Draw works transmission control

Details Draw works transmission control Draw works transmission control

1979-05-02

1981-07-14

Krizmanich, George H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 12C, 138 31, 60413, 13759613, B60K 4124, F15B 102

Patent

active

042781558

ABSTRACT:
PCT No. PCT/US79/00293 Sec. 371 Date May 2, 1979 Sec. 102(e) Date May 2, 1979 PCT Filed May 2, 1979 PCT Pub. No. WO80/02446 PCT Pub. Date Nov. 13, 1980.
In a control (28) for a hydraulically operated draw works or the like having a hydraulically disengaged brake (14), a transmission (10, 12) and a brake control valve (114, 122), the improvement including an accumulator (174) having a check valve (196) connected between the brake control valve outlet (152) and the brake (14) to modulate the application of the brake (14) after the brake (14) has been fully released and to provide no modulation of brake (14) application after the brake (14) has been only partially released to thereby minimize shock in the draw works components when a load is lowered rapidly and yet provide rapid action when operated slowly.

REFERENCES:
patent: 3128861 (1964-04-01), Trondsen
patent: 3985063 (1976-10-01), Lemon
patent: 3991787 (1976-11-01), Schmitt
patent: 4048799 (1977-09-01), Golan

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