Electrically insulating belt drive for vacuum cleaner motor assembly
AssigneeRoyal Appliance Mfg. Co.
InventorJames J. Kopco
Life of this patent
Estimating the term…
Abstract
A vacuum cleaner assembly includes a motor and drive shaft extending therefrom adapted for driving an elastomeric belt which, in turn, is used to rotate a revolving brush supported in a cleaner housing. A composite belt drive member is affixed in axial alignment to an end of the motor shaft and has a relatively rigid member and electrically insulating annular oversheath. The sheath is tapered to provide a nest portion for retaining the belt on the drive member during shaft rotation. The sheath is a plastic material which provides the desired electrical insulation function.
Claims7
A vacuum cleaner motor assembly including a motor and a drive shaft extending therefrom, particularly adapted for electrically insulating a drive belt from the motor comprising:
- a belt drive member affixed in axial alignment to an end of the motor shaft and having a relatively rigid insert member and an electrically insulating annular sheath,
- the insert member having a first portion including a recess sized to closely receive a terminal end portion of the motor shaft and a second portion, axially depending therefrom, comprising a means for rigidly supporting the sheath,
- the sheath being disposed over the insert and comprising a sheath first portion encompassing the insert member first portion and having an end opening accommodating access of the motor shaft into the insert member recess, and a sheath second portion encompassing the insert member second portion and having an axially tapering outer surface comprising a radially expanding circumference in a direction away from the sheath first portion, whereby the drive belt nests on the tapering outer surface while being electrically insulated from the motor shaft.
An electrically insulating belt drive in a vacuum cleaner housing assembly comprising a composite of a rigid metallic drive member and an electrically insulating sleeve disposed about the drive member, the belt drive having a partially threaded opening at a one end for threaded fastening on a motor shaft of a motor,
- the sleeve having an axial taper to form a nesting area for a drive belt received thereon, and
- the drive member having a generally cylindrical shaft extension terminating within the sleeve nesting area to support the sleeve and the drive belt whereby drive belt is electrically insulated from the motor by the belt drive sleeve.
Dependencies are inferred from the claim text.