Brake single or dual piston pusher tool

Details Brake single or dual piston pusher tool Brake single or dual piston pusher tool

1999-12-22

2001-02-27

Smith, James G. (Department: 3723)

Metal working

Means to assemble or disassemble

Spreading parts apart or separating them from face to face...

C029S233000, C029S256000, C029S263000

Reexamination Certificate

active

06192566

ABSTRACT:

FIELD OF INVENTION
This invention relates to a piston pushing tool for use in replacing worn brake pads in disc brake assemblies.
When a motorist applies pressure to the brake pedal, a piston means within a caliper mechanism works on brake pads positioned on opposite faces of the rotating disk to apply a braking force to a ground wheel.
Brake pads become worn after a duration of service, thereby necessitating their removal and replacement with new brake pads. One problem encountered during the brake pad replacement operation is retraction of the associated piston or pistons into its cylinder.
DESCRIPTION OF PRIOR ART
Many tools have been introduced for pushing pistons within disc brake assemblies. Most of these are quite complicated, and all have several problems inherent in them.
Inventors created several types of piston pushing tools for disc brake assemblies. U.S. Pat. No. 5,018,261 to Markous (1991) discloses a tool that requires manual manipulation as the tool is applied because the tool slides over and does not hold the position and has a tendency to damage the rubber housing around the piston. U.S. Pat. No. 4,903,391 to Franks (1990) requires more time because you have to advance the tool completely into the cylinder because there is no piston abutting means.
Thus, it would be desirable to provide a piston pushing tool of a simple structure which will be easily placed into the caliper housing and will push either a single piston or dual pistons until it is flush with the piston receiving bore without additional manipulation.
OBJECTS AND ADVANTAGES
(a) to provide a low cost manual mechanism that can be used to readily move a brake actuation piston or dual pistons from an extended position to a retracted position, to thereby facilitate the process of replacing worn brake pads with new brake pads.
(b) to provide a mechanism that does not have to be exactly placed in order to work.
(c) to provide a mechanism that is designed so that it can be used on a variety of different disc brake constructions.
SUMMARY OF THE INVENTION
The present invention solves all the problems discussed above by providing a piston pushing tool for use in disc brake assemblies having a caliper housing providing one or two piston receiving bore(s) in which a piston is reciprocally disposed. The bore is open at one end and closed at its opposite end, and an outboard shoe support bracket is spaced axially apart from the open end. The support bracket has axially outer and inner surfaces and an opening generally aligned with the bore(s). The piston is a hollow cylindrical piston with a first end adjacent the closed end of the bore, and a second end adjacent the open end of the bore.
The tool comprises a threaded shaft having a distal end, a proximal end, and an intermediate portion. The shaft is proportioned and designed to extend axially through the opening in the support bracket.
Means are attached to the proximal end of the shaft for rotating the shaft. Means, engaged on the intermediate portion of the shaft, are provided for abutting the axially inner surface of the support bracket. The tool further comprises means, engaged on the distal end of the shaft, for abutting the second end of the piston or pistons. Upon rotation of the rotating means the piston abutting means will be driven away from the axially inner surface abutting means, thereby pushing the piston or pistons fully into the piston receiving bore or bores.


REFERENCES:
patent: 3599311 (1971-08-01), Ellis
patent: 4672731 (1987-06-01), Taylor
patent: 4903391 (1990-02-01), Franks
patent: 5018261 (1991-05-01), Markous

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