USITT 2017 Tech Expo Guide - Public - 48
Tech EXPO 2017
Exhibit No. 17 Improved Wagon Brake
By Shannon Perry and Tim Francis
Trinity University
F
or a recent production of The Three Sisters at
Trinity University, the set design included a
large wagon unit moved to different positions
on the stage for each act. Because of a vista scene
change, foot irons and stage screws were not
practical. We considered using four heavy-duty
wagon brakes, but were concerned that they
would not provide enough stability because of the
Figure 1
Figure 2
48
United States Institute for Theatre Technology, Inc.
limited stage floor contact area. We developed an
improved brake that makes contact with a larger
surface on the stage, thereby stabilizing the wagon
more effectively.
To create one improved wagon brake, we began
with two 800-pounds holding capacity push-pull
toggle clamps (Clamp-Rite 10030CR) purchased
on Amazon.com. These were spaced 6" apart center
to center, and the mounting plates of both clamps
were welded to a single piece of ¼"x 3"x9" plate
steel (Figure 1). To allow us to attach the brake
to the platform, we drilled through the existing
bolt holes of the clamp mounting plates through
the plate steel. In another plate of the same size,
we drilled two ⅜" holes 6" inches apart. We passed
two ⅜" hex head bolts through these holes, loosely
affixed them in place with nuts, and threaded these
bolts into the two welded toggle clamps. We chose
not to weld the bolts directly to the steel plate because we wanted to allow for potential adjustment.
If the nuts attaching the bolts to the plate are loosened, the bolts can thread into or out of the clamp,
allowing the plate to adjust up or down as needed.
The vinyl grips were removed and a length of
¾" steel square tube was welded between the clamp
levers to create a handle, making it easier to deploy the brake in one. Then, because the exposed
bolt heads underneath the plate caused the plate to
sit above the ground, we drilled two holes through
a piece of ½" plywood that were large enough to
accommodate a 9/16" socket. We attached this
plywood to the bottom of the plate using doublesided carpet tape (Figure 2), thereby ensuring that
the entire surface area of the plate would make full
contact with the stage without being impeded by
the bolt heads. The bolts could now be loosened
or tightened using a socket through the hole in the
plywood.
Ultimately, we have found that the increased
surface area from one improved wagon brake
yields far greater contact with the ground than the
base of a standard toggle clamp. The adjustability
of the design has proved useful because the brake
can be placed at any height on the edge of a platform, and can still be adjusted to solidly lock to the
ground. At a cost of around $40, we have found
this design to be a simple solution to the problem
of stabilizing wagons effectively.
http://www.Amazon.com
Table of Contents for the Digital Edition of USITT 2017 Tech Expo Guide - Public
Contents
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