Orbital disk grinder
AssigneeRobert Bosch GmbH
InventorsFriedrich Hornung, Klaus Gu/ nther, Bernd Upphoff, Julian Pfaundler
Life of this patent
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Abstract
An orbital disk grinder comprises a housing, grinding disk which can be applied to a working surface, a motor for moving the grinding disk so that the grinding disk gyrates in a circular orbit and simultaneously rotates about its axis, and speed control means operative for setting a speed of the grinding disk low when a normal force acting on the working surface is low, and high when the normal force acting on the working surface is high, so that a normal force acting on the grinding disk serves as a setting variable of the speed control means.
Claims12
An orbital disk grinder, comprising a housing;
- a grinding disk which can be applied to a working surface;
- a motor for moving said grinding disk so that said grinding disk gyrates in a circular orbit and simultaneously rotates about its axis;
- and speed control means operative for setting a speed of said grinding disk low when a normal force acting on the working surface is low, and high when the normal force acting on the working surface is high, so that an axial force acting on said grinding disk serves as a setting variable of said speed control means, said speed control means including a micro-switch which picks up the normal force acting on the grinding disk and as soon as the normal force acting on the grinding disk is smaller than a reference force, sets a lower speed, while as soon as the normal force acting on the grinding disk is larger than the reference force, it sets a higher speed.
An orbital disk grinder, comprising a housing;
- a grinding disk which can be applied to a working surface;
- a motor for moving said grinding disk so that said grinding disk gyrates in a circular orbit and simultaneously rotates about its axis;
- speed control means operative for setting a speed of said grinding disk low when a normal force acting on the working surface is low, and high when the normal force acting on the working surface is high, so that an axial force acting on said grinding disk serves as a setting variable of said speed control means;
- an output shaft through which said motor moves said grinding disk;
- an eccentric support with which said output shaft is fixedly coupled;
- and an eccentric journal carried by said eccentric support and running in a rolling bearing, so as to be rotatable with a definite bearing friction and supported with a definite eccentricity relative to said output shaft, said eccentric journal being fixedly coupled to said grinding disk and gyrates about said axis.
Dependencies are inferred from the claim text.