USRE7728E - Improvement in t - Google Patents

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Narren STATES Prvrnnfr Ormea i JGSEPH F. HARCOURT, 20F CINCINNATI, OHI.

IMPROVEMENT in T AcKiE-BLQGKS.

Specification -formiug part of Letters Batent No.17B,663, d-ated June 9,11868; Vreissue rim-17,128, dated June 12, 1377; application jiiled September 25. `1,876.

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Be Ait known .that vr1 JOSEPH F, HARCOURT, o f ``Cincinnath VIfiauiilton county, lState ot' Ohio, haveinvented acer-tain new Vand useful Improvement in She-ave or Tackle Blocks, of which the following ,is a specification My yinvention ,is an improvement in the glass o f ironstrapped :tackle-,blocks h aving ,two .or more sheaves.

Thisclssofblockssheretofore constructed, have been deficient vin strengthanddurability of the shell or. frame inw which are inserted the straps, sheaves, and pins, Said Shel-l ,or frame being the foundation proper of the block, protecting, as kit does, the sheaves from fracture .and the rope from being chafed or cut when ,in use, ,and resisting heavy Strains- Whu the ,partitions separating ,thesheave-s, as .heretoforeconstructem have been in three paltofequal thickness, two loffwoovd (one on side yof ,the middle strap) and the other .thestnap itself) of iron, the three combined orm the partition; and the straps are from three-eighths to one inch in thickness, and vary l-width according tostrength required; but the wood parts of the partition are no thicker than the strap of yiron yor middle part, and, therefore, are easily hrokenwhen subjected to rough usa ge, or, when under heavy strain, they come in contact with any immovableobject, resulting in fracture of the edges of the sheaves, cutting and chafing the rope, and often letting the weight suspended fall, thereby causing great damage and loss of time, as well as being unsafe and unreliable for heavy work. My improvement overcomes the deiiciency of strength, liability to breakage and accident, as the partitions separating the sheaves are of wood, of any desired thickness above that of the straps, and fitted with grooves for the reception and retention of the iron straps, sncient space of wood remaining beyond the thickness of strap for the passage of rivets to secure additional strength, and thus make a shell or frame that will withstand any usage that blocks are applied to, where, .in many instances, the partitions are required to' stand very heavy direct pressure, as well as Y. severe torsional strains.

My invention consists, first, in forming the -`partitions between the sheaves of combined iron strap and wood, the latter being grooved to receive the former, rso that, while ,great width ot' wood, and consequent stiffness, is given to ,the partitions, thenecessity Afor mortising the partitions to receive the straps is avoided; second, in making the grooves in the partitions for the straps, one on each side of said partitions, for the purpose of bringing the metallic -partoi' -the partition inl iminesdi, .ate proximity to the 'faces of the sheaves, to avoid the risk of the bending of -the axle or pin in use; third, in making each partition not only with grooves at Vthe side faces thereof, but With `one piece ot' wood, unbroken or uncut from side to side, lso that the partition has great rigidity and strength; fourth, in forming the Veye of the b lock into twoseparated straps, which so enter vthe partition as to'leave a thickness of wood between them, and occupya-position in close contact with the side faces of the sheave-wheels, to avoid adding weight of metal to secure thick partitions.

Figure 1 .is a Vpar{dy-sectioned front elevation of a triple sheave-block embodying my improvements. Fig. 2 is a similar View of a ldouble sheave-,block. Fig. 3 is a, ,partly-sectioned side .elevation ,of my improved block for two or more sheaves. Fig. 4 is a crosssection of one of the partitions detached.

The wooden portion of my framework or` block proper consists of the lusual number of cheek's or .sides A, partitions C, and end pieces B. The straps D D' are broad in the direction parallel with the faces .of the sheaves E, and thin in the plane of the pin or axle F, and are let into groovesG G. This provision of grooves in the partitions enables the par titions to be-made as much thicker than the strap as is necessary or desirable, without having to resort to the process of mortising, so

that while I am enabled to avoid the objectionable manufacture of blocks in which the partitions are of the same thickness asv the strap, and possessing no grooves to receive and sustain the straps, I do not have to make the receptacles for the straps by the expensive and difficult operation of mortisng. I prefer that the wood of which the partitions are formed shall be in one piece from side to side, for the purpose of giving them great rigidity,

and I therefore make the grooves G G in the sides of the partitions; and this location also gives another advantage in construction. It brings the faces of the straps against the faces of the sheaves, leaving no wood between, which might yield and allow the pin to be bent or broken in use. The eye H for the insertion of the hook or cordage lashing is preferably bent into two of the straps D', as at Fig. 2, or bent and forked, as at I, Fig. 1, into two on each side, and in either case entering the grooves, so as to leave wood between them, and thus give metallic bearing' surfaces for the pin of the sheaves of lgreat width apart. The middle or inside strap for a two-sheave block is formed with'an eye for the reception of the hook or ring, also for the reception of the outside strap. The inner strap is clinched over the outer strap, the straps thus combined forming a' complete strap for a two-sheave block, the whole being inserted in the shell in the manner described and shown. The ends of the middle or inside strap pass through the grooves G G in the partitions, where'they make a part of th'e same, and occupy a position ush with the face of the wood partition, in close proximity to the faces of the sheaves, giving effectual support to the pin which passes through `the straps and sheaves, upon which (the support of the pin) depends the safety and success of this class of blocks. The middle or inside strap for a three-sheave block is formed with an eye by uniting two pieces of iron of the proper size a suicient length to form said eye for hook or ring, also for the reception of the outside strap, the straps thus combined, as shown,`forming a complete strap device for a three-sheave block, the whole being inserted in the shell, the ends of the middle or inside strap passing through the grooves in the partitions making a part of them, as described for a two-sheave block. The main rivets J l pass from side to side entirely through the cheeks,partitions, and end pieces, but are not, as in other inside strap-blocks, the only means of junction of these parts, when each partition, as well as cheek, is in one unbroken piece; and, furthermore, the partitions, being so much wider than the metal of the straps, are susceptible of being secured b v cross or counter rivets L, which may be passed entirely through each cheek and partition, from edge to edge, without interfering with the straps. The central strap may, when required, be extended down, as at M, for the attachment of a becket, N.

I claim herein as new and of my inventionl. An inside iron strapblock constructed with a Wooden partition, in which the intermediate metal strapping is embedded, the thickness of the wooden partition being in excess of the thickness of the said metal strapping, substantially as and for theV pu'ipose specified. f l

2. In a two or more sheave block, the partitions U, provided with grooves G G in the sides, the depth of the grooves being at least equal to the thickness of the strap, but not extending entirely through the partition, substantially as specified,

3. In a two -or more sheave block, the partitions C, extending in one piece from side to side of the block., and provided with grooves G G' in the sides, the depth of the grooves being at least equal to the thickness of the strap, but not extending entirely through the partition, substantially as specified.

4. rEhe eye H, ending in forks'or straps D',

separated in passing through the partitions, substantially as and for the purpose specified.

In testimony of which invention I hereunto set my hand.

.JOSEPH F. HARcoURT. Witnesses:

JonN E. JONES,

F. MILLWARD.

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