vertically adjustable counterbalancing x-ray tube head suspension support apparatus

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Publication number
US3575368A
US3575368A US3575368DA US3575368A US 3575368 A US3575368 A US 3575368A US 3575368D A US3575368D A US 3575368DA US 3575368 A US3575368 A US 3575368A
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Grant
Patent type
Prior art keywords
spring
carriage
member
column
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
Eugene P Thomas
Wiliam E M Jones
Bernard Miller
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/44Constructional features of the device for radiation diagnosis
    • A61B6/4429Constructional features of the device for radiation diagnosis related to the mounting of source units and detector units
    • A61B6/447Constructional features of the device for radiation diagnosis related to the mounting of source units and detector units the source unit or the detector unit being mounted to counterpoise or springs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B17/00Hoistway equipment
    • B66B17/12Counterpoises
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS, OR BEDS OF ENGINES OR OTHER MACHINES OR APPARATUS NOT SPECIFIC TO AN ENGINE, MACHINE, OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS OR SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/04Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/043Allowing translations
    • F16M11/046Allowing translations adapted to upward-downward translation movement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS, OR BEDS OF ENGINES OR OTHER MACHINES OR APPARATUS NOT SPECIFIC TO AN ENGINE, MACHINE, OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS OR SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/42Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters with arrangement for propelling the support stands on wheels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS, OR BEDS OF ENGINES OR OTHER MACHINES OR APPARATUS NOT SPECIFIC TO AN ENGINE, MACHINE, OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS OR SUPPORTS
    • F16M2200/00Details of stands or supports
    • F16M2200/04Balancing means
    • F16M2200/047Balancing means for balancing translational movement of the head

Abstract

Described is a vertically adjustable counterbalancing suspension support apparatus embodied in a floor mounted mobile X-ray tube column. The exemplified load, an X-ray tube head, is mounted on a vertical carriage movable along a mobile-based column containing an elongated circumferentially-encased helical compression spring extending vertically therein for counterbalancing the tube head and carriage. A dual suspension cable arrangement transmits the carriage load to the lower and live end of the compression spring via respective spring-pickup-compensating fusees at the top of the column and a pair of spring-travel-reducing pulley arrangements at such live end. A combined tension-equalizing-andsafety-lock member connects the support cables to the loaded carriage.

Description

United States Patent Inventors Eugene P. Thomas Baltimore, Md.; William E. M. Jones; Bernard Miller, Pittsburgh, Pa.

Appl. No. 794,204

Filed Jan. 27, 1969 Patented Apr. 20, 1971 Assignee Westinghouse Electric Corporation Pittsburgh, Pa.

VERTICALLY ADJUSTABLE COUNTERBALANCING X-RAY TUBE HEAD SUSPENSION SUPPORT APPARATUS 8/1939 Haupt 248/123 5/1949 Berggren... 248/123 5/1950 Lofstrand 248/123 3/1959 Foderaro 248/334 8/1959 Stava et al. 248/123 FORElGN PATENTS 6/1942 France 248/123 Primary ExaminerMarion Parsons, Jr. Attorneys-F. H. Henson, D. F. Straitiff and E. P. Klipfel ABSTRACT:

Described is a vertically adjustable counterbalancing suspension support apparatus embodied in a floor mounted mobile X-ray tube column. The exemplified load, an X-ray tube head, is mounted on a vertical carriage movable along a mobile-based column containing an elongated circumfcrentially-encased helical compression spring extending vertically therein for counterbalancing the tube head and carriage. A dual suspension cable arrangement transmits the carriage load to the lower and live end of the compression spring via respective spring-pickupcompensating fusees at the top of the column and a pair of spring-travel-reducing pulley arrangements at such live end. A combined connects the support cables to the loaded carriage.

tension-equalizing-and-safety-lock member Patented; :April 20, 1971 3,575,368

WITNESSES INVENTORS Eugene P. Thomas, William EM. Jones, 4 and Bernard Miller.

VIEIIT'I'ICAIJLY AIIMIUS'II'AELIE COUNTEREALANCING X- IIIAY TIIIIIE MEAD SUSPENSION SUPPORT APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention:

Vertically adjustable counterbalancing suspension support apparatus for devices, instruments, or the like, such as X-ray tube heads, mounted for guided travel vertically.

2. Description of the Prior Art:

Vertically adjustable counterbalancing suspension support apparatus employing flexible suspension cables for support of relatively heavy items such as X-ray tube heads mounted on vertical columns often are characterized by considerable bulk, complexity, and/or weight resultant from the nature of the construction of such apparatus under requirement for a high degree of assurance against failure of the apparatus to maintain support of the load over a prolonged period of time.

SUMMARY The present invention, is suspending the vertically adjustable load-bearing carriage or mounting means by a pair of cables, either of which alone is capable of supporting such loaded carriage, together with inclusion of a safety lock for the carriage which is effectuated responsively to loss of support by either cable, fail-safe operation of the support apparatus with respect to suspension cable failure is assured. By virtue of employment of a single elongated helical compression spring in conjunction with fusees for counterbalancing the loadbearing carriage, the weight of the apparatus can be made significantly less than where a counterweight means is employed. By virtue of circumferential encasement of the compression spring, its reliability is assured against separation at any of its turns and a degree of simplicity relative to use of a plurality of parallel-arranged tension springs is afforded. And, by virtue of connecting the cables to the live end of the compression spring via jockey pulleys, the travel required for spring compression is one-half that of the load-bearing carriage, thus affording use of a relatively short spring and thereby contributing to a saving in space requirement for such spring.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a side elevation view, partly in outline and partly in section, of a floormounted mobile X-ray column embodying the invention;

FIG. 2 is a front elevation view of the portion of the apparatus within the dot-dash circle A in FIG. ll;

FIG. II is a front elevation view of the portion of the apparatus within the dot-dash circle B in FIG. I; and

FIG. I is a front elevation view of the portion of the apparatus within the circle C in FIG. I.

DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment of the invention is exemplified in conjunction with a floor mounted mobile Xray column 5 projecting vertically from a wheel-supported base 7, as shown in FIG. I. The column 5 is constructed of metal, is hollow, and of generally rectangular cross section, with oppositely-facing guide channels 9 formed therein which extend along its length for directing vertical movement of a tube head carriage 112 via carriage rollers Ml disposed in such channels. For suspension support of the carriage I2, one end of a spaced-apart pair of flexible plastic-covered aircraft cables 116 about one-eighth inch in diameter, only one of which is shown in FIG. I, are anchored to the tube head carriage I2 via a combined tensionequalizing and safety lock member lb extending between the guide channels, as shown in FIG. 2. These support cables I6 in turn extend upwardly along the carriage guide channels 9, across respective relatively wide cable guide pulleys on the column 5 onto the spiral grooves of respective fusees 22. thence around multigrooved drums 24 affixed to the fusees, thence downwardly within the column around a pair of respective jockey pulleys 26 coupled to a lower and live end of a helical compression spring 28 within the column, and then upwardly through such spring to cable anchors 30 at the top of the column.

The compression spring 28 is cylindrical and encased about its periphery in a hollow tubular spring housing member 32 attached at its lower end to the wheel-supported base 7 at the bottom of the column 5. An inwardly-extending annular stop member 34 affixed to the upper end of the spring housing member 32 forms a shoulder against which the upper end of the compression spring 28 abuts, and the outer periphery of such spring is in slidable engagement with the inner surface of such housing member.

Referring to FIGS. l and 4, jockey pulleys 26 are rotatably carried between the arms 36 of a clevis 38 on a common shaft III, and the clevis has a thrust transmitting rotary connection with the upper end of a threaded spring adjustment screw 42 via a swivel member 44. The adjustment screw in turn extends centrally through and is in screw-threaded connection with a disc-shaped thrust member 46 which abuts the lower end of the compression spring 28.

In normal operation of the apparatus, in any given vertical position of the carriage 12, the degree of compression of the spring 28 commensurate with such position creates a tension in the cables I6 which is transmitted to the carriage via the drums 24 and fusees 22 adequate to suspend such carriage and its tube head 50 load. As the tube head carriage 12 is moved downwardly, the cables 16 will unwind from the fusees 22 and leave same at progressively decreasing diameter portions of the spiralling fusee grooves as the cables wind upwardly onto the drums 24 and pull the lower end of the compression spring 28 upwardly via the jockey pulleys 26 an amount equal to onehalf the downward travel of the carriage. Such increased longitudinal compaction of the spring 28 increases tension of the cable portions passing around the pulleys 26 and winding onto the drums 24. Such increased tension, however, in accord with the well-known characteristics of fusees, is compensated for by the fusees 22 which maintain tension of the cables playing out from such fusees constant and collectively equal to the load imposed thereon by the carriage I2 and its load 50. When the tube head carriage 12 is moved upwardly, the cables I6 will wind onto progressively larger diameter portions of the fusees 22 as a result of the compression spring 28 unwinding the cables 16 from the drums 24 attached to such fusees, and the resultant diminished spring force is compensated for by the fusees to maintain the counterbalancing support of the tube head carriage l2, and its load 50. It will be understood that the fusees 22 and the drums 24 attached thereto are so constructed and arranged as to accept storage of the cable lengths necessary to accommodate vertical travel of the carriage I2 for substantially the entire length of the column 5, and that the cables I6 are suitably secured against slippage on the fusees and drums.

In accord with a feature of the invention, the combined tension-equalizing and safety lock member 18 via which the cables I6 are connected to the tube head carriage I2 is simply in the form of a substantially flat metal plate, FIG. 2, which is pivotally connected at 52 near its top edge midway between its ends which are tapered downwardly, as viewed in the drawing, to relatively sharp edges 54 that are disposed with slight clearance adjacent to the sidewalls 56 of the carriage guide channels 9 at the forward edges of the column 5. During normal operation of the apparatus, with both cables I6 intact, the member llfl is free to tilt slightly about its pivotal connection 52 with the carriage 12 in the presence of a moderate degree of difference in cable lengths which are anchored to such member equal distances at opposite sides of such pivotal connection. However, the member 18 is so proportioned that the distance from the pivotal connection 52 to either sharp edge 54 is greater than the distance from such pivotal connection to either guide channel wall 56, so that upon separation of one of the cables 16, the torque reaction between the horizontally constrained vertically movable pivotal connection 52 and the nonscparated one of the cables causes the member 18 to turn about such connection and bring the corresponding sharp edge 54 of the member into locking engagement with the respective guide channel wall 56 and prevent the carriage l2 and its load 50 from being lowered, even though the remaining intact cable is capable of alone supporting the load and affording opportunity for raising the carriage. Such lockout against downward movement serves as indication of the existence of a faulty cable in a manner that requires attention before the apparatus can be operated in a useful manner.

We claim:

1. A vertically adjustable counterbalancing X-ray tube head suspension support apparatus, comprising:

an X-ray tube head to be positioned selectively at different elevations;

a floor-mounted hollow vertical column of rectangular cross section having oppositely facing horizontally spacedapart exterior guide channels extending lengthwise along its one rectangular side at respective edges thereof;

a vertical carriage supporting said X-ray tube head and having rollers thereon in rolling contact with said guide channels;

a pair of fusees and respective attached drums disposed within said column near its top for rotation about fixed horizontal axes;

a tubular spring housing member fixed relative to said column and extending upwardly therewithin;

an inwardly extending stop member affixed to the upper end of said spring housing member;

an elongated helical compression spring disposed in said spring housing member with its upper end abutting said stop member;

a pair of pulleys disposed within said helical compression spring in upwardly exerting thrust-transmitting connection to its lower end;

a pair of parallel-arranged flexible cables anchored at their one end to said column above said spring housing member, extending downwardly therefrom to and around said pulleys, thence upwardly to and around the respective drums and fusees in continuously wound relationship, thence downwardly to said carriage; and

an elongated horizontal rockable member extending laterally between said guide channels, having opposite pointed ends normally disposed in proximity to walls of said guide channels extending perpendicular of said member, pivotal suspended connections with said cables at opposite sides of its mid length, and a laterally constrained pivotal support connection with said carriage at a location separated from such pointed ends a distance greater than the mid distance between such perpendicular guide channel walls.

Claims (1)

1. A vertically adjustable counterbalancing X-ray tube head suspension support apparatus, comprising: an X-ray tube head to be positioned selectively at different elevations; a floor-mounted hollow vertical column of rectangular cross section having oppositely facing horizontally spaced-apart exterior guide channels extending lengthwise along its one rectangular side at respective edges thereof; a vertical carriage supporting said X-ray tube head and having rollers thereon in rolling contact with said guide channels; a pair of fusees and respective attached drums disposed within said column near its top for rotation about fixed horizontal axes; a tubular spring housing member fixed relative to said column and extending upwardly therewithin; an inwardly extending stop member affixed to the upper end of said spring housing member; an elongated helical compression spring disposed in said spring housing member with its upper end abutting said stop member; a pair of pulleys disposed within said helical compression spring in upwardly exerting thrust-transmitting connection to its lower end; a pair of parallel-arranged flexible cables anchored at their one end to said column above said spring housing member, extending downwardly therefrom to and around said pulleys, thence upwardly to and around the respective drums and fusees in continuously wound relationship, thence downwardly to said carriage; and an elongated horizontal rockable member extending laterally between said guide channels, having opposite pointed ends normally disposed in proximity to walls of said guide channels extending perpendicular of said member, pivotal suspended connections with said cables at opposite sides of its mid length, and a laterally constrained pivotal support coNnection with said carriage at a location separated from such pointed ends a distance greater than the mid distance between such perpendicular guide channel walls.
US3575368A 1969-01-27 1969-01-27 Vertically adjustable counterbalancing x-ray tube head suspension support apparatus Expired - Lifetime US3575368A (en)

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Cited By (48)

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US3895770A (en) * 1972-07-15 1975-07-22 Olympus Optical Co Weight balancing mechanism for use in precision elevating and lowering means
EP0199079A1 (en) 1985-04-01 1986-10-29 Siemens Aktiengesellschaft Device for adjusting the height of a support for a medical apparatus on a vertical stand
EP0203291A1 (en) * 1985-04-01 1986-12-03 Siemens Aktiengesellschaft Dental X-ray equipment
US4685648A (en) * 1985-05-17 1987-08-11 Bausch & Lomb Incorporated Counterbalancing apparatus for use in an optical instrument
US4943020A (en) * 1987-09-17 1990-07-24 Schlumberger Technologies, Inc. Manipulator apparatus
US4953256A (en) * 1989-02-06 1990-09-04 Raytheon Company Counterbalance mechanism
US5033710A (en) * 1990-06-05 1991-07-23 Michael Antoniadis Apparatus for holding and operating a hand-held tool
US5037059A (en) * 1988-06-17 1991-08-06 Kabushiki Kaisha Toshiba X-ray diagnostic device with safe and durable X-ray tube suspension mechanism
US5114109A (en) * 1990-10-02 1992-05-19 Htg High Tech Geratebau Gmbh Telescopically extensible lifting column, in particular for the height adjustment of a camera
FR2716613A1 (en) * 1993-11-26 1995-09-01 Thermotrex Corp Mobile X=ray appts for hospitals nursing homes etc
US6382436B1 (en) * 2000-09-28 2002-05-07 Wen-Tsan Wang Display rack
US20040035989A1 (en) * 2002-08-21 2004-02-26 Sweere Harry C. Stand
US6766996B1 (en) * 2001-07-16 2004-07-27 Reid-Ashman Manufacturing, Inc. Manipulator
US20040245419A1 (en) * 2003-01-17 2004-12-09 Sweere Harry C. Support arm
US20040250635A1 (en) * 2003-05-20 2004-12-16 Sweere Harry C. Lift mechanism based on torque equalization principles
US20050034547A1 (en) * 2003-08-01 2005-02-17 Sweere Harry C. Mechanisms based on torque equalization principles
US20050139734A1 (en) * 2000-11-28 2005-06-30 Constant Force Technology, Llc Monitor support system
US20050145762A1 (en) * 2000-11-28 2005-07-07 Constant Force Technology, Llc Methods and apparatus for generating force and torque
WO2006036889A2 (en) * 2004-09-28 2006-04-06 Ergotron, Inc. Lift mechanism systems and methods
US20060118680A1 (en) * 2004-12-07 2006-06-08 Benq Corporation Display stand
US20060124819A1 (en) * 2004-12-10 2006-06-15 Gemmy Industries Corporation Adjustable trunk for an artificial Christmas tree
US20060130713A1 (en) * 2004-12-17 2006-06-22 Steelcase Development Corporation Load compensator for height adjustable table
US20060185563A1 (en) * 2004-07-30 2006-08-24 Sweere Harry C Lift mechanism systems and methods
US20070137535A1 (en) * 2005-12-16 2007-06-21 Steelcase Development Corporation Load compensator for height adjustable table
US20080026892A1 (en) * 2006-07-26 2008-01-31 Ergotron, Inc. Balanced moment lift system and method
US20080250989A1 (en) * 2007-01-26 2008-10-16 Rubbermaid Incorporated Workstation
US20090179121A1 (en) * 2006-05-04 2009-07-16 Ergotron, Inc. Stand system and method
US20090230261A1 (en) * 2008-03-11 2009-09-17 Qisada Corporation Height Adjustable Holding Apparatus
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US20110083510A1 (en) * 2009-10-08 2011-04-14 Quanta Computer Inc. Vibration wave output instrument and method of using the same
US20120112035A1 (en) * 2010-11-09 2012-05-10 Tever Technik Vertriebs-und Beteiligungs-GmbH & Co. Beratungs KG Height-Adjustable Pedestal
US20120248273A1 (en) * 2011-03-29 2012-10-04 David Singer Mounting system with adjustable height and load carrying surface
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EP2597993A1 (en) * 2010-07-30 2013-06-05 Ergotron, Inc. Display positioning apparatus and method
WO2013148352A1 (en) * 2012-03-30 2013-10-03 Ergotron, Inc. Counterbalancing lift mechanisms and methods
US20140077050A1 (en) * 2012-09-17 2014-03-20 Ming-Hsien Huang Lifting device
WO2014098571A1 (en) * 2012-12-21 2014-06-26 Type22 B.V. Balanced support device
EP2787269A1 (en) * 2012-12-10 2014-10-08 Instytut Technologii Eksploatacji Sounding pipes rack for recovery ventilation systems
US8925154B2 (en) 2003-05-20 2015-01-06 Ergotron, Inc. Pivot mechanism for adjusting a position of an electronic display
CN104565702A (en) * 2014-12-16 2015-04-29 河南中光学集团有限公司 Height and direction adjustment mechanism for small instrument
US9038549B1 (en) 2012-06-01 2015-05-26 Humanscale Corporation Height adjustable table
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Cited By (98)

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US3895770A (en) * 1972-07-15 1975-07-22 Olympus Optical Co Weight balancing mechanism for use in precision elevating and lowering means
EP0199079A1 (en) 1985-04-01 1986-10-29 Siemens Aktiengesellschaft Device for adjusting the height of a support for a medical apparatus on a vertical stand
EP0203291A1 (en) * 1985-04-01 1986-12-03 Siemens Aktiengesellschaft Dental X-ray equipment
US4802198A (en) * 1985-04-01 1989-01-31 Siemens Aktiengesellschaft X-ray equipment support apparatus
US4807272A (en) * 1985-04-01 1989-02-21 Siemens Aktiengesellschaft X-ray equipment support apparatus
US4685648A (en) * 1985-05-17 1987-08-11 Bausch & Lomb Incorporated Counterbalancing apparatus for use in an optical instrument
US4943020A (en) * 1987-09-17 1990-07-24 Schlumberger Technologies, Inc. Manipulator apparatus
US4973015A (en) * 1987-09-17 1990-11-27 Schlumberger Technologies, Inc. Manipulator apparatus for test head support and orientation
US5037059A (en) * 1988-06-17 1991-08-06 Kabushiki Kaisha Toshiba X-ray diagnostic device with safe and durable X-ray tube suspension mechanism
US4953256A (en) * 1989-02-06 1990-09-04 Raytheon Company Counterbalance mechanism
US5033710A (en) * 1990-06-05 1991-07-23 Michael Antoniadis Apparatus for holding and operating a hand-held tool
US5114109A (en) * 1990-10-02 1992-05-19 Htg High Tech Geratebau Gmbh Telescopically extensible lifting column, in particular for the height adjustment of a camera
FR2716613A1 (en) * 1993-11-26 1995-09-01 Thermotrex Corp Mobile X=ray appts for hospitals nursing homes etc
US6382436B1 (en) * 2000-09-28 2002-05-07 Wen-Tsan Wang Display rack
US20050145762A1 (en) * 2000-11-28 2005-07-07 Constant Force Technology, Llc Methods and apparatus for generating force and torque
US20050139734A1 (en) * 2000-11-28 2005-06-30 Constant Force Technology, Llc Monitor support system
US7506853B2 (en) 2000-11-28 2009-03-24 Ergotron, Inc. Methods and apparatus for generating force and torque
US6766996B1 (en) * 2001-07-16 2004-07-27 Reid-Ashman Manufacturing, Inc. Manipulator
US20040035989A1 (en) * 2002-08-21 2004-02-26 Sweere Harry C. Stand
US6997422B2 (en) 2002-08-21 2006-02-14 Ergotron, Inc. Stand
US20040245419A1 (en) * 2003-01-17 2004-12-09 Sweere Harry C. Support arm
US7252277B2 (en) 2003-01-17 2007-08-07 Ergotron, Inc. Support arm
US9267639B2 (en) 2003-05-20 2016-02-23 Ergotron, Inc Lift mechanism systems and methods
US8286927B2 (en) * 2003-05-20 2012-10-16 Ergotron, Inc. Lift mechanism systems and methods
US9360152B2 (en) 2003-05-20 2016-06-07 Ergotron, Inc. Lift mechanism systems and methods
US20100176254A1 (en) * 2003-05-20 2010-07-15 Ergotron, Inc. Lift mechanism systems and methods
US20040250635A1 (en) * 2003-05-20 2004-12-16 Sweere Harry C. Lift mechanism based on torque equalization principles
US8925154B2 (en) 2003-05-20 2015-01-06 Ergotron, Inc. Pivot mechanism for adjusting a position of an electronic display
US9687073B2 (en) 2003-05-20 2017-06-27 Ergotron, Inc. Lift mechanism systems and methods
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Also Published As

Publication number Publication date Type
GB1273725A (en) 1972-05-10 application
FR2037056A1 (en) 1970-12-31 application
FR2037056B1 (en) 1975-02-21 grant

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