IMPROVEMENTS ON HOISTING MACHINES

PERFECTIONNEMENTS AUX ELEVATEURS

Claims

Claim 1st A hydraulic hoist in which the discharge water from the cylinder is forced or pumped into a high level tank, or against pressure, when lifting light loads or by the weight of a descending load. 2nd In hydraulic hoists, the combination of appliances whereby the surplus power of the pressure of the water over that required for elevating the load or the weight of a descending load is utilized for the purpose of elevating the discharge water from the cylinder, or for pumping water to a high level tank or into an accumulator, or for forcing a portion of it back into the water main. 3rd A hydraulic hoist in which the discharge water, when the hoist is lilting light loads, is forced or pumped into a high level tank against pressure, by the surplus power of the water over the load, and so arranged that when heavy loads, requiring the full pressure of the water, are to be elevated, the discharge water will be passed into a low level tank; the change of the discharge being governed either automatically from the weight of the load or by the operator. 4th A hydraulic hoist in which the weight of the load in connection with a tilting lever, or its equivalent, placed on the hoist rope automatically, governs the lifting power of the hoist and the consumption of water. 5th A tilting lever, or its equivalent, placed in connection with the hoist rope and adjusted to operate in proportion to the load on the hoist car, in connection with the discharge valve or valves of the water cylinder, which valve or valves and connections are arranged to permit the discharged water to be forced to a high level tank or against pressure when the load on the hoist is light, or to permit the discharge water to pass into a low level tank or to waste when the load on the hoist is sufficient to operate said tilting lever. 6th In hydraulic hoists, the combination of appliances whereby the discharge water is introduced behind the working face of piston,. 7th A tilting lever, or its equivalent, placed in connection with the hoist rope of an elevator, in combination with a valve or valves on the discharge pipe of the water cylinder. 8th A working valve for hydraulic hoists, having independent inlet and discharge valves, which valves are placed in water chambers which communicate, and which valves are operated from a cam shaft connected to the check rope. 9th The combination of appliances whereby the discharge water of a hydraulic hoist may be passed in whole or part to a high or low level tank, either by the automatic action of a tilting lever, or its equivalent, from the weight on the hoist or by the movement of valves by an operator.