US1976771A - Electrical device - Google Patents

Description

Oct. 16, 1934. BUSCHMAN 1,976,771

ELECTRICAL DEVICE Filed March 2; 1951 INVENTOR.

% ATTORNEYS.

Patented Oct. 16, 1934 PATENT OFFICE ELECTRICAL DEVICE Abraham L. Buschman, New York, N. Y.

Application March 2, 1931, Serial No. 519,393

1 Claim.

This invention relates to electrical devices and is particularly directed to wired electrical attachment members such as lamp sockets connected together by conductor cables and to the methods of making the same.

An object of this invention is to provide in a device of the character described, including wire ends soldered or otherwise attached to the terminals of the device, highly improved, simple, easily applied and comparatively inexpensive means for relieving strain on the soldered or other connection, and further to provide a simple, inexpensive method for making and applying said means.

A further object of this invention is to provide strong, compact and durable construction of the character described, which shall be inexpensive to manufacture, and practical and efficient to a high degree.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter described,

and of which the scope of application will be indicated in the following claim.

In the accompanying drawing, in which is shown one of the various possible illustrative embodirnents of this invention,

Fig. 1 is a perspective view of a lamp socket and lamp wired for series circuit, and embodying my invention;

Fig. 2 is a cross-sectional view taken on line 2 of Fig. 1; and

Fig. 3 is an axial, cross-sectional View of the structure shown in Fig. 1.

Referring now in detail to the drawing, 10 designates an electrical attachment member, here shown in the form of an ordinary electric lamp socket of the type used for Christmas tree lighting outfits, and 11 designates a lamp attached to the socket. In making Christmas tree lighting outfits, a number of sockets are usually connected in series circuit by a single conductor cable. For connecting the socket'lO in a series circuit, there is shown a conductor cable 13, comprising wire 13a covered by the usual rubber insulation 14 and fabric coating 15. The end 16 of the wire 13a may be soldered to the central contact 1'7 of the 0 screw shell 18 fixed within the socket 10. An-

other conductor cable 19 likewise comprising wire 19a covered by a rubber insulating sleeve 20, and fabric or woven coating 21, is provided with an end portion 22 soldered as at 23 to the shell 18.

In use, the Christmas tree lighting outfits, which usually consist of a string of eight lamps, are stretched out, causing tension on the conductor cables 13, 19, and often resulting in breaking the soldered connections and short circuiting the lamps. To obviate this difficulty, in accordance with my invention, there is provided a preferably flexible sleeve 25 preferably made of an elongated string, twine or cord 26 wound about the conductor cables 13, 19, for any suitable length to form a flexible sleeve, preferably disposed adjacent the socket 10. After winding the cord 26 to form the sleeve, the same may be stitched longitudinally, as at 27, to prevent unravelling of the cord. In winding the cord 26, the convolutions are preferably side by side to form a substantially helical sleeve. The cord is preferably wound relatively tight to prevent accidental shifting of the sleeve 25. The sleeve preferably contacts the undersurface 29 of the socket housing.

It will now be seen that a pull on the conductor cables in opposite directions will be taken up by the sleeve 25 which will thus act as a strain relief means. Obviously, the sleeve 25 may be made of any suitable material, it being a dominant feature of the invention to tie the conductor cables together adjacent the socket by a. member adapted to take up the tension or pull on the conductor cables.

It will thus be seen that there is provided a device in which the several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiment above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

In a Christmas tree lighting outfit, in combination with an electrical attachment member having a plurality of spaced terminals therein, a plurality of insulated conductor wires extending into said attachment member and having ends attached to said terminals, and means for clamping said insulated wires together outside of said attachment member for relieving strain on the terminal connections when said conductor wires are pulled in opposite directions, said means comprising a sleeve comprising a wound string disposed about said insulated wires, and said insulated wires being separate on the outside of said member and adapted to extend in different directions beyond said sleeve, the convolutions of said string being stitched together.

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