JPH11138334A - Hand cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand cutter with a dust collector which has a good operability improving the peripheral structure of a dust pipe, as well as improving the dust collecting performance, reducing the width of the hand cutter to make it compact, and improving the weight ballance. SOLUTION: Safety covers 6 and 6 furnishing dust collecting ports 6e at the positions lower than the line combining the axial core of a cutter blade 5 and the output shaft 1a of a driving source 1, are provided, and front guides 6n installed rotatable to the safety covers, and slide guides 6a provided rotatable to the front guides 6n, are furnished to this hand cutter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand cutter used for cutting secondary concrete products and the like, and more particularly to a hand cutter provided with a dust collecting device for preventing dust during work from scattering around.

[0002]

2. Description of the Related Art Hand cutters are U-shaped grooves buried in road gutters, fume pipes used as sewer pipes, secondary concrete products such as curbs on roads, bricks, asphalt paved roads, cast iron pipes for waterworks, and steel materials. It is widely used for cutting and the like. The dust is scattered around the cutting work of secondary concrete products, bricks and asphalt paved roads by this hand cutter, which is a problem in terms of the health of workers, especially in urban areas where there are many complaints due to dust. is there. In order to solve such a problem, recently, a hand cutter with a dust collector has been developed. As one example of the prior art of the hand cutter, utility model registration No. 2530503 will be described with reference to FIG. An opening 5 is provided in the safety cover 52 surrounding the cutter blade 51.
4 are provided. The opening 54 communicates with a suction port 57 of a dust suction device 56 via a pipe 55. Dust suction device 5
The exhaust pipe 59 communicates with the dust collection bag at the exhaust port 58 of FIG. The small pulley 61 is rotated by the output shaft of the engine 60. The rotation of the small pulley 61 is transmitted via a belt to rotate the large pulley, thereby rotating the fan 69. The rotation of the large pulley is transmitted via a belt to rotate the small pulley to rotate the cutter blade 51.

Japanese Patent Publication No. Hei 7-14570 will be described as two examples of the prior art of the hand cutter with reference to FIGS. In order to reduce the output rotation speed of the engine 110, the small pulley 97 of the engine output shaft and the pulley 98 of the shaft on the side of the blade 78 are connected to the large pulley of the composite pulley 99 through two large and one small composite pulleys 99. The belt 100 to be hung is hung on a small pulley 96 installed on the drive shaft 95 of the forced dust fan 89. Above the safety cover body 71 that covers the blade 78, a dust discharge device 80 is provided. A hole is formed in the side wall of the safety cover main body 71 to serve as a dust inlet 79 of the dust exhaust device 80. Inside the safety cover main body 71, a partition wall 82 having a slit that does not hinder the rotation of the blade 78 surrounds the dust inlet 79 and extends near the center of the blade 78 as a wall surface of the dust passage 81. The exhaust pipe 90 connected to the exhaust device 80 extends rearward from above the safety cover body 71.

[0004]

However, the hand cutter disclosed in Utility Model Registration No. 2530503 has the structure shown in FIG.
As shown in FIG. 7, there are the following problems. (1) Since the opening 54 at the top of the safety cover and the dust suction device 56 are communicated with each other by the pipe 55, the pipe cannot be compactly arranged in appearance, and the pipe 55 comes into contact with the worker during the work. In addition, the workability is poor because the pipe 55 is in the way, and there is a possibility that the pipe 55 may be caught by something during the work and may be damaged. (2) Since the entire width of the hand cutter is large and the eccentric weight is large instead of the compact, handling during work is not good. (3) Since the safety cover is configured so as to rotate as a whole with the center of rotation of the cutter blade as a rotation fulcrum, the followability of the safety cover due to a change in the working posture is poor, and the dust absorption performance is reduced, and the workability is poor. .

The hand cutter disclosed in Japanese Patent Publication No. Hei 7-14570 has the following problems as shown in FIGS. (1) A dust discharging device 80 is provided above the safety cover main body 71, and dust generated when cutting with the blade 78 passes through the dust discharging passage 81 of the safety cover main body 71 and is discharged from the dust discharging device 80. Is stored in a dust bag (not shown) via a dust pipe 90, so that the cutting device
Since the distance to 0 is long and there is a lot of dust scattered around, it is not always possible to absorb all the dust, so that the dust absorption performance is poor. Therefore, there are complaints about the health of workers and dust in urban areas. (2) Since the dust pipe 90 is poorly handled and has a structure projecting toward the worker, the dust pipe 90 comes into contact with the worker's body or the like, thereby hindering workability. (3) Dust exhaust device 80 and compound pulley 9 on safety cover 71 side
Since many parts such as 9 are integrated, the weight on the tip side of the hand cutter is heavy and the weight balance is poor, so that the structure is difficult for an operator to handle. (4) Since dust is sucked in from the side of the safety cover main body 71, the dust absorbing efficiency is poor. (5) Dust exhaust device 8 near the left hand handle of the hand cutter
Since 0 is arranged, in order to secure clearance around the handle, the handle becomes large and the overall length becomes long, so that compactness cannot be achieved.

The present invention focuses on the above-mentioned conventional problems, improves the dust-absorbing performance, reduces the width of the hand cutter to make it compact, improves the weight balance, and improves the operability of the dust pipe by improving the handling of the dust pipe. An object of the present invention is to provide a hand cutter with a dust collector.

[0007]

To achieve the above object, a first invention of a hand cutter according to the present invention is connected to a drive source such as an engine and a motor and an output shaft of the drive source. In a hand cutter having a driving device, a cutter blade rotated by the driving device, and a safety cover covering the cutter blade, a position below a line connecting the axis of the cutter blade 5 and the output shaft 1a of the driving source 1. And a safety cover 6, 6c provided with a dust suction port 6e. According to the above configuration, the hand cutter of the present invention includes the safety cover provided with the dust suction port below the line connecting the axis of the cutter blade and the output shaft of the driving source. Dust can be sucked directly from the provided dust suction port, so that dust collection performance is improved. In addition, since a dust suction port is provided below the safety cover, dust is sucked directly from this dust suction port into a dust suction device consisting of a dust suction fan. Since the dust is not sucked into the dust suction device including the dust suction fan via the dust pipe, a compact hand cutter having a simple structure can be provided. Further, the dust can be efficiently sucked even by a small dust suction fan so that the dust is not scattered around. Furthermore, by providing a dust suction port below the line connecting the axis of the cutter blade and the output shaft of the drive source, a dust suction device consisting of a dust suction fan is arranged near this dust suction port, as in the prior art. The problem that the dust pipe protrudes above the power unit and safety cover and obstructs the work is eliminated, and dust is sucked into the dust bag via the dust pipe from the dust suction device provided below the hand cutter, and the dust pipe is managed. Is improved, and the dust pipe does not protrude around the safety cover and the power unit, so that a compact, easy-to-handle and smart-looking hand cutter can be obtained. In addition, since a dust suction port is provided below the safety cover, different specifications (for example, 1
(2 inches or 14 inches), the cutter blade can be replaced without replacing the safety cover. Further, since the dust suction port is provided below the safety cover, the dust suction device can also be disposed below the line connecting the axis of the cutter blade and the output shaft of the drive source. The problem that the visibility of the cutting edge of the cutter blade is poor due to the dust pipe or the dust pipe is solved.

According to a second invention, in the configuration of the first invention, a front guide 6n rotatably attached to the safety covers 6, 6c and a slide guide 6a rotatably attached to the front guide 6n. This is a configuration provided with. According to the above configuration, in addition to the functions and effects of the first invention,
By rotating the front guide and the slide guide according to the working posture of the hand cutter, the cutting angle or the cutting position of the cutter blade can be easily changed, so that the workability is good.

According to a third aspect of the present invention, in the configuration of the second aspect, the front guide 6n has a rotation fulcrum at or near the center of rotation of the cutter blade 5, and the slide guide 6a has a rotation guide of the front guide (6n). The configuration is such that the vicinity of the tip portion is used as a rotation fulcrum. According to the above configuration, in addition to the operation and effect of the second invention, even if the shape and size of the front guide and the slide guide are appropriately set depending on the type of the hand cutter, the front guide is
The rotation center of the cutter blade or its vicinity is used as a rotation fulcrum. Further, the slide guide can be housed in the safety cover by using the vicinity of the front end of the front guide as a rotation fulcrum. Therefore, the dust at the time of cutting can be guided through the front guide and the slide guide stored in the safety cover to the dust suction port provided at the lower portion of the safety cover even when the front guide is completely stored in the safety cover. And the dust absorption performance is improved.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the safety covers 6, 6c
And the front ends of the safety covers 6 and 6c near the cutting position of the cutter blade 5 are connected by a straight line. According to the above configuration, dust at the time of cutting can be easily guided to the dust suction port provided in the safety cover. Thereby, as described above, the dust suction port is arranged above the safety cover in the conventional hand cutter shown in FIG. 20, but according to the present invention, the dust is efficiently and directly sucked even with a small dust suction fan. And the dust absorbing performance is improved.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, a dust stopper for preventing scattering of dust on a line connecting the rotation center of the cutter blade 5 and the dust inlet 6e. 6f is provided. According to the above configuration, the dust stopper provided at a predetermined position of the safety cover at the time of cutting can prevent the dust stopper from scattering upward from the inner surface of the safety cover. Thus, when the dust at the time of cutting hits the dust stopper, it falls down and is efficiently sucked into the dust suction port, so that it is prevented from scattering around.

A sixth invention, a driving source such as an engine or a motor, a cutter blade driven from the driving source via driving means, a safety cover covering a part of the outer periphery of the cutter blade and having a dust suction port for dust, And a shaft connected to the dust suction port 6e and driving the cutter blade 5, or an axis connecting the rotation center of the cutter blade 5 and the center of the output shaft 1a of the drive source 1. A configuration in which a dust suction device 4 including a dust suction fan is provided at a lower position, or a dust suction device is provided at a position below the hand cutter and separately provided via a dust pipe from the dust suction port 6e provided in the safety cover 6, 6c. It is what it was. According to the above configuration, the structure is simple and compact, the dust-absorbing performance is improved, and the hand cutter can be easily handled.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hand cutter according to the present invention will be described below with reference to FIGS. The hand cutter 30 of the present invention includes a power unit that houses a driving source 1 such as an engine and a motor, and an output shaft 1 a of the driving source 1.
, A cutter blade 5 connected to the output shaft 1 a of the drive source 1, a cutter head 25 rotatably supporting the cutter blade 5, and a cutter blade 25 connected to the output shaft 1 a of the drive source 1. And a cutting head unit comprising safety covers 6 and 6c covering the unit 5. The dust suction device 4 includes a dust suction fan 4b and a driving device 2 for driving the dust suction fan 4b.
The dust storage unit 3 is referred to as a dust suction unit 3. First, FIG. 1 shows a side view of a hand cutter 30, and an output shaft (not shown) of a drive source 1 (hereinafter, referred to as a drive source 1) such as an engine or an electric motor sucks dust, which will be described in detail later. It is connected to a driving device 2 including a pulley and a belt for driving a dust suction device 4 including a dust suction fan. An output shaft (not shown) of the driving source 1 includes a pulley, a belt, and a gear, which will be described in detail later, and is connected to a driving device 40 that drives the cutter blade 5. The safety cover 6 is provided so as to cover the cutter blade 5. In the safety cover 6, a front guide 6n and a slide guide 6a are provided so as to be stowable. The dust suction device 4 composed of a dust suction fan, which will be described in detail later, is connected to a dust bag 35 that stores dust via a dust pipe 35A. Reference numerals 1A and 20 denote handles. The operator holds the handle 1A with the right hand and the handle 20 with the left hand so that the hand cutter can be easily handled.

A case 10 is detachably attached to a lower side surface of the drive source 1 shown in FIG. The output shaft 1a of the drive source 1 is inserted into an insertion hole provided in the case 10,
The coaxial 1a protrudes from the side of the case 10. As shown in FIG. 13, the output shaft 1a is connected to a pulley 7b for driving a dust suction device composed of a dust suction fan 4b and a pulley 7a for driving a cutter blade. A drive pulley 2 having a smaller diameter than the dust suction device drive pulley 7b is rotatably attached to the case 10 by a shaft 2a. The driving pulley 7b and the driving device 2 are wound around a belt 9.
Reference numeral 8 denotes an idler pulley for adjusting the tension of the belt. The driving device 2 is rotatably mounted by a dust suction fan 4b and a shaft 2a. The dust suction device 4 includes a dust suction fan 4b, a dust suction case 4f shown in FIG. 8, a dust suction port 4g, and a dust discharge port 4a shown in FIG.

The cutter blade 5 is rotatably mounted on a shaft 5a mounted on the cutter head 25. The driven pulley 11 has a shaft 11 attached to the cutter head 25.
a so as to be rotatable. A cutter blade driving pulley 7a connected to the output shaft 1a and a driven pulley 11 are wound around a belt 12. The driven pulley 11 drives a gear of a driving device 40 of the cutter blade 5 described later in detail.
The safety cover 6 is detachably or integrally formed with a cutter head 25 that rotatably supports the cutter blade 5 shown in FIG. The cutter head 25 and the case 1
0 is attached by stud bolts 15 and 16 shown in FIG.

A front guide 6n and a slide guide 6a are accommodated in a lower safety cover 6c integrally formed below the safety cover 6 shown in FIGS. 6b is a guide roller. The slide guide 6a shown in FIG. 3 is constantly urged in the lower right direction shown in the figure by a spring 6s, and uses a pin 6t at the tip of the front guide 6n as a rotation fulcrum. For this reason, when working by holding the handle 20 shown in FIG. 2 by hand, by pushing the hand cutter 30 in the direction of the guide roller 6b, the slide guide 6a is fixed to the safety cover 6 against the spring 6s. It can be stored along the bottom of the lower safety cover 6c. When a force is not applied in the direction of the guide roller 6b by changing the working posture of the hand cutter 30, the slide guide 6a is protruded from the lower safety cover 6c to the lower right by the spring 6s as shown in FIG. It has become. The front guide 6n is provided with a long hole 6h for enabling rotation. The lower safety cover 6c has a guide pin 6
m is fixed. The front guide 6n is a long hole 6h
A guide pin 6m is inserted into the shaft, and is constantly urged to the lower right by a spring 6g, and the pin 6q is used as a rotation fulcrum. Thus, when working with the handle 20 shown in FIG. 2 by hand, the hand guide 30 is added in the direction of the guide roller 6b to thereby provide the front guide 6n.
Can be housed in the lower safety cover 6c fixed to the safety cover 6 against the spring 6g.
When no force is applied in the direction of the guide roller 6b by changing the working posture of the hand cutter 30, the front guide 6n is protruded from the lower safety cover 6c to the lower right by the spring 6g as shown in FIG. It has become. The pins 6p and 6q serving as rotation fulcrums of the front guide 6n and the slide guide 6a shown in FIG. 3 are located near the shaft 5a of the cutter blade 5 on the side surface of the safety cover. The rotation fulcrum of the guide 6a may be the shaft 5a of the cutter blade 5.

By the action of the front guide 6n and the slide guide 6a, the cutting angle or the cutting position of the cutter blade 5 can be changed according to the working posture of the hand cutter 30, so that workability is good. A guide roller 6d is rotatably attached to the slide guide 6a, and the guide roller 6d of the cover 6a is
The slide guide 6a is linearly movable along the bottom of the lower safety cover 6c, and slides within the range of the elongated hole 6h against the spring 6g to be housed in the lower cover 6c. ing. A dust stopper 6f is attached to the safety cover 6. This dust stopper 6f
Is provided with a slit which does not hinder the rotation of the cutter blade, and the cutter blade 5 is rotatable in this slit. Also, this dust stopper 6f
Serves to prevent dust from scattering above the safety cover 6 and guides the dust to a dust suction port 6e provided in the safety cover 6. This dust stopper 6f
Is linearly formed of an elastic material such as rubber, for example, and is provided detachably with respect to the safety cover.
It is easy to insert the cutter blade into the slit of the dust stopper 6f, and the assembling property is good.

As shown in FIG. 3, dust scattered at the time of cutting a concrete secondary product or the like is sucked from a dust suction port 4g of a dust suction case 4f by a rotary drive of a dust suction fan 4b by a cutter blade 5 described later in detail. It is stored in the dust bag 35 from the dust outlet 4a shown in FIGS. Thus, the dust pipe 3
5A is disposed below the drive source 1, so that the handling of the dust pipe 35A from the dust suction fan 4b is significantly improved as compared with the related art, and the cutting pipe 5A comes close to the body of the worker during cutting work and becomes obstructive. Alternatively, the visibility of the cutting edge of the cutter blade is not obstructed.

Next, the front guide 6n, the slide guide 6a, the dust suction port 6e, and the dust suction device 4 will be described with reference to FIGS. FIG. 4 shows a left side view of the hand cutter. The dust suction device 4 includes an output shaft 1 a of the drive source 1.
And a line A connecting the shaft 5a of the cutter blade 5 to the axis of the cutter blade 5. As described above, by pushing the hand cutter 30 in the direction of the guide roller 6b, the front guide 6n and the slide guide 6a
Are stored in the lower safety cover 6c at the positions indicated by the dotted lines. FIG. 5 shows a state in which the front guide 6n and the slide guide 6a protrude from the lower safety cover 6c. FIG. 6 shows that the front guide 6n is in the X direction of the arrow and the slide guide 6a is in the Y direction of the arrow. It shows a state in which they are separately stored in the lower safety cover 6c. Thereby, the dust during the cutting operation is guided from the front guide 6n and the slide guide 6a to the dust suction port 6e. A dust suction device 4 including a dust suction fan is disposed near the dust suction port 6e. With this configuration, it is not necessary to connect the dust suction port and the dust suction device with a pipe as in the related art as described above, and the dust suction device can be directly connected to the dust suction port that sucks the dust of the safety cover. In addition, a compact and simple hand cutter can be provided.

FIG. 7 shows another embodiment of the hand cutter. Components denoted by the same reference numerals as those in FIGS. 1 to 6 have the same functions, and thus description thereof is omitted here. According to FIG.
The dust suction device is installed at a predetermined place in the work site, and the hand cutter is provided with a dust port 35B for sucking dust guided from the front guide 6n and the slide guide 6a in the lower safety cover 6c. The dust sucked from the dust port 35B is sent to a dust suction device (not shown) via a dust pipe 35c. As a result, the weight of the hand cutter can be reduced, so that the hand cutter can be easily handled during the cutting operation. In this case as well, the dust pipe 35c is located below the driving source 1 as described above, so that the hand cutter has a good weight balance and is compact and easy to handle.

FIG. 8 as viewed in the direction Z in FIG. 2 will be described with reference to FIGS. Coupling member 1 composed of a coupling and a bearing coupled to spline 1c to output shaft 1a of drive source 1
Drive pulleys 7a and 7b are rotatably attached to the shaft 5 and the shaft 1b connected to the joint member 15. A dust suction fan 4b disposed below the drive pulleys 7a and 7b;
The drive device 2 is rotatably mounted on a shaft 2a. 4d is a bearing for supporting the shaft 2a. Dust suction device 4
Is composed of a dust suction fan 4b, a dust suction case 4f, a dust suction port 4g, and a dust discharge port 4a shown in FIG. The drive pulley 7b and the drive device 2 shown in FIG. As a result, the rotation output of the output shaft 1a of the drive source 1 is transmitted to the drive device 2 via the drive pulley 7b and the belt 9, whereby the dust suction fan 4b is driven to rotate.

Next, FIG. 9 shows a state in which the driving source 1, the driving device 2, and the dust suction device 4 are integrally assembled. 1 to 3 have the same functions, and a description thereof will be omitted. A handle 20 is attached to the power unit that houses the drive source 1. A leg 22 is fixed to the lower portion of the power unit and the case 10. A guide groove 10 c for guiding the belt 12 is formed in the case 10. An adjustment plate 10 a for adjusting the tension of the belt 9 is attached to the case 10, and the plate 10 a is provided with a long hole 10 b that allows the belt adjustment pulley 8 to move. As shown in FIG.
Work with the foot, and leg 2 when not working
2 is placed on the ground or floor to support the weight of the hand cutter.

FIG. 10 shows a state in which the cutter blade 5, the safety cover 6, the slide guide 6a and the cutter head 25 are integrally assembled. 1 to 3 have the same functions, and a description thereof will be omitted. The safety cover 6 and the cutter head 25 are detachably or integrally formed. Stud bolts 15 and 16 for attaching the case 10 shown in FIG. 2 are attached to the cutter head 25. FIG.
Is formed in a U-shape. The dust at the time of cutting by the cutter blade 5 is guided from the slide guide 6a to the dust suction port 4g shown in FIG. 8 through the lower safety cover 6c and the dust suction port 6e. FIG. 11 shows a state in which the slide guide 6a is housed in the lower safety cover 6c, and FIG.
Shows a state in which the slide guide 6a shown in FIG. 6 is urged by the spring 6g and protrudes outward from the lower cover 6c.

Next, a driving device for a hand cutter according to the present invention will be described with reference to FIGS. FIG.
FIG. 14 shows a power transmission system of the entire hand cutter represented by a symbol. The output shaft 1a of the drive source 1 shown in FIG. 13 is connected to the drive pulleys 7a and 7b.
The driving pulley 7a includes a driven pulley 11 and a belt 12
It is wound by. The power output from the output shaft 1a is transmitted from the driving pulley 7a to the driven pulley 11 via the belt 12. This driven pulley 11
The 1st gear 11b shown in FIG. 14 of the P section detailed view of FIG. 13 is driven. The first gear 11 meshes with the second gear 11c to drive the same gear 11c. This second gear 11c
Engages with the third gear 11d to drive the gear 11d. The third gear 11d meshes with the fourth gear 11e to drive the same. This fourth gear 11e
Drives the cutter blade 5 with the shaft 5a as a rotation fulcrum.
Can be driven to rotate.

FIG. 15 shows the arrangement of a driving pulley and a driven pulley. An axis A connecting the center of the output shaft 1a and the center of the shaft 11a of the driven pulley 11;
The angle formed between the center of a and the axis B connecting the center of the shaft 2a of the driving device 2 is set to a predetermined angle α1. The center of the output shaft 1a and the center of the shaft 2a of the driving device 2 are set to be separated by a predetermined distance L1. As a result, the driving device 2 is disposed at an appropriate position, the weight balance of the hand cutter is good, and the structure is simplified, so that the entire hand cutter becomes compact.

FIG. 16 shows a power transmission system of the cutter blade described with reference to FIGS. In the driving device 40 of the cutter blade 5, the output shaft 1a of the driving source 1 is connected to the driving pulley 7a. The driven pulley 11 is wound around a belt 12. As a result, the power output from the output shaft 1a is transmitted from the driving pulley 7a to the driven pulley 11 via the belt 12. The driven pulley 11 drives the small-diameter first gear 11b. This small diameter first gear 11 meshes with the large diameter second gear 11c to drive the same gear 11c. The large-diameter second gear 11c meshes with the small-diameter third gear 11d to drive the same gear 11d. The small-diameter third gear 11d meshes with the large-diameter fourth gear 11e to drive the same gear 11e. By driving the fourth gear 11e having a large diameter, the shaft 5 is driven.
The cutter blade 5 is driven to rotate via the a. As described above, the rotation speed of the output shaft 1 a
The speed is reduced by each of the 0 gears 11b, 11c, 11d, and 11e, and the cutter blade 5 is driven by a predetermined rotation. Drive pulleys 7a and 7b are rotatably attached to a coupling connected to the output shaft 1a by a spline 1c, a joint member 15 composed of a bearing, and a shaft 1b connected to the joint member 15.

As described above, the main features of the conventional hand cutter of the present invention which has solved all the above-mentioned problems are as follows. The hand cutter of the present invention has the safety cover provided with the dust suction port at a position below the line connecting the axis of the cutter blade and the output shaft of the drive source. Since dust can be sucked in, dust absorption performance is improved.

Since the dust suction port is provided below the safety cover, the dust is sucked directly from the dust suction port into the dust suction device including the dust suction fan. Through a dust pipe from
Since the dust is not sucked into the dust suction device including the dust suction fan, a hand cutter having a simple structure and a compact structure can be obtained.

Since a safety cover having a dust suction port is provided below a line connecting the axis of the cutter blade and the output shaft of the drive source, the dust can be efficiently sucked even by a small dust suction fan. It can be prevented from scattering around.

A dust suction port is provided below a line connecting the axis of the cutter blade and the output shaft of the drive source, and a dust suction device including a dust suction fan is disposed near the dust suction port. The problem that the dust pipe protrudes above the safety cover and hinders work is eliminated, and dust is sucked into the dust bag via the dust pipe from the dust suction device provided below the hand cutter, and the handling of the dust pipe has been improved. Since the dust pipe does not protrude around the safety cover and the power unit, the hand cutter can be made compact, easy to handle and smart in appearance.

Since the dust suction port is provided below the safety cover, the cutter blade can be replaced without replacing the safety cover even if the cutter blade has a different specification (for example, 12 inches or 14 inches).

Since the dust suction port is provided below the safety cover, the dust suction device is also disposed below the line connecting the axis of the cutter blade and the output shaft of the drive source. However, the problem that the visibility of the cutting edge of the cutter blade is poor because the view is blocked is solved.

By turning the front guide and the slide guide according to the working posture of the hand cutter, the cutting angle or the cutting position of the cutter blade can be easily changed, so that the workability is good.

Even if the shapes and sizes of the front guide and the slide guide are appropriately set depending on the type of the hand cutter, the front guide is used as a rotation fulcrum at or near the center of rotation of the cutter blade. Further, the slide guide can be housed in the safety cover by using the vicinity of the front end of the front guide as a rotation fulcrum.

Dust from the cutting can be guided through a front guide and a slide guide stored in the safety cover to a dust suction port provided under the safety cover even when the front guide is completely stored in the safety cover. It becomes possible and the dust absorption performance is improved.

Since the dust suction port provided on the safety cover and the tip of the safety cover near the cutting position of the cutter blade are connected by a straight line, dust at the time of cutting is easily led to the dust suction port provided on the safety cover. be able to. As a result, dust can be efficiently sucked by a small dust suction fan even with a small dust suction fan, and the dust suction performance is improved.

When the dust at the time of cutting hits a dust stopper provided at a predetermined position of the safety cover, it falls down and is efficiently sucked into the dust suction port, so that it is prevented from scattering around.

According to the present invention, it is possible to provide a hand cutter which has a simple and compact structure, has improved dust absorbing performance, and is easy to handle.

Although the present invention has been described as a hand cutter for cutting concrete secondary products and the like, it is needless to say that various cutter blades can be prepared and applied to a hand cutter for cutting metal or wood. No.

[Brief description of the drawings]

FIG. 1 is a side view in which a dust bag is connected to a hand cutter of the present invention.

FIG. 2 is a right side view of the hand cutter.

FIG. 3 is an explanatory view of a slide guide that slides on a safety cover.

FIG. 4 is a left side view of the hand cutter.

FIG. 5 is a diagram illustrating a state where the front guide and the slide guide protrude from the lower safety cover.

FIG. 6 is a diagram illustrating a state where the front guide and the slide guide are stored in a lower safety cover.

FIG. 7 is a diagram illustrating another example of a hand cutter.

FIG. 8 is a Z view of FIG. 2;

FIG. 9 is a view for explaining a state in which the drive source, the drive device, and the dust suction device are integrally assembled.

FIG. 10 is an explanatory view of the safety cover with an exterior cover attached thereto.

FIG. 11 is a diagram illustrating a state in which a slide guide is stored in a lower safety cover.

FIG. 12 is a view for explaining a state in which the slide guide is biased by a spring and projects outward with respect to the lower safety cover.

FIG. 13 is a diagram illustrating a power transmission sequence of the hand cutter using symbol symbols.

FIG. 14 is a detailed view of a part P in FIG. 9;

FIG. 15 is a diagram illustrating a mounting angle and a mounting position with respect to a driving source, a driving pulley, a driven pulley, and a driving device.

FIG. 16 is an explanatory view of each gear for transmitting power of the hand cutter.

FIG. 17 is a side view of a conventional example of a hand cutter.

FIG. 18 is a top view of two conventional hand cutters.

FIG. 19 is an explanatory diagram of a drive system of the hand cutter of the two examples.

FIG. 20 is an explanatory view of two examples of the safety cover.

[Description of Signs] 1 ... drive source, 2 ... drive device for dust suction fan, 4 ... dust suction device, 4b ... dust suction fan, 5 ... cutter blade, 6 ... safety cover, 6a ... slide guide, 6c ... lower safety cover, 6n ... Front guide, 7a, 7b ... Driving pulley, 9, 12 ... Belt, 11 ... Driven pulley, 40 ...
Driving device for cutter blade.

Claims (6)

[Claims] 1. A hand cutter having a drive source such as an engine and a motor, a drive device connected to an output shaft of the drive source, a cutter blade rotated by the drive device, and a safety cover covering the cutter blade. In the above, the axis of the cutter blade (5) and the output shaft (1) of the drive source (1)
A hand cutter comprising a safety cover (6, 6c) provided with a dust inlet (6e) at a position below a line connecting to (a). 2. A front guide (6n) rotatably attached to the safety cover (6, 6c), and a slide guide (6a) rotatably attached to the front guide (6n). The hand cutter according to claim 1, wherein: 3. The hand cutter according to claim 2, wherein
The front guide (6n) has a rotation fulcrum at or near the center of rotation of the cutter blade (5), and the slide guide (6a) has a rotation fulcrum near the tip of the front guide (6n). A hand cutter characterized by the following. 4. A dust inlet (6e) provided in a safety cover (6, 6c).
And the safety cover near the cutting position of the cutter blade (5)
The hand cutter according to any one of claims 1 to 3, wherein the hand cutter (6, 6c) is configured to be connected to the tip portion with a straight line. 5. A cutter blade (5), a rotation center, and a dust suction port.
The hand cutter according to any one of claims 1 to 4, wherein a dust stopper (6f) for preventing scattering of dust is provided on a line connecting to (6e). 6. A drive source such as an engine or a motor, a cutter blade driven by the drive source via a drive device, and a safety cover covering a part of the outer periphery of the cutter blade and having a dust suction port for dust. In a hand cutter, the cutter blade (5) is connected to the dust suction port (6e).
The axis of the driving device that drives the blade or cutter blade
Provide a dust suction device (4) consisting of a dust suction fan below the axis connecting the rotation center of (5) and the center of the output shaft (1a) of the drive source (1), or at a position below the hand cutter and safely. A hand cutter, comprising: a dust suction device separately provided from the dust suction port (6e) provided in the cover (6, 6c) via a dust pipe.