Device for preventing derailment of a bicycle chain

Details Device for preventing derailment of a bicycle chain Device for preventing derailment of a bicycle chain

1996-08-21

1998-03-10

Schoeppel, Roger J.

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Pulley shifter

474118, 474134, 745015R, F16H 714

Patent

active

057254508

ABSTRACT:
A device for preventing derailment of a bicycle chain of a bicycle. Upper and lower guide members are positioned strategic to a drive sprocket of the bicycle to guide and maintain the chain in engagement with the drive sprocket regardless of the tension of the chain. The upper and lower guides force the chain to be engaged a longer circumferential distance on the drive sprocket to prevent the chain from jumping off the drive sprocket. Circular guards are mounted on each side of the drive sprocket to protect the drive sprocket and the chain entrained thereon from impact. The spacing of the circular guards provides a channel for receiving the chain as it traverses the drive sprocket.

REFERENCES:
patent: 1181175 (1916-05-01), Shapiro
patent: 1535114 (1925-04-01), Edmunds
patent: 2204084 (1940-06-01), Hughes
patent: 2240998 (1941-05-01), Montiglio
patent: 3398973 (1968-08-01), Shimano et al.
patent: 3402942 (1968-09-01), Shimano et al.
patent: 3416385 (1968-12-01), Schenk
patent: 3785219 (1974-01-01), Anthamatten
patent: 4099737 (1978-07-01), Waugh
patent: 4240303 (1980-12-01), Mosley
patent: 4261214 (1981-04-01), Watanabe et al.

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