US138215A - Improvement in derricks - Google Patents

Description

JOHN E. WALSH, OF NEW YORK, N. Y.

IMPRVEMENT IN DERRlcKs.

Specification forming part of Letters Patent No.`138,2l5, dated April 22, 1873; application filed March '7, 1873.

To all whom it may concern: I g

Be it known that I, JOHN E. WALSH, of the city, county, and -State of New York, have made certain Improvements in Derricks, of which the following is a specification:

The invention relates to derricks used in hoisting freight from the hold of a vessel, or lowering such freight into the hold; and it consists in the construction and arrangement of the parts which make the derrick a more perfect device, as will be fully hereinafterdescribed.

In the drawing, Figure 1 represents the front view of the derrick; Fig. 2, a plan or top view; and Fig. 3, enlarged details of some of the parts.

A represents an upright movable mast secured in the step a, which is made fast to any permanent and convenient floor, platform, or vessels deck by means of screw-bolts or their equivalents, so that the step ci and mast A can be readily removed, as may be desired. A is a removable swinging cap, formed by the two horizontal beams and two uprights, a a', at their extremities. These uprights a are made fast to the horizontal 'beams by going through the ends thereof. The whole cap can be removed from the mast at will. The cap A thus formed has center holes in the horizontal beams, which receive the upper end of the mast, and can freely revolve thereon. The cap A is supported and strengthened by thimbles a" and a. Thimble a is fast upon the under side of the upper horizontal beam, and embraces the upper end of the mast A, and rests upon a shoulder on said mast, while thimble a" is free to revolve around mast A at a distance below the lower horizontal beams, and bears upon a permanent thimble,a5, fast on the mast A. a4 a4 are braces secured to opposite sides of a thimble, af", and extend upward and outward to the under side of the lower horizontal beam near its outward ends, where they are permanently secured thereto, giving strength to resist lateral strain. B B are swinging arms or booms that at their inner ends are pivoted to and turn around the upright pieces a of the cap A. Arms B have vertical slots b, as seen in Fig. 3, to carry travcling blocks therein, and are supported by bracerods b b' b', which go from the arms to a revolving thimble or eye, b, on the upper ends of the uprights a of the cap A', and are capable of sustaining any load put upon the swinging arms or booms. The vertical slots b in the swinging arms B are wider on their upper sides than on the lower, in order to form ledges or tracks 1 to support the friction-wheels 2 of the traveling blocks C, in which the hoisting-rope works whenin operation. Only two swinging arms carrying traveling blocks are shown; but it is evident that, when necessary,

`two more can be added by duplicating the horizontal beams and uprights in the cap A, and forming them into a single cap or revolving head, to which two more arms can be attached. O O are the traveling blocks, containing sheaves c c and friction-wheels 2 2 on their outer sides to bearupon the ledges or trucks 1 of the slot b in arms B, and are capable of travelin g horizontally the whole length of the slots in the arm B, as occasion may require, to accommodate the position of the weight to be raised, or where the weight shall be deposited. l) D are windlasses for winding the hoistingrope upon, and have Winches d d to operate the same; when worked by hand are fast in strong frames d that are immovable; and to the shaft of each windlass is a ratchet or toothed wheel, d, that is held from unwinding by the drop-pawls LZ. E E are hoistingropes around the winding-cylinder of the windlass; thence over one of the pulleys e e near the inner ends of the swinging arms B; thence horizontally over and around one of the pulleys c in traveling'block C thence downward to hoisting-block F and around a sheave therein; thence up and around another pulley, c, in the traveling block C; then down around another sheave in hoisting-block F then up, and the end secured to an eye in the under side of the traveling block G. Gr G are windlasses made fast to a platform or iioor, and are similar in construction to windlasses D, and are used for regulating the traveling blocks C to be at the proper horizontal distance from the mast A by means of the rope g winding around the cylinder of 4windlass G; thence upward over one of the pulleys e at the inner end of slot b in the swinging arm B; thence horizontally over pulley g' at the outer end of the swinging arm B; then down. and attached to UNITED STATES PATENT OEEIGE.

an eye on the outer end of the traveling block (y), by which arrangement the traveling block and its weight are made to be at any desiredl distance from the mast or from the end of the swinging arm. In order to properly brace the derrick and keep it from swaying under the weight to be raised, guys h are made fast to the ends of the top horizontal beam of the cap A', and strained tight around cleats h on the platform, and when the cap A is to be turned on the mast these guys are used for the purpose, and when the cap is in the right position the guys are fastened by the cleats to hold it in such position. h h are guy-ropes attached to the outer ends ofthe swinging arms B, and by which the arms B are swung around to any desired position, when the guys h are made fast to cleats h h", when the position of the arm is secured.

By this construction of the revolving cap and swinging arms in a derrick great convenience is had over the ordinary derrick in raising or lowering the weight W in a perpendicular direction, be the position ofthe weight W what it may, if in reach of the swinging arm, which does awaywith the immense friction that is had when the weight being raised or lowered is moved horizontally in contact with the ground or floor on which it rests.

It is obvious that other power than manual or hand can be applied to the windlass to operate the raising or lowering of the weights or packages being handled. A

Having thus described my invention, what I claim, and wish tovseeure by Letters Patent, 1S

1. In a hoisting-derrick, the removable revolvin g cap or head A', when constructed and operating upon the mast A in the manner substantially as described and shown.

2. In a hoisting-derrick, the swinging arms B, in combination with the revolving cap A and mast A, constructed to operate in the manner substantially as described.

3. The swinging arm B, having slot b with ledges or tracks l therein, substantially as and for the purposes described.

4. The combination of the hoisting-block C, having sheaves c c and friction-rollers 2, with the swinging arm B, having the slot b and ledges or tracks 1 therein, substantially as and for the purposes described.

5. The combination of the windlass D, hoisting-rope E, pulley e, and traveling block C with the swinging arm B, in the manner substantiallyT as described.

6. The combination of the windlass G, rope g, pulleys e and g with the traveling block C and swinging arm B, substantially as and for -the purpose specied.

7. The combination of the swinging arm'B that carries the traveling hoisting-block C with the guy-ropes la h Vand cleats h" hf, substantially as and for the purpose described.

JOHN E. WALSH.

Witnesses:

GEORGE S. McKAY, HENRY W. RAYMOND.

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