EP0500187B1 - Leg structure - Google Patents

Leg structure Download PDF

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Publication number
EP0500187B1
EP0500187B1 EP92200503A EP92200503A EP0500187B1 EP 0500187 B1 EP0500187 B1 EP 0500187B1 EP 92200503 A EP92200503 A EP 92200503A EP 92200503 A EP92200503 A EP 92200503A EP 0500187 B1 EP0500187 B1 EP 0500187B1
Authority
EP
European Patent Office
Prior art keywords
leg structure
pillars
right angle
foot
work surface
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.)
Revoked
Application number
EP92200503A
Other languages
German (de)
French (fr)
Other versions
EP0500187A1 (en
Inventor
Willem Eduard Van De Schee
Willi Van Engeland
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.)
VAN ENGELAND MANAGEMENT B.V.
Original Assignee
VAN ENGELAND MANAGEMENT BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19858924&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0500187(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by VAN ENGELAND MANAGEMENT BV filed Critical VAN ENGELAND MANAGEMENT BV
Publication of EP0500187A1 publication Critical patent/EP0500187A1/en
Application granted granted Critical
Publication of EP0500187B1 publication Critical patent/EP0500187B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • 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
    • A47B9/04—Tables with tops of variable height with vertical spindle
    • 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
    • A47B9/04—Tables with tops of variable height with vertical spindle
    • A47B2009/043—Tables with tops of variable height with vertical spindle with means connecting the spindles of the various legs
    • 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
    • A47B9/04—Tables with tops of variable height with vertical spindle
    • A47B2009/046—Tables with tops of variable height with vertical spindle with gearbox

Definitions

  • a leg structure therein comprises a foot, a pillar of adjustable length connected thereto and consisting of two parts telescopically movable relative to one another and right angle transmissions according to the first part of claim 1.
  • the invention has for its object to provide a leg structure which, using simple means, offers a greatly increased mechanical stability and a greatly improved load-taking capacity of the work surface.
  • the invention provides a leg structure with adjustable length for bearing together with at least one other leg structure a work surface and characterized by the features of claim 1.
  • right angle transmissions of different types are known. There exist for instance worm gearings and gear wheel transmissions. For a transmission that is as free of friction as possible it is recommended according to the invention that the right angle transmissions are gear wheel transmissions, for instance of the type with bevel gear wheels. Such gear wheel transmissions also have the advantage of being generally better capable than worm gearings of causing input and output shaft to exchange function. It will be apparent in the light of the description following hereinafter that this is essential, certainly for particular embodiments of the leg structure according to the invention.
  • the right angle transmissions are mutually coupled by means of a coupling shaft having at least one cardan joint.
  • the non-round coupling parts extending in horizontal direction which can be seen as the input or output shaft of the right angle transmissions, will never lie exactly in line with each other.
  • the coupling shaft is slidable to a limited extent relative to the right angle transmissions.
  • the drive means comprise a motor.
  • the motor can be of per se known type. An inexpensive, commercially available windscreen wiper motor has for instance been found to be very suitable.
  • the motor is incorporated in a leg.
  • the motor is placed internally and can engage for instance onto the or a coupling shaft.
  • a determined embodiment is characterized by coupling means at least present on one of the right angle transmissions for coupling to another leg structure of adjustable length. It will be apparent that it is preferred that all leg structures of a table are coupled mechanically for rotation with each other by joint driving. On the one hand this limits the number of drives and therewith the costs; on the other this provides in the most natural way an exactly similar height adjustment of the various leg structures.
  • the leg structure comprises limit switches which switch off the motor when respectively a highest or lowest position has been reached. It will be apparent that with a table having more than one leg structure only one of the leg structures is required to have such limit switches.
  • Figure 1 shows a leg structure 1 of adjustable length, which comprises: a foot 2 for placing on the ground; a support 4 for coupling to a work surface 3 (see figure 2); two pillars 5, 6 of adjustable length which are rigidly connected on one side to the foot 2 and on the other to the support 4.
  • Each of these pillars 5, 6 comprises two hollow parts telescopically movable relative to one another, namely an upper part 7 that is connected to the support 4 and a lower part 8 connected to the foot 2 and provided with a spindle nut 9 which is locked against rotation and into which is screwed a screw spindle 10 mounted on the upper part 7, and a right angle transmission 11 present on the upper part 7.
  • These right angle transmissions 11 of both pillars 5, 6 are identical and of the type with bevel gear wheels.
  • a motor 12 is coupled slightly slidably via cardan transmissions 13, 14 to the horizontal shafts 15 of the right angle transmissions 11.
  • the coupling between cardan transmissions 13, 14 and the horizontal shafts of the right angle transmissions 11 takes place by means of complementary non-round parts.
  • the lower part 8 of leg 6 carries on the spindle nut 9 two limit switches 16 and 17 respectively. These limit switches can co-act respectively with a disc 18 present on the bottom end of the screw spindle 10 for defining the greatest length of leg structure 1 and with the underside of the housing of the right angle transmission 11 for defining the shortest length of leg structure 1.
  • the limit switches embodied as microswitches are connected to a feed and control unit 19 which is designated only schematically and which can be mounted at any desired location, for instance under the table top 3.
  • This unit 19 can be connected to the mains supply and drives the motor 12 via wires 20 under the control of a switch 21 (not drawn) with which the user can cause the motor 12 to turn in respectively the one or other direction and to the limit switches 16, 17 which stop the motor by terminating the energizing when the extreme positions are reached.
  • the table 22 comprises two leg structures 23, 24, wherein the leg structure 24 bears the drive motor 25 and the other leg structure 23 is driven via a coupling shaft 26 from a right angle transmission 27 of the gear wheel type. It is noted that all input and output shafts of the right angle transmission 27-30 are centrally oriented, that is, the said coupling shafts are radially oriented and the screw spindles 10 are coaxially oriented.
  • the coupling shaft 26 likewise comprises two schematically depicted cardan joints 31, 32.

Landscapes

  • Legs For Furniture In General (AREA)
  • Ladders (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Tables And Desks Characterized By Structural Shape (AREA)
  • Casings For Electric Apparatus (AREA)
  • Pallets (AREA)
  • Fluid-Damping Devices (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Prostheses (AREA)

Abstract

The invention lies in the field of tables whereof the work surface is height-adjustable. The invention has for its object to provide a leg structure (1) which, using simple means, offers a greatly increased mechanical stability and a greatly improved load-taking capacity of the work surface (3) and provides a leg structure with adjustable length for bearing together with at least one other leg structure a work surface, which leg structure comprises: a foot (2) for placing on the ground; a support (4) for coupling to the work surface; two pillars of adjustable length which are rigidly connected on one side to the foot and on the other to the support, each of which pillars comprises: two parts telescopically movable relative to one another, namely an upper part that is connected to the support and a lower part connected to the foot and provided with a spindle nut into which is screwed a screw spindle mounted on the upper part; a right angle transmission present on the upper part wherein the right angle transmissions of both pillars have equal transmission ratios and are mutually coupled such that when the screw spindles are rotated the pillars undergo equal changes in length; and drive means for rotatably driving the screw spindles. <IMAGE>

Description

  • The invention lies in the field of tables whereof the work surface is height-adjustable. Such tables are known for instance from WO 83/01183. A leg structure therein comprises a foot, a pillar of adjustable length connected thereto and consisting of two parts telescopically movable relative to one another and right angle transmissions according to the first part of claim 1.
  • The invention has for its object to provide a leg structure which, using simple means, offers a greatly increased mechanical stability and a greatly improved load-taking capacity of the work surface.
  • In this respect the invention provides a leg structure with adjustable length for bearing together with at least one other leg structure a work surface and characterized by the features of claim 1.
  • Right angle transmissions of different types are known. There exist for instance worm gearings and gear wheel transmissions. For a transmission that is as free of friction as possible it is recommended according to the invention that the right angle transmissions are gear wheel transmissions, for instance of the type with bevel gear wheels. Such gear wheel transmissions also have the advantage of being generally better capable than worm gearings of causing input and output shaft to exchange function. It will be apparent in the light of the description following hereinafter that this is essential, certainly for particular embodiments of the leg structure according to the invention.
  • The right angle transmissions are mutually coupled by means of a coupling shaft having at least one cardan joint. The non-round coupling parts extending in horizontal direction, which can be seen as the input or output shaft of the right angle transmissions, will never lie exactly in line with each other. By coupling by means of a coupling shaft having at least one cardan joint a positive transmission between both gear wheel transmissions is ensured under all conditions.
  • The coupling shaft is slidable to a limited extent relative to the right angle transmissions.
  • Use can be made of a rotatable handle to adjust the leg structure and therewith the height of the table. It is preferred however that the drive means comprise a motor. The motor can be of per se known type. An inexpensive, commercially available windscreen wiper motor has for instance been found to be very suitable.
  • In a particular embodiment the motor is incorporated in a leg. Depending on the dimensions of the motor, which may possibly have to drive a number of leg structures simultaneously, there may not always be sufficient space available in a leg. In that case the motor is placed internally and can engage for instance onto the or a coupling shaft.
  • A determined embodiment is characterized by coupling means at least present on one of the right angle transmissions for coupling to another leg structure of adjustable length. It will be apparent that it is preferred that all leg structures of a table are coupled mechanically for rotation with each other by joint driving. On the one hand this limits the number of drives and therewith the costs; on the other this provides in the most natural way an exactly similar height adjustment of the various leg structures.
  • In a specific embodiment the leg structure comprises limit switches which switch off the motor when respectively a highest or lowest position has been reached. It will be apparent that with a table having more than one leg structure only one of the leg structures is required to have such limit switches.
  • The invention will now be elucidated with reference to annexed drawings of an embodiment. In the drawings:
    • figure 1 shows a partly broken away perspective view of a leg structure according to the invention; and
    • figure 2 shows a table with two leg structures according to the invention.
  • Figure 1 shows a leg structure 1 of adjustable length, which comprises: a foot 2 for placing on the ground; a support 4 for coupling to a work surface 3 (see figure 2); two pillars 5, 6 of adjustable length which are rigidly connected on one side to the foot 2 and on the other to the support 4. Each of these pillars 5, 6 comprises two hollow parts telescopically movable relative to one another, namely an upper part 7 that is connected to the support 4 and a lower part 8 connected to the foot 2 and provided with a spindle nut 9 which is locked against rotation and into which is screwed a screw spindle 10 mounted on the upper part 7, and a right angle transmission 11 present on the upper part 7. These right angle transmissions 11 of both pillars 5, 6 are identical and of the type with bevel gear wheels.
  • A motor 12 is coupled slightly slidably via cardan transmissions 13, 14 to the horizontal shafts 15 of the right angle transmissions 11. The coupling between cardan transmissions 13, 14 and the horizontal shafts of the right angle transmissions 11 takes place by means of complementary non-round parts.
  • The lower part 8 of leg 6 carries on the spindle nut 9 two limit switches 16 and 17 respectively. These limit switches can co-act respectively with a disc 18 present on the bottom end of the screw spindle 10 for defining the greatest length of leg structure 1 and with the underside of the housing of the right angle transmission 11 for defining the shortest length of leg structure 1. For this purpose the limit switches embodied as microswitches are connected to a feed and control unit 19 which is designated only schematically and which can be mounted at any desired location, for instance under the table top 3. This unit 19 can be connected to the mains supply and drives the motor 12 via wires 20 under the control of a switch 21 (not drawn) with which the user can cause the motor 12 to turn in respectively the one or other direction and to the limit switches 16, 17 which stop the motor by terminating the energizing when the extreme positions are reached.
  • The table 22 according to figure 2 comprises two leg structures 23, 24, wherein the leg structure 24 bears the drive motor 25 and the other leg structure 23 is driven via a coupling shaft 26 from a right angle transmission 27 of the gear wheel type. It is noted that all input and output shafts of the right angle transmission 27-30 are centrally oriented, that is, the said coupling shafts are radially oriented and the screw spindles 10 are coaxially oriented. The coupling shaft 26 likewise comprises two schematically depicted cardan joints 31, 32.

Claims (1)

  1. Leg structure with adjustable length for bearing together with at least one other leg structure a work surface, which leg structure comprises:
       a foot (2) for placing on the ground;
       a support (4) for coupling to the work surface;
       two pillars (5,6) of adjustable length which are rigidly connected on one side to the foot and on the other to the support, each of which pillars comprises:
       two parts telescopically movable relative to one another, namely an upper part (7) that is connected to the support and a lower part (8) connected to the foot and provided with a spindle nut (9) into which is screwed a screw spindle (10) mounted on the upper part (7);
       a right angle transmission (11) present on the upper part (7), wherein the right angle transmissions of both pillars have equal transmission ratios and are mutually coupled such that when the screw spindles are rotated the pillars undergo equal changes in length; and
       drive means (12) for rotatably driving the screw spindles,
       the right angle transmissions (11) being gear wheel transmissions, for instance of the type with bevel gear wheels,
       characterized in that
       the right angle transmissions (11) are mutually coupled by means of a coupling shaft (15) having at least one cardan joint, and
       the coupling shaft (15) is slidable to a limited extent relative to the right angle transmissions.
EP92200503A 1991-02-22 1992-02-20 Leg structure Revoked EP0500187B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9100324 1991-02-22
NL9100324A NL9100324A (en) 1991-02-22 1991-02-22 LEG STRUCTURE.

Publications (2)

Publication Number Publication Date
EP0500187A1 EP0500187A1 (en) 1992-08-26
EP0500187B1 true EP0500187B1 (en) 1995-10-11

Family

ID=19858924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92200503A Revoked EP0500187B1 (en) 1991-02-22 1992-02-20 Leg structure

Country Status (7)

Country Link
EP (1) EP0500187B1 (en)
AT (1) ATE128824T1 (en)
DE (1) DE69205302T2 (en)
DK (1) DK0500187T3 (en)
ES (1) ES2080426T3 (en)
GR (1) GR3018300T3 (en)
NL (1) NL9100324A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262030B (en) * 1991-12-06 1995-08-02 Energy Facilities Management L Improved workstation
DE29611613U1 (en) * 1996-07-03 1996-09-05 Knuerr Mechanik Ag Worktable
DE19642387C1 (en) * 1996-10-14 1998-04-30 Veyhl Gmbh Table base frame
DE19801489C2 (en) * 1998-01-16 2001-11-29 Knuerr Mechanik Ag Workplace
NL1008761C2 (en) 1998-03-31 1999-10-01 Engeland Management Bv Van Device for setting the height of an object.
SE0003761D0 (en) * 2000-10-18 2000-10-18 Svenska Kenab Karlshamns Ergon Length adjustable leg device
ITPD20030002U1 (en) * 2003-01-13 2004-07-14 Palma Snc Di Marcato Dario E Romano HEIGHT ADJUSTABLE COFFEE TABLE
CN107307585B (en) 2016-04-26 2019-12-20 第一传动科技股份有限公司 Electric table foot rest and shaft coupling thereof and electric table using table foot rest
CN112815044A (en) * 2021-02-07 2021-05-18 德沃康科技集团有限公司 One-electric two-drive synchronous driving device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE846903C (en) * 1950-09-07 1952-08-18 Franz Minet Table in which the table top rests on at least one base
DE8128983U1 (en) * 1981-10-03 1982-03-11 Willy Fleischer Metallwarenfabrik GmbH und Co KG, 4630 Bochum "HEIGHT-ADJUSTABLE TABLE FOR SCREEN WORKSTATIONS"

Also Published As

Publication number Publication date
DE69205302T2 (en) 1996-04-04
DE69205302D1 (en) 1995-11-16
ES2080426T3 (en) 1996-02-01
EP0500187A1 (en) 1992-08-26
DK0500187T3 (en) 1996-02-19
ATE128824T1 (en) 1995-10-15
GR3018300T3 (en) 1996-03-31
NL9100324A (en) 1992-09-16

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