US484038A - Fourths to - Google Patents

Description

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No. 484,038. Patented Oct. 11, 1892.

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J. R. MORGAN. CHAIN BLOCK.

No. 484,038. Patented Oct. 11', 1892.

m lilIl-v mm 75519120., mam-mam, wAsnmumu u c UNITED STATES PATENT OFFIcE.

JOHN R. MORGAN, OF ALLIANCE, OHIO, ASSIGNOR OF THREE-FOURTHS TO THOMAS R. MORGAN, SR, MORGAN, OF SAME PLACE.

THOMAS R. MORGAN, JR., AND WILLIAM H.

CHAIN-B LOC K.

SPECIFICATION forming part of Letters Patent No. 484,038, dated October 11, 1892. Application filed June 29, 1891. Serial No. 397,947. Nomodel.)

To all whom it may concern: moved up to and in contact with, if necessary,

Be it known that I, JOHN R. MORGAN, of Althe upper block. F a.

liance, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Chain -'Blocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. to My invention relates to an improvement in chain-blocks designed more particularlyfor use on overhead traveling cranes. In traveling cranes and, in fact, all hoisting machinery designed for lifting heavy weights 5 an upper block swiveled to the crane or derrick or other support and a lower movable block carried by the hoisting-chains are em-' ployed. The number of sheaves ineach block varies according to the weights to be 2o lifted; but in any event each block carries a series of sheaves on immovable bearings. In traveling cranes each end of the chain is made fast to a winding-drum and then passes downwardly to the outer sheaves on the lower block, then over the outer sheaves of the upper block, and thence over the intermediate sheaves in the same order. Of course it is understood that the chain must be rove through the sheaves before it is made fast. 0 There is one more sheave on the lower block than on the upper, and when the blocks are rove, as stated, the sheaves on the upper block rest in planes passing between the sheaves on'the lower blocks. Thus it will be seen that the chains necessarily cross or pass at an angle from the sheaves on the upper block to the sheaves on the lower block, and as the angle increases as the blocks ap proach each other and as the sheaves are 40 necessarily widely separated it follows that as the blocks approach each other there is-a tendency of the chains to ride out of the grooves in the sheaves, which greatly increases the friction and absolutely prevents the lower block from being raised to the upper block.

The object of thepresent invention is to provide means for maintaining the chains vertical, thereby avoiding all increase in friction and permitting the lower block to be the hubs h of the shanks 2'.

With this object in view my invention consists in the parts and combinations of parts, as will be more fully described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in end elevation of the two blocks with the chains therein. Fig. 2 is a view in front elevation of same, and Fig. 3 is a view in elevation of the old form of block.

A represents the upper block, and B the lower block. vThe upper block consists of a head C, composed of two parts a b, securely bolted together at their ends and at points :between the sheave shanks or spindles. The

head thus formed is provided centrally with a stem or pivot D, clearly shown in Fig. 1,

which latter is provided with anenlarged head 0, which rests on the seat d, carried on and supported by the girders E. The sheaves e, e, 6 and e are supported on bearings secured to the lower ends of hangers f, which latter are supported on and secured at their upper ends to pivots g, which pass through The shanks 1 of the spindlessupportin sheaves e, e, 6 and e are each provided with an enlarged head, which rest on seats formed on the two sections a b of the head C. The central sheave e is supported on hangers f, similar to the hangers supporting the other sheaves; but the hangers, instead of being secured to a swiveled support or spindle, are in the present instance secured to a projection i rigidly secured to the head. It is evident, however, that this central sheave can be mounted on a movable or adjustable spindle, like the others, or all of the spindles or supports might be rigid, the sheaves, however, occupying positions substantially as shown in Fig. 2. The lower block is provided with a series of inde pendent sheaves mounted on a rigid axle or hearing common to all and is provided with a depending ring or hook, to which the ob- 5 ject to be elevated is attached.

By examining Fig. 3 of the drawings it will be seen that the chains instead of passing in vertical lines from the upper to the lower sheaves, pass at an angle, or, in other words, roe

' chains ride against the side walls of the groove and cause friction sufficient to prevent the blocks, when weighted, from approaching closer than six or eight feet.

With my invention I mount the sheaves on adjustable bearings, so that they can assume automatically the positions shown; or, if desirable, I can adjust them to the position shown and lock them. With the sheaves turned so that one vertical edge of each is approximately over one sheave in the lower block and the opposite vertical edge or side over the next sheave on the lower block the chains in passing from the upper to the lower sheaves are in vertical planes, and hence there is no friction against the sides of the sheaves, no tendency whatever for the chains to ride oh. the sheaves, and no opposition whatever to the blocks being drawn up into contact.

By this improvement a gain of from six to eight feet in the lift is secured, which enables me to employ the device in places where the old apparatus could not be used and also enables me to lower the structure on which the traveling crane moves a distance equal to the space gained in the upward movement of the lower block.

It is evident that numerous slight changes in the construction and relative arrangement of parts can be made without departing from the spirit of my invention. Hence I would have it understood that I do not confine myself to the exact construction shown and described,but consider myself atliberty to make such changes and alterations as fairly fall within the spirit and scope of my invention. i

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a hoisting-tackle, a lower block having a series of sheaves and an upper block having a series of independent sheaves, each of the latter being carried by an adjustable bearing or spindle, substantially as set forth.

2. The combination, with a lower block having a series of independently-revoluble sheaves, of an upper block having a series of adjustable sheaves arranged, substantially as shown, with relation to its block and to the sheaves of the lower block.

3. The combination, with a lower block having a series of independently-revoluble sheaves mountedon a common axis, of an upper block havinga series of independently-adjustable sheaves,each mounted on an independent axis.

4. The combination, with a lower block having a series of independently-revoluble sheaves, of an upper block having a series of sheaves mounted independent of each other, the devices supporting the sheaves being movably secured in the block, substantially as set forth.

5. The combination, with a lower block sheaves, of an upper block, a series of independent sheave-supporting devices, and a sheave for each sheave-supporting device, the

said sheaves adapted to revolve on horizontal axes and the said sheave-supporting devices having a movement on vertical axes, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscrib- 3 ing witnesses.

JOHN R. MORGAN.

Witnesses: I

THOMAS E. MORGAN, Six, FRANK E. DUSSEL.

having a series of independently-revoluble v

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