Theatre Design & Technology - Summer 1977 - 28

LEGEND
'''N.P.S.<1.315 DIAl PIVOT SHA.FT
1-1f4"N.P.S.(1.C60 DIA.l PIVOT
SLEEVE
3/S"X2" MACHINE BOLT
SPACER WASHERS
PIPE CAP
'-1/4" N.PS. CAMSHAFT
1/2"X4"-SOUARE HEAD BOLTSHAPE LEADING EDGE OF
HEAD AS SHOWN
APPROXIMATE AVERAGE LIFT
HEIGHT 5/S"-3/4"
CAM PLATE: 1/4" THICK.

,
2
3
4
5
6
7

B

9

~

FILLET WELD BOTH SIDES

NOTE:SOME ITEMS OMITTED FOR
CLARITY

FIG.7
CAM OPERATED CASTER

BOTTOM

VIEW

~

WI TH PI PE SLEEVE
PIVOT

It has been found that the simplest way to achieve sufficient tightening is to leave one of each pair of anchors
not quite fully tightened and then force the operating
handle to within two or three degrees of the position
established by the handle lock thus slipping the cable
through the partially tightened anchor. All anchor bolts
are then fully tightened. The operating handle then has
to be forced slightly to the lock position which ultimately
seats the cable fairly well.
OPERATING HANDLES
The operating handle for both types of jacks are very
similar but require different types of stops. The basic
handle in both cases is ordinary Xl" x 1%" flat iron bar
stock bolted to a pipe flange, the latter then being threaded on to the actuating shaft (see Figure 9; bottom view!.
Experience has shown that it is important that the flange
be positively locked to the shaft either by pinning through

Fig. 8. Cam operated caster jack with pipe sleeve pivot.
28

SUMMER,1977

the flange and pipe or by some other means.
The "down" stops for the handles of both types of
jacks are not critical. A simple scheme is merely to allow
the pivot shaft to extend beyond the frame thereby acting as a stop. The "up" stops-i.e., the stops employed
when the wagon is up on casters-are more critical. In the
case of the cam operated jacks, the stops should be positioned so that the handles will allow the cams to move
approximately 5° to 10° beyond the top dead center position, i.e., approximately 95° to 100° of total motion.
This alignment will tend to make the cams self-locking.
The up lock for the winch style jack is slightly more
complicated since in this case the lock actually supports
part of the load albeit at moderate force levels. The most
convenient form thus far devised is to use an ordinary
3" butt hinge which ha~ been arranged with a stop to
limit its motion to approximately 90°. If when mounting
the hinge it is slightly angled with respect to the handle
in such a way that the natural force of the jack handle
tends to push the hinge toward its 90° stop, the possibility
of the jack handle releasing spontaneously should be
minimal. This lock with its stop mounted on the stationary part of the hinge is shown in Figure 12.
COMPARISON OF CAM AND WINCH OPERATED
CASTER JACKS
Generally speaking it would seem that of the two
forms, the winch operated jack is a more satisfactory

THEATRE DESIGN AND TECHNOLOGY

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
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Theatre Design & Technology - Summer 1977 - 40
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