DOUGHTY TRIGGER CLAMPS
Constructed from high-tensile aluminium extrusion, these innovative clamps fit standard lighting tubes from 48mm to 51mm diameter, for rigging a variety of stage equipment from lanterns to loudspeakers. The design offers the convenience of a standard hook-clamp, hooking over the bar and taking the weight of the attachment whilst the fixing wing-knob is tightened, yet does less damage to thinner walled tubing than the usual bolt fixing. The increased torque produced by the “trigger” aids positioning at non-vertical angles. SWL is rated at 200kg (5:1).
The basic trigger-clamp has a 12.7mm aperture for fixing luminaires, and a rebate to take a standard 12.7/12mm nut or bolt-head, preventing rotation. Various possibilities arise as a result for mounting loudspeakers, using Omnimount 30.0 series adapters, or threaded rods. See Index: Omnimount universal mounting systems. “Big-Ben” types are fitted with a TV Eurospigot adapter (28mm diameter, compatible with the majority of both DIN and BS types) to mount luminaires to bars, and may also be used to fix tubes to suitable stands. For safety accessories see index: Safety Bonds.