US2590718A - Adjustable chair back - Google Patents

Adjustable chair back Download PDF

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Publication number
US2590718A
US2590718A US2512A US251248A US2590718A US 2590718 A US2590718 A US 2590718A US 2512 A US2512 A US 2512A US 251248 A US251248 A US 251248A US 2590718 A US2590718 A US 2590718A
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United States
Prior art keywords
post
chair back
handle
disk
arm
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Expired - Lifetime
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US2512A
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Lundquist Carl Ernst Edward
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Individual
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Individual
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Publication date
Priority claimed from US533370A external-priority patent/US2476258A/en
Application filed by Individual filed Critical Individual
Priority to US2512A priority Critical patent/US2590718A/en
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Publication of US2590718A publication Critical patent/US2590718A/en
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/022Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024Reclining 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
    • A47C1/027Reclining 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 clamps or friction locking members
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • A47C7/402Support for the head or the back for the back adjustable in height

Definitions

  • the present invention relates to adjustable chairs having a frame, a seat supported thereby and means for connecting said seat with a chair back adjustably as to its height and angularity.
  • a further object of the invention is to provide connecting means ensuring that the chair back when being adjusted is guided in an unfailing manner and after the adjustment effectively secured against displacement as to its height or angularity.
  • Fig. 1 is a perspective view of an ofiice chair with an adjustable back constructed in accordance with the invention
  • Fig. 2 shows on an enlarged scale the guiding and locking device for the adjustable back in section on the lines II-II of Figs. 1 and 3, and
  • Fig. 3 is a view, partly sectioned, on the line III-III of Fig. 2.
  • the chair comprises a lower frame 16, the threaded tubular center of which is engaged by a spindle 36 carrying an upper frame [2 for the seat 40, which frame is freely rotatable on said spindle and consists of a central portion 34 and outwardly bent brace portions 38.
  • an arm 64 Extending through a slot in one of the said brace portions 38 is an arm 64, which is preferably rigidly connected with the central portion 34 of the same brace, for instance by welding.
  • This arm carries on its other end a gear rim 6'6.
  • Parallel to said gear rim is a clutch disk 16 welded to a hub and provided on its periphery with teeth 12 engaging the teeth of the gear rim 66.
  • a guide element for a post 18, such as a cover 14, is connected to the clutch disk 19, said cover being provided with apertures 16 for the post, which latter carries a chair back 80.
  • the post 18 is provided with a longitudinally extending slot 82 engaged by an element 84 of rectangular cross section.
  • a bolt 86 extending through the hub of the disk 19 and through a central aperture of restricted diameter in the center of the gear rim 66.
  • a nut 88 is screwed onto the end portion of the bolt 86, said end portion having a restricted diameter, so that the gear rim 66 is pressed between the nut and a shoulder 89 of the bolt.
  • the bifurcated end portion of a handle 90 embraces the element 84 and is supported thereon by means of a pin 92.
  • This bifurcated end portion is formed as an eccentric, the eccentric surface 94 of which bears on a disk 96, which, in turn, bears on the post 18. In the position shown in Figs.
  • the gear rim 16 is locked by the disk 66, that is to say, by turning the handle 90 upwards it moves the disk 16 to the left as viewed in Fig. 2 through the medium of the disk 96 and the post I8 in such a manner that the teeth of the two geared elements 66 and I9 engage each other against the action of the spring 98 located therebetween.
  • the eccentric surface 94 thus forces the disk 96 against the post 18 so as to hold it fast.
  • This angular movement may be limited by means of a projection 91 on the disk 10, said projection being brought into contact with the arm 64 when the chair back is lowered.
  • the post 18 has also been released, so that the same may be moved in its longitudinal direction for the adjustment of the height of the chair back 86.
  • the handle 90 which is preferably directed upwardly for the purpose of facilitating an adjustment of the chair back in locked position, cooperates with the element 84 positively guided by the guide 82 of the post 18, the handle will always take a position parallel to the post.
  • a seat supporting frame an arm secured to and extending rearwardly from said frame, a first gear member rigidly secured to said arm, a longitudinally slotted back supporting post, a second gear member on one side of said post and an aper- 55 tured retaining member on the other side of said post rigidly fixed to said second gear member to provide a guide for said post, said post being longitudinally slidable and non-rotatable relative to said guide, a pressure plate located in the aperture in said retaining member, and means for locking said post against movement relative to said arm comprising a locking element fixed to said first gear member and extending through said second gear member, the slot in said post and said pressure plate, and a handle pivoted on said locking member, said handle having a cam located to bear on said pressure plate to draw said gear members into locking engagement and to grip said post between said second gear member and said pressure plate.
  • said locking member includes a block non-rogo tatable in said slot, said handle being pivoted to said block to turn in a plane extending longitudinally of said post.

Description

March 25, 1 c. E. E. LUNDQUIST ADJUSTABLE CHAIR BACK Original Filed April 29, 1944 Patented Mar. 25, 1952 UNITED STATES PATENT OFFICE ADJUSTABLE CHAIR BACK Carl Ernst Edward Lundquist, Stockholm, Sweden Original application April 29, 1944, Serial No.
533,370. Divided and this application January 15, 1948, Serial No. 2,512. In Sweden May 12,
3 Claims. ((31. 155-157) This application is a division of my copending application Serial Number 533,370, filed April 29, 1944, now Patent 2,476,258 granted July 12, 1949.
The present invention relates to adjustable chairs having a frame, a seat supported thereby and means for connecting said seat with a chair back adjustably as to its height and angularity.
It is an object of the invention to provide connecting means of this kind adapted to perform the adjusting operation in a very easy and handy way.
A further object of the invention is to provide connecting means ensuring that the chair back when being adjusted is guided in an unfailing manner and after the adjustment effectively secured against displacement as to its height or angularity.
Further objects and advantages of the invention will be apparent from the following description considered in connection with the accompanying drawings, which form a part of this specification, and of which:
Fig. 1 is a perspective view of an ofiice chair with an adjustable back constructed in accordance with the invention,
Fig. 2 shows on an enlarged scale the guiding and locking device for the adjustable back in section on the lines II-II of Figs. 1 and 3, and
Fig. 3 is a view, partly sectioned, on the line III-III of Fig. 2.
In the embodiment illustrated, the chair comprises a lower frame 16, the threaded tubular center of which is engaged by a spindle 36 carrying an upper frame [2 for the seat 40, which frame is freely rotatable on said spindle and consists of a central portion 34 and outwardly bent brace portions 38.
Extending through a slot in one of the said brace portions 38 is an arm 64, which is preferably rigidly connected with the central portion 34 of the same brace, for instance by welding. This arm carries on its other end a gear rim 6'6. Parallel to said gear rim is a clutch disk 16 welded to a hub and provided on its periphery with teeth 12 engaging the teeth of the gear rim 66. A guide element for a post 18, such as a cover 14, is connected to the clutch disk 19, said cover being provided with apertures 16 for the post, which latter carries a chair back 80. The post 18 is provided with a longitudinally extending slot 82 engaged by an element 84 of rectangular cross section. Screwed into this element is a bolt 86 extending through the hub of the disk 19 and through a central aperture of restricted diameter in the center of the gear rim 66. On the outer side of the gear rim 66, a nut 88 is screwed onto the end portion of the bolt 86, said end portion having a restricted diameter, so that the gear rim 66 is pressed between the nut and a shoulder 89 of the bolt. The bifurcated end portion of a handle 90 embraces the element 84 and is supported thereon by means of a pin 92. This bifurcated end portion is formed as an eccentric, the eccentric surface 94 of which bears on a disk 96, which, in turn, bears on the post 18. In the position shown in Figs. 2 and 3, the gear rim 16 is locked by the disk 66, that is to say, by turning the handle 90 upwards it moves the disk 16 to the left as viewed in Fig. 2 through the medium of the disk 96 and the post I8 in such a manner that the teeth of the two geared elements 66 and I9 engage each other against the action of the spring 98 located therebetween. At the same time, the eccentric surface 94 thus forces the disk 96 against the post 18 so as to hold it fast. By turning the handle 90 through 90 in a clockwise direction according to Fig. 2, the locking engagement between the geared elements 66 and 10 is released by the action of spring 98, which moves rim 66 to the left (Fig. 2), so that the post 18 may be adjusted to another angular position. This angular movement may be limited by means of a projection 91 on the disk 10, said projection being brought into contact with the arm 64 when the chair back is lowered. By this shifting of the handle 99, the post 18 has also been released, so that the same may be moved in its longitudinal direction for the adjustment of the height of the chair back 86. By the fact that the handle 90, which is preferably directed upwardly for the purpose of facilitating an adjustment of the chair back in locked position, cooperates with the element 84 positively guided by the guide 82 of the post 18, the handle will always take a position parallel to the post.
While one preferred embodiment of the invention has been described, it is to be understood that the same is for purpose of illustration only, and that the invention is not to be limited thereby, but its scope is to be determined by the appended claims.
I claim:
1. In an adjustable chair, a seat supporting frame, an arm secured to and extending rearwardly from said frame, a first gear member rigidly secured to said arm, a longitudinally slotted back supporting post, a second gear member on one side of said post and an aper- 55 tured retaining member on the other side of said post rigidly fixed to said second gear member to provide a guide for said post, said post being longitudinally slidable and non-rotatable relative to said guide, a pressure plate located in the aperture in said retaining member, and means for locking said post against movement relative to said arm comprising a locking element fixed to said first gear member and extending through said second gear member, the slot in said post and said pressure plate, and a handle pivoted on said locking member, said handle having a cam located to bear on said pressure plate to draw said gear members into locking engagement and to grip said post between said second gear member and said pressure plate.
2. Apparatus as set forth in claim 1, in which said guide includes a stop located to engage said arm to limit the rotative movement of said arm.
3. Apparatus as set forth in claim 1, in which said locking member includes a block non-rogo tatable in said slot, said handle being pivoted to said block to turn in a plane extending longitudinally of said post.
CARL ERNST EDWARD LUNDQUIST.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 369,143 White Aug. 30, 1887 1,860,096 Headley May 24, 1932 1,927,491 Gabb Sept. 19, 1933 15 2,137,335 Gabb Nov. 22, 1938 FOREIGN PATENTS Number Country Date 132,968 Great Britain Mar. 18, 1919
US2512A 1943-05-12 1948-01-15 Adjustable chair back Expired - Lifetime US2590718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US2512A US2590718A (en) 1943-05-12 1948-01-15 Adjustable chair back

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE643183X 1943-05-12
US533370A US2476258A (en) 1942-10-03 1944-04-29 Support for vertically adjustable seats
CH260823T 1946-11-09
US2512A US2590718A (en) 1943-05-12 1948-01-15 Adjustable chair back

Publications (1)

Publication Number Publication Date
US2590718A true US2590718A (en) 1952-03-25

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Application Number Title Priority Date Filing Date
US2512A Expired - Lifetime US2590718A (en) 1943-05-12 1948-01-15 Adjustable chair back

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US (1) US2590718A (en)
CH (1) CH260823A (en)
FR (1) FR957096A (en)
GB (1) GB643183A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838264A (en) * 1954-07-19 1958-06-10 Matt V Hill Waste can holder
US3147946A (en) * 1961-10-13 1964-09-08 Vacudent Mfg Company Utility stool
US3351379A (en) * 1965-02-13 1967-11-07 Tan Sad Chair Co 1931 Ltd Chairs
US4712870A (en) * 1986-04-03 1987-12-15 Robinson Donald L Fresnell lens and filter for use with computers and the like
US20160157614A1 (en) * 2014-12-08 2016-06-09 Ferdinand Lusch Gmbh & Co. Kg Seating Furniture with Pivotable Functional Part
US9375118B2 (en) 2011-01-11 2016-06-28 Maurice Granger Device for dispensing pre-cut rolled or Z-folded wiping material
US9375117B2 (en) 2010-12-09 2016-06-28 Maurice Granger Device for dispensing pre-cut or Z-folded wiping material
US9526382B2 (en) 2012-09-17 2016-12-27 Maurice Granger Apparatus for dispensing precut materials wound into a coil or folded into a “Z”
US9872589B2 (en) 2011-03-03 2018-01-23 Maurice Granger Device for dispensing pre-cut rolled wiping material

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2927377C2 (en) * 1979-07-06 1983-12-08 Steifensand Sitzmöbel- und Tischfabrik Inh.: F. Martin Steifensand, 8501 Wendelstein Seating furniture, in particular office swivel chairs
GB2253138B (en) * 1991-02-08 1995-05-03 Evertaut Limited A chair
JPH08507935A (en) 1992-06-15 1996-08-27 ハーマン、ミラー、インコーポレイテッド Office chair
GB9218366D0 (en) * 1992-08-28 1992-10-14 Black & Decker Inc A locking device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB132968A (en) *
US369143A (en) * 1887-08-30 Compound swiveling and clamping joint mechanism
US1860096A (en) * 1928-02-20 1932-05-24 Tan Sad Chair Co 1931 Ltd Chair, seat and the like
US1927491A (en) * 1932-03-09 1933-09-19 Tan Sad Chair Co 1931 Ltd Backrest or support for alpha seat or the like
US2137335A (en) * 1936-08-21 1938-11-22 Tan Sad Chair Co 1931 Ltd Chair, seat, and the like

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB132968A (en) *
US369143A (en) * 1887-08-30 Compound swiveling and clamping joint mechanism
US1860096A (en) * 1928-02-20 1932-05-24 Tan Sad Chair Co 1931 Ltd Chair, seat and the like
US1927491A (en) * 1932-03-09 1933-09-19 Tan Sad Chair Co 1931 Ltd Backrest or support for alpha seat or the like
US2137335A (en) * 1936-08-21 1938-11-22 Tan Sad Chair Co 1931 Ltd Chair, seat, and the like

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838264A (en) * 1954-07-19 1958-06-10 Matt V Hill Waste can holder
US3147946A (en) * 1961-10-13 1964-09-08 Vacudent Mfg Company Utility stool
US3351379A (en) * 1965-02-13 1967-11-07 Tan Sad Chair Co 1931 Ltd Chairs
US4712870A (en) * 1986-04-03 1987-12-15 Robinson Donald L Fresnell lens and filter for use with computers and the like
US9375117B2 (en) 2010-12-09 2016-06-28 Maurice Granger Device for dispensing pre-cut or Z-folded wiping material
US9375118B2 (en) 2011-01-11 2016-06-28 Maurice Granger Device for dispensing pre-cut rolled or Z-folded wiping material
US9872589B2 (en) 2011-03-03 2018-01-23 Maurice Granger Device for dispensing pre-cut rolled wiping material
US9526382B2 (en) 2012-09-17 2016-12-27 Maurice Granger Apparatus for dispensing precut materials wound into a coil or folded into a “Z”
US20160157614A1 (en) * 2014-12-08 2016-06-09 Ferdinand Lusch Gmbh & Co. Kg Seating Furniture with Pivotable Functional Part
US9867467B2 (en) * 2014-12-08 2018-01-16 Ferdinand Lusch Gmbh & Co. Kg Seating furniture with pivotable functional part

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CH260823A (en) 1949-04-15
GB643183A (en) 1950-09-15
FR957096A (en) 1950-02-13

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