General
Stage Equipment Terminology
Counterweight
Arbor—A device constructed
to hold counterweights, to counterbalance set. A multi-speed
arbor has a grooved sheave on top and one sheave at
the bottom. It is used when travel of arbor is restricted.
For every foot arbor travels the batten travels two
feet. Top
Counterweights—Weights
are grooved on ends to sliip between counterweight arbor
rods. The weight of each piece is known by the thickness.
1" thick equals approximately 17 lbs. 2" thick
equals approximately 35 lbs. These are 5" wide.
1'-0" high of counterweights equals approximately
204 lbs. Top
Floor
Block—A sheave to reverse the
path of a hand line on counterweight sets or curtain
track systems. Top
Hand
Lines—A 3/4" or 1"
manila rope used to move a rigging set or a 3/8"
cotton cord for a curtain on a track system. Top
Head
Block—A large sheave with corresponding grooves
for each lead line, and one groove for the hand line.
Top
Idler
Block—A sheave sometimes known
as a mule block. Used to divert the path of the cable
line(s). Top
Lead
Cables—Cables that are connected
to the pipe batten and run up and over the loft blocks,
across to the head block and down to the arbor. Top
Loft
Block—Usually a smaller sheave with one groove
for a lead line cable. Top
Motorized
Sets—This system is operated
by a properly sized, electrically powered winch. These
units are custom built for your lifting requirements.
Top
Pipe
Batten—A 1 1/4" to 1 1/2"
pipe used to hang drapes, tracks, lights, scenery, etc.
Top
Rigging
Set—
Head Block (multi-grooved) - Loft blocks (single grooved)
Floor Block
(groved for hand line)
Rope Lock (with safety ring)
Counterweight Arbor (with weights)
Lead Cable
Hand Line
Pipe Batten (with trim chain)
T-Bar Guides (T-Bar system only) or Guide Cables (wire
guide system only)
Winches (winch set only) Top
Rope
Lock—A safety device used to clamp hand line
to insure nonmovement of set(s). The safety ring is
designed to keep the rope lock from accidentally being
opened. Top
Tee
Bar System—A system of T-Bars
placed close together to form guide tracks. Used for
counterweight arbors and floating type floor blocks.
Top
Trim
Chains—Short chains with snaps and safety bolts
connected at battens are used to level pipes and scenery.
Top
Winch
Sets—This system is operated
by a hand winch instead of a counterweight arbor. Usage
is restricted on stage areas. Top
Wire
Guide System—A pair of cables placed for guides
on a counterweight arbor, instead of T-Bars. Top
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