US1501961A - Snap hook - Google Patents

Description

July 22 1924.

J.- P. .MATTSON SNAP HOOK Fil'ed Nov. 8, 1923 JNVEJVTOR.

Y flTTORNEY.

at its end the usual ring Fatentecl July 22, .1924.

a tso gsi JOHN P. MATTSON, OF MINNEAPOLIS, MINNESOTA.

SNAP

Application filed'November s, 1923.

To all whom it may concern.

Be it known that 1, JOHN P. MATTSON, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain "new and useful Improvements in Snap Hooks, of which the following is a specification.

My invention relates to snap hooks used on harnesses, bridles, draft appliances and other devices where snap hooks are used.

The object is to provide a simple snap hook that can not be opened or closed accidentally.

In the accompanying drawing:

Fig. 1 is what may be termed a front edge view of my improved snap hook attached to a leather strap and engaged in the ring of a bridle bit.

Fig. 2 is a section about as on the line 22 in Fig. 1.

Fig. 3 is a portion of Fig. 2 with the hook proper in open position.

Fig. 4 is a detail front view of the hook 9 only. i Q

Referring to the drawing by reference numerals, 5 is a portion of a bridle bit having 5*. To illustrate at least one of the uses of my snap hook I have shown it as engaged in said ring 5*.

The snap hook comprises a body piece 6 having an eye 7 adapted to be secured to a leather strap 8, and a hook member 9 pivoted at -l0 to the body piece near the rear end of a longitudinal slot 11 formed therein. The pivoted end of the hook has a plain angular end face 12 between which and the nearest terminal 13 of the slot is inserted a slidable key 14 which prevents accidental opening of the hook by resisting the corners 9 of its flat end. The key has a shoulder 15 engaged by the swingable end 16 of a leaf spring 17, which has its other end 18 supported in a notch 19 in the body piece. A small cross bar or bridge 20 in the slot gives tension to the leaf spring and also engages an offset 21 of the spring to hold it constantly with its end 18 in the notch 19.

When the hook is to be opened the operator pushes with a finger at the end 14 of the key 14 until the latter gets into the position shown in Fig. 3, and thus presents its clearance 14 diagonal to the heel 9 of the hook 9, and thereby allows the hook to tion to the terminal of HOOK.

Serial No. 673,615.

be swung open. When open it will stay thus until closed spring is not strong enough to close the hook as long as the heel 9 tion to be swung by the key 14 and its spring, but rather to resist closing of the hook by standing against the surface 14 by the hand, because the.

is not in a posi- I The hook might even swing so faropen as toresist forcible closing, but such swinging is prevented by side shoulder 22 on the hook stopping against the edges 23 of the slot in the body piece. A. touch of the hand will however close the hook, and when closed or nearly closed the spring 17 and key 14 act automatically to lock it until the key is again pressed or pushed into unlocking position. In other words the contact of the heel or .part 14 of the key and heel 9 of the hook hold the hook closed. When heel 14 is pushed away the hook 1s easily opened.

It will be noted that the key may have a notch 24 for the end of spring 17. It may also havea rest in a notch 26 in the body piece either or both means will prevent undue forward movement of the key 14 which might cause it to get separated and lost.

Other means may of course also limit the movement of the key but as they would be mechanical equivalents to the means shown I consider it superfluous to describe them;

The device may be either drop forged or cast. In casting it no core is needed since the sand in the cope will easily lift out of the slight depressions 19 and 26 and the sand in the flask will draw. downward out of the groove 11.

lVhat'I claim is:

l. A snap hook comprising a body'member having an eye for securing it in place of service, said member having a longitudinal slot, a second member having a flat and angular end pivoted in the slot in spaced relathe slot nearest "said eye, the other end of the second member being hook shaped and arranged to close with its point against the free end of the body member, a key fitted to slide transversely in the slot snugly between the terminal thereof and the angular end of the pivoted hook member, whereby the latter is normally held in closed position, a spring arranged to normally hold the key with the hook closed, said ,key having its rear end protruding through the slot to give a chance IOU to push it endways when the hook is to be p Said; sav ha i g ing e. heels an is sufliciently pushe of its spring.

2. The structure specified-- in claim 1, and

forward movement of means limiting the the slide.

3. The structure speei fied which e end th ngtbenea1 en 1111 1t, mm -9 hish P. he is. onetendi in t ing th P sh; t ei-a. i i ig e e wans a Qlearanee al o pe v when t ey d against the resistance aim n said spring is a leaf spring held by from and: of he at and press ng gain the ey relation, t he ation with the hook,

and said spring being readily detachable from the body member.

5. The stnucturespecified in claim 1,, said hook member of the device having one or more side shoulders arranged to stop against the body piece when the hook is fully opened.

6'. The structure specified in claim 1, said hook memberv of the device having one or more side shoulders arranged to stop against the body piece hen the hook is,

fully opened, and said key having an edge portion adapted to engage the pivoted end of the hook and prevent accidental closing of the hook- When' its shoulders are against e body P Intestimony whereof I affi my signature.

JQHN P. MAJTTSON.

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