Hoist drum drive control

Details Hoist drum drive control Hoist drum drive control

F - Mech Eng,Light,Heat,Weapons

15

B

138/41.16

F15B 9/16 (2006.01) B66D 1/44 (2006.01)

Patent

CA 1062990

ABSTRACT OF THE DISCLOSURE A hoist drum drive control is provided with both variable displacement and fixed displacement motors geared to the drum and connected in parallel to a variable displacement pump. During high speed hoisting the variable displacement motor is shifted to zero displacement until the back pressure reaches a certain level at which time the displacement is automatically increased until a balanced condition is achieved. When lowering heavy loads a feedback to the variable pump decreases its displacement to prevent over speeding the engine.

292016

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