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US 9,067,266 B2Granted
Bit retention device
AssigneeBlack & Decker Inc.
InventorsDaniel Puzio, Robert G. Kusmierski
Life of this patent
Estimating the term…
Abstract
A bit retention device includes a shaft having a sidewall defining a hexagonal cavity extending from a first end thereof and a ball groove extending through the sidewall and communicating with the hexagonal cavity. A ball is disposed in the ball groove and a ball spring engages the ball and biases the ball toward the first end. An actuator sleeve surrounding the shaft includes an internal ramp engaging the ball. A spring biased plunger assembly is disposed in the bore for biasing a bit received in the bore in a direction toward the insertion end.
Claims20
A tool bit holder, comprising:
- a shaft having a front end, a rear end, a sidewall defining a bit receiving cavity extending from the front end toward the rear end, and an opening extending through the sidewall and communicating with the bit receiving cavity;
- a bit retention device received in the opening;
- a first spring substantially surrounding the shaft and projecting at least partially into the opening to bias the bit retention device toward the front end of the shaft, the inward projecting portion having at least a partially curvilinear shape that is complementary to a shape of the bit retention device;
- and
- an actuator sleeve substantially surrounding the shaft and having an internal wall that engages the bit retention member, wherein the actuator sleeve is moveable between a rearward position in which the internal wall pushes the bit retention member radially inward toward the cavity to engage a tool bit that is received in the cavity, and a frontward position in which the internal wall allows the bit retention member to move radially outward from the cavity to disengage from a tool bit that is received in the cavity.
2 more elements
A tool bit holder, comprising:
- a shaft defining a longitudinal axis and having a front end, a rear end, a sidewall defining a bit receiving cavity extending from the front end toward the rear end, and an opening extending through the sidewall and communicating with the bit receiving cavity;
- a bit retention device received in the opening;
- a first spring engaging the bit retention device and biasing the bit retention device toward the front end of the shaft;
- an actuator sleeve substantially surrounding the shaft and moveable relative to the shaft between a rear position and a front position;
- and
- an internal surface defined on the actuator sleeve, the internal surface having a front surface configured to engage the bit retention member when the actuator sleeve is in the rear position, a rear surface configured to engage the bit retention member when the actuator sleeve is in the front position, and an intermediate surface between the front surface and the rear surface and configured to engage the bit retention member when the actuator sleeve is between the rear position and the front position,
- wherein the front surface has a first diameter, the intermediate surface has a second diameter that is larger than the first diameter, and the rear surface has a third diameter that is larger than the second diameter, and
- wherein the intermediate surface is inclined relative to the longitudinal axis at a first angle, and the rear surface is inclined relative to the longitudinal axis at a second angle that is smaller than the first angle.
5 more elements
A tool bit holder, comprising:
- a shaft having a front end, a rear end, a sidewall defining a bit receiving cavity having a longitudinal axis extending from the front end toward the rear end, and an opening extending through the sidewall and communicating with the bit receiving cavity;
- a bit retention device received in the opening;
- an actuator sleeve substantially surrounding the shaft and having an internal wall that engages the bit retention device, wherein the actuator sleeve is moveable between a rearward position in which the internal wall pushes the bit device radially inward toward the cavity to engage a tool bit that is received in the cavity, and a frontward position in which the internal wall allows the bit retention device to move radially outward from the cavity to disengage from a tool bit that is received in the cavity;
- a first spring having a first portion substantially surrounding the shaft rearward of the opening without biasing the actuator sleeve, and a second portion projecting at least partially into the opening to bias the bit retention device toward the front end of the shaft;
- and
- a second spring substantially surrounding the shaft forward of the opening to bias the actuator sleeve toward the rearward position.
3 more elements
Dependencies are inferred from the claim text.