US 5,735,507 AGranted

Safety system for hoist apparatus

AssigneeGanchos de Seguridad, S.L.

InventorsEmilio Sierra Escudero, Jose Sierra Escudero

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Abstract

Safety system for hoist apparatus, used with all types of cranes employing a flexible element for the handling of a load, the device preventing the free fall of the load in the event of a flexible element rupture, where the flexible element (3) is conducted and guided in the interior of a housing, the system further comprising a pair of pulleys (4) and (5), tie-down mechanism capable of gripping the intact branches of the flexible element, and an activating mechanism which includes a latch, wherein in the normal working position, the flexible element freely circulates through the interior of the housing, and the latch (6) remains in a fixed position, and wherein the rupture of the flexible element displaces the latch, activating the system and gripping an intact portion of the flexible element with the tie-down mechanism.

Claims40

Dependent claims

A safety device for a hoist apparatus which includes a flexible element (3) to hoist a load, said device comprising:

a housing (1);
hooking means (2) disposed on said housing for connecting the device to a load;
trajectory definition means (4, 5) disposed inside said housing (1) for defining a trajectory of the flexible element (3) passing through said housing (1), said trajectory definition means (4, 5) including a pair of lower pulleys (5) disposed such that the trajectory of the flexible element (3) through said housing (1) during operation comprises a first, substantially vertical, branch (3a), a second, substantially horizontal, branch (3c), and a third, substantially vertical, branch (3b);
first locking means (10, 13-17) disposed within said housing and displaceable between an open position and a locking position;
second locking means (19) situated within said housing (1), wherein said first locking means (10, 13-17) and second locking means (19) define gaps therebetween which are adapted to allow the flexible element (3) to pass therethrough when the flexible element is intact, wherein the flexible element (3) can move freely through said gaps when said first locking means is in the open position, and wherein a portion of the flexible element (3) is locked between the first locking means (10, 13-17) and the second locking means (19) when said first locking means is in the locking position;
a latch means (6) displaceable between a first position and a second position and disposed within said housing (1) for maintaining the first locking means (10, 13-17) in the open position while the latch means (6) remains in the first position and the flexible element remains intact;
first activation means (7, 9) for moving the latch means (6) from the first position to the second position when the flexible element (3) ruptures, including support means (7) for keeping the latch means (6) in a first position;
and
second activation means (20) for displacing the first locking means (10, 13-17) to the locking position when the latch means (6) is displaced from the first position towards the second position.

6 more elements

A safety device for use with a hoist apparatus having a flexible element for hoisting a load, said safety device comprising:

a housing;
hooking means disposed on said housing for connecting the load to the device;
mobile locking means disposed within said housing, wherein said mobile locking means is displaceable between an open position and a locking position;
second locking means fixedly situated within said housing, wherein said mobile locking means and second locking means are disposed in relation to each other so as to define gaps therebetween which accommodate the flexible element, wherein the gaps permit the flexible element to move freely therethrough when said mobile locking means is in the open position and wherein said device prevents the flexible element from moving freely through said gaps when said mobile locking means is in the locking position;
latch means for maintaining the mobile locking means in the open position when said latch means is in a first position, and for allowing the movable locking means to assume the locking position when said latch means is displaced from the first position;
first activation means for maintaining the latch means in the first position and for displacing the latch means from the first position when the flexible element ruptures;
second activation means for displacing the movable locking means into the locking position when the latch means is displaced from the first position;
and
trajectory definition means for guiding the flexible element through the interior of the housing so as to define a path for the flexible element which passes into said housing, through the gaps between said movable locking means and second locking means and in contact with said first activation means.

6 more elements

Dependencies are inferred from the claim text.