US1394005A - Spring for chair-backs and the like - Google Patents

Description

E. E. GRAFF AND C. M. FISHER. SPRING FOR cum BACKS AND THE LIKE APPLICATION FILED MAR. 3, 1920.

Patented Oct. 18, 1921.

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attoMw/go UNITED STATES PATENT OFFICE.

EDWIN E. GRAFF AND CHARLES M. FISHER, OF SOUTH BEND, INDIANA.

SPRING FOR CHAIR-BACKS AND THE LIKE.

Specification of Letters Iatent.

Patented Oct. 18, 1921.

Application filed March 3, 1920; Serial No. 363,037.

T all whom it may concern. 7

Be it known that we, EDWIN E. GRAFF and CHARLES M. FIST-Inn, citizens of the United States, residing at South Bend, in

the county of St. Joseph, Stateof Indiana, have invented a new and useful Spring for Chair-Backs and the like, of which the following is a specification.

This invention relates to a spring structure for use in the backs of automobile chairs and the like, one of the objects being to make adevice of this character out of spring wire interwoven in a novel manner and arranged in connected widths, whereby the said structure will give under the pressure of the back of the user and provide a comfortable, efficient and inexpensive rest which will adapt itself to the contours of the body, and materially reduce the amount of hair required in the manufacture of the back of the seat.

A further object is to provide a structure of this type which will avoid friction by moving up and down with the back, when jolted, and will press outward to resist pres-. sure.

lVith the foregoing and other objects in view, which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts which will be hereinafter more fully described and pointed out in the claims, it being understood that various changes may be made in the construction and arrangement of the parts without departing from the spirit or sacrificing any of the advantages of the invention as set forth in the appended claims.

In the accompanying drawings- Figure 1 is a rear elevation of a portion of a chair back having the present improvements.

Fig. 2 is a vertical section through the back.

Fig. 3 is a section on line 33, Fig. 2.

Fig. 4: is an enlarged detail View of a portion of the spring.

Referring to the figures by characters of reference 1 designates a strand of hea spring wire which is combined with another similar strand 2 to form one of the units of the spring. Each unit is made by twisting the two strands together at regular intervals, as shown at 3 thus to form diamond shaped openings, each strand being provided, at the sides of said openings, with coils or eyes at. Each strand extends from one of the twisted portions 3 to one of the eyes 4, thence through the next twisted portion 3 and then across the spring to the eye 4: at the opposite side thereof. The Strand is then brought back in the same manner to the other side of the spring. The eyes along the two sides of the spring units are engaged by hooks 5 formed by bending alternate angle portions of a Zigzag wire 6, this wire being formed of a spring metal. The said wire 6, which constitutes attaching means, are located along both sides of each spring unit.

An automobile chair back or the like embodying the present improvementprovided with a back frame 7 of suitable rigid material, preferably of strips of metal and extending from this frame are teeth or projections 8. The spring units are adapted to be placed side by side upon the back of a pad 9 which can be upholstered in any manner desired, the wire 6 being attached to the back surface of this pad by means of threads 10 or the like and the said wire 6 interfitting as shown particularly in Fig. 1. After the parts have thus been assembled the spring units are bulged forwardly and the ends thereof placed in engagement with the teeth or prongs 8, thus holding the pad 9 pressed outwardly along curved lines as indicated particularly in Fig. 2. These spring units are of suflicient strength to properly supportthe back of the user and will, at the same time, yield in any direction to conform to the contours of the back, thereby providing a comfortable rest. By

7 bulging the spring forwardly as shown the back sufliciently stiifens and at the same time is free to move up and downwardly with the body should the seat be jolted. The spring units are not connected to each other but, instead, are secured to the wires 6 which, in turn, are fastened. to the pad, the wires on the two units interfitting as shown in Fig. 1. Thus the desired transverse flexibility of the back is obtained in addition to longitudinal flexibilit What is claimed is:

1. A back cushion for automobile chairs and the like comprising a back structure, parallel spring units having their ends inturned and secured to the upper and lower portions of the back structure, said units being bulged outwardly from the structure, each unit including crossed zigzag wires twisted together at their points of intersection and having eyes at their side angles,

' zigzag attaching wires having hooked portions extending into the eyes, a pad extending over the spring units, and means for connecting the zigzag wires to the back surface of the pad.

2. A spring cushion for seat backs including parallel spring units each consisting of crossed spring wires twisted together at their points of crossing and having eyes at the side extremities or angles of the unit,

spring attaching wires movably engaging] the eyes, a pad secured to the attaching EDWIN EIGRAFF,

CHARLES H; FISHER.

lVitnesses: i

DALLAsA. SHIRE, VINCENT Hunzmsnr.

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