US678188A - Hoisting-crane. - Google Patents

Description

No. emma. Patented my .9, |9ol. J.' MACBETH. Holsma cRANE.v

' (Application ledJuly 21, 1900.) 4 (N0 Modem 3 Sheets-Sheet I.

772/1521655 es m @Mlgvzerzw' c?? C? Z066 Ey WMM F 'F @Sgh/VK; mt/LA l vwaejq Nn. 678,I88. Ptented July 9, |901.

J. MACBETH. K HOISTING CRANE.

. (Application led July 21, 1900.; Y (No Model.) 3 Sheets-sheet 2.

m: Norms rzns ou, moro-urne.. wAsHmnwN u c no. s7a,|sa. Patented my s, |901.

J. MAcBETH.

HUISTING CRANE. (Application md .my 21, 1.900.) (No Model.) 3 Sheets-Sheet 3.

.tion in line 2 2, Fig. 3.

rricfn.

i ATENT JAMES MAOBETH, OF BUFFALO, NEW YORK.

HOISTING-CRANE.

SPECIFICATION forming part of Letters Patent No. 678,188, dated July 9, 1901.

Application filed July 21, 1900. Serial No. 24,410. (No model.)

T0 all whom, t may concern:

Beit known that I, JAMES MAOBETH, a citizen of the United States, residing at Buffalo, in the county of Erieand State of New York, have invented new and useful Improvements in Hoisting-Oranes, of which the following is a specification.

This invention relates to that class of cranes in which the jib or boom can be swung or partly rotated about a mast or pillar and in which the movement is effected by a power mechanism.

The object of my invention is to provide a power mechanism for swinging the jib or boom which is simple, compact, and efficient and which affords a comparatively large range of rotary movement.

In the accompanying drawings, consisting of three sheets, Figure l is an elevation of my improved crane. Fig. 2 is a vertical sec- Fig. 3 is a horizontal section in line 3 3, Fig. l. Fig. 4: is atop plan view of the jib or boom and the hoisting mechanism mounted thereon. Fig. 5 is a vertical section, on an enlarged scale, inline 5 5, Fig. 3. Fig. 6 is a vertical crosssection, on an enlarged scale, of the rack-bar and guide in line 6 6, Fig. 3. Fig. 7 is a detached sectional View of the four-way cock which controls the admission of the actuating fluid to the cylin- A der of the hoisting mechanism. Fig. 8 is a top plan View illustrating a modied construction of the boom-rotating mechanism.

Like letters of reference refer to like parts in the several figures. -1

A represents the mast or pillar, which in the embodiment of the invention illustrated in the drawings is a stationary structure and is firmly anchored in the ground by a suitable foundation-frame A. erably composed ofa lower portion a, of wood,

. and a tubular upper portion d', made of plate iron or steel.

B is a fixed platform which surrounds the mast abouton a level with the surface ofthe ground and which is constructed of timbers or other suitable material.

C represents a rotary platform or turn-table which surrounds the base of the mast and which is rotatably mounted upon the stationary platform B. A convenient way of supporting the rotary platform is by flanged roll- This mast is preff ers OQ which run upon a circular track c on the stationary platform and upon which the rotary platform runs by a circular track c', secured to the under side of the rotary platform. The rollers O are mounted in a circular frame c2.

D 'represents the boom or j ib, which is mounted in an inclined position on the top of the lmast A. E represents the cylinder of the hoisting mechanism, which is mounted upon the lower portion of the boom on one side of the mast. This cylinder is provided with a piston e and a piston-rod c', which latter is connected by a pulley c2 with the hoist ing-cable e3. The latter is secured to an eye c4 at the upper end of the boom and runs downwardly from this eye t0 the pulley e2 and thence upwardly and over a pulley c5 at the head of the boom. The piston isv actuated by any suitable fluid under pressure, compressed air bein g preferred. Any other style of hoisting mechanism may, however, be mounted on the boom, if preferred.

,The boom is preferably composed of two side bars or beams cl of I shape, which are connected by suitable cross-pieces and stidened by truss-rods d.

F is a head which is secured to the boom, at or near the middle thereof, by atransverse pinf orother suitable means 'and by which the boom turns upon the mast. This head is provided on its under side with a downwardlyprojecting journal fl, which enters a socket g in a cap-piece G, secured to the top of the mast. The head F and the cap-piece G are provided with overlapping marginal iianges, forming a channel which contains antifriction-balls g,' by which the head F is supported on the cap-piece G.

The boom is rigidly secured by any suitable means to the rotary platform C, so as to turn therewith, preferably by crossed braces h h', connecting the upper and lower ends of the boom, respectively, with-the platform.

The mechanism by which the rotary platform and the boom carried thereby are rotated or swungabout the mastorpillarisconstructed as follows: I is a circular gear-rim which is secured around the mast at a short distance above the rotary platform O. This gear-rim is arranged concentric with the vertical pivot line or axis about which the boom and its IOO rotary platform turn or swing. K is the actuating-cylinder, which Vis secured horizontally and tangentially to the rotary platform C and provided with a piston Zand a piston-rod Z. The latter projects through a stuffing-box at the inner end of the cylindernthat is to say, the'end of the cylinder which is nearest the mast-and is secured to a rack-bar L, which is arranged parallel with the piston-rod between the cylinder and the mast. M is a horizontal gear-wheel which is arranged near the inner end of the cylinder and which is interposed between the rack-bar L and the gear-rim I, so as to mesh with both. This gear-wheel turns on a vertical arbor m, which projects upwardly from the movable platform C,to which it is secured, as shown in Fig. 5. NN' represent horizontal guides in which the rack-bar is guided on both sides of the gear-wheel M.

The piston Z in the cylinder K is actuated by any suitable iiuid under pressure, preferably compressed air.

O represents the supply-pipe for the actuating fiuid, which is supported on the mast and which terminates in a branch O', leading to the cylinder E of the hoisting mechanism, and a branch O2, leading to the cylinder K of the boom-turning mechanism. The branch O' is provided with a four-way cock P, which controls the admission of iiuid to and the exhaust from the pipespp, leading to opposite ends of the hoisting-cylinder E. The brauch O2 is provided with a similar four-way cock P', which controls the pipes p2 p3, leading to opposite ends ot' the boom-turning cylinder K.

Upon driving the piston Z forwardly in the cylinder K, as indicated by the arrow l in Fig. 3, the rack-bar is moved forwardly and the gearwheel M is turned forwardly in the direction of the arrow 2 and rolls on the stationary gear-rim, thereby turning the rotary platform (Jin the direction of the arrow 3 and swinging the boom in that direction. As the cylinder is secured to the rotary platform, it moves in the same direction. Upon reversing the movement of the piston these parts are moved in the opposite direction.

Myimproved boom-turning mechanism en ables the rotary platform and the boom carried thereby to be swung through nearly a complete revolution. This renders this apparatus particularly desirable for use in railroad-yards, where a considerable lateral range of movement of the boom is required for carrying loads over several tracks.

Q represents horizontal rollers which are mounted in the openings Q of the platform through which the mast projects. These rollers are arranged on that side of the platform over which the load is suspended and bear against the mast, thereby centering the platform on the mast and resisting any tendency of the load to displace the platform.

In the modified construction of the boomturning mechanism (represented in Fig. 8) the intermediate gear-wheel M is omitted and the rack-bar L meshes directly with the stationary gear-rim I. This modified construction is less desirable, for the reason that it does not furnish the leverage which is furnished in the first-described construction by locating the axial line of the cylinder at a considerable distance outwardly from the gear-rim, which is rendered possible by the intermediate gear-wheel M. The leverage so afforded by the first-described construction enables the boom to be swung with asmaller pressure o f fluid.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means covered by any one of the following claims be employed.

I therefore particularly point out and distinctly claim as my invention-` 1. The combination of a rotatable platform; a fluid-pressure cylinder and piston arranged with reference to said platform in a manner such as to produce the rotation of the latter upon the movement of the piston in its cylinder; a stationary boom-support coperating with said cylinder and piston to produce such rotation; an inclined boom supported intermediately of its extremities upon said support and having a rotatable movement thereon; means for securing said boom in a position stationary relative to said platform, whereby said platform and boom will ha ve a corresponding movement; and means forsupplying pressure to the cylinder.

2. The combination of a rotatable platform; a stationary boom-support; a Huid-pressure cylinder and piston coperating therewith,

' said cylinder and piston being arranged with reference to said platform in a manner such as to produce the rotation of the latter upon the movement of the piston in its cylinder; means for supplying pressure to the cylinder; and an inclined boom supported intermediately of its extremities upon said support, said boom having a positive connection with the platform to cause a simultaneous rotary movement therewith, said boom being held against a longitudinal movement.

Witness my hand this 18th day of July,

JAMES MACBETH.

Vitnesses:

THEO. L. Porr,

CLAUDIA M. BENTLEY.

IIO

Images