# US 2013/0157550 A1 · Grinder > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0157550 A1 - Document ID: US20130157550A1 - Status: Published application - Kind: A1 - Application number: 13/710,772 - Filed: 2012-12-11 - Published: 2013-06-20 - Earliest claimed: 2011-12-14 - Assignees: Makita Corporation - Inventors: Hiroki IKUTA - Web page: https://patentgrep.com/patent/US20130157550A1 ## CPC - B24B 55/052: {with rotating tools} - B24B 23/028: {Angle tools} - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS ## Abstract A grinder includes a body having an annular portion, a wheel cover which is attachable to the annular portion, and a wheel cover holding member which holds the wheel cover. The wheel cover has a cylindrical portion which is attachable to the annular portion. The wheel cover holding member has a slide member and a pressing portion which moves the slide member. The pressing portion switches a state between an engagement state in which the slide member is engaged with the cylindrical portion and a disengagement state in which the slide member is disengaged with the cylindrical portion by moving the slide member. The pressing member moves on a second line which is parallelly offset from a first line passing the center of the annular portion in a predetermined direction. ## Claims ### Claim 1 A grinder comprising: a body which has a collar; a wheel cover which is attachable to the collar; and a holding member which is adapted to hold the wheel cover fixedly to the collar, wherein the wheel cover has an annular shaped attachment portion which is attachable to the collar, wherein the holding member has an engagement portion and an engagement portion operating member to move the engagement portion, the engagement portion being engageable with the attachment portion, wherein the engagement portion operating member switches a state between an engagement state in which the attachment portion and the engagement portion are engaged to each other and a disengagement state in which the attachment portion and the engagement portion are disengaged to each other by moving the engagement portion, and wherein the engagement portion operating member moves on a second line which is parallelly offset from a first line passing a center of the attachment portion and extending in a predetermined direction. ### Claim 2 (depends on 1) The grinder according to claim 1, wherein the engagement portion is engageable with an outer edge of the attachment portion, the outer edge being located on a line passing a central region of the attachment portion and being parallel to the first line. ### Claim 3 (depends on 1) The grinder according to claim 1, wherein the engagement portion is adapted to cancel an engagement with attachment portion by moving to inside of the attachment portion. ### Claim 4 (depends on 1) The grinder according to claim 1, wherein the engagement portion has a plurality of engagement elements which are respectively engageable with the attachment portion. ### Claim 5 (depends on 1) The grinder according to claim 1, wherein the engagement portion has a plurality of engagement elements which are respectively engageable with the attachment portion, and wherein at least one engagement element is adapted to cancel an engagement with the attachment portion by moving to inside of the attachment portion, and the other engagement element is adapted to cancel an engagement with the attachment portion by moving to outside of the attachment portion. ### Claim 6 (depends on 1) The grinder according to claim 1, wherein the engagement portion operating portion is located at a tangent line region which corresponds to a tangent line parallel to the first line, and wherein the engagement portion operating portion moves linearly along the tangent line. ### Claim 7 (depends on 4) The grinder according to claim 4, wherein said plurality of engagement elements are arranged approximately symmetrically to each other with respect to the center of the attachment portion. ### Claim 8 (depends on 4) The grinder according to claim 4, wherein the wheel cover is selectively located at one rotational position from a plurality of rotational positions which are different to each other, and the wheel cover is attachable to the collar in a selectively provided rotational position, wherein the attachment portion has a plurality of engaged portions which are engageable with the engagement portion respectively, said plurality of attached portions being provided in same interval in a circumference direction of the attachment portion, and wherein each engagement element engages with one of the attached portion from said plurality of attached portions in a selectively provided rotational position. ### Claim 9 (depends on 1) The grinder according to claim 1, wherein the holding member has a biasing member which biases the engagement portion operating portion, wherein the engagement portion operating portion is adapted to cancel an engagement between the attachment portion and engagement portion by moving against a biasing force of the biasing member. ### Claim 10 (depends on 1) The grinder according to claim 1, wherein the holding member has a regulating portion which prevents a tilting movement of the wheel cover by engaging with the attachment portion. ### Claim 11 (depends on 1) The grinder according to claim 1, wherein the attachment portion has a plurality of engaged portions which are engageable with the engagement portion, wherein the grinder further comprises a first elastic member which is engageable with the engaged portion, the first elastic member biasing the attachment portion in a direction parallel to an axial direction of the attachment portion, wherein the attachment portion rotates against the collar in a circumference direction and contacts with the collar by means of a biasing force of the first elastic member. ### Claim 12 (depends on 11) The grinder according to claim 11, wherein the grinder further comprises a second elastic member which biases the attachment portion via the holding member in the direction parallel to the axial direction of the attachment portion, and wherein the attachment portion is adapted to contact with the collar by means of a biasing force of the second elastic member. ### Claim 13 (depends on 12) The grinder according to claim 12, wherein the first elastic member and the second elastic member are formed as a singular member. ### Claim 14 (depends on 1) The grinder according to claim 1, wherein a recess is provided on the collar, the recess extending along a circumference direction of the collar at a predetermined position in an axial direction of the collar, wherein the holding member is movable in a radial direction of the collar inside the recess, and is regulated to move in an axial direction of the collar by engaging with the recess. ### Claim 15 (depends on 1) The grinder according to claim 1, wherein the attachment portion has a plurality of attached portions which are engageable with the engagement portion respectively, each attached portion having two surfaces which face to each other and cross a direction in which the wheel cover rotates respectively, wherein the engagement portion has a tapered surface which inclines to at least one of surfaces. ### Claim 16 (depends on 6) The grinder according to claim 6, further comprising a connecting portion which connects said plurality of engagement elements to each other, the connecting portion being contactable with the attachment portion, wherein the attachment portion is held by the collar and the connecting portion. ### Claim 17 (depends on 1) The grinder according to claim 1, further comprising a first elastic member which biases the attachment portion in a direction parallel to an axial direction of the attachment portion, wherein the attachment portion rotates against the collar in a circumference direction and contacts with the collar by means of a biasing force of the first elastic member, wherein the first elastic member has a base portion and a biasing portion, the base portion being fixed on the body, the biasing portion biasing the attachment portion, and wherein the first elastic member is formed by a bent elastic plate such that a first surface of the base portion with which the body contacts and a second surface of the biasing portion with which the attachment portion contacts are connected to each other. ### Claim 18 (depends on 17) The grinder according to claim 17, wherein the first elastic member is made of a metal leaf spring. ### Claim 19 A grinder comprising: a body which has a collar; a wheel cover which is attachable to the collar; and a holding member which holds the wheel cover fixedly to the collar, wherein the wheel cover has an annular shaped attachment portion which is attachable to the collar, wherein the wheel cover is selectively located at one rotational position from a plurality of rotational positions which are different to each other, and the wheel cover is attachable to the collar in a selectively provided rotational position, wherein the holding member has an engagement portion which is engageable with the attachment portion, wherein the attachment portion has a plurality of attached portions which are engageable with the engagement portion respectively, each attached portion having two surfaces which face to each other and cross a direction in which the wheel cover rotates respectively, wherein the engagement portion has a tapered surface which inclines to at least one of surfaces.