US115241A - Improvement in devices for attaching booms to masts - Google Patents

Description

EQROGERS; improvement in Devices for Attaching Beams to Masts.

Patented May 23 at We nznmnt scenes, 0F warnnrosnassicnon TO HIMSELF AND H.

a ROWN, onnnw LONDON, CONNECTICUT.

Letters Patent No. 115,241, dated May 23,1871.

IMPROVEMENT m DEVICES FOR ATTACHING Booms TO MASTS.

The Schedule referred to in these Letters Patent'and making part of the same.

To all whom itvmay come m i Be it known that I,:EZE-KIE;L ROGERS, of the town of Waterford, and county of New London and State of Connecticut, have invented a newand useful De-- vice for Attaching Booms 'toMasts. V r

1 My invention consists, in pivoting the jaws of the boom tohopposite sides of a jointed shackle; and I do hereby declare-that thefollowing specification, taken in connection with the d-rawing furnished and forming a part of the same, is a c1ear,true, and exact description thereof. 1

1 Referring to the drawing- Figure lrepresents, in perspective, a mast with-a boom attached thereto by means of my improved de-- vice; i

U Figure 2 represents, in perspective, the jointed shackle detachedffrom the boom and mast.

Aistheh1ast. i r

j B,othe"boom. i O and, O arefthe jaws of the boom.

D is. themainportionjof theshackle. At its-opposite sides are projecting spots or studs'd. e and e arestraps attached to the two jaws, of the a boom, Each of these straps embraces one of the'studs d, thuspermanently connecting with the jaws of the boom themain portion D ofthe shackle. F is a binding-strap P01 auxiliary portion of the shackle. It completes the embracing circle. Its ends are connected, by ears and slots, to the corresponding ends, of the main portion of the shackle.

The interior of the main and auxiliary portions of the shackle are lined with wood, so that no undue wear or friction can. occcur between them and the must at the points of contact It-is desirable in boom-connections to have a free vertical movement when desired, and one which, while it connects the boom firmly to the mast, will also admit of the greatest possible freedom of a semi-rotary movement without materially chafing or defacing the mast at the point of contact.

It will be observed that in hoisting the boom like the one herein described the shackle is lifted evenly,

on the mast whether the end of the boom be elevated or depressed, and that no cloggingof the shackle can possibly be effected by the position of the boom.

For mounting gafls I employ only the main shackle D, which is pivoted, as already described, to theirjaws. 1 Having thus described my invention, I claim as new and desire to secure by Letters Pat- .ent--- 1. The semicircular shackle D, provided with projeoting studs d for connecting with the jaws of the boom, and the binding-strap E, the two being con-

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