Brakes – Wheel – Transversely movable
Reexamination Certificate
1998-07-06
2001-08-21
Oberleitner, Robert J. (Department: 3613)
Brakes
Wheel
Transversely movable
C188S361000, C188S364000
Reexamination Certificate
active
06276500
ABSTRACT:
This invention relates to drum brake backplate assemblies which include a wheel cylinder mounted on an associated brake backplate.
Traditionally the wheel cylinders for such assemblies are manufactured by producing a cast wheel cylinder body and then subsequently machining the casting to provide an axially extending bore in which brake shoe operating pistons slide. The casting is also machined to provide a fluid inlet and a bleed port for the wheel cylinder and is then bolted to the associated brake backplate.
While such backplate assemblies operate satisfactorily they are relatively expensive to manufacture and require much machining and it is also a relatively time consuming operation to secure such cylinders to, or remove such cylinders from, the associated backplate.
It is an object of the present invention to provide a form of backplate assembly which is cheaper to manufacture than the known designs and in which it is easier to secure the wheel cylinder in its operating position on the associated brake backplate.
Thus according to the present invention there is provided a drum brake backplate assembly comprising a wheel cylinder mounted on a brake backplate, the assembly being characterised in that the wheel cylinder has a body which is shaped to cooperate with quick-attach means which locates the wheel cylinder relative to the brake backplate.
Preferably the quick attach means comprises a clip which engages a formation on the body to hold the body on the backplate.
Preferably also the body is provided with a mounting block which extends through an aperture in the backplate, the clip engaging a formation in the mounting block to hold the body on the backplate.
In a preferred construction the clip is a spring-clip of generally U-shaped form which engages a groove in the mounting block and a rear face of the backplate to hold a shoulder on the mounting block against a front face of the backplate.
In an alternative form of the invention the body is again provided with a mounting block and the clip is formed on the backplate and extends over part of the mounting block and an additional fastening means holds the mounting block under the backplate clip.
The wheel cylinder body is preferably of generally tubular form and is formed as a solid extrusion. Conveniently this extrusion may be formed from aluminium. The extrusion may include the mounting block for the wheel cylinder. The inlet and a bleed passage may both be provided in the mounting block.
The invention also provides a wheel cylinder for use in one form of the backplate assembly described above in which the wheel cylinder body is formed as a solid tubular extrusion which includes a mounting block having a shoulder for contact with the front face of the backplate and a groove therein for receiving the U-shaped spring clip which contacts the rear face of the backplate.
The invention also provides a wheel cylinder for use in the other form of the backplate assembly described above in which the wheel cylinder body is formed as a solid tubular extrusion which includes a mounting block shaped to fit under a clip formed on the backplate, the mounting block also carrying an additional fastening means for holding the mounting block under the clip.
The present invention will now be described, by way of example only, with reference to the accompanying drawings in which:
FIGS. 1 and 2
show longitudinal and radial sections through part of a backplate assembly which has a wheel cylinder manufactured from a length of aluminium extrusion, the wheel cylender being held on the backplate by a U-shaped clip;
FIG. 3
is a partial view in the direction of arrow A of
FIG. 1
;
FIGS. 4 and 5
are similar views of part of an alternative backplate assembly which has an alternative wheel cylinder produced from an aluminium extrusion in which the cylinder is held on the backplate by a clip and bolt arrangement, and
FIG. 6
is a view in the direction of arrow B of FIG.
4
.
REFERENCES:
patent: 2084388 (1937-06-01), Dodge
patent: 3200908 (1965-08-01), Budd et al.
patent: 4113073 (1978-09-01), Lusa et al.
patent: 4227594 (1980-10-01), Kluger
patent: 4269533 (1981-05-01), Mashiki et al.
patent: 4553647 (1985-11-01), Spaargaren
patent: 547826 (1942-09-01), None
patent: 606355 (1948-08-01), None
patent: 727 627 (1955-04-01), None
Hadley Clive Samuel
Peasley David
Automotive Products plc
Germain Lee A.
Milliken Paul E
Oberleitner Robert J.
Weber Ray L.
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