For use
in
a horizontal or near-horizontal position, a stand can be easily
fabricated from sheet steel,
as
shown
in
Fig.2.4.
2.6. PUSHRODS
Since
the
Type
4809
has a central
point
through
which
all
its force
is
directed and since it
is
usually
more
convenient
to
have
the
driving
point
a
short distance from
the
Exciter, a
pushrod
is
generally used
to
transfer
the
force. This can also be used
to
provide external
protection
for
the
Exciter.
The dimensions and stiffness of
the
rod can be designed
in
such a way
that
side loads and
moments
result
in
bending
of
the
rod
rather
than
rubbing
of
the
driver coil.
Fig.2.5 shows a
sketch
of
a pushrod
for
use with
the
Type
4809
Exciter.
The
two
halves are screwed
tight
to
the
Exciter
table
and
the
object,
then
locked
together
by means
of
four
center
screws.
5 mm Steel Rod Silver Solder
10-
32
UNF I /
~
~
-----'---__j]J----,(]Rt.29
.
5
mm
M3
Screws
c_l0
- 32
UNF
Fig.2.5. Pushrod
for
use
with
the Type 4809
Fig.2.6 shows a
pushrod
in
use
transmitting
force
to
a gas pressure meas-
uring device
in
the
laboratory
of
a
soft
drink
manufacturer. The gas measu-
ring
apparatus
and
bottle-holding jig are free
to
move horizontally
on
rollers and
the
pushrod
is
attached
to
the
entire
fixture
with a locking pin
which permits
frequent
removal
of
the
fixture.
9
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