US325653A - Jesse h - Google Patents

Description

(No Model.)

J. H. BUNNELL.

ELECTRIC SWITCH PLUG.

No. 3251353. Patented Sept. 8, 1885.

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UNITED STATES PATENT EFIcE.

JESSE H. BUNNELL, OF BROOKLYN, NEW YORK.

ELECTRIC-SWITCH PLUG.

SPECIFICATION forming part of Letters Patent; No. 325,658, dates. September 8, 1885.

Application filed November 13, 1584.

To all whom it may concern.-

Be it known that I, JESSE H. BUNNELL, a citizen of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Electric- Switch Plugs, of which the following is a specification.

My invention relates to certain improve ments in the mode of attachment of flexible conductors to the movable wedges or plugs of a telegraphic or electric switch-board; and its object is to avoid liability of said flexible eonductors being broken by reason of frequent handling, at or near their point of attachment to the wedge or plug. Ieffect this by providing the insulatinghandle of the plug with a projection, which projection is preferably provided with grooves or channels for receiving the ends of the flexible conductingwires, and with a flexible sleeve of india-rubber or other like material, which fits over the grooved or channeled projection and the ends of the flexible cord or conductor, and thus serves to protect the same from accident or injury.

In the accompanying drawings, Figure 1 is a front elevation of my improved switclrplug with the movable sleeve slipped down so as to exhibit the manner of attachment of the ends of the flexible conductor. Fig. 2 shows the device when in its proper position for use, and Fig. 3 is a transverse sect-ion in the plane of the dotted line 3 3 in Fig. 2.

In the drawings, A represents one of the metallic face-plates or terminals upon the body B of the switclrplug. The latter is formed of hard rubber or other suitable material,and is enlarged at I) in the ordinary manner, as shown, so as to form a convenient handle.

D is a flexible insulated cord containing wires or conductors c c, which are properly insulated from each other, and covered with woven or braided material in a well-known manner, as shown. One of these:conductors, 0, passes through a holein the handle b of the (No model.)

plug 13 and along the grooveG to the metallic terminal A. The other wire, 0', is conducted in like manner through another groove on the back side of the plug B to another similar metallic terminal in the rear of A.

Heretofore it has been usual to pass the Wires 0 0 directly from the upper end of the woven flexible cord D into and through the holes in the handle I) to the terminals A; but this mode of construction has rendered the conductors extremely liable to breakage from being frequently bent back and forth just at the point of their insertion into the handle I). In order to obviate this objection I provide the handle I) with a projection, B, preferably forming an integral part thereof, which is fun nished with grooves or recesses on each side, as shown at d d in Fig. 3. Through these re cesses the conductors c and c are carried, and secured in place by a suitable binding, e. A tube or sleeve, E, of some durable and flexible material-such as india rubber-is then slipped over the joint,as shown in Figs. 2and 3. This inclosing-slccvc serves to effectually protect the parts, and to support the conductors at the point of flexure, so that they are not liable to become injured by frequent and continuous use, and at the same time renders them convenient of access for inspection or repairs.

1 claim as my invention The combination, with the wedge or plug of an electric switchboard, of a projection upon the handle of said wedge or plug for receiving the conducting-wires, and a flexible tubular sleeve for inclosing said projection and protecting said wires, as set forth.

In testimony whereof I have hereunto subscribed my name this 12th day of November, A. D. 1881.

JESSE H. BUN NELL.

YVitnesses:

DANL. W. EDGECOMB, CHARLES A. TERRY.

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