US3191902A - Telescopic construction - Google Patents

Telescopic construction Download PDF

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Publication number
US3191902A
US3191902A US278142A US27814263A US3191902A US 3191902 A US3191902 A US 3191902A US 278142 A US278142 A US 278142A US 27814263 A US27814263 A US 27814263A US 3191902 A US3191902 A US 3191902A
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US
United States
Prior art keywords
tubular member
clamp shaft
eccentric
respect
tubular members
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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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US278142A
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English (en)
Inventor
Goller Paul
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MASCHINENFABRIK KARL GOLLER KG
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MASCHINENFABRIK KARL GOLLER KG
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00—Tables with tops of variable height
    • A47B9/08—Tables with tops of variable height with clamps acting on vertical rods
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00—Tables with tops of variable height
    • A47B9/08—Tables with tops of variable height with clamps acting on vertical rods
    • A47B9/083—Tables with tops of variable height with clamps acting on vertical rods with spreading means inside a tube
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/28—Chairs or stools with vertically-adjustable seats with clamps acting on vertical rods
    • A47C3/285—Chairs or stools with vertically-adjustable seats with clamps acting on vertical rods with radially expansible clamping elements telescopically engaged in a tube or the like
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/40—Telescopic guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/10—Telescoping systems

Definitions

  • the invention refers to a telescopic guide means, applicable especially as the leg of one-legged, height-adjustable, tables and chairs, said means having at least two tubular members telescopically received into each other and said members being adjustable and fixable as desired with respectto each other by means of a hand-operable eccentric device.
  • an eccentric device is located'rotatably around a horizontal axis externally of the outer tubular member.
  • the outer tubular member has a slit through which the eccentric can enter into the interior of said tubular member and can engage the inner tubular member.
  • this known telescopic construction has first of all the drawback that the outer tubular member has an opening in the region of the eccentric device which is not completely filled by the eccentric device, so that dirt can enter into the interior of the telescopic construction.
  • This dirt enters between the contacting surfaces and inhibits the easy adjustment of the tubular members.
  • it is very difficult to produce sufficient clamping force with an eccentric which can be turned around an axis perpendicular to the common axis of the telescoped tubular members.
  • the contacting surfaces between the eccentric and the inner tubular member is so small that considerable surface pressure arises between these parts when the inner tubular member is pressed against the inner surface of theouter tubular member with sufiicient force to effect the desired fixing of the one unit with respect to the other.
  • the eccentric device may be provided with a concave contour adapted to the curve of the inner tubular member in order to produce a contacting surface that is as large as possible. This makes the fabrication of the eccentric device difiicult and yet it is necessary in order to bring about a linear contact between the eccentric device and the interior tubular member, while avoiding excessive surface pressure therebetween.
  • the purpose of the present invention is the construction of a telescopic device of'the abov-e-described kind in such a manner that it is protected against the entering of dirt and is furthermore secured by means of an inconspicuous, effective and long-lasting clamping device.
  • the present invention achieves these objects (1) by providing interiorly of the two tubular members a clamping shaft positioned parallel to the common axis of said tubular members, (2) by effecting rotation of said clamping shaft by means of a handle protruding radially at the end of one tubular member to activate an eccentric device which in turn acts upon the inner wall of said one tubular member, and (3) by installing the clamping shaft nonslidably in the other tubular member parallel with the axis of the tubular members.
  • the telescopic device can, therefore, be completely closed off, so that no dirt can enter between the contacting surfaces.
  • the telescopic device is easily adjusted even after having been in use for a long time.
  • the handle protrudes from the end of one tubular member, it can be attached inconspicu-ously and other operating parts of the clamping device are concealed. This is particularly important in View of the fact that the evice according to the present invention is used in the construction of furniture. Protruding and conspicuous parts of a clamping device would impair the appearance of the furniture piece.
  • a pressure piece which is movable transversely to the axis of the tubular members and is located between the eccentric device and the inner surface of the tubular member on which it acts.
  • an eccentric type of clamping effect can be achieved in the case of tubular members of various cross sections.
  • the contour of the pressure piece can easily be adapted to inner tubular member surfaces of any shape. This is further advantageous in that it makes possible a coaxial arrangement of the two tubular members with respect to each other and makes it possible to easily replace a worn pressure piece.
  • tubular members of circular cross section are used, it may be desirable to guide the clamping shaft on at least one transverse bridge in one tubular member and to connect it nonrota'tably with an eccentric, which latter has a cylindrical surface lying against the inner Wall of the other tubular member, said last-named member being arranged eccentrically with respect to the clamping shaft.
  • the curved surface of the eccentric device bears against the inner surface of the tubular member over a large area so that a large clamping force can be achieved with little wear.
  • FIGURE 1 shows a side view, partially in longitudinal section, of a telescopic device constructed as a table leg with an eccentric clamping device according to the invention.
  • FIGURE 2 shows a section through the telescopic device taken on the line IIII in FIGURE 1.
  • FIGURE 3 shows a modification of the telescopic device according to the present invention, partially in longitudinal section and partially in side elevation.
  • FIGURE 4 is a view, on an enlarged scale, of a fragment of FIGURE 1.
  • FIGURE 5 is a sectional view taken on the line VV of FIGURE 4.
  • FIG- URES 1-2 of the drawing represents at 1 the leg of a one-legged table or chair.
  • the device consists of a fixed outer tubular member 2 and a longitudinally movable inner tubular member 3 guided therein.
  • Said tubular member 3 supports a bracket 4 for the fastening of a table top or a seat.
  • Tubular member 2 rests at its lower end on feet 5.
  • tubular member 2 as well as inner tubular member 3 are square in cross section.
  • corner cages 6 are arranged in two opposite corners between the tubular members. In these cages balls 7 are provided as friction-reducing bodies.
  • Outer tubular member 2 has no openings whatsoever and is closed at its top by ring disk 2a, so that the operating parts of the telescopic de vice are completely sealed and protected against the entry of dirt from the outside.
  • an eccentric clamping device In order to fix the tubular members 2 and 3 in the respective positions desired, an eccentric clamping device is provided.
  • This device comprises a clamp shaft 8 p which in the embodiment shown is arranged rotatably in the interior of inner tubular member 3 and is held against sideward movement therein by the guide 9 and support 19.
  • the hand lever 11 is provided which protrudes sidewards from the inner tubular member through slot 52. This slot is of sufficient circumferential length to permit the turning of lever 11 to the extent necessary for the activation of the clamping device.
  • Clamp shaft 8 carries an eccentric generally designated at 12. Between this clamp shaft 8 and the interior space of the outer tubular member 2 (in the construction according to FIGURES 1-2) there is inserted the pressure piece 13, the same being movable transversely to the axis of the tubular members. Thus, the pressure piece 13 is movable radially of the inner tubular member 3 through the opening 14 provided therethrough. To extend the guide surface for said pressure piece, a small plate 15 is welded exteriorly of the inner tubular member 3, said plate being provided with a hole aligned with the opening 14.
  • the pressure piece 13 has a head surface 13a which is also planar.
  • a simple cylindrical peg with a planar end can be used as the pressure piece.
  • the outer tubular member 2 and the inner tubular member 3 are coaxial with respect to each other and the clamp shaft 8 is also coaxial to the tubular members.
  • the inner tubular member present an eccentric surface in order to move the pressure piece 13 and accordingly such a surface is formed by providing the guide member 9 with an eccentric groove 16 into which the pressure piece 13 enters.
  • the guide member 9 thus has two functions: on the one hand, it supports clamp shaft 8 against sideward displacement and on the other hand it serves as an eccentric for the tightening of the pressure piece 13. This provides an extremely simple construction for accomplishing these purposes.
  • a supporting spring 17 is provided with one end thereof supported on and by the bottom of the outer tubular member 2.
  • the clamping shaft 8 is constructed as a hollow shaft whereby the supporting spring 17 enters into said hollow clamp shaft 8 and is guided by it.
  • the guide member 9 is constructed as a ring through which the supporting spring 17 extends, the upper side of said ring being attached in a convenient manner, such as by welding, to the lower end of the clamp shaft 8.
  • the upper end of the spring 17, namely, the end thereof entering into the clamp shaft 8 bears against an insert piece 18 which is solidly connected with the clamp shaft 8.
  • Said insert piece 18 also supports a hand lever 11.
  • the drawing shows the clamping apparatus in a released condition.
  • the pressure piece 13 is shown at the lower end of the eccentric groove 16 and it is held free from pressure although with its head surface in contact with the inner surface of the tubular member 2.
  • a shallower portion of the eccentric groove 16 comes in register with the pressure piece 13, with the result that the latter is impelled outwardly, namely, toward the right as appearing in FIGURES 1 and 2, whereby to be pressed against the inner surface of the outer tubular member 2.
  • the inner tubular member 3 can be fixed at any desired height with respect to the outer tubular member 2.
  • the spring 17 urges the inner tubular member 3 upwardly out of the outer tubular member either until the clamping device is again tightened or until the upper front edge of the cage 6 touches the ring piece 2a. Entry of the inner tubular member 3 into the outer tubular member is limited by the bar 19, having a square cross section, which bar reaches from the bottom of the outer tubular member 2 to a point near its upper end.
  • FIGURE 3 of the drawing there is represented at 20 the leg of a one-legged chair with a height-adjustable seat.
  • This leg is again constructed as a telescopic devioe with two tubular members 21 and 22 of circular cross section telescoped into each other.
  • a schematically indicated seat 23 is attached to the upper end of the inner tubular member 21.
  • the outer tubular member 22 is supported upon a foot 24 in a manner described in more detail below.
  • This foot can advantageously consist of three foot supports arranged equiangularly with respect to each other and projecting radially from the chair leg.
  • a sliding ring 25 and a transverse bridge 26, both of circular construction, are fixedly connected to the interior tubular member 21 and both said ring and said bridge lie against the interior wall of the outer tubular member 22.
  • the circumferential outer surfaces of the ring 25 and the bridge 26 in cooperation with the cooperating inner wall of the outer tubular member 22 form the contact surfaces for the telescopic engagement in this embodiment.
  • a resilient ring 27 at the upper end of the outer tubular member 22 the same being secured against axial displacement, the maximum extension of the telescoping device can be limited.
  • a suitable eccentric clamping device by means of which the two tubular members 21 and 22 can be fixed in any desired position with respect to each other.
  • the clamping device of the invention is here provided with a clamp shaft 28 which is arranged within the interior of the tubular members 21 and 22 and is positioned parallel to the common axis of said tubular members.
  • the clamp shaft can be rotated by means of the handle 29 which protrudes radially from the side of the inner tubular member through a slot 30 located in the upper end of the inner tubular member 21.
  • Firmly connected with the clamp shaft 28 is an eccentric 31 which lies against the inner cylindrical surface of the outer tubular member 22.
  • the clamp shaft 28 is positioned within the inner tubular member 21 in such a manner that it can be rotated but it cannot be moved transverse with respect to the axis of the tubular members.
  • the clamp shaft 28 is shown as a straight rod or pipe and it is arranged eccentrically to the common axis of the tubular members 21 and 22. An eccentricity of approximately 0.5 mm. appears to be desirable.
  • sidewise displacement guide openings 33 and 34 are provided, respectively, in a transverse bridge 26 and in a further transverse bridge 32 which latter is located at the upper end of the inner tubular member. These openings are offset transversely from the axis of the tubular member to the extent of the eccentricity of the clamp shaft 28 and said clamp shaft 28 extends through said openings.
  • the eccentric device 31 can be constructed as a simple cylindrical disk which normally is in contact by its circumferential outer surface 31 with the inner wall of the outer tubular member 22.
  • the construction of the clamping device in this form is particularly simple inasmuch as the clamp shaft 18 a straight rod without any eccentric, protrusions, pegs or similar.
  • the transverse bridge 26 may be attached by any convenient means, such as by Welding and the eccentric will be arranged in such a manner that its upper surface is fiat and lies against the transverse bridge 2-6.
  • the clamp shaft is not subjected to strain by bending but is required merely to resist shear forces.
  • the clamping force produced by the eccentric is transmitted on the one hand to the cylindrical circumferential surface 31 of the eccentric 31 and on the other hand to a similarly cylindrical circumferential surface of the transverse bridge 26. Since the clamping force thus takes place on a surface of substantial area, the unit surface pressure remains small.
  • FIGURE 3 also shows that the eccentric clamping device shown therein, because of the use of an axially arranged clamp shaft 28, does not require any openings in the external tubular member 22 so that the actual telescopic device is completely sealed off and protected against the entry of dirt.
  • the pressure spring 35 compensating for the weight of the chair which spring is supported at its lower end on a plate 36 which in turn is connected with a foot 24 through a screw 37.
  • the pressure spring 35 bears at its upper end against the eccentric disk 31.
  • To provide a guide for the spring 35 it is preferable to extend the clamping shaft 28 through the eccentric disk 31 so that its end 28 enters. into the pressure spring 35. If the diameter of the clamp shaft 28 is not sufficient for proper guidance of the spring 35, then a sleeve 38 with an appropritate outer diameter can be telescoped onto the end 2 and suitably connected thereto, such as by welding.
  • a further guide 39 is provided at the lower end of the spring 35 for retaining same in its proper position. This guide is fastened to the plate in any convenient manner,
  • the eccentric disk 31 not only serves its main function as a clamping device, but also as a support for the weightcompensating spring.
  • the chair leg can be constructed as a resilient and revolving leg. This follows because of the arrangement of eccentric clamping device in the interior of the two tubular members.
  • the outer tubular member 22 is introduced into a standing tubular member 40 which is solidly connected through the foot 24 to the plate 36.
  • a slide ring 41 and a slide bridge 42 are attached to the outer tubular member 22.
  • the circumferential surfaces of said slide ring and slide bridge cooperate with the interior surface of the standing tubular member 40 to act as guide surfaces for relative axial movement of the outer tubular member 22 in and with respect to the standing tubular member 4%
  • the outer tubular member 22 is here supported on plate 36 and connected with the foot 24 through the strong pressure spring 43.
  • I A thrust hearing structure 44 is provided between the pressure spring 43 and the sliding bridge 42.
  • the outer tubular member when the telescopic apparatus is locked, can be itself telescoped into the standing tubular member against the force of the pressure spring 43 so that a resilient support of the seat is obtained.
  • the pressure spring 43 must have sufiicient capacity to absorb the weight applied to the chair seat 23.
  • the thrust bearing 44 permits a turning of the seat relative to the foot 24.
  • the eccentricity of the clamp shaft with respect to the outer tubular member could also be obtained by arranging said clamp shaft axially with respect to the inner tubular member and arranging the latter eccentrically to the outer tubular member.
  • an eccentric member could be used which would have the form of a noncircular segment.
  • a telescopic construction especially for use as a table or chair leg, comprising: i
  • clamping means on said clamp shaft for rotation therewith, said clamping means having a surface which is eccentric with respect to the other of said tubular members for effecting relative radial movement of said members and thereby releasably clamping together said tubular members in response to rotation of said clamp shaft.
  • a telescopic construction according to claim -1 in which the contact surface of said pressure piece lying against the inner surface of said other tubular member has the same contour as the contour of the inner surface of said other tubularmember.
  • a telescopic construction according to claim 2 in which the clamp shaft and the tubular members are coaxial with respect to each other, a cylindrical guide memher on said clamp shaft by which it is supported against lateral movement in and with respect to said tubular members, said guide member having an eccentric groove in its circumferential surface int-0 which said pressure piece enters.
  • tubular members are of circular cross section, at least one transverse bridge within said one tubular member for supporting said clamp shaft, said clamp shaft being connected in nonrotatable relationship with a disk, said disk having a circular circumferential surface lying against the interior wall of the other tubular member, said other tubular member being arranged eccentrically relative to said clamp shaft.
  • a telescopic construction according to claim 8 in which the transverse bridge is positioned within the inner tubular member and the disk is positioned in the outer tubular member.
  • a telescopic construction especially for use as a table or chair leg, comprising:
  • a clamp shaft inside of said inner member and extending from adjacent the upper end thereof toward the lower end thereof;
  • said clamp shaft having a surface which is eccentric with respect to the inner surface of said outer membet and which is located therewithin;
  • a telescopic construction especially for use as a table or chair leg, comprising:
  • a clamp shaft inside of said inner member and extending from adjacent the upper end thereof toward the lower end thereof, the axis of said clamp shaft being parallel with and laterally offset from the common axis of said members;

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Chairs Characterized By Structure (AREA)
US278142A 1962-05-09 1963-05-06 Telescopic construction Expired - Lifetime US3191902A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG0034939 1962-05-09
DEM0055978 1963-03-04

Publications (1)

Publication Number Publication Date
US3191902A true US3191902A (en) 1965-06-29

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ID=25978420

Family Applications (1)

Application Number Title Priority Date Filing Date
US278142A Expired - Lifetime US3191902A (en) 1962-05-09 1963-05-06 Telescopic construction

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US (1) US3191902A (en))
BE (1) BE632123A (en))
CH (1) CH414091A (en))
FR (1) FR1354070A (en))
GB (1) GB976916A (en))
NL (1) NL292274A (en))

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3481286A (en) * 1967-11-24 1969-12-02 Borg Warner Overbed table
US3506234A (en) * 1966-02-08 1970-04-14 Kurt Roder Vertically adjustable column,particularly for swivel chairs
US5020752A (en) * 1990-06-12 1991-06-04 Westinghouse Electric Corporation Adjustable pedestal for tables and the like
US6247772B1 (en) * 1996-02-12 2001-06-19 Haworth, Inc. Cabinet unit with pivoting height-adjustable work surface
US20050040300A1 (en) * 2003-08-21 2005-02-24 Chien-Kuo Chang Contractible table leg structure
US7421956B1 (en) * 2003-07-16 2008-09-09 Mccarthy Clive Basket with extendable legs
US20110048291A1 (en) * 2009-08-25 2011-03-03 Humanscale Corporation Counterbalance apparatus
US20130048648A1 (en) * 2011-08-22 2013-02-28 James David Robertson Cooler with automatic product height adjustment mechanism
CN103082664A (zh) * 2013-03-08 2013-05-08 李德胜 带有升降装置的学生预防近视眼课桌椅
CN106382675A (zh) * 2016-11-16 2017-02-08 贵州航炬电器科技有限公司 一种升降电暖炉
CN114028149A (zh) * 2021-11-09 2022-02-11 杭州杰莺医疗科技有限公司 一种电动椅旋转定位装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR535710A (fr) * 1921-04-09 1922-04-20 Strapontin
FR656640A (fr) * 1928-06-29 1929-05-10 Dispositif pour bloquage ou embrayage entre elles de pièces coulissantes ou rotatives, et mode d'application à un siège
FR40469E (fr) * 1928-06-29 1932-07-01 Dispositif pour bloquage ou embrayage entre elles de pièces coulissantes ou rotatives, et mode d'application à un siège
FR41661E (fr) * 1928-06-29 1933-03-10 Dispositif pour bloquage ou embrayage entre elles de pièces coulissantes ou rotatives, et mode d'application à un siège
US2516801A (en) * 1944-03-16 1950-07-25 Harold E Renaud Chair having spring supported seat
FR1040113A (fr) * 1951-07-24 1953-10-13 Pied-support
FR1104061A (fr) * 1954-04-26 1955-11-16 Perfectionnements aux tablettes réglables
FR68604E (fr) * 1955-01-18 1958-05-05 Applic Ind Tube Perfectionnements aux tablettes réglables

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR535710A (fr) * 1921-04-09 1922-04-20 Strapontin
FR656640A (fr) * 1928-06-29 1929-05-10 Dispositif pour bloquage ou embrayage entre elles de pièces coulissantes ou rotatives, et mode d'application à un siège
FR40469E (fr) * 1928-06-29 1932-07-01 Dispositif pour bloquage ou embrayage entre elles de pièces coulissantes ou rotatives, et mode d'application à un siège
FR41661E (fr) * 1928-06-29 1933-03-10 Dispositif pour bloquage ou embrayage entre elles de pièces coulissantes ou rotatives, et mode d'application à un siège
US2516801A (en) * 1944-03-16 1950-07-25 Harold E Renaud Chair having spring supported seat
FR1040113A (fr) * 1951-07-24 1953-10-13 Pied-support
FR1104061A (fr) * 1954-04-26 1955-11-16 Perfectionnements aux tablettes réglables
FR68604E (fr) * 1955-01-18 1958-05-05 Applic Ind Tube Perfectionnements aux tablettes réglables

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3506234A (en) * 1966-02-08 1970-04-14 Kurt Roder Vertically adjustable column,particularly for swivel chairs
US3481286A (en) * 1967-11-24 1969-12-02 Borg Warner Overbed table
US5020752A (en) * 1990-06-12 1991-06-04 Westinghouse Electric Corporation Adjustable pedestal for tables and the like
US6247772B1 (en) * 1996-02-12 2001-06-19 Haworth, Inc. Cabinet unit with pivoting height-adjustable work surface
US7421956B1 (en) * 2003-07-16 2008-09-09 Mccarthy Clive Basket with extendable legs
US6923410B2 (en) * 2003-08-21 2005-08-02 Chien-Kuo Chang Contractible table leg structure
US20050040300A1 (en) * 2003-08-21 2005-02-24 Chien-Kuo Chang Contractible table leg structure
US20110048291A1 (en) * 2009-08-25 2011-03-03 Humanscale Corporation Counterbalance apparatus
WO2011025561A1 (en) * 2009-08-25 2011-03-03 Humanscale Corporation Counterbalance apparatus
US8201505B2 (en) 2009-08-25 2012-06-19 Long Dennis L Counterbalance apparatus
US20130048648A1 (en) * 2011-08-22 2013-02-28 James David Robertson Cooler with automatic product height adjustment mechanism
CN103082664A (zh) * 2013-03-08 2013-05-08 李德胜 带有升降装置的学生预防近视眼课桌椅
CN103082664B (zh) * 2013-03-08 2014-03-26 李德胜 带有升降装置的学生预防近视眼课桌椅
CN106382675A (zh) * 2016-11-16 2017-02-08 贵州航炬电器科技有限公司 一种升降电暖炉
CN114028149A (zh) * 2021-11-09 2022-02-11 杭州杰莺医疗科技有限公司 一种电动椅旋转定位装置

Also Published As

Publication number Publication date
GB976916A (en) 1964-12-02
CH414091A (de) 1966-05-31
BE632123A (en)) 1963-09-02
NL292274A (en)) 1965-07-12
FR1354070A (fr) 1964-02-28

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