WO1998043794A1

WO1998043794A1 - Hand cutter

Info

Publication number: WO1998043794A1
Application number: PCT/JP1998/001351
Authority: WO
Inventors: Katsunori Komura; Masaru Tsujimura; Eiji Tanaka
Original assignee: Koumu Co., Ltd.; Meiwa Mfg. Co., Ltd.; Sankyo Diamond Industrial Co., Ltd.
Priority date: 1997-03-28
Filing date: 1998-03-25
Publication date: 1998-10-08

Abstract

A hand cutter including a rear scatter preventing plate (12) having a thickness substantially equal to the thickness of a cutter blade (3) and a height substantially equal to a cut depth and disposed at the same linear position as the cutter blade (3) at the back of a dust suction port (8a) of a fan casing (8) accommodating an exhaust fan (6) rotating in the interlocking arrangement with the revolution of the cutter blade (3), wherein the rear scatter preventing plate (12) is pivotally supported at the upper end thereof by the lower part of the fan casing (8) in such a manner as to be capable of rocking through a pin (14), is normally urged and caused to protrude in a vertical direction by the spring force of a coil spring (16) disposed around the pin (14) and inclined backward by the interference with a work (W) to be cut.

Description

Specification

Hand cutter-technical field

The present invention relates to a hand cutter, and more particularly, to a technique for enhancing the dust-absorbing performance of a hand cutter. Background art

Hand cutters used for hanging work are used to make cuts with a depth of about several centimeters on concrete and stone surfaces, etc., at the boundaries of the suspension, and after making such cuts, Hanging work is being implemented.

In this suspension work, considerable dust is scattered when forming a groove-shaped cut with a hand cutter, and the working environment is deteriorated.In particular, when performing this type of work indoors, The impact on installed equipment, eg, electronic equipment such as telephones, fax machines, computers, etc. will be very large.

For this reason, when performing such construction work, it was necessary to prepare the surroundings, move equipment, and to clean up after construction work. Therefore, conventionally, for example, electric Handokatsuta one with dust suction functions shown in the first 4 figures are used in this type of construction _c

The hand cutter shown in the figure has a motor 1, a gear box 2a at the tip of the motor 1, an output shaft 2 whose rotation direction has been changed by 90 degrees by the gear box 2a, and a detachable attachment / detachment to the output shaft 2. A cutter blade 3 which is connected to the shaft as much as possible; an exhaust fan 6 for dust suction which is connected to the output shaft 2 via a pair of pulleys 4 and a belt 5 at the rear side of the cutter blade 3; From the upper side to the rear side, it is composed of a blade cover 7 surrounding the periphery of the blade cover 7 and a fan casing 8 integrated with the rear part of the blade cover 7 and accommodating the exhaust fan 6. In the hand cutter having this configuration, the bottom opening of the fan casing 8 is used as a dust suction port 8a, and the cutter blade 3 is rotated while cutting the bottom surface against the surface of the workpiece W, as shown by the arrow. Dust blown backward is collected by suction at the dust inlet 8 Is done.

On the rear side of the fan casing 8, an exhaust pipe 8b is protrudingly provided. The exhaust pipe 8b is connected to a dust suction hose (not shown), a dust collecting bag, etc., via a connection attachment 9, and is collected. Dust scattering to the outside is minimized.

Reference numeral 10 in the figure denotes a handle fixed on the cover 7 for supporting the cutter by hand, and 11 denotes an electric cord connected to the rear of the motor 1.

However, even with this structure, it was not possible to collect all the dust, and there were the following technical issues.

That is, when the cut is formed by the hand cutter, as the cutting progresses, as shown in the figure, according to the thickness of the cutter blade 3 and the cut depth, for example, the actual size is about 3 thighs, and the depth is 3 A cutting groove W1 of about 5 mm is formed.

Most of the dust generated at this time is wound up toward the dust suction port 8a located immediately after the power cutter blade 3, and is sucked into the fan casing 8 through the dust suction port 8a.

However, since a part of the dust is blown to the rear of the fan casing 8 through the gap of the cutting groove W1 as shown by the arrow in the figure, the collection rate of the dust is actually However, the collection rate was at most about 80 to 90%. For this reason, in the past, the power of spraying the cutter blade 3 with water to prevent it from scattering and the use of an electric vacuum cleaner afterwards were both cumbersome and time-consuming.

The present invention has been made to solve the above problems, and an object thereof is to provide a hand cutter in which the addition of a simple mechanism improves the dust collection rate.

Another object of the present invention is to provide a hand cutter in which the dust suction hose and the dust bag are reliably and one-touchly connected to each other, and the dust bag is suspended and supported on the waist of an operator. Is to do. Disclosure of the invention

The present invention provides a cutter blade that rotates in connection with a motor, An exhaust fan that is disposed at the rear side of the blade, rotates in connection with the exhaust fan, and sucks dust generated during the cutting operation of the cutter blade, and a fan casing containing the exhaust fan. A hand cutter provided with: a vertically extending rearward side of the dust suction port of the fan casing so as to be collinear with the power cutter blade and protruding downward, and fitted into a cutting groove of the cutter blade. The rear scattering prevention material is provided.

According to this configuration, a portion of the dust that tends to flow rearward collides with the rearward scatter prevention member, bounces back, and is sucked into the suction port of the fan casing. In addition, the rear scatter prevention member has a steering function for maintaining straightness in the cutting direction by fitting into the cutting groove.

The rear scatter prevention member is constituted by a flat plate that is swingably supported, and is attached via panel means for urging the plate to return to the vertical position when the plate swings. Can be.

According to this configuration, at the start of cutting, when the cutter blade cuts in the depth direction, the plate swings upward, and the cutter smoothly moves on the surface to be cut without interfering with the bottom surface. When hard cutting particles collide with the plate during cutting, it also swings upward and escapes from the impact, which hinders cutting. No.

In the hand cutter, guide ports can be provided on both sides of the installation surface of the force cutter blade for the workpiece.

According to this configuration, it is preferable to maintain the stability of the left and right inclination directions during the cutting operation. In the force cutter blade, an outer cover is provided on the side surface of the blade cover covering the periphery thereof. Attached in a mating manner, and a packing colored differently from the cover can be interposed on the mating surface of the blade cover and the outer cover in correspondence with the position of the cutter blade.

According to this configuration, it is possible to prevent dust from being scattered to the outer surface of the power cutter blade, and to form a cut groove accurately by aligning the packing with a cutting mark line previously drawn on the surface of the workpiece. Can be. The rear scatter prevention member includes a dust spring provided behind the power cutter blade, the dust spring includes a panel portion pivotally supported near a bottom surface of a dust suction port of the fan casing, It can be constituted by a line processing panel which is formed in a loop shape in a substantially oval shape at one end of the panel portion and is inserted into a cutting groove of the power cutter blade by the biasing force of the panel portion.

According to this configuration, the dust that tends to flow backward is rebounded by the dust spring located in the cutting groove and is sucked into the suction port of the fan casing, so that the dust collection rate can be improved.

At this time, since the wire processing panel formed in a loop shape is inserted into the cutting groove, a part of the dust passing through the front end side on the cutter blade side is rebounded also on the rear end side of the wire processing panel. And the dust collection rate is further improved.

Further, the dust spring also has a steering function for maintaining the straightness in the cutting direction, similarly to the plate.

In the present invention, stopper means may be provided for holding the wire processing panel at a position above the lower surface of the cutter blade against the urging force of the panel portion. According to this configuration, in the case of reverse operation of the hand cutter, _c which can prevent interference to the reverse direction by the dust scan purine grayed

The stop means may include stop means for removing the dust spring from the dust spring in a state where the dust spring is in contact with the cutting surface. With this configuration, the dust spring stops are automatically removed from the beginning of the cutting process as the cutter blade cuts the cutting groove, and then the dust spring wire cutting is performed according to the cutting depth. Kunjepane enters the ditch sequentially.

In the present invention, guide rollers are provided on both sides of the installation surface of the cover that covers the periphery of the cutter blade with respect to the workpiece, and a rear support plate that is in contact with the cutting surface is rotatably provided on the rear bottom surface of the fan casing, A required gap can be formed between the bottom surface of the fan casing and the cutting surface by the guide roller and the rear support plate.

According to this configuration, it is possible to secure the amount of air sucked by the fan, to prevent dust from escaping from the side surface, and to further improve the collection rate. Inside the cover in the present invention, a front slide cover that is urged to rotate forward and covers the exposed portion of the power blade from the cover can be provided.

According to this configuration, the exposed portion of the cutter blade is covered with the front slide cover, so that safety during work can be sufficiently ensured.

When the front slide cover is made of a transparent material, the cutting state can be checked from the outside while ensuring safety.

Further, in the present invention, the front slide cover has a horizontally extending protrusion at the end thereof, and a V-groove for a cutting guide connected to the packing is provided on an upper surface of the front cover including the protrusion. Can be.

According to this configuration, when a worker performs a cutting operation, the V-groove provided in the foremost protrusion can be aligned with the cutting mark line while looking from above, so that more accurate cutting can be performed. become.

Further, in the present invention, dust holder packings that are in sliding contact with the side surfaces of the cutter blade can be provided at both ends of the front slide cover.

According to this configuration, dust adhering to the side surface of the cutter blade can be removed.

In the present invention, a check valve that opens toward the discharge side by the exhaust air pressure can be provided at the discharge port of the fan casing.

According to this configuration, it is possible to prevent the dust once collected from returning backward due to a stop of the motor or the like.

Further, the present invention provides a cutter blade that rotates in connection with a motor, and a cutter blade that is disposed on a rear side of the cutter blade and rotates in connection with the cutter blade, and that is generated by a cutting operation of the cutter blade. A hand cutter body including a dust suction exhaust fan for sucking air, a fan casing accommodating the exhaust fan, one end connected to the fan casing, and a flexible end connected to the dust bag suction port at the other end. And a connection attachment comprising a double-coiled ring panel that fits around the insertion end of the dust suction hose with respect to the dust suction port of the dust bag and connects the both. Provided. In the hand cutter constructed as described above, a connection attachment consisting of a double coil-shaped ring panel that is fitted around the insertion end of the dust suction hose to the dust suction port of the dust bag and that connects the two is provided. The connection between the hose and the dust bag can be made by the spring force.

In the attachment, pinch portions for expanding the ring panel can be extended at both ends of the panel body.

According to this configuration, the diameter of the panel is increased by tightening the pinch portion with a finger, and the panel can be separated from the outer periphery of the mounting portion of the panel, and can be attached and removed with one touch. Each of the pinch portions is folded back into a u-shape, and the folded end portion can be inserted into an operator's band, and can be used as a hanging support for the dust bag. According to this configuration, the connection portion between the dust suction hose and the dust bag can be attached to the body side portion of the operator's waist, and thereby attachment can be made without obstructing the air flow. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view showing a first embodiment of a hand cutter according to the present invention, and FIG. 2 is a front view including a partially enlarged portion of FIG.

FIG. 3 is a side view showing a second embodiment of the hand cutter according to the present invention, and FIG. 4 is a front view of FIG.

FIG. 5 is an enlarged view of the front slide cover of FIG. 3, FIG. 6 is an enlarged view of a portion A of FIG. 3, and FIG. 7 is a sixth view showing each height position of the dust spring. FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 8 is an enlarged view showing another form of the dust spring, and FIG. 9 is an enlarged view showing still another form of the dust spring.

FIG. 10 is an overall view of a use form showing a third embodiment of the hand cutter according to the present invention, and FIG. 11 is a side view showing an enlarged part A of FIG. 10.

FIG. 12 is an exploded perspective view showing the mounting relationship between the hose and the dust bag, which is an enlarged view of part B of FIG. 10. FIG. 13 is a plan view of the attachment used for the mounting. And a side view. FIG. 14 is a side view showing an example of a conventional hand cutter. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of a hand cutter according to the present invention. The hand cutter shown in the figure is an electric type, and in each figure, the same or corresponding parts are denoted by the same reference numerals, and differ only in different members or newly added members. The description is given with reference numerals.

The hand cutter shown in the figure is provided with a motor 1 and a gearbox 2a at the tip of the motor 1, and the output shaft 2 whose rotation direction is changed by 90 degrees by the gearbox 2a, and is detachable from the output shaft 2. A cutter blade 3 connected to the cutter blade 3 and an exhaust fan 6 for dust suction at the rear side of the cutter blade 3 and connected to the output shaft 2 via a pair of pulleys 4 and a belt 5; and an upper portion of the cutter blade 3. From the side to the rear side, it is composed of a blade cover 7 surrounding the periphery thereof, and a fan casing 8 integrated with the rear part of the blade cover 7 and accommodating the exhaust fan 6.

An exhaust pipe 8 b protrudes from the rear side of the fan casing 8, and a dust suction hose, a dust collection bag, and the like (not shown) are connected to the exhaust pipe 8 b via a connection attachment 9.

Furthermore, a handle 10 is fixed to the upper end side of the blade cover 7, and an electric cord 11 is connected to the rear of the motor 1. Such a basic shape and configuration are the same as those of the conventional hand cutter described above. It is almost the same.

In addition to the above configuration, in the present embodiment, a flat plate 12 is provided as a rearward scattering prevention member. The plate 12 is disposed at the rear of the dust suction port 8a of the fan casing 8 at the same linear position as the cutter blade 3 and has a thickness substantially equal to the thickness of the cutter blade 3 and a height substantially equal to the cutting depth. Have.

The side surface of the plate 12 for preventing rearward scattering has an oval flat cam shape with a greatly rounded lower part, and the upper end is pivotally pivoted to the lower part of the fan casing 8 via a pin 14. It is supported and can swing in the same plane as the cutter blade 3. The backscatter prevention plate 12 is always attached to the vertical position as shown by the solid line in FIG. 1 by the panel force of the winding panel 16 arranged around the pin 14. As shown by the broken line in Fig. 1 due to the force and the interference with the workpiece W, it turns upward at the rear side and tilts. Return to the hanging position by 16.

On the other hand, on both upper side surfaces of the dust suction port 8a, a pair of guide rollers 18 that roll in contact with the installation surface for the workpiece W is arranged. The guide roller 18 has a guide function for preventing a left and right inclination during cutting.

As shown in FIG. 2, two outer covers 20 are attached to the side surface of the blade cover 7 so as to prevent dust from being scattered to the outer side surface. At the joint between 7 and the outer cover 20, a portion corresponding to the position where the cutter blade 3 is arranged is, as shown in an enlarged part of FIG. This red packing 22 is used as a cutting guide by aligning the red packing 22 with the cutting mark line drawn on the workpiece W. In the above configuration, at the stage where the cutting groove has not yet been formed at the start of cutting, the rear scattering prevention plate 12 is wound by the winding panel 1 by the time the dust suction port 8a lands on the surface of the workpiece W. Pile at the panel pressure of 6 and incline backward to prevent interference with the surface.

When the cutting groove W1 is formed to some extent, and after a certain depth of cutting starts, the plate 12 returns to the vertical position due to the panel pressure, and fits into the cut cutting groove W1, and almost the cutting depth Then, the rear part of the cutting groove W1 is closed, and thereafter, the same posture is maintained until almost the target cutting position.

In this state, due to the cutting operation of the cutter blade 3, a part of the wound dust tends to flow backward in the cutting groove W1, but hits the tip of the plate 12 and the arrow in FIG. As shown in Fig. 7, almost all of the water is bounced off and sucked into the fan casing 8 via the dust suction port 8a.

In this case, if there is dust accumulated on the bottom surface of the cutting groove W1 and the like, the dust is pushed to the dust suction port 8a side by the rear scattering prevention plate 12 as the cutting progresses. The dust remaining in the groove W1 is almost completely cleared after the plate 12 has passed. Further, since the plate 12 fits into the cutting groove W1, a steering function for maintaining the straightness of the cutting operation of the cutter blade 3 also occurs. -In particular, when hard particles such as crushed stones collide, the plate 12 is piled by the panel pressure due to the impact and tilts backward, so that interference with this can be avoided. Does not interfere with

Simultaneously with the above operations, the left and right guide rollers 18 are brought into contact with the surface of the workpiece W on the left and right of the cutting groove W1 to perform the work, so that smooth movement can be performed and the left and right inclination Is also regulated, and stable cutting work can be performed in both the traveling direction and the vertical direction.

3 to 9 show a second embodiment of the hand cutter according to the present invention: In each of the drawings, the same reference numerals are given to the same or corresponding parts as in the prior art, and different members, Alternatively, a description will be given using a different reference numeral only for a newly added member.

The hand cutter shown in the figure has a motor 1, an output shaft 2 that rotates 90 degrees in a gear box 2a provided at the end of the motor 1 and rotates, and a detachably connected shaft to the output shaft 2. Cutter blade 3, an exhaust fan 6 for dust suction on the rear side of the cutter blade 3 and connected to the output shaft 2 via a pair of pulleys and a belt (not shown), and a rear part of the blade cover 7. And a housing 8 accommodating an exhaust fan 6.

An opening at the bottom of the fan casing 8 is a dust suction port 8a, and an exhaust pipe 8b is protruded at a rear portion thereof. A dust suction hose (not shown) is connected to the exhaust pipe 8b through a connection attachment 9. Connect to a dust bag. The basic shape and configuration of such a hand cutter are almost similar to conventional ones.

In the hand cutter shown in the figure, in addition to the above configuration, the side handle 120 disposed on the blade cover 7 is fixed so that it can be mounted and changed both vertically and horizontally.

A trigger handle 122 is provided at the rear of the motor 1, and a trigger switch 122 is arranged at the bottom of the trigger handle.An electric cord 111 is connected to the rear end. It has a shape that improves use and self-help.

Also, two outer covers 1 2 3 are combined on the outer surface of the blade cover 7. To prevent scattering of dust on the outer surface. Further, at the joint between the blade cover 7 and the outer cover 1 23, a red packing 1 2 4 having a thickness of about 2 mm is provided corresponding to a position corresponding to the position where the cutter blade 3 is disposed. By aligning this red packing 124 with the cutting mark line drawn on the workpiece W, it is used as a cutting guide, and the extension line of the packing 124 is visually matched with the cutting mark line. While performing the cutting work, it enables accurate cutting. The reason why the red packing is used is that the main color is conspicuous, unlike the paint color of each part of the hand cutter, and it is a matter of course that any color can be used as long as the contrast is clear.

As shown in FIG. 3, the front sides of the covers 7, 1 23 are substantially perpendicular to the workpiece W at the cutting position of the workpiece W, and the front of the cutter The force which causes the blade 3 to protrude is provided inside the cover 7, 123, on the inside of which is a front slide which is coaxial with the cover and is urged to rotate forward by a winding spring or the like (not shown). A cover 125 is provided, and the exposed portion of the cutter blade 3 protruding forward from the covers 7 and 123 is further covered to ensure safety during work.

The front slide cover 125 is made of a transparent resin molded body such as acrylic so that the rotation of the power blade 3 can be easily observed from the outside, and is further connected to the packing 124 at the center in the thickness direction. A V-groove (colored V-groove) 125 a serving as the above-mentioned cutting guide is formed.

At the end of the front cover 125, a protrusion 125b extending horizontally is formed. The lower surface of the protrusion 125b is connected to the lower surface of the outer cover 123. They are almost the same.

V-grooves (colored V-grooves) 125a connected to the packing 124 are also provided on the protrusions 125b. When such a protrusion 125b is provided, when a worker performs a cutting operation, the V-groove 125a provided in the foremost protrusion 125b is viewed from above and a cutting mark line is displayed. , So that more accurate cutting is possible.

FIG. 5 is an enlarged view of the front slide cover 125. The dust holder formed of rubber or soft synthetic resin is provided at both ends of the front slide cover 125. De-packing 1 2 5 c force Each is fixed. The dust hold packing 125c may be fixed to one of the openings. -Each dust holder packing 125c has a slit 125d through which the cutter blade 3 can be inserted. The width of this slit 125 d is almost the same as or slightly smaller than the thickness of the power blade 3, and when the cutter blade 3 passes through the slit 125 d, the width of the slit 125 d Both ends are in sliding contact with the cutter blade 3 to remove dust adhering to both side surfaces thereof.

A pair of guide rollers 126 rolling in contact with the installation surface for the workpiece W is arranged on the front outer side of the outer cover 123 and the gear box 2a. In addition, a rear support plate 128 that is swingably fixed via a bracket 127 and that is in contact with the installation surface is disposed on a rear bottom surface of the fan casing 8. The guide rollers 1 26 and the rear support plate 1 28 have a vertical guide function to prevent the left tilt during cutting, as well as the bottom surface of the cover 7, 1 2 3 and the fan casing 8 and the workpiece. By forming a predetermined gap D with W, it is possible to secure the intake air volume of the fan 6 and at the same time prevent the dust from escaping to the side, and the actual size of the gap D is about 4 since but a highest suction power, preferably les, _c

Further, in the present embodiment, near the bottom surface of the dust suction port 8a of the fan casing .8, there is provided a dust spring 129 as a rear scatter prevention member arranged in the same straight line position as the cutter blade 3. The dust springs 129 have a thickness substantially equal to the thickness of the cutter blade 3 and a height substantially equal to the cutting depth. The dust springs 129 are springs wound in a coil shape. A part 130 and a wire processing panel 130b formed by extending one end of the blade part 130 and forming a substantially elliptical shape.

As shown in the enlarged view of FIG. 6, the panel portion 130 of the dust spring 129 is mounted on the outer periphery of a support shaft 131 which is disposed through the lower side surface of the housing 8.

By fixing the extension 130a on the other end of the panel section 130 to the side of the fan casing 8, the line processing panel 13Ob is always cut as shown by ③ in FIG. Groove W side Is biased toward.

The free end on the tip side of the wire spring 130 b is rounded in a semicircular shape, and in a rotation position, a rotation restricting pin 13 disposed in parallel with the rear portion of the support shaft 130. By engaging the semicircular portion 130c with 2, the maximum rotation angle is regulated.

In addition, a stopper pin 13 3 is disposed on the rear side of the rotation regulating pin 13 2, and the inside of the loop of the wire spring 130 b of the dust spring 12 9 is attached to the stopper pin 13 3. By locking, as shown by 線 in FIG. 6, the lower end of the wire processing panel 130 b is held at an intermediate position protruding slightly below the lower portion of the fan casing 8. By locking the lower end of the loop 30b to the stopper pin 1333, the loop is held at the uppermost position indicated by a triangle in FIG.

As shown in FIG. 7, the stopper pin 1333 is axially inserted through the side surface of the fan casing 8, and is stopped by the compression coil panel 134 for stopping the stopper, which is interposed on the outer periphery of the fan casing 8 so as to protrude in the side projection direction. The spring pressure of this spring 13 4 is set to be lower than the panel force of the dust spring 12 9, and the side protruding end is formed in a push button shape. The push button section 133 a can be manually pressed.

Then, as shown in Fig. 7 (a), when the stop pin 13 crosses and protrudes inside the loop of the linear spring 130b of the dust spring 1 29, the dust spring 1 2 The pressing force of No. 9 is larger than the pulling force of the panel 13 4, so that the dust spring 12 9 is held at the intermediate position ①.

Also, in this state, the work W is cut by the cutter blade 3, and when the cut depth increases, the lower end of the line processing panel 130b contacts the upper surface of the work W as shown in (b). And can be lifted slightly.

When the wire-working spring 130b moves upward in this way, the stopper pin 133 is released from the restraint by the panel pressure of the dust spring 129 at this moment, and the side surface is pressed by the biasing force of the panel 334. Projecting to the side, and the loop of the line processing panel 130b is disengaged.

When the wire processing panel 130b comes off the stud pin 133, the wire processing panel 130b is pressed against the cutting groove W1 by the urging force of the panel portion 130, and thereafter, as shown in (c). Show As shown in the figure, the wire springs 130b of the dust springs 129 enter the grooves along the groove depths of the cutting grooves W1 until they engage with the restriction pins 132, At the same time, it descends to the regulation position where it engages with the regulation pin 13, and is held at the position of ③ following the power cutter blade 3.

In this state, most of the dust generated by the cutting operation of the cutter blade 3 is sucked along the dust suction port 8a, but as shown by the arrow in FIG. If some of the dust that cannot be collected at the front end of the wire attempts to flow backward in the cutting groove W1, it will collide with the rear end of the wire processing panel 130b and bounce off, almost all of it. The air is sucked into the fan casing 8 along the dust suction port 8a.

In this way, the dust that has not been rebounded on the front side can be further rebounded on the rear side to further increase the collection rate. In addition, since the dust springs 129/9 are restricted from moving in the left / right direction when the wire processing panel 130b penetrates into the cutting groove W1, a steering function for maintaining straightness is also provided. By the way, with this type of hand cutter, the hand cutter may be moved forward or backward or the cutting direction may be changed depending on the processing state. In such a processing form, the dust springs 12 29 may interfere in the groove, and may rather obstruct it. In such a case, as shown in Fig. 7 (d), the dust spring 1229 is manually rotated to the highest position 最高 and lifted, and in this state, the push button 13 3a is pressed down. When the stop pin 13 is cross-positioned below the wire-working spring 13 b and then the dust spring 12 is released, the dust spring 12 9 remains locked at the uppermost position ②. Inconvenience in the processing form can be avoided. Further, in the fan casing 8, a check valve 135 made of a rubber plate or the like for preventing backflow of dust is hinged to one end of a discharge surface of the exhaust pipe 8b, and covers the discharge surface.

While the motor is being driven, the check valve 135 opens due to the exhaust air pressure, and blows the dust inside while expanding the inside of the dust bag. As a result, the inside of the dust collecting bag is kept at a high pressure. In this state, when the motor is stopped, the dust tends to flow back into the fan casing 8 due to the negative pressure.

However, in the case of the present embodiment, the check valve 1 3 5 Closed, preventing backflow of dust and surrounding dirt due to backflow. FIGS. 8 and 9 show an example of the shape change of the dust spring of the second embodiment. The dust spring 140 shown in FIG. 8 is the front side of the wire machining spring 140b. A step 140a is formed at the uppermost position スト, and the stopper pin 133 is crossed at the position of the step 140a when the stopper 140a is locked at the uppermost position ②. Is the same.

In addition, the dust spring 150 shown in FIG. 9 is formed so that the joint position between the wire processing panel 13 Ob and the panel portion 130 is formed obliquely toward the lower portion, and the inclined portion 150 a The second embodiment is the same as the second embodiment except that the width of the width of the substantially oval loop is widened. _C the thus formed dust spring 1 4 0, 1 5 same effect also in the second embodiment with reference to 0 is obtained

FIG. 10 to FIG. 13 show a third embodiment of the hand cutter according to the present invention. Fig. 10 shows the case where the worker [i] is making a groove on the vertical wall. The worker [ii] supports the hand cutter body 201 with both hands while holding the concrete wall. A groove is formed in the workpiece W.

A bellows-shaped dust-absorbing hose 202 having one end connected to a dust-absorbing fan, which will be described later, is disposed at the rear of the main body 201. The other end of the dust-absorbing hose 202 is attached to a dust bag 203. They are linked via 204.

The attachment 204, which will be described later in detail, can also be used for the function of connecting the two and fixing the dust bag 203 to one side of the waist of the worker [A].

As shown in FIG. 11, the hand cutter main body 201 has a motor 210 and an output that changes direction by 90 degrees and rotates in a gear box (not shown) provided at the end of the motor 210. A shaft 2 1 2, a cutter blade 2 13 detachably connected to the output shaft 2 1 2, and a pair of not-shown output shafts 2 1 2 on the rear side of the cutter blade 2 1 3. An exhaust fan 2 14 for dust suction connected via a pulley and a belt, and a blade cover 2 17 covering the periphery of the cutter blade 2 13 integrated with the rear, and housed the above-described dust suction fan 2 16 A fan casing 218 is provided. The fan casing 2 18 has a dust opening 2 18 a at the bottom opening, and an exhaust pipe 2 18 b protruding from the rear side, to which the dust is absorbed via a connection attachment 2 19. Connected to one end of hose 202.

In addition, the main body 201 has a side handle 220 mounted on the blade cover 217 fixed in both vertical and horizontal directions so as to be changeable, and is integrally extended to the rear of the motor 210. Trigger handle 2 2 1 is provided, trigger switch 2 2 2 is arranged at the lower part, and electric cord 2 1 1 is connected at the rear end, improving the use and operability of operator [I] in two-handed operation The shape has been made.

The front side of the cover 2 17 is substantially perpendicular to the workpiece W at the cutting position of the workpiece W, and the cutter blade 203 protrudes from the front side. Inside the cover 2 17, a front slide cover 2 25 which is coaxial with the cover 2 and is urged to rotate forward by a winding spring or the like (not shown) is disposed. By further covering the outer periphery of the protruding cutter blade 2 13, safety during work is ensured.

A pair of guide rollers 226 that roll in contact with the installation surface for the workpiece W is disposed on the front outside of the cover 217 and the gearbox on the rear surface thereof. In addition, each guide roller, which is swingably fixed to the rear bottom surface of the fan casing 218 via a bracket 227 and has a rear support plate 228 in contact with the installation surface, is provided. In addition to the vertical guide function to prevent left and right inclination during cutting, the 2 26 and the rear support plate 2 28 provide a fan clearance by forming a predetermined gap D with the workpiece W. While ensuring the intake air volume of 2 16, dust is prevented from escaping to the side.

Reference numeral 229 denotes a dust spring for preventing rearward scattering, which is arranged near the bottom surface of the dust suction port 218a of the fan casing 218, and repels dust which is scattered rearward by cutting. It has a function to send the dust to the dust suction port 218 a of the fan casing 218.

Further, reference numeral 230 denotes a check valve made of rubber or the like provided at an outlet end of the exhaust pipe 218 b, and a dust knock due to the pressure in the dust knock 230 accompanying the motor stop. It has a backflow prevention function.

The hose 202 is a flexible hose made of vinyl chloride or the like in a bellows shape as shown in Fig. 12, and the insertion ends 202a at both ends are made of a somewhat hard PVC pipe. The material is elastically deformed by the outer peripheral pressure, but retains its shape.

The dust bag 203 is a flexible bag having a filter cloth formed by sewing and having an open upper end, which swells substantially along the thigh of the worker [a]. As shown in FIG. The upper end side dust suction port 203 a is narrowed down in a drawstring shape and fitted to the outer periphery of the insertion end 202 a of the hose 202.

As shown in Figs. 12 and 13, the attachment 204 used to connect the two is formed by winding a wire panel in a double coil shape, and the inner diameter of the wire panel is the insertion end 202 a of the hose 202. It consists of a ring spring 204 a set to a diameter enough to bite into the outer circumference, and a pair of pinch portions 204 b formed by bending both ends of the ring spring 204 a into a U-shape. By pinching b with a finger and pressing it, the diameter is expanded from the state shown in the figure, enabling attachment and detachment to the outer periphery of the connecting portion.

Therefore, at the time of connection, the ring spring 204a is fitted to the outer periphery of the dust suction port 203a, and the pinch portions 204b are pressed with fingers in this state. The connecting end 202a can be fitted to the inner periphery of the dust inlet 203a. When the pinch portion 204b is released in the fitted state, the ring spring 204a is reduced in diameter, and the two are firmly connected with one touch. When both are to be separated, they can be separated by one touch in the reverse order.

Further, each pinch portion 204 b also serves as a locking device for the band 205 worn by the worker [A], and as shown in the figure, both pinch portions 2 If the U-shaped part of 04a is inserted upward from the lower edge of the band 205, it will be inserted between the inside of the band 205 and pants (not shown), and will be engaged with the band 205. As a result, the dust bag 203 is mounted in a state of hanging on the waist of the worker [A].

The band 205 may be locked by inserting it into the pinch portion 204 b. _{= In} the figure, the hose 202 is connected to only the attachment 204. Although the dust bag 203 was connected, the dust bag 203 is a sewn product, so a string or the like is attached by sewing to the outer periphery of the dust inlet 203 a, and the outer periphery of the connected portion It is good to tie it with this string.

In the third embodiment configured as described above, the connecting portion between the dust bag 203 and the hose 202 can be securely and firmly connected by the ring spring 204 a of the attachment 204. The pinch portion 204b of the attachment 204 allows the ring panel 204a to be freely expanded and reduced in diameter, and allows one-touch attachment and detachment.

Furthermore, by inserting the pinch portion 204 b into the band 205, the dust bag 203 can be mounted in a suspended state around the waist of the worker, so that it does not disturb the work, and this part is hung. As a result, the hose 202 and the dust bag 203 can be supported without being crushed. Industrial applicability

As described above, the hand cutter according to the present invention is particularly suitable for indoor hanging work in which dust is prevented from scattering when forming a cut by cutting.

Claims

The scope of the claims

1. A cutter blade that rotates in connection with a motor, and a dust suction device that is disposed on the rear side of the cutter blade, rotates in connection with the cutter blade, and suctions dust generated in the cutting operation of the power cutter blade. A hand cutter comprising: an exhaust fan, and a fan casing accommodating the exhaust fan,

A rear anti-scattering material is provided on the rear side of the dust suction port of the fan casing so as to protrude downward on the same line as the power cutter blade and to fit into a cutting groove of the cutter blade. Characteristic hand cutter.

2. The rear scatter prevention member is composed of a flat plate that is swingably supported, and is provided with spring means for urging the plate to return to the vertical position when the plate swings. The hand cutter according to claim 1, wherein the hand cutter is mounted by mounting.

3. The hand cutter according to claim 1, wherein guide rollers are provided on both sides of an installation surface of the cutter blade with respect to the workpiece.

4. Attach two outer covers to the side surface of the blade cover that covers the periphery of the cutter blade, and match the outer cover with the blade cover and the outer cover in accordance with the position of the cutter blade. The hand cutter according to any one of claims 1 to 3, wherein a packing colored differently from the cover is interposed.

5. The rear scatter prevention member includes a dust spring provided behind the cutter blade, and the dust spring includes: a panel portion pivotally supported near a bottom surface of a dust suction port of the fan casing; and the panel portion. And a wire processing panel extending in a loop shape in a substantially oval shape at one end thereof and being inserted into a cutting groove of the force cutter blade by a biasing force of the panel portion. Hand cutter described in section.

6. The hand cutter as set forth in claim 5, wherein the spring means for holding the line processing panel at a position above the lower surface of the power cutter blade by staking the urging force of the panel portion. A hand cutter comprising:

7. The stopper means is provided in a state where the dust spring contacts the cutting surface. 7. The hand cutter according to claim 6, further comprising a stopper releasing means for hanging off from the dust spring. -

8. The hand cutter according to any one of claims 5 to 7, further comprising: a guide roller provided on both sides of an installation surface of the cover for covering the periphery of the cutter blade with respect to the workpiece, and a rear bottom surface of the fan casing. A rear support plate in contact with the cutting surface is rotatably provided, and a required gap is formed between the bottom surface of the facing and the cutting surface by the guide roller and the rear support plate. To a node cutter.

9. A front slide cover is provided inside the cover so as to be urged forward to cover an exposed portion of the cutter blade from the cover, wherein a front slide cover is provided. The hand cutter according to any one of the eight items.

10. The hand cutter according to claim 9, wherein the front slide cover is made of a transparent material.

11. The front slide cover is provided with a horizontally extending protrusion at the end thereof, and a V-groove for a cutting guide connected to the packing is provided on an upper surface of the front cover including the protrusion. 10. The hand cutter according to claim 9 or 10.

12. The hand cutter according to claim 9, wherein a dust holder packing that slides on a side surface of the cutter blade is provided at both ends of the front slide cover.

13. The hand cutter according to claim 5, wherein a check valve is provided at an outlet of the fan casing to open toward a discharge side by exhaust air pressure.

14. A cutter blade that rotates in connection with a motor, and is disposed at the rear side of the cutter blade, rotates in connection with the cutter blade, and sucks dust generated by the cutting operation of the cutter blade. A hand cutter body including an exhaust fan for dust suction, a fan casing containing the exhaust fan, and a flexible cutter having one end connected to the fan casing and the other end connected to a dust bag suction port. A hand cutter provided with a dust suction hose, A hand cutter provided with a connection attachment formed of a double coil-shaped ring panel that is fitted around the insertion end of the dust suction hose with respect to a dust suction port of the dust bag and connects the two.

15. The hand cutter according to claim 14, wherein the attachment has a pinch portion extending at both ends of the panel body for expanding the ring panel.

16. Each of the pinch portions is folded back into a U-shape, and the folded end portion can be inserted into an operator's band to serve as a hanging support for the dust bag. Item 14. The hand cutter according to item 14 or 15.