US1857764A - Spring device - Google Patents

Description

May 10, 1.932. c. IJNYGARD 1,857,764

SPRING D'EVICE Filed Jan. 22, 1931 INVENTOR. 67/391493 A/Vme'a A T TORNE Y Patented May 10, 1932 UNITED STATES PATENT OFFICE CHARLES I. NYGARD, 0F ELMHURST, NEW YORK SPRING DEVICE Application filed January 22, 1931. Serial No. 510,419.

coils of whichinclude opposlte side faces which are arc-shaped and concaved in-cross sectional form; a still further object being to provide a spring of the class specified which by virtue of its construction, will pro duce greater strength as well as greater'resiliency, notwithstanding the. fact that less 1 material by weight is employed in the structure of the spring; a further object beingto, provide a spring which by virtue of its cross sectional form will permit the use of a greater number of coils within the smallest possible space especially in the construction of conical springs; 11' further object consists in the novel method of forming the wire used in coiling the spring as herein described and claimed; and with these and other objects in view, the invention consists in aspring 0f the class and for the purpose specified which is simple in construction, efficient in use, and which is constructed as hereinafter described and claimed.

The invention is fullydisclosed in the followingspecification, of which the accompanying drawings form a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which:

Fig. 1.is a side and sectional view of a combined compression, expansion and torsional spring. .4 Fig. 2 is a view similar to Fig. 1 showing a compression spring.

Fig. 3 is a similar view of an extension spring.

Fig. 4 is an end view of a torsional spring.

Fig. 5 is a view similar to Fig. 4 of a conical spring Fig. 6 is an enlarged, cross sectional view of one form of'strand from which my improved springs are formed; and,

Fig. 7 is a view similar to Fig. 6 showing a modification.

In carrying my invention into effect, ,1 fashion elongated strip material used in the construction'of springs of various kinds andclasses, examples of which are shown in Figs.

1 to 5 inclusive, by drawing, rolling or otherwise forming the strand into a cross sectional contour similar to that shown in Figs. 6 and .7 of the drawings. In both of these fig- 'ures, a strand of substantially I-beam cross sectional form is disclosed.

In Fig. 6 of the drawings, the strand 10 is fashioned to form arc-shaped or slightly rounded side edgesv 11 and 12 which extend into concaved arc-shaped side faces 13 and 14 of the strip through what might be termed rounded beads or ribs 15 and 16 arranged longitudinallv of the strand, thus producing the substantially I-beam cross sectional form. In other Words, the transverse dimensions of the strand at the sections 15-16 is materially greater than the 'transversedimensions be tween the central portions of the arc-shaped surfaces 13-14.

The structure shown in Fig. 7 is substantially identical to that shown in Fig. 5 in general contour, except that the side edges 11a and 12a areflattened and the surfaces 4 15a and 16a are-also flattened, whereas the surfaces 13a and 14a are arc-shaped and concaved similar to the surfaces 13 and 14.- In some cases. the cross sectional form of spring shown in Fig. 7 would be more desirable than that shown in Fig. 6. a It will be understood that either cross sectional form may be used in the. construction of the several springs 'shown in Figs. 1 to 5 inclusive. For illuscross sectional formshown in Fig. 6 as is indicated in the lower left hand corner of Fig. 1. The ends of the spring '17 terminate in oppositely disposed coupling loops 17b and 17 0. -This typeof spring has many uses, such as example, in conjunction with engine starting devices and like apparatus.

In Fig. 2 of the drawings, I have shown at 18, a plain compression spring, the separate windings 18a ofwhich are of the cross sectional form shown in Fig. 6.

In Fig. 3 of the drawings, I have shown a spring 19 of the extension type, the coils 19a of which are of similar cross sectional 1o form,-the ends of the coils terminating in coupling loops 1% and 190 which may be fashioned to suit any particular type'of appitrdzlttus or device to which said ends are conp e In Fig. 4 of the drawings, I have shown at 20 a torsional spring, the coils 20a of which are formed in accordance with my improved cross sectional form. The opposite ends of the spring terminate in angularly disposed 20 arc-shaped armsQOb and 200 for attachment to suitable supports.

In Fig. 5 of the drawings, l have shown at 21 a conical spring, the coils 21a of which are of the cross sectional form shown in Fig.

5 6. It is preferred that the enlarged portion 1516 of one coil or winding be disposed centrally of an adjacent coil so that the en-' larged portion may be nested within the arcshaped recess 13-14 of an adjacent coil, thus permitting a more compact collapsing of the spring as will be apparent. With this type of spring construction, a larger number of coils may be used within a given length to produce greater power and resiliency. In addition to the feature of my impoved spring as referred to in the description of Fig.5, the particular cross sectional form of the separate coils or windings produces the greatest possible strength, and at the same time, effects a saving in the amount of material employed and further increases the resilient ortensional properties of the spring.

While, in the several views, I have shown springs, the coils of which are wound with the wide surfaces of the coils in opposed relation, it will be apparent that springs of the types disclosed may be wound'with the narrow edges'in adjacent relation. This type of spring construction is especially desirable where the clearance space externally of the spring is limited, and by virtue of the structure of the spring employed, the greatest possible strength will be provided.

concave to form curved, arc-shaped recesses extending centrally-and longitudinally of the strip throughout the entire spring formed thereby, and the separate coils of the spring being wound in close proximity to each other to form spaces between the coils of less dimensions than the'thickness of said coils.

2. A coil spring for engine starters, said spring being fashioned from a strip of wire of the same dimensions throughout its length, the wire being of greater width than thickness, the wide side faces of said strip being concave to form curved, arc-shaped recesses extending centrally and longitudinally of the strip throughout the entire spring formed thereby, the separate coils of the spring being wound in close proximity to each other to form spaces between the coils of less dimensions than the thickness of said coils, and the end coils of said spring terminating in curved loops disposed on one side edge of the spring with said loops arranged in the plane of the coils of the spring. In testimony that I claim the foregoing as my invention I have signed my name this 21st day of January 1931.

CHARLES I. N YGARD.

It will be understood that the different

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