Five spacer between the side plates, three of which prevent cables from escaping the sheave grooves
Pivot adapters (070-PIVOT) are available for single line 8" blocks used in applications where the mounting surface is sloped.
Underhung loft blocks may need to be welded to loft beams after final alignment - consult the factory for specific information.
Loft Block Idlers
Idlers may be added to underhung loft blocks to carry the weight of the cables and prevent rubbing against adjacent block side plates. They are not intended to carry line loads or to act as deflector or mule blocks.
Idler assemblies consist of one or two 3-1/2 inch diameter, 3 line Nylon sheaves mounted on the side of the loft block in a steel housing.
Idler sheaves have 1/4 inch cable grooves with a 3/8-inch shaft in a 12-gauge steel housing with two 1/4 inch bolts and pipe spacers to mount the housing and captivate the cables in the grooves.
When using idler pulleys, the loft block closest to the head block should be a full size multi-line block with grooves for all of the lift lines. This ensures that fleet angle and other alignment stresses are not transferred to the idler pulleys.
Loft Block Pivot Bracket
Pivot Brackets are required for mounting on loft beams with more than 1-1/2° of slope.
Use for beams 4" - 8-1/2" wide for single line 55 series blocks).
Mounting clips are included, please specify beam flange thickness
Pivot brackets must be welded to loft beams after final alignment - consult the factory for specific information
We can design custom blocks to meet your specific requirements.
Nylon, steel, or ASTM Class 30 grey iron sheaves are available.
Blocks may contain one or more sheaves. Sheaves can be mounted on a single axle or mounted in a tandem configuration for use in upgrading historic theaters and for use with drum hoists that must be mounted close to the head blocks.
Base angles or other mounting methods to meet your requirements.
Blocks may be mounted upright or underhung.
Blocks with three or more sheaves are constructed with the base angle legs turned in to allow close mounting centers. Base angles are notched to clear ropes and cables.
Nylon or ASTM Class 30 grey iron sheaves.
17mm sealed precision ball bearings.
12 gauge side plates located outside and between sheaves.
Australian owned and operated since 1969, Specialty Theatre has an extensive range of theatre supplies, theatre equipment, theatre fabric, stage curtain track, theatre winches and motors, and stage rigging equipment for almost any stage or theatre requirement.
We also supply theatre seating, theatre lighting, lighting bars and theatre safety equipment as well.
We have an expertly staffed sewing room to custom-make any kind of stage drapes, theatre curtains, or acoustic wall treatments.
Our technicians can design, source and integrate theatre audiovisual equipment like mixers, speakers and projectors into any venue. We are also install and service theatre digital signage systems.