A hoist apparatus comprising a stationary shaft supported by a support, and a sheave having a cavity with a side opening detachably, and rotatably, mounted on the shaft. A motor stator assembly is mounted on the support member and extends into the inner space through the side opening, and a motor rotor assembly is disposed within the inner space in an electromagnetically inductive relationship with the motor stator assembly. The motor rotor assembly is detachably connected to the sheave by a connecting assembly including a bolt fastening the motor rotor assembly to the sheave.

A hoisting machine for an elevator includes a motor having a motor body and a rotary shaft rotatable with respect to the motor body and a boss, which is a handle fit/removal member and is fixed to the rotary shaft. A manually operated handle for manually rotating the rotary shaft can be removably fitted on the boss. The boss is provided with a rotation prevention portion for preventing, when the manually operated handle is fixed to the boss, the manually operated handle from rotating with respect to the boss in a rotational direction of the rotary shaft.

This invention discloses a hoisting apparatus for use with an elevator system including a reduction gear assembly connected to a driving electric motor and a sheave. A main rope is reeved around the sheave and a car is suspended from the rope for vertical movement. The reduction gear assembly includes a pair of large and small gears. The small and large gears are connected respectively to the input and output shafts of the reduction gear assembly and the input and output shafts are disposed in face-to-face relationship. The electric motor are connected to the input shaft while the sheave and a brake system is connected to the output shaft. One bearing of the sheave is integral with a gearbox of the reduction gear assembly, and the large gear is supported in an overhanging manner by the shaft of the sheave. This arrangement enables silent and safe operation of elevator cars.

A parallel axis gear set has a first gear, a second gear in engagement with the first gear, and a third gear coaxially rotatable relative to the first gear and in engagement with the second gear. The third gear is in frictional engagement with the first gear, and the third gear includes a plurality of teeth having a tooth thickness larger than that of the second gear or the first gear. The meshing depth between the first gear and the second gear is greater than the meshing depth between the third gear and the second gear. An elevator hoist apparatus employing the gear set is also disclosed.

A winch for an elevator which is provided with a drive pulley rotated through a reduction gear by a motor and a brake unit provided between the motor and the reduction gear, makes it possible to produce the brake unit with a compact frame, light weight and low cost by fixing the frame of the brake unit to a casing of the reduction gear with bolts. Further, it can be assembled. easily for a short period of time. An annular oil keep groove is provided on the casing of the reduction gear. An annular oil interrupting projection disposed in the oil keep groove is provided on a hollow rotary shaft fixed the drive pulley. Therefore, lubricant is securely prevented from leakage from the inside of the casing for a long period of time.