JPH072015U - Concrete cutter - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent dust from leaking outside by always sucking dust with a suction device regardless of changes in the direction of the axis of the cutter body. [Structure] The main body (1), a washer (2), a frame (3), a cutter blade (4), a cover (5), and a suction device (6).
The main body has a built-in electric motor (11), the washer is loosely fitted to the rotary shaft (12) at one end of the main body, and the cutter blade has a tightening nut (41).
Can be freely attached and detached. The frame body has a U-shaped cross section, and the base portion (31) is attached to the main body described above, and the restraining piece (33) is loosely fitted to the rotary shaft to prevent the washer from coming off. The cover covers almost half of the cutter blade described above, is attached to the washer and is rotatable about the rotation axis described above, and is always returned by the spring (51) installed between the body and the cover. Given a tendency. The suction device (61) of the suction device is connected by the conduit (62) to the above-mentioned cover and the attachment port (52) which is tangentially opened near the rotation entrance side of the cutter blade.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a concrete cutter, and more particularly to a type that does not scatter dust to the outside.

[0002]

[Prior art]

 The concrete cutter is provided with a cover to protect the body from the cutter blade.

[0003]

[Problems to be solved by the device]

 Since the cover only covers the cutter blade, dust will be scattered around. Also, in the case of deep cutting, some workers remove the cover because it obstructs the cover, and in this case dust is floating and you can do whatever you want. In any case, not only will the environment be deteriorated, but dust in the workers' lungs will also impair their health.

[0004]

[Means for Solving the Problems]

 The concrete cutter according to the present invention includes a main body, a washer, a frame, a cutter blade, a cover, and a suction device. The main body has a built-in electric motor, and a rotary shaft that rotates in conjunction with the electric motor is provided at one end of the main body. The washer is loosely fitted on the rotary shaft. Further, the frame body has a U-shaped cross section and a base portion is attached to the main body described above, and a restraining piece is loosely fitted to the rotary shaft to prevent the washer from coming off. The cutter blade can be attached to and removed from the rotating shaft with a tightening nut. The cover has a size that covers almost half of the cutter blade, is attached to the washer at the outer surface of the central portion thereof, is rotatable around the rotary shaft, and is installed between the main body and this cover. The spring always gives a tendency to return. Further, the suction device has a suction device and a conduit that is connected to the suction device. It

The washer may be composed of a pair of semi-circular pieces that are integrated by inserting screws into the mounting pieces at both ends, and one of them may be formed on the cover.

A guide is formed on the above-mentioned cover at the connection-side open end of the above-mentioned conduit. Further, a stopper for limiting the rotation of the cover is formed at one end of the restraining piece of the frame.

[0007]

[Action]

 A washer is loosely fitted to the rotating shaft of the main body, the cover is attached to the washer, and a spring is installed between the cover and the main body. The holding piece of the frame is loosely fitted to this rotating shaft and the base is screwed to the main body. Loosely insert the cutter blade into the rotary shaft, and screw the tightening nut onto the rotary shaft to tighten the cutter blade. Connect a conduit to the suction device of the suction device, and connect the other end of this conduit to the attachment port of the cover.

When the cord of the main body is connected to the power source, the suction device is started, and the switch of the main body is turned on, the cutter blade starts to rotate. When the cutter blade is applied vertically to the concrete surface and a force is applied, the concrete surface is cut and dust is sucked into the suction device through the conduit from the cover mounting port.

When extending the cutting groove, it is easier to work by bringing the main body closer to the concrete surface. In this case, the opening edge of the cover on the mounting opening side hits the concrete surface, but since the cover is loosely fitted to the rotating shaft, it rotates while bending the spring, and retracts to a place where cutting work is not hindered. . Even in this state, dust does not leak to the outside because the vicinity of the cover mounting port is in contact with the concrete surface. When the cutter blade is pulled out from the groove, the cover returns to its original state by the spring.

The washer is composed of a pair of semi-circular pieces which are integrated by inserting screws into the mounting pieces at both ends, and when one of them is formed on the above-mentioned cover, the washer is loosely fitted on the rotary shaft. It is easy to work.

If the guide is formed at the connection-side opening end of the above-mentioned conduit in the above-mentioned cover, the resistance can be reduced when the cover hits the concrete surface, and the movement of the cover becomes smooth.

If a stopper for restricting the rotation of the cover is formed at one end of the pressing piece of the frame, it is possible to prevent the cover from being totally returned by the spring.

[0013]

【Example】

 1 is a main body, 2 is a washer, 3 is a frame, 4 is a cutter blade, 5 is a cover, and 6 is a suction device. The main body 1 has a built-in electric motor 11, and a rotary shaft 12 that interlocks with the electric motor 11 is provided at a tip end portion.

The washer 2 is loosely fitted on the rotary shaft 12. The frame 3 has a U-shaped cross section, and a base 31 is attached to the main body 1 with a screw 32, and a holding piece 33 is loosely fitted to the rotating shaft 12 to prevent the washer 2 from coming out.

The cutter blade 4 is attachable to and detachable from the rotary shaft 12 with a tightening nut 41. The cover 5 has a size that covers almost half of the cutter blade 4, is attached to the washer 2 at the outer surface of the central portion thereof, is rotatable about the rotary shaft 12, and is disposed between the main body 1 and the cover 5. The erected spring 51 constantly gives a return tendency.

The suction device 6 has a suction device 61 and a conduit 62 whose one end is electrically connected to the suction device 61, and the other end of the conduit 62 is opened in the cover 5 in the tangential direction in the vicinity of the rotation entrance side of the cutter blade 4. Is connected to the mounting port 52.

The washer 2 is composed of a pair of semicircular pieces 25 and 26 which are integrated by inserting screws 23 and 24 into the attachment pieces 21 and 22 at both ends. The other one 26 is formed in the central portion of the cover 5. Although illustration is omitted, if a spring is provided between the screws 23 and 24 and the attachment pieces 21 and 22 to form an elastic type, the work of inserting the washer 2 into the rotary shaft 12 or removing it from the rotary shaft 12 can be performed. Easier to do.

A guide 53 is formed in the cover 5 at the opening end of the conduit 62 on the side of the mounting port 52. Although the plate material is formed to be curved in the drawing, the cylindrical body may be bonded. In short, if the cutter 5 cannot prevent the cutter from moving smoothly due to the resistance of the both when the open end of the cover 5 comes into contact with the concrete surface, an appropriate configuration can be used.

A stopper 34 for limiting excessive rotation of the cover 5 is formed at one end of the restraining piece 33 of the frame body 3. The stopper 34 is formed by bending a part of the pressing piece 33 in the drawing, but a separate one may be attached. When the cover 5 separates from the concrete surface, the spring 51 prevents the cover 5 from excessively returning and rotating, and protects the hands and the like from being damaged.

When the main body 1 is perpendicular to the concrete surface P and the cutter blade 4 is pressed against the concrete surface, the concrete surface is cut. When the kerf becomes deeper, the opening end of the cutter blade of the cover 5 on the rotation entrance side hits the concrete surface, but since the cover 5 is attached to the washer 2 loosely fitted to the rotation shaft 12, the rotation shaft 12 It rotates around and does not hinder the inclination of the main body 1. Even when cutting, the main body 1 is tilted to a position substantially horizontal to the concrete surface, but in this case as well, the cover 5 is similarly rotated.

During the cutting operation, the cover 5 is always in contact with the concrete surface, and the inside of the cover 5 is connected to the suction device 6, so that dust is sucked into the suction device 61 and stood outside. do not do.

When the cutter blade 4 is pulled away from the concrete surface, the cover 5 is restored to its original state by the spring 51, and there is no hindrance to storage in the case or the like.

[0023]

[Effect of device]

 According to the present invention, the cover is automatically moved according to the position where the cutter blade contacts the concrete surface, so dust can be sucked into the suction device during work, and environmental damage and health problems can be prevented.

According to the second aspect, it is possible to easily attach the cover to the rotary shaft. According to claim 3, the resistance between the cover and the concrete surface can be reduced. According to the fourth aspect, it is possible to limit the excessive return of the cover by the spring, and it is possible to prevent the body from being damaged.

[Brief description of drawings]

FIG. 1 is a side view showing a concrete example of a concrete cutter according to the present invention.

FIG. 2 is a plan view of the cover section taken along line 2-2 of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is an explanatory view showing a usage state of the concrete cutter according to the present invention.

[Explanation of symbols]

 1 Main Body 2 Washer 3 Frame 4 Cutter Blade 5 Cover 6 Suction Device 11 Electric Motor 12 Rotating Shaft 21 Mounting Piece 22 Mounting Piece 23 Screw 24 Screw 25 Semicircular Piece 26 Semicircular Piece 31 Base 32 Screw 33 Resting Piece 34 Stopper 51 Spring 52 Attachment 53 Guide 61 Suction machine 62 Conduit P Concrete surface

Claims (4)

[Scope of utility model registration request] 1. A body (1), a washer (2), a frame (3), a cutter blade (4), a cover (5), and a suction device (6), the body (1) Is equipped with an electric motor (11) and a rotary shaft (12) interlocking with the electric motor (11) is provided at one end thereof, and the washer (2) is loosely fitted to the rotary shaft (12), (3) has a U-shaped cross section, the base (31) is attached to the main body (1), and the retainer piece (33) is loosely fitted to the rotary shaft (12) so that the washer (2) escapes. The cutter blade (4) can be freely attached to and detached from the rotary shaft (12) by the tightening nut (41), and the cover (5) covers almost half of the cutter blade (4). It has a size and is attached to the washer (2) at the outer surface of the central portion thereof and is rotatable around the rotary shaft (12) and the main body (1) described above.
The spring (51) installed between the cover and the cover (5) constantly gives a tendency to return, and the suction device (6) has a suction device (61) and a conduit (62) leading to the suction device (61). The other end of the conduit (62) is connected to a mounting port (52) that is tangentially opened in the cover (5) near the rotation entrance side of the cutter blade (4). Concrete cutter to do. 2. The washer (2) has mounting pieces (21, 2) at both ends.
Claim 2) which is composed of a pair of semicircular pieces (25, 26) that are integrated by inserting screws (23, 24) into the cover (5), one of which (26) is formed on the cover (5). The concrete cutter according to 1. 3. The guide (53) is formed in the cover (5) at the opening end of the conduit (62) on the side of the mounting port (52).
Concrete cutter described in. 4. The concrete according to claim 1, wherein a stopper (34) for restricting rotation of the cover (5) is formed at one end of the restraining piece (33) of the frame (3). cutter.