US2648372A - Chair with spring seat and back - Google Patents

Description

Aug. 11, 1953 L. A. SMITH CHAIR WITH SPRING SEAT AND BACK 2 Sheets-Sheet 1 Filed May 25; 1949 6 74 z 6 a b 5 s A O z :7 o 7 0 a n 7 w h 2 o o H (m a o m (m o m a o m 5 m p l H INVENTOR. LUTHER 0. SMITH HTTQRIVEYS Aug. 11, 1953 1.. A. SMITH 2,648,372

CHAIR WITH SPRING SEAT AND BACK Filed May 25, 1949 2 Sheets-Sheet 2 INVENTOR. LUTHER 1?. SMITH W m 1 1E1] 221 Patented Aug. 11, 1953 UNITED STATES PATENT OFFICE CHAIR WITH SPRING SEAT AND BACK Luther A. Smith, Birmingham, Ala., assignor to Southern Household Products Company, Inc., a corporation of Delaware 7 Application May 25, 1949, Serial No. 95,320

8 Claims.

My present invention relates to chairs, and while not limited thereto relates to chairs having a frame of metallic tubing and a seat and back of sheet metal.

An object of my invention is to provide a chair in which the back therefor is pivotally mounted to the frame at its sides, intermediate its ends, and in which the seat is supported at its rear corners by members depending from the sides of the pivoted back.

Another object is to provide a chair embodying a frame for supporting an articulated seat and back, the seat being supported at its front edge on the frame and the back being pivotally connected to the frame, whereby when a person sits on the seat the back rocks about its pivot points, thereby providing a chair which is extremely comfortable and which is self-adjusting to fit the posture of the user.

Another object is to provide a chair of the character designated in which the seat and back are constructed and arranged so as to be somewhat inherently flexible, adding to the comfort of the chair, and affording means for securing in effect a pivoted connection between the seat and back at the rear of the seat, which together with the pivotal connection between the back and frame results in a self-adjusting, form fitting chair.

A further object is to provide a chair of the character designated in which the back of the chair embodies side members pivotally mounted to the chair frame, and in which the back proper is carried in an auxiliary frame pivoted to theside members, whereby the back as a whole is pivotally connected to the rear of the chair frame and at the same time the back proper is free to move about its pivot points relative to the side members, thus to accommodate itself to the back of a person using the chair.

A further object is to provide the back of the chair just described with springs for biasing the back toward centered position relative to its frame, and to provide means for limiting the pivotal movement of the auxiliary frame relative to the back supporting frame.

A still further object is to provide a chair of the character designated in which the seat and back, or either of them, are formed of sheet metal strips bent under at each end, and in which the seat and back are supported from such bent ends, providing in effect a spring supported seat or back. i

Chairs embodying the features of my invention are illustrated in the accompanying drawings forming a part of this application in which:

Fig. 1 is a side elevational view of one modification;

Fig. 2 is a front elevational view of the chair shown in Fig. 1;

Fig. 3 is a rear elevational view of the same;

Fig. 4 is a fragmental enlarged side View of the back and rear portion of the seat and illustrating the action of the seat and back when a person sits in the chair;

Fig. 5 is a fragmental detail view illustrating the method of joining one of the connecting members depending from the back to a rear corner of the seat;

Fig. 6 is a detail sectional view taken generally along line VI-VI of Fig. 4;

Fig. '7 is a view corresponding substantially to Fig. 4 and showing a modified form of my invention;

Fig. 8 is a detail sectional view taken generally along line VIII-VIII of Fig. 7;

Fig. 9 is a fragmental, sectional, isometric view looking at the inside of one of the links connecting the back to a corner of the seat;

Fig. 10 is a detail sectional view taken generally along line XX of Fig. 8 and drawn to an enlarged scale; and

Fig. 11 is a side elevational view of a chair similar to the one shown in Figs. 7 to 9 inclusive, and embodying a slightly modified form of seat and back.

Referring now more particularly to Figs. 1 to 6 inclusive of the drawings, my improved chair embodies generally a supporting frame A, a seat B, and a back 0. The frame A preferably is formed of metallic tubing bent to the shape shown and to be described, while the seat B and back C preferably are formed of strips of spring steel, cross braced and supported as will be de-- scribed.

The frame A preferably comprises a pair of side frames Iii and II, each of which embodies a floor engaging member l2 and an upper rearwardly extending member is constructed and arranged to provide arms for the chair. The members [2 and [3 are joined by a section of the tubing extending upwardly as at M. Each of the members I2 at their rear ends are bent inwardly to provide transverse sections [6 and I! of the tubing. These sections are joined in abutting relation by means of a sleeve l8 and screws [9 and nuts 2| therefor. The sleeve 18 preferably is cut away on its under side indicated at 22, whereby the members [6 and I1 engage evenly with the floor on which the chair rests. The object of the divided frame is to facilitate packing and storing the chairs in knock down condition.

Joining the members l4 of the side portions Ill and l I of the frame is an angle 23. The angle is disposed below the level of the arms I3, and is secured to the members [4 by means of screws 24 and nuts 26 therefor.

The seat B comprises a plurality of strips of sheet spring steel 21 which extend from front to rear of the chair. The strips are cross connected by means of straps 28, secured thereto by means of fiat head rivets 29. At their forward ends each of the strips forming the seat is bent under as at 3|, to provide a U-shaped front edge for the seat, and the free ends 32 of the underbent legs are secured to the angle 23 by means of rivets 33. The rear edge of the seat is formed by bending under the strips as indicated at 34, the free legs 36 extending forwardly as indicated. Cross connecting the free legs 36 of the strips at the rear is a second angle 31, secured to the strips by means of rivets 38.

The back for the chair comprises a plurality of vertically disposed strips of spring steel, similar to the strips 21, and held in spaced relation by means of cross straps 4| and rivets 42. The upper and lower ends may be bent over rearwardly of the back as indicated at 43 and 44. The strips may be folded flat upon a relatively thin bar 46, and the bent ends of each strip may be secured thereto by stitching in the manner understood in the art. At the sides of the back are angled members 41 and 48 having flanges 49 and turned at right angles to the surface of the back to lie immediately at the sides thereof. The angles 41 and 48 may be secured to the remainder of the back structure by means of projecting ends 52 and 53 riveted to the upper and lower cross straps 4 I.

Pivotally mounted by'means of screws 54 and nuts 56 to the rear end of the arms [3 are a pair of links 51 and 58. The ends 59 and BI depend below the pivot points formed by the screws 54. On the lower end of each of the sections 59 and BI is an inturned lug 62. The lugs 52 are secured to the rear cross angle 31 by means of screws 63 and nuts 54 therefor. The upper ends of the links 51 and 58 extend past the pivot points provided by the screws 54, and are secured t'o'the side angles 49 and 5| by means of screws 66 and nuts 61 therefor.

As best shown in the side elevational views, Figs. 1 and. 4, the seat B preferably is bowed upwardly whereby the same elongates from front to rear when a person sits therein. The links 51 and 58, being connected to the rear corners of the seat structure, are thus moved slightly to the rear when a person sits in the seat as shown in the dotted line position, Fig. 4. Rearward elongation of the seat therefore causes the back C to pivot about the screws 54, thus accommodating the back to the back of the person using the chair. The seat and back are thus articulated with respect to each other, and the seat is resiliently supported from the U-shaped bent ends of the strips and at its front and rear edges by the cross member 23 and the lugs 62 carried by the links 51 and 53. The seat is effectively tied to the lugs 62 across its entire rear edge through the angle 31, and the rear of the seat is in effect pivotally connected to the lower end of members 51 and 58, since the inherent resiliency of the metal of which the seat is formed permits a certain amount of flexing at the U- shaped bends 34.

a pair of link members 58, substantially similar to the links 51 and 58, except that the lower ends 69 thereof preferably are directed forwardly of the chair at a greater angle than the lower ends of the links 51 and 58. These links are pivotally connected tothe arms l3 by means of bolts 1| and nuts 12 therefore, substantially in the manner by which the members 51 and 58 are connected to'the arms by the bolts 54. The lower ends 59 of the links 58 are turned in as at 13, and are secured to the cross angle 31 by means of the screws (53 and nuts 64. The seat B is identical with the one previously described, the under turned legs 36 of the U-shaped bends 34 being secured'to the angle by the rivets in the manner already mentioned.

As best shown in Fig. 9 of the drawings, I pivotally mount on the'bolts 1| vertically disposed auxiliary frame members 14. The upper and lower ends each of the frame members 14 are widened as indicated at 16, and have an 1 inwardly directed lug 11 bent from the rear end of the widened section. Each elongated portion 16 has therein a closed ended slot 18, preferably struck on a radius from the center of the pivot point provided by the bolt H. Secured to the links and slidably disposed in slots 18 are rivets or pins 19. Secured to the upper and lowerpairs of lugs 11 by rivets are the ends of bars 8| to which in turn are secured the rearward free'l'egs 82 of the upper and lower U-shaped ends of the back structure 0. The back proper is'preferably formed of steel strips in the manner already explained, and these strips are secured together by cross bars 83 and rivets 84.

Secured to the forward edges of the links 68 as by screws 86 are a'pair'of flat springs 81 having their free ends oppositely directed, to lie above and below the pivot points formed by the bolts 1|. On the free ends of the springsfl'l are widened portions 88 adapted to overlie the frame members 14.

It will be apparent that the back structure C is supported by its auxiliary frame members 14 for relative pivotal movement with respect to the links 68, and that the springs 81 tend to bias the same toward acentral pivoted position relative to the links. The pins 19 in the notches 18 serve to guide the back in its pivotal movement, and to limit the extent of this pivotal movement. Thus, when a person sits in a chair of the char acter just described, the seat 13, being upwardly bowed as already explained elongates'slightly-to the rear, pivotingthe links'68 about the bolts 1|. Upon leaning back in the chair, the persons back contactsthe back structure C','and the same rocks to adjust itself to the posture of the person by pivoting about the bolts 1|, independently of the links 68. This pivotal movement is limited by the upper and lower arcuate slots 18 in the elongated portions 16. The back C preferably is outwardly bowed, adding further to the comfort of the chair. The springs 81 bias the auxiliary back supporting frame to a position preferably with the pins 19 midway between the ends of the slots 18.

Referring now to Fig. 11 of the drawingaI'show a chair which embodies the construction just described in connection with the second modification, and which additionally embodies a different type of seat and back. In this case, the seat B embodies the strips of flexible steel material,

cross braced by straps 89 and rivets 9 l. The forward edge of the seat is formed by bending over and under each of the strips of material, as at 92, thereby providing a substantially horizontal section 93, which in turn is bent under and forwardly as at 94. The horizontal free end of each strip is secured by rivets 95 to the cross angle 23 at the front of the chair. Similarly, the rear of the seat is provided with downwardly bent U-shaped sections 96, which are bent again rearwardly as at 91, and the free ends thereof are secured to the cross angle 31 by rivets 98. The front and rear edges of the seat are thus S-shaped, and the free ends of the strips are supported on the angles 23 and 31.

The back structure 0" is formed of strips of steel, suitably cross braced as already mentioned, and provided on the upper and lower ends with U -shaped bends 99 and I0 I. These bent portions are again bent upwardly at the upper end of the back and downwardly at the lower end of the back as indicated at H12 and I03, respectively, forming S-shaped upper and lower ends for the seat. The free ends of the strips are secured to the cross bars 8| by rivets I04.

It will be seen that the upwardly bowed seat and outwardly bowed back of the last described modification results in a seat and back which are more resiliently supported adjacent their ends or edges than in the previous modifications,

thus adding further to the comfort of the chair. In combination with the pivotally supported links, and independently supported back frame, the latter type chair is extremely flexible and comfortable, and is self-adjusting to the posture of the user.

From the foregoing it will be apparent that I have devised an improved chair which is simple of construction and manufacture and which is both fiexible and self-adjusting to the posture of the user. With either modification of my invention I provide a secure and yet flexible tie between the rear of the seat and back. Chairs made in accordance with my invention are characterized by the absence of complicated structural parts, and hence may be produced economically and lend themselves readily to mass production.

While I have shown my invention as embodied in a chair having a floor engaging supporting frame, it will be apparent that the same may be swingably supported in a suitable frame, thereby to form a glider chair. Thus the expression "supporting frame is intended to cover such an arrangement. Likewise, my invention is equally applicable to elongated chairs or seats such as glider swings and the like.

While I have shown my invention in several forms, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are specifically set forth in the appended claims.

What I claim is:

1. In a chair, a supporting frame embodying a front cross member and a pair of rearwardly extending members raised above the level of the front cross member, an upwardly bowed seat formed of strips of spring steel supported adjacent its front edge from the front cross member, a rear cross member secured to the rear edge of the seat, a back embodying side members disposed between the rearwardly extending members, and links pivotally connecting the side members intermediate the ends thereof to the adjacent rearwardly extending members, said links being secured at their upper ends to the sides of the back and at their lower ends to the rear cross member.

2. A chair as defined in claim 1 in which the seat is formed of strips of spring steel having U-shaped bends at the front and rear edges, and in which the free ends of the U-shaped bends at the front and rear are secured to the front and rear cross members respectively.

3. In a chair embodying a tubular supporting frame comprising a pair of U shaped sides having vertically disposed front members and upper and lower pairs of horizontally disposed rearwardly extending members, said lower members being floor engaging members and the uppermost ones being constructed and arranged to form arms for the chair, the combination of front and rear cross members connecting the front vertical members and lower horizontal members respectively, a spring steel seat having underturned U-shaped bends along its front and rear edges with the legs of the U-shaped bends directed toward each other, means securing the legs of the U-shaped bends along the front edges thereof to the front cross member, a cross member secured to the legs of the U-shaped bends at the rear edges of the seat, a pair of links connected at their lower ends to said last mentioned cross member and pivotally connected to the rearmost ends of the arms, and a back structure disposed between the arms and secured at its sides to said links.

4. In a chair, a supporting frame embodying a cross member at the front and a pair of rearwardly extending arms, a seat supported at the front edge thereof from said cross member, a pair of links pivotally connected to the arms and with their lower ends secured to the rear of the seat, a back frame pivoted intermediate its upper and lower ends to the links, a back in said frame, mechanism limiting the relative pivotal movement between the back frame and links, and springs constructed and arranged to bias said back frame toward an intermediate pivoted position relative to the links.

5. A chair as defined in claim 3 in which the back structure comprises a plurality of vertically disposed spaced steel strips secured together by cross members, and flanges at the sides of said back to which the links are connected.

6. A chair as defined in claim 4 in which the means to limit the relative pivotal movement between the back frame and links comprises closed ended slots in the back frame on either side of the pivot point thereof, and members carried by the links and projecting into said slots.

7. In a chair, a supporting frame having a front cross member and rearwardly extending arms raised above the level of the cross member, a resilient seat formed of strips of sheet metal extending from front to rear of the chair and bowed upwardly, under bent portions on the front and rear ends of said strips forming U-shaped front and rear edges for the seat, means to secure the legs of the U-shaped front edge of the seat to the front cross member, a rear cross member secured to the legs of the U-shaped rear edge of the seat, a pair of vertically disposed links pivotally connected to the arms, means connecting the lower ends of the'links to the rear cross member, a back frame embodying side membersdisposed between the upper ends of the links and mounted for-pivotal movement relative to the links about the same points as the links are connected to the arms, a back embodying resilient strips of metal having U-shaped upper and lower ends, and means securing the free ends of the U-shaped upper and lower ends of the back to the upper and lower ends of the back frame.

8. In a chair, a supporting frame embodying a front cross member and a pair of arms, a seat formed of strips of-spring steel bent to provide S-shaped front and rear edges for the seat, means securing the free ends of the S-shaped front of the seat to thefront crossmember, a rear cross member secured to the free ends of the S-shaped rear of the seat, apair of vertically disposed links positioned between the arms and pivoted at each 'side to the adjacent arm, a back formed of strips of spring steel bent to provide S-shaped upper and lower ends for the back,a back frame embodying side members mounted for pivotal movement relative to the links about the pivot points on which the links are mounted, means securing the free ends of the upper and lower ends of the back to the back frame, and means connecting the rear cross member to the lower ends of said links.

LUTHERA. SMITH.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 190,967 Hess May22, 1877 1,879,724 Wolpert Sept.27, 1932 2,125,920 Hayden Aug. 9, 1938 2,485,387 Krakora Oct. .18, 1949

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