Theatre Design & Technology - Summer 1988 - 35

Tec~nical Report
Fred M. Wolff, editor

Pneumatic Jacks
BY ALLAN FANJOY

hat do you do when a structure must be moved and casters do not provide adequate
stability? If money is no object, air casters can do the job.
Another possibility is to rig a mechanicallift jack to lever casters into place.
If you want to strike a middle ground
with respect to elegance and expense,
perhaps pneumatic jacks are the answer. I used them successfully to
change the configuration of the audience seating in a makeshift theatre
space. Each seating section was about
12' x 40' and each weighed about 1200
pounds. They were the right shape but
in the wrong place for a particular
show. Considerable time and effort
could be saved if they could be moved
without disassembling them by lifting
them and setting them on dollies. My
solution was to reverse that processfirst set the dollies, then lift the unit.
Two to four pounds of air pressure
per square inch is not much, but over
an area of several square feet it can
quickly add up to more than a ton.
How many scene shops are equipped
to build an adequate airtight cylinder
and piston? All of them. The airtight
part is a used truck inner tube. 1 paid
$5.00 for each of them. The "cylinder"
is a 2' x 4' platform framed with
2 x 4's and decked with %" ply. The
piston is a plate of IN ply which fits
inside that frame with W' clearance on
all sides.
Frame the platfonn cylinder first.
Let the short dimension follow
through the long one for maximum
strength since the tube will exert
more pressure on the sides than the
ends. As hard as nails are to pullout,
they are harder to shear off. Attach the
deck and cut a W' ply plate to slip
inside the frame. Bolt at least three
casters to this "piston" with the nuts

W

Piston. tube. and
cylinder ready for
final assembly.

Shape of tube
accommodating to
cylinder.

Assembled
pneumatic jeck.

(not the bolt heads) on the castered
face. Lay the inner tube onto this plate
and drill a hole so that the valve stem
can pass through near the center. Lay
the tube into the inverted cylinder and
set the piston on top with the valve

stem through the center hole. Screw a
couple of battens to the underside of
the frame to trap the piston inside.
Thus, the jack will not come apart
when you carry it about, nor will an
edge of the tube protrude if you should
TD&T * SUMMER 1988

33



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1988

Contents
Theatre Design & Technology - Summer 1988 - 1
Theatre Design & Technology - Summer 1988 - 2
Theatre Design & Technology - Summer 1988 - 3
Theatre Design & Technology - Summer 1988 - Contents
Theatre Design & Technology - Summer 1988 - 5
Theatre Design & Technology - Summer 1988 - 6
Theatre Design & Technology - Summer 1988 - 7
Theatre Design & Technology - Summer 1988 - 8
Theatre Design & Technology - Summer 1988 - 9
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Theatre Design & Technology - Summer 1988 - 12
Theatre Design & Technology - Summer 1988 - 13
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Theatre Design & Technology - Summer 1988 - 18
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Theatre Design & Technology - Summer 1988 - 20
Theatre Design & Technology - Summer 1988 - 21
Theatre Design & Technology - Summer 1988 - 22
Theatre Design & Technology - Summer 1988 - 23
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Theatre Design & Technology - Summer 1988 - 28
Theatre Design & Technology - Summer 1988 - 29
Theatre Design & Technology - Summer 1988 - 30
Theatre Design & Technology - Summer 1988 - 31
Theatre Design & Technology - Summer 1988 - 32
Theatre Design & Technology - Summer 1988 - 33
Theatre Design & Technology - Summer 1988 - 34
Theatre Design & Technology - Summer 1988 - 35
Theatre Design & Technology - Summer 1988 - 36
Theatre Design & Technology - Summer 1988 - 37
Theatre Design & Technology - Summer 1988 - 38
Theatre Design & Technology - Summer 1988 - 39
Theatre Design & Technology - Summer 1988 - 40
Theatre Design & Technology - Summer 1988 - 41
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Theatre Design & Technology - Summer 1988 - 68
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