Chair Construction

Abstract

Chair construction having independent back and seat support means, preferably including a pair of substantially identical side frame members of tubular metal or the like having generally U-shaped configuration. The back and the seat are secured to the side frame members, but move independently of each other without the assistance of springs or other tensioning means. One of the upwardly-extending shanks of each U-shaped side frame member terminates in a loop which provides an arm rest, and the bight of each side frame member provides a base means.

Description

BACKGROUND OF THE INVENTION

This invention relates to a chair construction and more particularly to a chair construction which is relatively simple while providing a chair which is light in weight and which provides firm but comfortable support for the user. The chair may be shipped disassembled in a compact package and can be readily assembled for use.

Numerous chairs have been proposed in the prior art using metal frame members, usually tubular, bent to form back and seat supports and providing resiliency for flexure in use. Such chairs have been relatively inexpensive but have had a number of disadvantages. For example, such chairs have not provided the proper support for the user, being generally uncomfortable especially when used for an extended period of time. Prior art chairs have also been bulky to ship, even when shipped disassembled. Additionally, when prior art chairs have been shipped disassembled, they have been difficult to assemble for use. This invention has been evolved with the general object of overcoming the disadvantages of prior art chairs and of providing a light-weight chair which provides firm, comfortable support for the user.

Another object of the invention is to provide a chair which can be shipped disassembled in a compact package and which can be readily assembled for use.

A further object of the invention is to provide a chair having a minimum number of component parts and which is readily and economically manufacturable.

Yet another object of the invention is to provide side frame members which are adapted for use with seats and backs of various constructions to provide complete chairs.

Still other objects, features and advantages of this invention will become more fully apparent from the following detailed description, taken in conjunction with the accompanying drawing.

SUMMARY OF THE INVENTION

According to the invention, a chair is provided in which a seat and a back are independently supported from a pair of spaced side frames which are preferably adapted to flex in a manner such as to allow resiliently restrained backward movement of the back and resiliently restrained downward movement of the seat. With this arrangement, the chair provides firm but very comfortable support and can be used for extended periods of time without fatique.

This invention contemplates a chair which comprises a pair of spaced, flexible side frames. Each side frame is formed from a single elongated member and includes a back-supporting portion adjacent one end of the elongated member, a rear leg portion connected to the back-supporting portion and extending downwardly therefrom, a base portion connected to the rear leg portion and extending forwardly substantially horizontally therefrom, and a front leg portion connected to the base portion and extending upwardly therefrom. In addition, an arm-supporting portion is connected to the front leg portion and curves rearwardly toward the back-supporting portion, and a seat-receiving portion, situated adjacent to the other end of said elongated member, is connected to the arm-supporting portion and curves downwardly therefrom and from the back-supporting portion, and also extends forwardly toward the front leg portion. A back means is positioned between the aforesaid back-supporting portions of the side frames and is secured thereto, and a seat means is positioned between the seat-receiving portions of the side frames and is secured thereto.

According to a specific feature of this invention, a pair of spaced side frame members having a generally U-shaped configuration are provided and are connected together by the seat and by the back. The bight of each side frame member defines a base means. An integral, first upwardly-extending shank of each side frame member is secured to the back, and an integral second upwardly-extending shank of each side frame member is secured to the seat. Preferably the terminal portion of first upwardly-extending shank is angled rearwardly and the rest of first upwardly-extending shank is angled forwardly relative to the bight, and the second upwardly-extending shank terminates in a rearwardly-extending and downwardly-depending loop which defines arm rests and provides connecting sites for the seat at the terminal portion of the loop. In such manner flexure of the seat-supporting portions allows resiliently restrained movement of the seat, primarily in a downwardly direction, and to a limited extent, in a rearward direction. The result of this support of the seat, combined with the independent back support, is a chair which is firm but very comfortable.

To secure the back and the seat to the side frame members, a plurality of transverse openings is provided in the first upwardly-extending shank and in the loop portion of the side frame members through which fastening elements such as screws or bolts are extended. With this feature, and with each side frame member being in a common generally vertical plane, the side frame members can be substantially identical, thereby facilitating manufacture and also permitting shipping of the chair "knocked down" or disassembled in a compact package, the chair being readily assembled for use.

BRIEF DESCRIPTION OF THE DRAWING

In the drawing,

FIG. 1 is a perspective view of a chair construction according to the invention;

FIG. 2 is a side elevational view of the chair of FIG. 1 with portions broken away to show interior detail; and

FIG. 3 is a sectional view, on an enlarged scale, taken along line 3--3 of FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the FIGURES, reference numeral 10 generally designates a chair constructed in accordance with the principles of the invention. Chair 10 comprises seat 11, back 12 and a pair of spaced, substantially identical side frame members 13 and 14, preferably of tubular metal, and most preferably of stainless steel tubing. Side frame member 13 is similar to side frame member 14 and comprises first upwardly-extending shank 15 extending generally vertically, including terminal portion 15a secured against one side of back 12 and preferably angled rearwardly and the rest or main portion 15b which is preferably angled forwardly, both relative to base means such as bight 16.

Second upwardly-extending shank 17 extends upwardly from the forward end of bight 16 and terminates in rearwardly-extending and downwardly-depending loop 18 which provides arm rest 19. Terminal portion 20 of loop 18 extends forwardly toward shank 17 and provides connecting sites for seat 11 which is secured to terminal portion 20 and to the corresponding portion of member 14 at opposite sides. A pair of screws 21 and 22 is provided for securing terminal portion 20 to one side of seat 11 and another pair of screws 23 and 24 is provided for securing terminal portion 15a to one side of back 12. As shown in FIG. 3, screw 21 includes a head portion 21a and elongated portion 21b, the elongated portion 21b being extended through sleeve 26 and through opening 27 provided in the inside wall of terminal portion 20. Opening 27 has an inside diameter just slightly larger than the outside diameter of elongated portion 21b. Preferably, opening 28 is provided in the outside wall of terminal portion 20, having an inside diameter slightly larger than the outside diameter of head portion 21a and sleeve 26 has a length such as to position the outer end of head portion 21a just inside the outer surface of terminal portion 20. The illustrated head portion 21a is provided with a suitable hexagonal socket 21c for receiving an Allen wrench. A similar construction is used for screws 22, 23 and 24 and for the screws on the opposite side of the chair used to secure side frame member 14 to the opposite side of seat 11 and to the opposite side of back 12.

The chair of this invention can thus be readily assembled requiring only eight screws, four on each side. It is also noted that side frame members 13 and 14 are substantially identical, all portions of each member being in a common vertical plane. Thus with this feature, manufacture is facilitated and, also, the chair can be shipped knocked down or disassembled in a very compact package.

By way of example, side frame members 13 and 14 are of tubular stainless steel having an outer diameter of one inch and a wall thickness of approximately 3/32 inches. Suitable plugs 29 and 30 are provided for closing the ends of member 13, the reduced-diameter body portions of plugs 29 and 30 being inserted into the ends of side frame member 13 with a press fit. A similar pair of plugs is provided for side frame member 14.

In the illustrated chair 10, seat 11 is formed by a generally rectangular frame of wood including front and rear portions 31 and 32 and side portions 33 and 34, supporting cane web 35. Similarly, back 12 is formed by a generally rectangular wood frame including lower and upper portions 37 and 38 and side portions 39 and 40, supporting cane web 41. It will be understood that upholstered or other types of seats and backs such as plastic or metal seats and backs may be used, as desired.

In use, the weight of a person sitting on seat 11 causes rearward flexure of shank 17, opening of loop 18, downward flexure of arm rest 19, and flexure of terminal portion 20 downwardly. With the proportions as illustrated, seat 11 moves downwardly and slightly rearwardly, but its angular position relative to the floor is substantially unchanged. The effect of flexure of shank 17 and arm rest 19 which would tend to elevate the front of the seat 11 relative to the rear, is offset by the opening of loop 18 and the flexure of terminal portion 20 the effect of which is to lower the front of the seat relative to the rear. Arm rest 19 remains generally parallel to seat 11. Pressure against back 12 causes it to move rearwardly with flexure of shank 15. The overall result is a relatively firm but very comfortable support with which the muscles of the user are not strained.

While in the foregoing specification this invention has been described in relation to certain preferred embodiments thereof, and many details have been set forth for purpose of illustration, it will be apparent to those skilled in the art that the invention is susceptible to additional embodiments and that certain of the details described herein can be varied considerably without departing from the basic principles of the invention.

Claims

I claim:

1. A chair comprising a pair of substantially identical, spaced, flexible side frames each frame being a single elongated member and including a first upwardly-extending shank, a bight, and a second upwardly-extending shank; and first upwardly-extending shank having a terminal portion angled rearwardly and the rest angled forwardly relative to said bight and said second upwardly-extending shank terminating in a rearwardly-extending and downwardly-depending loop situated between said first and second shanks and having a forwardly-extending terminal portion which terminates short of said second upwardly-extending shank;

a back means positioned between the terminal portions of said first upwardly-extending shanks and secured thereto; and

a seat means positioned between the forwardly-extending terminal portions of said loops and secured thereto;

said back means and said seat means being substantially independent of each other and being adapted for independent movement relative to each other, said bights together forming a base for said chair, and all parts of each side frame lying in a generally vertical common plane.

2. The chair in accordance with claim 1 wherein said first upwardly-extending shanks are adapted to flex so as to allow a resiliently restrained backward movement of said back.

3. The chair in accordance with claim 1 wherein said second upwardly-extending shanks are adapted to flex so as to allow resiliently restrained downward movement of said seat.

4. The chair in accordance with claim 1 wherein said back means and said seat means are removably secured to said side frame members.

5. The chair in accordance with claim 1 wherein each of said side frames is made of an elongated tubular member.

6. The chair in accordance with claim 1 wherein each of said side frames is made of stainless steel tubing.

7. The chair in accordance with claim 1 wherein said terminal portions of the first upwardly-extending shanks are provided with a plurality of transverse openings; wherein said terminal portions of the loops are provided with a plurality of transverse openings; wherein sleeve means in said shanks surround each of said openings; wherein fastening means comprising headed, elongated fastening elements extend through said sleeve means and said openings and into said back means and said seat means; and wherein the head of each said fastening element abuts a corresponding sleeve means.