Bottom Blocks

Bushman Equipment bottom blocks are designed for your specific application. Sheave configuration, capacity, special control requirements and unique reeving patterns can be incorporated to improve your crane operation.

The motor driven 360° rotating bottom block permits the crane operator to position heavy or awkward loads in less accessible work areas.

Standard non-motorized bottom blocks are available for retrofitting or modernization projects. They can also be manufactured in larger quantities for new crane installations.

All Bushman Equipment bottom blocks are designed and manufactured in accordance with CMAA 70 and 74 and AISE Spec 6.

Available in the Following Crane Service Classifications

A:  Standby or infrequent service
B:  Light service - to 5 lifts per hour, 50% of 
     capacity 
C:  Moderate service - to 10 lifts per hour, 
     50% of capacity
D:  Heavy duty service - high speed, to 20 lifts 
     per hour, 65% of capacity
E:  Severe service – high speed, over 20 lifts 
      per hour, 100% capacity
F:  Continuous severe service – production 
     critical, continuous service, 100% capacity

     AISE Spec. 6:  Mill duty rated, production
     critical, continuous service, 100% capacity

Standard Features of Bushman Equipment Bottom Blocks:

• Steel or forged sheaves
• Rotation control
• Welded steel construction
• Timken tapered bearings for smooth rotation
• Adjustable safety clutch for impact protection
• Forged hook with safety latch
• Lubrication fittings for hook and sheave bearings

Optional Features of Bushman Equipment Bottom Blocks:

• Mechanical rotation stops
• Electrical limit switch rotation control
• Push-button motor controls
• Remote controls
• Collector rings for power below the hook
• Solid state soft start
• Built-in weigh scale with integral or remote display
• DC drives
• Air motor rotation
• Clevis in place of hook
• Multiple sheave configurations
• Pin-type bail connection