Browse Prior Art Database

CHAIN TENSIONING DEVICE

IP.com Disclosure Number: IPCOM000022983D
Original Publication Date: 1976-Jun-30
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 421K

Publishing Venue

Xerox Disclosure Journal

Abstract

A chain tensioning device is provided wherein a spring biased sprocket engages a chain to exert tension thereon. The device includes a mechanism to allow a service person to relieve the tension exerted on the chain by the tensioning device and to inactivate the spring biasing force while leaving both hands free to repair or replace the chain. The construction of the mechanism allows a simple manipulation to activate the spring biasing force to exert tension on the chain after the chain has been repaired or replaced.

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CHAIN TENSIONING DEVICE (Cont~d)

A chain tensioning device is provided wherein a spring
biased sprocket engages a chain to exert tension thereon.
The device includes a mechanism to allow a service person
to relieve the tension exerted on the chain by the tensioning
device and to inactivate the spring biasing force while
leaving both hands free to repair or replace the chain. The
construction of the mechanism allows a simple manipulation
to activate the spring biasing force to exert tension on the chain after the chain has been repaired or replaced.

During a normal tensioning mode of operation, the lever 58 is in the position as shown whereby a spring 70 urges the edge 76 of the lever 58 into engagement with the edge 78 of a retainer bar 42 thereby urging a detent tooth 54 into
engagement with serrated teeth 50, A spring 36 urges a shaft 30 and thereby a sprocket wheel 16 upwards exerting
tension on a chain 2. As the chain stretches, the spring
urges the shaft upwards to maintain constant tension thereon
whereby a serrated tooth 50 will slide up detent tooth 54
and the detent tooth 54 will engage a new tooth 50 and
prevent the shaft from moving downwards and allow the chain
to slacken, When it is desired...