Christopher John Duke
Engineers at Vrain St, Denver, CO
License number
Colorado 42137
Issued Date
Jul 3, 2008
Renew Date
Nov 1, 2015
Expiration Date
Oct 31, 2017
Type
Professional Engineer
Address
Address
2835 Vrain St, Denver, CO 80212
Professional information
Retrieval And Fall Arrest System For Manhole Applications
US Patent:
2008028, Nov 27, 2008
Filed:
May 2, 2008
Appl. No.:
12/151018
Inventors:
Bradley A. Pelsue - Denver CO, US
Edward J. Inman - Denver CO, US
Timothy G. Peters - Boulder CO, US
Christopher J. Duke - Denver CO, US
Mark R. Niksic - Conifer CO, US
Edward J. Inman - Denver CO, US
Timothy G. Peters - Boulder CO, US
Christopher J. Duke - Denver CO, US
Mark R. Niksic - Conifer CO, US
International Classification:
A62B 1/08
US Classification:
182236
Abstract:
A foldable hoist, fall-arrest and recovery system to be used in connection with a rectangular manhole guard having vertical posts at four corners of the guard including an upper structure having four elongated support members forming a pyramid shaped structure with the base of each of the support members being securely mounted to the top of a post on the manhole guard and the other ends of the support members being pivotally connected to an apex so that the upper structure can be folded for storage and shipment when disconnected from the base and means connected at the apex for raising and lowering workers and/or cargo into and out of the manhole or for arresting the fall or recovering a worker.