Brakes – Wheel – Axially movable brake element or housing therefor
Reexamination Certificate
1998-03-31
2001-08-07
Graham, Matthew C. (Department: 3613)
Brakes
Wheel
Axially movable brake element or housing therefor
C188S1960BA
Reexamination Certificate
active
06269914
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an arrangement for disc brakes used on motor vehicles.
BACKGROUND OF THE INVENTION
One problem associated with one commonly used brake system for e.g. heavier vehicles is that the actuating means, which alter the brake pad units between braking and released positions, have end sections which, during certain conditions e.g. during adjustment for the gradual wear of the brake pad units, are affected by torsional forces, which can result in damage to e.g. covering boots and the like with the accompanying deterioration of their function as dirt protection sealing means.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an arrangement with which it is ensured that the sealing means of the actuating means can maintain their protective function during a longer time and to therewith reduce the need for service and the risk of brake failure.
Said object is achieved by the arrangement according to the present invention, comprising a first tappet section and an extendible tappet section, the extendible tappet section being extendible in relation to the first tappet section for movement into an active position, and a member connected to the first tappet section and being engaged with the extendible tappet section so that the extendible tappet section is non-rotatably held. Preferably, the first tappet section is rotatable and has a first axial bore therethrough. The extendible tappet section may be telescopingly received within the first axial bore so that rotation of the first tappet section axially extends the extendible tappet section. The first tappet section may be threadably engaged with the extendible tappet section.
The extendible tappet section preferably has a groove extending therethrough for receiving the member, the bore and the member having cross-sectional shapes which interact so that the extendible tappet section is non-rotatable.
Preferably, the first tappet section includes a plate to which the member is secured, the member being adapted to convey a force to the tappet assembly for effecting movement into the active position. The first tappet section may also include a portion for preventing further extension of the extendible tappet section. The first tappet section and the extendible tappet section may be threadably engaged and the portion on the first tappet section may comprise an unthreaded surface on the first tappet section.
Preferably a seal is provided between the first tappet section and the extendible tappet section.
Another aspect of the invention is a tappet assembly for a disc brake device for motor vehicles, comprising a first tappet section and an extendible tappet section, the extendible tappet section being extendible in relation to the first tappet section for movement into an active position, and rotation-locking means for maintaining the tappet extension in a non-rotatable position, the rotation-locking means being connected to the first tappet section. This aspect of the invention may include the additional features discussed above.
In another aspect of the present invention, a disc brake device for motor vehicles comprises at least one brake pad unit, at least one tappet assembly movable within a caliper for moving each of the at least one brake pad units to an active position, the at least one tappet assembly including the features discussed above.
REFERENCES:
patent: 5379867 (1995-01-01), Macke et al.
patent: 5520267 (1996-05-01), Giering et al.
patent: 5568845 (1996-10-01), Baumgartner et al.
patent: 5833035 (1998-11-01), Severinsson
patent: 0 566 009 A1 (1993-10-01), None
patent: 2 426 182 (1979-12-01), None
patent: 93/21454 (1993-10-01), None
patent: 93/22579 (1993-11-01), None
patent: 93/24762 (1993-12-01), None
patent: 94/21936 (1994-09-01), None
AB Volvo
Graham Matthew C.
Lerner David Littenberg Krumholz & Mentlik LLP
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