US408961A - Carriage-pole crab - Google Patents

Description

(No Model.)

J. G. ENGLISH.

GARRIAGE POLE GRAB. No. 408,961. Patented Aug. 13, 1889.

UNITED STATES PATENT OFFICE.

JAMES G. ENGLISH, OF NEW HAVEN, CONNECTICUT.

CARRIAGE-POLE CRAB.-

SPECIFICATION forming part of Letters Patent No. 408,961, dated August 13, 1889.

Application filed June 17, 1889. Serial No. 314,614. (No model.)

To all whom it mag concern:

Be it known that I, JAMES G. ENGLISH, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in Carriage-Pole Crabs; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

, Figure 1, a top view of the crab as applied to a carriage-pole; Fig. 2, a front end view; Fig. 3, a rear or inner end view; Fig. 4c, a 1011- gitudinal section of the socket on line a; m, Fig. 3 Fig. 5, an inner end view of the tip; Fig. 6, a top view of the tip as applied to a carriage-pole; Figs. 7' and S, modifications.

This invention relates to an improvement in the device applied to the tip of a carriagepole, by which to attach the holdback strap or chain commonly called pole-crab.

In the more general construction the poleerab consists of a socket adapted to be set onto the end of the pole, the socket having two arms projecting laterally therefrom in opposite directions, the arms being made intogral with the socket, and each arm terminating in an eye or hook, by which to attach the holdback strap or chains and the crab rigidly attached to the pole. It is desirable that the crab should have a limited amount of oscillation on the pole as its axis of oscillation, in

order to allow it to yield to the diiterential 'in a socket of thimble shape constructed Wit-h oppositely-projecting arms and adapted to set onto the end of the pole prepared to receive it, the outer surface of the pole within the socket, and'the inner surface of the socket, being the one constructed With an annular groove having a longitudinal openinginto it at one point, and the other provided with a radially-proj ecting stud corresponding to said groove and adapted to enter said groove through said opening, but in a position diametrically opposit-e said opening, when the crab is in its normal position on the pole, and as more fully hereinafter described.

A represents the socket; B B, the two laterally-projecting arms, terminating at their outer ends in the usual eyes or loops C, or in any required shape, for attaching the holdback straps or chains, the socket and its arms being cast integral. The socket is of thimble shape, the shape of its exterior and the arms not being materially different from the usual construction of pole-crabs. The socket is constructed with an annular groove a upon its inside and near its inner or open end, and from the open end an opening I) is made into the said groove, as seen in Fig. 4. The shape of the interior of the socket is round in transverse section and preferably tapering from its inner to its outer end, as shown.

'D represents a metal tip for the pole. (See Fig. 5.) It is of thimble shape, adapted to be set 011 and be secured to the end of thepole E, as seen in Fig. 6. The exterior of the tip D corresponds in shape to the interior of the socket, and so as to permit the socket to be set onto the tip, as seen in Fig. 1, and so that the socket may oscillate thereon, the tip forming the axis of such oscillation.

0n the tip D, and at a point corresponding to the groove a in the socket, is a radially-projecting stud (1, adapted to pass through the opening 1) into the groove (6 when the socket is being set onto the tip. The position of the stud (Z with relation to the opening I) is diametric lly opposite, or nearly so, as seen in Figs. 3, 4, 5, and (3, said figures showing the normal relative position of the socket and tip when applied. The tip D is fitted and secured .to the end of the pole E, as seen in Fig. 6, the stud d shown as upon the upper side, the opening I) being on the under side of the socket. The crab is thus inverted, so as to bring the openingb upward and into line with the stud d, and then set onto the tip. The stud d enters through the opening 1) until it reaches the groove a. Then the or b is turned on the tip to its right-side-up position. The groove passing over the stud interlocks the crab and tip against longitudinal movement, but leaves the crab tree to oscillate on the tip.

As the oscillation of the crab under natural working is very much less than half a circle, the stud (l and opening Z) will never come into line under such natural or usual working of the crab consequently there is no liability of accidental detaclunent, but yet the crab is free to be removed by simply turningit upon the tip until the opening I) comes into line with the stud (I. \Vhen the crab is applied to the pole, it does not or may not diflfer in appearance from the usual construction of crab.

Instead of constructing a tip, as D, to be applied to the pole and earrythe interlocking stud, the tip may be omitted and the stud applied directly to the pole. T his modification is too obvious to require illustration.

If preferred, the annular groove 0, and the opening Z) may be formed on the tip 1), as seen in Fig. '7, and the stud (Z formed in the socket A, as seen in Fig. 8.

I claim-- 1. A carriage-pole crab consisting of the socket A and arms l ll, projecting therefrom, the said socket adapted to set onto and oscillate upon the end of the pole, the inner surface of the socket and. the surface of the pole upon which the socket oscillates, the one constructed with an annular groove a, having a longitudinal opening Z) into it, and the other provided with a stud (Z, corresponding to said groove and adapted to enter said groove through the said opening, the said opening and stud being at substantially opposite points when the crab is on the pole, substantially as specified.

2. The combination of the socket A, having laterally-projecting arms B B,With the metal tip I), adapted to be attached to the end oi. a carriage-pole, the exterior surface of said tip of a shape corresponding to the inner surface of the socket, and upon which tip the socket: with its arms may oscillate, the socket and tip being the one constructed with an annular groove (0, having a longitlulinal opening 1) into it, and the other with a corresponding stud (Z, substantially as and [or the purpose described.

JAMES G. ENGLISH.

Vitnesses:

Jenn B. KENNEDY, Janns J. CONNOLLY.

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