Limit switch weight apparatus for crane hoist drives

Traversing hoists – With haul-in line

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Details

254269, B66C 2390

Patent

active

054050278

ABSTRACT:
Disclosed is a crane hoist system having a hoist drum, a drum drive motor and control and power circuit limit switches. The improvement involves a first trip bar coupled to the power circuit limit switch and a second trip bar coupled to the control circuit limit switch. The bars are-vertically aligned and both are pivot mounted at their corresponding ends. The second trip bar is mounted for movement independently of the first trip bar. If the control circuit limit switch fails to function as the second bar is moved a suitable distance upward, such bar contacts and lifts the first bar which, in turn, trips the power limit switch. In one embodiment, both bars are straight and elongate and in another, the second bar is "U" shaped.

REFERENCES:
patent: 761884 (1904-06-01), Harding
patent: 2365141 (1944-12-01), Sally
patent: 3233746 (1966-02-01), Fawell
patent: 3834551 (1974-09-01), Nanowsky
patent: 4300134 (1981-11-01), Paciorek
patent: 4560074 (1985-12-01), Manning
patent: 4905849 (1990-03-01), Coull
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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