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Title: Gravity brake

Abstract

A mechanical gravity brake that prevents hoisted loads within a shaft from free-falling when a loss of hoisting force occurs. A loss of hoist lifting force may occur in a number of situations, for example if a hoist cable were to break, the brakes were to fail on a winch, or the hoist mechanism itself were to fail. Under normal hoisting conditions, the gravity brake of the invention is subject to an upward lifting force from the hoist and a downward pulling force from a suspended load. If the lifting force should suddenly cease, the loss of differential forces on the gravity brake in free-fall is translated to extend a set of brakes against the walls of the shaft to stop the free fall descent of the gravity brake and attached load.

Inventors:
 [1]
  1. (Santa Fe, NM)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
874142
Patent Number(s):
US 6325184
Assignee:
The Regents of the University of California (Oakland, CA) LANL
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
gravity; brake; mechanical; prevents; hoisted; loads; shaft; free-falling; loss; hoisting; force; occurs; hoist; lifting; occur; situations; example; cable; break; brakes; fail; winch; mechanism; normal; conditions; subject; upward; downward; pulling; suspended; load; suddenly; cease; differential; forces; free-fall; translated; extend; set; walls; stop; free; fall; descent; attached; /188/187/

Citation Formats

Lujan, Richard E. Gravity brake. United States: N. p., 2001. Web.
Lujan, Richard E. Gravity brake. United States.
Lujan, Richard E. Mon . "Gravity brake". United States. https://www.osti.gov/servlets/purl/874142.
@article{osti_874142,
title = {Gravity brake},
author = {Lujan, Richard E.},
abstractNote = {A mechanical gravity brake that prevents hoisted loads within a shaft from free-falling when a loss of hoisting force occurs. A loss of hoist lifting force may occur in a number of situations, for example if a hoist cable were to break, the brakes were to fail on a winch, or the hoist mechanism itself were to fail. Under normal hoisting conditions, the gravity brake of the invention is subject to an upward lifting force from the hoist and a downward pulling force from a suspended load. If the lifting force should suddenly cease, the loss of differential forces on the gravity brake in free-fall is translated to extend a set of brakes against the walls of the shaft to stop the free fall descent of the gravity brake and attached load.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}

Patent:

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