Even in the brute force world of construction and maintenance equipment, does one find subtleties of design. An aerial basket doesn’t simply move the worker up and down to his task—an operator must also be able to shift from side to side to minimize the dangerous temptation of reaching beyond safe limits.
To accomplish this designers have traditionally used a simple arrangement of a cylinder bridging between a frame member and a corner of the element being pivoted. Problems with this design arise from the space the cylinder occupies, as well as the exposed area of the cylinder. A solution is now offered with the robust L20 series of rotary actuators from Helac Corp, Enumclaw, WA. Designed for 3000 psi max. applications, the devices are presently offered in five sizes, providing for output torques ranging from 4500 to 39,000 in.-lbs. Standard range of rotation for all units is 180 degrees. The actuators are also compact—the largest unit in the series measures 13.5- x 13- x 9.66-in.—enabling
installation in a wide range of applications.
A key element in the L20 Series is an internal sliding spline configuration that converts linear piston motion into shaft rotation. A double helix arrangement of splines compounds the rotation from the piston, and the multiple splines provide additional strength and durability. Even distribution of loads across the teeth also makes the L20 Series highly resilient to shock loads. This design also eliminates the unbalanced forces that are inherently characteristic in systems like rack-and-pinion actuators.
Zero-leakage seals have eliminated internal bypass and external leakage, assuring positive performance while permitting selected positions to be maintained without drift. Compact, direct-mounted, integral counterbalance valves are offered as a factory-installed standard item. The large-diameter shaft flange, with a drilled and tapped bolt circle, permits loads to be securely attached directly to the actuator. The shaft also features a hollow bore that reduces weight and facilitates the routing of hoses and electrical wiring.
—RM
For more information:
Circle 180—Helac Corp, or connect directly to their website via the Online Reader Service Program at
www.RSLeads.com/?111df-180
Circle 181—JLG Industries, Inc, or connect directly at
www.RSLeads.com/?111df-181
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To accomplish this designers have traditionally used a simple arrangement of a cylinder bridging between a frame member and a corner of the element being pivoted. Problems with this design arise from the space the cylinder occupies, as well as the exposed area of the cylinder. A solution is now offered with the robust L20 series of rotary actuators from Helac Corp, Enumclaw, WA. Designed for 3000 psi max. applications, the devices are presently offered in five sizes, providing for output torques ranging from 4500 to 39,000 in.-lbs. Standard range of rotation for all units is 180 degrees. The actuators are also compact—the largest unit in the series measures 13.5- x 13- x 9.66-in.—enabling
installation in a wide range of applications.
Zero-leakage seals have eliminated internal bypass and external leakage, assuring positive performance while permitting selected positions to be maintained without drift. Compact, direct-mounted, integral counterbalance valves are offered as a factory-installed standard item. The large-diameter shaft flange, with a drilled and tapped bolt circle, permits loads to be securely attached directly to the actuator. The shaft also features a hollow bore that reduces weight and facilitates the routing of hoses and electrical wiring.