US3710418A - Chair having a back rest and means for adjusting the inclination thereof - Google Patents

Chair having a back rest and means for adjusting the inclination thereof Download PDF

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Publication number
US3710418A
US3710418A US00189353A US3710418DA US3710418A US 3710418 A US3710418 A US 3710418A US 00189353 A US00189353 A US 00189353A US 3710418D A US3710418D A US 3710418DA US 3710418 A US3710418 A US 3710418A
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United States
Prior art keywords
shaft
locking pawls
bearing member
internal teeth
set forth
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Expired - Lifetime
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US00189353A
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English (en)
Inventor
W Kratzer
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.)
Wiesner Hager KG
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Wiesner Hager KG
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Application filed by Wiesner Hager KG filed Critical Wiesner Hager KG
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Publication of US3710418A publication Critical patent/US3710418A/en
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    • 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

Definitions

  • a pocket member is fixed or adapted to be fixed to the seat plate of a chair.
  • a horizontal shaft is rotatably mounted in said pocket member.
  • a bearing member and a pinion are corotationally mounted on said shaft.
  • a holder is pivoted to said pocket member on a horizontal axis and connected or adapted to be connected to the back rest of said chair.
  • a gear segment is carried by said holder and in mesh with said pinion.
  • a nonrotatable ratchet ring is coaxial with said shaft and secured to said pocket member and carries internal teeth.
  • Two symmetrically opposite locking pawls are pivoted to said bearing member on axes which are parallel to said shaft.
  • Each of said locking pawls has a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one, direction, and the other of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in the opposite, and only in the opposite, direction.
  • Spring means urge said locking pawls into engagement with said internal teeth.
  • Two cam followers are provided, each of which is generally parallel to said shaft and carried by one of said locking pawls.
  • a hand wheel is freely rotatably mounted on said shaft and provided with first cam faces which are adapted to engage said cam follower of that of said locking pawls which normally holds said bearing member against rotation in the direction in which the hand wheel is being rotated, and with two spaced apart second cam faces.
  • An additional cam follower is carried by said bearing member and extends with a backlash between said second cam faces.
  • SHEET 1 [IF 3 PATENTEDJAM 16 ms 3.710 418 sum 2 0F 3 CHAIR HAVING A BACK REST AND MEANS FOR ADJUSTING THE INCLINATION THEREOF
  • This invention relates to a device for adjusting the inclination of the back rest of chairs, particularly of office chairs, which device comprises a pocket member, which is firmly connected to the seat plate and in which a holder for the rest carrier is pivoted on a horizontal axis.
  • the rest carrier In known devices for adjusting the inclination of the back rest of office chairs, the rest carrier is clamped together with the holder in the pocket member. Clamp screws are provided in most cases for this purpose and hold the rest in its adjusted position. When. the clamp screws have been loosened, the holder together with the rest carrier is pivotally movable about a horizontal axis. In most cases, the rest carrier is slidably mounted in the holder and is thus adjustable in height. The tightening of the clamp screws will hold the rest carrier in the position to which it has been adjusted in height and inclination. All these designs have the disadvantage that the back rest can be adjusted only when it is under no load. It cannot be adjusted when a person is sitting on the chair because the rest carrier must be held by hand when the clamp is to be released.
  • the invention accomplishes the above-mentioned object essentially in that the holder comprises in known manner a gear segment, which is in mesh with a pinion that is corotationally mounted on a shaft, a bearing member is corotationally mounted on said shaft, two symmetrically oppositely disposed locking pawls having toothed outer sides are mounted in said bearing member for pivotal movement in a plane that is normal to the shaft, a nonrotatable ratchet ring having internal teeth is coaxial with the shaft, the toothed sides of the pawls are spring-urged against said internal teeth, each pawl blocks the bearing member against a rotation in which the other pawl permits of a rotation of such bearing member, each pawl comprises a pin or the like, which is parallel to the shaft, a hand wheel is freely rotatably mounted on the shaft and operable to impart by cam faces of the hand wheel and by said pins or the like a pivotal movement against the spring force to that pawl
  • the rest carrier is held in its adjusted position since the bearing member is held against rotation by means of the locking pawls forced against the nonrotatable ratchet ring.
  • the hand wheel must be rotated to disengage the lockingpawl which blocks the bearing member against rotation in the direction of rotation of the hand wheel. Now a cam face of the hand wheel can act on the pin of the bearing member to rotate thelatter. When the hand wheel is released after it has been rotated, the locking pawl will reengage and the rest will be held in its new position.
  • the design provided according to the invention is such that the operation of the device does not give rise to particularly strong force's so that plastics material may be used in making the device.
  • the ratchet ring is mounted on a disc or the like, which has an extension that is preferably square in cross-section and extends into a mating aperture of the pocket member and is formed with a through bore in which the bearing member is rotatably mounted.
  • the ratchet ring With this special design of the ratchet ring, the same can be nonrotatably secured to the pocket member with simple means. No difficulties are involved in the connection between the pocket member, which is made of metal, and the ratchet ring consisting of plastics material.
  • the bearing member may also be made of plastics material and can bemounted in a simple manner in the square extension of the disc in this arrangement.
  • the assembling of the device will be particularly .easy because the pinion fitted on the shaft can be conveniently inserted into the pocket member through said square aperture. The mounting will be further facilitated if the pinion has a bearing extension, which is mounted in the pocket member.
  • thebearing member has preferably two circular apertures for receiving the: complementary end portions of the locking pawls.
  • the cam faces of the hand wheel are defined by a cross-shaped aperture.
  • the wall faces defining the cross-shaped aperture form the cam faces for engaging the pins or the like, ,which are disposed at the corners of an isosceles triangle on the locking pawls and the bearing member.
  • the invention teaches to provide a common spring for urging the locking pawls outwardly. This permits of a simplification of the structure whereas an adverse affect on the functional reliability need not be feared.
  • FIG. 1 shows the device according .to the invention in a longitudinal sectional view taken through the pocket member
  • FIG. 2 is an enlarged transverse sectional view taken on line II-II in FIG. 1.
  • FIG. 3 is a side elevation showing the device with the hand wheel removed and FIG. 4 is a view showing the underside of the hand wheel.
  • a pocket member 2 is welded to the seat plate 1 of an office chair.
  • a holder 3 is pivoted in said pocket member on a horizontal axis 4.
  • the holder 3 comprises a gear segment 5, which is in mesh with a pinion 6.
  • a carrier 7 for the back rest of the chair is slidably mounted in the holder 3.
  • a spring-loaded detent member 8 is provided and serves to fix the carrier 7 in the position to which it has been adjusted in height.
  • the pinion 6 comprises a bearing extension 9 (FIG. 2), which is mounted in the pocket member 2.
  • the pinion 6 is fitted on a hexagonal shaft 10, which carries a bearing member 11.
  • the bearing member 11 is mounted in a square extension 12 of a disc, which carries a ratchet ring 13.
  • the square extension of the disc for the ratchet ring 13 extends into a complementary aperture formed in the pocket member 2, and the ratchet ring 13 is thus nonrotatably held in said pocket member.
  • Two locking pawls 15 and 16 are mounted in respective circular apertures 14 of the bearing member 11 and have a toothed outer side each.
  • a spring 17 urged the outer side of each locking pawl 15 and 16 against the internal teeth of the ratchet ring 13.
  • Each locking pawl is provided with a pin 18, which is parallel to the shaft.
  • Another pin 19 is carried by the bearing member 1 1.
  • a hand wheel 20 is freely rotatably mounted on the shaft but is not removable therefrom and formed with cam faces 21, 22 for engaging the pins 18 of the pawls l6 and 15.
  • the pin 19 of the bearing member 11 extends between'two cam faces 24, 25 of the hand wheel 20.
  • the pin 18 of the locking pawl 16 will be engaged and driven by the cam face 22 so that the locking pawl 16 releases the bearing member 11 to rotate in the clockwise sense. This is so because the locking pawl prevents only a rotation in the clockwise sense and for this reason does not obstruct the present movement.
  • the cam face 25 imparts a rotation to the pin 19 and by the bearing member 11 transmits the rotation to the shaft, the pinion and the holder 3 so that the inclination of the back rest is adjusted.
  • a device for adjusting the inclination of a back rest of a chair having a seat plate which device comprises a pocket member adapted to be fixed to said seat plate,
  • a holder pivoted to said pocket member on a horizontal axis and adapted to be connected to said back rest
  • a nonrotatable ratchet ring which is coaxial with said shaft and secured to said pocket member and carries internal teeth
  • each of said locking pawls having a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one,
  • a hand wheel which is freely rotatably mounted on said shaft and provided with first cam faces which are adapted to engage said cam follower of that of said locking pawls which normally holds said hearing member against rotation in the direction in which the hand wheel is being rotated, and with two spaced apart second cam faces, and an additional cam follower carried by said bearing member and extending with a backlash between said second cam faces.
  • said cam followers carried by said locking pawls consist of pins.
  • said ratchet ring is carried by a ring carrier having an extension formed with a through bore, said pocket member is formed with an aperture which mates and receives said extension, and said bearing member is rotatably mounted in said through bore.
  • said ring carrier consists of a disc.
  • said spring means consist of a single spring urging said locking pawls toward said internal teeth.
  • a device for adjusting the inclination of said back rest which device comprises:
  • a holder pivoted to said pocket member on a horizontal axis and connected to said back rest carrier
  • a nonrotatable ratchet ring which is coaxial with said shaft and secured to said pocket member and carries internal teeth
  • each of said locking pawls having a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one, direction, and the other of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in the opposite, and only in the opposite, direction,

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Clamps And Clips (AREA)
US00189353A 1970-10-30 1971-10-14 Chair having a back rest and means for adjusting the inclination thereof Expired - Lifetime US3710418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT976670A AT296532B (de) 1970-10-30 1970-10-30 Vorrichtung zur Neigungsverstellung der Rückenlehne von Sesseln, insbesondere von Bürosesseln

Publications (1)

Publication Number Publication Date
US3710418A true US3710418A (en) 1973-01-16

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ID=3617082

Family Applications (1)

Application Number Title Priority Date Filing Date
US00189353A Expired - Lifetime US3710418A (en) 1970-10-30 1971-10-14 Chair having a back rest and means for adjusting the inclination thereof

Country Status (12)

Country Link
US (1) US3710418A (es)
AT (1) AT296532B (es)
BE (1) BE774060A (es)
CH (1) CH526288A (es)
DE (1) DE2149482A1 (es)
DK (1) DK132157C (es)
ES (1) ES173733Y (es)
FR (1) FR2111360A5 (es)
GB (1) GB1324916A (es)
LU (1) LU63994A1 (es)
NL (1) NL7114973A (es)
SE (1) SE365938B (es)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905064A (en) * 1974-04-08 1975-09-16 Scharwaechter Kg Combined door stopper and hinge assembly
US4035021A (en) * 1976-03-17 1977-07-12 General Motors Corporation Vehicle seat back reclining mechanism
US4372609A (en) * 1979-11-14 1983-02-08 Societe Industrielle Bertrand Faure Vehicle seats comprising a shell-shaped frame
US4386805A (en) * 1980-03-26 1983-06-07 Societe Industrielle Bertrand Faure Seats with an adjustable-tilt back-rest
US4657303A (en) * 1985-11-04 1987-04-14 Canadian A.S.E. Limited Incremental adjustment device for seat assemblies
WO2003103455A1 (en) * 2002-05-24 2003-12-18 Ivo Popovic Adaptable massage working chair
US20100148556A1 (en) * 2008-12-16 2010-06-17 Kuo-Ching Chou Angle-Adjusting Structure for Backrest of Chair
US20100194156A1 (en) * 2007-10-16 2010-08-05 Chun Choo Kim Angle adjusting device for bicycle saddle
US20120017398A1 (en) * 2010-06-30 2012-01-26 Liang Huachun Two-Tooth Hinge
US8875347B2 (en) * 2012-12-21 2014-11-04 Taco Metals; Inc. Hinge employing a ratchet for an upholstery seat
US20150176640A1 (en) * 2012-12-21 2015-06-25 Philip J. Serocki Hinge Employing a Ratchet for An Upholstery Seat
US20180229629A1 (en) * 2015-09-04 2018-08-16 Jaguar Land Rover Limited Vehicle seat assembly
CN109555564A (zh) * 2019-01-25 2019-04-02 沈阳航空航天大学 含磁铁可调节刷丝束与转子面径向间隙的刷式密封结构
CN112477100A (zh) * 2020-11-23 2021-03-12 江西膜力胜光电科技有限公司 一种手机钢化膜辅助贴膜设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2443058B (en) * 2006-09-30 2011-09-21 Huang Yucheng Adjustment apparatus for a swivel chair

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1927491A (en) * 1932-03-09 1933-09-19 Tan Sad Chair Co 1931 Ltd Backrest or support for alpha seat or the like
US1984549A (en) * 1932-05-31 1934-12-18 Burroughs Adding Machine Co Chair
US2941583A (en) * 1957-09-05 1960-06-21 L A Young Spring & Wire Corp Reclining seat
US3299466A (en) * 1963-10-12 1967-01-24 Keiper Fa F Joint fitting for adjustable backrest
US3401979A (en) * 1966-07-19 1968-09-17 Putsch Friedrich W Articulated mount for seats, particularly motor vehicle seats

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1927491A (en) * 1932-03-09 1933-09-19 Tan Sad Chair Co 1931 Ltd Backrest or support for alpha seat or the like
US1984549A (en) * 1932-05-31 1934-12-18 Burroughs Adding Machine Co Chair
US2941583A (en) * 1957-09-05 1960-06-21 L A Young Spring & Wire Corp Reclining seat
US3299466A (en) * 1963-10-12 1967-01-24 Keiper Fa F Joint fitting for adjustable backrest
US3401979A (en) * 1966-07-19 1968-09-17 Putsch Friedrich W Articulated mount for seats, particularly motor vehicle seats

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905064A (en) * 1974-04-08 1975-09-16 Scharwaechter Kg Combined door stopper and hinge assembly
US4035021A (en) * 1976-03-17 1977-07-12 General Motors Corporation Vehicle seat back reclining mechanism
US4372609A (en) * 1979-11-14 1983-02-08 Societe Industrielle Bertrand Faure Vehicle seats comprising a shell-shaped frame
US4386805A (en) * 1980-03-26 1983-06-07 Societe Industrielle Bertrand Faure Seats with an adjustable-tilt back-rest
US4657303A (en) * 1985-11-04 1987-04-14 Canadian A.S.E. Limited Incremental adjustment device for seat assemblies
WO2003103455A1 (en) * 2002-05-24 2003-12-18 Ivo Popovic Adaptable massage working chair
US8424963B2 (en) * 2007-10-16 2013-04-23 Chun Choo Kim Angle adjusting device for bicycle saddle
US20100194156A1 (en) * 2007-10-16 2010-08-05 Chun Choo Kim Angle adjusting device for bicycle saddle
US7802847B2 (en) * 2008-12-16 2010-09-28 Kuo-Ching Chou Angle-adjusting structure for backrest of chair
US20100148556A1 (en) * 2008-12-16 2010-06-17 Kuo-Ching Chou Angle-Adjusting Structure for Backrest of Chair
US20120017398A1 (en) * 2010-06-30 2012-01-26 Liang Huachun Two-Tooth Hinge
US8875347B2 (en) * 2012-12-21 2014-11-04 Taco Metals; Inc. Hinge employing a ratchet for an upholstery seat
US20150176640A1 (en) * 2012-12-21 2015-06-25 Philip J. Serocki Hinge Employing a Ratchet for An Upholstery Seat
US9249827B2 (en) * 2012-12-21 2016-02-02 Taco Metals, Inc. Hinge employing a ratchet for an upholstery seat
US20180229629A1 (en) * 2015-09-04 2018-08-16 Jaguar Land Rover Limited Vehicle seat assembly
CN109555564A (zh) * 2019-01-25 2019-04-02 沈阳航空航天大学 含磁铁可调节刷丝束与转子面径向间隙的刷式密封结构
CN109555564B (zh) * 2019-01-25 2023-08-29 沈阳航空航天大学 含磁铁可调节刷丝束与转子面径向间隙的刷式密封结构
CN112477100A (zh) * 2020-11-23 2021-03-12 江西膜力胜光电科技有限公司 一种手机钢化膜辅助贴膜设备

Also Published As

Publication number Publication date
DE2149482A1 (de) 1972-05-04
CH526288A (de) 1972-08-15
GB1324916A (en) 1973-07-25
NL7114973A (es) 1972-05-03
ES173733Y (es) 1972-10-16
DK132157B (da) 1975-11-03
ES173733U (es) 1972-03-16
BE774060A (fr) 1972-02-14
LU63994A1 (es) 1972-04-12
FR2111360A5 (es) 1972-06-02
SE365938B (es) 1974-04-08
AT296532B (de) 1972-02-25
DK132157C (da) 1976-03-29

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