US3464663A - Tilting chair - Google Patents

Tilting chair Download PDF

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Publication number
US3464663A
US3464663A US687180A US3464663DA US3464663A US 3464663 A US3464663 A US 3464663A US 687180 A US687180 A US 687180A US 3464663D A US3464663D A US 3464663DA US 3464663 A US3464663 A US 3464663A
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US
United States
Prior art keywords
tube
chair
arm
secured
bracket
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
US687180A
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English (en)
Inventor
Karl Georg Blomborg
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.)
BLOMBORGS MEKANISKA AB
Original Assignee
BLOMBORGS MEKANISKA AB
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 BLOMBORGS MEKANISKA AB filed Critical BLOMBORGS MEKANISKA AB
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Publication of US3464663A publication Critical patent/US3464663A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
    • 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
    • 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
    • A47C7/4454—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 of torsion type

Definitions

  • a tilting chair supported by a post has two brackets secured to the underside of the chair seat and a tube which is rotatably connected to one of the brackets and houses an axially extending torsion spring rigidly connected to the one bracket. The other end of the spring is connected with a sleeve rotatably mounted in the other bracket. Members are provided for adjusting the relative angular position of the sleeve and the tube.
  • This invention relates to a chair the seat of which is supported by a post having a foot and in which the chair seat is tiltable relative to the post against the action of a torsion spring which is provided between two brackets secured to the under side of the seat.
  • the object of the invention is to provide a simple and strong chair construction, such as of the armchair type, wherein the seat is resiliently tiltable and adjustable in dilferent positions of inclination. Another object is to provide a tilting chair construction in which the tilting device is prevented from jamming or squeaking.
  • FIG. 1 is a top plan view of the chair construction with the chair seat removed
  • FIG. 2 is a partly sectional lateral elevation of the construction.
  • Brackets 2 and 4 are adapted to be secured to the underside of a chair seat, not shown, by means of screws, not shown, extending through holes 6 in the brackets.
  • a hollow metallic block 8 is rigidly secured to the bracket 2 substantially midway between the ends thereof.
  • one end of a tube 10 extends into the block and is welded thereto.
  • a torsion spring or bar 14 of substantially square cross section is fixedly inserted in a sleeve 16 which is rigidly connected with the tube 10 and has a square hole corresponding to the cross section of the torsion bar 14.
  • a needle bearing 18 provided adjacent the block 8 an external tube 20 is mounted for turning movement on the tube 10.
  • the tubes 20 and 10 extend in coaxial relation to the proximity of the other bracket 4 where they are guided relative each other by a plastic bushing 22 in the manner shown in FIG. 2.
  • the other end of the torsion bar 14 is firmly inserted in a square hole 26 in a thick-walled portion of a sleeve 24.
  • a ball bearing 28 By means of a ball bearing 28 the end of the sleeve 24 near the bracket 4 is mounted for turning movement on a stud 30 rigidly secured to the bracket 4.
  • the end of the tube 20 near the bracket 4 fits snugly in a thin-walled portion of the sleeve 24.
  • the end of the sleeve 24 removed from the bracket 4 is integrally formed with a projection 32 through which a screw 34 extends laterally of the tube 20.
  • Another projection 36 is secured to the tube 20, such as by welding.
  • the major part of the projection 36 is concealed and indicated in 3,464,663 Patented Sept. 2, 1969 "ice dotted lines.
  • the end of the screw 34 is in contact with the adjacent side of the projection 36.
  • a lateral projection 38 is secured to the end of the tube 20 near the bracket 2.
  • the free end of the projection 38 is received in a cavity in a member 40 secured to the block 8, and the projection has a limited amount of movement in this cavity. Consequently, the tube 20 has a limited amount of turning movement relative to the block 8 and bracket 2.
  • a projection 42 is secured, such as by welding, to the end of the tube 20 near the bracket 2.
  • a toothed segment 44 Secured to the outer end of the pro jection 42 is a toothed segment 44 the teeth 46 of which are parallel to the axis of the tube 20 and extend laterally of the block 8 as shown in FIG. 1.
  • the extension of the toothed segment 44 at right angles to the plane of the drawing corresponds substantially to the thickness of the block 8 as viewed in FIG. 2.
  • one end 50' of an arm 50 is pivotally mounted in the block 8.
  • the other end of the arm 50 extends outside the bracket 2 in the form of a handle.
  • the end 50' of the arm In the position of the arm 50 shown in full lines in FIG. 1 the end 50' of the arm is received in the space between two of the teeth 46.
  • the end 50" of the arm In the position of the arm 50 shown in chain-dotted lines the end 50" of the arm is out of engagement with the teeth 46.
  • the arm On the side of the arm 50 removed from the toothed segment 44 as viewed in FIG. 1 the arm has two cam recesses 52 and 54 for cooperation with a locking ball 58 which is forced against the arm by a compression spring 56 shown in dotted lines.
  • the ball 58 engages the cam recess 52 when the arm 50 is in the position shown in full lines, whereas in the position of the arm 50 shown in chain-dotted lines the ball 58 will be received in the cam recess 54.
  • the tube 20 is secured to an attachment 60 by means of which the tube 20 is connected to a post 62 which in turn is connected to a foot, not shown.
  • the post 62 is rotatably and displaceably connected to said foot.
  • the mode of operation is as follows.
  • the tension of the torsion bar 14 and consequently the resistance to the movement caused by a chair occupant who tilts the seat 'of the chair is adjusted in accordance with the weight of the chair occupant by means of the screw 34 which can be turned such as by a separate wrench or by a lever, not shown, connected to the head of the screw.
  • the screw 34 which can be turned such as by a separate wrench or by a lever, not shown, connected to the head of the screw.
  • the arm 50 is out of engagement with the teeth 46.
  • the chair occupant In order to adjust a certain position of inclination of the seat, the chair occupant inclines to this position, resulting in that the toothed segment 44, 46 connected to the tube 20 will be moved relative to the block 8 associated with the arm 50.
  • the arm 50 is turned into the position shown in full lines in FIG.
  • the main function of the tube 10 is to constitute a part on which the tube 20 is mounted. Therefore the tube 10 could end at the place where the needle bearing 18 is located. However, due to the fact that the tube 10 extends as far as the tube 20 and is connected thereto in the manner illustrated it serves as a guide means and results in a more stable construtcion. It will be obvious that the scope of the invention i not limited by the means illustrated for mounting the tube 20 near the block 8.
  • a chair construction comprising a post having a foot, a seat supported by and tiltable relative to said post, two brackets secured to the underside of the seat, a tube extending between said brackets and secured to the post and having one of its ends connected for turning movement with one of said brackets, and a torsion spring exteding axially through the tube and having one of its ends rigidly secured to said one bracket for counteracting tilting movement of the chair seat, wherein the improvement comprises a sleeve secured to the other end of the torsion spring and mounted for turning movement in the other one of said brackets, said sleeve surrounding the other end of the tube concentrically with a snug fit, and means for adjusting the relative angular position of the sleeve and the tube.
  • a chair construction as claimed in claim 1 wherein said means comprises an axially extending projection of the sleeve, a lateral projection of the tube, and a screw screwed through the first named projection and abutting said lateral projection.

Landscapes

  • Mutual Connection Of Rods And Tubes (AREA)
  • Chairs Characterized By Structure (AREA)
US687180A 1967-02-03 1967-12-01 Tilting chair Expired - Lifetime US3464663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1577/67A SE319875B (fi) 1967-02-03 1967-02-03

Publications (1)

Publication Number Publication Date
US3464663A true US3464663A (en) 1969-09-02

Family

ID=20258439

Family Applications (1)

Application Number Title Priority Date Filing Date
US687180A Expired - Lifetime US3464663A (en) 1967-02-03 1967-12-01 Tilting chair

Country Status (4)

Country Link
US (1) US3464663A (fi)
DE (1) DE1983166U (fi)
FI (1) FI44460C (fi)
SE (1) SE319875B (fi)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592433A (en) * 1969-02-25 1971-07-13 Bliss & Laughlin Ind Torsion bar chair control
US3598354A (en) * 1969-08-27 1971-08-10 Stewart Warner Corp Chair control structure
US3788586A (en) * 1969-12-12 1974-01-29 Steelcase Inc Torsion rod chair iron
US4328943A (en) * 1979-06-11 1982-05-11 Knoll International, Inc. Control mechanism for a chair or the like
US4431157A (en) * 1981-11-18 1984-02-14 Tor Arild Pivotal adjustment mechanism
US6065803A (en) * 1999-05-05 2000-05-23 L&P Property Management Company Seat back tilt control apparatus

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US163145A (en) * 1875-05-11 Improvement in rocking-chairs
US304876A (en) * 1884-09-09 Dental chair
US2130767A (en) * 1937-01-16 1938-09-20 American Car & Foundry Co Reclining seat control mechanism
US2760553A (en) * 1954-06-07 1956-08-28 Lie Finn Tilting chair
US2845991A (en) * 1955-04-28 1958-08-05 Manton Ahlberg H Chair control or iron
US2935119A (en) * 1957-04-01 1960-05-03 Lie Finn Tilting chair restraining mechanism
US3072377A (en) * 1959-07-24 1963-01-08 Blomborg Karl Georg Easy chair
US3131904A (en) * 1961-07-25 1964-05-05 Lie Finn Tilting chair construction
US3162420A (en) * 1961-08-17 1964-12-22 Lie Finn Torsion bar chair iron
US3185429A (en) * 1963-05-15 1965-05-25 Seng Co Tilting chair mechanism

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US163145A (en) * 1875-05-11 Improvement in rocking-chairs
US304876A (en) * 1884-09-09 Dental chair
US2130767A (en) * 1937-01-16 1938-09-20 American Car & Foundry Co Reclining seat control mechanism
US2760553A (en) * 1954-06-07 1956-08-28 Lie Finn Tilting chair
US2845991A (en) * 1955-04-28 1958-08-05 Manton Ahlberg H Chair control or iron
US2935119A (en) * 1957-04-01 1960-05-03 Lie Finn Tilting chair restraining mechanism
US3072377A (en) * 1959-07-24 1963-01-08 Blomborg Karl Georg Easy chair
US3131904A (en) * 1961-07-25 1964-05-05 Lie Finn Tilting chair construction
US3162420A (en) * 1961-08-17 1964-12-22 Lie Finn Torsion bar chair iron
US3185429A (en) * 1963-05-15 1965-05-25 Seng Co Tilting chair mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592433A (en) * 1969-02-25 1971-07-13 Bliss & Laughlin Ind Torsion bar chair control
US3598354A (en) * 1969-08-27 1971-08-10 Stewart Warner Corp Chair control structure
US3788586A (en) * 1969-12-12 1974-01-29 Steelcase Inc Torsion rod chair iron
US4328943A (en) * 1979-06-11 1982-05-11 Knoll International, Inc. Control mechanism for a chair or the like
US4431157A (en) * 1981-11-18 1984-02-14 Tor Arild Pivotal adjustment mechanism
US6065803A (en) * 1999-05-05 2000-05-23 L&P Property Management Company Seat back tilt control apparatus
WO2000065960A1 (en) * 1999-05-05 2000-11-09 L & P Property Management Company Seat back tilt control apparatus

Also Published As

Publication number Publication date
DE1983166U (de) 1968-04-11
SE319875B (fi) 1970-01-26
FI44460B (fi) 1971-08-02
FI44460C (fi) 1971-11-10

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