Rope traction device with connected locking units
Patent 5738339 Issued on April 14, 1998. Estimated Expiration Date: 
March 21, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 21, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2922623 3438423 3669223 Hoist apparatus Cable climber safety lock Safety lock for a hoisting mechanism that ascends and descends a cable Hoist apparatus Automatic anti-fall device for manual or motorized lifting systems Rope locking device with lock device and lock release therefor Fall arrest device InventorAssigneeApplicationNo. 619406 filed on 03/21/1996US Classes:254/267, Having rotational speed governor for generating control impulse to rotation retarding means or drive182/234, Movable, friction brake element applied by centrifugal force182/239, Movable, friction brake element applied by centrifugal force188/65.1, STRAND188/188, Strand-engaging254/333, Having pressure element spaced from drum to confine cable thereagainst254/391With mechanism for retarding or preventing cable movement or element rotationExaminersPrimary: Stodola, Daniel P.Assistant: Marcelo, Emmanuel M. Attorney, Agent or FirmForeign Patent References
International ClassB66D 001/48Foreign Application Priority Data1995-03-30 JPAbstractA rope traction device has locking units that include a sheave on which a traction rope is wound. The rope traction device is adapted to be moved along with the traction rope and includes a traction rope inlet for feeding the traction rope to the sheave a traction rope outlet for feeding out the traction rope, a traction rope locking device for locking the traction rope when an increase in the speed of the traction rope is detected, and an auxiliary rope locking device provided in the vicinity of the traction rope inlet for detecting relative moving speed of an auxiliary rope suspended from the rope traction device. An interconnection is provided between the traction rope locking device and the auxiliary rope locking device in order to provide simultaneous engagement of the separate locking devices.Field of SearchHaving rotational speed governor for generating control impulse to rotation retarding means or driveHaving pressure element spaced from drum to confine cable thereagainst Including static receiver spaced from drum for storing pulled cable With mechanism for retarding or preventing cable movement or element rotation Movable, friction brake element applied by centrifugal force Movable, friction brake element applied by centrifugal force Load-responsive brake Acceleration responsive Strand-engaging STRAND | |
