Theatre Design & Technology - Summer 1977 - 31

shou ld th is become necessary.
A "WAGON JACK"
Another wagon stabilizing device has also found widespread application here at I.U. In contrast to the shaft
operated devices described previously, this is an accessory
u nit and therefore can be readily attached to already
existing wagons. Therein also lie its principle difficulties:
(1) in many situations it may be difficult to conceal the
hardware while preserving operational access; (2) since
this is an accessory it is usually not possible to make it as
structurally integral to the wagon frame as was the case
with the shaft operated caster jacks. Thus, it is not usually
possible to transfer the weight of the wagons totally from
the casters to the frames with a consequent reduction in
stability. In addition, as mentioned below, readily available materials may limit the precision possible in con·
structing this device. Nonetheless, in moderate vibration
situations builders may find the following device preferable. For clarity, this device can be termed a "wagon
jack" since it works on the wagon frame rather than
the caster.
The wagon jack is essentially a cam operated barrel
bolt (Figures 13 and 14). The "bolt" in this device is a
length of '%" diameter round bar stock. The floor end of
this core piece is given a blunt point (by turning or grinding) which allows it to dig into the stage floor slightly.
The sleeve is '%" N.P.S. pipe. One side of this sleeve has a
slot approximately 13/32" wide which is inclined to the

Fig. 14. Cam actuated wagon jack in the caster up (wagon
locked) position. The basic devices have been modified
several times for various special applications.

axis at 60°. The ends of the slot are terminated with %"
diameter holes. Even though the slot is not a true helix,
the form shown is functionally satisfactory and is far
easier to fabricate requiring only a hack saw and drill
press. Nonetheless the 3/8" bolt that serves as the cam
follower is subjected to considerable stress and thus a

5

2
3
4

5
6

3
4

7
)------jc+---~

LEGEND
CLEARANCE HOLE IN
PLA TFORM LID
LID
PLATFORM FACING
3/8" BOLTS
t='LATFORM F~AME
SLOT APPROX. 7/16'x3-1!2"
1I8"x1/2'x1" FLAT BAR
STOCK - WELD TO HANDLE SLEEVE ONLY

FIG.15
WAGON JACK
TELESCOPI 'G

I

USITT

I

THEATRE DESIGN AND TECHNOLOGY

SUMMER. 1977

WiTH
HANDLE

31



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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