Theatre Design & Technology - Summer 1977 - 29

OPTIONAL 1I2"DIA.x 3/4" L.
BOLT HEAD EXTEN~ONS(SEE TEXT)~----

LEGEND
1 3JS"CASTER PLATE-CHAMFER AS SHOWN
2 1-1/4" N.PS PIVOT SLE~VE
3 1" N.PS PIVOT SHAFT
41" N.PS. WINCH SHAFT
5 3/S"X 2" BOLT
6 1/S"D1AME ER AIRCRAF CAgLE (APPROX27")
71"X2-1/2"X1/S"SP.ACEKON CASTER PlATE (WELD)
S 3/S"X2ยท1/2" ANCHOR BOLTS - SE~ TEXT
91/4" DIAMETER HOLES - COUNERSINK
NOTE:SOME ITEMS OMI ED FOR CLAR!TY

5

2

BOTTOM

design. The winch jack is manifestly simpler to fabricate
since no offset is required in the caster plate. Further,
since no bends are required it is possible to use a much
heavier gauge plate. In the experimental jacks 3/8" thick
stock was used instead of the y.," thickness used for the
cam operated jacks. The use of the 3/8" thick stock also
meant the reinforcing plates were unnecessary thereby
further simplifying manufacture.
In addition to increased load bearing capacity the
winch type jacks offer several substantial operational
advantages. Since there is substantially no friction in
the cable winding, the very audible scraping sound of
the cam is eliminated. Even more important is the fact

Fig. 10. Winch shaft operated caster jack in the caster
down position. The spacer (bolted in this experimental
model) prevents possible crushing of cable between
caster plate and shaft. The spacer is item 7 of Fig. 9.

I

USITT

I

FIG.9

VIEW

WINCH SHAFT QPERATED
CASTER JACK

that since the caster plate is above the winch shaft, floor
clearance for the jacks ceases to be a concern. Another
ancillary advantage is that the caster assemblies don't
require separate restraint when the wagons are manually lifted off the floor. One of the minor annoyances
with the cam jacks is that the cam plates fall down and
hang below the platform when the latter is being carried
and there is often some difficulty in getting all the jacks
back in position as the wagon is lowered to the floor.
Some sort of restraint could of course be installed but this
is an extra operation which is obviated in the winch type.
Not all the advantages are with the winch jacks. Since

Fig. 11. Winch operated caster jack in the caster up
position (i.e., wagon down). Note bolts used as cable
anchors. Extensions on the heads of the anchor bolts
were not used in this experimental model but have been
found advisable. (see tex t)

THEATRE DESIGN AND TECHNOLOGY

SUMMER,1977

29



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
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