DE2417754A1 - SAFETY LIFTER - Google Patents

Description

Safety hoist

The invention relates to a safety hoist for multiple legs Rope suspensions with rope pulleys arranged in one row, with the Lifting drums for winding up the free rope ends, with rope guide pulleys and with resilient fixings for the solid ones Rope ends, the loose rope ends of two separate pulley blocks in a known manner on two lifting drums, the fixed ends end at the common cable compensation drum, and that the two pulley blocks each have a common upper and lower block have and are arranged one inside the other that an outer pulley encloses an inner pulley, according to U.S. Patent 1,781,200.

In the case of the safety hoist according to the main patent, this results in that each pulley system has a separate upper and lower block possesses and the outer block and tackle encloses the inner block and tackle, a relatively large overall height, so that such arrangements are not applicable everywhere.

The invention has set itself the task of the main patent to that effect to improve that the overall height is reduced, but the mode of operation is not impaired.

According to the invention this object is achieved in that the

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Rope pulleys of the upper and lower block of both pulley blocks each on lie on a common axis and the pulleys alternately have different diameters, one pulley with large diameter of the upper block a rope pulley with a small diameter of the lower block and vice versa face and the ropes are crossed in opposite directions by placing the rope of one pulley over the large-diameter pulleys and the rope of the other pulley block are passed over the small-diameter pulleys.

An exemplary embodiment of the invention is shown schematically in the drawing shown. Show it:

Fig. 1 is a section from which the arrangement of the two pulley blocks can be seen in one another is,

FIG. 2 the view A of FIG. 1.

The lifting drums 1, 2, which wind up and down the loose ends of the two nested pulley blocks for moving the load, are shown here coaxially. The ropes 3, 3 ^{f of} the two pulley ^{blocks, the rope 3 1 of} the inner pulley block being shown in phantom, are guided over a common bottom block and a common top block, the axes a, b of which run parallel and lie on a common vertical plane c. The upper block consists of a number of pulleys 5, 8, which are mounted independently of one another on the axis a, wherein

509844/0067

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the pulley 5, over which the rope 3 of the outer pulley runs, has a larger diameter than the pulley 8, over which the rope 3 ^{1 of} the inner 3-lashing block runs. The pulleys 5, 8 are alternately mounted on the axis a so that there are no pulleys of the same diameter next to one another. The bottom block also consists of a number of rope pulleys 4, 7, which are rotatably mounted independently of one another on the axis b, the rope pulleys 4, 7 having different diameters. The pulley 4, over which the rope 3 runs, has a pulley 5, and the pulley 7? Over which the rope 3 ″ runs, has a diameter that corresponds approximately to the rope pulley 8. Here, too, the pulleys 4, 7 are alternately mounted on the axis b so that the pulleys lying next to one another have different diameters. The pulleys 4, 7 are arranged with respect to the pulleys 5> 8 in such a way that a pulley 5 with a pulley 7 and a pulley 8 with a pulley 4 each face each other on a common vertical plane. This arrangement ensures that the ropes 3 »3" run in opposite directions and not interfere with one another in a zigzag manner over the associated rope pulleys 4, 5 "and 7, 8, the rope 3 surrounding the rope 3 'at a distance. The free ends of the ropes 3 ₅ 3 ¹ are attached to the compensating drum 10 opposite and facing in opposite directions, which is necessary so that the entire rope system is statically determined, ie so that the two pulley blocks are evenly loaded. In the compensating drum 10, however, a rotation limitation is built into it.

509844/0067

Claims (1)

Claim Safety hoist for multi-strand rope suspensions with rope pulleys arranged in one row, with the hoist drums for winding up the free rope ends, with rope guide pulleys and with flexible fastenings for the fixed rope ends, whereby the loose rope ends of two separate piaschen pulls are connected in a known manner to two lifting drums, the fixed ends on the common cable equalization drum ends, and that the two pulley blocks each have a common upper and lower block and are arranged one inside the other in such a way that an outer pulley block encloses an inner pulley block, according to patent 1,781,200, characterized in that the pulleys (5, 8) and ( 4, 7) of the upper and lower block of both pulley blocks each lie on a common axis (a and b) and the pulleys alternately have different diameters, with a pulley (5) with a large diameter of the upper block and a pulley (7) with a small diameter of the Bottom block and vice versa face each other and the ropes (3, 3 ') cross each other in opposite directions, by pulling the rope (3) of one pulley over the pulleys (4, 5) with a large diameter and the rope (3 ¹ ) of the other pulley over the pulleys (7 , 8) are guided with a small diameter. 509844/0067