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Stage Terms
A-F
G-L
M-R
S-Z
Gearmotor – The combination of a gearbox and motor in a single unit. The motor may also incorporate a brake.
Gridiron (Grid) – An open floor, usually made from light steel channels or grating, that is locates near the roof steel. It provides mounting locations for rigging equipment and access to that equipment for inspection and maintenance.
Guide – To control the movement of rigging devices by means of slides or rollers moving in tracks or on stretched cables.
Guide Shoe – A device attached to a counterweight arbor or tension block to engage guide rails and control the movement of the arbor,
Guide Rails – Components that confine and control the movement of counterweight arbors and tension floor blocks. See “J-Guide, A-Guide, Lattice Track, T-Guide, and Wire Guide.”
Hand Line – A line, usually rope, that is pulled by hand to lift or control the movement of a load.
Head Block – A pulley mounted to support steel that changes the direction of lift and operating lines between the loft blocks and an arbor or winch.
Head Block Beams – Structural framing designed to support the head blocks and all related loads. Usually consisting of one or two beams and associated bracing members.
Hemp Rigging (Rope or Spotline) - A rigging system that employs ropes and sandbags instead or counterweight arbors or other devices. Usually used for temporary rigging.
Hoisting Machine – A powered machine used for raising, lowering, and holding objects.
House – See “Auditorium.”
House Left/Right – The sides of an auditorium as seen by an audience member while facing the stage.
Idler – A pulley designed to support one or more cables but not to make direction changes.
Incremental Block – A multi-grooved pulley that supports and changes the direction of cables between the load and the head block and that supports other, more distant, lines in the set.
Index Light – A series of lamps in a special housing designed to illuminate the locking or pinrail area.
Index Strip – A device located at the front of a locking rail to hold line set identification labels.
J-Guide – J-shaped aluminum members fixed in parallel rows for the purpose of guiding arbors or clews.
Lattice Track – A parallel pair of angles or other structural members that guide an arbor or clew. Low friction slides or roller guides are placed on both sides of the device to be guided.
Lead Line – See “Lift Line.”
Leg, Tormentor or Wing Curtains – A curtain used to define the side limit of the stage and to mask or hide actors, lights, and unused scenery in the off stage area
Lift Line – Any rope or cable located between a load and a winch or counterweight arbor.
Lighting Bridge – A walkway across the stage (fixed or flown) where lights are hung and where they may be adjusted and maintained.
Line Set – A system consisting of one or more lift lines and related components operating together to lift, lower, or suspend or a load.
Line Shaft Winch – A winch with a series of cable drums connected to a gearbox by a common shaft.
Live End – The end of a rope or part of a device that is active or load carrying.
Live Load – That part of a system that may be added or deleted (i.e., lights hung from a pipe batten.)
Load Brake – A secondary brake that holds the full load in the system, usually in the case of a failure in the system.
Loading Gallery (Loading Bridge) – A gallery above with stage floor where technicians add and remove counterweights from the arbors. Usually located so technicians have access to arbors when battens are at their lowest position.
Loading Rail – A structural railing designed to support rope locks in a way that allows them to be safely operated. It carries any out of balance loads from the rigging system held by rope locks.
Locking Collar – A fastening device located on the counterweight arbor rods above the upper spreader plate and counterweights and intended to help keep the weights in the arbor during a hard impact.
Loft Block – A pulley mounted to the gridiron or support steel that supports and changes the direction of a lift line cable between the load and the head block.
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