초록 ▼

A portable abrading or polishing tool including a tool body carrying an air motor which drives an abrading or polishing head relative to the tool body, with the tool including an aspirator energized by pressurized air for inducing a flow of water to a work surface, and with air being delivered from

A portable abrading or polishing tool including a tool body carrying an air motor which drives an abrading or polishing head relative to the tool body, with the tool including an aspirator energized by pressurized air for inducing a flow of water to a work surface, and with air being delivered from a source to the motor and the aspirator separately, so that the air passing through the aspirator and to the work surface does not first pass through the motor. A check valve prevents reverse flow of water from the aspirator to the motor when the supply of pressurized air is shut off, to thus prevent damage to the motor by the water. Means are provided for holding the check valve in closed condition even when air is supplied to the motor, to enable lubrication of the tool by air containing entrained lubricant without delivery of the lubricant to the aspirator or work surface.

대표청구항 ▼

A portable abrading or polishing tool, comprising: a tool body to be held and manipulated by a user; a motor carried by said body and driven by pressurized air; a head movable relative to said body by said motor and adapted to carry an element for abrading or polishing a work surface; a water inlet;

A portable abrading or polishing tool, comprising: a tool body to be held and manipulated by a user; a motor carried by said body and driven by pressurized air; a head movable relative to said body by said motor and adapted to carry an element for abrading or polishing a work surface; a water inlet; an aspirator energized by pressurized air to induce a flow of water from said inlet to the work surface near said head; means for delivering a first flow of air from a source to and through said motor to drive it and for delivering a second flow of air separately from said source to said aspirator, to induce a flow of water to the work surface, without passage of said second flow of air through the motor; and valve means acting when air is not being supplied from said source to said motor or aspirator to prevent flow of water from said inlet into the motor.