192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1979-04-10
1981-06-16
Krizmanich, George H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 9, 74845, 188 67, B60K 4120
Patent
active
042732255
ABSTRACT:
Levelling systems (e.g., scrapers) are laser-controlled by use of a sending station emitting a rotating, pulsed, laser beam in a plane either horizontal or inclined relative to the horizontal and a receiving station at the scraper which has a mast carrying one or more sensors. The sensor signals either signal the operator to raise, lower or change the angle of the blade or control the blade by hydraulic or electric actuations. The same mast mounted on a scraper (with blade raised to inoperative position) or other vehicle may be used for surveying a field. It is necessary in either case to raise and lower the mast so that the sensor intercepts the laser signal. This has heretofore been done in various ways hydraulically, electrically or mechanically (e.g., worm drive). The present invention provides an electrically driven mast having a brake which opposes the tendency of other electrically operated masts to overtravel when descending, which tendency is attributable to the inertia resulting from the weight of the moving elements of the mast. The brake releases when the mast is being raised.
REFERENCES:
patent: 2372196 (1945-03-01), Grime
patent: 2449773 (1948-09-01), Hargreaves et al.
Caplan Julian
Krizmanich George H.
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