Bicycle sprocket wheel

Details Bicycle sprocket wheel Bicycle sprocket wheel

1977-07-25

1979-03-20

Scott, Samuel

Machine element or mechanism

Gearing

Toothed gear and recirculated unconnected elements

74447, 74DIG10, 742304, 742303, 403 3, 403365, F16H 5512, F16H 5530

Patent

active

041447735

ABSTRACT:
A bicycle sprocket wheel comprises a toothed outer annular member molded of a tough nylon plastic and a centrally disposed metal spider having a plurality of radial arms attached to the sides of the annular member to add structural rigidity thereto. The teeth of the annular member are formed with straight front and back faces and with sharp corners at the roots thereof. Such a construction reduces the cost of the mold used for molding the annular member since the cavity needed therein for the teeth can be simply machined by use of straight and circular cuts. The inner radial edge of the annular member is shaped by an insert in the mold to form sets of circumferentially spaced arcs, the arcs of each set having a common radius different from the other sets to accomodate spiders having arms of different radial lengths.

REFERENCES:
patent: 601990 (1898-04-01), Suter
patent: 2948055 (1960-09-01), Baxter et al.
patent: 3477303 (1969-11-01), Brilando
patent: 3550465 (1970-12-01), Maeda
patent: 3835729 (1974-09-01), Tarutani
patent: 3838929 (1974-10-01), Burrell
patent: 4078445 (1978-03-01), Kiser, Jr.

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