US590481A - griffith - Google Patents

Description

( o Model.)

W. H. GRIFFITH. CHAIN LINK.

Patented Sept. 21,1897.

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ATTORNEYS,

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UNITED STATES PATENT OFFICE.

.WILLIAM ll. GRIFFITH, OF NE\V YORK, N. Y.

CHAIN-LINK.

SPECIFICATION forming part of Letters Patent No. 90,481, dated September 21, 1897.

Application filed July 3, 1897. SerialNo. 643,432. (No model.)

T0 at whom it may concern:

Be it known that 1, WILLIAM H. GRIFFITH,

- residing in the city of New York, county of New York, and State of New York, have invented a new and useful Improvement in Chai n-Lin ks, of which the following is a specification.

My invention is in the nature of an improved link for chains of that general form known as the figure-eight pattern and of the class which are made by taking a piece of wire and bending it to the proper shape and connecting its ends by wrapping or tying them without welding. An experience of twenty-four yearsin the chain business has demonstrated to me that chains made in this manner have not been a success for the reason that on the one hand they are too weak and pull out the bent ends under heavy strain, or if the ends be more thoroughly wrapped or interlocked a bulky knot is formed with projecting ends, which is not only unsightly, but is continually catching into and rubbing whatever it comes in contact with.

My invention is designed to overcome these objections; and to that end it consists in the peculiar form of link hereinafter more fully shown and described with reference to the drawings, in which- Figure l is a front view of the link. Fig. 1 is an edge View from the left-hand side of Fig. 1, and Fig. l" is a back View. Figs. 2, 2, and 2 are similar views of a slight modification of the link. Figs. 3, 3, and 3 are similar views of a further modification, and Figs. 4, 4L, and 4 similar views of a still further modification.

In the drawings, Figs. 1, l, and l", a a represent one of the loops of the link, and b b the other loop. The opposite sides a b of the two loops run continuously the one into the other, crossing at the center 0 from one side to the other. The two end sections of the wire a and b have each an exactly similar connection with the middle part c of the wire. This consists of a double-coiled eye with one coil of the eye at right angles to the other coil. Thus the end a of the wire is bent around the leg I) to form one eye ct, and the extreme end is then wrapped at right angles to a around the loop-section (L as shown at a. The other wire end, 19 is wrapped around a to form the eye I) and then at right angles to b is wrapped around wire-loop section 19 as shown at I). hen so wrapped, there are two thicknesses of wire lying in the fork of each loop and one thickness of wire lying in the external obtuse angles on the sides of the link and between the loops. This enables the wraps of the knot to be sunken toward the center to form a most compact and unobtrusive knot and one that lies perfectly fiat and is perfectly symmetrical, presenting on the frontface two parallel convolutions a b with the wire ends of eyes a b lying between them and presenting on the back face (see Fig. 1 quadruple coils arranged in symmetrical pairs. With this form of link the ends are secured very strongly by double eyes or wraps at right angles to .each other, and a compact and sightly knot is formed in the center of the link which resists the greatest strain to which such chains are ordinarily subjected.

Figs. 2, 2, and 2 show a slight modification of the link in which one of the ends a of the wire is turned inwardly, the same as in Fig. 1 but the other end is reversed or turned outwardly.

In Figs. 3, 3, and 3 the link-legs b and a are continuous and cross at c from one side and one end to the other side and other end, as in the preceding cases, but the double eyes a and a and b and b are dilferently arrangedthat is to say, the convolutions a b are (see Fig. 3) parallel with each other and longitudinal to the link and both pass through the two loops of the link, while the terminal convolntions or eyes a and b are turned around the outside in the obt use-angled fork between the loops, and their plane is substantially transverse to the link.

In Figs. 4, L, and 4t I show a loop substantially the same as in Figs. 3, 3, and 3 except that one of the loops is elongated and twisted.

In all these figures it will be seen that two thicknesses of wire lie in the fork of each loop and one thickness'of wire lies in each obtuse angle on the outside between the loops, which forms avery compact knot and makes a very strong link in which the ends are secured by double and symmetrically-arran ged wraps.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is p 1. Alink made of a single piece of wire bent to form two loops of the figure-eight patdouble symmetrical knot at the center of the link, substantially as and for the purpose described. v

2. A link made of a single piece of wire bent to form two loops of the figure-eight pattern, the end portions of the wire being connected to the middle portion with double eyes arranged symmetrically with two thicknesses of wire lying side by side in each fork of each loop, and a single thickness of wire lying in stantially as and for the purpose described.

, WVILLIAM H, GRIFFITH.

\Vitnesses:

SoLoN C. KEMON, J. MIDDLETON.

the external angles between the loops, sub- 25

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