US1264677A - Securing device. - Google Patents

Description

C. H. MURRELL.

SECURING DEVICE. APPLICATION FILED .IAN.20. I917- Patented Apr. 30, 1918.

avwamtoz UNITED STATES PATENT OFFICE.

CLIFFORD H. IbflI'U'RlR/ELIJ, 0F ROANOKE, VIRGINIA, ASSIGNOR TO MURRELL FASTENER SECURING DEVICE.

Specification of Letters Patent.

Patented Apr. 30, 1918.

Application filed January 20, 1917. Serial No. 143,504..

To all whom it may concern:

Be it known that I, CLIFFORD H. MURRELL, a citizen of the United States, residing at Roanoke, in the county of Roanoke and State of Virginia, have invented certain new and useful Improvements in Securing Devices, of which the following is a specification.

This invention relates to an improved method of securing articles such as electric insulators or the like to thin walls of metal such as metal ceilings, and includes a specially formed coil of wire by which the said method is put into use. The primary object of the invention is to simplify the task of applying exposed electric wires.

The invention consists of the novel features of construction and manipulation as will be herein set forth and claimed.

Inthe drawings, Figure 1 is aside elevational View of the coiled wire of my invention and Fig. 2 a vertical sectional view showing an insulator applied to a metal ceiling in accordance with my improved method.

In these drawings, 1 represents a metal ceiling and 2 a commercial porcelain insulator made to receive and hold the wire 3. These are commonly secured to wood work by means of wood screws. In the application of these as I practice it I employ a sim1-- lar threaded member or wood screw 4. The thin ceiling plate 3 is first pierced at 5 by means of a punch or nail set, the hole formed being preferably slightly larger than the body of the screw 4. I then provide a wire coil 6 which is formed substantially as a tapered helix. The smallend of this coil is entered axially in this hole 5 as far as the tapered sides of the coil will admit and is then rotated axially so as to thread all except a small amount (in practice, about one turn) of the, wire coil through the metal The large end of the coil being Somewhat greater in diameter than the body of the screw or than the pierced hole, it will be seen that the coiled w1re now overlies the metal around the hole. The screw 4 is then passed througli the insulator andthe threaded end inserted through the hole and up inside of the coil. The screw is .then rotated ceiling.

in the usual manner and as it is turned the wire coils' adapt themselves in both diameter and pitch to the threads of the screw and form in effect a nut. As the screw is rotated the coils travel down the threads and pack together above the metal ceiling late, at the same time expanding, and the Insulator is firmly clamped thereto with the same efiectas though the screws were driven into wood;

Thus I have described the article of my invention and its use, and its simplicity, strength and practicability will be evident -to mechanics .and those familiar with such arts.

What I claim is:

1. In a securing device, a section of wire wound substantially into the form of a tapered helix, small at one end and larger at the other end, and in combination therewith an externally screw -threaded member, the

helix being at thesmall end of such diam- 'et er that the wire will fall within, conform themselves to and engage the threads of the threaded member, and being of such diameter at the larger end that the coils will threaded member.

3. In a securing device, a thin metal plate having a pierced hole therein, a screw extending through the article to be secured and through the thin plate, a section of w1re coiled into the form of a tapered helix, the

one end being of such diameter as to snugly fit. into the threads of the said. screw and also to pass axially through the said ierced hole, the larger end being of such diameter as will not pass' axially through the said hole.

' In testimon whereof I aflix my signature .in presence 0 two witnesses. CLIFFORD H. MURRELL. Witneses:

R. F. Downy,- ALLEN F. FERRELL.

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