Doughty Triple Sheave Pulley

Doughty Triple Sheave Pulley

The Doughty Triple Sheave Pulley is a modular, high-performance pulley system designed for use in the theatre, film, and television industries. Built from standard components, this pulley system allows for easy and efficient assembly to meet a variety of rigging and lifting requirements. The triple-sheave design enhances mechanical advantage, making it easier to lift heavy loads with reduced effort. Compatible with both fiber and wire ropes, the Doughty pulley ensures versatility and reliability in demanding environments.

Available in three distinct sheave diameters—4'', 6'', and 7''—each pulley maintains a consistent width of 3.3'' and a safe working load (SWL) of 331 lbs. The sheaves are constructed from durable nylon and run on a plain shaft without ball-raced bearings, ensuring a robust and low-maintenance solution. Designed with industry standards in mind, Doughty Triple Sheave Pulleys are ideal for applications requiring secure and adaptable lifting solutions.

Whether you're a stage technician, rigging professional, or production engineer, the Doughty Triple Sheave Pulley offers the strength, safety, and flexibility needed for complex lifting tasks.

Downloads:

User Manual

Key Features:

• Modular design for easy assembly from standard components
• Triple-sheave configuration for enhanced mechanical advantage
• Compatible with both fiber and wire ropes
• Suitable for theatre, film, and TV rigging applications
• Durable nylon sheaves on a plain shaft without ball-raced bearings

Specifications:

• Sheave Dimensions: 4'', 6'', and 7'' Diameter
• Recommended Rope/Wire Sizes:
  - 4'' Sheave: 0.5'' Rope OR 0.16'' Wire
  - 6'' Sheave: 0.7'' Rope OR 0.24'' Wire
  - 7'' Sheave: 0.7'' Rope OR 0.24'' Wire
• Width: 3.3'' (same for all sizes)
• Safe Working Load (SWL): 331 lbs (same for all sizes)
• Pulley Type: Nylon sheave on plain shaft (no ball bearings)

References:

• Pulley vs. Sheave explanation and functional differences
• Triple-sheave pulley mechanical advantages and friction considerations
• Manufactured by Doughty Engineering, a PLASA and ESTA member since 1985

Doughty Engineering is a leading UK-based manufacturer of rigging, suspension, and lifting equipment for the entertainment industry. With a reputation for quality and safety, Doughty products are trusted by professionals worldwide.