Climbing assist apparatus having controlled descent and escape mechanism
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 5, 1985
Grant Date -
N/A
app pub date -
Feb 15, 1984
filing date -
Feb 15, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A climbing assist apparatus for oil derricks and the like comprises a cable which is attached to the worker and is trained over a sheave at the crown portion of the rig, then connected to a counterweight in order to remove slack from the cable as the worker is climbing. The sheave is keyed to a motor drive shaft which is free wheeling in one direction of rotation in response to advancement of the cable as the workman is climbing but will impose a controlled resistance in the opposite direction, this resistance being established through a hydraulic motor for the drive shaft and a hydraulic control circuit which includes a flow controller to resist the rotation of the motor in the opposite direction to that earlier described when the worker descends or should accidentally fall from the derrick.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully