Grinder, cover and cover set

Patent metadata

Field	Value
Publication number	US-10478943-B2
Application number	US-201615258045-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Sep 10, 2015
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A grinder ( 100 ) includes a motor ( 12 ), a housing ( 4, 6, 30 ), a spindle ( 24 ), a first cover ( 120 ), and a second cover ( 170 ). The spindle protrudes downward from the housing, is driven by the motor, and thereby rotates. The first cover is provided in the circumferential direction of the spindle, is fixed to the housing, and at least partially covers a tool accessory ( 40 ), which is mounted on the spindle, from above. The second cover is detachably mounted on the housing ( 6 ) independently of the first cover.

First claim

The invention claimed is:

1. A grinder, comprising:
a motor;
a housing that houses the motor;
a spindle that protrudes downward from the housing, is configured to be driven by the motor, and thereby rotated;
a first cover that is provided in a circumferential direction of the spindle, is fixed to the housing, and is configured to at least partially cover a tool accessory, which is mounted on the spindle, from above; and
a second cover that is detachably mounted on the first cover,
wherein:
the first cover has a bottom opening that extends at least partially along a first arc of a circle,
the second cover, when mounted on the first cover in a first orientation, covers at least a segment of the bottom opening, the segment being defined by a second arc of the circle and a chord of the circle,
the second cover is configured such that when the tool accessory is mounted on the spindle, a front-most portion of the second cover is located rearward of a front-most portion of the tool accessory,
the second cover is mountable on the first cover in the first orientation and in a second orientation;
an area of the tool accessory covered by the first and second covers is greater when the second cover is mounted in the first orientation than when the second cover is mounted in the second orientation,
when the second cover is mounted on the first cover in the second orientation, an outer surface of an upper part of the first cover faces an inner surface of the second cover and the second cover is housed on the outer-surface side of the upper part of the first cover,
when the second cover is mounted on the first cover in the first orientation, the inner surface of the second cover faces the inner surface of the first cover and a space that houses the tool accessory between the inner surface of the second cover and the inner surface of the first cover is formed, and thereby the tool accessory is at least partially covered from below,
the first cover includes a substantially semicircular upper wall part having a connection part extending partially around an axis of the spindle for connecting the first cover to the housing,
the second cover includes a substantially semicircular upper wall part having a cutout, and
the cutout extends along the connection part when the second cover is mounted on the first cover in the second orientation.

2. The grinder according to claim 1 , wherein the second cover is detachably mounted on the first cover and the second arc is about 180 degrees.

3. The grinder according to claim 1 , wherein the second cover is substantially entirely composed of rubber and is mounted on and dismounted from the first cover attendant by elastically deforming.

4. The grinder according to claim 1 , wherein:
the first and second covers have holes that are aligned with one another when the second cover is mounted on the first cover;
the grinder comprises a fixture configured to be mounted in and dismounted from the holes; and
the second cover is fixed to the first cover by mounting the fixture in the holes when the second cover is mounted on the first cover.

5. The grinder according to claim 1 , wherein:
the first cover comprises a ridge that extends along an inner side of the opening;
a recessed part engages with the ridge of the first cover and is provided in a side edge of the second cover; and
the second cover is mounted on the first cover, such that the second cover engages with the ridge, is supported by the ridge, and at least partially covers the tool accessory from below at the opening.

6. The grinder according to claim 1 , wherein:
the first cover has an elongated recess that extends along an inner side of the opening;
the second cover has a side edge that engages with the elongated recess of the first cover; and
the second cover is mounted on the first cover, such that it engages with the elongated recess, is supported by the elongated recess, and at least partially covers the tool accessory from below at the opening.

7. The grinder according to claim 1 , wherein the second cover is fixed to the first cover by a screw.

8. The grinder according to claim 1 , wherein:
the first cover includes a curved side wall extending from an arcuate edge of the upper wall part of the first cover, and
the second cover includes a curved side wall extending from an arcuate edge of the upper wall part of the second cover, and
the curved side wall of the second cover overlies the curved side wall of the first cover when the second cover is mounted on the first cover in the first orientation and in the second orientation.

9. A cover set configured to at least partially cover a spindle-mounted tool accessory of a grinder having a housing, the cover set comprising:
a first cover that is configured to be provided in a circumferential direction of the spindle, the first cover being configured to be fixed to the housing, and to at least partially cover the tool accessory from above; and
a second cover that is detachably mounted on the first cover;
wherein:
the first cover has a bottom opening that extends at least partially along a first arc of a circle,
the second cover, when mounted on the first cover in a first orientation, covers at least a segment of the bottom opening, the segment being defined by a second arc of the circle and a chord of the circle,
the second cover is configured such that when the cover set and the tool accessory are mounted on the grinder, a front-most portion of the second cover is located rearward of a front-most portion of the tool accessory,
the second cover is mountable on the first cover in the first orientation and in a second orientation;
an area of the tool accessory covered by the first and second covers is greater when the second cover is mounted in the first orientation than when the second cover is mounted in the second orientation,
when the second cover is mounted on the first cover in the second orientation, an outer surface of an upper part of the first cover faces an inner surface of the second cover and the second cover is housed on the outer-surface side of the upper part of the first cover,
when the second cover is mounted on the first cover in the first orientation, the inner surface of the second cover faces the inner surface of the first cover and a space that houses the tool accessory between the inner surface of the second cover and the inner surface of the first cover is formed, and thereby the tool accessory is at least partially covered from below,
the first cover includes a substantially semicircular upper wall part having a connection part configured to extend partially around an axis of the spindle for connecting the first cover to the housing,
the second cover includes a substantially semicircular upper wall part having a cutout, and
the cutout extends along the connection part when the second cover is mounted on the first cover in the second orientation.

10. The cover set according to claim 9 , wherein the second arc is about 180 degrees.

11. The cover set according to claim 9 , wherein the second cover is configured to be fixed to the first cover by a screw or a fixture.

12. The cover set according to claim 9 , wherein:
the first cover includes a curved side wall extending from an arcuate edge of the upper wall part of the first cover, and
the second cover includes a curved side wall extending from an arcuate edge of the upper wall part of the second cover, and
the curved side wall of the second cover overlies the curved side wall of the first cover when the second cover is mounted on the first cover in the first orientation and in the second orientation.

Assignees

• Makita Corp

Inventors

• Nakamura Shin
• Kotsuji Takafumi
• Goto Ken
• Mizutani Akira
• Ishikawa Junya

Classifications

• B25F5/026

  in the form of an auxiliary handle (B25F5/024 takes precedence) · CPC title

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B24B23/028

  Angle tools · CPC title

• B24B55/052 Primary

  with rotating tools · CPC title

• B24B23/02 Primary

  with rotating grinding tools; Accessories therefor · CPC title