Theatre Design & Technology - Summer 1988 - 36
slightly overinflate it. To use the jack,
install whatever beams are suitable
between the legs of the object you will
move. Place these beams just close
enough to the ground that you can slip
the uninflated jack beneath them. Inflate the jack until the beams (and the
structure) have risen about 2" when
the piston has contacted the restraining battens. The pressure is so low that
I removed the valves from the stems
and merely sealed them with valve
caps to make them easier to lower.
Questions arose as to how powerful
such a jack actually is. There is some
uncertainty until we know just what
shape the tube assumes as it is inflated
inside the device. To investigate this I
temporarily replaced the piston with
1/.," mesh hardware cloth and admitted
just enough air to see how the tube
begins to accommodate to the shape of
the jack (see photo). Under negligible
pressure the tube bears on very little of
the 2' x 4' frame and on half of the
piston surface. If it were to spread no
further, then 4 psi across these 500
square inches would lift a ton. At
most, it could spread to completely fill
the enclosure. Then it would only require 2 psi to lift the same one-ton
load. This instance would result in the
maximum force against the 2 x 4
frame. An approximate 250-pound
stress would act on the long sides and
only about 125 pounds on the endswell within the limits of the joints and
materials involved. As an empirical
test we loaded one of the jacks with
1200 pounds of stage weights and indeed lifted them with less than 5 psi
air pressure. When the casters were
500 TO 'ILlS
SI;?_ 01.
~
Tv8E·
PI'5TON
~()A/rl1c"T
~
V
~ 12.5#STRESS ::>
-- (MAXIMVM)
2<'1 - FR AME ~==*~=~====~=~7t
INNER
TUBE
PNEUMATIC JACK
observed to leave noticeable impressions in our stage floor it was obvious
that whatever limits could be assigned
to the jack would exceed the likely
strength of the structures it might
move, the casters used, or the surfaces
it would cross.
Admittedly, it may be awkward to
supply the compressed air to make
scene changes a vista, and it takes several seconds to actuate the jack. But it
is powerful, sure, and inexpensive. It
also has the benefit that each pneumatic jack can be used on every object
with suitable beams installed,
whereas other devices are useful only
to the object for which they were
custom built.*
Allan Fanjoy is technical director at
the University of Delaware.
JOEL E. RUBIN &ASSOCIATES
Strategic Planners/Resource Specialists
Consulting Services to Facilities and Companies
for Performing Arts Technology, Marketing, and
Planning
119 WEST 57TH STREET SUITE 11. EW YORK, NEW YORK 10019, USA [212J 757-5646
34
TD&T * SUMMER 1 gee
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
Theatre Design & Technology - Summer 1988 - 10
Theatre Design & Technology - Summer 1988 - 11
Theatre Design & Technology - Summer 1988 - 12
Theatre Design & Technology - Summer 1988 - 13
Theatre Design & Technology - Summer 1988 - 14
Theatre Design & Technology - Summer 1988 - 15
Theatre Design & Technology - Summer 1988 - 16
Theatre Design & Technology - Summer 1988 - 17
Theatre Design & Technology - Summer 1988 - 18
Theatre Design & Technology - Summer 1988 - 19
Theatre Design & Technology - Summer 1988 - 20
Theatre Design & Technology - Summer 1988 - 21
Theatre Design & Technology - Summer 1988 - 22
Theatre Design & Technology - Summer 1988 - 23
Theatre Design & Technology - Summer 1988 - 24
Theatre Design & Technology - Summer 1988 - 25
Theatre Design & Technology - Summer 1988 - 26
Theatre Design & Technology - Summer 1988 - 27
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
Theatre Design & Technology - Summer 1988 - 42
Theatre Design & Technology - Summer 1988 - 43
Theatre Design & Technology - Summer 1988 - 44
Theatre Design & Technology - Summer 1988 - 45
Theatre Design & Technology - Summer 1988 - 46
Theatre Design & Technology - Summer 1988 - 47
Theatre Design & Technology - Summer 1988 - 48
Theatre Design & Technology - Summer 1988 - 49
Theatre Design & Technology - Summer 1988 - 50
Theatre Design & Technology - Summer 1988 - 51
Theatre Design & Technology - Summer 1988 - 52
Theatre Design & Technology - Summer 1988 - 53
Theatre Design & Technology - Summer 1988 - 54
Theatre Design & Technology - Summer 1988 - 55
Theatre Design & Technology - Summer 1988 - 56
Theatre Design & Technology - Summer 1988 - 57
Theatre Design & Technology - Summer 1988 - 58
Theatre Design & Technology - Summer 1988 - 59
Theatre Design & Technology - Summer 1988 - 60
Theatre Design & Technology - Summer 1988 - 61
Theatre Design & Technology - Summer 1988 - 62
Theatre Design & Technology - Summer 1988 - 63
Theatre Design & Technology - Summer 1988 - 64
Theatre Design & Technology - Summer 1988 - 65
Theatre Design & Technology - Summer 1988 - 66
Theatre Design & Technology - Summer 1988 - 67
Theatre Design & Technology - Summer 1988 - 68
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