EP0904713A2 - Schwenkbarer Stützrahmen für einen Sitz oder Rückenlehne - Google Patents

Schwenkbarer Stützrahmen für einen Sitz oder Rückenlehne Download PDF

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Publication number
EP0904713A2
EP0904713A2 EP98105311A EP98105311A EP0904713A2 EP 0904713 A2 EP0904713 A2 EP 0904713A2 EP 98105311 A EP98105311 A EP 98105311A EP 98105311 A EP98105311 A EP 98105311A EP 0904713 A2 EP0904713 A2 EP 0904713A2
Authority
EP
European Patent Office
Prior art keywords
arm
telescopic rod
plate
walls
section
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.)
Withdrawn
Application number
EP98105311A
Other languages
English (en)
French (fr)
Other versions
EP0904713A3 (de
Inventor
Luigi Zen
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.)
AAA NE Italy made Srl
Original Assignee
AAA NE Italy made Srl
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 AAA NE Italy made Srl filed Critical AAA NE Italy made Srl
Publication of EP0904713A2 publication Critical patent/EP0904713A2/de
Publication of EP0904713A3 publication Critical patent/EP0904713A3/de
Withdrawn legal-status Critical Current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
    • 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
    • A47C7/44—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
    • A47C7/444—Supports for the head or the back for the back with elastically-mounted frame with coil springs of torsion type

Definitions

  • the present invention provides a supporting frame for a chair seat and back, comprising a substantially horizontal arm to which the chair seat is fastened and a substantially vertical rod on which the chair back is fitted, said rod being hinged to said arm and being subject to the action of elastic means which push it forward to keep the chair back in contact with the user.
  • Hinged supporting frames for a chair seat and back are known generally comprising a substantially horizontal arm, to which the chair seat is fastened, and a telescopic rod being hinged to said arm at the back of the frame and subject to the action of a spring which tends to push the chair back against the user.
  • This telescopic rod usually consists of a pair of sections, for example C-shaped sections, each sliding inside the other to allow the height of the chair back to be adjusted, and devices are provided which lock the telescopic rod in the desired position.
  • a pair of side walls are provided at the base of the telescopic rod which fit around the horizontal arm and wherein holes are provided for a pin passing therethrough, said pin forming the hinge around which the telescopic rod rotates, and for clamping screw means.
  • a pin parallel to the hinge pin is provided in front of said hinge pin.
  • a spiral spring is inserted, an end of which engages the front pin in the horizontal arm and the other end engages the lower edge of the telescopic rod, thus exerting a force which tends to rotate the telescopic rod forward.
  • a plurality of friction sheets are inserted which are tightened between a spacer, inserted on said screw, and the arm wall.
  • the friction sheets are alternatively integral with the horizontal arm and the telescopic rod to increase the friction area.
  • Another problem of prior art frames is the difficulty in preventing the rotation of the screw forming the steady pin when the knob for fastening the telescopic rod is tightened.
  • an eyelet with substantially parallel sides is provided, inside which the polygonal end of the screw shank is inserted.
  • a gauged hole housing the screw head is provided in the wall of the telescopic rod.
  • the present invention provides a swinging supporting frame for a chair seat and back, wherein the elastic force pushing forward the telescopic rod which supports the chair back is supplied by a spring which is fit on a pin in the horizontal arm and an end of which acts directly against said arm, whereas the other end acts against the clamping screw means.
  • the frame of the invention comprises a suybstantially horizontal arm, shown as a whole by numeral 1, to be fastened by means of a plate or the like to a chair seat, and a telescopic rod, shown as a whole by numeral 2, which is hinged to the arm 1 and at the upper end of which a plate 3 is hinged to which the chair back is fastened.
  • the arm 1 is obtained by blanking and shaping a plate, for example a conveniently thick steel plate, to provide a central stiffening rib 4 (see figures 2 and 3) and a pair of side walls 5.
  • the side walls 5 have a hole for the insertion of a hinge pin 6 on which also one or more springs 40 (shown in fig. 11) are fitted up, acting on the telescopic rod 2.
  • An eyelet 7 is also provided in the side walls 5, to let a screw pass therethrough to lock the telescopic rod in the desired position.
  • the eyelet 7 has an elongated shape to allow the screw to shift and follow the swinging of the telescopic rod 2.
  • the side walls of the arm 1 have two pairs of teeth, shown by numerals 8 and 9 respectively, which are obtained directly in the plate wall by blanking and drawing. These teeth 8 and 9 act as a guide to position friction plates 10, which are shaped as shown in figure 9, with an eyelet which corrsponds to eyelet 7 in walls 5 of arm 1.
  • Two washers are insertd on the clamping screw and operate in contact with said friction plates 10 and with the walls 5, to develop a friction that slows the movements of the rod 2.
  • the central rib 4 has a thickened portion 11 which is drilled and threaded to allow a screw to be tightened for fastening the chair seat and which has a hexagonal cavity for a nut or the like.
  • the telescopic rod (fig. 1) comprises a base 12 and a bar 13 supporting the chair back, said bar 13 sliding inside the base 12.
  • the base is substantially a C-shaped section having at its lower end a pair of side walls 14 which fit around the walls 5 at the back of the horizontal arm 1.
  • a hole is provided, in a location corresponding to the hole 6 in the arm 1, to let the hinge pin pass therethrough.
  • the seat for the screw fastening the telescopic rod shown by numeral 16 in figure 10, is blanked in the walls 14.
  • a pair of washers 17 and 18 are blanked, the former of which has a polygonal opening 19 and the latter has a circular port 20 (see figs. 6, 7).
  • the washers 17 and 18 are not blanked along the whole circumference, but banking is interrupted for a short length in order to form an extension 21 connecting the washers to the wall 14.
  • the width of the extension 21 is limited, the force by which the screw is tightened, exerted along a short length, causes a slight local deformation of the wall 14, in particular of the extension 21, thus enabling the washers 17 and 18 to move forward with respect to the wall 14 to lean against the wall 5 of the horizontal arm, as shown in detail in figure 5.
  • the side walls 5 of arm 1 may have two upwardly bent wings 45, each having a slot 46 (fig. 3a).
  • a washer inserted on the screw 16, may then be positioned between wall 5 and wing 45, to exert a frictinal force which opposes to the movements of rod 2.
  • the section 13 has, at its lower end, a central slot 22, which starts at the base and extends to a certain height.
  • the facing edges of the section 13 have a series of teeth 42 which engage one another, in order to prevent the two edges from sliding during work and provide greater structural stiffness.
  • a tongue 23 with a larger upper end 24 is blanked in the base section 12.
  • a threaded hole 25 is provided, whereas the tongue 23 is bent to form one or more loops shown by numeral 26 in figures 6 and 7.
  • the shank of a knob for locking the section 13 at the desired height is screwed into the threaded hole 25 to adjust the height of the chair back.
  • the section 13 is inserted into the base 12 by fitting the slot 22 on the threaded shank of the knob (not shown), which is screwed into the head 24.
  • the loops 26 help to move the head 24 downwards with respect to its initial position, in order to avoid that, by using a small knob, said knob can pass through the hole with which the head 24 was connected.
  • the slot 22 may be provided in the base 12. In such a case, only a threaded hole for the knob will be provided in the section 13, and the knob will shift together with the section when adjusting the height of the seat back.
  • the lower end of the section 13 has two little projections or teeth 43 (fig. 12) which, though resiliently buckling and allowing the section to be fitted onto the screw of the locking knob, prevent the section 13 from being inadvertently drawn out of the base 12.
  • the upper end of the section 13 may be preferably folded to provide a sort of bar or arm on which the plate for fastening the chair back may be set, without any need to fit a small bar by welding, as it occurs with the prior art.
  • the telescopic rod 2 is fitted onto the arm 1, then the sheets 10 are inserted between the teeth 8 and 9, after which the spacer is positioned inside the arm 5, and the screw 16 is inserted with the washers thereon, said screw 16 passing through the holes 19, 7 and 20 and the spacer 30, with the shank polygonal portion entering the port 19 of the washer 18.
  • One of the spring ends leans against the arm 1 and the other spring end leans against the spacer 30 inserted on the screw 16.
  • This easy assembly allows the whole apparatus to be automatically assembled.
  • the telescopic rod 2 can be locked in position, whereas, by tightening the knob with less force the friction effect of the plates 10 can be exploited to slow down the movements caused by the spring.
  • the plate 3 has a central body 28 and a pair of flanges 29 which are connected to the body 28 by means of a pair of sloping walls 30 (figure 16).
  • the side walls 30 have a pair of holes 31 into which the arm 27 of the section 13 is inserted to provide a hinge support for the plate.
  • a pair of tabs 32 are also provided by blanking and folding the plate, which fit around the section 13 when the plate is set up in order to keep it centred on the telescopic rod and the arm 27.
  • the length of the arm is slightly greater than the distance between the holes 31 to allow the plate to be set up firmly when it is centred on its support and also to allow the arms to be slid from the plate by disengaging them from the holes 31 when the plate is pushed on one side or the other against the section 13.
  • This configuration allows the plate to be easily assembled with the chair back, without any need to use screws or the like.
  • the tabs 32 engage the section 13 to prevent the plate from sliding in one direction or the other, thus enabling said plate to swing with the chair back, but not to slide from its support.
  • a small plate 33 made of a plastic material, preferably a tender and compressible plastic material which is divided into two overlapping areas of different thickness, is applied onto the plate 3.
  • the thickness of the small plate 33, which leans against the section 13 of the telescopic rod 2, defines the inclination of the chair back.
  • the holes 31 in the small plate are arranged at half height and the small plate is symmetric to both axes, it is possible to slide and set the small plate up again after having turned it upside-down, so as to lean against the section 13 the more or less thick portion of the small plate 33 and change the inclination of the chair back.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Percussion Or Vibration Massage (AREA)
EP98105311A 1997-09-22 1998-03-24 Schwenkbarer Stützrahmen für einen Sitz oder Rückenlehne Withdrawn EP0904713A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPC970026 1997-09-22
IT97PC000026A IT1296230B1 (it) 1997-09-22 1997-09-22 Supporto oscillante per lo schienale di un sedile

Publications (2)

Publication Number Publication Date
EP0904713A2 true EP0904713A2 (de) 1999-03-31
EP0904713A3 EP0904713A3 (de) 2000-05-03

Family

ID=11389263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98105311A Withdrawn EP0904713A3 (de) 1997-09-22 1998-03-24 Schwenkbarer Stützrahmen für einen Sitz oder Rückenlehne

Country Status (3)

Country Link
EP (1) EP0904713A3 (de)
CA (1) CA2230107A1 (de)
IT (1) IT1296230B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004075691A3 (en) * 2003-02-25 2004-10-21 Erreti Snc Di Rinaldo Tonin & Cushioning device to cushion the backrest of a chair, an armchair, an office chair or similar

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062587A (en) * 1976-01-13 1977-12-13 Herman Miller, Inc. Back position control device for chairs
US5066069A (en) * 1990-05-03 1991-11-19 Systems Furniture Company Chair back and seat adjustment mechanism
US5356200A (en) * 1992-10-23 1994-10-18 Doerner Products Ltd. Unitary brake for a chair tilt mechanism
AU668431B2 (en) * 1992-12-01 1996-05-02 Klasse Pty Ltd Adjustment mechanism for a chair

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004075691A3 (en) * 2003-02-25 2004-10-21 Erreti Snc Di Rinaldo Tonin & Cushioning device to cushion the backrest of a chair, an armchair, an office chair or similar
US7249801B2 (en) 2003-02-25 2007-07-31 Erreti Snc Di Rinaldo Tonin & C. Cushioning device to cushion the backrest of a chair, an armchair, an office chair or similar

Also Published As

Publication number Publication date
IT1296230B1 (it) 1999-06-18
CA2230107A1 (en) 1999-03-22
ITPC970026A0 (it) 1997-09-22
EP0904713A3 (de) 2000-05-03
ITPC970026A1 (it) 1999-03-22

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