Theatre Design & Technology - Spring 2007 - 45

PNEUMATIC LOCKING CASTERS

PHOTO: BILL BROWNING

by Chris Fretts
Indiana Repertory Theatre

The primary scenic element for a production of Huckleberry
Finn, designed by Rob Koharchik, was a 10´x10´ raked wagon
that could pivot around a fixed corner to serve as a variety of
locations required by the play. The wagon needed to move easily-it was to be moved by the actors playing Huck and Jim,
with poles, when they were on the raft in the Mississippi-but
it also needed to be solidly anchored for the land-based scenes.
The pivot point was the center of the stage with the audience
in the round. It was decided that the actors could lock and
unlock the wagon if the process was simple and quick. My first
thought was an air-powered system so a discreet switch could
trigger the entire locking mechanism. I could put an air supply tank onboard and not have to worry how I would deal with
making the unit revolve more than one revolution and not foul
or tangle the air lines. I first considered using air-lift casters we
had in stock but had to eliminate that idea because of the clearance under the raked wagon. I also considered some kind of
friction pads pushed to the floor that would hold the wagon in
place. I finally decided on a simple friction brake that applied

THEATRE

44

DESIGN

&

TECHNOLOGY
SPRING

2007

pressure directly to several of the fixed casters themselves. It is
a simplified version of a car's disc brakes. I figured I would not
need to put a brake on all the casters to effectively hold the unit
in place. Unlike the air-lift casters or the friction pads, this solution would not cause any visible movement in the unit as the
brakes were applied. I also thought I had major parts necessary
to build these units in stock.
The design was based on a 3-1/2˝ rubber tired fixed caster
and a 3/4˝ bore x 1˝ stroke pancake double-acting pneumatic
cylinder. If I were not trying to use components I already had, I
could have used a single-acting air cylinder and used the spring
return for removing the pressure on the caster and simplified
the plumbing. A piece of flat stock steel was used as a base and
a piece of angle iron was used for a cylinder mounting. A wood
block cut to the caster radius served as a brake pad bolted to
the end of the cylinder rod. A simple U-shaped metal guide
welded to the base kept the wood block in line with the caster.
In testing we found that about 40psi air pressure kept the caster
from rolling. One further refinement was the addition of several



Table of Contents for the Digital Edition of Theatre Design & Technology - Spring 2007

Contents
Theatre Design & Technology - Spring 2007 - 1
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Theatre Design & Technology - Spring 2007 - Contents
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