Appeal No. 2005-0661
Application No. 09/894,480
Heath also discloses an alternative embodiment, shown in
Figures 17 and 18, wherein the actuator arm pivot or rocker
assembly is provided as a separate unit:
[t]he rocker assembly for the actuator arm may be
provided in a cartridge as shown in FIGS. 17 and 18.
The cartridge assembly is formed as a separate unit 30
as shown in FIG. 18 and in this example is of generally
cylindrical form. It is arranged to be a close fit in
a circular aperture 33 in the actuator arm 9. Similar
reference numerals have been used in FIGS. 17 and 18 as
were used for corresponding parts of the embodiments
shown in earlier Figures. The cartridge 30 has a
part-circular body member 31 that fits closely against
the wall of aperture 33 in the arm 9 and is fixed to
rotate with the arm. A screw 39 passes through the arm
9 into a threaded hole 38 in the body 31 so as to
secure the arm to the cartridge so that the arm 9 and
body 31 move together as the arm rotates. The pillar 4
of the cartridge 30 is attached to the base 1 by means
of a screw 36 which is housed in a counterbored hole 35
in the pillar 4 and screwed into the base 1. In this
way the cartridge is secured to the base 1 with the
pillar 4 held in a fixed position relative to the base
1. A part-circular retainer 32 forms a housing around
the side of the cartridge remote from the body 31 and
the body 31 and retainer 32 mate together to form a
cylindrical cartridge fitting closely within the
aperture 33. Both the body 31 and retainer 32 have
shoulders 37 formed by a projecting flange at the lower
end of the cartridge. Together they form a continuous
shoulder which is close to the base 1 and a well
defined distance from it. The lower surface of the arm
9 is biased onto contact with the shoulder 37 when
assembled to ensure that the distance between the arm 9
and the base 1 is accurately defined. The spring 21
engages part-circular projections 22 and 23 in a manner
similar to that already described with reference to
earlier Figures [column 7, lines 27 through 57].
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