Power tool with improved belt tensioning
AssigneesRobert Bosch Tool Corporation, Robert Bosch GmbH
InventorRobert S. Doumani
Life of this patent
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Abstract
A power tool assembly includes an arbor shaft configured to support a shaping device, a belt operably connected to the arbor shaft and configured to rotate the arbor shaft, a motor including a power shaft operably connected to the belt through a motor end pulley, and a positioning device operably connected to the motor, the positioning device configured to rotate the motor about a motor mounting axis of rotation which is offset from an axis of rotation of the motor end pulley, thereby modifying a tension of the belt.
Claims14
A power tool assembly, comprising:
- an arbor shaft configured to support a shaping device;
- a belt operably connected to the arbor shaft and configured to rotate the arbor shaft;
- a motor including a power shaft operably connected to the belt through a motor end pulley;
- a positioning device operably connected to the motor, the positioning device including a jack screw and configured to rotate the motor about a motor mounting axis of rotation which is offset from an axis of rotation of the motor end pulley, thereby modifying a tension of the belt;
- a belt protective cover positioned above the belt, the belt protective cover including a belt tension access port defined therein, the belt tension access port configured to provide direct access to the belt from above the power tool assembly;
- and
- a height adjust carriage, wherein:
- the motor is rotatably mounted on the height adjust carriage;
- a plate is permanently and immovably mounted to the height adjust carriage at a location proximate the motor;
- and
- the jack screw is threadedly engaged with the plate.
A method of modifying a tension of a belt of a power tool assembly including an arbor shaft configured to support a shaping device, a belt operably connected to the arbor shaft and configured to rotate the arbor shaft, and a motor including a power shaft operably connected to the belt through a motor end pulley, comprising;
- rotating the motor about a motor mounting axis of rotation which is offset from an axis of rotation of the motor end pulley using a positioning device, thereby modifying a tension of the belt;
- and
- checking the tension of the belt through a belt tension access port in a belt protective cover positioned above belt, wherein rotating the motor comprises:
- rotating a jack screw while the jack screw is threadedly engaged with a plate permanently and immovably mounted to a height adjust carriage at a location proximate the motor thereby rotating the motor with respect to the height adjust carriage.
A power tool assembly, comprising:
- an arbor shaft configured to support a shaping device;
- a belt operably connected to the arbor shaft and configured to rotate the arbor shaft;
- a motor including a power shaft operably connected to the belt through a motor end pulley;
- a jack screw operably connected to the motor, the jack screw configured to rotate the motor about a motor mounting axis of rotation which is offset from an axis of rotation of the motor end pulley, thereby modifying a tension of the belt;
- and
- a height adjust carriage, wherein:
- the motor is rotatably mounted on the height adjust carriage;
- a plate is permanently and immovably mounted to the height adjust carriage at a location proximate the motor;
- and
- the jack screw is threadedly engaged with the plate.
Dependencies are inferred from the claim text.