WO2000008975A1 - Mecanisme de verrouillage - Google Patents

Mecanisme de verrouillage Download PDF

Info

Publication number
WO2000008975A1
WO2000008975A1 PCT/GB1999/002387 GB9902387W WO0008975A1 WO 2000008975 A1 WO2000008975 A1 WO 2000008975A1 GB 9902387 W GB9902387 W GB 9902387W WO 0008975 A1 WO0008975 A1 WO 0008975A1
Authority
WO
WIPO (PCT)
Prior art keywords
chair
sliding
aperture
engaging
actuator
Prior art date
Application number
PCT/GB1999/002387
Other languages
English (en)
Inventor
Gordon Dennis Hobb
Original Assignee
Northeastern Components (International) Ltd
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
Application filed by Northeastern Components (International) Ltd filed Critical Northeastern Components (International) Ltd
Publication of WO2000008975A1 publication Critical patent/WO2000008975A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/026—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of peg-and-notch or pawl-and-ratchet mechanism
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/443—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs
    • A47C7/444—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs of torsion type
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs

Definitions

  • the present invention relates to a locking mechanism, and relates particularly, but not exclusively, to a locking mechanism for enabling adjustment of the inclination of the back and/or seat of an office chair.
  • Mechanisms for adjusting the inclination of the back and seat of an office chair relative to each other and to the ground are known in which pivoting movement of the seat relative to the ground and/or of the back relative to the seat is controlled by locking the seat or back in position by means of one or more small pressurised gas cylinders.
  • the chair back and/or seat are generally biased by springs towards the upright position of the chair, and the desired orientation of the chair is chosen by releasing the locking mechanism, moving the back and/or seat of the chair to the desired inclination, and locking the chair in that orientation.
  • Locking mechanisms of the gas cylinder type generally suffer from the disadvantage that the gas cylinders are expensive and need to be purchased from specialist manufacturers, and have a relatively short life expectancy, typically two to three years in normal use of the chair.
  • the locking mechanisms of the multi-plate clutch type suffer from the disadvantage that they are also costly because of the significant number of parts involved, thus making assembly more difficult, and the locking action of the locked mechanism can often be overcome if sufficient force is applied to the chair.
  • locking mechanisms usually form an integral part of the main mechanism of each individual chair, it is difficult to produce a single mechanism that can be used in several different types of chair.
  • locking mechanisms of the multi -plate clutch type require an eccentric cam to be attached to the mechanism, and the locking mechanism often requires a considerable force to operate the cam, which in turn makes the mechanism difficult to operate.
  • a potentially more serious disadvantage of office chairs containing locking mechanisms of both the gas-cylinder and clutch types is that when the back of a chair is locked in a reclined position, it can be inadvertently released by a person not sitting fully back against the back of the chair. As a result, because the chair back is generally biased by springs towards the upright position of the chair, the back of the chair can be projected forwards under the biasing force of the springs with sufficient force to cause injury.
  • Preferred embodiments of the present invention seek to overcome the above disadvantages of the prior art .
  • a device for adjusting the relative inclination of two parts of a chair comprising:
  • a body member having an aperture and adapted to be fixed relative to a first part of the chair
  • sliding member having an engaging portion arranged adjacent said aperture in use, wherein the sliding member is adapted to be fixed relative to a second part of the chair and to slide relative to the body member to adjust the relative inclination of said first and second parts;
  • an actuator member adapted to move between a first position in which the actuator member urges said engaging member into engagement with said engaging portion and a second position in which said engaging member does not prevent sliding relative movement of said body member and said sliding member, wherein said actuator member is prevented from moving from said first position to said second position when the device is subjected to a load tending to cause sliding relative movement of said body member and said sliding member.
  • the sliding member may be received in a slot in the body member.
  • the engaging member comprises a ball bearing
  • the engaging portion comprises a plurality of recesses, wherein each said recess is adapted to partially receive said ball bearing to prevent sliding relative movement of said body member and sliding member.
  • the actuator member is preferably arranged adjacent said aperture and is adapted to slide between said first and second positions .
  • the actuator member may include an inclined portion for abutting said engaging member to urge said engaging member into engagement with said engaging means as the actuator member moves from said second position to said first position.
  • the actuator member is at least partially received within a further aperture in said body member, wherein when the actuator member is in said first position and the device is subjected to a load tending to cause sliding relative movement of said body member and said sliding member, the actuator member is urged into engagement with said body member to prevent movement of the actuator member to said second position.
  • a chair comprising a first part, a second part, and a device as defined above for adjusting the relative inclination of said first and second parts.
  • the first part may be a back of the chair and the second part may be a seat of the chair.
  • the first part may be a back of the chair and the second part may be a support of the chair.
  • the chair preferably further comprises biasing means tending to cause sliding relative movement of said sliding member and body member.
  • Figure 1 is a schematic cross-sectional elevation view of part of an office chair embodying the present invention
  • Figure 2 is a detailed cross-sectional view of a locking mechanism shown in Figure 1;
  • FIG 3 is a view along the line A-A of Figure 2.
  • an office chair 1 of the forward pivot or knee tilt type comprises a back 2 and a seat 3 attached to a seat frame 4.
  • a supporting frame 5 is mounted to a support 6 and hinged to the seat frame 4 about pivot axis 7.
  • the seat back 2 and seat 3 are urged in the direction of arrow B in Figure 1 between a rest position I and a reclined position II by means of a heavy duty torsion spring 8 which is sufficiently strong to counterbalance the weight of the occupant as the chair is reclined and to return the chair bearing the weight of the occupant to its rest position.
  • a hand wheel 9 is used to adjust the pre-tension of torsion spring 8.
  • a locking device 10 is located between the seat frame 4 and the supporting frame 5 and comprises a sliding member 11 hinged to the seat frame 4 by means of pivot pin 12, and a top plate 13 attached by a pivot pin 14 to the supporting frame 5.
  • the locking mechanism 10 is actuated by pulling on knob 15 which causes cable 16 to release the device 10 to enable the seat frame 4 to be pivoted relative to the supporting frame 5 between positions I and II (shown in dotted lines in Figure 1) in the direction of arrow C under the weight of the occupant.
  • the mechanism 10 comprises a sliding member in the form of a slide bar 11 having an engaging portion comprising a series of partially spherical recesses 17, and includes an aperture 18 for receiving pivot pin 12.
  • the slide bar 11 is received in a slot in housing 19 and slides in the slot between limits defined by dowel 20 sliding in slot 21.
  • the slot 21 serves to determine the "stroke" of the device and to prevent the slide bar 11 from being pulled out of the housing 19.
  • a top plate 13, forming part of the housing 19, has an aperture 22 through which a ball bearing 23 extends such that the ball bearing 23 is partially accommodated in the aperture 22.
  • the ball bearing 23 has a radius of curvature corresponding to that of recesses 17.
  • the actuator member 24 has an inclined portion 27 for defining a space 28 between the actuator member 24 and the top plate 13 and is adapted to slide relative to the top plate in the direction of arrow D shown in Figure 2.
  • the housing 19 also includes an aperture 29 for receiving pivot pin 14.
  • the actuator member 24 urges the ball bearing member 23 into engagement with one of the recesses 17 to prevent sliding movement of the slide bar 11 relative to the top plate 13.
  • the actuator member 24 is moved in the direction of arrow D, the space 28 is located above aperture 22.
  • sliding movement of the slide bar 11 relative to the top plate 13 causes the ball bearing 23 to rise out of engagement with recesses 17 into space 28.
  • torsion spring 8 urges the slide bar 11 in the direction of arrow E shown in Figure 2.
  • This causes one or more of the recesses 17 to urge the ball bearing 23 upwards against inclined portion 27 of actuator member 24, as a result of which the ball bearing 23 cannot move upwards, and sliding movement of the slide bar 11 relative to the top plate 13 is prevented.
  • the ball bearing 23 urges the actuator member 24 upwards against the upper plate 26 of the housing 19, as a result of which it is very difficult to slide the actuator member 26 in the direction of arrow D shown in Figure 2 by means of cable 16 to release the locking mechanism.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

L'invention concerne un dispositif de verrouillage (10) permettant de régler l'inclinaison relative de deux parties d'un fauteuil. Ce dispositif comprend un boîtier (19) possédant une plaque supérieure (13), dotée d'une ouverture (22). Une barre coulissante (11) comprend une série d'évidements (17) partiellement sphériques, disposés adjacents à l'ouverture (22). Cette ouverture (22) reçoit partiellement un roulement à billes (23) qui coopère avec l'un des évidements (17) partiellement sphériques, afin d'empêcher que la barre coulissante (11) se déplace par rapport à la plaque supérieure (13). Un élément d'actionnement (24) peut se déplacer d'une première position dans laquelle il amène le roulement à billes (23) en contact avec l'évidement (17), vers une seconde position dans laquelle il n'empêche pas le déplacement relatif par coulissement de la barre coulissante (11) et de la plaque supérieure (13). Cet élément d'actionnement (24) ne peut se déplacer d'une première position vers une seconde position, lorsque le dispositif (10) est soumis à une charge qui provoque un déplacement relatif par coulissement de la barre coulissante (11) et de la plaque supérieure (13).
PCT/GB1999/002387 1998-08-11 1999-07-22 Mecanisme de verrouillage WO2000008975A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9817339.6A GB9817339D0 (en) 1998-08-11 1998-08-11 Locking mechanism
GB9817339.6 1998-08-11

Publications (1)

Publication Number Publication Date
WO2000008975A1 true WO2000008975A1 (fr) 2000-02-24

Family

ID=10836970

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/002387 WO2000008975A1 (fr) 1998-08-11 1999-07-22 Mecanisme de verrouillage

Country Status (2)

Country Link
GB (1) GB9817339D0 (fr)
WO (1) WO2000008975A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6871909B2 (en) 2000-04-28 2005-03-29 Leggett & Platt Ltd Locking mechanism for chair and pushbutton control therefor
CN109323740A (zh) * 2017-08-01 2019-02-12 司米厨柜有限公司 一种高精度的称重复检***
KR102189085B1 (ko) * 2020-05-15 2020-12-17 조효석 좌판 위치가 조절되는 접이식 의자

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH273351A (de) * 1949-06-16 1951-02-15 Treier Josef Stellvorrichtung an Sitz- und Liegemöbeln.
US2567626A (en) * 1949-01-25 1951-09-11 Trouslot Dorothy Reclining lounge chair
GB2204356A (en) * 1987-05-07 1988-11-09 Gordon Russell Plc Locking device for mutually pivotable members
EP0393316A1 (fr) * 1989-04-21 1990-10-24 Wiesner-Hager Kg Chaise avec dossier réglable en hauteur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567626A (en) * 1949-01-25 1951-09-11 Trouslot Dorothy Reclining lounge chair
CH273351A (de) * 1949-06-16 1951-02-15 Treier Josef Stellvorrichtung an Sitz- und Liegemöbeln.
GB2204356A (en) * 1987-05-07 1988-11-09 Gordon Russell Plc Locking device for mutually pivotable members
EP0393316A1 (fr) * 1989-04-21 1990-10-24 Wiesner-Hager Kg Chaise avec dossier réglable en hauteur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6871909B2 (en) 2000-04-28 2005-03-29 Leggett & Platt Ltd Locking mechanism for chair and pushbutton control therefor
CN109323740A (zh) * 2017-08-01 2019-02-12 司米厨柜有限公司 一种高精度的称重复检***
CN109323740B (zh) * 2017-08-01 2024-02-27 司米厨柜有限公司 一种高精度的称重复检***
KR102189085B1 (ko) * 2020-05-15 2020-12-17 조효석 좌판 위치가 조절되는 접이식 의자

Also Published As

Publication number Publication date
GB9817339D0 (en) 1998-10-07

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