JPH06262428A - Safety cover with dust removing fan and cutter device having safety cover with dust removing fan - Google Patents

Abstract

PURPOSE:To attain high dust removing efficiermcy by providing a dust removing port partly in a safety cover provided so as to cover an edge tool by protruding only partly the disk-shaped edge tool, and providing a dust remover driven simultaneously by an edge tool driving motor to apper in this dust removing port. CONSTITUTION:In a cutter device provided with a cutter blade 15 rotated through a pinion gear train 14, joint shaft and a bevel gear train by rotating a drive motor 10 integrally provided with a handle 9, a safety cover 1 for covering the cutter blade 15 so as to expose only partly an edge point is provided. In this safety cover 1, a clearance between its inside and the cutter blade 15 serves as a dust removing passage 2, and in the narrowest part thereof, a dust removing inlet 11 of a dust remover 3, integrally provided with the safety cover 1, is provided. This dust remover 3 has a dust removing fan 7 rotated similarly by the drive motor 10, and a suction side of the remover is provided to appear in the dust removing inlet 4, to connect a dust removing pipe 36 to a delivery side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety cover with a dust fan and a cutter device having a safety cover with a dust fan, which is used by being attached to a cutting tool such as an engine cutter or a circular saw. The body segment structure is a term used to describe crustaceans, and is used below as a term expressing the technical idea of the present invention.

[0002]

2. Description of the Related Art The present invention is a prior art Japanese Patent Application No. 5-27459.
Belongs to an improved invention based on.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to develop a new technology for more efficiently and completely achieving the dust removal effect disclosed in the above-mentioned prior art. Another object of the present invention is to obtain a cutter device having a safety cover with a dust exhaust fan with good weight balance. In the prior art, in the former case, the dust ejected by the cutting work vigorously flows into the dust exhaust passage formed by the clearance between the outer peripheral arc of the safety cover and the outer periphery of the disc-shaped blade whose diameter gradually increases, and the safety cover The point of the prior art is that the internal partition wall has an escape area only to be sucked out from the dust inlet provided on the side surface of the safety cover, and that the action creates a dust effect which has not been found in the past. However, referring to the drawing of Japanese Patent Application No. 5-27459, the technique of facing the dust inlet of the dust removing device to the narrowest part of the dust passage is to make the dust inlet on the side surface of the safety cover. Has been specified. Therefore, it is also true that the partition inside the safety cover can only escape from the dust inlet, but from the perspective of the flow of dust that has flown vigorously toward the dust passage, the side surface of the safety cover is not perforated. At the provided dust inlet, the dust is sucked out from the side with respect to the flow of the dust, which causes a problem in the dust discharging efficiency. In the latter, since the dust removing device is installed on the side of the safety cover, it is easy to generate an unbalance moment, and it is easy to obtain a cutter device having a safety cover with a dust removing fan with a poor weight balance.

[0004]

In order to eliminate the above-mentioned drawbacks, the present invention is a safety cover that exposes and encloses only a part of the cutting edge of a circular blade, and the diameter of the outer circumferential arc of the safety cover is gradually increased. And a clearance between the inside of the safety cover having the outer circumferential arc and the cutting edge of the circular cutting tool is provided as a dust discharging passage, and the clearance of the dust discharging device is provided at the narrowest part of the dust discharging passage. The dust collector faces the dust inlet, the dust collector is integrally provided on the outer side surface of the safety cover, and the inside of the safety cover has a partition wall formed with a slit that does not hinder the rotation of the circular blade. While using the partition wall which also functions as a dam of the dust inlet, this safety cover is extended so that it extends as a wall surface of the dust passage to the vicinity of the center of the circular blade and the area surrounding the circular blade can be elastically changed. Main body and movable body In a safety cover having a double-wing storage type rounded end face having a dust removal device, which is divided into a body segment structure in which a spring force is interposed, and a radial edge line of the safety cover is a rounded end face, The dust inlet of the dust collector provided at the narrowest part of the dust passage is formed in the back surface holding both sides of the safety cover, and the drive shaft of the dust fan of the dust collector is installed in the back. Safety cover with dust removal fan (A type), which is arranged so as to project from the surface
And a dust pipe that serves as a dust passage of the safety cover (A type) with a dust fan is connected to a dust outlet of a dust collector, and an exhaust pipe communication port of an internal combustion engine is installed in the middle of the dust pipe. Safety cover with dust removal fan (B
Type) and the safety cover with the dust-exhaust fan and the drive motor are joined so that the rotary shaft of the drive motor having the handle protrudes toward the back surface of the safety cover with the dust-exhaust fan of type A, The gear installed at the tip of the rotary shaft of the drive motor is meshed with the gear installed at the tip of the drive shaft of the dust-exhaust fan and the gear installed at the tip of the joint shaft for inputting rotational force to the cutter blade. A cutter device having a safety cover with a dust collecting fan and a rotary shaft of an engine having a handle projecting in a tangential direction of a back surface of the safety cover with a dust collecting fan of type B. , The safety cover with the dust-exhaust fan and the engine are joined together, and the rotational output of the rotary shaft of the engine is transmitted to the drive shaft in the orthogonal direction by using a bevel gear, and the drive shaft is rotated. Installed so that the axis of the drive shaft and the axis of the drive shaft of the dust-exhaust fan of the safety cover with the dust-exhaust fan have the same direction and are parallel to each other. A belt is hung on a pulley provided at the tip of the drive shaft, and a gear provided at the end of the drive shaft is meshed with a gear provided at the tip of a joint shaft for inputting a rotational force to the cutter blade. The present invention aims to provide a cutter device having a safety cover with a dust exhaust fan, respectively.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A safety cover having a double-wing storage type rounded end face having a dust removing device disclosed in Japanese Patent Application No. 5-27459 will be simply referred to as a safety cover, and one embodiment of the present invention will be described with reference to the drawings. Then, the dust inlet (4) of the dust collector (3) provided in the narrowest part of the dust passage (2) of the safety cover is provided with the back surface (6) which holds both side surfaces (5) of the safety cover. ). The dust removing device (3) is a device in which a dust collecting fan (7) is housed in a housing, and the housing is provided with a dust collecting inlet (4) on which suction force generated by rotation of the dust collecting fan (7) acts. . Exhaust fan (7)
Drive shaft (8) extends out of the housing. Both the safety cover and the dust collector (3) are arranged and joined so that the drive shaft (8) is oriented so as to project from the back surface (6) of the safety cover. When the two are joined, the dust inlet (4) is synonymous with the hole formed in the back surface (6) of the safety cover. In this way, the dust inlet (4) of the dust collector (3) is bored on the back surface (6) of the safety cover, and both the safety cover and the dust collector (3) have the above-described predetermined relationship. What is joined is a safety cover with a dust removal fan having the dust removal device of the present invention, which is hereinafter referred to as an improved safety cover (1), and an embodiment will be described.

The improved safety cover (1) and the drive motor (1) are arranged so that the rotary shaft of the drive motor (10) having the handle (9) projects toward the back surface (6) of the improved safety cover (1). 10) and are joined. A gear (12) is installed at the tip of the rotary shaft (11) of the drive motor (10). The gear (13) (1
4) is distributed and these are meshed. The gear (13) is a gear attached to the tip of the drive shaft (8) of the dust collection fan (7), and the gear (14) is one end of the joint shaft (16) for inputting rotational force to the cutter blade (15). It will be the gear to be installed in. A bevel gear (17) is installed on the other end of the joint shaft (16), and the joint shaft (18) is attached to the cutter blade fixed shaft (18) whose material axis direction is different from that of the joint shaft (16) by 90 degrees. 1
6) Transmit the driving force. Cutter blade fixed shaft (18)
A bevel gear (19) meshing with the bevel gear (17) is installed on one side, and a knife fixing flange (20) is installed on the other side to fasten the cutter blade (15).

An engine (2) having a handle (9) directed tangentially to the back surface (6) of the improved safety cover (1).
The improved safety cover (1) and the engine (21) are joined so that the engine rotating shaft (22) of 1) projects. The bevel gear (2
3) is installed to transmit the rotation output of the engine rotation shaft (22) to the drive shaft (24) whose material axis direction is different from that of the engine rotation shaft (22) by 90 degrees. drive·
The axis of the shaft (24) is installed so as to be parallel to the axis of the drive shaft (8) of the dust collecting fan (7) of the improved safety cover (1) in the same direction. The bevel gear (23) is provided at one end of the drive shaft (24).
A bevel gear (25) that meshes with, a pulley (26) in the middle, and a gear (27) at the other end. A belt (29) is wound around a pulley (26) provided in the middle of the drive shaft (24) and a pulley (28) provided at the tip of the drive shaft (8) of the dust collection fan (7). The gear (27) installed at the other end of the drive shaft (24) meshes with the gear (31) at one end of the joint shaft (30). The rotation of the joint shaft (30) is reduced due to the number of teeth of the gear (27) and the gear (31). Joint shaft (3
Bevel gear (32) is installed at the other end of (0) so that the axis of the material is 90 degrees from the joint shaft (30).
The driving force of the joint shaft (30) is transmitted to the cutter blade fixed shaft (18) having different degrees. A bevel gear (33) that meshes with the bevel gear (32) is installed on one side of the cutter blade fixing shaft (18), and a knife fixing flange (20) is provided on the other side to fasten the cutter blade (15). To do.

The dust inlet (4) of the dust collector (3) provided at the narrowest part of the dust passage (2) is provided on the back surface (6) holding both side surfaces (5) of the safety cover. By providing the holes, the direction of the flow of the dust that has flown into the dust passage (2) vigorously and the direction of the force to be sucked from the dust inlet (4) of the dust collector (3) are aligned. Therefore, highly efficient dust removal is possible. The drive shaft (8) of the dust removal fan (7) is oriented so as to project from the back surface (6) of the improved safety cover (1).
By disposing both the safety cover and the dust removing device (3) and joining them, the eccentric weight of the dust removing device (3) can be brought close to the center of gravity of the entire cutter device. Therefore, the unbalance moment can be improved as compared with the case where the dust removing device (3) is installed on the side surface of the safety cover. Drive shaft (24) and joint shaft (3
0) is partly overlapped and spliced together, and wrapped with a housing to form a cutter arm. This cutter arm can not only hold the improved safety cover (1), but also the cutter blade (1
The deceleration torque can be transmitted to 5). drive·
By partially overlapping and joining the shaft (24) and the joint shaft (30), not only can the reduction mechanism of the cutter blade (15) be built here, but also the joint shaft (30) can be a drive shaft. It is possible to bring the center of gravity of the entire cutter device closer than in (24). Since the drive shaft (24) is in the same direction and parallel to the axis of the drive shaft (8) of the dust removal fan (7) of the improved safety cover (1), the dust removal fan (7). The belt (29) is simply hung on the pulley (28) provided at the tip of the drive shaft (8) and the pulley (26) provided in the middle of the drive shaft (24), and the drive shaft ( It becomes possible to input the rotational force to 8).

When the cutting tool equipped with the improved safety cover (1) is an engine cutter, the exhaust pipe (34) of the engine cutter is connected to the dust outlet (3) of the dust collector (3).
It communicates with the dust pipe (36) installed in 5). By doing so, the exhaust gas can be discharged together with the dust.
At the point where the exhaust pipe (34) communicates with the dust pipe (36), it functions as a kind of jet nozzle,
Exhaust gas can be discharged without hindrance. Since a filter such as a filter is installed at the tip of the dust pipe (36), the exhaust gas is purified by this filter. Further, the exhaust gas is discharged while colliding with particles of dust, and as a result, a muffling effect of engine sound is generated.

[0010]

The improved safety cover can be installed on the electric motor with a handle or the engine with a handle with good weight balance. Since the dust removal efficiency can be reliably improved, the dust removal fan can be downsized, the energy consumed by the dust removal fan can be reduced as much as possible, and it is comparable to the case where the motor output is used only for driving the cutter blade. .

[Brief description of drawings]

FIG. 1 is a side view of a cutter device having a safety cover with a dust exhaust fan according to the present invention.

FIG. 2 is a plan view of a cutter device having a safety cover with a dust exhaust fan according to the present invention.

FIG. 3 is a side view of a cutter device having a safety cover with a dust exhaust fan according to the present invention.

FIG. 4 is a plan view of a cutter device having a safety cover with a dust exhaust fan according to the present invention.

[Explanation of symbols]

 1 Improved safety cover 2 Dust passage 3 Dust extractor 4 Dust inlet 5 Side face 6 Back face 7 Dust fan 8 Drive shaft 9 Handle 10 Drive motor 11 Rotating shaft 12 Gear 13 Gear 14 Gear 15 Cutter blade 16 Joint ・Shaft 17 Bevel gear 18 Cutter blade fixed shaft 19 Bevel gear 20 Blade fixing flange 21 Engine 22 Engine rotating shaft 23 Bevel gear 24 Drive shaft 25 Bevel gear 26 Pulley 27 Gear 28 Pulley 29 Belt 30 Joint shaft 31 Gear 32 Bevel gear 33 Bevel gear 34 Exhaust pipe 35 Dust outlet 36 Dust pipe

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[Procedure amendment]

[Submission date] January 29, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (4)

[Claims] 1. A safety cover that encloses and encloses only a part of the cutting edge of a circular blade, wherein an outer circumferential arc of the safety cover is an outer circumferential arc whose diameter gradually increases, and an inner side of the safety cover having the outer circumferential arc. The clearance between the blade and the blade of the circular blade is provided as a dust passage, and the dust inlet of the dust collector faces the narrowest part of the dust passage, and the dust collector is outside the safety cover. While applying to the side integrally,
Inside the safety cover, a partition wall formed with a slit that does not obstruct the rotation of the circular blade is used as a partition wall that also serves as a dam at the dust inlet, and as a wall surface of the dust passage up to the center of the circular blade. This safety cover is divided into a main body and a movable body to form a body segment structure in which a spring force is interposed so that the area that wraps around the circular blade can be elastically changed while being extended. In a safety cover having a double-wing storage type rounded end face having a dust discharging device, the edge line of which is a rounded end face, the safety cover is provided with a dust inlet of the dust discharging device provided in the narrowest part of the dust discharging passage. A safety cover with a dust-exhausting fan, characterized in that the drive shaft of the dust-exhausting fan of the dust-extracting device is arranged in a direction projecting from the spine surface while the both sides of the spine are held. 2. A dust pipe which serves as a dust path is connected to a dust outlet of a dust collector, and an exhaust pipe communication port of an internal combustion engine is installed in the middle of the dust pipe. Safety cover with dust removal fan having the dust removal device described. 3. The safety cover with a dust fan and the drive motor are joined together so that the rotary shaft of the drive motor having a handle projects toward the back surface of the safety cover with a dust fan according to claim 1. The gear installed at the tip of the rotary shaft of the drive motor is meshed with the gear installed at the tip of the drive shaft of the dust-exhaust fan and the gear installed at the tip of the joint shaft for inputting rotational force to the cutter blade. A cutter device having a safety cover with a dust removal fan. 4. The safety cover with the dust-exhaust fan and the engine so that the rotary shaft of the engine having the handle protrudes toward the tangential direction of the back surface of the safety cover with the dust-exhaust fan according to claim 2. And the rotation output of the rotary shaft of the engine is transmitted to the drive shaft in the orthogonal direction by using the bevel gear, and the axis line of the drive shaft and the drive shaft of the dust collecting fan of the safety cover with the dust collecting fan are connected. Installed so that they are in the same direction and in a parallel relationship with the axis, put a belt around the pulley installed in the middle of the drive shaft and the pulley installed at the tip of the drive shaft of the dust collecting fan, and attach the belt to the end of the drive shaft. A safety cover with a dust removal fan, characterized in that the gear to be installed meshes with the gear to be installed at the tip of the joint shaft that inputs the rotational force to the cutter blade. Cutter device with.