Abstract This invention relates to a polishing device comprising a casing, an electric motor within the casing and movable relative to the walls of the casing. The motor is biased by a spring to move in one direction. A switch, electrically connected to the motor, controls the flow of current thereto. The switch is provided with an actuating, spring-pressed button positioned in the path of movement of the motor. The shaft of the motor extends beyond the casing and carries a polishing element at its outer end. Pressure of the polishing element against the surface to be polished causes the motor to move against the force of the biasing spring and against the spring-pressed button to move the button to close the switch to energize the motor. When the pressure of the polishing element on the surface is relieved, the spring will move the motor away from the button and deenergize the motor to stop the rotation of the element. The type of motor and the voltage of the current supplied thereto are such that the motor will stall if the pressure on the polishing element exceeds a predetermined maximum pressure.
Inventors
👤 Myron E Drapen
👤 Ormond Lee Henry
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 18:51
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
A device of the class described comprising a shaft having a free end, an electric motor for rotating said shaft, a casing for housing said electric motor, said motor including a second casing pivotally mounted in the first-mentioned casing, said shaft extending beyond the first-mentioned casing, a polishing tool outside of the first mentioned casing and rotated by said shaft, a spring urging said motor to move in one direction, said motor being moved in the opposite direction by exerting pressure against the tool, means forming a switch positioned in the path of movement of the motor, and an electrical connection between the switch and the motor.
Claim 2
Independent Claim
107 words
A device of the class described comprising a shaft having a free end, an electric motor for rotating said shaft, a casing for housing said electric motor, said motor including a second casing pivotally mounted in the first-mentioned casing, said shaft extending beyond the first-mentioned casing, a polishing tool outside of the first mentioned casing and rotated by said shaft, a spring urging said motor to move in one direction, said motor being moved in the opposite direction by exerting pressure against the tool, means forming a switch positioned in the path of movement of the motor, and an electrical connection between the switch and the motor.
Claim 3
Dependent Claim
39 words
A device as recited in claim 1 wherein a second shaft is positioned at an angle to the first mentioned shaft, gearing is provided for connecting the two shafts, and the polishing tool is mounted on the second shaft.
Claim 4
Dependent Claim
26 words
A device as recited in claim 2 wherein the second casing extends beyond the first mentioned casing and encloses the first mentioned shaft and the gearing.