Abstract: A hoist with a regenerative resistor contains the following in a casing: a load-raising/lowering motor driven by an inverter control device and provided with a forced-cooling means; and a mechanism part containing a reduction mechanism part and a load sheave that uses power from the reduction mechanism part to take up and let out a chain. The load-raising/lowering motor, mechanism part, inverter control device, and regenerative resistor are distributed inside the casing to achieve a balance of weight about the center of gravity of the load applied when raising or lowering. Also, the inverter control device and the regenerative resistor are affixed to the casing, in close contact therewith, in parts of the casing separated from each other with the mechanism part therebetween.

Abstract: A wet friction plate is constructed such that a carbon based friction material is placed on an outer peripheral side of a friction plate and a paper based friction material is placed on an inside of a carbon based friction material. A transmission torque occupied by the paper based friction material is smaller than that occupied by the carbon based friction material. The wet friction plate can prevent a sudden unexpected slip at low temperature.

Abstract: A hoist (1) that is provided with a regenerative resistor (11) and contains the following in a casing (2, 3, and 20): a load-raising/lowering motor (7) driven by an inverter control device (12) and provided with a forced-cooling means (19); and a mechanism part (9) containing a reduction mechanism part (8) and a load sheave (10) that uses power from the reduction mechanism part (8) to take up and let out a chain. The load-raising/lowering motor (7), mechanism part (9), inverter control device (12), and regenerative resistor (11) are distributed inside the casing (2, 3, and 20) so as to achieve a balance of weight about the center of gravity (O) of the load applied when raising or lowering. Also, the inverter control device (12) and the regenerative resistor (11) are affixed to the casing (2, 3, and 20), in close contact therewith, in parts of the casing separated from each other with the mechanism part (9) therebetween.

Abstract: A wet friction plate is constructed such that a carbon based friction material is placed on a outer peripheral side of a friction plate and a paper based friction material is placed on an inside of a carbon based friction material. A transmission torque occupied by the paper based friction material is smaller than that occupied by the carbon based friction material. The wet friction plate can prevent a sudden unexpected slip at low temperature.