Piston for disc brakes

Details Piston for disc brakes Piston for disc brakes

1985-04-08

1990-05-29

Nilson, Robert G.

Expansible chamber devices

Piston

Nonmetallic portion

188 7338, F16J 100

Patent

active

049285793

ABSTRACT:
An improved disc brake plastic piston is described which has a metallic cap or face which provides a means of attaching a brake shoe or a brake shoe assembly, or provides a dust boot groove, or, in a most preferred mode, the metallic cap component provides both a brake shoe retaining means and a dust boot groove. The piston is comprised of a cylindrical plastic body having an open end and a closed end. At least one ring bead can extend from the wall of the piston body contiguous to, or near, the open end. A metallic cap extends over the end wall of the open end of the cylindrical body and is secured to the body by being snap fit or clamped over the ring bead. Alternative means for anchoring the metallic cap are provided, such as by crimping the interior lip of the metallic cap or by providing threads on the internal or external walls of the piston adjacent to the open end of the piston, and corresponding or matching threads on the metallic cap.

REFERENCES:
patent: 3497038 (1970-02-01), Schrader
patent: 3612409 (1971-10-01), Henning
patent: 3730570 (1973-05-01), Brochstein
patent: 4042072 (1977-08-01), Baba
patent: 4170926 (1979-10-01), Emmett
patent: 4186824 (1980-02-01), Preston
patent: 4203354 (1980-05-01), Cunningham
New Pin Slider Disc Brake Designs for Compact U.S. Cars of the 80's; SAE Technical Paper Series; No. 810,314; D. Bieraeugel and K. Stoerzel; Feb. 23, 1981, copy supplied by applicant in parent application No. 06/293,645.

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