Nestable and stackable chair
A chair is provided comprising a seat assembly including a seat back and a seat bottom and a support frame including a left leg assembly and right leg assembly connected by a transverse support member. The seat back is pivotably connected to each of the leg assemblies such that an upper portion of the seat back pivots in relation to the leg assemblies between a first seat back position and a second seat back position. The seat bottom is rotatable in relation to the seat back between an upright position and a horizontal position. The seat bottom is slidingly engaged with the leg assemblies such that pivoting of the seat backward from the first seat back position to the second seat back position causes the seat bottom to slide forward from a first seat bottom position to a second seat bottom position.
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The present invention relates generally to the field of seating and in particular to a reclining chair that is stackable and nestable.
Chairs for extended seating applications, such as banquet halls and conference rooms, should preferably be comfortable, durable, and either stackable or nestable for storage purposes. Traditional stackable banquet chairs include a pair of inverted-U-shaped leg members attached to opposite sides of a generally horizontal seat. A generally L-shaped back support frame interconnects with the leg members and extends upwardly from the rear of the seat to support a back cushion. This type of chair may be stacked by placing the inverted-U-shaped leg members of one chair over the top of the leg members of another chair, such that the seat of the upper chair is supported just above the seat of the lower chair. Examples of traditional stackable banquet chairs are shown in U.S. Pat. No. 3,102,733 to Burnett and U.S. Design Pat. No. 180,996 to Cramer. While this type of chair has wide applicability, many people prefer chairs that do not look like a traditional stacking chair. These traditional stacking chairs have the leg members completely exposed at the sides of the chairs. Some users prefer legs or leg members that are less visible.
The above-described chair is generally referred to as a stacking chair, because the leg members of one chair rest directly on the leg members of a lower chair creating a secure leg-on-leg stack. Multiple chairs may be securely stacked on top one another with this design.
An alternative to stacking chairs are so-called nesting chairs. Nesting chairs come in a variety of styles and are distinguished from stacking chairs in that the underside of a seat frame of one chair rests atop the seat cushion of a lower chair when the chairs are nested. An example of such a nesting chair is illustrated in U.S. Pat. No. 5,524,963 to Barile. An advantage with nesting chair designs is that the chair designer may configure the chair legs to be less exposed than with traditional stacking chairs.
Modem consumers require comfort and style in their chairs, but also demand cost-effective solutions given the highly competitive furniture industry. Further, the chairs must be durable and rugged, yet preferably mechanically simple, easily assembled, lightweight, and low-cost. Still further, many consumers want a modern appearance and a chair design that takes advantage of modern materials, part-forming processes, and assembly techniques. Often consumers need chairs that are mobile and that can be stored in dense arrangements that minimize the storage space required.
A problem is that these requirements create conflicting design criteria. For example, low-cost chairs tend to be less comfortable and less stylized. Chairs that are more comfortable, such as so-called “synchrotilt” chairs, have more expensive components and greater assembly costs, are neither stackable nor nestable for dense storage, and are usually too heavy to be lifted and/or stacked for storage.
A need has remained for a chair combining the benefits of an ergonomic design in a stackable and/or nestable chair.
SUMMARY OF THE INVENTIONIn order to address these needs, the present invention contemplates a chair comprising a seat assembly including a seat back and a seat bottom and a support frame including a left leg assembly and right leg assembly connected by a transverse support member, each of the leg assemblies including a seat back support member. The seat back is pivotably connected to each of the seat back support members such that an upper portion of the seat back pivots in relation to the seat back support members between a first seat back position and a second seat back position. The seat bottom is rotatably connected to a lower portion of the seat back such that the seat bottom is rotatable in relation to the seat back between an upright position and a horizontal position. The seat bottom is slidingly engaged with the seat back support members such that pivoting of the upper portion of the seat backward from the first seat back position to the second seat back position causes the lower portion of the seat back to pivot forward thereby causing the seat bottom to slide forward in relation to the seat back support members from a first seat bottom position to a second seat bottom position.
The configuration of the support frame and seat assembly allows the chair to be stacked with other chairs having a similar configuration when the seat bottom is in the horizontal position. Moreover, the same configuration allows the chair to be nested with other chairs having a similar configuration when the seat bottom is in the upright position.
The left and right leg assemblies may be comprised of a front leg member and a rear leg member connected in a criss-cross configuration. Lower portions of the front leg members and the rear/leg members may be continuously downwardly curved from the crossing point of the front leg member and the rear leg member such that the front leg member and the rear leg member exhibit an arched configuration in profile that provides a sturdy base for supporting and distributing the weight of a person sitting in the chair.
In a preferred embodiment, the seat back includes a back panel and a left and right upright support member. An upper portion of each upright support member is attached to lateral ends of said back panel. A central portion of the left and right upright support members is pivotably connected to the respective seat back support members.
The seat bottom preferably includes left and right laterally extending attachment members for rotatably connecting to a lower portion of said left and right upright support members. The lower portions of the upright support members are preferably located in a pivot guide channel inside the respective seat back support members when the upright support members are pivotably attached to the seat back support members. The seat back support members may each have an opening to the pivot guide channel on an inboard side of each of the respective seat back support members. The lower portions of the upright support members and the left and right attachment members of the seat bottom may be rotatably connected through the respective openings. The opening may act as a slide guide to guide the sliding of the seat bottom between the first seat bottom position and the second seat bottom position.
In some embodiments, the seat back support members include a biasing element for biasing the lower portions of the upright support members backward thereby pivoting the upper portions of the upright support members back into the first seat back position.
Accordingly, it is one object of the invention to provide an ergonomic chair that includes features that allow a user to easily recline the chair while the seat back maintains support for the user's back. Another object is achieved by features of the invention that allow the chair to not only recline, but also be easily stacked or nested when not in use.
These and other objects and benefits of the invention will be readily discerned from the following written description, taken together with the accompanying figures.
DESCRIPTION OF THE FIGURES
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and described in the following written specification. It is understood that no limitation to the scope of the invention is thereby intended. It is further understood that the present invention includes any alterations and modifications to the illustrated embodiments and includes further applications of the principles of the invention as would normally occur to one skilled in the art to which this invention pertains.
The present invention provides a chair with a synchronously moving seat and seat back. The seat slides forward as the seat back tilts rearward to provide a reclined seating position in response to the natural forward movement of the seated user's pelvis along with the user leaning against the seat back. The biasing spring of the seat allows it to return to an upright seating position when the pressure on the seat back is removed. The chair includes a fold-up seat that allows the chair to be stacked vertically or nested horizontally to suit a wide variety of storage needs.
Referring to the drawings, a chair 10 in accordance with one embodiment of the invention is illustrated in
Preferably, the front leg members 40, 44 and the rear leg members 50, 54 are formed of a sturdy tubular metal such as aluminum or steel, for example. The tubular legs may have a wall thickness of about 1/16th inch. In one particular embodiment, portions of the tubular front leg members and rear leg members may be constructed with a “double-d” configuration, as depicted in the cross-sectional view of
Preferably, the seat back support members 38 of the leg assemblies are integral with the front leg members 40, 44 as seen in
The rear leg members 50, 54 may include an arm portion 58, 60 in some embodiments. In these embodiments, an arm rest 64, 68 is attached at an upper end of the arm portion 58, 60 and has a free end that extends in a rearward direction from the upper end of the arm portion 58, 60 of the leg members 50, 54. Preferably, the arm rest 64, 68 is not attached to any portion of the seat assembly so it will remain stationary with respect to movement of the seat assembly as shown in
For certain features of the invention, the configurations of the leg members are not critical and any suitable design is contemplated. Other suitable configurations include, but are not limited to, sled, cantilever and caster-based styles (See, e.g.,
Referring now to
Referring now to
A lower portion 94 of the upright support member 88 includes an opening 100 therethrough for receiving the laterally extending members 78, 80 of the seat bottom 18. The laterally extending members 78, 80 may translate and rotate within the opening 100 so that the seat bottom 18 may be rotated into an upright position (as shown in
The back panel 84 and seating surface 70 may be curved to adapt to a user's body for comfort. The back panel and seating surface may be formed of any suitable material and may be cushioned or padded for additional comfort. The comfort and durability of the chair may be further enhanced by providing a back panel and seating surface that are formed of a relatively flexible material that flexes, bends, or deflects slightly in response to, and proportional to, a user's weight such as, for example, molded plastic or a multiple ply wood. The walls of the back panel and seating surface may be of generally uniform thickness, but may have increased thickness where required for strength. Stiffening ribs or flanges may also be added as required.
The seat back support member 38 is operable to allow the seat back portion of the chair 10 to pivot, or tilt, rearwardly while the seat bottom slides forward. Details of the member 38 are best understood with reference to
Once inserted into the pivot guide channel 114, the lower portion 94 of the upright support member extends into the lower portion 110 of the seat back support member 38. The seat back support member 38 further includes a slide guide opening 120 (
As the lower portion 94 of the upright support member is pivoted into the reclined position, the slotted opening 100 of the lower portion 94 of each upright support member is moved in a forward arc A within the pivot guide channel 114. Thus, the slotted opening 100 is displaced vertically and horizontally while moving from the upright position (
It can be appreciated that the interface between the attachment members 78, 80 and the slotted openings 100 couple the seat bottom 18 and seat back 20 to move in synchronization. Backward tilting of the seat back causes forward movement of the seat bottom. Backward movement of the seat bottom causes forward tilting of the seat back. In one feature of the invention, this coupling of seat bottom and seat back movement does not compromise the ability to rotate the seat bottom to its nesting position, as illustrated in
The seat back support member 38 preferably further includes a biasing element 124 for biasing the seat back portion into the upright position (
In the preferred embodiment, the interface between the spring 130 and the lower portion 94 is facilitated by a yoke element 134, as illustrated in
When a person sitting in the chair leans back with sufficient force to overcome the biasing force in the springs 130, the springs 130 compress and allow the lower portion 94 of the upright support member to pivot forward and the upper portion 90 to pivot backward into the reclined position (
Referring back to
The seat stops 135 may be any suitable member or device that is capable of supporting the seat bottom 18 when a person is seated on the chair. In a specific embodiment, the seat stop 135 includes a busing 135a that projects inwardly from each of the left and right support portions 44 of the support frame. The bushings 135a may be formed of any hard, durable material, such as, for example, a hard plastic. The bushings 135a are preferably attached to the inboard side of the respective support portion of the support frame in a way that allows the bushings to pivot to act as a roller as the seat bottom 18 moves back and forth. One suitable attachment is by a carriage bolt 135b passing through the bushing and threaded into the frame.
When the seat bottom is in the upright position (
In accordance with a further feature of certain embodiments, the cover fin 138 includes a first detent 140 configured to prevent the seat bottom 18 from freely falling from the upright position to the horizontal position. The first detent 140 may comprise a protrusion on the outboard side of the cover fin 138. When the seat bottom 18 is rotated to the upright position, the cover fin 138 slides along the edge of the slide guide opening 120. Once the seat bottom has reached the upright position, the first detent slides into a position just inside the rim of the slide guide opening 120 as shown in
The cover fin 138 may further include a second detent 144 configured to prevent rotation of the seat bottom 18 upward past the upright position. The detent 144 projects laterally outward from the cover fin. When the seat bottom 18 is rotated upward and the first detent 140 has passed into the slide guide opening, the second detent 144 is positioned to catch on the outside rim of the slide guide opening 120 to prevent further rotation of the seat bottom.
Referring now to
As discussed above, the positioning of the leg members and the rotatability of the seat bottom allows the chair 10 to be stacked and nested with other similar chairs to facilitate storage. This capability is shown in
When nesting the chairs horizontally, as shown in
Referring again to
While the invention has been illustrated and described in detail in the drawings and foregoing description, the same should be considered as illustrative and not restrictive in character. It is understood that only the preferred embodiments have been presented and that all changes, modifications and further applications that come within the spirit of the invention are desired to be protected
Claims
1. A chair comprising:
- a support frame having ground engaging legs;
- a seat back connected to said support frame;
- a seat bottom is connected to said support frame to rotate relative to said support frame between a horizontal position and an upright position and to slide forward and backward in relation to said support frame between a first seat bottom position and a second seat bottom position.
2. The chair of claim 1, wherein said seat back is pivotably connected to said support frame to pivot between a first generally upright position and a second relatively reclined position.
3. The chair of claim 2, wherein:
- said seat back includes an upper portion for supporting the back of a person seated in the chair and an opposite lower portion: and
- said seat bottom is connected to said lower portion of said seat back so that pivoting of said seat back causes said seat bottom to slide in relation to said support frame.
4. The chair of claim 1, wherein said support frame is configured to allow the chair to be stacked with other chairs having a similar support frame configuration when said seat bottom is in the horizontal position.
5. The chair of claim 4, wherein said support frame is further configured to allow the chair to be nested with other chairs having a similar support frame configuration when said seat bottom is in the upright position.
6. The chair of claim 1, wherein said support frame is configured to allow the chair to be nested with other chairs having a similar support frame configuration when said seat bottom is in the upright position.
7. A chair, comprising:
- a seat assembly including a seat back and a seat bottom; and
- a support frame including a left leg assembly and right leg assembly connected by a transverse support member, each of said leg assemblies including a seat back support member;
- wherein said seat back is pivotably connected to each of said seat back support members such that an upper portion of said seat back pivots in relation to said seat back support members between a first seat back position and a second seat back position;
- wherein said seat bottom is rotatably connected to a lower portion of said seat back such that said seat bottom is rotatable in relation to the seat back between an upright position and a horizontal position; and
- wherein said seat bottom is slidingly engaged with said seat back support members such that pivoting of said upper portion of said seat backward from said first seat back position to said second seat back position causes said lower portion of said seat back to pivot forward thereby causing said seat bottom to slide forward in relation to said seat back support members from a first seat bottom position to a second seat bottom position.
8. The chair of claim 7, wherein:
- each of said left and right leg assemblies further includes a front leg member and a rear leg member operably connected in a criss-cross configuration; and
- said lower portions of said front leg members and said rear/leg members are continuously downwardly curved from a crossing point of said front leg member and said rear leg member such that said front leg member and said rear leg member exhibit an arched configuration in profile.
9. The chair of claim 8, wherein said front leg members and said rear leg members are formed of a tubular metal having a “double-d” configuration.
10. The chair of claim 8, wherein:
- said seat back support member comprises an upper portion of said front leg members; and
- an upper portion of said rear leg member extends above said seat back support member and includes an arm rest extending rearwardly from said upper portion of said rear leg member.
11. The chair of claim 7, wherein:
- said seat back includes a back panel and a left and right upright support member, an upper portion of each upright support member being attached to lateral ends of said back panel; and
- a central portion of said left and right upright support members is pivotably connected to a respective one of said seat back support members.
12. The chair of claim 11, wherein said seat bottom includes left and right laterally extending attachment members, said left and right attachment members being rotatably connected to a lower portion of said left and right upright support members.
13. The chair of claim 12, wherein said lower portions of said upright support members are located in a pivot guide channel inside respective said seat back support members when said upright support members are pivotably attached to respective said seat back support members.
14. The chair of claim 13, wherein each of said seat back support members has an opening to said pivot guide channel on an inboard side thereof, said lower portions of said upright support members and said left and right attachment members of said seat bottom being rotatably connected through said respective openings.
15. The chair of claim 14, wherein said opening includes a slide guide, said left and right attachment members being slidingly engaged with said slide guide, said slide guide being configured to guide said seat bottom between said first seat bottom position and said second seat bottom position.
16. The chair of claim 12, wherein each of said seat back support members includes a biasing element for biasing said lower portions of said upright support members backward thereby pivoting said upper portions of said upright support members seat back into said first seat back position.
17. The chair of claim 7, wherein said support frame includes a seat stop configured to stop downward rotation of said seat bottom at said horizontal position.
18. The chair of claim 17, wherein said seat bottom includes a ramp member on a bottom side of said seat bottom in a position to engage said seat stop during sliding movement of said seat bottom, said ramp member being configured to tilt a front portion of said seat bottom upwards when said seat bottom slides forward into said second seat bottom position.
19. The chair of claim 14, wherein said seat bottom includes a cover fin, said cover fin being configured to cover said opening when said seat bottom is in said upright position.
20. The chair of claim 19, wherein said cover fin includes a first detent for engaging said opening when said seat bottom is in said upright position, said detent being configured to releasably retain said seat bottom in said upright position.
21. The chair of claim 20, wherein said cover fin further includes a second detent for engaging said opening when said seat bottom is in said upright position, said second detent being configured to prevent rotation of said seat bottom upward past said upright position.
22. The chair of claim 7, wherein said front leg members are positioned closer together than said rear leg members so that said chair is vertically stackable with similarly configured chairs when said seat bottom is in said horizontal position.
23. The chair of claim 22, wherein said chair is horizontally nestable with similarly configured chairs when said seat bottom is in said upright position.
24. The chair of claim 23, further comprising a stack nest bumper located on a bottom portion of each of said front leg members.
25. A chair comprising:
- a seat assembly including a seat back and a seat bottom; and
- a support frame including a pair of tubular front leg members and a pair of tubular rear leg members, a lower portion of said tubular front leg members and rear leg members having a “double-d” configuration.
26. The chair of claim 25, wherein said lower portions of said front leg members are continuously downwardly curved such that said front leg members exhibit an arched configuration in profile.
27. A chair comprising:
- a seat back;
- a seat bottom;
- a support frame connected to said seat back and seat bottom and having a pair of front legs and a pair of rear legs, said front and rear legs configured and arranged to allow the chair to be stacked with other chairs having a similar support frame configuration when said seat bottom is in the horizontal position; and
- at least one stack/nest bumper positioned on a bottom portion of said pair of front legs to contact an upper portion of said front legs of another chair on which said chair is stacked.
28. A chair comprising:
- a seat assembly including a seat back and a seat bottom; and
- a support frame including a left leg assembly and right leg assembly connected by a transverse support member, each of said leg assemblies including a seat back support member, said seat back support members each including a pivot guide channel and a slide guide opening;
- wherein said seat bottom is rotatably and slidingly supported in said pivot guide channel through said slide guide opening such that said seat bottom rotates in relation to said seat back support members between a horizontal and an upright position and slides in relation to said seat back support members between a first seat bottom position and a second seat bottom position; and
- wherein said seat bottom further includes a cover fin configured to cover an exposed portion of said slide guide opening when said seat bottom is in said upright position.
29. The chair of claim 28, wherein said cover fin includes a first detent configured to releasably retain said seat bottom in said upright position.
30. The chair of claim 29, wherein said first detent has a ramped leading end and a substantially flat trailing end, said ramped leading end being configured to allow said cover fin to slide past a rim of said slide guide opening, said flat trailing end being configured to abut against an inner lower portion of said slide guide opening to releasably restrain said seat bottom.
31. The chair of claim 28, wherein said cover fin includes a second detent configured to limit the upward rotation of said seat bottom to said upright position.
32. A chair comprising:
- a support frame having ground engaging legs;
- a seat back connected to said support frame;
- a seat bottom connected to said support frame to rotate between a horizontal position and an upright position, and to slide forward and backward in relation to said support frame between a first seat bottom position and a second seat bottom position;
- a seat stop mounted to said support frame in an orientation to prevent said seat bottom from rotating downward past said horizontal position; and
- a ramp member mounted to said seat bottom to contact said seat stop, said ramp member configured to cooperate with said seat stop to tilt a front portion of said seat bottom upward when said seat bottom slides from said first seat bottom position to said second seat bottom position.
33. A chair comprising:
- a support frame having ground engaging legs;
- a seat back pivotably connected to said support frame to pivots between a generally upright position and a relatively reclined position;
- a seat bottom is connected to said support frame to rotate relative to said support frame between a horizontal position and an upright position and to slide forward and backward in relation to said support frame between a first seat bottom position and a second seat bottom position;
- a coupling between said seat bottom and said seat back operable so that pivoting of said seat back causes said seat bottom to slide in relation to said support frame; and
- a biasing element between said coupling and said support frame configured to bias said seat back into said upright position.
34. The chair of claim 33, wherein:
- said support frame includes a left leg assembly and right leg assembly connected by a transverse support member, each of said leg assemblies including a seat back support member; and
- said biasing element comprises a biasing spring in a spring guide channel formed in each of said seat back support members.
Type: Application
Filed: Mar 21, 2006
Publication Date: Sep 27, 2007
Applicant: Ditto Sales, Inc. (Jasper, IN)
Inventors: Roberto Lucci (Como), Paolo Orlandini (Milano)
Application Number: 11/385,207
International Classification: A47C 1/00 (20060101);