Apparatus for producing self-exciting hammer action, and rotary power tool incorporating such apparatus
AssigneeBlack & Decker Inc.
InventorsSeamus D. Garvey, Jonathan Robin Crabtree
Life of this patent
Estimating the term…
Abstract
An apparatus for providing percussion action in a rotary power tool having a rotary output shaft, the apparatus comprising at least one moveable mass adapted to have a component of movement parallel to the axis of the rotary output shaft to cause impacts to be applied to a working member of the tool; and a device for intermittently converting rotary movement of the rotary output shaft into movement of at least one the moveable mass to cause the impacts to be applied to the working member.
Claims21
An apparatus for providing percussion action in a rotary power tool including a working member and a rotary output shaft defining an axis, the percussion apparatus comprising:
- a moveable mass movable parallel to the axis of the rotary output shaft to cause impacts to be applied to the working member of the tool;
- conversion means for intermittently converting rotary movement of the rotary output shaft into movement of the moveable mass;
- a clutch means including a first clutch member adapted to rotate with the rotary output shaft, and a second clutch member connected to the conversion means and adapted to intermittently engage the first clutch member and be rotated thereby to cause movement of the moveable mass and wherein the second clutch member is adapted to disengage from the first clutch member when the moveable mass applies an impact to the working member.
A rotary power tool comprising:
- a housing;
- a rotary output shaft defining an axis;
- drive means drivingly connected to the rotary output shaft;
- a working member adapted to receive impacts;
- and
- a percussion apparatus, the apparatus including a moveable mass movable parallel to the axis of the rotary output shaft to cause impacts to be applied to the working member of the tool and conversion means for intermittently converting rotary movement of the rotary output shaft into movement of the moveable mass, said conversion means including a helical spring connected to the movable mass and intermittently connected to the rotary output shaft, whereby a twist imparted to the helical spring by the rotary shaft is converted into axial oscillations of the movable mass.
A rotary power tool comprising:
- a housing;
- a rotary output shaft defining an axis;
- rotary drive means drivingly connected to the rotary output shaft;
- a tool holder drivingly connected to the rotary output shaft;
- and
- a percussion apparatus, the percussion apparatus including:
- a first moveable mass movable rotationally and axially relative to the axis of the rotary output shaft;
- a second movable mass axially movable relative to the axis of the rotary output shaft;
- a spring connected between the first movable mass and the second movable mass;
- a first clutch portion rotatably connected to the rotating drive means;
- a second clutch portion connected to the first movable mass and connectable to the first clutch portion for rotationally driving the first movable mass;
- and
- whereby intermittent contact between the first and second clutch portions imparts a twisting movement to the first movable mass and the spring, the spring translates the twisting movement into an oscillating axial movement of the second movable mass, and the oscillating axial movement of the second movable mass delivers intermittent impacts to the tool holder.
Dependencies are inferred from the claim text.