US992001A - Pull-knob for lighting-chains. - Google Patents

Description

G. A. KING.- PULL KNOBTOR LIGHTING GHAINS.

APPLICATION FILED FEBJ, 1911.

992,001. Patented May 9,1911.

UNITED srnqns PATENT OFFICE. r

GEORGE A. KING, WATERBURY, CONNECTICUT,

assrsuon ro soovILL MANumc- TUBING COMPANY, OF -WAT'ERBURY, CONNECTICUT, A CORPORATION OF i (1011- PULL-KNOB FOR LIGHTING-CHAINS.

Application filed February 7, 1911. Serial No. 607,197.

certain new and useful Improvement in Pull-Knobs for Lighting-Chains, of which the following is a full, clear, and exact dean easily applied and detachable pull knob scription;

' The object of this invention is to provide for chains attached to electric and other lighting fixtures to operate the lighting devices, so'that the workmen installing the fixture may readily cut the chain to any desired length, and apply the knob by hand or with simple pliers,

.Although the invention is designed primarily. for use out-he chains commonly employed on pull sockets for electric lights, the

Invention is not thereby limited. The invention consists of a knob for chains, made substantially as a hollow globe,

having an opening in it surrounded by spring fingers having reentrant tips, these fingers being produced by slitting the metal of the globe radially, all as I will proceed now more particularly to set forth and finally claim,

In the accompanying drawings illustrating the invention, in the several figures of which.like parts are similarly designated, Figure 1 is an elevation showing the invention applied to an electric light pull socket of conventional forml Fig. 2 is a top plan viewof the knob detached. Fig. 3 is a transverse section taken substai'itially in the plane of line A B, Fig. 2. Fig. 4 is a transverse section similar to Fig; 3 with a portion of the chain in place; the last three figures being on a larger scale.

Confining the description to the illustration in the drawing, but without thereby limiting the invention, 1 is a pull socket for electric lights, of any ordinary construction,

and 2 is a chain composed of a series of balls and connecting links 1n usual form and such as commonly employed in connection with such lighting fixtures.

These cha ns are ordinaril supplied with a knobmade from two she s. Before applying to the chain, the hole inthe knob 15 large enough to allow the chain to enter freely, and after. inserting the chain, the

" done in the factory where-the 1i metal of-the knob is closed around the ball Patented May 9, 1911. p

of the chain by means of a press operation.

This makes it advisable to "have this work is manufactured. However, it frequently 1s necessary, or desirable to apply chains of different lengths to diflerent fixtures and while with the previous method the chain ghting fixture can be shortened by cutting it off at the other end from that to which the knob is fastened, yet when a longer chain is desired the workman in installing the fixture is not able to close the knob on the chain in a satisfactory and workmanlike manner owing to the necessityof it' beingdone by means of tools."

My invention is designed to meet these exigencies, and it consists of a knob or 1101- low globe-like structure 3, having a central. opening as at 4. The knob is shttcd, as at 5,

to form a series of fingers (3, laving the re entrant tips 7 surrounding the opening or hole 4. Thehole with its reentrant'or inturned finger tips is slightly smaller than the ball 8 of the chain, so that in forcing said ball through the opening and past these linger tips into the hollow knob, the fingers yield laterally and then by their resilience, after the chain ball has passcd'into the knob, return and again contract the knob and prevent the escape of the chain in ordinary use. The knob, however, may be detached from the chain by a hard pull designed to separate them; but the better practice is to cut. the chain close to the knob and let the last ball of the chain drop into the interior of the knob. The new chain then may be readily inserted in the knob and .can be made of any desired length.

By the construction described,- a very simple and easily applied pull'knob for chains is provided.

What I claim is 1. A pull knob, consisting essentially of a hollow globe-like sheet metal structure provided with anopening therein, and slittcd radially around said opening to form re silient fingers, the tips of said' fingers being bent back within the knob and surrounding the opening-so as to] engage and hold an article inserted in said knob and retain it against accidental escape. Y

2. A sheet metal pull knob for chain s, pro vided with an opening, and spring fingers integral with the knob and havmg reentrant tips within the knob surrounding said opening, combined with a chain'having a link adapted to distendthe opening and pass into the knob and allow the fingers to close 5 in around the o enin and their tips to spring in behind tie lin within the knob.

-In testimony whereof I have hereunto set my hendthis-sixth day of February I 1911. v

'- GEO. A. KING.

' Witnesses E. WITHEY, E. S. SANDERSON.

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