Drive unit for flexshaft vibrators
First Claim
1. A drive motor unit for an internal vibrator or like device comprising a tubular shell of non-conductive material each end of which has a separate cover element of non-conductive material, a cylindrical structure defining a field assembly having in electrically conductive connection therewith brush means and means for coupling thereto a source of power, said field assembly having a releasable slip-fit mount within and connection to an inner portion of said shell, an armature assembly within said field assembly having in electrically conductive relation thereto commutator means, to which said brush means are applied, said armature assembly having in connection therewith shaft means, said shaft means being supported and capped at one end by one of said cover elements, the other end of said shaft means having an axial extension defined by an electrically non-conductive element mounted to extend said shaft means within the other of said cover elements, said element defining an axial extension being effective on coupling of a source of power to said field assembly to block flow therethrough from said shaft means of electrical energy and said electrically non-conductive element forming an axial extension of said shaft means providing the output from said shaft means and said motor.
5 Assignments
0 Petitions
Accused Products
Abstract
A drive motor for a flexible drive shaft of an internal vibrator or some other device potentially the source of an electrical shock features a cylindrical structure embodying a field assembly which slip fits in a cylindrical shell which embodies positioning means to which the field assembly and electrically connected commutator brush means may be releasably fixed. Slip fit as a unit into this shell is an armature assembly including a commutator means fixedly mounted directly to and about shaft means intermediate its ends. One end portion of the shaft means provides an electrically non-conductive coupling device for drivingly relating the shaft means to a device which must be powered. The shaft means has affixed thereto the inner races of bearing means to either end of the armature assembly the outer races of which are in direct contact with and protected by electrically non-conductive material forming part of end covers for said cylindrical shell. The end covers are slotted and fan blade means are fixed directly to said shaft means to produce a cooling flow of air about the drive unit components. The drive unit also embodies rubber, electrically non-conductive, motor mounts ring-shaped base portions of which seat about and are contained to the shell by electrically non-conductive end covers. Projecting radially from the ring-shaped base portions are arms spaced by tube elements which provide electrically insulated hand holds for said drive unit between and clear of said end covers.
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Citations
15 Claims
- 1. A drive motor unit for an internal vibrator or like device comprising a tubular shell of non-conductive material each end of which has a separate cover element of non-conductive material, a cylindrical structure defining a field assembly having in electrically conductive connection therewith brush means and means for coupling thereto a source of power, said field assembly having a releasable slip-fit mount within and connection to an inner portion of said shell, an armature assembly within said field assembly having in electrically conductive relation thereto commutator means, to which said brush means are applied, said armature assembly having in connection therewith shaft means, said shaft means being supported and capped at one end by one of said cover elements, the other end of said shaft means having an axial extension defined by an electrically non-conductive element mounted to extend said shaft means within the other of said cover elements, said element defining an axial extension being effective on coupling of a source of power to said field assembly to block flow therethrough from said shaft means of electrical energy and said electrically non-conductive element forming an axial extension of said shaft means providing the output from said shaft means and said motor.
Specification