Back to results
US 8,430,180 B2Granted
Control mechanism for a power tool
AssigneeBlack & Decker Inc.
InventorsRene Gumpert, Horst Grossman, Bruno Ruethers
Life of this patent
Estimating the term…
Abstract
A speed adjustment mechanism for a power tool is disclosed. The mechanism includes a support, a first toothed gear for rotation by means of an adjustment dial, and a second toothed gear rotatable by means of the first toothed gear and connected to a potentiometer which is connected to a speed control circuit. Limited movement of the first and second toothed gears relative to each other is possible to reduce transmission of impacts from the adjustment dial to the speed control circuit.
Claims21
An adjustment mechanism for a power tool, the mechanism comprising:
- a support made of a resilient material and including a first support portion and a second support portion;
- a first rotary member attached to the first support portion and having a first axis of rotation and adapted to be rotated by an adjustment dial gripped by a user of the power tool;
- and
- a second rotary member attached to the second support portion and having a second axis of rotation, not coincident with said first axis of rotation, and adapted to rotate as a result of rotation of said first rotary member to transfer torque from said first rotary member to an input of a control circuit of the power tool to adjust a setting of the tool, wherein the first support portion is moveable independently with respect to the second support portion in a direction along the length of the first and second rotary member so that, in the event of an impact to the adjustment dial if the tool is dropped, the first rotary member flexes relative to said second rotary member to reduce transmission of impacts from the adjustment dial to the input of a control circuit.
1 more element
A handheld power tool comprising:
- a handle for supporting the weight of the power tool during use;
- a tool accessory holder for securing a tool accessory to the tool;
- a housing, the housing including a support made of a resilient material and including a first support portion and a second support portion;
- an adjustment dial mounted to the housing;
- a first rotary member attached to the first support portion and having a first axis of rotation and adapted to be rotated by the adjustment dial;
- a control circuit for adjusting a setting of the tool;
- and
- a second rotary member attached to the second support portion and having a second axis of rotation, not coincident with said first axis of rotation, and adapted to rotate as a result of rotation of said first rotary member to transfer torque from said first rotary member to an input of the control circuit to adjust a setting of the tool, wherein the first support portion is moveable independently with respect to the second support portion in a direction along the length of the first and second rotary member so that, in the event of an impact to the adjustment dial if the tool is dropped, the first rotary member flexes relative to said second rotary member to reduce transmission of impacts from the adjustment dial to the input of the control circuit.
5 more elements
Dependencies are inferred from the claim text.