Elevators: A Practical Treatise on the Development and Design of Hand, Belt, Steam, Hydraulic, and Electric Elevators (Classic Reprint)
Book Details
Author(s)John H Jallings
PublisherForgotten Books
ISBN / ASIN1332718418
ISBN-139781332718412
AvailabilityUsually ships in 24 hours
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
Excerpt from Elevators: A Practical Treatise on the Development and Design of Hand, Belt, Steam, Hydraulic, and Electric Elevators
When the hoisting belt was shipped on to the tight pulley, the drum or the winding machine commenced to wind up the cable connected to the upper drum which, being already wound on that one, would in the process of unreeling cause it to revolve. It in turn wound up the cable attached to the car, thus hoisting it up the hatchway, and 'vice versa. If, when the motion was changed for lowering, the cable between the upper and lower drum should break, the quick descent of the car would cause the upper drum to revolve fast enough to make the governor trip the bolt and let the lever drop and apply the brake.
This safety device, however, had the defect of being incomplete, inasmuch as it was operative only in case of a rundown owing to a broken or imperfectly shipped belt, or when the cable between the drums parted, but not when the cable from the drum to the car broke. This latter contingency was provided for by the use of safety dogs on the car, which were actuated by a spring.
This safety device has been described in detail because it was at one time considered one of the best in use, 'and because it was the forerunner of the modern type of governor safety. This form of safety was introduced somewhere around 1864 or 1866, when power elevators were in their infancy.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
When the hoisting belt was shipped on to the tight pulley, the drum or the winding machine commenced to wind up the cable connected to the upper drum which, being already wound on that one, would in the process of unreeling cause it to revolve. It in turn wound up the cable attached to the car, thus hoisting it up the hatchway, and 'vice versa. If, when the motion was changed for lowering, the cable between the upper and lower drum should break, the quick descent of the car would cause the upper drum to revolve fast enough to make the governor trip the bolt and let the lever drop and apply the brake.
This safety device, however, had the defect of being incomplete, inasmuch as it was operative only in case of a rundown owing to a broken or imperfectly shipped belt, or when the cable between the drums parted, but not when the cable from the drum to the car broke. This latter contingency was provided for by the use of safety dogs on the car, which were actuated by a spring.
This safety device has been described in detail because it was at one time considered one of the best in use, 'and because it was the forerunner of the modern type of governor safety. This form of safety was introduced somewhere around 1864 or 1866, when power elevators were in their infancy.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
