Hand grinder, flange for accomodating a grinding tool, and balancing unit

Abstract

The invention is based on a handheld power grinder, having a motor located in a housing (10), having a receiving flange (30) receiving a grinding tool (12), and having a motor-driven working shaft (16) as well as a balancing unit (22) that has at least one first and one second balancing mass (18, 20). It is proposed that the first balancing mass is embodied as a movable balancing mass (18), and the second balancing mass is embodied as a fixed balancing mass (20). A receiving flange for a grinding tool (12) and a balancing unit are also proposed.

Description

PRIOR ART [0001] The invention is based on a handheld power grinder, a receiving flange for a grinding tool, and a balancing unit as generically defined by the preambles to the independent claims. [0002] In a handheld power grinder, for instance, rotating structural units whose common center of gravity is not located in the axis of rotation are the source of vibration, which is quite annoying to a user, and to compensate for which balancing systems are employed. However, without compensation the grinding progress is greater than with compensation. [0003] German Patent Disclosure DE 196 17 478 has already proposed a handheld power grinder in which two balancing masses are used that are offset from one another in the axial direction of a working shaft. The balancing masses are located on the working shaft in the interior of the housing of the handheld power grinder between two rotary bearings. ADVANTAGES OF THE INVENTION [0004] The invention is based on a handheld power grinder, havin...

AI Technical Summary

Benefits of technology

[0004] The invention is based on a handheld power grinder, having a motor located in a housing, having a receiving flange receiving a grinding tool, and having a motor-driven working shaft as well as a balancing unit that has at least one first and one second balancing mass.

[0005] It is proposed that the first balancing mass is embodied as a movable balancing mass, and the second balancing mass is embodied as a fixed balancing mass. The movable balancing mass, with the working shaft rotating, can move into a balancing position, while the fixed balancing mass forms a structural unit with the balancing unit and maintains its position in which it was installed. If an imbalance changes, then the movable balancing mass can adapt at least partially, while the fixed balancing mass remains in the installed position. Advantageously, given a change in the imbalance over time from progressive wear and tear of the grinding tool, this makes it possible to balance a working shaft and the grinding tool reliably, even over long-term use. This is because for the same balancing capacity of the fixed and movable balancing masses, for instance, twice as much balancing capacity can be handled by subtraction or addition as by a single movable balancing unit, yet that unit requires just as much installation space. Moreover, the combination of fixed and movable balancing masses makes a compact arrangement possible. Any vibration that occurs in the handheld power grinder is lessened, making the handheld power grinder more comfortable to use.

Problems solved by technology

In a handheld power grinder, for instance, rotating structural units whose common center of gravity is not located in the axis of rotation are the source of vibration, which is quite annoying to a user, and to compensate for which balancing systems are employed.

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