Pen drive device gruas, perfected

摘要

Drive device jib cranes, perfected, wherein being actuatable by conventional, comprises a drum whose central body mounted on a housing is rolled or unrolled cable raising or lowering of the load, depending on the direction of proviniente rotation an ideally electric motor, which can also feed power otherwise, and on equipping a displaceable subassembly vertically constituted by two coaxial pulleys, one trapezoidal and the other facing respectively friction to respective pulleys nature coupled to the engine and that also mounts a drive gear to drive drum, a wheel brake and the same brake pads required in antagonistic but attack cam.