US921380A - Wire chain-link. - Google Patents

Description

PY. EGGE, WIRE CHAIN LINK. APPLIUATION FILED APR. 25, 1908.

' 921,380. Patenteamay 11, 1909.

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FREDERICK EGGE, OF BRIDGEPORT, CONNECTICUT.

WIRE CHAIN-LINK.

To all whom it may concern:

Be it known that I, FREDERICK EGGE, a citizen of the United States, residing at Bridgeport, in the county of Fairiield and State of Connecticut,- have invented certain new and useful Improvements in Filire Chain- Links; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in. the art to which it appertains to make and use the same.

' My invention relates to wire chain links, but especially has reference to a chain made of wire and adapted to run over a pulley in order that it may be utilized as a window sash chain.

The object of my improvement is to provide a window sash chain made wholly from wire, the tensile strength of which shall be at least double that of the wire itself, while the chain is lighter than a sheet metal chain of the saine strength, and is admirably adapted to run. over a pulley in that the contact points of concatenation are all rounded surfaces.

Vith these ends in view my invention consists in the details of construction and combination of parts'hereinafter fully described and then articularly pointed out in the claim whic concludes this description.

In the accompanying drawing Figure l is a plan view of a section of chain the links of which are made in accordance with my irnprovement-Fig. 2 a side elevation of the same, and Fig. 3 a detail enlarged broken plan view of a artially completed link.

Similar numbers of reference denote like parts in the several figures of the drawing.

Heretofore a wire chain has never been utilized as an article of commerce as a wine dow sash chain, for, although it has been proposed to make a wire chain for this purpose, nevertheless no such chain has ever been constructed which had a strength greater than that of the wire from which it was made.

My improved chain is composed of links each of which is composed of double wire throughout except at one location where the wires are tripled, in which latter instance two wires are dis osed around a third `so as to afford a smoot i round bearing surface, all of which will be clearly understood from the following description My improved chain is composed of links each of which is formed from a given length of wire hereinafter called a uwire blank,

Specification of Letters Patent.

Application led April 25, 1908.

Patented May 11, 1909.

Serial No. 429,216.

the ends of which are bent to form loops l the inner portions whereof are separated by the middle portion 2 of the blank which portion eventually becomes the bow of the completed link, the same i 7ill hereinafter be referred to as the bow wire. The blank with the loops formed at the end thereof as hereinbefore described is bent so as to bring these loops side by side in coincidence, the points of this bending being at the inner ends of the loops, so that after this bending is completed the loops and the bow wire will stand in planes at right angles to each other. After the loops are formed and bent side by side in coincidence, the free ends of the wire are coiled around the bow wire cr middle portion of the blank in a peculiar manner, one of these wires being disposed in open coils 3, from the base of the loop which it forms, around this bow wire, so that its extreme end 4 points in a certain direction; the other end of the wire is coiled, from the inner end of its loop, around the bow wire so as to form coils 5 between the coils 3, the extreme end 6 of these coils 5 extending in a direction substantially op Josite to that in which the end l extends. n other words, the free ends of the wire blank at the inner ends of their respective loops are intertwined around the bow wire so that their respective extremities are adjacent to opposite loops and extend substantially in. opposite directions.

Referring to Fig. 3, l have shown one of the free ends of the wire disposed in op .n coils 3 around the bow wire 2, the other free end of the wire being shown in the initial stage of coiling around the bow wire between the coils 3.

The loops 1 are of a general pear shape, being comparatively large at their outer portions with respect to their inner portions, and in forming the chain a partially coinpleted link is threaded through the loops of previously completed links.

There are several methods by which my improved chain may be made, but thev method of manufacture of the same or the order in which the several steps in the bending are performed are immaterial and have nothing to do with the present invention which latter relates solely to the chain as an article of manufacture.

From the foregoing it will be clear that my improved link has the tensile strength of a double wire throughout its entire structure except at thc bow portion, where the strength of three wires is provided. Furthermore, the coiling of the extremities of the wire blank around the bow wire leaves a smooth rounded surface which, in the chain itself, engages the rounded outer ends of the loops, so that it will be readily understood that the contact points of concatenation in the chain are all rounded surfaces, thereby preventing the cutting of one link into another and affording a chain which cannot kink.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is A chain link composed of wire having twin loops at one end and a connecting bow wire at the other end, one extremity of the wire being disposed around said bow wire in open coils while the other extremity of the wire is disposed around said bow wire in coils which are intermediate of the first named coils and which extend in an opposite direction.

In testimony whereof I aIiX my signature in presence of two witnesses.

FREDERICK EGGE.

Witnesses:

F. W. SMITH, Jr., M. T. LONGDEN.

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