US1149837A - Sheave-block. - Google Patents

Description

C. B. KING I C. B. WESTON.

SHE'AVE BLOCK.

APPLICATION FILED SEPT. I9. I9II.

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CHARLES B. KING AND CLARENCE B. WESTON, OF MARION, OHIO, ASSIG-NORS TO THEl MARION STEAM SI-IOVEL COMPANY, OF MARION, OHIO, A CORPORATION OF OHIO.

SHEAVE-BLOCK.

Specification of Letters Patent.

Patented Aug.. 10, 1915.

Application filed September 19, 1911. Serial No. 650,207.

dipper type, although applicable to other..

uses.

The object of the invention is to Provide a sheave block which will be of a very strong, durable construction and will not be injured or the joints thereof loosened by the hammering which it necessarily receives when in service.

To this end it is a further object of the invention to provide a sheave block consisting of two cast metal side pieces which are rigidly connected one to the other and which support the sheave between them.

It is a further object of the invention to provide means for retaining the cable in proper relation to the sheave and for spac-r .ing apart and reinforcing the side members;

and it is also an object of the invention to provide guards for the sheave which will prevent the same being injured or the cables being twisted or displaced when the sheave is drawn close to the point of the boom.

In the accompanying drawings, Figure 1 is a side elevation, partiallv broken away, of thehpoint of a boom showing our improved sheave block connected therewith; Fig. 2 is a section, taken on the lline m a' of Fig. 1; Fig. 3 is a detail view of a portion ofthe sheave block showing the same partially in elevation and partially in section; and Fig. 4 is an edge View of the lower portion of the block.

In these drawings we have illustrated one embodiment of our invention and have shown the sheave block as comprising two side members 1, each of which consists of but a single piece of metal and is preferably formed by casting. These side members may be of any suitable shape and are here shown as comprising a. body portion substantially circular in shape and of a diameter slightly greater than the diameter of the sheave which is to be supported between thetwo side members. This sheave, which 1s indicated at-2, is journaled on a shaft 3 which is mounted at its ends in the respective side members and preferably has its ends squared to hold the same against rotation. The two side members of the block are spaced apart and rigidly connected one' to the other.

In the present instance each side member is provided on the lower portion ythereof with two inwardly extending flanges 4, the flanges on the two side members being arranged directly opposite one another and adapted to abut when the side members are connected one to the other. This connection is preferablv formed by means of bolts 5 which extend through the two side members and rigidly connect the same together. In addition to forming spaces to maintain the two side members of the block in their proper relative positions, these inwardly extending anges constitute cable guards and serve to prevent the cable from dropping away from the sheave. The

upper portions of the side members are connected together by means of "a bolt or pin 6 which extends through both of said members and is rigidly connected thereto. This bolt also constitutes the means by which the hoisting cable 7 is connected with the sheave block. To this end the pin 6 -has mounted .thereon a clevis 8 to which the end of the cable is connected. A. short sleeve 9 mounted on the pin 6 holds the cable near one of the side members 1 for a purpose which will hereinafter appear. The thickness of the sheave is, in the present instance, somewhat less than the space between the inner walls of the side members of the block, and, to

prevent the cable from dropping between the sheave and the side members each mem-k stance, is the excavating dipper. As here shown this means comprises a p1n 11 mounted at its ends in the respective side members 1 and having connected therewith a clevis 12 which, in turn, is connected with the bail of the dipper which is shown at 13 in Fig. 1.

The

When the sheave block is employed in connection with a boom and dipper excavating machine it is supported from the outer end of the boom, which is indicated at 14 in Figs. 1 and 2. To this end the point of the boom is provided with twin sheaves 15 mounted on a shaft 16 which, in turn, is mounted in bearing brackets carried by the outer ends or points of the two members constituting the boom.

In the operation of the mechanism the sheave block is not infrequently drawn up against the twin sheaves on the boom. This is liable not only to cause the disarrangement of the cables by twisting or otherwise but also is liable to injure the sheaves. To prevent such injury we have provided each side member of the sheave block with a guard portion, which is here indicated by the reference numeral 17, and which extends some distance beyond the adjacent portion of the sheave, and is adapted to engage a part or parts carried by the boomto maintain the sheave block and the sheave in proper relations to the twin sheaves on the boom and to prevent the sheaves from coming in contact one' with the other. In the present construction the boom is provided with two guard wheels 18 which are loosely mounted on the shaft 16 between the sheaves and the respective members of the boom and are adapted to be engaged by the guard pontions of the corresponding side members of the sheave block.- In order that the contact between these parts may be more certain the guard portions of the block are preferably provided with ianges 19 which form wide contact surfaces. These flanges are, in the present instance, extendeddownwardly and across the body portions of the side members, as indicated at 20, and constitute reinforcing ribs which. add materially to the strength of the side members of the block. With this construction when the sheave block is drawn close to theboom point the guard portions of the sheaveblocks will engage the guard wheels on the boom and the sheave blocks will move about the axes of guard wheels until they reach the limit of their movement. The clevis by. means of which the end of the cable is connected to the end of the sheave block being arranged close to one side of the sheave block and the sheave of the sheave block being maintained in its proper relation to vthe sheaves on the boom point, it will be obvious that there can be no twisting of the cable or any displacement thereof.

The boom points which support the shaft 16 are subjected to severe strain in the normal operation of the excavating mechanism, and, in order to reinforce the ends of the wooden boom members and impart to the same the necessary strength it has been customary to round ofi' the points of these members and bend either the top or bottom' guard plate about this rounded portion of the boom. This construction involves considerable labor and is, therefore, expensive and is open to other objections. In order to overcome these objections we have provided the points of the boom members with bearing blocks 21 of such a size and shape as to form continuations of the boom members. These bearing blocks are mounted between the armor plates 22 and the top and bottom plates 23 and 24, and, when bolted in position, form a very strong durable support for the shaft 16 and the hoisting mechanism which is carried thereby.

The operation of the device has been fully explained in connection with the description of the several parts thereof and it will be apparent that we have provided a very strong and durable sheave block which is simple in its construction and can be manufactured at a relatively low cost; that this sheave block is of such a character that it is not liable to injury by the severe hammering which it receives` when in use, this being' largely due tothe one-piece construction of the side members thereof which eliminates all joints in these members. It will also be apparent that the block is of such a character that they cable will be maintained in proper relation to the sheave; and further, that the sheave will not be injured nor the cable twisted when the sheave block is drawn close to the boom.

While we have shown and described the several features of the invention as embodied in a sheave block comprising two cast metalside members it will be obvious that many of these features are applicable to built-up sheave blocks or to sheave blocks of constructions other than that here shawn. e Further, we wish it to be understood that we do not desire to be limited to the details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is:-

1. A sheave block comprising two side l' members and means to support a sheave between said side members, each side member having reinforcements extending vertically across the same and proj ecting below the body portion thereof to form a support fora work attaching device, each member also having inwardly extending flanges arranged along the lower edge thereof'on opposite sides of said reinforced portion, the flanges of the two side members being adapted to abut and serving both to space the side members apart and to form cable guards, and means to rigidly connect said side members one to the other with said flanges in their abutting positions.

:r hilvingba projection arranged in ent with and adapted to engage the ery of the respective guard wheels, a pported by said projections, a cable Carried by said pin and arranged bethe projections, and a sleeve on the tween the olevis and one of the pro- `s to retain said clevis adjacent the of said projections. estimony whereof, we affix our signan presence of two witnesses.

CHARLES B. KING. CLARENCE B. VESTON.

nesses: H. H. CONNOLLY, C. W. WRIGHT.

nig inwardly' extending airutfiiinges"of a diameter corresponding substantially to the diameter of said sheave and terminating adjacent to the edge of said sheave.

el. A sheave block comprising side members spaced apart and rigidly connected one to the other, each of said side members having a guard extending substantially radially therefrom, said block having means to conneet a cable thereto at a point below the upper ends of said guards.

5. The combination, with a boom, a sheave Vrotatably supported thereon, and guard members mounted on the opposite sides of said sheave, of a sheave block comprising side members having guard portions arranged in alinement with and adapted to membe alinem periph pin su clevis tween pin be jection other 1 In t tures i Wit;

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