US499942A

US499942A - Safety snap-hook

Info

Publication number: US499942A
Authority: US
Publication date: 1893-06-20
Anticipated expiration: 1910-06-20

Description

(No Model.)

A. .J. SLOAN. SAFETY SNAP HOOK.

No. 499,942. Patented June 20, 1893.

WITNESSES lNVENTO/Y a1 ATTORNEYS.

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To all whom it may concern:

NITED STATES PATENT OFFIQE.

- ALFRED J. SLOAN, OF CLYDE, .NE\V YORK.

SAF ETY SNAP-HOOK.

SPECIFICATION forming part of Letters Patent No. 499,942, dated June 20, 1893. Application filed April 7, 1393. Serial No. 469,440. (No m d l- Be it known that I, ALFRED J. SLoAN, of Clyde, in the county of Wayne and State of New York, have invented a new and useful Improvement in Safety SnapHooks, of which the following is a full, clear, and exact description.

This invention relates to improvements in snap hooks for harness, and other purposes, and consists in thepeculiar construction and combination of parts, as is hereinafter described and claimed.

Reference is to be hadto the accompanying drawings forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a perspective view of the device shown in open adjustment. Fig. 2 is a plan view. Fig. 3 is a partly sectional side view,

with the hook opened. Fig. 4 is a side view.

with parts in closed adjustment. Fig. 5 is a plan view of a modified form of theimprovementin alocked condition; and Fig. 6 is a plan View of a further modified form of the device.

The device in brief, comprises an adjustable spring jawed frame, and a hook bar pivoted between the jaws of said frame, the body of the hook and free ends of the frame limbs, having a peculiar conformation, that adapts them for efficient service. as a safety snap hook, provision being made to lock the hook bar in closed adjustment when this is desired, as will be more fully explained.

The frame A, is formed from metal that is slightly elastic, and may be cast, forged, or cut by dies and subsequently bent into shape, as may be preferred. The frame piece A,'may be bent to afiord a straight transverse rear bar a, and two parallel portions a, that are bent toward each other at b, and then in parallel at 0, thus providing two spring limbs d, that are sufficiently separated to receive the parallel sided body of the hook bar B, between them. A cross bar a is attached by its ends to the inner sides of the parts a of the frame,-

and is parallel with the rear bar a, being properly spaced therefrom. Said bar a may be riveted to the parallel frame piece a, or be cast integral therewith, and from its connection with the latter stifiens the frame structure and aids the Spring action of its limbs d.

The hook bar B, before mentioned, is furnished with an edge-curved book 6, that has its point e, rearwardly extended so as to properly approach the protuberate edge portion 6 of the hook bar, which swell is located at the heel of the hook, and affords a suitable enlargement of the bar B, for the formation of a pivot perforation therein at a correct distance from the ends of said bar. The end portions d of the frame limbs d, are widened a proper degree, and are preferably edge curved at their juncture with the portions of these limbs that are near the bends c. The widened ends d of the frame B, are notched as at 1 so as to afford flared edges for said notches, and behind the notches at a proper point the limbs (Z, are oppositely perforated for the reception of a rivet h that is inserted through the perforation of the hook bar, and thus adapts the latter for vibration between the limbs d that have an adjustable spring pressure thereon effected by tightening or loosening the rivet h. The curvature given to the edges of the limb end portions d, and opposite edges of the hook e, adapts these edges of parts to correspond with each other,

and permits the hook to lie partly embraced and its point concealed between the limb ends as indicated in Fig. 4, and it will be seen, that when the hook bar is thus adjusted an aperture is produced as at g, which will receive a bridle bit ring,or like device on a hitching post if the snap hook is placed on the end of -a halter for it's detachable connection with a stable object.

On the rear end of the hook bar B,a thumb piece 0' is formed which occupies part ofthe space in the wider part of the frame forwardly of the cross bar a and is thus conveniently located for vibration by thumb or finger pressure when the closed hook e is to be rocked to carry it away from the frame limbs d, as shown in Figs. 1 and 3.

A transverse perforation 2' is formed in the hook bar B, near the thumb piece h, and aligning perforations i, are produced in the frame limbs of, at a point which will permit the holes in the frame and, hook bar to register with each other when the latter named piece is in closed adjustment, and when it is desired to doubly secure the hook in a closed condition for any desired length of time, a small piece of flexible wire i", may be inserted, and its ends bent over so as to retain it, as shown in Fig. 5, the removalof this locking piece being readily effected by straightening or cutting off one end of the same with cutting pliers or any other available tool.

In Figs. 5 and 6, the edges of the frame A, are shown rounded, this form being preferred when the frame is cast into form, as it is then required to be somewhat thicker than if out and bent from sheet metal, and in Fig. 6, the

frame is given a circular formation atits rear end to permit the connection therewith of a rope halter or other-strand that is not fiat, the other shape shown being best adapted for the attachment of a strap end, which is inserted between the cross-bara and rear bar a, then lap folded and secured by sewing or.

other means, so as to neatly afiix the snap hook on the end of the strap.

It will be seen that from the shape of the hook e, and the manner of notching the limb ends (1-, that when the hook is in a foldedcon dition, the furcated end portions of the limbs which embrace the hook body in part and its point completely, will form guards, that will prevent the hook from lateral displacement when a ring or rounded strap is locked in the space 9, the curvature of the inner edge on the hook, causing applied draft strain to lie about in the same plane with the transverse center of the limbs d, and pivot center of the hook and frame,a side strain being resisted by the guards on the limbs, in an obvious manner. 7

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a frame widened at the rear, a cross bar in said widened part,

and notched parallel adjacent limbs at the front of the frame, widened at a right angle to the widened rear part of said frame, of a hook bar pivoted between said limbs and ad- .j ustably spring-pressed thereby, and guarded by the forked members of the limbs, substantially as described. v

2. The combination with a framewidened at the rear, a crossbar near the rear bar of the frame, and parallel limbs at the front of the frame, transversely perforated to receive a locking bar, and forked at their ends, of a hook bar pivoted between the limbs and adj ustably spring-pressed thereby, said bar having a transverse perforation therein, a thumb piece on the rear end of the hook bar, 'anda lockin g bar adaptedto enter the perforations in the limbs and hook barwhen the hookbar is in closed adjustment within the frame, substantially as-described.

ALFRED J. SLOAN. Witnesses.

JACOB STACK, WILLIAM.E.,MEADE.