IL97762A - High density stacking flex chair - Google Patents

High density stacking flex chair

Info

Publication number
IL97762A
IL97762A IL9776291A IL9776291A IL97762A IL 97762 A IL97762 A IL 97762A IL 9776291 A IL9776291 A IL 9776291A IL 9776291 A IL9776291 A IL 9776291A IL 97762 A IL97762 A IL 97762A
Authority
IL
Israel
Prior art keywords
seat
chair
curved
frame
radius
Prior art date
Application number
IL9776291A
Other languages
Hebrew (he)
Other versions
IL97762A0 (en
Original Assignee
Perry Charles O
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 Perry Charles O filed Critical Perry Charles O
Publication of IL97762A0 publication Critical patent/IL97762A0/en
Publication of IL97762A publication Critical patent/IL97762A/en

Links

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
    • A47C1/031—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
    • 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
    • A47C3/021—Rocking chairs having elastic frames
    • A47C3/023—Rocking chairs having elastic frames made of tubular material
    • 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
    • A47C3/04—Stackable chairs; Nesting 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

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)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Stackable Containers (AREA)

Abstract

A high density stacking flex chair is disclosed. A frame has a seat attached thereto, and a back pivotally attached thereto. The back is curved and can tilt backwards, but is limited by the frame which, through the back, has a lesser radius of curvature and is angled downward, thus providing stop action for back rotation.

Description

ABSTRACT A high density stacking flex chair is disclosed A one-piece frame (10) has a seat portion (20) attached thereto, and a back portion (30) pivotally attached thereto. The back portion (30) is curved and can tilt backwards, but is limited by the frame (10) which, through the back portion (30) , has a lesser radius of curvature and is angled downward, thus providing stop action for back portion rotation HIGH DENSITY STACKING FLEX CHAIR This application is a continuation-in-part of co-pending application Serial No. 381,581, filed May 2, 1989 which was in turn a continuation-in-part of Serial No. 185,707, filed April 25, 1988, now abandoned.
BACKGROUND Field of the Invention The present invention relates to chair design, more specifically, to a design for a high density stacking chair with a tilting back.
Discussion of the Prior Art The use of low-cost, stacking chairs is well-known in the art. However, such chairs are designed not with comfort or ergonomics in mind, but rather to provide a large quantity of temporary seats for occasional use which can ordinarily be stored and take up minimal storage space. Such chairs may have some limited flexibility in the seat back portion, but provide no ergonomic benefits.
Considerable attention has been focused in recent years on better ergonomic designs, resulting in home and office chairs which demonstrate a wide variety of designs which include the ability to recline and provide lumbar support. See, for example, U.S. Patent No. 4,732,424. Such ergonomic designs do not, however, provide low cost seating. Thus, it would be desirable to combine the benefits of ergonomic design into a low cost, stackable chair.
SUMMARY OF THE INVENTION A high density stacking chair with a tiltable back portion is presented, wherein a single continuous frame is provided, having a seat portion attached thereto, and a back portion pivotally attached thereto. Ergometric adjustment of the chair is accomplished by tilting of the back portion and flexure of the frame, and flexure of the frame urges the back portion into a normal upright position for stacking and uniform appearance. The back portion is curved and hollow, and engages the frame at upper and lower curved sections of the frame, which sections have radii of curvatures less than that of the back portion and which sections are positioned at a downward angle such that the effective horizontal radii of the sections in the upright position is shorter than the actual radii, causing the back portion to rest against the curved sections and limit forward tilting of the chair back. When the back portion is tilted, the radial movement disengages the back portion from the curved sections due to the difference in radii, until the angle of tilt is such that the effective radii are again equal and the back portion again rests against the curved sections of the frame and limits tilting backward.
A better understanding of the features and advantages of the present invention will be obtained by reference to the following detailed description of the invention and accompanying drawings which set forth an illustrative embodiment in which the principles of the invention are utilized.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a chair built according to the present invention.
Fig. 2 is the preferred embodiment of a chair built according to the present embodiment.
Figs. 3-5 are views taken across section 3-3 of Fig. 1 and showing the chair extending through its range of backward tilt.
Fig. 6 is a view taken across Section 6-6 Fig. 4 and represents a plan view of the chair according to the present invention.
Fig. 7 is a perspective view of the chair according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION Referring now to Fig. 1, a first embodiment of a chair according to the present invention is shown. There are three major portions of the chair: a frame 10, a seat portion 20, and a back portion 30. The back portion is curved to adapt to a user's back and is composed of a front section 32 and a rear section 34, each of which has a lip 33, 35 or other spacer which creates a hollow interior space between sections when they are attached.
The frame 10 is ideally a continuous structure, constructed of solid rod or tubular steel or the like. Alternatively, it may consist of welded or otherwise connected sections. The frame 10 has an upper curved section 12 which is enclosed within the back portion 30 with cylindrical bearing sections 12a at either end and which extends through the middle of the back portion and is angled downward. The frame 10 then extends from each end of the upper curved section 12 outward from the hollow interior, the back portion 30 being pivotally attached thereto at the cylindrical sections 12a. This pivotal attachment can be accomplished by bearings attached to the front section 32, but is preferably accomplished by providing bearing surfaces 12b formed on plastic molded front and back sections 32 and 34.
The frame 10 has a pair of rear support legs 16 which extend downward and rearward to a floor surface and forwardly along the floor. A pair of front support legs 18 then extend upward and rearward to the front of the seat portion 20, then rearward supporting the seat portion 20, then slightly inward, then upward into the back portion 30, then inward, where the back portion is again pivotally attached in a manner similar to the pivot connection 12a and 12b. The frame 10 continues to a lower curved section 14 which is enclosed within the back portion and which extends through the back portion having a downward angle. The distance dx between the opposing legs of the frame 10 as it sits on the floor is lesser than the width d2 of the seat portion 20, so as to facilitate stacking a plurality of such chairs.
In the preferred embodiment of Fig. 2, the seat supporting portion of the frame 10 is positioned inwardly from the edges of the seat portion 20 and connected by welded struts 22 to improve the support of the seat portion and lateral stability of the frame. In Fig. 7, such lateral stability can be provided by a pair of stabilizers 50, 52.
Additionally, clips 24 are attached to the bottom surface of the seat portion 20 in order to easily attach/detach the seat portion to frame 10.
The back portion 30 is a one-piece molded unit, having openings or clips 40 which are adapted to pivotally engage the rear support legs 16 at cylindrical sections 12a. Openings or clips 42 are likewise adapted to pivotally engage the front support legs 18. In this way, the back portion 30 may be easily and securely fitted to frame 10. The curved sections 12 and 14 remain in a fixed position relative to frame 10 to provide pivotal limits, as will be next described.
Referring now to Figs. 3-5, the tilting action of the back portion 30 is illustrated. When the chair is in its upright position, as in Fig. 3, the rear support legs 16 of the frame 10 are inclined at a forward angle so as to provide a natural spring- type action which holds the back portion 30 forward.
The curved sections 12 and 14 of frame 10 are parallel, each extending outward and downward from the back of the front section 32 at a twenty-two and one-half degree angle. The radii of curvature for both curved sections 12 and 14 is lesser than that of the back portion. But, the radius of curvature of section 12 projected at a plane inclined to the plane of section 12 by an angle of 22.5 degrees equals the radius of curvature of the back portion 30, such that the inside of the front section 32 is in contact with the curved sections 12 and 14 at points 36 and 37 as a result of the effective radius of the curved sections 12 and 14 being equal to the radius of the back portion 30.
As a user leans back on the chair, the front section 32 pivots about point 50 on the upper curved section, causing the upper half of the front section to rotate backwards, and the lower half to rotate forward about point 50. Note also that the seat portion 20 will be lifted by the forward rotation of the lower curved section 14. Since the back portion 30 has a greater radius of curvature than both curved sections, the back portion lifts away from the curved sections as it is tilted, reengaging the curved sections at points 38 and 39, located further down the back portion, where the effective radii of the back portion is again equal to the radii of the curved sections after the back portion has tilted 45 degrees.
A clearer view of the relationship of the curved sections 12 and 14 to the overall frame structure 10 is illustrated in Fig. 6 where the cylindrical sections of the frame 12a are apparent providing straight bearing areas.
It should be understood that the invention is not intended to be limited by the specifics of the above-described embodiment, but rather defined by the accompanying claims.

Claims (6)

1. A chair, comprising-. a. a seat adapted to engage a user's seat; b. a back generally perpendicular to said seat and adapted to engage a user's back and having a top and a bottom and upper and lower regions between the top and bottom; and c. a flexible frame for holding and supporting said seat and back, said frame comprising: i. a pair of support legs one at each side of the seat with each support leg having, (1) a resilient back leg portion pivotally attached to the upper region of said back below the top, (2) a bottom leg portion for extending along a floor surface, and (3) a fi'ont leg portion extending upwardly to the front of said seat to support said seat, and ii . a pivotal connection connecting the rear of the seat to the lower region of the back at a location substantially above the seat, wherein the flexibility of the frame and the pivotal connections permit the back to tilt toward a reclining position while the back functions as a lever against the resiliency of the back leg portion forcing the bottom of the back forwardly for lumbar support .
2. The chair of claim 1 in which the pivotal connections at the upper" and lower regions of the back comprise curved struts extending across the back limiting tilting of the back both toward and away from the reclining position. - 8 - 97762/3
3. Λ high density stacking flex chair as in claim 2, wherein said back lias a curved surface, and said stop means comprises a curved rod connected between the support legs for pivotal movement with respect to the back as the back pivots with respect to the legs with the rod having a radius of curvature less than the radius of curvature of the back and engaging the back along an elongated common curve, whereby the rod limits pivotal movement of the back in one direction and permits limited pivotal movement of the back in the opposite direction.
4. Λ high density stacking flex chair as in claim 2, wherein said stop means comprises a. a first curvilinear section attached to each of said support legs at the upper region of said back and extending across the upper region at a downward angle, wherein said first curvilinear section has a radius of curvature less than that of said back, and wherein said back is pivotally attached to said support legs and first curvilinear section, and b. a second curvilinear section attached to said connecting means at the lower region of said back and extending across the lower region at said downward angle, wherein said second curvilinear section has a radius of _9_ 97762/2 curvature less than that of said back, and said downward angle is equal to about twenty-two degrees. as cl aimed in cl aim 1
5. Λ seat back for a chair/adapted to engage a user's back and tilt with respect to a support when a user. leans back in said chair, comprising: c. a curved seat back; ■ d. a curved rod forming part of said support and having a radius of curvature less than that of said seat back; e. mounting means for pivotally attaching the seat back to said curved rod, with interference between the curved seat back and the curved rod along matching curves providing the pivotal limits in both directions for tilting of the seat back.
6. Λ seat back as in claim 5, wherein the tilting of said seat back causes the interior of the seat back to move away from said curved rod in a radial fashion, reengaging said curved rod at an angle determined by the relative radii of curvatures between said seat back and said curved rod. COHHf ZEEfik / ATTORNEYS FOR
IL9776291A 1990-04-10 1991-04-03 High density stacking flex chair IL97762A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US50671690A 1990-04-10 1990-04-10

Publications (2)

Publication Number Publication Date
IL97762A0 IL97762A0 (en) 1992-06-21
IL97762A true IL97762A (en) 1994-08-26

Family

ID=24015733

Family Applications (1)

Application Number Title Priority Date Filing Date
IL9776291A IL97762A (en) 1990-04-10 1991-04-03 High density stacking flex chair

Country Status (12)

Country Link
US (1) USRE36335E (en)
EP (1) EP0539377B1 (en)
JP (2) JPH0815446B2 (en)
KR (1) KR0182297B1 (en)
AT (1) ATE167369T1 (en)
AU (1) AU651971B2 (en)
CA (1) CA2080248C (en)
DE (1) DE69129628T2 (en)
ES (1) ES2118081T3 (en)
IL (1) IL97762A (en)
NZ (1) NZ237726A (en)
WO (1) WO1991015139A1 (en)

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Also Published As

Publication number Publication date
KR0182297B1 (en) 1999-05-01
CA2080248A1 (en) 1991-10-11
USRE36335E (en) 1999-10-12
AU7691691A (en) 1991-10-30
EP0539377B1 (en) 1998-06-17
JP3065274B2 (en) 2000-07-17
NZ237726A (en) 1994-08-26
DE69129628T2 (en) 1998-10-15
EP0539377A4 (en) 1993-06-16
IL97762A0 (en) 1992-06-21
JPH0815446B2 (en) 1996-02-21
CA2080248C (en) 1996-10-29
ATE167369T1 (en) 1998-07-15
JPH05507632A (en) 1993-11-04
ES2118081T3 (en) 1998-09-16
EP0539377A1 (en) 1993-05-05
WO1991015139A1 (en) 1991-10-17
DE69129628D1 (en) 1998-07-23
AU651971B2 (en) 1994-08-11
JPH1033294A (en) 1998-02-10

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