US2488468A - Solenoid construction - Google Patents

Description

Nov. 15, 1949 N. DINION 2,483,438

SOLENOID CONSTRUCTION Filed Oct. 25, 1947 Patented Nov. 15, 1949 UNITED STATES PAT ENT OFFICE SOLENOID CONSTRUCTION Nathan Dini'on, Caledonia, N. Y.

Application October 25, 1947:, Serial No. 782,109.

1 Claim. 1

The invention herein disclosed relates to the manufacture and structure of solenoids.

Objects of the invention are "to providean inexpensive form of solenoid which will be entirely practical and efiicient, which will require the fewest possible number of parts, take up but small space and be light in weight.

Other special objects of the invention are to enable quick, simple and easy assemblage of the parts and provide for adjustments such as may be desired, as for example the relative positioning of the terminals of the solenoid windings.

Other important objects attained by the invention are set forth or will appear in the course of the following specification.

The drawing accompanying and forming part of the specification illustrates a present commercial embodiment of the invention. Structure, however, may be modified to some extent as regards the immediate illustration, all within the true intent and scope of the invention as hereinafter defined and claimed.

Fig. 1 in the drawing is a combined sectional and perspective view illustrating the parts of the solenoid, except for the winding;

Fig. 2 is a longitudinal sectional view showing the parts of Fig. 1 assembled ready to receive the winding;

Fig. 3 is a generally similar view with the winding in place and shown in section between the end. abutments;

Fig. 4 is an elevation of the completed structure.

In Fig. 1 the parts to form the foundation of the coil are shown as consisting of a length of paper tube 1, four insulating washers 8, 9, l0, ll, of a size to closely fit over the tube, and two thin, flat metallic washers I2, l3, also of a size to closely fit over the tube and having radially extending terminal lugs l4, IS.

The metallic terminal washers l2, l3, while usually by preference of the same internal diameter as the insulating washers, may be of less external diameter, substantially as shown in Figs. 1 and 2, so as to be guarded and to some extent protected by the insulating washers, which in the completed coil stand at opposite sides of the terminal washers.

Fig. 2 shows how the foundation parts are assembled by slipping the washers over the tube, with one insulating washer located at the inside of a terminal washer and another insulating washer at the outside of the same and with the two groups of three washers located near the ends of the tube.

After the two sets of three washers are engaged over the tube, the ends of the tube are spun over or flanged, as indicated at E6, to secure the washers insuch relation on the tube. Thisspinning or flanging operation may be effected by spinning rolls brought together over the ends of the tube, sufficient pressure being employed to give the flanges a permanent set.

After flangin the ends of the tube the solenoid wire is wound over the tube between the inner insulating washers 9 and In, this winding, as indicated at I! in Fig. 3, exerting a spreading force tending to set the washer assemblies firmly up against the end flanges I6.

When the winding is completed a wrapper of insulating material may be applied as a cover over the wire, as indicated at l8, this cover serving both as a protection for the wire and as a permanent spacer for the innermost insulating washers 9 and H].

The securing of the parts in the manner described leaves the terminal lugs l4, l5, freely projecting and free to be rotated on the tube to carry them into any position desired for them to occupy in the finished product.

In Fig. 4 the terminal washers l2, l3, have been relatively rotated to bring the wiring lugs l4, l5, into slightly offset relation and the ends of the solenoid winding secured thereto at IS, with the lugs bent inward to take up less space.

If desired, for mounting or other purposes, the terminal lugs may be left in an outstanding position or be bent in various ways, according to special requirements.

In this invention solenoids can be inexpensively produced, under relatively simple assembling and manufacturing operations. No machining operations are required. No extra parts are used, the solenoid consisting practically only of the bare essentials. This keeps the coil down to a minimum weight and to a minimum size, making it usable in places where small size and low weight are requisite. With the absence of additional or accessory metal parts, such as terminal plates, rivets, heavy insulation and the like, a maximum of electrical and magnetic efficiency is obtainable.

The insulating tube may be a commercial form of helically wrapped paper tubing. This has the necessary insulating qualities and mechanical strength and is capable of being expanded and flanged at the ends to hold the coil supporting parts in place. The tube, however, may be of other than paper or insulatin material.

In some instances, when so desired, both terminals may be located at one end, separated by an insulating washer or washers. The outer insulating washers 8 and l l in some instances may be omitted, the spun over ends 16 of the tubes then directly engaging the terminal washers to hold them in place. Further, in some instances, inner insulating washers may be omitted. Also, it is possible that both terminal washers may be located at the same end, separated by one or more insulating washers. In such case a single metal or insulating washer may be used at the other end, held by the tube flange at that end.

What is claimed is:

A solenoid comprising a tube of insulating material, metal terminal washers loosely engaged on said tube near opposite ends of the same, said metal washers having integral, radially projecting terminal lugs, insulating washers engaged on said tube at the opposite sides of each of said metal terminal washers and of larger diameter than said metal washers, integral flanges on the ends of said insulating tube engaging the endmost insulating washers and confining all of said washers thereon, a solenoid winding engaged on said insulating tube between the insulatin washers at the inner sides of the metal washers, said winding connected at its opposite ends with said radially projecting lugs of the metal terminal washers, and an insulating cover over said winding, said lugs being turned inward to confine the cover and winding.

NATHAN DINION.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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