Theatre Design & Technology - Summer 1977 - 30

tion was a a right angle to the jacks so that the pipe sleeve
pivots would be tested under the most adverse conditions.
The wagon was loaded with stage weights which in combination with the estimated weight of the wagon approximated the 200 lb. load ratings of the casters employed.
The wagon was then moved back and forth over the
test course a total of 50 times or in other words for a total
of 100 passes. The clearance above the floor before and
after the test and the condition of the jack components
were noted. The results were encouraging. The minimum
clearance above the floor (under load) was 5/8" both
before and after the test. Visual inspection showed no
deterioration of jack components. The sole exception
was a slight loosening of the cables on the winch jacks
probably due to their seating more fully around the
holes in the caster plate. The only other failure observed did not concern the jacks but involved badly cracking the wheels of one of the casters. At this writing the
winch style caster jacks have been used in performance
situations with at least one run requiring well over a
hundred scene shifts and with estimated loads per caster
over twice that used in the tests just mentioned. The only
difficulty encountered has been the problem mentioned
earlier involving the cable occasionally binding over the
top of an anchor bolt. The Y:!" diameter extension eliminates the problem. Thus is would seem that these jacks
are at least as reliable as typical medium duty stage casters. It is probable that other technicians will devise variations that will further increase the load bearing capability

Fig. 12. Winch shaft handle lock.

a separate lock should not normally be required for the
cam operated jacks, the latter can be set more rapidly
than the winch type. Also it is probable that most stagehands would be more comfortable with the 90 0 motion
of the cam type rather than the 180 0 required by the
winch version.
TEST RESULTS
The author installed both types of jacks in a test wagon
in order to examine the durability of these designs. The
effects of a rough stage floor were simulated by causing
the wagon to roll across a series of five 3/8" thick wood
strips spaced approximately 12" to 18" apart. The platform was oriented in such a way that the direction of mo-

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SUMMER,1977

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FIG.13
CAM OPERATED
JACK

THEATRE DESIGN AND TECHNOLOGY

WAGON

I

USITT

I



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1977

Contents
Theatre Design & Technology - Summer 1977 - 1
Theatre Design & Technology - Summer 1977 - 2
Theatre Design & Technology - Summer 1977 - 3
Theatre Design & Technology - Summer 1977 - Contents
Theatre Design & Technology - Summer 1977 - 5
Theatre Design & Technology - Summer 1977 - 6
Theatre Design & Technology - Summer 1977 - 7
Theatre Design & Technology - Summer 1977 - 8
Theatre Design & Technology - Summer 1977 - 9
Theatre Design & Technology - Summer 1977 - 10
Theatre Design & Technology - Summer 1977 - 11
Theatre Design & Technology - Summer 1977 - 12
Theatre Design & Technology - Summer 1977 - 13
Theatre Design & Technology - Summer 1977 - 14
Theatre Design & Technology - Summer 1977 - 15
Theatre Design & Technology - Summer 1977 - 16
Theatre Design & Technology - Summer 1977 - 17
Theatre Design & Technology - Summer 1977 - 18
Theatre Design & Technology - Summer 1977 - 19
Theatre Design & Technology - Summer 1977 - 20
Theatre Design & Technology - Summer 1977 - 21
Theatre Design & Technology - Summer 1977 - 22
Theatre Design & Technology - Summer 1977 - 23
Theatre Design & Technology - Summer 1977 - 24
Theatre Design & Technology - Summer 1977 - 25
Theatre Design & Technology - Summer 1977 - 26
Theatre Design & Technology - Summer 1977 - 27
Theatre Design & Technology - Summer 1977 - 28
Theatre Design & Technology - Summer 1977 - 29
Theatre Design & Technology - Summer 1977 - 30
Theatre Design & Technology - Summer 1977 - 31
Theatre Design & Technology - Summer 1977 - 32
Theatre Design & Technology - Summer 1977 - 33
Theatre Design & Technology - Summer 1977 - 34
Theatre Design & Technology - Summer 1977 - 35
Theatre Design & Technology - Summer 1977 - 36
Theatre Design & Technology - Summer 1977 - 37
Theatre Design & Technology - Summer 1977 - 38
Theatre Design & Technology - Summer 1977 - 39
Theatre Design & Technology - Summer 1977 - 40
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