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US 10,478,943 B2Granted
Grinder, cover and cover set
AssigneeMakita Corporation
InventorsShin Nakamura, Takafumi Kotsuji, Ken Goto, Akira Mizutani, Junya Ishikawa
Life of this patent
Estimating the term…
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.
Claims12
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.
14 more elements
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.
11 more elements
Dependencies are inferred from the claim text.