US 2006/0186388 A1 · Emergency brake for hoist systems

Abstract

A hoist assembly includes a frame, a hoist drum that is mounted for rotation with respect to the frame and a disc member, having first and second sides, that is mounted to rotate together with the hoist drum. First and second toothed wheels are connected to the rotatable hoist drum so as to rotate together with the rotatable hoist drum during normal hoist operation. First and second frictional bearing members are positioned, respectively, between the first and second sides of the disc member and the first and second toothed wheels. An adjustable compressive biasing system is provided in order to bias the first and second toothed wheels together. An arresting system is further provided for engaging the first and second toothed wheels simultaneously in order to preclude rotation of the toothed wheels during an emergency condition. Advantageously, a limited amount of relative rotation is permitted between the disc member and the first and second toothed wheels during arresting of the arresting system as a result of controlled slippage involving the first and second frictional bearing members.

Claims42

Dependent claims

A hoist assembly, comprising:

a frame;
a hoist drum that is mounted for rotation with respect to said frame;
a first toothed wheel connected to said rotatable hoist drum so as to rotate therewith during normal hoist operation;
arresting means for engaging said first toothed wheel in order to arrest rotation of said toothed wheel during an emergency condition;
and
frictional braking means mechanically interposed between said rotatable hoist drum and said first toothed wheel, whereby a limited amount of relative rotation is permitted between said rotatable drum and said first toothed wheel when said arresting means engages said first toothed wheel during an emergency condition.

3 more elements

A hoist assembly, comprising:

a frame;
a hoist drum that is mounted for rotation with respect to said frame;
a disc member that is mounted to rotate together with said hoist drum;
a first toothed wheel connected to said rotatable hoist drum so as to rotate therewith during normal hoist operation;
a second toothed wheel connected to said rotatable hoist drum so as to rotate therewith during normal hoist operation;
a first frictional bearing member operably positioned between said first toothed wheel and a first side of said disc member;
a second frictional bearing member operably positioned between said second toothed wheel and a second side of said disc member;
compressive biasing means for biasing said first and second toothed wheels toward each other;
and
arresting means for engaging said first and second toothed wheels simultaneously in order to arrest rotation of said toothed wheels during an emergency condition, whereby a limited amount of relative rotation is permitted between said disc member and said first and second toothed wheels upon engagement of said arresting means as a result of controlled slippage involving said first and second frictional bearing members.

7 more elements

Dependencies are inferred from the claim text.

Emergency brake for hoist systems

Life of this patent

Emergency brake for hoist systems

Life of this patent

Abstract

Claims42