Safety device for lift equipment

Details Safety device for lift equipment Safety device for lift equipment

1979-08-27

1981-07-21

Spar, Robert J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

254 98, 744248R, 187 847, B66B 1104

Patent

active

042793297

ABSTRACT:
A safety device for spindle-operated lifting equipment, particularly for two-post motor-vehicle lifts having a lifting nut supporting a lift carriage guided on a post, the lifting nut being itself guided on a spindle. The safety device has a safety nut guided on the spindle and located a first predetermined small distance beneath the lifting nut. Upon excessive wear of the lifting nut, the safety nut supports the lifting nut. A lock nut is guided on the spindle and located a second predetermined small distance beneath the safety nut. The safety and lock nuts are connected to each other by a spring mechanism and are forced to move or run on the spindle with the lifting nut, when the lifting nut is moving on the spindle. When the safety nut supports the lifting nut, the association between the safety and lock nuts and the spindle is such that upward movement of the safety nut and the supported lifting nut is prevented. The safety nut and supported lifting nut can only move in a downward direction on the spindle.

REFERENCES:
patent: 2187390 (1940-01-01), Anderson et al.
patent: 3309060 (1967-03-01), Villans
patent: 3687234 (1972-08-01), Gendreau

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