US1932618A - Adjustable backrest or support for alpha seat - Google Patents

Adjustable backrest or support for alpha seat Download PDF

Info

Publication number
US1932618A
US1932618A US610168A US61016832A US1932618A US 1932618 A US1932618 A US 1932618A US 610168 A US610168 A US 610168A US 61016832 A US61016832 A US 61016832A US 1932618 A US1932618 A US 1932618A
Authority
US
United States
Prior art keywords
seat
backrest
link
support
protuberance
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
US610168A
Other languages
English (en)
Inventor
Gabb Archibald Horsfield
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.)
Tan Sad Chair Co 1931 Ltd
Original Assignee
Tan Sad Chair Co 1931 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 Tan Sad Chair Co 1931 Ltd filed Critical Tan Sad Chair Co 1931 Ltd
Application granted granted Critical
Publication of US1932618A publication Critical patent/US1932618A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 inclination
    • A47C1/027—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable inclination by means of clamps or friction locking members
    • 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—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/402—Supports for the head or the back for the back adjustable in height
    • 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—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/44—Supports for the head or the back for the back with elastically-mounted frame
    • A47C7/443—Supports for the head or the back for the back with elastically-mounted frame with coil springs

Definitions

  • the present invention has relation to an adjustable backrest or support for a seat, and has for its object to provide such a devicewhich is capable of a considerable degree of adjustment 5 both vertically. and angularly, which is readily manipulated and provides for a correct sitting posture of the user.
  • the backrest is supported upon a normally vertical or substantially vertical arm adapted to be adjusted about an arcuate, cam or equivalent face provided upon a fixed protuberance and be maintained in its position of adjustment by means of a clamp associated with the aforesaid protuberance and a pivotal link.
  • the vertical adjustment of the backrest is obtained by releasing the clampand vertically sliding the arm in relation to the protuberance, whereas inclination is obtained by swinging the arm with a tangential movement upon the arcuate cam or equivalent face, the clamp being correspondingly swung upon its anchoring linkage until it takes effect at the tangential point of contact of the arm whereby it is tightened for retentive purposes.
  • Figure 1 is an elevational view and Figure 2 a plan view of an adjustable backrest or support for a seat, constructed in accordance with the present invention.
  • the frame a of the seat is provided with an oblong protuberance b which extends rearwardly and which terminates in a central nose 72
  • Both the protuberance andthe nose terminate in arcuate, cam orequivalent formations b b the curvature of such formations being struck advantageously from a point 0 adjacent the centre of the seat to which a U-shaped link 0 is pivotally anchored so that the yoke c is adapted to follow the contour b of the nose when the link is swung or pivoted.
  • the pivotal movement of the link 0 is limited in its upward and downward swinging movement by upper and lower projections a (1 provided upon the frame a, and the upward movement of the link may be assisted by a spring d.
  • One limb of the U-shaped link 0 is provided with a hand screw e at a position adjacent the yoke (2
  • the backrest support comprises an elongated U-shaped member 1 constructed of fiat strip metal the limbs of which are adapted to slidingly operate on each side of the nose b and within the U-shaped pivotal link 0.
  • the upper extremity of the backrest support I may be provided with a pivotal or swivel back support I and the lower extremity be constructed of loop formation to prevent its complete separation from the apparatus in an upward direction.
  • the hand screw e In operation in order to secure the backrest the hand screw e is tightened whereby the limbs constituting the backrest areeifectively clamped to the nose b and any rearward movement prevented by the adjacent part of the backrest engaging the cam face 13
  • the hand screw e In order to obtain vertical adjustment the hand screw e is released and the backrest f slid Vertically upwardly or downwardly as may be desired,
  • the U-shaped link 0 pivoted to the protuberance is swung to an appropriate angle by the utilization of the hand screw e whereby the backrest is caused to obtain a different tangential relationship with the arcuate cam or equivalent faces on the protuberance.
  • the correct adjustment both with respect to elevation and inclination having been obtained, the hand screw is clamped to tighten and set the mechanism.
  • An adjustable backrest for a seat comprising a protuberance upon the seat frame having an arcuate-shaped extremity, a nose of reduced width upon said protuberance, a U-shaped link pivoted to said protuberance, a supporting arm of a duplex character operating between the nose and the arms of the link adjacent the arcuate extremity, and a clamping screw upon the link adapted to clamp the arm against the nose in its position of adjustment.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
US610168A 1931-11-10 1932-05-09 Adjustable backrest or support for alpha seat Expired - Lifetime US1932618A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31103/31A GB383407A (en) 1931-11-10 1931-11-10 An improved adjustable backrest or back support for a seat

Publications (1)

Publication Number Publication Date
US1932618A true US1932618A (en) 1933-10-31

Family

ID=10318014

Family Applications (1)

Application Number Title Priority Date Filing Date
US610168A Expired - Lifetime US1932618A (en) 1931-11-10 1932-05-09 Adjustable backrest or support for alpha seat

Country Status (4)

Country Link
US (1) US1932618A (fr)
DE (1) DE581899C (fr)
FR (1) FR737228A (fr)
GB (1) GB383407A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497580A (en) * 1945-03-24 1950-02-14 John Overton Shaw Adjustable photographer's posing chair
US3709535A (en) * 1971-01-18 1973-01-09 H Rothermel Hinge iron for posture chair

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK83914C (da) * 1954-02-24 1957-11-18 Einar Rustad Fa Kontorstol.
US4913492A (en) * 1989-04-03 1990-04-03 Sears Manufacturing Company Recliner for vehicle seat
CA2089694A1 (fr) * 1992-07-23 1994-01-24 Faultless-Doerner Manufacturing Inc. Mecanisme a ressort permettant d'incliner le dossier d'un siege par rapport a un mecanisme de basculement
US5356200A (en) * 1992-10-23 1994-10-18 Doerner Products Ltd. Unitary brake for a chair tilt mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497580A (en) * 1945-03-24 1950-02-14 John Overton Shaw Adjustable photographer's posing chair
US3709535A (en) * 1971-01-18 1973-01-09 H Rothermel Hinge iron for posture chair

Also Published As

Publication number Publication date
DE581899C (de) 1933-08-04
GB383407A (en) 1932-11-17
FR737228A (fr) 1932-12-08

Similar Documents

Publication Publication Date Title
US3952989A (en) Adjustable reading material stand
US2709563A (en) Tray supporting member
GB1168927A (en) Improvements relating to Seats
GB1497759A (en) Chair having a tiltable back-rest and two pivotal leg supports
US1932618A (en) Adjustable backrest or support for alpha seat
DE58901223D1 (de) Stuhl, insbesondere arbeits- oder buerostuhl.
US2506824A (en) Pole and rod holding device
US1970874A (en) School furniture
GB381086A (en) An improved backrest or back support for a seat or the like
US2714418A (en) Contour chair with movable padded seat
GB785194A (en) Improvements in and relating to tilting chairs
US2172797A (en) Adjustable head support
US1930867A (en) Chair head rest
GB476840A (en) Improvements in chairs
GB605957A (en) A reclining article of furniture
GB551808A (en) Improvements in adjustable seats
GB1011267A (en) Chair with double pivot spring assembly
US2534491A (en) Drapery fixture
US1796949A (en) Adjustable chair
DK200100230A (da) Stol, fortrinsvis kørestol
US1938226A (en) Chair
US2319202A (en) School desk seat and support therefor
US2463042A (en) Combined back rest and fish pole holder
GB430517A (en) An improved backrest or support for a chair, seat, or the like
GB726015A (en) Improvements in or relating to chair