US180162A - Improvement in tackle-blocks - Google Patents

Description

2 Sheets-She e t 1.

J. SIMPSON &. A. A. POPE. TACKLE BLOCK Patented July 25, 1876.

No.180,16Z-.

. Witnesses aw. Mfia Inventor Q MX WA$ 90M Urrrm STATES PATENT Orrron JOHN SIMPSON AND ALFRED A. POPE, or CLEVELAND, o H IoF IMPROVEMENT mTAcKLc-eL'opKs.

Specification forming part of Letters Patent No. 180,162, dated July 25, 1876; application filed June 23, 1876.

To all whom it may concern:

Be it known that we, JOHN SIMPSON and ALFRED A. POPE, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented a certain new and Improved Tackle-Block; and we do hereby declare that the following is a full, clear, and complete description thereof, reference being had to the accompanying drawings, making part of the same.

Figure l is a side view of a one -sheave tackle-block. Fig. 2 is a front view of Fig. 1. Fig. 3 is an inside view of one of the cheekpieces. Fig. 4 is a vertical transverse section of Fig.' 1. Fig. 5 is a front view of a twosheave tackle-block. Fig. 6 is a side view of Fig. 5.

Like letters of reference refer to like parts in the several views.

The nature of this invention relates to certain improvements in metal tackle-blocks; and which consists in part of so constructing said blocks that the outer surface of the cheeks or shells thereof shall be free from projections, rendering them smooth and uniform in contour, thus avoiding chafing the ropes and rigging while in use The improvement also consists in so attaching the strap to the block that said strap can be readily removed for certain purposes hereinafter specified; and also in forming, on the inner surfaces of the cheeks, bosses for supporting the hub of the sheaves against lateral thrust. It also relates to the employment of certain peculiar division-plates, by which, in their connection with the checks or shell of a single sheave-block, the block is made into a two or more sheave-block, without changing the otherwise essential construction of the block, by which, together with certain other improvements,the tackle-block is rendered strong and durable, substantially in the manner as follows, which is a full and complete description of the allegedv improvement.

In the drawings, A and B represent the sides or cheeks of the blocks, which are concave on the inner, and convex on the outer, sides, of which Fig. 3 represents an inside view. (J are webs torstrengthening the cheeks, and U is a projecting boss on the inside of the shell, touching the hub of the sheave when in position, taking its side thrust or wear, thereby relieving the wear and friction at the outer edge of the sheave. This boss may vary in length of projection, to allow of various lengths of hubs or centers of sheaves. It also forms an increased bearing for the pin H. On the inner side of each upper end of the cheeks are formed projecting in tegral parts 1), Fig. 2. These parts may be seperate, and connected with the block between the checks for the same purpose, which form the parts of contact in putting the blocks together, and by a varied amount of projection form the different Widths of. space or mortise for various sizes or thickness of sheaves. Similar projections are on the lower end at E of the checks, or are substituted by beckets or thimbles, answering the like purpose, the division plate I, Fig. 5, having corresponding projections for similar purpose. From the top downward in the projectures D D, Fig. 2, is cast a mortise of a size to receive the ends of the strap F, whereby the ringG or hook is attached to the block. The ends of the strap are fitted in the mortises, and extend therein, as will be seen in Fig. 4. The strap is held by a pin or riveted rod, a, Fig. 4, and which also serves to secure the checks of the block to'each other at that end. The lower end of the checks of the blocks are in like manner secured to each other by one or more rivets, b b, Fig. 1, passing through the projectures E E, immediately beneath which, in the ears G, may be secured a becket.

It will be observed, on examination of the drawings, that the cheeks A B, and divisionplate I, Fig. 5, serve as the connecting-links between the straps, carrying the hook at one end of the block, and the becket at the other, supporting intermediately the burden on the sheave by the shaft H, entirely dispensing with straps extending along the outer or in ner sides of the cheeks for these purposes, as is usually the case. The shaft H is secured in place by pins 0d, one on either end, as shown in Fig. 4. Said pins are embedded in the cheeks so far as to be below or even with the surface. To accomplish this enda recess or gain, 0, is made in each cheek-piece for the reception of the pins. (See Fig. 4.)

In placing the shaftH in position, the pin 61 is first inserted in the shaft, then pushed by which it is secured from coming out.

through, and pin 0 bent and inserted, afterward having its ends setback in the recess, Ihe pin 0 may be removed by prying up one end and pushing itout, thus allowing the removal of the shaft, 860. In place of pin 0, held in position as described, it may be substituted by a split pin-key, which is similarly embedded in recesses to prevent chafing or wear. (See Fig. 6.) It sometimes occurs that, instead of a book being attached by the strap F, a ring or other device, or in some cases no substitute at all is wanted, as special uses may determine. Therefore, instead of riveting the pin a, securing the straps in the cheeks, it is retained therein by split key N, Fig. 6, which is alsoembeddcd in the cheek in a recess, so that it shall not be above the surface thereof hence, to effect the change of a hook for a ring, or for the removal of either, the split key is backed out, and'the pill A and strap are taken out to effect the desired change, thus making the strap removable. In such case the upper end of the block is secured or fastened together by rivets b b. Thetwo sheaveblocks, Figs. 5 and 6, are similar in construction, difi'ering therefrom chiefly by the addition thereto ot' the division-plate I inserted between the cheeks, creating two spaces for the accommodation of two sheaves,K and L. A three or four sheave block is made by the addition of similar division-plates to the plate I and sheaves, the replacing or placing of mortises for strap for book being the chief change required. So far as the side plates or cheeks A and B are concerned, and the method of forming mortises for the sheaves, and securing the several parts together, forming the' entire block, there is no substantial or material difl'erence between that shown in Figs. 1

and 2 and that represented in Figs. 5 and 6, the latterhaving in addition the division-plate I, of which there may be one or more, according to the number of sheaves required in the a block.

, above the surfaces-a block that shall be neat in appearance, strong, and durable, and yet light, so that it may be as readily handled as those made of wood.

What we claim as our inventiomandjdesire to secure by Letters Patent, is-

1. In tackle-blocks, the eheeksor side pieces A and B,.having proj ectures D D cast, or other wise formed thereon. forming of the projectures and shell one entire piece of metal, substantially as described, the same separately and in combination with the gains ormortises for'the strap F, for the purpose setforth.

2. In tackle-blocks, the cheeks or side pieces A and B, having projectures D D and E E cast or otherwise formed thereon, making of the projectnres and shell one entire piece of metal, and division -1.)1atc I, substantially as and for the purpose specified.

3. The division-plate I, having projectures I onone or both sides thereof, made or cast of one piece, in combination with the sides A and B, to form division between the sheaves in tackle-block, substantially as herein described. JOHN SIMPSON.

ALFRED A. POPE. Witnesses:

J. H. BURRIDGE, E. W. Gaoss.

Images