Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Moves about vertical axis
Patent
1990-10-15
1991-11-12
Scherbel, David A.
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Moves about vertical axis
52167R, E04H 1218
Patent
active
050637169
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to hoisting-and-conveying equipment and, more particularly, it relates to a hoisting apparatus.
BACKGROUND OF THE INVENTION
Known in the prior art is a hoisting apparatus realized in the form of a mast consisting of a vertical hollow rod secured in the base, the inside space of said rod accommodating strength members which are capable of moving along the rod. Said members are moved in two parallel rows--over the load carrying branch and the accumulating branch, the strength members being transferred from one branch to another by an operating mechanism installed in the rod base. The strength member nearest to the rod top supports a bracket connected to a cargo suspension (SU, A, 1051025).
The load capacity of the known apparatus is limited due to asymmetric application of load to the mast since the bracket carrying the cargo suspension and taking the load of the cargo moves over a guide located at one side of the rod, i.e. the load acts eccentrically relative to the vertical central axis of symmetry of the mast which restricts the load capacity of the apparatus.
There is another known cargo-hoisting apparatus in the form of a mast formed by four vertical rods interconnected by a lattice, two of said rods having spaces with strength members movably installed inside. One of strength members in each rod is connected with one of the cargo suspension brackets (SE, C, 417082). In this apparatus two rods with strength members are installed in one side plane of the mast while the two other rods, in the side surface of the mast which is parallel to the first surface; in this case the cargo suspension is, essentially, a beam whose ends are rigidly secured to the brackets and which has a cargo grip in the centre.
The hoisting apparatus is noted for a higher load capacity, since the load is distributed between two load-carrying branches in both rods with strength members. However, for reliable functioning of the known apparatus the strength members in the spaces of both rods should move in strict synchronism. If synchronism is disturbed, the cargo suspension may be cocked and jammed. Cocking of the cargo suspension also brings about heavy wear of parts at points where brackets interact with the strength members due to forces of friction. It should be noted that this hoisting apparatus is also characterized by asymmetrical effect of the load on the mast because the cargo suspension moves along one side of the mast so that the weight of the hoisted cargo acts eccentrically relative to the vertical central axis of symmetry of the mast.
SUMMARY OF THE INVENTION
The main object of the invention is to provide a hoisting apparatus with such a design of the mast and cargo suspension which would ensure application of load along the axis of symmetry of the mast during hoisting of the load, and uniform distribution of this load among all the rods of the mast and which would rule out the possibility of jamming of the moving cargo suspension even during asynchronous movement of the strength members in the rods.
This problem is solved by providing a hoisting apparatus in the form of a mast consisting of four vertical rods interconnected by a lattice, two of said rods having internal spaces accommodating strength members installed therein with a provision for moving along the rods, one of said members in each rod being connected with the corresponding bracket which, in turn, is fastened to the cargo suspension in which, according to the invention, two rods with strength members and two other rods are arranged in pairs symmetrically to the vertical axis symmetry of the mast and the cargo suspension is constituted by a rectangular frame fitting around the mast and formed by two parallel beams, rigidly connected, each, by its central part with the corresponding bracket, and by two parallel rocker arms whose ends are articulated to the ends of the beams.
In the hoisting apparatus realized according to the present invention the weight of the lifted cargo acts precisely along the central
REFERENCES:
patent: 468186 (1892-02-01), Beardsley
patent: 2739673 (1956-03-01), Foster
patent: 3954157 (1976-05-01), Atkey
Scherbel David A.
Wood Wynn
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