Dual weight assembly for a crane

Details Dual weight assembly for a crane Dual weight assembly for a crane

1994-10-13

1995-10-03

Huppert, Michael S.

Traversing hoists

Having random condition sensor combined with an indicator or...

Hoisting stops upon load being raised to a predetermined...

254269, B66C 1318

Patent

active

054544742

ABSTRACT:
The disclosure involves a material handling machine, e.g., a crane, having a control circuit switch and a power limit switch. Disclosed is a new weight assembly having first and second weights. The control switch is maintained at a position by the first weight and the power switch is maintained at a position by the second weight which is positioned above the first weight. The weights are telescoped to one another so that vertical weight alignment is assured as the crane hoist bottom block contacts and lifts the first weight. If the bottom block continues its upward travel past a maximum desired elevation, the first weight (urged by the bottom block) lifts the second weight, permitting the power limit switch to trip and preventing the bottom block from continuing upward. And the new assembly is ideal where the space available for limit switch weights is restricted.

REFERENCES:
patent: 761884 (1904-06-01), Harding
patent: 1369147 (1921-02-01), Valls
patent: 3233746 (1966-02-01), Fawell
patent: 3834551 (1974-09-01), Nanowsky
patent: 4535899 (1985-08-01), Bergeron
Harnischfeger Bulletin ED-8--Limit Switches--Types DB135, DB270 and DB540.
Harnischfeger Bulletin 592--Type HB Control Circuit Limit Switch for Hoist Motion.
Harnischfeger Bulletin 592--DB90 Power Limit Switch for Hoist Motion.
Harnischfeger Bulletin 592--Limit Switches for Hoist Motion.

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