US2617123A - Spring construction - Google Patents

Description

Nov. 11, 1952 L. T. MAYER SPRING CONSTRUCTION Filed Dec. 28, 1945 7 my M N 7 I Patented Nov. 11, 1952 v UNITED STATES SPRING CONSTRUCTION Louis T. Mayer, Detroit, Mich., assign'or'to No-Sag Spring Company, Warren Township, corporation of Michigan Mich., a

Application December 28, 1945, Serial No. 637,568

v 1 p T This invention relatesto coil springs, and particularly to a coil spring having on both end coils preformed portions which permit one spring to be secured to another to form assembled units.

Heretofore it has been the practice in the art to join the top and bottom coils of springs by employing a "pigtaiP or length of helical coiled wire 'of small diameter which was spun between the abutted edges of rows of the springs. The springs were assembled in fixtures in rows, with the adjacent and coils held in abutting relation to each other. Spinning means were provided for rotating the pigtail on its axis and advancing it through the fixture and about the abutted coils for securing the springs together in assembled relation. In practicing the present invention, the coil springs are constructed to have the endcoils formed with interconnectable projecting portions which permitted the springs to be directly assembled one with the other. This eliminates the fixture employed heretofore for assembling the springs and holding the end coils thereof in predetermined position, as well as the spinning mechanism and the pigtail which was advanced thereby for joining the end coils together.

The springs may be of the conical, cylindrical, or hourglass type, having one or both of the end coils provided with preformed projecting hook andeye portions disposed 90 apart. The ends of the wire after being knotted to complete the end coils are projected outwardly and reversely bent to form hooks. Diametrically opposite to the hook, an eye is formed in the end coils for receiving a hook of an adjacent spring. 90 from the hook and eye provided in this manier in the end coils, an additional hook and eye is formed therein diametrically opposite to each other from thewire from which the end coils are formed. The eye is placed On one side of the diameter through the first mentioned hook and eye, as on the left side, while on the opposite, or right side, the hook is formed which is projectable into an eye. The hook preferably is provided with a head having a reduced neck so that the head will form a look when disposed through an elongated opening through the eye. The enlarged head is inserted through the elongated portion of the eye in one position of a pair of springs and when the springs are moved to have their diameter aligned with the diameter of a row of adjacent springs, the head is disposed crosswise to the elongated opening in the eye and is thereby permanently locked in place with the end coils in hinged relation to each other.

2 Claims. (Cl. 5248) Accordingly, the main objects of'the invention are: to form interconnectinghooks and eyes on the end coil of a spring by which they'are assembled on four sides to adjacent springs; to ex-- tend the wire from the knot of the end coil-outwardly and reversely bend the wire end to'fo'rm a'hook which is engageable with an eye in the coil of an adjacent spring which is disposed di-' ametrically opposite to the hook thereon; to form a-hook and eye on two diameters of the end coils of a spring disposed 90 from each other engageable with like hooks and eyes on the ends of like springs to form a spring assembly; to form an eyewith'an elongated opening and the hook with an enlarged head and reduced neck portion which is insertable through the opening of the eye'in one position of the springs and which locks the springs together when the springs are moved into assembled relation to each other; and, in general, to provide springs with interengaging"projections which simplify the assembly and positively n'iaintain the springs in assembled movable relation to each other.

Other objects and features of novelty of the invention will be specifically pointed out or will become apparent when referring, for a better understanding of the invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Figure 1 is a plan view of a section of a spring assembly made up from a plurality of springs embodying the present invention;

Fig. 2 is a view in elevation of the structure i1- lustrated in Fig. 1 the border wire being omitted;

Fig. 3 is. an enlarged broken perspective view of the assembly illustrated in Fig. 1, as viewed from point 3 thereof; and

Fig. 4 is an enlarged broken perspective view of the structure illustrated in Fig. 1, as viewed from point 4 thereof The springs l of the present invention are of the hour-glass type having a top coil 2 and a bottom coil 3 of the same diameter, with a plurality of helically disposed coils 4 therebetween of varying diameter. The spring is wound by a machine from wire which passes therethrough and forms a knot 5 on each of the coils 2 and 3. The wire of the knots is extended outwardly upon the radius of the coil at 6 and is reversely bent to form a downwardly presenting loop 1 having an arcuate end 8 to form an open-ended hook 9. Diametrically opposite to the knots 5, an eye I0 is formed in the wire of the top coil 2 and bottom coil 3. The eye is so formed as to receive a like book 9 in an adjacent spring,

as illustrated in the figures. 90 from the hook 9 and eye it, an eye II and hook I! are formed in the wire of the top and bottom coils 2 and 3 in diametrically opposite relation to each other. The eye I I is slightly elongated on the radius of the coil and the hook I2 is provided with an enlarged head H which is insertable in the elongated opening in the eye H when the head is disposed substantially on the radius through the eye. When the coil is swung around into assembled position, as illustrated in Fig. 1, the head is disposed transversely of the elongated opening through the eye so as to be locked therein, as more clearly illustrated in Fig. 3.

The springs are first assembled in rows l4 and I5 and the springs of each row are then hooked together through the engagement of the hook 9 with the adjacent eye It). The reverse curve portion 9 on the reversely bent portion of the wire 6 permits the end to pass over the diameter oi the wire forming the eye I0 and to restrict the separation thereof.

A border wire [6 may be provided for the springs having a plurality of eyes ll spaced a predetermined distance apart in which the hooks S and i2 may be disposed to secure the border wire about the spring assembly. It is to be understood that the end springs may have the hooks 9 and I2 omitted from the outside portion of the coils and have a border wire clipped or secured thereto in the conventional manner. When the coil assemblies are made in large production, it is found that the. preformed border wire [6 can be efiicientlyemployed so as to provide a complete spring assembly without requiring the use of clips as heretofore employed in the art for connecting a border wire to the springs.

What is claimed is:

1. A coil spring assembly embodying a plurality of coil springs each having a top coil provided with a hook and eye diametrically disposed and positioned 90 from a second diametrically disposed hook and eye, the hook on one coil being assembled into an eye on the other coil to form a hinged connection therebetween, said hooks being formed in a manner to provide a releasable locking engagement with an eye in one position of the spring with an adjacent spring and to be nonreleasable when in position of assembly with said other spring, and a border wire haying a plurality of spaced eyes disposed therein which are secured to the hooks of the outer springs of the assembly for supporting the border wire thereto.

'2. A coil spring made of wire having a plurality of coils with the top coil securely knotted to the next adjacent coil by a turn of the wire.

drawn tightly thereabout and extended and formed into a hook, three pairs of offset portions formed from the top coil each having a pair of parallel radial sections integrally joined at their outer ends by an enlarged head portion, two said pairs of offset portions being equally spaced from said hook, the third pair being diametrically disposed thereto, the head on one pair of parallel portions located 90 from said hook being formed downwardly to also form a hook.

LOUIS T. MAYER.

REFERENCES CITED The following references are of record in the

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