US375665A - Crane - Google Patents

Description

(No Model.) 2 Sheets- Sheet 1 Y J. S. WORTH.

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UNITED STATES PATENT OFFIcE.

JOHN S. WORTH, OF CCATESVILLE, PENNSYLVANIA.

CRANE.

SPECIFICATION forming part of Letters Patent No. 375,665, dated December 27, 1887.

Application filed May 12, 1887. Serial No. 237,924. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN S. WORTH, a citizen of the United States, and a resident of Coatesville, Chester county, Pennsylvania, have invented certain Improvements in Cranes and Hoists, of which the following is a specification.

My invention relates to cranes in which the winch, steam or hydraulic cylinder, or other hoisting appliance is stationary, in contradistinct-ion to thosein which the hoisting device travels on the jib of the crane, the object of my invention being to so construct such a crane that the load may be readily traversed from and toward the post of the crane without any change in the vertical position of said load. This object I attain in the manner which I will now proceed to describe, reference being had to the accompanying drawings, in which- Figure l is a side view of a crane having hoisting mechanism constructed in accordance with my invention. Fig. 2 is a plan view of the crane, and Figs. 3 to 6 are diagrams illustrating other forms of crane or hoist embodying my invention.

Cranes in which the hoisting device is mounted upon and traversed to and fro on the jib of the crane are objectionable, because the weight of such hoisting device interferes with the free traverse of the same to and fro on the jib, and where the hoisting device is a steamcylinder traveling on the jib there is the further objection that flexible tubing must be employed to convey the steam to said cylinder, which tubing is rapidly destroyed and must be frequently replaced.

In carrying out my invention, therefore, I discard the idea of mounting the hoisting device on the jib so that it is movable to and fro thereon, and I use a fixed hoisting device in connection with a peculiar system of carrierpulleys, whereby the load may be moved to or from the post of the crane without any change in its vertical position.

As shown in Fig. 1, A represents the vertical post of the crane, which is provided at top and bottom with pivots intended to be adapted to any available sockets, so that the post is free to swing on its axis.

The projecting jib of the crane comprises in the present instance opposite side beams, B, securely bolted to the vertical post A and stiffened by appropriate braces, D. To a suit-- able bearing on the post A is adapted the shaft of a winch, a, on which is wound the hoistingrope a, said rope passing over a series of carrier-pulleys, b, d, and f, and being provided at its outer pendent end with any suitable means for attaching thereto the object to be lifted. The shaft of the pulley b is adapted to fixed bearings c on the jib of the crane, and said shaft is connected by arms 9 to the shaft of the intermediate pulley, (7,, which latter shaft is connected by arms h to the shaft of the outer pulley, f, the latter being provided with wheels i, adapted to suitable tracks on the beams B, forming thejib of the crane. By this arrangement the outer pulley,f, may be moved freely from and toward the inner pulley, b, without slackening or drawing upon that portion of the rope between the pulleys b and f, for as the pulleyf is moved inward the pulley d rises to take up any slack which might otherwise be formed, and as the pulleyf is drawn outward the pulley d descends to deliver the slack which it took up on its rise, no change in the vertical position of the weight resulting from the moving of the same in or out. The weight of the load being exerted with equal force upon the pulleys I), (Z, andf has no tend ency to depress the central pulley, and the weight of the latter and of the armsg and h is counterbalanced by means of a weighted arm, m, secured to the shaft of the pulley b.

In Fig. 3 I have shown my invention applied to a crane in which asteam or hydraulic cylinder, a, takes the place of the winch shown in Fig. l, the pivots of the post A in this case being hollow for the reception of the steam and exhaust pipes. In this case, also, the shaft of the pulley b is adapted to bearings c beneath the jib of the crane, instead of above the same, as in Fig.1, the army being lengthened to correspond with this change in the position of the pulley. This construction provides for greater range of movement than that shown in Fig. 1. \Vhere an extreme range of movement is required, however, the system of carrier-pulleys and connecting-arms may be multiplied, as shown in Fig. 4, for instance, in which there are two sets of carrier-pulleys, b, d, and f and b, d, and f, and two sets of connecting-arms, 9 hand 9 h. The adjacent ends of the arms h and g in this construction are connected by a frame, a, whereby they are always maintained in the same relation to each other, and this frame carries an idler-pulley, p, intermediate of the pulleys f and b, the rope passing beneath this intermediate pulley. The arms h and 9 may be connected by intermediate pivoted arms, 8, so as to cause them to move in unison, but this is not absolutely essential. I

A minor advantage of my invention is that the outer carrier-pulley can be projected to the extreme end of the jib of the crane, so that the hoisting rope or chain hangs down beyond the end of said jib, whereby the weight can be readily transferred from said rope or chain to that of an adjoining crane.

Although I have shown the hoisting device as carried by the vertical post of the crane, this is not essential to my invention. For instance, the pulley may be replaced by a hoisting-drum, as shown by dotted lines in Fig. 3, said drum being operated by a small engine, or having power otherwise suitably applied thereto. .Hence in every case in which such drum can be used in place of the inner pulley I consider it the equivalent of the latter an claim it at such.

Besides the advantage of ready manipulation possessed by my improved crane as compared with those having the hoisting devices movable on the jib, said improved crane is of cheaper construction, the parts being of the simplest character, and no expensive fitting being required.

The power of the hoisting device may, as in an ordinary crane, be increased by the use of a double rope looped for the reception of a pulley to which the load is suspended, double pulleys d and f being used in this case, and one of the inner ends of the rope passing round and being secured adjacent to the pulley or drum 1;, while the other of said inner ends is connected to the hoisting device.

My improved arrangement of carrier-pulleys can be used on a fixed or traveling beam or girder in a mill or other structure, as well as on the jib of a swinging crane, as will be readily understood. In Fig. 5, for instance, I have illustrated a special form of hoist embodying my invention. In this case there is asecoudary longitudinal supporting-beam, B, parallel with the beams B, and a third transverse supporting-structure, B secured at one end to a wheeled frame, a, running on the beam B, and at the opposite end to a Wheeled frame, a, running on the beams B. There are two sets of pulleys, b df and b df, two sets ofarms, g h and g h, and an intermediate idlerpulley, 1), carried by the frame a, as in Fig. 4; but the second set of arms and pulleys are at right angles to the first, the outer pulley, f, traversing the transverse-supporting-structure B and the pulley f traversing the longitudinal beams B. By means of this structure the load can be handled at any point Within the area of a quadrangle of which the beams B B are the opposite sides, the rope being op-.

erated by a stationary engine or other suitable motor located at or.

In Fig. 6 I have shown a multiple arrangement of pulleys of a simpler character than that shown in Fig. 4, a single pulley located beneath the beam replacing the movable frame with its three pulleys shown in the latter figure.

I claim as my invention- 1. The combination of the supporting-beam and hoisting rope or chain of a crane or hoist with an inner pulley, an outer pulley, an intermediate pulley, and arms connecting the shafts of said pulleys, whereby as the outer pulley is moved toward or from the inner pulley the intermediate pulley is caused to rise or fall, all substantially as specified.

2. The combination of the supporting-beam and the hoisting rope or chain, inner, outer, and intermediate pulleys, arms connecting the shafts of the same, and a weighted counterbalancearm, all substantially as specified.

3. The combination of the supporting-beam and the hoisting rope or chain, an inner pulley, an outer pulley, a series of intermediate pulleys, and arms connecting the shafts of the pulleys, all substantially as specified.

4. The combination of the supporting-beam and the hoisting rope or chain, an inner pulley, an outer pulley, a series of intermediate pulleys, a movable frame carrying the central pulleys of said series, and arms connecting the shafts of the various pulleys, all substantially as specified.

5. The combination of the supporting-structure of a craneor hoist, comprising fixed longitudinal beams and a movable transverse beam, a hoisting rope or chain, and two sets of carrier-pulleys, one mounted on one of the longitudinal beams and the other on the transverse beam, and each set comprising an inner, an outer, and an intermediate pulley, and arms connecting the shafts of said pulleys, all substantially as specified.

6. The combination of the post and jib of a crane, the hoisting rope or chain, inner,

outer, and intermediate pulleys carried by the jib, arms connecting the shafts of said pulleys, and a hoisting appliance carried by the fixed frame-work of the crane, all substantially as specified.

7. The combination of the pivoted post of the crane and its jib, the hoisting rope or chain, inner, outer, and intermediate pulleys carried by the jib, arms connecting the shafts of said pulleys, and a hoisting cylinder or engine carried by the fixed frame-work of the crane and receiving its supply of motive fluid through a hollow pivot of said post, all substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two sub scribing witnesses.

JOHN S. WORTH. \Vitnesses:

N. H. STONE, J OHN JOHNSTON.

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