Abstract

The present invention comprises: a grinder body (10); a coupler (P) composed of a power transmitting member (20) coupled to a rotary shaft (11) of the grinder body (10), and a main body (30) provided between the grinder body (10) and the power transmitting member (20); and a grinding disk (50) composed of a grinding stone (51) in the form of a hollow disk and a coupling part (52) provided at the center of the grinding stone (51) and detachably coupled to the coupler (P), wherein a plurality of engagement protrusions (21) are radially arranged on the outer periphery of the upper end of the power transmitting member (20); a plurality of coupling pieces (53) are radially arranged on the inner periphery of a central portion of the coupling part (52); and when the main body (30) is rotated in a state where the grinding disk (50) is assembled such that the engagement protrusions (21) pass between the coupling pieces (53), the lower surface of the engagement protrusions (21) is seated on the upper surface of the coupling pieces (53) and the grinding disk (50) is fixed to the coupler (P).

IPC Classes  ?

• B24B 45/00 - Means for securing grinding wheels on rotary arbors
• B24B 23/02 - Portable grinding machines, e.g. hand-guidedAccessories therefor with rotating grinding toolsAccessories therefor

Abstract

The present invention relates to a device for detaching/attaching a hand grinder polishing disk, the device being clamped on the rotating shaft of a grinder main body so as to enable the easier and quicker detachment/attachment of a consumable polishing disk used for finishing, cutting, severing, etc. the surface of a target object, or to enable the definite prevention of loosening, vibration phenomenon, etc. The present invention comprises: a grinder main body which has a rotating shaft operating at a high speed by means of air pressure or the driving of an electric motor; a power transmission member which has a stopping protrusion formed on the upper end part of the body thereof and a hexagonal body including a flange formed on the center part of the body thereof, and which is clamped on the rotating shaft of the grinder main body by a fixing bolt; a stopper main body which has a hexagonal hole formed on the inner circumferential surface thereof for accommodating the power transmission member, and which has an arc-shaped seat groove formed on the circumference of the hexagonal hole so as to face each other; a pair of upper and lower rotating plates which are each fitted in a flat plate portion on the upper end of the stopper main body; and a disk holder which has an upper fixing ring and a lower support plate assembled on the power transmission member for fixing an abrasive material.

IPC Classes  ?

• B23B 31/10 - Chucks characterised by the retaining or gripping devices or their immediate operating means
• B23B 31/19 - Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving parallel to the axis of the chuck
• B24B 45/00 - Means for securing grinding wheels on rotary arbors
• B24B 41/00 - Component parts of grinding machines or devices, such as frames, beds, carriages or headstocks
• B24B 23/02 - Portable grinding machines, e.g. hand-guidedAccessories therefor with rotating grinding toolsAccessories therefor
• B27B 5/30 - Sawing machines working with circular saw bladesComponents or equipment therefor DetailsComponent partsAccessories for mounting or securing saw blades or saw spindles

Abstract

The present invention relates to a device for detaching/attaching a hand grinder polishing disk, the device being clamped on the rotating shaft of a grinder main body so as to enable the easier and quicker detachment/attachment of a consumable polishing disk used for finishing, cutting, severing, etc. the surface of a target object, or to enable the definite prevention of loosening, vibration phenomenon, etc. The present invention comprises: a grinder main body which has a rotating shaft operating at a high speed by means of air pressure or the driving of an electric motor; a power transmission member which has a stopping protrusion formed on the upper end part of the body thereof and a hexagonal body including a flange formed on the center part of the body thereof, and which is clamped on the rotating shaft of the grinder main body by a fixing bolt; a stopper main body which has a hexagonal hole formed on the inner circumferential surface thereof for accommodating the power transmission member, and which has an arc-shaped seat groove formed on the circumference of the hexagonal hole so as to face each other; a pair of upper and lower rotating plates which are each fitted in a flat plate portion on the upper end of the stopper main body; and a disk holder which has an upper fixing ring and a lower support plate assembled on the power transmission member for fixing an abrasive material.

IPC Classes  ?

• B24B 45/00 - Means for securing grinding wheels on rotary arbors

Abstract

The present invention relates to an apparatus for attaching/detaching a grinding tool for a grinder that can: allow the grinding tool to be conveniently attached to and detached from a coupler that is coupled to a rotating shaft of a main body constituting a hand grinder to rotate at a high speed; reinforce the adhesion force between the coupler and the grinding tool to prevent shaking thereof while grinding and to ensure stability and continuity of work; and effectively transmit power. The apparatus, according to the present invention, comprises a grinding tool, a coupler, a sleeve, locking balls, a spring, and a cap nut. The grinding tool has a cylindrical shaft, a recess, and a rectangular shaft that are formed in succession on the tip end portion of one side of a body thereof. The coupler has a mounting hole into which the grinding tool is fixedly inserted, a rectangular hole, and a screw hole to which a grinder body is fastened, and has two columns of through-holes and a flange that are formed on the peripheral surface thereof. The sleeve has a lower anti-vibration groove and a mounting groove that are formed on one side of the inner diameter part in a stepped manner and an upper anti-vibration groove formed on an opposite side thereof. The locking balls are accommodated in the through-holes formed in the coupler and are configured to move to the cylindrical shaft and the recess of the grinding tool to lock or unlock the grinding tool when the sleeve moves. The spring applies a resilient force to the sleeve when the sleeve slides. The cap nut is configured to regulate the location where the sleeve is assembled.

IPC Classes  ?

• B24B 45/00 - Means for securing grinding wheels on rotary arbors