Abstract: A by-pass vacuum motor assembly wherein the motor cooling fan is positioned in an opening at the bottom of the motor band and immediately above a flat plate portion of the fan housing bracket. The flat plate portion functions as a plate diffuser, redirecting air drawn through the commutator end bracket and across the motor internals into a radial exhaust between a bottom portion of the band and a top portion of the fan end bracket. The invention also includes a brush holder clip passing through a vertical opening in the commutator end bracket and engaging a collar on the brush mechanism. The brush mechanism passes through a horizontal opening in the commutator end bracket which intersects with the vertical opening. Armature grounding is achieved by a disk maintained in a recess in the commutator end bracket and urged by a spring against the bearing receiving the motor shaft.

Abstract: A by-pass vacuum motor assembly wherein the motor cooling fan is positioned in an opening at the bottom of the motor band and immediately above a flat plate portion of the fan housing bracket. The flat plate portion functions as a plate diffuser, redirecting air drawn through the commutator end bracket and across the motor internals into a radial exhaust between a bottom portion of the band and a top portion of the fan end bracket. The invention also includes a brush holder clip passing through a vertical opening in the commutator end bracket and engaging a collar on the brush mechanism. The brush mechanism passes through a horizontal opening in the commutator end bracket which intersects with the vertical opening. Armature grounding is achieved by a disk maintained in a recess in the commutator end bracket and urged by a spring against the bearing receiving the motor shaft.

Abstract: The glassware etching apparatus etches glassware or other workpieces with abrasive grit which is entrained in an air flow. The etching apparatus includes a cabinet having a work surface, a transparent shield over the work surface and upper and lower supporting shelves below the work surface. A foamed plastic workholder for receiving the workpiece to be etched is mounted on the work surface. A venturi structure for entraining abrasive grit in the air flow is mounted in alignment with the workholder on the upper shelf. A linear tube extending from the venturi structure directs the air flow with entrained grit toward the workholder. The air flow is generated by vacuum cleaner-type motor-impellers in fluid connection with the venturi structure. Grit rebounding from the workpiece is trapped by a fabric filter which extends from the bottom of the work surface around the directing tube.