JPH10264027A - Electric disc sander - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric disc sander which can grind a surface to be ground efficiently by a smooth operation and also collect its ground powder and dust efficiently without the dispersion to the outside while confirming the grinding state by a grinding disc. SOLUTION: A dust collection cover 3 for covering a grinding disc 5 is made of a thin rubber which can turn upward and a see through window 3b which enables to see the grinding state by a grinding disc 5 is bored to several places of its outer periphery and also a light grinding operation can be carried out while projecting a brush on the opening lower end surface and slide-contacting the brush to the ground surface. Further, by providing an intake pipe 10 on the rear periphery part of the duct collection cover 3 integrally, the dust collection is carried out through the intake pipe 10 without the dispersion of a ground powder and dust to the outside by intaking the air in the dust collection cover 3 by the intake pipe 10 and also the dust collection is carried out without the deformation of the dust collection cover 3 by flowing in the outer air from the see through window 3b in response to the intake force generated in the dust collection cover 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric disk sander provided with a dust collecting cover capable of efficiently collecting dust generated during a grinding operation without scattering to the outside.

[0002]

2. Description of the Related Art Conventionally, when a grinding operation is performed by an electric disk sander or an air sander, abrasive powder or dust ground by an abrasive material such as a polishing disk or a polishing pad scatters around and deteriorates the working environment. In order to prevent this, a rubber cover body covering the abrasive is attached to the main body. In addition, an air suction hose is connected to the cover to remove grinding powder and dust inside the cover,
In the air sander, the dust in the cover is discharged to the outside by using the exhaust force of the air for driving the air motor to collect the dust.

[0003]

However, when the polishing disk or the polishing pad is covered with the cover body, the operator cannot visually observe the grinding state, and the excessively ground portion or the insufficiently ground portion may be lost. Will happen. Also,
The grinding operation using the electric disk sander is performed while the lower end surface of the rubber cover body covering the polishing disk is in sliding contact with the surface to be ground. In addition to the deformation due to the elimination of the air inside, the lower end surface of the opening adsorbs to the surface to be ground, making it difficult to operate the sander, and the efficiency of suction and removal of grinding powder and dust is significantly reduced.

For this reason, a structure in which the cover body is mounted on the main body so that the lower end face of the opening of the cover body is separated from the surface to be ground has been adopted. For example, when grinding a curved ground surface of a ship made of FRP when repairing a ship made of FRP, a part of the cover body comes into contact with the curved surface, but the cover body is thick. Since it is made of a relatively hard rubber, it is difficult to deform along a curved surface, which hinders a smooth grinding operation.

[0005] Further, when repairing the above-mentioned FRP-made ship, a long grinding operation is required and a large amount of powder is generated, so that efficient polishing ability and dust collecting ability are required. However, air sanders cannot meet this demand. The present invention has been made in view of the above-described problems, and its purpose is to make it possible to accurately confirm the grinding state and easily replace the polishing disk without removing the dust collection cover, and In addition, an object of the present invention is to provide an electric disk sander capable of performing a grinding operation smoothly and efficiently even when a surface to be ground is curved, and capable of reliably and efficiently collecting dust.

[0006]

In order to achieve the above object, an electric disc sander according to the present invention is provided with an attachment seat for a dust collecting cover integrally provided on a lower surface of a head of a handle, and a center of the attachment seat. A rotating shaft that is rotated by an electric motor provided on the handle through the hole is projected downward, and a polishing disk is attached to the rotating shaft, and a dust collecting cover for covering the polishing disk on the mounting seat is attached and detached. In the electric disc sander which is freely mounted, the dust collecting cover is formed in a thin rubber bowl shape which is open at the lower end and which can be turned up, and a brush is protruded from the lower end surface of the opening. At the same time, an intake pipe communicating with the inside of the dust collecting cover is provided integrally on the peripheral side, and a mounting hole is provided at the center of the dust collecting cover so as to be fitted to the mounting seat. Multiple peripheral parts It has a structure formed by providing a Torumado on.

In the electric disk sander constructed as described above, the invention according to claim 2 is characterized in that through holes are formed at a plurality of positions on the outer peripheral portion between the dust collecting cover and the polishing disk, and the outer peripheral end is formed. A disc-shaped dust collecting cover retainer that is curved downward is interposed, and a mounting hole formed in the center of the dust collecting cover retainer is detachably attached to the mounting seat. And

According to a third aspect of the present invention, there is provided means for attaching the dust collecting cover and the dust collecting cover retainer to the mounting seat portion, wherein the dust collecting cover and the dust collecting cover retainer have a horizontal slit provided in a lower portion thereof. A cylindrical mounting member is formed by screwing a peripheral surface to an outer peripheral surface of the mounting seat portion, and a central hole of the dust collection cover is removably fitted to an outer peripheral surface of an upper end portion of the mounting member. A projecting piece projecting inward from the periphery of the mounting hole of the dust collecting cover holder is inserted into and engaged with the horizontal slit facing the mounting bracket.

[0009]

[Function] Since the transparent window is provided at a plurality of locations on the outer peripheral portion of the dust collecting cover, the user can perform the work while seeing the inside of the dust collecting cover through the transparent window during the grinding operation while checking the grinding state, and also inside the dust collecting cover. When the grinding dust and dust in the dust collecting cover are sucked through the suction pipe communicating with the air, the outside air flows into the dust collecting cover through the transparent window according to the suction and exhaust force, and the grinding dust is deformed without deforming the dust collecting cover. And dust can be reliably and efficiently discharged. In addition, since a brush is protruded from the lower end surface of the opening of the dust collection cover, a light grinding operation can be performed while sliding the brush on the surface to be ground, and the dust collection cover can be turned up. Since it is formed in a thin rubber bowl shape, even if the surface to be ground is a curved surface, the dust collection cover is deformed along the curved surface and reliable grinding work while keeping the brush in sliding contact with the surface to be ground Can be performed.

Further, since the dust collecting cover is turned up by hand as described above, if the dust collecting cover is at a corner that hinders the grinding operation, the dust collecting cover is turned up to perform the grinding operation smoothly. Can be.

According to the second aspect of the present invention, a plurality of through holes are formed in the outer peripheral portion between the dust collecting cover and the polishing disk, and the outer peripheral end is curved downward. Since the plate-shaped dust collecting cover retainer is interposed, if the polishing disk is unexpectedly greatly inclined, the outer peripheral end surface curved downwardly of the dust collecting cover retainer comes into contact with the surface to be ground and the polishing disk tilts. And the abrasive disc does not hit the inner surface of the dust collecting cover. Therefore, even if the dust collecting cover can be largely deformed, there is no possibility that the dust collecting cover is damaged by the polishing disk.

The means for mounting the dust collecting cover and the dust collecting cover holder on the mounting seat provided on the lower surface of the head of the handle is a pair of means provided with a horizontal slit at the bottom. After the upper inner peripheral surface of the semi-cylindrical metal fitting is screwed to the outer peripheral surface of the mounting seat, the central hole of the dust collecting cover is removably fitted to the outer peripheral surface of the upper end of the mounting metal. After that, the projecting part projecting inward from the periphery of the mounting hole of the dust collecting cover holder is inserted into the horizontal slit facing the mounting bracket and locked, so that it can be easily mounted and removed. Work can be done easily.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG.
Is a hollow handle, on the head 1a side of which the electric motor 2 is integrally disposed, and on the lower surface of the electric motor 2, a disc-shaped mounting seat portion 4 of the dust collection cover 3 is fixed. The electric motor 2 is inserted through a center hole (not shown) of the mounting seat 4.
The rotating shaft 2a rotated by the shaft protrudes vertically downward. The electric motor 2 is disposed in the handle 1 and its rotating shaft is connected to the rotating shaft 2a via a reduction unit such as a meshing gear.
Is configured to transmit the rotational driving force to the motor.

The dust collecting cover 3 is made of thin rubber and has a circular mounting hole 3a for the mounting seat 4 at the center as shown in FIGS. It is formed in the shape of a bowl with a downward opening curved downward from the mounting hole 3a toward the outer periphery, and further has a rectangular shape of a size that allows the inside of the cover to be seen through the front part and both side parts of the outer part. A transparent window 3b is provided and a brush is
3c protrudes in a dense state over the entire circumference. A front end of an intake pipe 10 is integrally connected to a rear peripheral portion of the dust collection cover 3 so that the intake pipe 10 communicates with the inside of the dust collection cover 3.

Further, a disc-shaped polishing disk 5 smaller in diameter than the dust collecting cover 3 is mounted on the rotary shaft 2a of the electric motor 2, and the polishing disk 5 and the mounting seat 4 are mounted.
A dust collecting cover retainer 7 made of a soft synthetic resin is interposed between the dust collecting cover 3 and the dust collecting cover 3 mounted via a mounting bracket 6.

As shown in FIGS. 3 and 4, the mounting bracket 6 is a pair of semi-cylindrical metal fittings 6a, 6a attached to the outer peripheral surface of the mounting seat 4.
These semi-cylindrical metal fittings 6a, 6a are formed to have a height dimension higher than the thickness of the mounting seat portion 4 and to have screw insertion holes 6g formed at both end portions of the upper end portion. The piece 6b protrudes outward. Furthermore, a semi-cylindrical metal fitting 6a,
L-shaped cutouts 6c, 6c are formed at the lower portions on both sides of 6a, and horizontal slits 6d, 6d for attaching the dust collecting cover retainer 7 are formed at the lower end. Then, the projecting pieces 6b which oppose each other with the lower portions of the semi-cylindrical metal fittings 6a, 6a in contact with one half peripheral surface and the other half peripheral surface of the outer peripheral surface of the mounting seat portion 4 are provided.
Insert the small screw 6e between the screw insertion holes 6g, 6g of 6b, and insert the nut 6f
Then, the pair of semi-cylindrical metal fittings 6a, 6a are fixed to the mounting seat 4 as cylindrical mounting metal fittings 6 by screwing.

The dust collecting cover retainer 7 is formed in a disk shape having a diameter larger than that of the polishing disk 5 and smaller than that of the dust collecting cover 3. The outer peripheral end of the dust collecting cover retainer 7 is curved downward. Rectangular through-holes 7b communicating with the lower part of the through-hole 3b provided in the dust collecting cover 3 are provided on the front part and both side parts of the outer peripheral part from the part 7a to the plane part. Further, a mounting hole 7c for the mounting bracket 6 is formed in the center of the dust collecting cover holder 7, and the front and rear peripheral portions of the mounting hole 7c are connected to the horizontal slits 6d and 6b of the mounting bracket 6. Arc-shaped protruding pieces 7d, 7d for removably inserting and locking are protruded inward, and both side edges are straight holes 7e, 7e.
Is formed.

On the other hand, the mounting hole 3a of the dust collecting cover 3 is formed to have a slightly smaller diameter than the outer diameter of the mounting bracket 6, and is removably fitted and crimped to the outer peripheral surface of the upper end portion by its elastic force. The dust collecting cover retainer 7 has a mounting hole 7c inserted into a lower end portion of a mounting bracket 6 protruding downward from the mounting seat portion 4 so that front and rear protruding pieces 7d, 7d are inserted into the horizontal slit 6d of the mounting bracket 6, Insert into 6d,
It is attached to the mounting bracket 6 by locking and pressing the parallel inner end faces of the straight holes 7e, 7e facing each other so as to extend between the outer surfaces of the notches 6c, 6c of the mounting bracket 6.
In this mounting state, the upper surface of the polishing disk 5 is covered with the dust collecting cover retainer 7 and the dust collecting cover retainer 7 is covered with the dust collecting cover 3. The shaped window 3b and the rectangular hole 7b provided in the dust collecting cover retainer 7 communicate with each other, and the polishing disk 5 is externally connected through the window 3b and the hole 7b.
And the outer peripheral portion of the dust collecting cover 3 is projected downward from the dust collecting cover presser 7.

As shown in FIG. 2, the mounting structure of the polishing disk 5 includes a rubber-made large-diameter upper holding pad 8 provided with a hole 8a at the center thereof for passing through the rotary shaft 2a, and A screw hole screwed into a screw portion 2b provided on the outer periphery of the shaft 2a
9a is provided with a metal small-diameter lower holding metal fitting 9 provided with
With the center hole 5a of the polishing disk 5 inserted through the rotating shaft 2a, the polishing disk 5 is clamped by the upper clamping pad 8 and the lower clamping metal 9, and is detachably mounted on the rotating shaft 2a. .

In order to perform a surface grinding operation at the time of repairing an FRP ship using the electric disk sander constructed as described above, a switch (not shown) which holds the handle 1 and is provided at an appropriate position of the handle 1 is provided. ) To operate the electric motor 2 and to operate the dust collecting device having the dust collecting bag connected to the rear end of the intake pipe 10 connected to and communicating with the dust collecting cover 3. In this state, the grinding disk 5 is applied to the surface to be ground, and the handle 1 is operated to move the polishing disk 5 on the surface to be ground, and the surface to be ground is ground. The operator visually observes the ground portion from the transparent window 3b of the dust collecting cover 3 through the rectangular through hole 7b of the dust collecting cover retainer 7, and operates the polishing disk 5 while confirming that the grinding is sufficiently performed. I do.

An air suction force from the intake pipe 10 is generated in the dust collection cover 3, and outside air is taken into the dust collection cover 3 through the transparent window 3 b of the dust collection cover 3 according to the air suction force. Grinding powder and dust are sucked, and the grinding powder and dust and the like are discharged through the suction pipe 10 to the dust collecting bag side.

In the polishing operation, the brush 3c protruding from the lower end face of the opening of the dust collecting cover 7 is brought into sliding contact with the surface to be ground, and the lower end face of the opening is not adsorbed to the surface to be ground despite the suction force. And the dust collecting cover 3 is made of thin rubber, so that even if the surface to be ground is curved, it is easily elasticized along the curved surface shape. The grinding operation can be performed while deforming and sliding the brush 3c entirely on the surface to be ground. In such a grinding operation, when grinding a surface having a large degree of curvature or the like, if the inclination angle of the polishing disk 5 is increased, as shown in FIG. The contact prevents the polishing disc 5 from being tilted more than necessary and prevents the polishing disc 5 from contacting the inner surface of the dust collecting cover 3.

Further, when the dust collecting cover 3 hinders the grinding operation, the dust collecting cover 3 can be turned upside down and turned upside down to perform the grinding operation. Also,
When removing the dust collection cover 3 and the dust collection cover holder 7,
First, the lower clamp 9 holding the polishing disk 5 is detached from the rotating shaft 2a, and the polishing disk 5 and the upper clamping pad 8 are sequentially separated from the rotating shaft 2a. The pair of semi-cylindrical fittings 6a, 6a may be removed from the mounting seat 4. The operation is easily performed by loosening the screw between the small screw 6e and the nut 6f connecting the opposed protruding pieces 6b, 6b of the pair of semi-cylindrical metal fittings 6a, 6a. Since the mounting hole 3a is simply elastically pressed against the upper end of the mounting bracket 6, it is easy to separate from the mounting bracket 6, and the dust collecting cover retainer 7 is also connected to the horizontal slits 6d, 6d of the mounting bracket 6. By detaching the protruding pieces 7d, 7d locked from the horizontal slits 6d, 6d, they can be easily separated.

[0024]

As described above, according to the electric disk sander of the present invention, the dust collecting cover for covering the polishing disk is provided with the transparent windows at a plurality of outer peripheral portions of the dust collecting cover. The work can be performed while seeing the inside of the dust collecting cover from the transparent window and checking the grinding state of the grinding portion by the polishing disk, so that the grinding work can be performed efficiently and with a uniform ground surface. Dust ground by the abrasive disc can be smoothly removed through the suction pipe by suction force from the suction pipe connected to and communicating with the dust collection cover, and furthermore, the dust generated in the dust collection cover is generated. External air can be sucked into the dust collection cover through the transparent window according to the suction and exhaust power,
Although the dust collecting cover is formed to be thin, the dust collecting cover is not deformed, and the dust and the dust can be discharged reliably and efficiently.

Further, since a brush is protruded from the lower end surface of the opening of the dust collecting cover, a light grinding operation can be performed while the brush is in sliding contact with the surface to be ground, and the dust collecting cover is turned upside down. Since it is formed in a thin rubber bowl shape that can be ground, even if the surface to be ground is a curved surface, the dust collection cover is deformed along the curved surface and the brush is always kept in sliding contact with the surface to be ground. The grinding operation can be performed, and in the case where the dust collection cover is a corner that hinders the grinding operation, the dust collection cover can be turned over to smoothly perform the grinding operation.

According to the second aspect of the present invention, a plurality of holes are formed in the outer peripheral portion between the dust collecting cover and the polishing disk, and the outer peripheral end is curved downward. Since the plate-shaped dust collecting cover retainer is interposed, if the polishing disk is unexpectedly greatly inclined, the outer peripheral end surface curved downwardly of the dust collecting cover retainer comes into contact with the surface to be ground and the polishing disk tilts. Can be regulated, and therefore
The abrasive disc does not hit the inner surface of the dust collection cover,
Damage to the dust collection cover by the polishing disk 5 can be reliably prevented.

Further, according to the third aspect of the present invention, the means for attaching the dust collecting cover and the dust collecting cover holder to the mounting seat portion includes a pair of semi-cylindrical metal fittings provided with a horizontal slit at the bottom. A cylindrical mounting bracket is formed by screwing the upper inner peripheral surface to the outer peripheral surface of the mounting seat, and the central hole of the dust collecting cover is removably fitted to the outer peripheral surface of the upper end of the mounting bracket. And a projecting part projecting inward from the peripheral edge of the mounting hole of the dust collecting cover holder is inserted into the horizontal slit facing the mounting bracket and locked.
The mounting bracket can be easily mounted on the mounting seat, and the dust collection cover and the dust collection cover holder can be easily attached to and detached from the mounting bracket.

[Brief description of the drawings]

FIG. 1 is a simplified perspective view of an electric disc sander,

FIG. 2 is a longitudinal front view of the head side,

FIG. 3 is a perspective view showing an attachment structure of a dust collection cover holder and a dust collection cover.

FIG. 4 is an exploded perspective view thereof,

FIG. 5 is a vertical sectional front view showing a grinding state by a polishing disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handle 2 Electric motor 2a Rotary shaft 3 Dust collecting cover 3a Mounting hole 3b Transparent window 3c Brush 4 Mounting seat 5 Polishing disk 6 Mounting bracket 6a Semi-cylindrical metal fitting 6d Horizontal slit 7 Dust collecting cover holder 7b Through hole 10 Intake pipe

Claims (3)

[Claims] An attachment seat for a dust collection cover is integrally provided on the lower surface of the head of the handle, and a rotating shaft rotated by an electric motor disposed on the handle through a center hole of the attachment seat is lowered. And a dust collecting cover for detachably mounting the polishing disc on the rotating shaft and covering the polishing disc on the mounting seat portion. It is formed in a thin rubber bowl shape that can be opened and turned up, and a brush is projected from the lower end surface of the opening, and an intake pipe that communicates with the inside of the dust collecting cover is integrally provided on the peripheral side thereafter. An electric disk sander, further comprising a mounting hole provided in a central portion of the dust collecting cover to be fitted to the mounting seat portion, and transparent windows provided at a plurality of outer peripheral portions. 2. A disk-shaped dust collecting cover retainer having a plurality of through holes formed in an outer peripheral portion thereof and having an outer peripheral end portion curved downward is provided between the dust collecting cover and the polishing disk. 2. The electric disk sander according to claim 1, wherein a mounting hole formed in a center of the dust collecting cover retainer is detachably mounted on the mounting seat. 3. A mounting means for attaching the dust collecting cover and the dust collecting cover retainer to the mounting seat portion, wherein an upper inner peripheral surface of a pair of semi-cylindrical metal fittings provided with a horizontal slit at a lower portion is provided on the mounting seat portion. A cylindrical mounting bracket is formed by screwing to the outer peripheral surface, and the central hole of the dust collecting cover is removably fitted to the outer peripheral surface of the upper end portion of the mounting bracket, and is attached to the opposed horizontal slit of the mounting bracket. The electric disk according to claim 1 or 2, wherein a projecting portion projecting inward from a peripheral edge of a mounting hole of the dust collecting cover retainer is inserted and locked. Thunder.