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US 5,314,082 AGranted
Sensing device for indicating improper orientation of a hoist lifting line
AssigneeHarnischfeger Corporation
InventorJeffrey A. Konop
Life of this patent
Estimating the term…
Abstract
An overhead crane comprising a frame, a hoist mounted on the frame, the hoist including a lifting rope, and a device for detecting a side pull condition of the lifting rope.
Claims16
A sensing device for indicating that a laterally shiftable lift element of a hoist has deviated from a desired orientation, said device comprising:
- a signal generating means for generating a reference signal;
- a reference means having a reference position when the lift element is at the desired orientation, said reference means including spaced apart ends and a receptor means mounted adjacent one of said ends to intercept said reference signal and generate an output signal in response to said reference signal when said reference means is in said reference position, and said reference means also including guide means mounted adjacent the other of said ends for contact with the lift element;
- a mounting means pivotally connected to said reference means intermediate said spaced apart ends for securing said reference means to allow movement thereof from said reference position in response to deviation of the hoist lift element from the desired orientation;
- and
- a detecting means for generating a control signal in response to receipt of said output signal, said detecting means being positioned so as to receive said output signal from said reference means only when said reference means is in said reference position.
2 more elements
A hoist comprising:
- a frame;
- a rotatable hoist drum mounted on said frame;
- a laterally shiftable lift element connected to depend from said drum at a desired orientation;
- a prime mover operatively connected to selectively rotate said drum for raising and lowering said lift element;
- and
- a sensing device for indicating that said lift element has laterally shifted from said desired orientation, said device including
- a signal generating means for generating a reference signal,
- a reference means for intercepting said reference signal and generating an output signal, said reference means being supported by said frame independent of said lift element and said signal generating means for movement in response to deviation of said lift element,
- a detecting means for receiving said output signal and for generating a control signal in response to receipt of said output signal, said detecting means receiving said output signal only when said lift element is in said desired orientation, and
- an indicator means responsive to the absence of said control signal for indicating that said laterally shiftable lift element is not in said desired orientation.
7 more elements
An overhead crane comprising
- a frame,
- means supporting said frame for horizontal movement,
- a hoist mounted on said frame, said hoist including a lifting rope having a desired orientation,
- a signal generating means for generating a reference signal, and
- means supported by said frame independent of said lifting rope and said signal generating means for detecting a side pull condition of said lifting rope, said detecting means having a reference position when the lifting rope is at the desired orientation and said detecting means intercepting said reference signal when in said reference position.
2 more elements
Dependencies are inferred from the claim text.