Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Cable and hook tackle
Patent
1987-02-03
1988-03-01
Marbert, James B.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Cable and hook tackle
254391, B66C 112
Patent
active
047281383
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an automatically acting, lockable hoisting block for automatically and/or manually locking a lifting member running through it, the block being intended to be disposed in any attitude in relation to the load to be lifted with the aid of the lifting member.
In hoisting blocks of the prior art having automatic locking of a rope running through the block, in which the rope is attacked at both ends to a load to be lifted, locking is accomplished by a means associated with the block and turnable in relation to it, this means turning in response to tension in the rope and thus firmly clamping the rope. This type of device is described in U.S. Pat. No. 4,097,083, for example. A drawback with the known device is that the block must move along the rope until both parts of the rope have been stretched, in order to achieve locking between rope and block. A further drawback is that the locking member causes undesirable wear on the rope, with the accompanying risk of rope failure. Furthermore, the locking force ceases as soon as the load in one rope part comes against an obstruction and ceases to weigh down on this part. SE 169 695 describes another hoisting block of the self-adjusting type. In this device the lifting means includes a saddle member, which has in cross section a V-shaped groove in which the lifting rope is intended to run. The shape of the groove causes it to engage against the rope to avoid the rope slipping. This arrangement has the result that the block is very difficult to adjust in relation to the rope, and several adjustments of rope to block will be necessary before hoisting may be performed. Here as well, both rope parts must be loaded for the rope to become locked. The object of the present invention is to provide a hoisting block not having the drawbacks mentioned and which, with automatic and/or manual action, is lockable in an adjustable position in any attitude in relation to the load to be hoisted. With the inventive hoisting block, hoisting may also take place even when the load is not in a position of equilibrium, and when the different parts of the hoisting member are unequally loaded. This also means that one of the parts can be completely unloaded during hositing with the inventive block.
The distinguishing features of the present invention are apparent from following claims.
The invention will now be described with reference to the accompanying drawings illustrating an embodiment of the inventive hoisting block, and where
FIG. 1 is a schematic elevation of a first embodiment of the inventive hoisting block, with a frontcover removed,
FIG. 2 is a cross section through the block of FIG. 1,
FIG. 3 is a schematic elevation of a second embodiment of the hoisting block in accordance with the present invention with the front cover removed.
A first embodiment of an inventive hoisting block is illustrated in FIG. 1, the block being intended for coupling to an unillustrated hook on a hoisting crane or any other hoisting means. The inventive block 1 comprises a main block 2 with an associated cover 3, the function of which will be explained later. The main block 2 is configurated in its cross section as a substantially U-shaped part with horizontal legs between which there is formed a recess or opening 4 for accommodating the mechanism locking a cable, rope, band, chain or any other hoisting member. A pair of lugs 5 or the like, attached to the block 2 form fulcra for arms 6,7 which are turnable relative the block. The lugs 5 engage in recesses, not shown in more detail, in the arms 6,7. Since the arms are alike, the description of them will be confined to the right arm in FIG. 1. The arm 7 has an elongate curved configuration in a vertical plane, and is provided with bearing surface 8 in its longitudial direction. A rope, band or similar hoisting member 30 can run freely over the surface 8, which is its transverse direction is defined by projection flanges or the like forming walls on the arm. When the hoisting member is a rope, chain or the like, the bearing s
REFERENCES:
patent: 1389514 (1921-08-01), Kestoll
patent: 1636273 (1927-07-01), Baker
patent: 4097083 (1978-06-01), Schwartz
Kelman Kurt
Marbert James B.
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