US1716518A - Spring structure for seat cushions - Google Patents

Description

June 11, 1 929. v A, EGGL. 1.716.518 I SPRING S'I RUCTURE FOR S EA'If CUS HIONS Filed D60. 26, 1924 Patented June 11, 1929.

UNITED STATES Pa'rrirrr LOFFICE.

ADOLF EGG-LI, OF COLOGNE, GERMANY, ASSIGNOR TO E. W. SGHLAPPRIT ZI, OF MINNE- APOLIS, MINNESOTA.

SPRING STRUCTURE FOR SEAT CUSHIONS.

This invention relates to spring structures for seat cushions and relates particularly to cushion structures employing leaf springs.

The invention consists in the structural features and arrangement of parts hereinafter fully described.

In the drawings Figure 1 is a plan view-of the improved spring structure;

Figure'2 is a side view of the same;

Figure 3 is an end view;

Figure 4 is an enlarged view of a clip connecting two transverse tie members;

Figure 5 is a detail section on line 5.-5 of Figure 4.

In these views the reference character A designates a bottom border frame comprised -braces A form a further reinforcement.

Preferably the rear bar A extends substantially the full length of the spring structure and is secured by clips A to the ends of the border frame A. The end portions-of the bottom frame are respectively reinforced by braces A parallel to the braces A and extending from the rear bar A to'the front member of thebottom frame,-being secured to the latter by clips A The braces A are connected also to the ends of the frame A by short links A The top frame comprises simply a border member B formed preferably of a resilient metal rod similar to that used in the bottom frame and corresponding in contour to the latter. The member B,- however, preferably employs no rear connecting portion between its ends, this beingbest seen in Figure 1. For resiliently mounting the top frame upon the lower one there is employed a plurality of leaf springs C, each of an approximate semi-circular shape, said springs being arranged, preferably in opposed pairs, riveted or otherwise secured to the bars A of the bottom frame, the ends of the opposed springs being convergent. The upper ends of each pair of opposed springs are connected A by a pair of tie members D formed of spring metal, the same being preferably riveted to the springs C. Said tie members are extended forwardly beyond their points of connection with the front row of springs O, as indicated at D, said portions D being terminally secured by clips D to the front portion of the top frame. B. Thus the extensions of said tie members constitute a primary means for supporting the top frame upon the springs. A secondary means for that purpose is formed by a pair of links E which extend from the end ties D to the end portions of the top frame.

The end pairs of leaf springs C are opposed in a more closely adjacent relation than the intervening springs owing to the reduction of space resulting from the rounded corners of the frames A and B. F is a reinforcing strap formed of spring metal and connecting the tie members D substantially along the longitudinal center line of the top frame. Said strap, as shown, is riveted at F to one tie member of each pair and is connected to the other tie member'by a sheet metal clip I providing for a slight sliding movement between said strap and the ties. Each ofthe leaf springs C is provided with a reinforcement which takes effect under predetermined conditions of severe stress. Thus an arcuate leaf spring G is interiorly secured to each spring at substantially a mid height, preferably by a rivet G. The curvature of the re inforcing springs G is of lesser radius than that of the main springs so that the latter come into reinforcing engagement with the former only under conditions of considerable distortion, as shown in Figure 5.

Considering the structure now more fully with respect to the functions of its various parts it will be readily understood that the top border fr'ame B coacts with the tie members D to support the top upholstery (not shown) of a cushion. Under load the tie members D and likewise the longitudinal reinforcing strapF will yield downwardly, stressing the leaf springs C. If the weight resting upon the structure is unusually severe the springs the structure is under stress,

ward each main springs C will engage the auxiliary G and be reinforced thereby. The clip connections D between the tie members D and the top frame B are free to turn upon said frame when the tie members are depressed under load.

The resilient nature of the rod B forming the top frame permits the end portions thereof to function as springs tending to maintain the longitudinal strap member F normally taut and in the planeof said frame. When however, all or any portion of said strap member may be downwardly deflected, this being permitted by a yielding of the ends of the top frame toother. When the structure is relieved of load the end portions of the top spring will return to their maximum spaced relation, straightening said strap.

The sliding connections between the strap F and the tie members D secured where the links E are employed to establish such connections, permit such limited relative transverse movement of said strap and ties as may be required by conditions of stress,

It is to be observed that both the top and bottom frames have a greater extent from front to back and alsofrom end to end than the springs C which is to be so that'the fabric coverin mounted upon the describe structure will be engaged solely with said top and bottom frame andnot sub]ected to wear and'deterioration by contact with the springs.

. adapted for What I claim as my invention is 1. A top frame for a spring cushion structure comprising a rod extending along the front and ends of said structure having all portions spaced from the lower frame of said structure, said frame being open at its rear, the rear extre ties of the ends of Said frame being curved toward each other.

2. A spring structure for cushion seats comrising top and bottom frames, the former liaving resilient end portions inte ral with the frontportion, springs interme iate said frames, and a connection between said end portions normally maintained thereby substantially in the plane of the top frame and deflection under load through stressing of said end portions toward each other. 1

3. A -spring structure for cushion seats comprising top and bottom frames, the forthrough stressing of said end portions toward each other.

4. A spring structure for seat cushions comprising top and bottom frames, the former having resilient end portions integral with the front portion, leaf sprlngs arranged 1n opposed pairs and mounting the top frame on the bottom frame, a series of substantially comprising a bottom frame, and a top frame formed by a rod comprising front and end portions only, said end porti ns being resilient and free at their rear extremities, springs mounting saidtop frame on the bottom frame and a tie connection between the end portions of the top frame adapted for downward deflection under stress through springing of said portions toward each other and normally held substantially in the plane of the top frame by said portions.

6. A spring structure for seat cushions comprising top and bottom frames, one of which has resilient end portions integral with 1 the front ortion thereof, springs intermedi ate said rames, and a connection between said end portions normally maintained thereby substantially in the plane thereof.

7. isprmg structure for' cushion seats comprislng a bottom frame having a continuous red as its peripheral portion, and a top frame formed byarod comprising front and end portions only, said endportions being resilient and free at their rear extremities,

springs mounting said top frame on the bot-- tom frame, and a tie connection between the end portions of the topframe adapted for-a downward deflection under stress through springing of said portions toward each other I and normally held substantially in the plane of the top frame by said portions.

8.. A spring structure. for cushion seats I.

comprising a pair of s aced frames, each of.

said frames having an integral rod as its peripheral member, the peripheral member of the lower frame-providing a complete enclosure, the periphera member of the upper frame conforming substantially to the contour of the lower frame, but having no rear portion, the end portions of said upper peripheral member being resilient, springs mou nting' said top frame on the bottom frame, and a tie connection between the end portions of the top frame adapted for down ward deflection under stress through spring-' ing of said portions toward each other and normally h d substantially in the plane of the top frame by said portions.

9. A spring structu're'for cushion seats comprising top and bottom frames, the former. having resilient end portions integral with the front sections, leaf springs arranged and transverse members extended between in opposed pairs and mounting the top frame and connected at their opposite ends to said on the bottom frame, tie members connecting outer tie members and said resilient end mem- 10 the paired leaf spring at the top thereof and hers. 5 extended to engage and support the top In testimony whereof I afiix my signature.

frame, a transversely extending member con- 4 nected at its ends to the outer tie members, ADOLF EGGLI.

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