Power tool

Patent metadata

Field	Value
Publication number	US-11660690-B2
Application number	US-202016953733-A
Country	US
Kind code	B2
Filing date	Nov 20, 2020
Priority date	Nov 28, 2019
Publication date	May 30, 2023
Grant date	May 30, 2023

Abstract

A power tool includes a housing, a spindle, a clamp shaft, a first biasing member, an engagement member, a first holding member, a manually operable member and a push-down member. The first biasing member biases the clamp shaft upward. The first holding member holds the engagement member to be movable between a first position and a second position in the up-down direction relative to the first holding member. The manually operable member moves a first one of the engagement member and the first holding member downward in response to a manual unclamping operation. The engagement member moves from the first position to the second position to be movable in the radial direction in response to the manual unclamping operation. The first one of the engagement member and the first holding member pushes down a tool accessory via the push-down member while the first one is moving downward.

First claim

What is claimed is:

1. A power tool configured to drive a tool accessory in an oscillating manner, the power tool comprising:
a housing;
a hollow cylindrical spindle supported by the housing to be pivotable around a driving axis that defines an up-down direction of the power tool, a tool mounting part being defined at a lower end portion of the spindle;
a clamp shaft coaxially disposed with the spindle and configured to be removable from the spindle;
a first biasing member configured to bias the clamp shaft upward toward a clamping position at which a lower end portion of the clamp shaft and the tool mounting part clamp the tool accessory;
an engagement member configured to selectively engage with the clamp shaft and thereby hold the clamp shaft in the clamping position;
a first holding member configured to hold the engagement member to be movable relative to the first holding member between a first position and a second position in the up-down direction, in the first position, the engagement member is pressed by the first holding member to engage with the clamp shaft and be immovable in a radial direction that is perpendicular to the up-down direction, and in the second position, the engagement member is movable in the radial direction;
a manually operable member configured to be externally manipulated by a user; and
a push-down member that is movable in the up-down direction relative to the spindle,
wherein:
the tool mounting part has a first inclined surface that is inclined relative to the driving axis and against which a second inclined surface of the tool accessory is pressed when the tool accessory is clamped,
the manually operable member is configured such that, in response to a manual unclamping operation being performed on the manually operable member, a first one of the engagement member and the first holding member moves downward relative to the spindle and relative to a second one of the engagement member and the first holding member,
the engagement member is configured to move in the up-down direction from the first position to the second position relative to the first holding member in response to the manual unclamping operation, and
the first one of the engagement member and the first holding member is configured to push down the tool accessory away from the tool mounting part via the push-down member while the first one is moving downward.

2. The power tool as defined in claim 1 , further comprising a second holding member configured to be movable in the up-down direction relative to the first holding member and to hold the engagement member so as to be movable in the radial direction in the second position.

3. The power tool as defined in claim 2 , wherein:
the manually operable member is configured to move the second holding member downward relative to the first holding member during the unclamping operation, and
the second holding member is configured to abut on the push-down member from above while the second holding member is moving downward.

4. The power tool as defined in claim 3 , wherein:
the first holding member, the second holding member and the engagement member are disposed above the spindle in the up-down direction, and
the push-down member is inserted inside the spindle and protrudes upward from an upper end of the spindle in the up-down direction.

5. The power tool as defined in claim 2 , wherein:
the first biasing member is a spring, and
the second holding member is configured to support one end portion of the spring.

6. The power tool as defined in claim 5 , wherein the manually operable member is configured to move the second holding member downward relative to the first holding member during the unclamping operation such that the spring no longer applies a clamping force to the clamp shaft.

7. The power tool as defined in claim 2 , wherein:
the first holding member is a collar, and
the second holding member is slidable in the up-down direction along an inner peripheral surface of the collar.

8. The power tool as defined in claim 7 , wherein:
an annular groove is defined in the inner peripheral surface of the collar and is recessed radially outward,
a holding recess is defined in the second holding member and extends radially inward from an outer peripheral surface of the second holding member,
the engagement member is disposed in the holding recess of the second holding member,
when the engagement member is in the first position, the engagement member at least partially abuts on the inner peripheral surface of the collar that is adjacent to the annular groove, and
when the engagement member is in the second position, at least a portion of the engagement member is movable into the annular groove of the collar.

9. The power tool as defined in claim 1 , wherein the push-down member is a sleeve disposed between the clamp shaft and the spindle in the radial direction.

10. The power tool as defined in claim 9 , wherein the push-down member is configured such that a lower surface of the push-down member comes into contact with an upper surface of the tool accessory around the clamp shaft.

11. The power tool as defined in claim 1 , further comprising a second biasing member that is configured to bias the push-down member upward in the up-down direction relative to the spindle.

12. The power tool as defined in claim 11 , wherein:
the first biasing member and the second biasing member are springs having different diameters, and
the power tool further comprises a common spring seat that supports one end of each of the first and second biasing members.

13. The power tool as defined in claim 1 , wherein the first holding member is supported by the housing to be immovable in the up-down direction.

14. The power tool as defined in claim 13 , further comprising a bearing held by the housing and supporting the first holding member to be rotatable around the driving axis.

15. The power tool as defined in claim 1 , further comprising a third biasing member configured to bias the engagement member radially inward.

16. A power tool configured to drive a tool accessory in an oscillating manner, the power tool comprising:
a housing;
a hollow cylindrical spindle supported by the housing to be rotatable around a driving axis that defines an up-down direction of the power tool;
a clamp shaft removably inserted in the spindle;
a collar supported by the housing above the spindle in the up-down direction so as to be immovable in the up-down direction;
an engagement member configured to selectively engage with the clamp shaft;
a holder disposed radially inward of the collar and holding the engagement member to be movable in a radial direction that is perpendicular to the up-down direction, the holder being movable in the up-down direction relative to the collar between a first vertical position and a second vertical position, the second vertical position being located lower than the first vertical position in the up-down direction;
a first spring configured to bias the holder upward in the up-down direction relative to the spindle;
a pusher that is movable in the up-down direction relative to the spindle,
a second spring configured to bias the push-down member upward in the up-down direction relative to the spindle; and
a lever configured to be manually operated;
wherein:
the collar is configured such that the engagement member is held at an engagement position, at which the engagement member engages with the clamp shaft when the holder is in the first vertical position, and the engagement member is movable radially outward from the en

Assignees

• Makita Corp

Inventors

• Aoki Yonosuke

Classifications

• B26D2001/006

  the cutting blade having a special shape, e.g. a special outline, serrations · CPC title

• B26D2001/004

  not rotating · CPC title

• B23D61/006 Primary

  Oscillating saw blades · CPC title

• B24B23/04 Primary

  with oscillating grinding tools; Accessories therefor · CPC title

• B25F5/00 Primary

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title