US810596A - Spring-jack wedge. - Google Patents

Description

No. 810,596. I PATENTED JAN. 23, 1906. G. A. ZUNDELV SPRING JACK WE APPLIGATION FILED NOV. o4.

. form of my 1m rovements.

UNITED STATES PATENT OFFICE.

GUSTAVE A. ZUNDEL, OFNEW YORK, N. Y., .ASSIGNOR TO J. H. BUNNELL AND COMPANY, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Jan. 23, 1906.

Application and November 17. 1904. Serial No. 233,070.

To alt whom it may concern.- Be it known that I, GUSTAVE A. ZUNDEL, a citizen of the United States, and a resident of New York city, county and State of New York, have invented Im rovements in Spring- Jack lNedges, of whic the following is a specification.

This invention relates to spring-j ack wedges or like electrical contact plugs used for switchboards, &c., and has for its object to so con-- struct such a wedge that the usual strain on the flexible conducting-wires in the manipulation of the wedge will not be transmitted to the points of soldering to or other electrical connection with the metallic contact-strips of the wedge.

In the accompanying drawings, Figure 1 is a plan view of a spring-j ack wedge of a usual form, to which my improvements may be applied drawn on a large scale for clear show- 1ng.- Fig. 2 is a side or edge view of the wedge shown in Fig. 1, which view illustrates one Fig. 3 is a central sectional p an of the insulating piece or handle of the wedge shown in Figs. 1 and 2, and Fig. 4 is a sectional view taken on line 4 4 of Fig. 3.

In the construction shown in the drawings the two fiat metal contact-strips A A, Figs. 1 and 2, are suitably secured to and insu ated from each other by the insulating piece or handle B, which here forms the body portion of the wedge. The strips A A have ent-over portions a a lying .in the recesses in the sides of the insulating piece or bod B, and the ends of the conducting-wires O pass through perforations b 1), Figs. 3 and 4, 1n the handle end of the insulating piece or body B and are soldered or otherwise electrically connected to the bent-over ortions a a of the contact-strips A A, as at Fig. 2. This portion of the wedge where the soldering is made is usuall covered, as by winding cord D around the evice,'and a rubber tubing, such as shown at E, in dotted lines in Figs. 1 and 2, may be laced over the handle and parts of the con ucting-wires adjacent thereto.

The wedge so far described is a usual form; but there is a defect in this construction, inasmuch as the constant pull on the wires C C in removing the wedge from the spring-jacks tends to break the connection between the wires and the contact-strips A a- A a. By my present invention I provide for firmly holding the wires in the wedge at a point or points beyond the soldering, whereby strain on the wires outside the wedge cannot be transmitted to the points of electrical connection. Various ways may be employed for accomplishing my object; but the preferred form is shown in the drawings and consists in providing erforations, such as 12 12 in the body or insu ating piece B in a transverse direction to the perforations, b b,Figs. 2, 3, and 4, whereby the conducting-wires C C may be sewed to the piece B. The erforations b b are preferably made throng the body B at opposite walls of the perforations b 1), Figs. 3 and 4, that the sewing-threads F, Fig. 2, may pass through the covering of the wires O O. Also depressions or grooves b b are preferably made in the body B at the ends of the erforations b If, whereby the threads may e fastened and covered or cemented-within the contour of the handle.

I do not limit my invention to the particular form of contact wedge or plug shown nor to the particular manner of securmg the conducting-wires to prevent strain reaching the points of connection with the contact-strips.

I claim- 1. In a spring-jack wedge or the like, the combination of metallic strips and an insulating-body separating them, with conducting-Wires electrically connected to the said strips and sewed to said body.

2. In a spring-jack wedge or the like, the combination of metallic strips, an an insulating-body separating said strips and provided with two sets of perforations, with covered conducting-wires passing throu h one set of perforations in said body and e ectrically connected .to said stri s, and bindingthreads. passing through t e second set of perforations and through the covers of the Wires to secure the wires to the body.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

. GUSTAVE A. ZUNDEL.

Witnesses:

EDITH J GRIswoLD, EDITH C. SARLEs.

Images