Traversing hoists – With haul-in line
Patent
1987-04-28
1989-02-28
Peters, Jr., Joseph F.
Traversing hoists
With haul-in line
318628, B66C 1312
Patent
active
048077674
ABSTRACT:
The specification discloses a self-blancing screw jack that is responsive to small manually applied "upset" loads to move the load in the desired direction. A strain gauge measure the total load and is used to establish a null signal representative of the load at rest. This nulled signal is then continuously compared with the actual load signal. When the actual load signal varies from the preset nulled signal by a predetermined value, the drive motor is actuated to drive the load in the direction of the variance. A non-reversible gear means is used to support the load in the at rest position.
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Avila Stephen P.
Grumman Aerospace Corporation
Peters Jr. Joseph F.
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