Work tool

Patent metadata

Field	Value
Publication number	US-10144110-B2
Application number	US-201615351659-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Feb 3, 2012
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A power tool for driving an accessary removably held between first and second clamp parts includes a first shaft having the first clamp part, a second shaft for moving the second clamp part, a holding member movable relative to the second shaft, a moving member for moving the holding member, and a biasing member for biasing the moving member. The second shaft is disposed inside the first shaft. The holding member enables the second clamp part and the first clamp part to hold the tool accessary therebetween in a first position, and disables the second clamp part and the first clamp part from holding the tool accessary in a second position. The moving member moves the holding member from the first position to the second position, and the biasing member biases the moving member when the holding member is located in the second position.

First claim

The invention claimed is:

1. A power tool configured to drive a tool accessary removably held between a first clamp part and a second clamp part, comprising:
a first shaft having the first clamp part,
a second shaft configured to move the second clamp part,
a holding member for the second shaft, the holding member being configured to be movable relative to the second shaft,
a moving member configured to move the holding member, and
a biasing member biasing the moving member,
wherein:
the first shaft and the second shaft are disposed such that their axes extend in parallel to each other and the second shaft is disposed inside the first shaft,
the holding member is configured to be movable between a first position and a second position, relative to the second shaft, the holding member enabling the second clamp part of the second shaft and the first clamp part to hold the tool accessary therebetween in the first position, and the holding member disabling the second clamp part and the first clamp part to hold the tool accessary therebetween in the second position,
the moving member is configured to move the holding member from the first position to the second position,
the biasing member is configured to bias the moving member when the holding member is located in the second position, and thereby prevent movement of the moving member, and
the biasing member is configured to engage the moving member with a recess inclined to an axial direction of the second shaft and thereby prevent movement of the moving member.

2. The power tool according to claim 1 , wherein the biasing member is also configured to bias the moving member when the holding member is located in the first position, and thereby prevent movement of the moving member.

3. The power tool according to claim 1 , wherein the second clamp part is configured such that pressing the second clamp part toward the biasing member when the holding member is in the second position causes the biasing member to shift the holding member to the first position.

4. The power tool according to claim 1 , wherein the biasing member comprises a compression spring.

5. The power tool according to claim 1 , wherein the moving member is configured to turn the holding member around an axis of rotation.

6. The power tool according to claim 1 , wherein the recess includes a convex wall portion.

7. The power tool according to claim 6 , wherein:
the biasing member comprises a compression spring,
the compression spring is also configured to bias the moving member when the holding member is located in the first position, and
the second clamp part is configured such that pressing the second clamp part toward the compression spring when the holding member is in the second position causes the compression spring to shift the holding member to the first position.

8. A power tool configured to drive a tool accessary removably held between a first clamp part and a second clamp part, comprising:
a first shaft having the first clamp part,
a second shaft configured to move the second clamp part,
a holder associated with the second shaft and mounted for movement relative to the second shaft,
an impeller configured to move the holder, and
a spring biasing the impeller,
wherein:
the first shaft and the second shaft are disposed such that their axes extend in parallel to each other and the second shaft is disposed inside the first shaft,
the holder is movable between a first position and a second position relative to the second shaft, the holder in the first position locking the tool accessory to the first shaft and the holder in the second position unlocking the tool accessory from the first shaft,
the impeller is configured to move the holder from the first position to the second position,
the spring is configured to bias the impeller to hold the holder in the second position, and
the impeller is configured to turn the holder around an axis of rotation.

9. The power tool according to claim 8 , wherein the spring is also configured to bias the impeller to hold the holder in the first position.

10. The power tool according to claim 8 , wherein the second clamp part is configured such that pressing the second clamp part toward the spring when the holder is in the second position causes the spring to shift the holder to the first position.

11. The power tool according to claim 8 , wherein the spring is configured to engage the moving member with a recess inclined to an axial direction of the second shaft.

12. The power tool according to claim 11 , wherein the recess includes a convex wall portion.

13. The power tool according to claim 12 , wherein:
the spring is also configured to bias the impeller to hold the holder in the first position, and
the second clamp part is configured such that pressing the second clamp part toward the spring when the holder is in the second position causes the spring to shift the holder to the first position.

14. A power tool configured to drive a tool accessary removably held between a first clamp part and a second clamp part, comprising:
a first shaft having the first clamp part,
a second shaft configured to move the second clamp part,
a holder associated with the second shaft and mounted for movement relative to the second shaft,
a moving member configured to move the holder, and
a spring configured to hold the holder in a first position and to hold the holder in a second position,
wherein:
the first shaft and the second shaft are disposed such that their axes extend in parallel to each other and the second shaft is disposed inside the first shaft,
the holder is movable between the first position and the second position relative to the second shaft,
the moving member is configured to move the holder from the first position to the second position, and
the second clamp part is configured such that pressing the second clamp part toward the spring when the holder is in the second position causes the spring to shift the holder to the first position.

15. The power tool according to claim 14 , wherein when the holder is in the first position the holder locks the tool accessory to the first shaft and when the holder is in the second position the holder unlocks the tool accessory from the first shaft.

16. The power tool according to claim 14 , wherein the spring is configured to engage the moving member with a recess inclined to an axial direction of the second shaft.

17. The power tool according to claim 16 , wherein the recess includes a convex wall portion.

18. The power tool according to claim 14 , wherein the moving member is configured to turn the holder around an axis of rotation.

19. The power tool according to claim 14 , wherein:
the spring is configured to bias the moving member when the holder is located in the first position, and thereby prevent movement of the moving member; and
the spring is configured to bias the moving member when the holder is located in the second position, and thereby prevent movement of the moving member.

20. The power tool according to claim 19 , wherein the moving member is configured to turn the holder around an axis of rotation.

Assignees

• Makita Corp

Inventors

• Furusawa Masanori
• Yamauchi Ken

Classifications

• B24B45/006 Primary

  Quick mount and release means for disc-like wheels, e.g. on power tools · CPC title

• B23B31/4073

  Gripping the work or tool between planes almost perpendicular to the axis · CPC title

• B25F5/00

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

• B23B31/10

  characterised by the retaining or gripping devices or their immediate operating means · CPC title

• B23Q3/12

  for securing to a spindle in general (B23Q3/152 takes precedence; chucks B23B31/02) · CPC title