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Investigation of Requirements and Performance of Safety Catches on Wire-rope-suspended, Man-carrying Conveyances in U.S. Coal Mines.

Larsen CH; Egen RA; Cress HA
NTIS: PB/218-067/7 Available for Reference At Bureau Libraries :160 pages
This report presents the results of a comprehensive investigation of conveyance arrestment devices (safety catches) in U.S. coal mines. Availability and use, performance, inspection, maintenance, testing, procedures, and regulatory requirements were investigated. Information was obtained from equipment manufacturers, mine operators, and regulatory-agency personnel, as well as from studies of domestic and foreign mining safety regulations. Tradtional mine hoists and commercial elevators for mine use were investigated. Results of this and an earlier study of wire-rope practice in U.S. coal mines show a continued need for conveyance arrestment devices. Only two types have been proved reliable for stopping a conveyance without injuring passengers or equipment. These are elevator overspeed-actuated wedge-clamp safeties and broken-rope-actuated devices for wooden guides using a single-tooth-dog developed in Ontario as a braking element. Elevators are widely used in U.S. coal mines, and appear to present no major arrestment problems when using ANSI specifications.
Publication Date
Document Type
CP; Final Contract Report;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
OFR 18-73
NIOSH Division
Source Name
NTIS: PB/218-067/7; Available for Reference At Bureau Libraries
Performing Organization
Battelle Memorial Institute
Page last reviewed: October 29, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division