STD-AT Air Tractor Drive

Powered Drive For Bridge Cranes

The STD-AT (Air Tractor Drive) is a friction wheel travel drive that moves a load along a bridge crane rail. The air tractor drives may be used to drive a hoist along a bridge, a bridge along a runway, a hoist along a monorail or a carriage along parallel rails. Unlike many friction wheel drives, the Air Tractor Drive is pneumatically powered and operated.

The air tractor drive has a very high power density and is able to drive up to a 2000 lbs load along a level runway. The air motor provides high stall torque and can reverse direction nearly instantaneously.

Disengageable Tractor Drive

The force holding the tractor drive to the rail (the “tractive force”), is provided by an air cylinder. The air tractor drive can be disengaged from the rail remotely so that the load may coast freely if required. A regulator may be fitted before this cylinder to limit the tractive force of the drive (it is usually desirable for the tractor drive to slip when it encounters an obstacle).

The air tractor drive works with most brands of enclosed track including KBK/KLH/ALU. The air tractor drives can also accommodate curved sections in most enclosed track.

Tractor drive controls on hoist pendant

Applications

Moves any hoist along a bridge
Moves any bridge along a crane
Can be synchronized to an assembly Line (requires additional components)
'Return to Home' Function (requires additional components)
Ideal for trolley mounted, ergonomic lift assists (such as a manipulator)
Can be used to propel loads where operator effort would be too great. Air tractor drives can be installed in tandem to move even heavier loads

Features

Anodized aluminum chassis
Air driven / operated, air motor provides full torque at stall
Fast response, near instantaneous reversal of direction
Integrated wheel/gearbox results in a compact package
Drive wheel can be disengaged from the rail remotely
Works with I-beams, most brands of enclosed track (KBK, ALU, KLH). Non KBKII & IIL rails may require extra trolley adapters
Standard functions: Forward, Reverse, Automatic drive wheel engage/dis-engage, Manual drive wheel engage/dis-engage override. Control pendant available, but not included

Specifications

Drive Force @ Max Velocity	140 lbs @ 3.6 ft/sec (100 psi)
Drive Force @ Max Torque	190 lbs @ 0.4 ft/sec (100 psi)
Air Consumption @ Max Velocity	30 cfm
Maximum Operating Pressure	100 psi
Mass	62 lbs

Dimensions

(Click to enlarge image)

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