JPH06278103A - Electric circular saw - Google Patents

Abstract

PURPOSE:To accrately send a circular saw in an advance direction and to efficiently collect a generated cut powder in a dust collecting case by utilizing the rotary centrifugal force of the circular saw by arranging a ratationally driven circular saw blade, a grip part and the dust collecting case on a straight line. CONSTITUTION:A grip part 11 is rearwardly extended from the upper part of the circular saw receiving part 10 provided to the leading end part of a housing 1 and a motor receiving part 12 is extended from the lower part of the receiving part 10 and the rear surface of an endless plate 13 connecting the rear end of the grip part 11 and the rear end of the motor receiving part 12 up and down becomes the mounting surface of a dust collecting case 4. Therefore, the motor 5 and the grip part 11 are provided within the rotary plane of the circular saw blade 3 received in the receiving part 10 to make it possible to take left-and-right balance and the circular saw blade 3 can be accurately sent in an advance direction and the cut powder generated by the circular saw blade 3 is collected in the dust collecting case 4 from the hollow cylindrical part 17 of the grip part 11 by utilizing the rotary centrifugal force of the circular saw blade 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electric circular saw.

[0002]

2. Description of the Related Art Various types of portable electric circular saws are provided, and a portable electric circular saw equipped with a dust collecting case for collecting chips generated by cutting with a circular saw blade is provided. However, in the conventional electric circular saw, in the case where the dust collecting case is arranged behind the circular saw blade, the grip part is arranged at a position laterally displaced from the circular saw blade, and the grip part is circular. In the case where the saw blade is arranged on the rotating surface, the dust collecting case is arranged at a position laterally displaced from the circular saw blade.

[0003]

In this case, in the former case, although the chips can be efficiently collected in the dust collection case by utilizing the centrifugal force of the circular saw blade, the grip portion is located laterally from the circular saw blade. It is difficult to cut the circular saw blade straight along the line to be cut of the work piece because it is located in the displaced position.In the latter case, the straight cutting along the line to be cut of the work piece is difficult. Although easy, it was not possible to efficiently feed the cutting chips into the dust collection case because the dust collection case was located at a position displaced laterally. Further, in the conventional electric circular saw, the dust collection case is an obstacle and it is difficult to see the cut line of the cut object during the cutting work.

The present invention has been made in view of the above points, and an object of the present invention is to efficiently collect chips and to straighten a cutting object along a cutting line. To provide an electric circular saw capable of easily performing various cutting.

[0005]

According to the present invention, however, a circular saw blade that is rotationally driven, a grip portion, and a dust collection case for collecting chips generated by cutting with the circular saw blade are provided with a circular saw blade. The blade is characterized in that it is arranged in a straight line on the rotating surface of the blade.

[0006]

According to the present invention, since the circular saw blade, the grip portion and the dust collecting case are arranged in a straight line, it is easy to grasp the grip portion and feed the electric circular saw in the cutting advancing direction. The chips can be collected in the dust collecting case efficiently by utilizing the centrifugal force of the rotation of the circular saw blade.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. This electric circular saw is, as shown in FIG. 1, formed to be slender as a whole, and its housing 1 has a tip portion. The circular saw blade housing portion 10 has a grip portion 11 extending rearward from an upper portion of the circular saw blade housing portion 10, and a motor housing portion 12 extending rearward from a lower portion of the circular saw blade housing portion 10 for gripping. The rear surface of the end plate portion 13 that vertically connects the rear end of the portion 11 and the rear end of the motor housing portion 12 is a mounting surface of the dust collection case 4. The circular saw blade 3 disposed in the circular saw blade storage portion 10 in which the auxiliary handle 6 is projected laterally from one side surface of the circular saw blade storage portion 10 has a lower portion of the base 2 attached to the lower surface of the circular saw blade storage portion 10. In addition to projecting downward, the downward projecting portion is covered by a movable cover 8 which is rotatably attached to the housing 10 and is rotationally biased by a spring in a direction projecting downward of the base 2.

The tip of the circular saw blade housing portion 10 of the housing 1 is formed by a transparent cover 14. The reason why the tip of the housing 1 is transparent is to enhance the visibility during the cutting operation of the cutting portion by the circular saw blade 3, and the tip of the housing 1 is tapered as is clear from FIG. , A black line 20 attached to the upper surface of the tip of the base 2
This is to improve the visibility of. It is preferable that the transparent cover 14 be as large as possible within the range where the storage space for the movable cover 8 and the drive mechanism for the circular saw blade 3 are avoided, in order to improve the visibility. The inner transparent cover 15 located inside the transparent cover 14 is attached to the base 2, and the gap between the lower surface of the housing 1 and the base 2 is adjusted to adjust the cutting depth of the circular saw blade 3. The internal transparent cover 15 prevents the circular saw blade 3 from being exposed from between the base 2 and the transparent cover 14 even when adjusted.

The portion of the circular saw blade housing 10 other than the portion covered with the transparent cover 14 is surrounded by an inner housing 16 arranged in the housing 1 as shown in FIG. A motor 5 and a rotation transmission mechanism, which will be described later, are protected from chips generated by cutting with 3. Further, as shown in FIG. 6, the upper portion of the inner housing 16 is a tubular portion 17 having a rear end penetrating the hollow grip portion 11 and opening at the end plate portion 13.

As described above, the grip portion 11 is hollow in which the tubular portion 17 of the inner housing 16 penetrates in the front-rear direction, the outer surface is covered with a rubber material, and the trigger switch 19 is provided on the lower surface on the front end side. It is arranged. The operation display panel 7 arranged in front of the grip 11 on the upper end surface of the housing 1 is for setting and displaying the motor rotation speed.

As shown in FIGS. 6 and 7, the motor 5 arranged in the motor housing portion 12 located below the grip portion 11 is housed so that its axial direction is the front-back direction, and its rotation. Is the bevel gear 5 attached to the output shaft.
1, and a bevel gear 52 that meshes with this bevel gear 51,
Then, it is transmitted to the toothed wheel 53 that rotates integrally with the bevel gear 52, and is further transmitted to the toothed wheel 55 provided on the rotating shaft 30 to which the circular saw blade 3 is fixed by the timing belt 54. Power transmission between the bevel gear 52 and the rotary shaft 30 may be performed by a chain, a plurality of gears, or a connecting rod instead of the timing belt 55. The power transmission mechanism between the motor 5 and the rotary shaft 30 may be performed. It doesn't matter what kind of. The rotation of the motor 5 may be transmitted to the vicinity of the rotary shaft 30 by a shaft and the axial direction may be changed by a bevel gear or the like near the rotary shaft 30.

Further, in the illustrated example, the power transmission is performed on one side of the circular saw blade 3, but a power transmission mechanism is arranged on each side of the circular saw blade 3 to apply a rotational force to both ends of the rotary shaft 30 at the same time. By transmitting the torque, the left-right weight balance is further improved, and the load applied to each member of the power transmission mechanism is reduced, so that the large torque can be easily transmitted. Further, in the illustrated example, the motor 5 is arranged so that the rotary shaft 30 of the circular saw blade 3 and the axial direction of the motor 5 are orthogonal to each other, but the axial direction of the motor 5 is parallel to the rotary shaft 30. The motor 5 may be arranged as described above.

The dust collecting case 4 made of a transparent material, which is detachably attached to the rear surface of the end plate portion 13, communicates with the circular saw blade accommodating portion 10 through the cylindrical portion 17 and is cut by the circular saw blade 3. Although it is for accommodating the powder, a concave groove 40 is provided at the lower portion in the center in the left-right direction and extends over the entire length in the front-rear direction. The groove 40 is formed in the end plate 1
In the illustrated example provided on the lower portion of the rear surface of the power cord 3, the power cord lead-out portion, which is formed as the power cord connector 80, is covered with the dust collection case 4 so that the lead-out portion can be protected by the dust collection case 4. It is provided for this purpose.

It should be noted that the dust collection case 4 is the end plate portion 1
The front side, which is the 3rd side, is opened almost all over because this allows the power cord connected to the power cord connector to be stored in the dust collection case 4 when not in use. Is. Further, the rear end surface of the dust collection case 4 is formed as a flat surface because this surface is used as a ground surface so that the electric circular saw can be stored in a standing state. By storing in this way, the storage space can be reduced. Also,
Since the rear end opening of the cylindrical portion 17 is set to have a shape and size into which the suction hose of the electric vacuum cleaner can be inserted, the electric vacuum cleaner can also suck chips.

As shown in FIG. 9, the auxiliary handle 6 mounted on the left side surface of the housing 10 has a tip end portion of a mounting shaft 61 inserted into the housing 10 when the attachment / detachment button 60 at the base thereof is pushed in. Locking holes 66 formed in the inner part of the mounting holes 65 formed in the housing 1 so as to project from the outer surface.
The engaging protrusion 62 that prevents the auxiliary handle 6 from coming off and prevents it from rotating by engaging with the spring 63 also resists the spring 63.
It is pushed into the inside, and as a result, the locking hole 66 and the locking projection 62
Since the engagement with and is released, the auxiliary handle 6 can be removed. Further, since the housing 1 is also provided with the mounting hole 65 having the locking hole 66 on the right side surface thereof, the auxiliary handle 6 can be mounted on the right side. 68 in FIG.
Is a cover that normally closes the mounting hole 65 on the right side,
The auxiliary handle 6 is attached to the right side by removing the cover 68, and the removed cover 68 is used to close the attachment hole 65 on the left side.

The attachment of the auxiliary handle 6 is carried out by the engaging projection 6
Since the tip end side of 2 has an inclined edge, it can be carried out only by inserting the mounting shaft 61 into the mounting hole 65 and can be detached only by pushing the detachable button 60 and pulling it out as described above. 6 can be attached to and detached from the housing 1 with one touch. The mounting structure of the auxiliary handle 6 to the housing 1 is not limited to the above structure,
It is preferable to connect and disconnect with one touch.

In this electric circular saw, however, the motor 5 which is a heavy object is located behind the circular saw blade 3 and the grip portion 11 is located above the motor 5, so that the circular saw blade 3
Since there is the motor 5 and the grip portion 11 in the rotation surface of the, and the left and right weights are balanced, the grip portion 11
It is easy to hold when holding and holds the circular saw blade 3 so that the line to be cut of the non-cutting object and the circular saw blade 3 can be easily matched when the circular saw blade 3 is applied to the object to be cut, and the motor 5 is rotated. Even when the cutting is actually performed, the center of gravity is in the rotation surface of the circular saw blade 3 and the grip portion 11 is also in this rotation surface. Therefore, the electric circular saw is straightened along the cutting line. It can be sent easily. The tip of the housing 1 is tapered and this part is transparent cover 1
Since it is formed of No. 4, it is possible to easily further cut along the cutting line.

Further, since it is symmetrical except for the auxiliary handle 6, not only right-handed persons but also left-handed persons can use it without any problem, and there is no difference in usability. Even when the auxiliary handle 6 is used, the left and right can be changed by one touch as described above. Therefore, even when the auxiliary handle 6 is used, the left-handed person is not disadvantaged and the left-handed person and the left-handed person are not disadvantageous. Usability does not deteriorate even when the person alternately uses the person. Since the power cord is also pulled out to the rear, the power cord does not get in the way.

The chips generated during the cutting are centrifugally generated by the rotation of the circular saw blade 3 and are caused by the cylindrical portion 1 of the inner housing 16.
7 and is sent into the dust collection case 4 through the inside of the grip portion 11, and the chips are efficiently collected. In particular, since the inside of the grip portion 11 is used as a chip passage, it is possible to dispose the grip portion 11 within the rotation surface of the circular saw blade 3 without bending the passage for sending the chips to the dust collection case 4. At the same time, it is possible to prevent the arrangement of the grip portion 11 and the deterioration of the efficiency of feeding the cutting chips into the dust collection case 4 that occurs when the passage of the cutting chips is bent. Further, since the dust collection case 4 is on the rear end side of the housing 1, the presence of the dust collection case 4 does not make it difficult to see the cut line of the cut object.

A dust collecting case 4 is provided at the upper part of the rear end of the housing 1.
If a battery block is attached to the lower part of the rear end, it is possible to obtain the same usability even with a battery power source.

[0021]

As described above, in the present invention, since the circular saw blade, the grip portion, and the dust collecting case are arranged in a straight line, the grip portion is gripped to feed the electric circular saw in the cutting advancing direction. It is easy to make a straight cut along the line to be cut of the object to be cut, and the chips are collected in the dust collection case by utilizing the centrifugal force of the rotation of the circular saw blade. It can be done efficiently.

Moreover, in the case where the grip part is empty and the inside of the grip part is a chip passage for connecting the upper space of the accommodating part of the circular saw blade with the dust collecting case, the cutting path for sending the chip to the dust collecting case is used. In addition to making it possible to collect chips in the dust passage more efficiently in the dust passage, the arrangement of the dust passage will not restrict the arrangement of the grip part. The tip of the housing that houses the motor is used as a circular saw blade housing, the grip is located above the motor housing, and is formed integrally with the housing, the dust collection case is attached to and detached from the rear end surface of the housing. If it is flexible, it can have a cohesive design, and at the same time, it has a good left-right balance and is even easier to use.

When the power cord is pulled out from the rear end surface of the housing and the dust collecting case surrounds the power cord pulling portion, the dust collecting case also functions as a member for protecting the pulling portion of the power cord.

[Brief description of drawings]

FIG. 1 shows an embodiment, and FIGS. 1A and 1B are perspective views.

FIG. 2 is a side view of the above.

FIG. 3 is a plan view of the above.

FIG. 4 is a front view of the above.

FIG. 5 is a rear view of the above.

FIG. 6 is a schematic vertical sectional view of the above.

FIG. 7 is a schematic horizontal sectional view of the above.

FIG. 8 is a schematic transverse sectional view of the above.

FIG. 9 is an exploded sectional view showing the auxiliary handle mounting structure of the same.

[Explanation of symbols]

 1 Housing 3 Circular Saw Blade 4 Dust Collection Case 5 Motor 10 Circular Saw Blade Storage Section 11 Grip Section 12 Motor Storage Section

Claims (8)

[Claims] 1. A circular saw blade that is rotationally driven, a grip portion, and a dust collection case for collecting chips generated by cutting with the circular saw blade are arranged in a straight line in a rotation surface of the circular saw blade. An electric circular saw characterized by being placed in. 2. The grip portion is hollow, and the inside of the grip portion is a chip passage that communicates the upper space of the accommodating portion of the circular saw blade with the dust collection case. The described electric circular saw. 3. A housing for accommodating a circular saw blade motor has a tip portion as an accommodating portion for the circular saw blade, and a grip portion is located above the motor accommodating portion and is integrally formed with the housing, The electric circular saw according to claim 2, wherein the dust collection case is detachably attached to a rear end surface of the housing. 4. The electric circular saw according to claim 3, wherein the power cord is pulled out from the rear end surface of the housing, and the dust collection case surrounds the power cord pulling portion. 5. The electric circular saw according to claim 4, wherein the power cord lead-out portion is formed as a connector which can freely connect and disconnect the power cord. 6. The electric circular saw according to claim 2, wherein a suction hose of the electric vacuum cleaner is connectable to a discharge port of the dust collecting path in the grip, the discharge port opening toward the dust collecting case. 7. The electric circular saw according to claim 3, wherein a rear end surface of the dust collecting case is formed into a flat surface, and the flat surface is placed on a horizontal surface so that the dust collecting case can stand upright. 8. The electric circular saw according to claim 3, wherein the power cord is freely housed in the dust collection case.