CA2080248C - High density stacking flex chair - Google Patents
High density stacking flex chairInfo
- Publication number
- CA2080248C CA2080248C CA002080248A CA2080248A CA2080248C CA 2080248 C CA2080248 C CA 2080248C CA 002080248 A CA002080248 A CA 002080248A CA 2080248 A CA2080248 A CA 2080248A CA 2080248 C CA2080248 C CA 2080248C
- Authority
- CA
- Canada
- Prior art keywords
- seat
- user
- chair
- frame
- engage
- 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
Links
- 210000001364 upper extremity Anatomy 0.000 claims description 2
- ODPOAESBSUKMHD-UHFFFAOYSA-L 6,7-dihydrodipyrido[1,2-b:1',2'-e]pyrazine-5,8-diium;dibromide Chemical compound [Br-].[Br-].C1=CC=[N+]2CC[N+]3=CC=CC=C3C2=C1 ODPOAESBSUKMHD-UHFFFAOYSA-L 0.000 description 3
- 239000005630 Diquat Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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—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 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)
- Stackable Containers (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
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.
Description
The present invention relates to chalr design, more speclflcally, to a deslgn for a hlgh denslty stacklng chalr wlth a tiltlng back.
Dlscusslon of the Prlor Art The use of low-cost, stacklng chalrs is well-known ln the art. However, such chalrs are deslgned not wlth comfort or ergonomlcs in mlnd, but rather to provlde a large quantity of temporary seats for occasional use whlch can ordinarlly be stored and take up mlnimal storage space. Such chairs may have some llmlted flexibility in the seat back portion, but provide no ergonomlc beneflts.
Conslderable attentlon has been focused in recent years on better ergonomlc deslgns, resultlng ln home and offlce chalrs whlch demonstrate a wlde varlety of deslgns whlch lnclude the ablllty to recllne and provlde lumbar support. See, for example, U.S. Patent No. 4,732,424. Such ergonomlc deslgns do not, however, provlde low cost seatlng.
Thus, it would be desirable to comblne the beneflts of ergonomic deslgn lnto a low cost, stackable chalr.
SUMMARY OF THE INVENTION
The lnvention provldes a chalr, comprlslng: a. a seat portlon havlng a shape adapted to engage a user's seat;
b. a back portlon generally perpendlcular to sald seat portlon and adapted to engage a user's back and havlng upper, lntermedlate and lower regions; c. a frame for holdlng and supportlng sald seat and back portlons, sald frame comprlslng:
i. a palr of rear support legs each plvotally connected to the lntermedlate reglon of sald back portlon and extendlng downward to a floor surface wlth sald rear support legs spaced - 1- ~r-B
Dlscusslon of the Prlor Art The use of low-cost, stacklng chalrs is well-known ln the art. However, such chalrs are deslgned not wlth comfort or ergonomlcs in mlnd, but rather to provlde a large quantity of temporary seats for occasional use whlch can ordinarlly be stored and take up mlnimal storage space. Such chairs may have some llmlted flexibility in the seat back portion, but provide no ergonomlc beneflts.
Conslderable attentlon has been focused in recent years on better ergonomlc deslgns, resultlng ln home and offlce chalrs whlch demonstrate a wlde varlety of deslgns whlch lnclude the ablllty to recllne and provlde lumbar support. See, for example, U.S. Patent No. 4,732,424. Such ergonomlc deslgns do not, however, provlde low cost seatlng.
Thus, it would be desirable to comblne the beneflts of ergonomic deslgn lnto a low cost, stackable chalr.
SUMMARY OF THE INVENTION
The lnvention provldes a chalr, comprlslng: a. a seat portlon havlng a shape adapted to engage a user's seat;
b. a back portlon generally perpendlcular to sald seat portlon and adapted to engage a user's back and havlng upper, lntermedlate and lower regions; c. a frame for holdlng and supportlng sald seat and back portlons, sald frame comprlslng:
i. a palr of rear support legs each plvotally connected to the lntermedlate reglon of sald back portlon and extendlng downward to a floor surface wlth sald rear support legs spaced - 1- ~r-B
2~802~8 apart more than the wldth of the seat portlon; and 11. a palr of front support legs each plvotally connected to the lower region of sald back portion and extending forward to support sald seat portlon, and downward to sald floor surface; whereby the weight of the user urges the back portion to plvot wlth respect to the frame toward an erect posltlon and pressure of the user's back agalnst the upper region of the back portlon can plvot the back portlon toward a tllted posltlon.
The lnventlon also provldes a chalr, comprising: a seat having an upper horizontal supportlng surface adapted to engage a user's seat; a back generally perpendicular to sald seat and adapted to engage a user's back and havlng a top and a bottom and upper and lower reglons between the top and bottom; and means for holdlng and supportlng said seat and back, comprising a palr of support legs one at each slde of the seat wlth each support leg havlng a reslllent back leg portlon attached by a flrst plvotal connectlon means to the upper reglon of sald back below the top, a bottom leg portlon for extending along a floor surface, and a front leg portlon extending upwardly to the front of sald seat to support said seat, and a second pivotal connectlon means connectlng the rear of the seat to the lower reglon of the back at a locatlon substantially above the upper horlzontal supportlng surface of said user's seat, the flexlbllity of the legs and the flrst and second plvotal connectlon means permlttlng the back to tllt toward a reclining positlon whlle the back functlons as a lever against the resillency of the back leg portlon forcing the bottom of the back forwardly for lumbar support.
The invention further provides a seat back adapted :~B
20802~8 to engage a user's back for use ln a chalr having a flexlng frame whlch flexes when a user leans back ln said chair, and support means which are adapted to engage said seat back comprlsing A. a seat adapted to engage a user's seat, B. a curved seat back portlon adapted to engage the user's back and plvot with respect to the seat in two directions between an upright position and a reclined position responsive to the flexing of the chair, C. a shaft connected to the frame and having a pair of coaxial pivot sections each coupled to opposlte sides of the seat back and an intermediate section spaced apart from the axis of the pivot sections so that the lntermediate section moves with respect to the back as the back and shaft pivot with respect to each other, D. stop surfaces on the back spaced apart from the axis of the pivot sections for engaging the intermediate section to provide plvotal llmlts in both the upright and reclined positions, and E. wlth the shaft and the flexing frame of the chalr reslllently urglng the back into the upright positlon whereby the frame ls reslliently biased at rest so that the back is in the upright position and whereby pressure of the user's back against the chair back causes the back to tilt wlth respect to the seat toward, but not beyond the reclined positions.
Ergometric ad~ustment of the chair is accomplished by tlltlng of the back portion and flexure of the frame, and flexure of the frame urges the back portion into a normal upright position for stacklng and uniform appearance. The back portion is preferably curved and hollow, and engages the frame at upper and lower curved sections of the frame, whlch sectlons have radll of curvatures less than that of the back - 2a -B
portion and whlch sections are posltloned at a downward angle such that the effectlve horlzontal radll of the sectlons ln the uprlght posltlon ls shorter than the actual radli, causlng the back portion to rest agalnst the curved sectlons and llmlt forward tlltlng of the chalr back. When the back portlon ls tilted, the radial movement disengages the back portlon from the curved sectlons due to the dlfference ln radli, untll the angle of tllt ls such that the effectlve radll are agaln equal and the back portlon agaln rests agalnst the curved sectlons of the frame and limlts tlltlng backward.
A better understanding of the features and advantages of the present inventlon will be obtained by reference to the followlng detalled descrlptlon of the lnventlon and accompanylng drawlngs whlch set forth an illustrative embodlment ln which the prlnclples of the invention are utillzed.
BRIEF DESCRIPTION OF THE DRAWINGS
Flg. 1 ls a chalr built accordlng to the present inventlon.
Flg. 2 ls the preferred embodlment of a chalr bullt accordlng to the present lnventlon.
Figs. 3-5 are views taken across section 3-3 of Flg.
1 and showlng the chalr extendlng through lts range of backward tllt.
- 2b -WO91/15139 2 08 02~ 8 ;~PcT/us9l/02305 Fig. 6 is a view taken across Section 6-6 of 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 Ihv~NllON
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 W O 91/15139 2 0 8 02~ 8 PC~r/US91/02305 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 dl 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-WO91/15139 2 0 8 0 2 4 8 CT/US9l/02305 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 W O 91/15139 2 ~ 8 0 2 4 8 -6- PC'r/US91/02305 above-described embodiment, but rather defined by the accompanying claims.
The lnventlon also provldes a chalr, comprising: a seat having an upper horizontal supportlng surface adapted to engage a user's seat; a back generally perpendicular to sald seat and adapted to engage a user's back and havlng a top and a bottom and upper and lower reglons between the top and bottom; and means for holdlng and supportlng said seat and back, comprising a palr of support legs one at each slde of the seat wlth each support leg havlng a reslllent back leg portlon attached by a flrst plvotal connectlon means to the upper reglon of sald back below the top, a bottom leg portlon for extending along a floor surface, and a front leg portlon extending upwardly to the front of sald seat to support said seat, and a second pivotal connectlon means connectlng the rear of the seat to the lower reglon of the back at a locatlon substantially above the upper horlzontal supportlng surface of said user's seat, the flexlbllity of the legs and the flrst and second plvotal connectlon means permlttlng the back to tllt toward a reclining positlon whlle the back functlons as a lever against the resillency of the back leg portlon forcing the bottom of the back forwardly for lumbar support.
The invention further provides a seat back adapted :~B
20802~8 to engage a user's back for use ln a chalr having a flexlng frame whlch flexes when a user leans back ln said chair, and support means which are adapted to engage said seat back comprlsing A. a seat adapted to engage a user's seat, B. a curved seat back portlon adapted to engage the user's back and plvot with respect to the seat in two directions between an upright position and a reclined position responsive to the flexing of the chair, C. a shaft connected to the frame and having a pair of coaxial pivot sections each coupled to opposlte sides of the seat back and an intermediate section spaced apart from the axis of the pivot sections so that the lntermediate section moves with respect to the back as the back and shaft pivot with respect to each other, D. stop surfaces on the back spaced apart from the axis of the pivot sections for engaging the intermediate section to provide plvotal llmlts in both the upright and reclined positions, and E. wlth the shaft and the flexing frame of the chalr reslllently urglng the back into the upright positlon whereby the frame ls reslliently biased at rest so that the back is in the upright position and whereby pressure of the user's back against the chair back causes the back to tilt wlth respect to the seat toward, but not beyond the reclined positions.
Ergometric ad~ustment of the chair is accomplished by tlltlng of the back portion and flexure of the frame, and flexure of the frame urges the back portion into a normal upright position for stacklng and uniform appearance. The back portion is preferably curved and hollow, and engages the frame at upper and lower curved sections of the frame, whlch sectlons have radll of curvatures less than that of the back - 2a -B
portion and whlch sections are posltloned at a downward angle such that the effectlve horlzontal radll of the sectlons ln the uprlght posltlon ls shorter than the actual radli, causlng the back portion to rest agalnst the curved sectlons and llmlt forward tlltlng of the chalr back. When the back portlon ls tilted, the radial movement disengages the back portlon from the curved sectlons due to the dlfference ln radli, untll the angle of tllt ls such that the effectlve radll are agaln equal and the back portlon agaln rests agalnst the curved sectlons of the frame and limlts tlltlng backward.
A better understanding of the features and advantages of the present inventlon will be obtained by reference to the followlng detalled descrlptlon of the lnventlon and accompanylng drawlngs whlch set forth an illustrative embodlment ln which the prlnclples of the invention are utillzed.
BRIEF DESCRIPTION OF THE DRAWINGS
Flg. 1 ls a chalr built accordlng to the present inventlon.
Flg. 2 ls the preferred embodlment of a chalr bullt accordlng to the present lnventlon.
Figs. 3-5 are views taken across section 3-3 of Flg.
1 and showlng the chalr extendlng through lts range of backward tllt.
- 2b -WO91/15139 2 08 02~ 8 ;~PcT/us9l/02305 Fig. 6 is a view taken across Section 6-6 of 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 Ihv~NllON
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 W O 91/15139 2 0 8 02~ 8 PC~r/US91/02305 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 dl 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-WO91/15139 2 0 8 0 2 4 8 CT/US9l/02305 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 W O 91/15139 2 ~ 8 0 2 4 8 -6- PC'r/US91/02305 above-described embodiment, but rather defined by the accompanying claims.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A chair, comprising:
a. a seat portion having a shape adapted to engage a user's seat;
b. a back portion generally perpendicular to said seat portion and adapted to engage a user's back and having upper, intermediate and lower regions;
c. a frame for holding and supporting said seat and back portions, said frame comprising i. a pair of rear support legs each pivotally connected to the intermediate region of said back portion and extending downward to a floor surface with said rear support legs spaced apart more than the width of the seat portion; and 11. a pair of front support legs each pivotally connected to the lower region of said back portion and extending forward to support said seat portion, and downward to said floor surface;
whereby the weight of the user urges the back portion to pivot with respect to the frame toward an erect position and pressure of the user's back against the upper region of the back portion can pivot the back portion toward a tilted position.
a. a seat portion having a shape adapted to engage a user's seat;
b. a back portion generally perpendicular to said seat portion and adapted to engage a user's back and having upper, intermediate and lower regions;
c. a frame for holding and supporting said seat and back portions, said frame comprising i. a pair of rear support legs each pivotally connected to the intermediate region of said back portion and extending downward to a floor surface with said rear support legs spaced apart more than the width of the seat portion; and 11. a pair of front support legs each pivotally connected to the lower region of said back portion and extending forward to support said seat portion, and downward to said floor surface;
whereby the weight of the user urges the back portion to pivot with respect to the frame toward an erect position and pressure of the user's back against the upper region of the back portion can pivot the back portion toward a tilted position.
2. A chair, comprising a seat having an upper horizontal supporting surface adapted to engage a user's seat;
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 means for holding and supporting said seat and back, comprising:
a pair of support legs one at each side of the seat with each support leg having a resilient back leg portion attached by a first pivotal connection means to the upper region of said back below the top, a bottom leg portion for extending along a floor surface, and a front leg portion extending upwardly to the front of said seat to support said seat, and a second pivotal connection means connecting the rear of the seat to the lower region of the back at a location substantially above the upper horizontal supporting surface of said user's seat, the flexibility of the legs and the first and second pivotal connection means permitting 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.
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 means for holding and supporting said seat and back, comprising:
a pair of support legs one at each side of the seat with each support leg having a resilient back leg portion attached by a first pivotal connection means to the upper region of said back below the top, a bottom leg portion for extending along a floor surface, and a front leg portion extending upwardly to the front of said seat to support said seat, and a second pivotal connection means connecting the rear of the seat to the lower region of the back at a location substantially above the upper horizontal supporting surface of said user's seat, the flexibility of the legs and the first and second pivotal connection means permitting 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.
3. The chair of claim 2 with the chair back pivotal with respect to the seat between upright and reclined positions in which at least one of the pivotal connections means in the upper and lower regions of the back comprises:
A. a shaft having a pair of coaxial pivot sections each coupled to opposite sides of the seat back and an intermediate section spaced apart from the axis of the pivot sections so that the intermediate section moves with respect to the back as the back and shaft pivot with respect to each other, B. stop surfaces on the back spaced apart from the axis of the pivot sections for engaging the intermediate section to provide pivotal limits in both the upright and reclined positions, and C. with the shaft and the resilient back leg portion of the chair resiliently urging the back into the upright position whereby the frame is resiliently biased at rest so that the back is in the upright position and whereby pressure of the user's back against the chair back causes the back to tilt with respect to the seat toward, but not beyond the reclined position.
A. a shaft having a pair of coaxial pivot sections each coupled to opposite sides of the seat back and an intermediate section spaced apart from the axis of the pivot sections so that the intermediate section moves with respect to the back as the back and shaft pivot with respect to each other, B. stop surfaces on the back spaced apart from the axis of the pivot sections for engaging the intermediate section to provide pivotal limits in both the upright and reclined positions, and C. with the shaft and the resilient back leg portion of the chair resiliently urging the back into the upright position whereby the frame is resiliently biased at rest so that the back is in the upright position and whereby pressure of the user's back against the chair back causes the back to tilt with respect to the seat toward, but not beyond the reclined position.
4. A seat back adapted to engage a user's back for use in a chair having a flexing frame which flexes when a user leans back in said chair, and support means which are adapted to engage said seat back comprising:
A. a seat adapted to engage a user's seat, B. a curved seat back portion adapted to engage the user's back and pivot with respect to the seat in two directions between an upright position and a reclined position responsive to the flexing of the chair, C. a shaft connected to the frame and having a pair of coaxial pivot sections each coupled to opposite sides of the seat back and an intermediate section spaced apart from the axis of the pivot sections so that the intermediate section moves with respect to the back as the back and shaft pivot with respect to each other, D. stop surfaces on the back spaced apart from the axis of the pivot sections for engaging the intermediate section to provide pivotal limits in both the upright and reclined positions, and E. with the shaft and the flexing frame of the chair resiliently urging the back into the upright position whereby the frame is resiliently biased at rest so that the back is in the upright position and whereby pressure of the user's back against the chair back causes the back to tilt with respect to the seat toward, but not beyond the reclined positions.
A. a seat adapted to engage a user's seat, B. a curved seat back portion adapted to engage the user's back and pivot with respect to the seat in two directions between an upright position and a reclined position responsive to the flexing of the chair, C. a shaft connected to the frame and having a pair of coaxial pivot sections each coupled to opposite sides of the seat back and an intermediate section spaced apart from the axis of the pivot sections so that the intermediate section moves with respect to the back as the back and shaft pivot with respect to each other, D. stop surfaces on the back spaced apart from the axis of the pivot sections for engaging the intermediate section to provide pivotal limits in both the upright and reclined positions, and E. with the shaft and the flexing frame of the chair resiliently urging the back into the upright position whereby the frame is resiliently biased at rest so that the back is in the upright position and whereby pressure of the user's back against the chair back causes the back to tilt with respect to the seat toward, but not beyond the reclined positions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50671690A | 1990-04-10 | 1990-04-10 | |
| US506,716 | 1990-04-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2080248A1 CA2080248A1 (en) | 1991-10-11 |
| CA2080248C true CA2080248C (en) | 1996-10-29 |
Family
ID=24015733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002080248A Expired - Lifetime CA2080248C (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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1991
- 1991-04-03 EP EP91907969A patent/EP0539377B1/en not_active Expired - Lifetime
- 1991-04-03 KR KR1019920702522A patent/KR0182297B1/en not_active Expired - Lifetime
- 1991-04-03 DE DE69129628T patent/DE69129628T2/en not_active Expired - Lifetime
- 1991-04-03 AT AT91907969T patent/ATE167369T1/en not_active IP Right Cessation
- 1991-04-03 ES ES91907969T patent/ES2118081T3/en not_active Expired - Lifetime
- 1991-04-03 AU AU76916/91A patent/AU651971B2/en not_active Expired
- 1991-04-03 WO PCT/US1991/002305 patent/WO1991015139A1/en active IP Right Grant
- 1991-04-03 CA CA002080248A patent/CA2080248C/en not_active Expired - Lifetime
- 1991-04-03 IL IL9776291A patent/IL97762A/en not_active IP Right Cessation
- 1991-04-03 JP JP3507861A patent/JPH0815446B2/en not_active Expired - Lifetime
- 1991-04-08 NZ NZ237726A patent/NZ237726A/en unknown
-
1997
- 1997-01-23 US US08/786,994 patent/USRE36335E/en not_active Expired - Lifetime
- 1997-04-07 JP JP9103917A patent/JP3065274B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| IL97762A0 (en) | 1992-06-21 |
| JPH0815446B2 (en) | 1996-02-21 |
| WO1991015139A1 (en) | 1991-10-17 |
| ATE167369T1 (en) | 1998-07-15 |
| JP3065274B2 (en) | 2000-07-17 |
| JPH05507632A (en) | 1993-11-04 |
| NZ237726A (en) | 1994-08-26 |
| JPH1033294A (en) | 1998-02-10 |
| AU651971B2 (en) | 1994-08-11 |
| DE69129628T2 (en) | 1998-10-15 |
| DE69129628D1 (en) | 1998-07-23 |
| CA2080248A1 (en) | 1991-10-11 |
| EP0539377A1 (en) | 1993-05-05 |
| ES2118081T3 (en) | 1998-09-16 |
| AU7691691A (en) | 1991-10-30 |
| KR0182297B1 (en) | 1999-05-01 |
| IL97762A (en) | 1994-08-26 |
| EP0539377A4 (en) | 1993-06-16 |
| EP0539377B1 (en) | 1998-06-17 |
| USRE36335E (en) | 1999-10-12 |
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| EEER | Examination request | ||
| MKEX | Expiry |