JPH05202621A - Motor-driven scraper - Google Patents

Abstract

PURPOSE:To easily and securely carry out the peeling work of a coated film, greatly improve the working efficiency and prevent big noise and dust at the time of peeling the coated film by cutting off. CONSTITUTION:An eccentric 7 is fixed at the tip of the output shaft 4 of a motor 2 supported turnably at a main body 1 L equipped with a handle portion 1a. The shaft portion 15 of a blade fitting plate 14 is shaft-supported in eccentricity at the eccentric 7. The blade fitting plate 14 is connected to the main body 1L by means of elastic members 19, 19. A spare blade 26 is fitted to the blade fitting plate 14. A guide shoe 28 is fixed at the main body 1L. At a motor-driven scraper 30, the spare blade 26 conducts a circular movement that makes the eccentric quantity of the shaft portion 14 and the eccentric 7 a radius.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention repairs an elastic coated wall, an elastic coated floor, an elastic laminated floor, a cross wall, etc., which is constructed on a base of a mortar such as a building wall or floor, concrete, plywood or the like. At this time, the present invention relates to an electric scraper for peeling off an elastic coating film on a wall or floor from a base.

[0002]

2. Description of the Related Art Conventionally, when an elastic coating film of this type, for example, an acrylic resin-based or urethane resin-based coating film having elasticity is peeled off and removed from a base for repair, it is necessary to use an electric sander or an electric motor. Using an electric tool such as a hammer chisel,
The coating film was scraped off by grinding, hitting to remove the coating film, or shot blasting to spray a small diameter steel ball.

[0003]

However, when an elastic coating film is ground by an electric sander, the elasticity of the coating film prevents it from being able to perform its work smoothly. Clogged and caused clogging,
The work efficiency was remarkably deteriorated, and the treated area per day was made small.

Further, when hitting an elastic coating with an electric hammer chisel, the hammer is repelled by the elasticity of the coating and only scratches the coating, making it difficult to remove the coating from the substrate. there were. Therefore, when the coating film is removed by the electric hammer chisel, it is necessary to repeatedly hit the substantially same place, and the base is damaged, and the treated area per day is small.

Further, in the case of shot peening by shot blasting, the steel balls penetrating the coating film collide with the substrate and bounce off, damaging the substrate, and sometimes the steel balls sink into the substrate. .. If the base is damaged, the base needs to be repaired, and it takes a lot of time and labor to cure the base after removing the coating film.

Furthermore, these devices are for pressing a sander against a substrate, hitting a hammer, and colliding steel balls, which generate a large amount of noise and dust, which causes noise pollution and environmental hygiene pollution. Had been a problem of.

An object of the present invention is to provide an electric scraper capable of reducing the construction period and cost when peeling off an elastic coating film and suppressing the generation of noise and dust.

[0008]

In a first electric scraper according to the present invention, an eccentric is fixed to the tip of an output shaft of a motor rotatably supported by a main body having a grip portion, and the eccentricity is provided. The shaft part of the blade mounting plate is rotatably supported eccentrically to the child, and the main body and blade mounting plate are connected by an elastic member, and the replacement blade is detachably fixed to the blade mounting plate to rotate the output shaft. It is characterized in that the blade mounting plate sometimes moves circularly with respect to the main body.

A second electric scraper according to the present invention is characterized in that a guide shoe is fixed to the main body of the electric scraper.

In the third electric scraper according to the present invention, an eccentric is fixed to the tip of an output shaft of a motor rotatably supported by a main body having a handle, and a bearing is interposed in the eccentric. Eccentrically, the mounting hole of the blade mounting plate is externally mounted, and the replacement blade is detachably fixed to the blade mounting plate.
Circular movement of the blade mounting plate relative to the main body during rotation of the output shaft is achieved by the fulcrum pin arranged to be inserted from one side of the blade mounting plate or the main body to the other side on the straight line connecting the replacement blade and the mounting hole. It is characterized by being regulated.

[0011]

In the first electric scraper of the present invention, when the motor is driven, the shaft portion of the blade mounting plate makes a circular motion with the eccentric amount of the eccentric as a radius, and is fixed to the blade mounting plate. The blade also makes a circular movement with the same radius in the same direction as the blade mounting plate.

Then, by grasping the grip portion of the main body with a hand and moving the electric scraper along the base of a floor or a wall, the blade edge of the spare blade is lightly pressed against the base adhesive portion of the coating film, whereby a high speed circular circle of the spare blade is obtained. By the movement, the coating film is cut off from the lower surface side so as to be scraped off.

At this time, even if the back surface of the cutting edge (the surface on the ground side) contacts the ground surface, the cutting edge is slantingly contacting the ground surface, so that the cutting edge slides along the ground surface and a gliding noise is generated. No noise is generated and dust is hardly generated.

Therefore, in the first electric scraper of the present invention, since the replacement blade moves at high speed in a circle with a small radius corresponding to the eccentricity, the blade has good sharpness, and the blade edge can be lightly pressed against the adhesive portion between the coating film and the substrate. Since the coating film can be easily and surely cut off from the groundwork, it is possible to reduce the construction period and cost when peeling off the elastic coating film, and it is possible to suppress the generation of noise and dust, which can be used in hospitals and schools. It can also be used with peace of mind when repairing public buildings such as.

Then, like the second electric scraper of the present invention, if the guide shoe is brought into contact with the floor surface or the wall surface to move the main body, the angle of the cutting edge with respect to the coating film can be always kept constant. Therefore, the work of peeling off the elastic coating film can be performed more easily.

When the coating film at the corners of the room is peeled off, if the guide shoe is removed and the work is performed, the operation becomes easy and the coating film can be removed cleanly up to the corners.

In the third electric scraper of the present invention,
When the motor is driven to rotate the eccentric at a high speed, the blade mounting plate is restricted by the fulcrum pin to make a circular motion, and the replacement blade fixed to the blade mounting plate makes an elliptical motion so that it vibrates at a high speed in the width direction. ..

Then, by grasping the grip portion of the main body by hand, the electric scraper is moved along the floor or the foundation of the wall, and the blade edge of the spare blade is lightly pressed against the base adhesive portion of the coating film, whereby the high speed ellipse of the spare blade By the movement, the coating film is cut off from the lower surface side so as to be scraped off.

At this time, even if the back surface of the cutting edge (the surface on the side of the base) contacts the base, the blade tip is slantingly contacting the base, so that the blade slides along the base surface and a gliding noise is generated. No noise is generated and dust is hardly generated.

Therefore, when the elastic coating film is peeled off, the construction period and cost can be reduced, and the generation of noise and dust can be suppressed. Furthermore, in this third electric scraper, the cutting edge is not a simple circular movement in the same direction, but an elliptical movement similar to a swinging movement around a fulcrum pin, so the main body is less likely to shake and the cutting edge It is easy to place the elastic coating film at a predetermined position, and the work of peeling off the elastic coating film on a fine portion can be easily performed.

[0021]

Embodiments Embodiments will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the electric scraper 30 of the first embodiment is provided with a main body 1 having a handle portion 1a, and the main body 1 is a left and right divided plastic molded product. The body 1R and 1L are integrally connected. The connection of the divided bodies 1R and 1L is performed by the motor 2
The nuts are screwed into the four body mounting bolts 3 with the outer circumference of the body being clamped.

The output shaft 4 of the motor 2 is rotatably supported by ball bearings 5 and 6 fitted in the main body 1. As shown in FIG. 3, a key 8 is used at the tip of the output shaft 4. hand,
Further, the eccentric 7 is fixed by fixing the collar 9 to the output shaft 4 with the screw 10.

On the lower surface of the eccentric 7, there are formed a center of a mounting hole 11 in which the tip of the output shaft 4 is mounted and a bearing fitting hole 12 in which the center is eccentric about 3 to 5 mm. The blade mounting plate 1 is attached to the ball bearing 13 fitted in the dowel hole 12.
The shaft portion 15 of No. 4 is fitted in a state of being lightly press-fitted.

As described above, since the shaft portion 15 of the blade mounting plate is rotatably supported eccentrically with respect to the eccentric 7, when the eccentric 7 rotates, the blade mounting plate 14 is eccentric by the amount e. It makes a circular motion with the radius as.

On the outer periphery of the eccentric 7, a plurality of equally divided grooves 16 are provided to form a plurality of blades 17,
The rotation of the eccentric 7 prevents the dust of the coating film from entering the main body 1 by the air flow of the blades 17 and cools the motor 2.

Numeral 19 is an elastic member formed of hard rubber in a torii shape as shown in FIG. 5, and a long nut 20 is embedded in the lower end of the column portion 19a. The upper portion of the rectangular cross-section of the elastic member 19 is attached to the T-shaped groove 21 of the main body 1, and the screw 22 is screwed into the long nut 20 of the elastic member, so that the blade mounting plate 14 is attached to the main body 1 as shown in FIG. As shown in FIG. 1, two elastic members 19 are connected.

Since the elastic member 19 is an elastic material that deforms following the circular movement of the blade mounting plate 14, the elastic member 19 will achieve its purpose. Therefore, for example, a plastic molded product having spring elasticity or a spiral spring is used. May be.

On the lower surface side of the blade mounting plate 14, the spare blade insertion groove 2
The blade support plate 24 which forms 3 is fixed by two screws 25. Then, the spare blade 26 is inserted into the spare blade insertion groove 23 of the blade support plate 24, and the two screws 27 are screwed to the blade mounting plate 24, so that the spare blade 26 can be detachably attached to the blade mounting plate 14. It is installed.

The replacement blade insertion groove 23 of the blade support plate 24 is arranged so that the bottom surface (the surface opposite to the blade) and the one side surface of the replacement blade 26 are brought into contact with the groove bottom and the groove side surface on one side. Further, by screwing the screw 27, the reaction force of the spare blade 26 during use is received by the spare blade insertion groove 23.

As shown in FIGS. 6 (a) to 6 (e), the spare blade 26 has various shapes according to the properties of the coating film to be removed.
Is used. The blade edge of the spare blade 26A has an arc shape, and the blade edge of the spare blade 26B has an inclined arc shape. The replaceable blade 26C has an inclined surface, the replaceable blade 26D is an example in which the blade edge is flat, and the replaceable blade 26E has a groove on the blade edge of 26D. Like the replacement blades 26C, 26D, and 26E, if the blade tip is linear, it is easy to sharpen again. Further, if the mounting hole is a groove like the spare blade 26C, the attachment / detachment at the time of replacement becomes easy.

Since these spare blades 26A to 26E are provided with mounting holes at symmetrical positions, they may be mounted with the sharpening surface of the cutting edge facing up as shown in FIG. 1, depending on the properties of the coating film.
On the contrary, it can be used with the sharpening surface facing down.

A U-shaped guide shoe 28 is mounted on the side surface of the main body 1, and the guide shoe 28 is fixed to the main body 1 by screwing nuts onto two bolts 29.
The electric scraper 30 is provided with the guide shoe 2
It is configured so that the lower surface of 8 is moved against the floor surface or the wall surface.

If the mounting hole of the guide shoe 28 into which the bolt 29 is inserted is made long so that the height of the guide shoe 28 can be adjusted, the inclination angle of the spare blade 26 can be adjusted. .. Further, if the mounting portion of the guide shoe 28 in the main body 1 is recessed, the outer surface of the guide shoe 28 can be made flush with both side surfaces of the main body 1,
Aesthetically pleasing.

Reference numeral 31 is a switch built in the handle portion 1a of the main body 1, and like the well-known electric power tool, the switch 31 is provided.
A socket is attached to the tip of the cord 32 of a predetermined length connected to the.

Then, when the switch 31 is pressed to drive the motor 2 to rotate, the eccentric 7 directly connected to the output shaft 4 rotates at high speed, and the blade mounting plate 14 held by the elastic member 19 is rotated.
Since the shaft portion 15 of the eccentric moves circularly with the eccentric amount e of the eccentric 7 as a radius, the replacement blade 26 fixed to the blade mounting plate 14 is also attached to the blade mounting plate 1.
4, the high-speed circular motion of the eccentricity e is performed in the same direction as 4, and the coating film can be peeled off by the predetermined spare blade 26.

Next, the electric scraper 40 of the second embodiment shown in FIG. 7 will be described.

This electric scraper 40 has a main body 40a.
The main body 40a includes a handle portion 41a and a motor portion main body 41 in which an electric motor (not shown) is disposed, and an attachment 46. The main body 41 projects the output shaft 43 of the electric motor, and the main body 41 around the output shaft 43 is provided with a mounting cylindrical portion 42 for mounting the attachment 46 in which the blade mounting plate 51 is preset. There is.

This attachment 46 has a blade mounting plate 51.
And an upper cover 47 and a lower cover 50, which are arranged in advance between them.

The upper cover 47 has a central hole 47a in the center thereof, and a mounting cylindrical portion 47b having a screw hole 47c extending upward in a cylindrical shape is formed around the central hole 47a. A ball plunger 48 that abuts and supports a blade mounting plate 51 described later is fixed to the center of the front side of the upper cover 47.

The lower cover 50 has a central hole 50a at the center and five connecting bolts 49 arranged at the periphery.
Thus, a space in which the blade mounting plate 51 can be arranged is provided between the upper cover 47 and the upper cover 47, and is connected to the upper cover 47. Further, the lower cover 50 has fulcrum holes 50b and 50c into which fulcrum pins 54 and 64 described later can be inserted before and after the central hole 50a.
Is equipped with.

The blade mounting plate 51 has a mounting hole 51a in the center, and a recess 52 for mounting the replacement blade 26 with a screw 58 using the pressing plate 53 at the top of the tip. Then, on the rear end side of the blade mounting plate 51, a fulcrum pin 54 that is inserted into the fulcrum hole 50b of the lower cover 50 is fixed on an extension line connecting the replacement blade 26 and the mounting hole 51a.
Further, an eccentric nut 55 as an eccentric is arranged in the mounting hole 51a with a ball bearing 56 interposed.

The eccentric nut 55 has a screw hole 55a vertically formed in the nut 55, which is offset from the center of the nut 55 by an eccentric amount e.
A female screw is threaded in correspondence with the screw portion 44 of No. 3. Incidentally, 55b is a mounting hole for inserting a jig used for mounting the eccentric nut 55 on the output shaft 43.

The operation of attaching the attachment 46 to the main body 41 will be described. First, the eccentric nut 55 is attached.
Tighten the screw portion 44 of the output shaft 43 into the screw hole 55a of
The upper surface of the eccentric nut 55 is brought into contact with the flange portion 45 above the screw portion 44 of the output shaft 43, and the collar 9 is fixed to the tip of the output shaft 43 with the screw 10. At that time, the mounting cylindrical portion 47b of the upper cover 47 is arranged at the outer peripheral portion of the mounting cylindrical portion 42 of the main body 41. Then, the screw 57 is screwed into the screw hole 47c formed in the mounting cylindrical portion 47b, and each screw 5
If the tip of 7 is brought into contact with the outer peripheral surface of the mounting cylindrical portion 42 so that the attachment 46 does not come off from the main body 41,
The attachment work of the attachment 46 is completed.

Since the inner peripheral surface of the blade mounting plate 51 corresponding to the thickness of the blade mounting plate 51 of the mounting hole 51a is fitted to the outer peripheral surface of the outer race 56a of the ball bearing 56, the fitting results in the ball mounting plate 51. Outer race 56 of bearing 56
It is prevented from falling off from a.

When a switch (not shown) is pressed to rotate the motor, the eccentric nut 55 directly connected to the output shaft 43 rotates at high speed, and the blade mounting plate 51 tries to move at high speed through the ball bearing 56. ..

At this time, the fulcrum pin 5 at the rear of the blade mounting plate 51
Since 4 is inserted into the fulcrum hole 50b of the lower cover 50, as shown in FIG. 8, the blade mounting plate 51 makes an elliptical motion so as to swing in the width direction about the fulcrum pin 54. ..

Then, by grasping the grip portion 41a of the main body 41 by hand, the electric scraper 40 is moved along the base of the floor or the wall, and the blade edge of the spare blade 26 is lightly pressed against the base adhesive portion of the coating film. By the high-speed elliptical movement of the blade 26, it is possible to cut the coating film from the lower surface side like scraping it off.

Therefore, in the electric scraper 40, unlike the electric scraper 30, the blade edge does not make a circular motion in which the cutting edges are oriented in the same direction (see the arrow of the chain double-dashed line in FIG. 8), but swings around the fulcrum pin 54. Since the movement is an elliptic movement similar to the movement (see the solid line arrow in FIG. 8), the main body 41 is less likely to shake, the blade edge can be easily placed at a predetermined position, and the work of peeling off the elastic coating film on a fine portion can be facilitated. be able to.

Further, as shown in FIG. 9, if it is replaced with a blade mounting plate 61 in which a fulcrum pin 64 to be inserted into the fulcrum hole 50c of the lower cover 50 is arranged between the mounting hole 61a and the spare blade 26. As compared with the blade mounting plate 51, the stroke in the width direction during movement of the spare blade 26 during use can be reduced.

Then, in this way, the fulcrum pins 54, 64
By arranging the arrangement position of No. 2 to be an arbitrary position on a straight line connecting the mounting holes 51a and 61a and the spare blade 26,
The stroke of the replaceable blade 26 that moves in the width direction can be set to a predetermined value corresponding to the type of coating film. By the way, when using the blade mounting plate 51 with a long stroke, it is suitable for peeling a soft acrylic coating, and when using the blade mounting plate 61 with a short stroke, a comparison with an epoxy type is used. Suitable for peeling hard coatings.

The electric scraper 40 of the second embodiment
Also in the above, if the guide shoe 28 is provided, the angle of the cutting edge with respect to the coating film can be always kept constant,
This allows the work of peeling off the elastic coating film to be performed more easily.

The electric scraper 40 of the second embodiment
Then, the attachment 46 provided with the blade mounting plate 51 was attached to the main body 41, and the upper cover 47 and the lower cover 50 were configured as the main body 40a side of the electric scraper. However, without disposing the upper cover 47 and the lower cover 50. , Eccentric nut 5
5. The blade mounting plate 51 is attached to the output shaft 43 with the ball bearing 56 interposed, and the fulcrum pin 54 of the blade mounting plate 51 is inserted into the fulcrum hole directly provided in the motor unit main body 41.
You may comprise an electric scraper.

Further, as shown by the chain double-dashed line in FIG. 7, a plurality of fulcrum pin mounting holes 51b capable of mounting the fulcrum pins 54 are provided in the blade mounting plate 51, and the fulcrum hole of the lower cover 50 is made into the long hole 5
It may be configured such that the arrangement of the fulcrum pin 54 can be appropriately selected with 0d.

Furthermore, instead of providing the fulcrum pins 54 and 64 on the blade attachment plates 51 and 61, fulcrum holes are provided on the blade attachment plate side, and fulcrum pins are provided on the covers 47 and 50 and the main body 41. Is also good.

Further, the electric scraper 4 of the second embodiment
In No. 0, when attaching the attachment 46 to the motor unit main body 41, the blade attachment plate 51 is previously provided in the attachment 46.
Although the case where the upper cover 47, the blade mounting plate 51, and the lower cover 50 are attached to the main body 41 in this order may be configured in this order.

[Brief description of drawings]

FIG. 1 is a side view of an electric scraper according to a first embodiment of the present invention with one side of a main body removed.

FIG. 2 is a perspective view of the same embodiment.

FIG. 3 is an enlarged cross-sectional view of an eccentric portion of the embodiment.

FIG. 4 is a bottom view of the spare blade portion of the embodiment.

FIG. 5 is a perspective view of an elastic member of the embodiment.

FIG. 6 is a plan view of various embodiments of a spare blade.

FIG. 7 is a schematic sectional view of an electric scraper of a second embodiment.

FIG. 8 is a plan view of the blade mounting plate of the same embodiment.

FIG. 9 is a plan view of a blade mounting plate of another embodiment.

[Explanation of symbols]

 1.40a.41 ... Main body, 2 ... Motor, 4.43 ... Output shaft, 7.55 ... Eccentric, 14.51.61 ... Blade mounting plate, 15 ... Shaft part of blade mounting plate, 19 ... Elastic member, 26, 26A to 26E ... Spare blade, 28 ... Guide shoe, 30/40 ... Electric scraper, 51a / 61a ... Mounting hole, 54/64 ... Support pin, 56 ... Ball bearing.

Claims (3)

[Claims] 1. An eccentric is fixed to the tip of an output shaft of a motor rotatably supported by a main body having a handle, and the shaft of the blade mounting plate is rotatably eccentrically attached to the eccentric. Along with supporting the shaft, the main body and the blade mounting plate are connected by an elastic member, and the replacement blade is detachably fixed to the blade mounting plate, and the blade mounting plate moves circularly with respect to the main body when the output shaft rotates. And an electric scraper. 2. An eccentric is fixed to a tip of an output shaft of a motor rotatably supported by a main body having a handle, and the shaft of the blade mounting plate is rotatably eccentrically attached to the eccentric. While supporting the shaft, the main body and the blade mounting plate are connected by an elastic member, and the replacement blade is detachably fixed to the blade mounting plate, and the blade mounting plate moves circularly with respect to the main body when the output shaft rotates, An electric scraper with a fixed guide shoe. 3. An eccentric is fixed to a tip of an output shaft of a motor rotatably supported by a main body having a grip portion, and a bearing is interposed between the eccentric and the blade mounting plate is eccentrically mounted. The hole is externally mounted, and the replacement blade is detachably fixed to the blade mounting plate, and is arranged so as to be inserted from one side of the blade mounting plate or the main body to the other side on a straight line connecting the replacement blade and the mounting hole. An electric scraper characterized in that the fulcrum pin restricts the circular movement of the blade mounting plate with respect to the main body when the output shaft rotates.