Grinder, cover, and lock nut

Patent metadata

Field	Value
Publication number	US-10357868-B2
Application number	US-201615257987-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Sep 10, 2015
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A grinder includes a motor, a housing, a spindle and a cover. The spindle protrudes downward from the housing, is driven by the motor, and thereby rotates. The cover is provided on the spindle in the circumferential direction and at least partially covers a tool accessory, which is mounted on the spindle. The cover is configured such that at least one part deforms and/or is composed of an elastic material.

First claim

The invention claimed is:

1. A grinder, comprising:
a motor;
a housing that houses the motor;
a spindle that protrudes downward from a front portion of the housing and is configured to be driven by the motor;
a tool accessory mounted on the spindle and having a top and a bottom; and
a cover that is provided on the spindle in the circumferential direction and at least partially covers the tool accessory from above, the cover having a front portion formed from a first material, the front portion having a top wall and a side wall depending from the top wall, the side wall having a first height and a bottom edge, an interior surface of the side wall defining an interior of the front portion of the cover, the cover further including a rear portion formed from a second material that is more rigid than the first material, the rear portion having a top wall and a side wall depending from the top wall, the side wall of the rear portion having a second height and a bottom edge;
wherein the top wall of the front portion is configured to elastically shift between a first configuration, in which a point on the bottom edge of the side wall of the front portion lies below the top of the tool accessory, and a second configuration, in which the point on the bottom edge of the side wall lies above the top of the tool accessory, by flexing the first material of the top wall of the front portion along a strip of the first material spanning the cover from a first location at the side wall of the front portion to a second location at the side wall of the front portion, the strip overlying the interior of the front portion of the cover; and
the top wall of the front portion of the cover is flexible along at least two different flexing lines to elastically shift between the first configuration and the second configuration.

2. The grinder according to claim 1 , wherein the top wall of the front portion of the cover is formed from a material having a Young's modulus of equal to or less than 0.5 GPa.

3. The grinder according to claim 1 , wherein the top wall of the front portion of the cover is formed from a material having a Young's modulus of equal to or less than 0.05 GPa.

4. The grinder according to claim 1 , wherein the point on the bottom edge of the side wall of the front portion lies below the bottom of the tool accessory when the top wall of the front portion is in the first configuration.

5. The grinder according to claim 4 , wherein the first material is rubber or an elastomer.

6. The grinder according to claim 5 , wherein the second material is metal.

7. The grinder according to claim 1 , wherein the point on the bottom edge of the side wall of the front portion lies at or above the top wall of the front portion in the second configuration.

8. The grinder according to claim 1 , wherein the first height is less than the second height.

9. The grinder according to claim 8 , including a sloped wall connecting the top wall of the front portion of the cover to the top wall of the rear portion of the cover.

10. A grinder, comprising:
a motor;
a housing that houses the motor;
a spindle that protrudes downward from a front portion of the housing and is configured to be driven by the motor and to support a tool accessory for rotation with the spindle; and
a cover that is provided on the spindle in the circumferential direction, the cover having a front portion formed from a first material, the front portion having a top wall lying in a plane and a side wall depending from the top wall, the side wall having a bottom edge and a first height, an interior surface of the side wall defining an interior of the front portion of the cover, the cover further including a rear portion formed from a second material that is more rigid than the first material, the rear portion having a top wall and a side wall depending from the top wall of the rear portion, the side wall of the rear portion having a bottom edge and a second height;
wherein the top wall of the front portion is configured to elastically shift between a first configuration, in which a point on the bottom edge of the side wall of the front portion lies below the plane, and a second configuration, in which the point on the bottom edge of the side wall lies at or above the plane, by flexing the first material of the top wall of the front portion along a strip of the first material spanning the cover from a first location at the side wall of the front portion to a second location at the side wall of the front portion, the strip overlying the interior of the front portion of the cover; and
the top wall of the front portion of the cover is flexible along at least two different flexing lines to elastically shift between the first configuration and the second configuration.

11. The grinder according to claim 10 , wherein:
the first material is rubber or an elastomer and
the second material is metal.

12. The grinder according to claim 11 , wherein the first height is less than the second height.

13. The grinder according to claim 10 , wherein the first height is less than the second height.

14. The grinder according to claim 13 , including a sloped wall connecting the top wall of the front portion of the cover to the top wall of the rear portion of the cover.

15. The grinder according to claim 10 , including the tool accessory, the tool accessory having a top and a bottom,
wherein when the top wall of the front portion is in the first configuration, the point on the bottom edge of the side wall of the front portion of the cover lies below the top of the tool accessory.

16. A grinder, comprising:
a motor;
a housing that houses the motor;
a spindle that protrudes downward from a front portion of the housing and is configured to be driven by the motor and to support a tool accessory for rotation with the spindle; and
a cover that is provided on the spindle in the circumferential direction, the cover having a front portion formed from a first material, the front portion having a top wall lying in a plane and a side wall depending from the top wall, the side wall having a first height and a bottom edge, an interior surface of the side wall defining an interior of the front portion of the cover, the cover further including a rear portion formed from a second material that is more rigid than the first material, the rear portion having a top wall and a side wall depending from the top wall of the rear portion, the side wall of the rear portion having a second height and a bottom edge;
wherein the first height is less than the second height;
wherein the top wall of the front portion is configured to shift between a first configuration and a second configuration by flexing the first material of the top wall of the front portion along a strip of the first material spanning the cover from a first location at the side wall of the front portion to a second location at the side wall of the front portion, the strip overlying the interior of the front portion of the cover; and
wherein the top wall of the front portion of the cover is flexible along at least two different flexing lines to elastically shift between the first configuration and the second configuration.

17. The grinder according to claim 16 , wherein:
the first material is rubber or an elastomer and
the second material is metal.

18. The grinder according to claim 16 , including a sloped wall connecting the top wall of the front portion of the cover to the top wall of the rear portion of the cover.

19. The grinder according to claim 16 , wherein the

Assignees

• Makita Corp

Inventors

• Kawakami Takahiro
• Ninagawa Satoshi
• Shibata Kenji
• Otani Ryosuke
• Imuta Ryo

Classifications

• B24B23/02

  with rotating grinding tools; Accessories therefor · CPC title

• F16B37/041

  Releasable devices (F16B37/044, F16B37/045 take precedence) · CPC title

• B24B55/052 Primary

  with rotating tools · CPC title

• B24B55/102

  with rotating tools · CPC title

• B24B41/04 Primary

  Headstocks; Working-spindles; Features relating thereto · CPC title