10KN Rated Load R570 Bend Radius Four Sheave Combined Block with 4:1 Mechanical Advantage for Heavy Lifting

Four Sheave Combined Block for 4:1 Lifting and Pulling

The four sheave combined block is a single integrated unit that turns a modest winch pull into a controlled heavy lift. With four sheaves on one frame it produces a 4:1 mechanical advantage, so a 10KN rated unit can move loads that would otherwise need a crane or a much larger crew.

Design Features and Field Benefits

• 4:1 Advantage From One Frame: Four sheaves in a single block replace a multi-block tackle, reducing rigging time and the number of connection points that must be inspected.
• R570 Bend Radius Protects Rope: A large bend radius keeps rope fatigue low across repeated lifts, extending rope life and maintaining breaking strength.
• Controlled Load Movement: Because the load travels only a quarter of the rope distance, operators get finer control for alignment and soft landing of heavy equipment.
• Compact Footprint for Confined Sites: At 760x120x480mm the unit fits into substation trenches and tower bases where a crane cannot set up.

Four sheave combined block

Dimensions and ratings are nominal. Confirm the exact model against the datasheet before ordering.

Product Overview

All four sheaves run on one common frame with a 760mm outline and an R570 bend radius, which keeps rope stress low and allows the use of larger diameter rope. Because the load moves a quarter of the distance the rope is pulled, positioning is slower and more controlled, which is exactly what is needed when lowering a transformer onto a foundation or aligning a tower section.

Typical Applications

• Transformer and switchgear lifting
• Prefabricated tower section assembly
• Heavy conductor reel handling
• Confined substation lifting work

Selection Guidance

• Confirm the rope diameter and length needed for the 4:1 reeving; the rope length must be four times the lift height.
• Check the anchor and shackle ratings against the load, not against the block rating alone.
• Use a qualified rigger to set the reeving and inspect the rope before each lift.

Quality Control and Delivery

Units are assembled in an ISO 9001 certified workshop. Frames are checked for sheave alignment and axle straightness, load bearing parts are inspected before assembly, and finished units are function checked before packing. Export packing is a plywood case with a moisture barrier, and a 12 month warranty covers manufacturing defects. Inspection records and, on request, third party load test certificates can be supplied with the shipment.

Frequently Asked Questions

For project specific configurations, drawings or inspection requirements, send the conductor size, rated load and destination port with your enquiry.