JPH039976Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a grinder equipped with an abrasive body for smoothing the surfaces of metal stones, wood, etc.

<Prior art> Conventionally, this type of grinder has a holder with an abrasive body adhesively fixed to the bottom surface attached to the rotating shaft of the grinder body with screws, etc., but this type of grinder is not suitable for surface smoothing work of metal etc. The abrasive body wears out quickly and needs to be replaced and removed relatively frequently.Furthermore, each time the abrasive body is replaced, the holder must be attached to or removed from the rotating shaft, which is a complicated operation and a loss of time. is large, and the cost is high because the entire holder must be replaced.

<Technical problem to be solved by the invention> The technical problem to be solved by the invention is that the polishing body held in the grinder body of the polishing machine is
When the grinding body is worn out by smoothing the surface of metal and needs to be replaced with a new one, it is possible to replace only the polishing body while leaving the holder in the grinder body, making it easy to replace and remove it. It is also an object of the present invention to reduce the time loss caused by this and to provide an inexpensive abrasive material.

<Means for solving the technical problems> The technical means taken by the present invention to solve the above problems is that a disc-shaped holder is attached to the rotating shaft of the grinder body, and a plurality of A disk-shaped abrasive body in which abrasive grains are mixed in a non-woven laminated material is provided with protrusions protruding concentrically, and a hook protruding in the opposite direction to the rotational direction of the rotating shaft is provided at the tip of the protrusion. The abrasive body is fixed to the holder by opening receiving holes facing the protrusions of the holding body and into which the protrusions are loosely fitted, and by inserting and engaging the hooks of the protrusions into the inner edges of the receiving holes. shall be.

<Operation> By inserting the protrusion of the holder attached to the tip of the grinder body into the receiving hole of the polishing body, bringing the polishing body into contact with the base of the holder, and rotating the polishing body in the rotational direction. A latching claw provided at the tip of the protrusion pierces the inner edge of the receiving hole, and the polishing body is fixed to the holder. Further, when the polishing body is rotated in the opposite direction to the rotation direction, the latching pawl comes out from the inner edge of the receiving hole, and by pulling it out downward, the polishing body can be removed from the holder.

Next, with the polishing body latched and fixed on the holder, lower the grinder body, apply the polishing body to the surface of the object to be polished, give the necessary rotation to the object to be polished, and then raise the grinder body to remove the polishing body. When separated from the surface of the object to be polished, at this moment, the polishing object, which had been subjected to resistance in the rotational direction due to friction with the object to be polished, temporarily rotates in the rotational direction faster than the rotating shaft due to the repulsive force, and the above-mentioned When the claw part hits the inner wall of the receiving hole and the rotation speed of the rotating shaft decreases, the rotation speed of the holder decreases, and the rotation speed of the polishing body attempts to maintain the previous rotation speed, so the latching claw of the holder is more strongly embedded into the inner edge of the receiving hole, and the polishing body is held by the holder.

<Example> Embodiments of the present invention will be described based on the drawings.

1 to 8 show an embodiment of the present invention, which includes an abrasive body 1 and a holder 2 for holding the abrasive body 1.
and a grinder main body 3 to which the holding body 2 is fixed.The holding body 2 is attached and fixed to the lower tip of the grinder main body 3, and the polishing body 1 is removably locked and fixed to the holding body 2. .

The holder 2 is made of metal or hard plastic material, and has a plurality of protrusions 2a protruding from predetermined positions on concentric circles on the lower surface, and the tips of the protrusions 2a are arranged in a direction opposite to the rotating direction of the rotation axis of the grinder main body 3, or The grinder body 3 is formed into a substantially inverted disk shape with latch claws 2b protruding in both directions, and a mounting hole 2d for screwing is bored in the center of the closed surface 2c. A rotating shaft 3 that is connected to and fixed vertically and has a threaded groove around the periphery.
a is inserted from the closed surface 2c side of the holder 2, and the upper surface of the holder 2 is brought into contact with the lower surface 3b of the glider, and the nut 4 is attached from the opening side of the holder 2, and the holder 2 is attached to the grinder main body as shown in FIG. Fix by screwing to 3.

The latching claw 2b is made of metal or hard plastic material and is formed into a plate shape with one side or symmetrical both sides protruding, and holes for screwing are bored at appropriate positions.The latching claw tip 2e the protrusion 2a with one side facing opposite to the direction of rotation of the rotating shaft.
The latch claw 2b is attached and fixed to the protrusion 2a as shown in FIG. 7 by abutting against the protruding end face having a screw hole, aligning the two screw holes, and attaching the screw 5. As shown in FIG. Further, the latching claw 2b may have a latching claw tip 2e integrally formed with the holder substrate 2f so as to face opposite to or in both directions of the rotation direction.

The polishing body 1 is formed into a donut plate shape with a diameter larger than that of the holder 2 using a non-woven laminated material, and has a receiving hole 1a in which the protrusion 2a is loosely fitted at a position opposite to the protrusion 2a. Ventilation holes 1b of an appropriate size are drilled through the receiving holes 1 at appropriate positions on the entire circumferential surface not in contact with the substrate 2f.
Insert the protrusion 2a of the holder 2 into the holder substrate 2
When the latch claw 2b comes into contact with f and rotates in the rotational direction, the latch claw 2b sticks into the inner edge of the receiving hole 1a and is fixedly fixed to the holder 2 as shown in FIG.

Incidentally, the polishing body 1 may be formed into a disk shape with a larger diameter than the holder 2, and ventilation holes may be provided in the opening surface of the holder 2 at the same time as on the outer circumferential surface that does not contact the holder 2.
In this case, it is preferable to provide an opening in the side surface of the holder 2 to communicate with the outside air. Further, the holder 2 may be formed on a disk having a screw fixing recess in the center for attachment to the rotating shaft 3a. FIG. 9 shows a conventional example in which the lower surface 2g of the holder 2 attached to the grinder body 3 is formed flat, and the abrasive body 1, which is approximately the same size as the holder 2, is adhesively fixed to the lower surface. be.

In this embodiment, the frictional heat generated by the friction between the polishing body and the object to be polished during polishing is radiated through the ventilation holes provided in the polishing body, and furthermore, the polishing debris is scattered through the ventilation holes. In addition, when the latch claws 2b of the protrusion 2a are provided on both sides with respect to the rotation direction, any one of the latch claws 2b is attached to the inner edge of the receiving hole 1a of the polishing body 1 at any stage from starting to braking the rotating shaft 3a. It starts to sink in.

<Effects of the invention> As described above, the present invention has a protrusion protruding from a predetermined position on the lower surface of the holder, and a sagittal hook at the tip of the protrusion in the opposite direction or in both directions of the rotating shaft of the grinder body. The polishing body is formed into an inverted disk shape with a retaining claw, and the polishing body is provided with a receiving hole into which the protrusion is loosely fitted, so the protrusion of the holder attached to the tip of the grinder body is inserted into the receiving hole of the polishing body. The abrasive body is brought into contact with the base surface of the holder, and by rotating the abrasive body in the rotational direction, the latch claw provided at the tip of the protrusion pierces the inner edge of the receiving hole, and the abrasive body is attached to the holder. Fixed. Further, when the polishing body is rotated in the opposite direction to the rotation direction, the latching pawl comes out from the inner edge of the receiving hole, and by pulling it out downward, the polishing body can be removed from the holder.

Therefore, the abrasive body can be replaced with the holder remaining in the grinder main body, and the work of replacing and removing the abrasive body is simple, thereby reducing time loss and providing an inexpensive abrasive material.

In addition, with the polishing body latched and fixed on the holder, lower the grinder body, apply the polishing body to the surface of the object to be polished, give the necessary rotation to the polishing body, and then raise the grinder body and place the polishing body on the surface of the object to be polished. When separated from the object surface, at this moment, the polishing body, which had been subjected to resistance in the rotational direction due to friction with the object to be polished, temporarily rotates in the rotational direction faster than the rotating shaft due to the repulsive force, and the above-mentioned claw part sticks into the inner wall of the receiving hole and the rotation speed of the rotating shaft decreases, the rotation speed of the holder decreases and the rotation speed of the polishing body tries to maintain the previous rotation speed, so the latching claw of the holder The polishing body is held by the holding body by being more strongly embedded in the inner edge of the receiving hole.

Therefore, even if the polishing body is separated from the object to be polished during polishing, there is no risk that the polishing body will separate from the holder.

Thus, the intended purpose can be achieved.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, in which Fig. 1 is a vertical sectional side view showing the main parts, Fig. 2 is a bottom view, Fig. 3 is a sectional view at -, and Fig. 4 shows that the latch claw is located at the inner edge of the receiving hole. 5 and 6 are enlarged bottom views showing the state before and after the latch claw is stuck into the inner edge of the receiving hole, and FIGS. 7 and 8 are respectively -
, - FIG. 9 is a vertical side view showing a conventional example. In the figure, 1: polishing body, 1a: receiving hole, 1b: ventilation hole, 2: holding body, 2a: protrusion, 2b: latching claw,
3: Grinder body.

Claims (1)

[Scope of utility model registration request] A disc-shaped holder is attached to the rotating shaft of the grinder body, a plurality of protrusions are concentrically protruded from the lower surface of the holder, and a hook protruding in the opposite direction to the rotating direction of the rotating shaft is attached to the tip of the protrusions. A disk-shaped abrasive body, which is provided with a retaining pawl and is made of a non-woven laminated material mixed with abrasive grains, has receiving holes that face the protrusions of the holder and loosely fit the protrusions, and the inner edges of these holes A grinder in which the abrasive body is fixed to the holding body by piercing and engaging the latch claw on the protrusion.