Appeal 2006-2793
Application 10/829,536
is “limited” to a maximum of the predetermined threshold value at which the
piston diameter enlargement abuts the stop formed by the receiver diameter
reduction. Any force exceeding the predetermined threshold value will be
transmitted along a second force transmission path that bypasses the force
transducer. Appellant’s Fig. 4 embodiment works similarly except that the
predetermined threshold force value is reached when the piston 52 has been
displaced far enough to the left in the direction toward the force transducer
42 that the end face 78 of the piston 52 no longer projects beyond the ends
of receiver 40 and mounting 44 (Specification 13:10-25).
Rinsma is directed to actuators for disc brakes and seeks to alleviate
or circumvent the problems related to transverse or radial loadings on the
screw (Rinsma 1:20-28). Rinsma addresses this problem by providing a
resilient pressure pad 36, 53 through which the screw 24 and actuating
member (piston 35) engage one another to transfer the required actuating
force from the screw to the piston (Rinsma 1:28-31; 5:18-24). In Rinsma’s
Fig. 3 embodiment, the pressure pad 36, 53 has an internal space 52
connected to a measuring channel 51, which in turn is connected to a load
measuring device 50. The internal space 52 and measuring channel 51 may
be filled with a thermal oil that is resistant to high temperatures that may
result from friction between the brake pad 5 and brake disc 6 (Rinsma 6:3-
15). Rinsma describes the pressure pad 36, 53 as follows:
[I]ts stiffness in axial direction should be rather
high. In particular, the stiffness should be
maintained at a level where the required
force/displacement relationship still provides the
possibility to obtain the desired actuating force.
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Last modified: September 9, 2013