Tool driving or impacting – With means to adjust position of axis of tool advance – Adjustment powered by motor or mechanism
Patent
1976-04-05
1978-07-18
Staab, Lawrence J.
Tool driving or impacting
With means to adjust position of axis of tool advance
Adjustment powered by motor or mechanism
188170, 192 3N, 212 39B, 212 66, E21C 500
Patent
active
041009738
ABSTRACT:
A brake release arrangement by which damage which otherwise would result from the application of excessive side loading to rotating equipment such as the boom of a digger derrick or crane is avoided. The drive system for rotating the boom includes a hydraulic motor, a non self-locking speed reducer and a spring applied, hydraulically releasable brake. Included in the brake release mechanism is a line which taps into the hydraulic line leading to the power equipment mounted on the boom and whose operation develops side loads. An adjustable pressure reducing valve in the tap line provides a fluid output at a reselected pressure to a small chamber in the brake housing. The pressurized fluid in the chamber acts on a piston which, when the side loading on the boom is great enough to cause damage, partially relaxes the brake force thus to permit slippage and back drive of the speed reducer and motor thereby to relieve the side load torque.
REFERENCES:
patent: 3315820 (1967-04-01), Stauffer
patent: 3396852 (1968-08-01), Balogm et al.
patent: 3499543 (1970-03-01), Updegrave
patent: 3690387 (1972-09-01), Dixon
Altec Industries, Inc.
Staab Lawrence J.
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