Hoist system anti-drift device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 11, 2001
Grant Date -
N/A
app pub date -
Jan 7, 2000
filing date -
Jan 7, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gantry crane including a lifting grappler is provided with a hoist locking mechanism to prevent undesired downward drifting of the grappler, especially during periods when the crane is parked and not in operation. The hoist locking device can selectively secure the grappler in a raised position, maintaining a maximum clearance under the raised grappler. The crane includes a hoist line, such as a chain or cable, that suspendably supports the weight of the grappler, and a hoist actuator for moving the hoist line, thereby lifting or lowering the grappler. In an embodiment, the hoist locking device is selectively operable to secure the hoist line in a predetermined position, preventing the grappler from lowering. For example, an embodiment of the hoist locking device includes a hook-shaped latch member movably mounted to the frame for engagement with a catch member fixed relative to the hoist line. The catch member may, for example, be a projection from a clevis mounted to the hoist actuator. A latching actuator is provided for driving the hook between engaged and disengaged positions.
First Claim
Other Claims data not available