Drum's new hand throttle
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DRUM ENGINEERING of Bradford has developed a pneumatic hand throttle designed to give a smooth power response in an immediate or remote installation.
The throttle works from an auxiliary air tank, which is brought into use when the power take-off is engaged. A warning light shows the operator that the system is ready to function.
When the control valve lever is operated, compressed air is fed into the slave cylinder which ac tuates the vehicle's own throttle lever via a 4.8mm (0.19in) diameter nylon tube which can be virtually any length.
Installing the control valve at the rear of a long vehicle or a semi-trailer is readily accomplished by quick-release air line couplings. The new throttle is said to be extremely smooth in operation because of a polypropylene sliding piston which requires no maintenance whatsoever. Response is therefore positive, with none of the snatching or engine speed drift associated with other designs.