US3869172A - Chair reclining mechanism - Google Patents

Chair reclining mechanism Download PDF

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Publication number
US3869172A
US3869172A US374355A US37435573A US3869172A US 3869172 A US3869172 A US 3869172A US 374355 A US374355 A US 374355A US 37435573 A US37435573 A US 37435573A US 3869172 A US3869172 A US 3869172A
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US
United States
Prior art keywords
seat
base
link
lever
chair
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
Application number
US374355A
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English (en)
Inventor
Henry James
Carl B Johnson
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.)
PONTIAC FURNITURE INDUSTRIES Inc
PONTIAC FURNITURE Inc
Original Assignee
PONTIAC FURNITURE IND
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 PONTIAC FURNITURE IND filed Critical PONTIAC FURNITURE IND
Priority to US374355A priority Critical patent/US3869172A/en
Priority to CA213,794A priority patent/CA1036477A/en
Priority to JP49142596A priority patent/JPS5174755A/ja
Priority to DE2459109A priority patent/DE2459109C3/de
Publication of US3869172A publication Critical patent/US3869172A/en
Application granted granted Critical
Assigned to NEWLEN FURNITURE, INC., reassignment NEWLEN FURNITURE, INC., ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PONTIAC FURNITURE INDUSTRIES, INC.,
Assigned to PONTIAC FURNITURE, INC., reassignment PONTIAC FURNITURE, INC., CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: NEWLEN FURNITURE, INC.
Assigned to PFI LIQUIDATING CORPORATION, A CORP. OF DE. reassignment PFI LIQUIDATING CORPORATION, A CORP. OF DE. LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: PONTIAC FURNITURE INC.,
Assigned to PONTIAC FURNITURE, INC., A CORP. OF DE. reassignment PONTIAC FURNITURE, INC., A CORP. OF DE. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: P.F.I. LIQUIDATING CORPORATIO, A CORP. OF DE.
Assigned to JAMES TALCOTT BUSINESS CREDIT, INC., A CORP OF N Y reassignment JAMES TALCOTT BUSINESS CREDIT, INC., A CORP OF N Y SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POONTIAC FURNITURE INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest

Definitions

  • ABSTRACT A reclining chair mechanism having its back sup- .ported for reclining rotation and forward shifting movement relative to a base, and its seat supported by overslung links which elevate the seat front rapidly upon forward shifting movement of the seat by the reclining rotation of the hack, and wherein the seat is connected to the back in a manner such as to maintain the leverage of the occupants weight upon the seat to counteract the leverage of the occupants weight upon the back to prevent acceleration in the reclining movement and to maintain the chair in balance in various degrees of recline.
  • Reclining chair as such, are an old and welldeveloped art that teaches many arrangements for correlating the relative movement of seat and back to each other, as well as to other movable members and to the chair bases upon which they are supported.
  • the present invention is concerned, however, with a linkage of the general kind described which has distinct advantages over those earlier proposed for similar purpose in that it accomplishes previously desired objectives without the disadvantages that heretofore have been associ ated with the attainment of these objectives.
  • the prompt elevation of the forward edge of the seat as an incident to initial reclining movement of the back has been recognized as a desired ob jective, and has been earlier attained by the overslung linkage which is a component part of this invention.
  • the mechanisms heretofore developed which have incorporated overslung seat supporting linkages have usually also been characterized by a rapid shift of influence of the occupants body weight from the portion of his weight pressing down on the seat to that portion pressing rearward and downward against the back, with the undesirable development of rearward acceleration, i.e., an uncomfortable and even alarming falling-away" sensation.
  • underslung seat mechanisms which likewise elevate the seat as an incident to reclining movement of the back, and in such mechanisms, indeed, the initial forward and only then upward movement of the seat increases the effect of the occupants weight upon the seat, and more than counteracts the effect of that portion of his weight bearing rearwardly and downwardly upon the back.
  • underslung support of the seat section however, the elevation of the seat incident to the reclining of the back is much delayed as compared with that of the overslung linkage, and full recline of the back can require more effort to maintain than is conducive to repose.
  • a principal object of our invention is to utilize fully the advantage of the overslun g seat-support linkage, viz., the rapid rise of the seat, particularly at the front edge, upon initial recline of the back, but to simultaneously obviate the difficulties experienced in earlier suchattempts, viz., the rapid transfer of influence to the portion of the occupants body weight exerted against the chair back.
  • Our still further object is to provide a linkage of the kind described in which the respective linkage members are under load in all positions so that inevitable wear and consequent loosening of the riveted pivotal connections of the linkage are not made evident by rattling, as sometime occurs when recline linkages are used on rocking bases in so-called rocker-recliner chairs.
  • FIG. 1 is a perspective view of our recline linkage as seen from a rear quarter with portions of the seat bracket broken away to better illustrate the remaining parts;
  • FIG. 1A is a perspective view of only the seat bracket of the linkage, shown in full immediately above its posi- .tion in FIG. 1 so that its form will be clear;
  • FIG. 1B is an enlarged perspective view of one element of the linkage shown in the same attitude it assumes in FIG. 1 but removed from context for clearer illustration;
  • FIG. 2 is a diagrammatic side elevation of the linkage in sitting position, showing its position in the chair sug gested by the broken outline;
  • FIG. 3 is a similar diagrammatic side elevation of the linkage (and chair) in recline.
  • FIG. 1 illustrates a linkage in accordance with the invention, one of two such linkages, each a mirror image of the other, required for each chair.
  • the linkage is attached to the base frame 10 ofa chair illustrated in broken outline in the drawings, by means of a base bracket 12, and the chair back 14 is mounted on the base by means of a back-support bracket 16 whose path of movement relative to the base bracket is determined by a pair of links 18 and 20.
  • the length and angularity of the back support links 18 and 20 are such that the rotation of the chair back 14 by the reclining movement moves the lower end of the back forwardly of the base through a fixed path incident to such rotation.
  • the seat 22 of the chair is carried on a seat bracket 24 which is connected for movement conjointly with the back.
  • the seat is supported toward itsfront end by a link 26 pivoted to the seat bracket 24 and to the base bracket 12 and is supportd adjacent its rear end by its pivotal connection to a bell crank lever 28 which is itself pivotally mounted upon the forward back support link 20, and controlled in its angularity relative thereto by a control link 30 pivoted respectively to the bell crank lever 28 and to the back support bracket 16.
  • the controlled action of the bell crank lever 28 incident to reclining movement of the back is to thrust the seat forwardly, as indicated by the transition from FIG. 2 to FIG. 3.
  • the upper end of the seat support link 26 swings upwardly as well as forwardly, and pitches the front end of the seat upwardly.
  • the forward motion of the seat bracket 24 caused by its pivotal attachment to the bell crank lever 28 is the result of a dual movement, viz., the forward rotation of the forward back-support link 20, and the concurrent movement of the bell-crank lever 28 on the link counterclockwise (as seen in the drawings) caused in turn by the counterclockwise rotaion of the backsupporotbracket 16 relative to the forward backsupport link 20 and transmitted to the bell crank 28 through the control link 30.
  • the leverage of the occupants weight upon the seat 22, exerted upon the backrest bracket 16 through the bell crank lever 28 and the control link 30, is multiplied, and counteracts the influence of the rearward pressure of the greater body weight of the upper portion of the body upon the chair back 14 during the recline movement.
  • the base bracket 12 is essentially a length of angle iron with its vertical flange directed upwardly on the inner side of the bracket, and having at its rear end an upwardly inclined outrigger extension 32.
  • the horizontal flange of the base bracket 12 is provided with a number of anchoring holes 34 for securing the same to a wooden base by means of any suitable fasteners, preferably screws.
  • the aforementioned outrigger 32 of the base bracket 12 provides an appropriately positioned point of attachment for the lower end of the rear back-support link 18, the upper end of which is suitably pivoted to the lower end of the back-support bracket 16.
  • the forward back-support link 20 is boomerang shaped and pivoted at the juncture of its two arms to the upstanding flange of the base bracket 12, and at the upper end of its rearwardly and upwardly extending arm to the lower forward end of the back-support bracket 16. It will be apparent that the two links 18 and 20, constituting together with the base bracket 12 and the backsupport bracket 16 a four-bar trapezoidal linkage, fully determine the path of movement of the back-support bracket 16, which as shown by comparison of FIGS. 2 and 3, moves forwardly relative to the base bracket 12 as it is rotated counterclockwise by the reclining movement.
  • the vertical flange of the base bracket 12 and the side plate of the back support bracket 16 are in the same plane, the back support links 18 and 20 being mounted on the inside surfaces of those brackets.
  • the other, shorter arm 36 of the boomerang-shaped back-support link 20 engages a stop plate 37 secured to the underside of the base bracket 12, and thus determines the upright or sitting position of the linkage.
  • the back-support bracket 16 has an inwardly extending flange 38 to provide a mounting seat for the frame of the backrest 14, holes 40 being provided therein to secure the back to its supporting bracket by means of screws.
  • the seat support bracket 24 is a downwardly-open channel in its forward portion, thus providing opposed flanges for mounting the operating linkage of a footrest 42.
  • Such linkage being irrelevant to the subject matter shown and claimed, is omitted, and may be any suitable footrest support mechanism operated either by the reclining action of the seat and back, or by separate lever action, as may be desired in a particular application.
  • the rearward, angle portion of the seat bracket 24 (FIG. 1A) includes a depending vertical inner flange 44 of gradually increasing depth from front to rear, providing forwardly of its mid point a convenient site for the pivotal attachment of the forward support link 26.
  • the flange 44 has a circular boss stamped outwardly therefrom so that the pivot rivet at the upper end of the link 26 may be flush with the forward surface of the flange.
  • the more rearward deepest portion of the flange 44 is the point of the pivotal attachment of the seat bracket to the lower forward pivot of the bell crank lever 28, while rearwardly of its pivotal attachment to the bell crank, the vertical flange 44-of the seat support bracket recedes upwardly to a depth commensurate with its horizontal flange.
  • the forward portion of the seat bracket 24, as earlier noted, is an inverted channel whose outer flange 46 is pierced coaxially with the rivet hole for the upper pivot of the link 26, to provide a work hole 48 large enough for access by the riveting tool.
  • the upholstered seat and arms for attachment as an integral unit to the seat bracket 24.
  • This is particularly desirable in the rockerrecliner chairs for it not only eliminates the wear and noise resulting from movement of the seat within and relative to the arm frames, it also lends greater flexibility of styling as contrasted to chairs of current manufacture having a two-phase reclining movement, i.e., a first rearward shifting of the seat to extend the leg rest to an intermediate so-called TV position, essentially without substantial reclining movement of the back.
  • Such chairs by requiring fixed arm rests against which the occupant can push himself and the seat rearwardly, are limitd in their styling capabilities inasmuch as they cannot satisfactorily use a T-shaped seat cushion.
  • the sitting position of the chair is determined by the engagement of the lower arm 36 of the forward, boomerang back support link with the stop plate 37 secured to the horizontal flange of the base bracket 12. This is shown both in FIG. 1 and FIG. 2. Particularly from FIG. 2 it will be noticed that the support link 26 for the seat is inclined upwardly and rearwardly in sitting position so that the occupants weight upon the seat maintains a compressive loading not only upon the support link 26 of the seat, but also upon the control link 30. It will further be apparent that each one of the pivots of the linkage likewise remains under load in every conceivable position the linkage may occupy. This constant loading has the advantage, as earlier indicated, of eliminating clicking noise in the linkage when the same is used in a rocker-recliner, i.e.,
  • FIGS. 2 and 3 it is apparent that as the back 14 is reclined, its lower end, being immediately adjacent to the back support bracket 16, moves forwardly, as does the seat.
  • the center of gravity of the occupant is usually located in the lower abdomen.
  • the position of that center will remain relatively unchanged between the sitting and the fully reclined positions, and in intermediate positions as well. This tends to provide good inherent balance without the need either of counterbalancing springs, or of motionretarders or snubbers, suchas are often required either to compensate for over-shifting of body weight or to provide artificial retardation for movement that would otherwise be duly accelerated or abrupt.
  • said linkage means supports the back upon the base for forward shifting movement through a fixed path relative to the base as an incident to recline of the back and includes at least one back link extending upwardly from the base to back and pivoted to both for rotation forwardly on the base by the recline of the back, a seat link connecting the forward portion of the seat to the base and being inclined rearwardly and'upwardly from the base to the seat when in said sitting position, and a lever pivoted on said back link and connected by a control link to a portion of said chair other than said seat and with respect to which said back link is relatively movable upon the recline of the back, said lever being also pivoted to the rearward portion of the seat to support the seat and to move the seat forwardly relative to the base of the recline of the back.
  • control link rotates said lever to advance the pivotal attachment of the lever to the seat faster than the pivot of the lever to said back link.
  • lever is a bell crank whose pivot to said forward-most link is disposed between and above the pivotal connections of the bell'crank to said seat and to said control link, and said control link is pivoted to said back.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chairs Characterized By Structure (AREA)
US374355A 1973-06-28 1973-06-28 Chair reclining mechanism Expired - Lifetime US3869172A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US374355A US3869172A (en) 1973-06-28 1973-06-28 Chair reclining mechanism
CA213,794A CA1036477A (en) 1973-06-28 1974-11-15 Chair reclining mechanism
DE2459109A DE2459109C3 (de) 1973-06-28 1974-12-13 Beschlaggestänge für einen Lehnsessel
JP49142596A JPS5174755A (en) 1973-06-28 1974-12-13 Rikuraininguisu

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US374355A US3869172A (en) 1973-06-28 1973-06-28 Chair reclining mechanism
CA213,794A CA1036477A (en) 1973-06-28 1974-11-15 Chair reclining mechanism
DE2459109A DE2459109C3 (de) 1973-06-28 1974-12-13 Beschlaggestänge für einen Lehnsessel
JP49142596A JPS5174755A (en) 1973-06-28 1974-12-13 Rikuraininguisu

Publications (1)

Publication Number Publication Date
US3869172A true US3869172A (en) 1975-03-04

Family

ID=50391586

Family Applications (1)

Application Number Title Priority Date Filing Date
US374355A Expired - Lifetime US3869172A (en) 1973-06-28 1973-06-28 Chair reclining mechanism

Country Status (4)

Country Link
US (1) US3869172A (enrdf_load_stackoverflow)
JP (1) JPS5174755A (enrdf_load_stackoverflow)
CA (1) CA1036477A (enrdf_load_stackoverflow)
DE (1) DE2459109C3 (enrdf_load_stackoverflow)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072342A (en) * 1976-04-20 1978-02-07 Pontiac Furniture Industries, Inc. Recliner chair
US4226473A (en) * 1978-03-13 1980-10-07 Pontiac Furniture Industries, Inc. Reclining chair
US4707025A (en) * 1986-06-26 1987-11-17 Parma Corporation Rocker recliner
US4765679A (en) * 1986-05-26 1988-08-23 Drabert Sohne Gmbh & Co. Chair having a seat with front and rear seat portions being hinged to each other
US4767157A (en) * 1983-06-16 1988-08-30 Aisin Seiki Kabushiki Kaisha Seat lifter
US4796952A (en) * 1986-06-12 1989-01-10 Giancarlo Piretti Chair with hinged backrest
US5217276A (en) * 1990-10-18 1993-06-08 La-Z-Boy Chair Company Chair mechanism
US5271660A (en) * 1990-10-18 1993-12-21 La-Z-Boy Chair Co. Reclining sofa
US5292170A (en) * 1991-08-06 1994-03-08 La-Z-Boy Chair Co. Recliner assist apparatus
US5358308A (en) * 1992-06-18 1994-10-25 Bertrand Faure Automobile "Bfa" Vehicle seats having multiple adjustments
US5570930A (en) * 1993-08-09 1996-11-05 La-Z-Boy Chair Company Recliner chair seat assembly and method of upholstering
US5890765A (en) * 1996-06-07 1999-04-06 La-Z-Boy Incorporated Health care reclining chair
US6109694A (en) * 1999-06-01 2000-08-29 Hon Technololgy, Inc. Chair with four-bar linkage for self-adjusting back tension
US20060181127A1 (en) * 2000-09-28 2006-08-17 Formway Furniture Limited Reclinable chair
US20080136239A1 (en) * 2005-06-26 2008-06-12 Bock 1 Gmbh & Co. Kg Synchronizing mechanism for a chair
EP2481316A1 (en) * 2011-01-30 2012-08-01 Jianhua Fu Chair
US20120246874A1 (en) * 2009-12-21 2012-10-04 Beuth Hochschule Fur Technik Berlin Components designed to be load-adaptive
US9351890B2 (en) 2013-03-15 2016-05-31 Stryker Corporation Medical support apparatus
US10729246B2 (en) 2017-12-21 2020-08-04 Stryker Corporation Person support apparatus with shear-reducing pivot assembly
US11279264B2 (en) 2019-11-22 2022-03-22 Grammer Ag Vehicle seat
US11440443B2 (en) * 2019-10-29 2022-09-13 Grammer Ag Vehicle seat
US11589678B2 (en) 2019-01-17 2023-02-28 Hni Technologies Inc. Chairs including flexible frames

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492407A (en) * 1982-07-19 1985-01-08 Syntex (U.S.A.) Inc. Patient support and transverse motion linkage therefor
JPS60160910A (ja) * 1984-01-31 1985-08-22 株式会社タチエス 車両等の座席
JPS6395206U (enrdf_load_stackoverflow) * 1986-12-11 1988-06-20
DE19634665A1 (de) * 1996-08-28 1998-03-05 Jungjohann Thomas Sitzmöbelelement, insbesondere Polstermöbelelement, mit einer gekoppelten Rückenlehnen- und Sitzverstellung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US799128A (en) * 1904-07-02 1905-09-12 John F Wilmot Adjustable reclining-chair.
US2240850A (en) * 1938-10-06 1941-05-06 Floral City Furniture Co Chair
US2746520A (en) * 1952-04-25 1956-05-22 Ducrot Albert Reclining chair
US2764224A (en) * 1953-01-28 1956-09-25 Maurer Pierre Reclining chair with foot rest articulation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5016988B2 (enrdf_load_stackoverflow) * 1971-09-29 1975-06-17

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US799128A (en) * 1904-07-02 1905-09-12 John F Wilmot Adjustable reclining-chair.
US2240850A (en) * 1938-10-06 1941-05-06 Floral City Furniture Co Chair
US2746520A (en) * 1952-04-25 1956-05-22 Ducrot Albert Reclining chair
US2764224A (en) * 1953-01-28 1956-09-25 Maurer Pierre Reclining chair with foot rest articulation

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072342A (en) * 1976-04-20 1978-02-07 Pontiac Furniture Industries, Inc. Recliner chair
US4226473A (en) * 1978-03-13 1980-10-07 Pontiac Furniture Industries, Inc. Reclining chair
US4767157A (en) * 1983-06-16 1988-08-30 Aisin Seiki Kabushiki Kaisha Seat lifter
US4765679A (en) * 1986-05-26 1988-08-23 Drabert Sohne Gmbh & Co. Chair having a seat with front and rear seat portions being hinged to each other
US4796952A (en) * 1986-06-12 1989-01-10 Giancarlo Piretti Chair with hinged backrest
US4707025A (en) * 1986-06-26 1987-11-17 Parma Corporation Rocker recliner
US5217276A (en) * 1990-10-18 1993-06-08 La-Z-Boy Chair Company Chair mechanism
US5271660A (en) * 1990-10-18 1993-12-21 La-Z-Boy Chair Co. Reclining sofa
US5292170A (en) * 1991-08-06 1994-03-08 La-Z-Boy Chair Co. Recliner assist apparatus
US5358308A (en) * 1992-06-18 1994-10-25 Bertrand Faure Automobile "Bfa" Vehicle seats having multiple adjustments
US5570930A (en) * 1993-08-09 1996-11-05 La-Z-Boy Chair Company Recliner chair seat assembly and method of upholstering
US5890765A (en) * 1996-06-07 1999-04-06 La-Z-Boy Incorporated Health care reclining chair
US6109694A (en) * 1999-06-01 2000-08-29 Hon Technololgy, Inc. Chair with four-bar linkage for self-adjusting back tension
US20060181127A1 (en) * 2000-09-28 2006-08-17 Formway Furniture Limited Reclinable chair
US7441839B2 (en) 2000-09-28 2008-10-28 Formway Furniture Limited Reclinable chair
US7798573B2 (en) 2000-09-28 2010-09-21 Formway Furniture Limited Reclinable chair
US20080136239A1 (en) * 2005-06-26 2008-06-12 Bock 1 Gmbh & Co. Kg Synchronizing mechanism for a chair
US20120246874A1 (en) * 2009-12-21 2012-10-04 Beuth Hochschule Fur Technik Berlin Components designed to be load-adaptive
EP2481316A1 (en) * 2011-01-30 2012-08-01 Jianhua Fu Chair
US9351890B2 (en) 2013-03-15 2016-05-31 Stryker Corporation Medical support apparatus
US10729246B2 (en) 2017-12-21 2020-08-04 Stryker Corporation Person support apparatus with shear-reducing pivot assembly
US11589678B2 (en) 2019-01-17 2023-02-28 Hni Technologies Inc. Chairs including flexible frames
US12075921B2 (en) 2019-01-17 2024-09-03 Hni Technologies Inc. Chairs including flexible frames
US11440443B2 (en) * 2019-10-29 2022-09-13 Grammer Ag Vehicle seat
US11279264B2 (en) 2019-11-22 2022-03-22 Grammer Ag Vehicle seat

Also Published As

Publication number Publication date
JPS5174755A (en) 1976-06-28
JPS545749B2 (enrdf_load_stackoverflow) 1979-03-20
DE2459109A1 (de) 1976-06-24
DE2459109C3 (de) 1981-02-26
DE2459109B2 (de) 1980-05-29
CA1036477A (en) 1978-08-15

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Owner name: NEWLEN FURNITURE, INC.,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PONTIAC FURNITURE INDUSTRIES, INC.,;REEL/FRAME:003845/0476

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