GB716628A - Improvements in transportable hoists - Google Patents

Abstract

716,628. Load handling machines; catch gear. WARRY, Ltd., R. F. Nov. 10, 1952, [Nov. 13, 1951.] No. 26594/51 . Classes 78 (3) and 78(5). A transportable hoist has a vertical column rigidly connected or formed integrally with a base frame which rests upon the ground with the column upright, the column being tiltable to a substantially horizontal position for transport about a number of fulcra which are fixedly mounted on the column and during tilting are brought successively into contact with the ground. A hoist, Fig. 2, comprises front upright and .rear inclined braced supports 1 and 1a mounted on members in a base frame 2 and a platform 7 guided by rollers 41 on the column and raised by a rope 23 wound on a winch 18 driven by a motor supported on a bearing on the base. The column is erected on the ground from a horizontal position on a support or pair of wheels 10 by raising the column to rest first on the wheels 10, which are connected by struts 15, 16 with the column, and then on a cross bar 8, connected by struts 11, 12 and 13 with the column. Further raising causes the column to rest both on the cross bar 8 and on the rear corner edge of the base, finally by pivoting the column about the corner edge the column is erected with the base 2 on the ground. The reverse procedure takes place for lowering the column onto the wheels or a support. The hoisting rope passes from the winch over a pulley at the top of the column, round a pulley on the platform frame, round an arch shaped member at the top of the column to an anchorage. A second rope extends round a pulley on a lateral extension of the top member and is connected with the motor clutch. The rope carries a collar and the platform carries a bar with an aperture to slide over the rope whereby at the limit of hoist the bar strikes the collar and disengages the clutch to stop the drive. A rope 57 also connects with the clutch lever and also, but with slack, the rope with the collar. The platform is mounted on horizontal supports 36 connected to a pair of vertical supports 37 which carry rollers 41 at the bottom and on an extension at the top to engage front and rear faces of uprights i. The supports 36 support inclined members 39 secured to the extension. A horizontal bar 43 is connected to the pulley 29 by a bar 46 and to the platform frame by end springs 45. One end of the bar is connected by a lever 48 to a friction bar 49 guided vertically by members 50 on a member 37 to be close to the front face of an upright 1. Journaled in a boss 52 on the bar 49 is a pin connected to a stout block 54 having a lateral projection 55 facing the rear flange of the upright i. The block rests on a pin 54a connected to the member 37. Should the rope break the bar 43 is pulled downwards by the springs 45 and lowers the bar 48 thus rocking the block 54 and forcing the part 55 against the upright the bar 49 also bearing against the upright. The bar tilts slightly increasing the grip. The platform will drop slightly under the load increasing the wedging action until the top of the platform 38 abuts the top of the bar 49. The block is fitted with a handle 56 whereby the platform may be manually locked in position for purposes such as extending the column.