C-Clamp (stagecraft)


In stagecraft, a c-clamp can refer to a number of different pieces of hardware, depending on its intended use.

Lighting and sound

In stage lighting and sound a c-clamp, also referred to as a pipe clamp, is used to attach a larger piece of hardware, such as a lighting instrument, a speaker, or a dimmer, to a pipe or batten. Newer c-clamps tend to be constructed of aluminum, although steel is also available.
C-clamps function by affixing a bolt to the hardware they are to hold in place, such as through the yoke of a lighting instrument, and securely fastening this bolt to the clamp shaft. The open end of the clamp is then placed over the batten, and a bolt is tightened to secure the c-clamp. C-clamps for stage lighting fixtures usually also have a pan screw, which when loosened will allow the clamp shaft, and therefore the fixture, to be rotated 360 degrees while maintaining a secure connection to the batten.
When using c-clamps care must be taken to not over-torque the clamp bolt which affixes the clamp to the batten. If this bolt is overtightened, it can easily dimple or "drill" into the batten seriously compromising the strength of the batten.

Parts

Film and television grips commonly make use of c-clamps that are manufactured specifically for their industry. These clamps are produced with integrated studs designed to accept the mounting hardware from a variety of small, lightweight lighting fixtures, allowing illumination to be placed in unusual or awkward locations quickly and easily.

Carpentry

s are commonly used in theatrical carpentry for the same purpose that non-theatrical carpenters employ them: for creating a quick, temporary, and non-destructive way of joining two objects together. Legs are commonly attached to platforms via c-clamp before they are fastened together using a more permanent method. Multi-platform assemblies are also commonly joined to one another solely with c-clamps, especially in touring situations where a set needs to be assembled and struck quickly.