HSB (High Speed Backstop) clutches are used on to prevent rotation in the opposite direction from the normal driving direction. When the fan drive is off, wind pressure from other fans or ambient breezes can apply sufficient force to rotate fan blades in the opposite direction. The HSB clutch allows the fan to freely rotate in the desired driving direction while preventing any rotation in the opposite direction.

Type RSCI is a centrifugal lift
off sprag type freewheel with
the inner race rotating. Only
the inner race is designed
for freewheeling. Primarily
designed as a backstop, this
type can be also used as an
overrunning clutch in crawl
drives, where the overrunning
speed is high but the driving
speed is low.

Bibbigard safety element torque limiters incorporate a number of safety element modules of a specific size mounted between two flanges and preset to release at a specified torque value in order to protect the drive system from expensive damage and lost production. They can be used with various types of drive medium many of which are available from Altra Industrial Motion. Bibbigard has been successfully utilized in many different industries where, subject to space availability, the release torque capacity is virtually unlimited.

•	Accurate release torque repeatability
•	Simple fast manual re-engagement
•	Low-cost maintenance
•	Versatile mounting capability

These units combine the best of both chain and belt drives, providing positive power transmission and accurate
speeds while requiring little maintenance. Load capacities scale up to 1200 HP at 1750 RPM.

Up to 600 kNm;
5,300,000 in.lb.

These torsionally stiff, light weight couplings are capable of transmitting high torques at high speeds while accepting significant levels of angular, radial, and axial misalignment. They are easy to install, suitable for hostile environments, require no lubrication and feature a high torque to weight ratio. Specific designs are available which meet the customer’s exact requirements. Standard units are compliant with API 671 (American Petroleum Institute) and ATEX 94/9/EC.

•	No maintenance
•	Standard and reduced moment designs available
•	Capable of being torsionally tuned to suit specific machinery requirements

Spring applied, electrically released caliper brakes

•	6 kN Braking Force
•	Modular
•	Controlled
•	Reliable
•	Easy maintenance
•	Self adjusting
•	Electronic monitoring
•	Self-adjusting

Up to 147 kNm;
1,300,000 in.lb.

Fully-crowned gear teeth
provide maximum contact at the strongest part of the tooth.

•	Models available for use on vertical and/or horizontal shafts
•	Bore capacity up to 510 mm
•	High torque to weight ratio
•	Half per half interchangeability

Up to 270 kNm;
2,400,000 in.lb.

Floating shaft couplings are specifically designed for long span applications from 24” to over 300”. Tru-Tube composite tubes (shown) can be specified for spans up to 220” (6 meters). Composite tubes weigh up to 80% less than steel and can eliminate the cost of bearing supports and other structures.

•	Horizontal or vertical applications
•	Custom designed to specification

Up to 270 kNm;
2,400,000 in.lbs.

Form-Flex metal disc couplings consist of two hubs, a spacer and two high strength carbon or stainless steel flexible discs. Modified and special designs
are commonly supplied to meet specific application conditions. Available in carbon steel, stainless steel or with corrosion resistant coatings.

•	No maintenance
•	Zero backlash
•	Close couple, spacer and floating shaft designs available
•	Easy interchangeability