US 5,433,294 AGranted

Geared elevator system

AssigneeDelaware Capital Formation, Inc.

InventorRoy J. Walker

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Abstract

A geared traction elevator includes a worm shaft, supported by a pair of tapered roller bearings in a gear box housing, one end of which projects out of an opening in the gear box housing and is coupled to the motor. The motor end bearing assembly is secured against axial movement by a retainer ring, which is secured in a groove in the gear box housing, and the motor end of the worm shaft is sealed by a dynamic seal, also secured in the housing. A cap bears against the bearings at the other end of the shaft, to pre-load the bearings to a predetermine level. In this manner, the dynamic seal may be replaced without affecting the pre-load setting. Preferably, the bearings are disposed in openings at opposite ends of the gear box housing which are large enough to allow the worm shaft to be removed through either end. The arrangement simplifies the manufacture of the gear box, and reduces the time and parts necessary to replace the dynamic seal.

Claims4

Dependent claims

A geared traction elevator comprising a motor, a drive sheave, a gear box housing, and a gear assembly supported in said gear box housing for coupling the motor and drive sheave, wherein said gear assembly includes:

a worm shaft having first and second ends and a worm gear therebetween, wherein said gear box housing has an opening and said second end of said worm shaft extends out of the opening in said gear box housing and is coupled to said motor,
a first bearing assembly for rotatably supporting said first end of said shaft in said gear box housing, and a second bearing assembly for rotatably supporting said worm shaft in the opening in said gear box housing,
means disposed in the opening in said gear box housing for securing said second bearing against axial movement in a direction toward said second end of said worm shaft,
a dynamic seal surrounding said worm shaft and mounted in the gear box housing between said means for securing said second bearing against axial movement and said second end, and
means acting on said first bearing assembly for urging said first bearing assembly toward said second bearing assembly for applying a selected pre-load to said first and second bearing assemblies in the axial direction, wherein said dynamic seal may be replaced without affecting the pre-load setting.

2 more elements

Dependencies are inferred from the claim text.