JP3098801B2 - Electric circular saw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric circular saw for cutting an object to be cut such as wood or metal by rotating a rotary saw blade, and more particularly, to storing a cut (cut) chip. It is related to the structure of the case.

[0002]

2. Description of the Related Art At present, in electric circular saws, wood, metal pipe, plastic, A
Various materials such as LC (foam concrete) can be cut (cut). And of course, to cut such various materials, the chips (chips)
Are similarly varied. At a general work site, there is no problem even if the chips are discharged outside, but when used in a store or home remodeling or remodeling, the discharge of the chips will pollute the surroundings, which is a problem. In interior work), it is necessary to cover the room with a sheet or the like so as not to contaminate the room with dust. From such a point, a dust collecting type circular saw has appeared so as to remove chips as little as possible.

[0003]

However, in the above-mentioned dust collecting type circular saw, the chip storage box is fixed integrally with the main body, and when the chips stored in the chip storage box are to be discarded, a dumping place is disposed together with the main body. There is a problem that the work has to be troublesome because the user has to carry it away and throw it away. Further, there is also a problem that the chip storage box is rather obstructed in places where there is no problem even if the chips are discharged to the outside as in a general work site, so that it is often difficult to perform the work.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to be able to remove and use a chip storage box at a general work site and to use it safely. Also, in places where chips should not be discharged to the outside, a chip storage box can be attached so that chips can not be discharged to the outside, and furthermore, when discarding the chips stored in the chip storage box, separate them from the main body. The main purpose is to provide an electric circular saw that can be easily carried to the dumping point and dumped, and at the same time, the chip can be smoothly introduced into the chip storage box, and the chip storage box can be stably attached and detached. It can be mounted freely, improves the storage of chips in the chip storage box, and protects the workers from air discharged from the air outlet. As to, and further can be easily discharged chips from the chip accommodating Bossuku, furthermore of stored chips in the chip receiving box is intended to be able to see by eye.

[0005]

In order to solve the above-mentioned conventional problems and achieve the object of the present invention, an electric circular saw according to the present invention comprises:
An elongated handle 6 which can be grasped by hand from the rear of the main body 5 provided with the rotary saw blade 1 on one side extends rearward, and the battery 1 protrudes from both sides of the handle 6 at the rear of the handle 6.
0 is a long circular saw in the front-rear direction, and is located at the rear of the handle 6 from the side of the fixed cover 8 that covers the rotary saw blade 1 on one side of the main body 5 along the side of the handle 6. And handle part 6
The long chip storage box 24 in the longitudinal direction to reach the side surface of the battery unit 10 detachably disposed, fixed cover 8 and the battery before and after both ends of the longitudinal direction longer chip storage box 24 projecting from the side It is characterized by being supported by being engaged with the portion 10 . Further, a guide duct 22 for feeding chips into the chip storage box 24 may be provided at an outlet of the fixed cover 8.

Further, an air discharge port 27 may be provided at the upper corner of the chip storage box 24 at the rear end opposite to the main body 5 so as to extend over the side surface and the upper surface.

Further, a lid 26 that can be opened and closed may be provided on the rear end face of the chip storage box 24. Furthermore, the chip storage box 24 may be made transparent.

[0008]

The rotary saw blade 1 is rotated to cut the workpiece. A fixed cover 8 is provided on the electric circular saw so as to cover substantially the upper half of the rotary saw blade 1. Since the detachable chip storage box 24 is disposed, the chip storage box 24 is removed at a general work site so that work can be performed without being obstructed by the chip storage box 24. In this case, since the rotary saw blade 1 is covered with the fixed cover 8, even if the chip storage box 24 is removed, the rotary saw blade 1 can be covered to ensure safety.
On the other hand, a chip storage box 24 is attached to a place where chips should not be discharged to the outside so that chips are not discharged to the outside. Since the chip storage box 24 is detachable, when the chips stored in the chip storage box 24 are discarded, the chips are separated from the main body 5 and only the chip storage box 24 is carried to the dumping place to discard the chips. . In addition, a handle is provided at the rear of the body 5 of the electric circular saw.
Section 6 and a battery section 10 behind the handle section 6
The rotary saw blade 1 is provided on the main body 5 and the rotary saw blade 1
The fixed cover 8 that covers the
When the end is engaged with the fixed cover 8 and the other end is engaged with the battery unit 10,
Make sure that both ends of the chip storage box 24 are supported
As a result, it can be stably mounted. like this
If the chip storage box 24 is attached to the
Can be used so that it is not discharged to the
The waste storage box 24 can be separated from the main body 5 and easily dumped.
And safely remove the chip storage box 24
Can be used, and both ends of the chip storage box 24
Stable because it is supported by the fixed cover 8 and the battery unit 10
Will be installed.

Further, when a guide duct 22 for feeding chips into the chip storage box 24 is provided at an outlet of the fixed cover 8, the guide duct 22 is provided from inside the fixed cover 8 to the side of the fixed cover via the guide duct 22. Chips can be smoothly introduced into the arranged chip storage box 24 .

When an air outlet 27 is provided in the upper corner of the rear end of the chip storage box 24 opposite to the main body 5 so as to extend over the side surface and the upper surface, the chip storage box 24 is provided.
The chips introduced and stored in the chip are stored in the chip storage box 24.
It is stored from the lower part of the rear part inside, but air can be exhausted from a position away from the storage location of this chip,
It is possible to improve the storability of the chips in the chip storage box 24, prevent the chips from leaking from the air outlet 27, and prevent the air discharged from the air outlet 27 from hitting the worker.

Further, if a lid 26 that can be opened and closed is provided on the rear end face of the chip storage box 24, the chips can be easily discarded, and the lid 26 is located on the operator side, so that the workability is improved. is there.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments shown in the accompanying drawings. The electric circular saw is configured such that a handle 6 is provided at a rear portion of the main body 5 and a battery unit 10 is detachably attached to a rear portion of the handle 6. A reinforcing piece 6a is provided below the handle 6 of the main body 5.
The handle 6 is made thin and easy to grip by providing and reinforcing the reinforcing piece 6a in this manner. In addition, by reinforcing with the reinforcing piece 6a, it is not damaged even if it is dropped unexpectedly, and the reinforcing piece 6a is located between the hand holding the handle 6 and the work 32 to protect the hand. It has become. A motor 7 protrudes from one side of the front part of the main body 5, and a rotary saw blade 1 rotated by the motor 7 is provided on the other side of the front part of the main body 5. A fixed cover 8 is provided on the rotary saw blade 1, and a substantially upper half of the rotary saw blade 1 is covered by the fixed cover 8, and a base 2 is attached to the front lower surface side of the main body 5. Substantially protrudes downward from the long groove 9 of the base 2.

In FIG. 6, reference numeral 28 denotes a switch operating unit, 29 denotes a switch, 30 denotes a switch lock button for locking the switch operating unit, and 31 denotes a switch for transmitting the rotation of the motor 7 to the saw blade mounting shaft 11. It is a gear box that houses gears. Here, the rotary saw blade 1 is a gear box 3
1 is attached to the saw blade attachment shaft 11 located at the center of the cylindrical portion 31a provided in the first embodiment. The movable cover 3 is rotatably attached to the cylindrical portion 31a provided on the gear box 31 described above. The movable cover 3 has a substantially U-shaped cross section so as to cover a peripheral portion of a portion protruding downward from the base 2 of the rotary saw blade 1, and the movable cover 3 is integrally formed of synthetic resin. Here, the movable cover 3 is one side piece 3a of the movable cover 3 having a substantially U-shaped cross section in the embodiment of the accompanying drawings.
Is longer, the other side piece 3b is shorter, and the longer side piece 3b
“a” covers substantially the entire surface of one side of a portion of the rotary saw blade 1 projecting below the base 2, and the shorter side piece 3 b projects below the base 2 of the rotary saw blade 1. The side surface of the portion near the outer peripheral end of the other side surface of the portion is covered. Both ends of a spring member 14 composed of a tension spring are supported by a spring support portion 12 provided above the movable cover 3 and a spring support portion 13 projecting from the main body 5.
3 covers the periphery of the portion of the rotary saw blade 1 protruding downward from the base 2, the spring member 14 is in a no-load state. The object to be cut is moved by the movable cover 3 during cutting.
When the rotary saw blade 1 cuts the movable cover 3 against the spring member 14, the movable cover 3 rotates clockwise in FIG. 14 and enters the fixed cover 8 as shown in FIG. It is going to go. A metal reinforcing plate 4 is provided at the front end of the movable cover 3 having a substantially U-shaped cross section. In the embodiment shown in FIG. 11, the reinforcing plate 4 has a shape along the front end of the outer peripheral bottom surface of the movable cover 3 and the front end of both sides of the movable cover 3. Here, the reinforcing plate 4 may have a shape along at least the front end of the outer peripheral bottom surface of the movable cover 3 and the front end of one side surface of the movable cover 3.
Also, both side pieces 3a, 3b of the movable cover 3 having a substantially U-shaped cross section.
Are long enough to cover substantially the entire surfaces of both sides of the portion protruding below the base 2 of the rotary saw blade 1, the front end of the outer peripheral bottom surface of the movable cover 3 and the long sides The pieces 3a, 3b may be provided so as to extend over substantially the entire length of the front ends of both side faces. A guide portion 15 formed by curling is provided on the bottom 4a of the metal reinforcing plate 4. The metal reinforcing plate 4 is replaced with the synthetic resin movable cover 3.
For example, as shown in FIG. 10, a metal reinforcing plate 4 is fitted on the front end of a synthetic resin movable cover 3 and bosses 16 provided on the movable cover 3 are attached to both side pieces 4b of the reinforcing plate 4, as shown in FIG.
The hole 17 provided in 4c is fitted and fixed by heat sealing.

As shown in FIG. 8, a chip introducing rib 19 is provided at a front portion in the fixed cover 8, and a part of the rotary saw blade 1 is inserted into a vertical groove 20 provided in the chip introducing rib 19. Is in. The front part in the fixed cover 8 partitioned by the chip introduction rib 19 forms a chip introduction space 21. A duct 22 is provided on an upper side surface of a front part of the fixed cover 8, and the duct 22 communicates with the chip introduction space 21, and a discharge port 23 of the duct 22 opens rearward. Is what it is. By providing the chip introducing ribs 19 in the fixed cover 8 as described above, the chips are prevented from being guided by the rotation of the rotary saw blade 1, moving backward and scattering, and can be reliably discharged to the duct 22 side. I have to.

A chip storage box 24 as shown in FIG. 9 is detachably attached to the side of the main body 5 on which the fixed cover 8 is provided. In this case, the chip storage box 24 is mounted so as to overlap with the side surface of the front part of the chip storage box 24 so that the side surface of the fixed cover 8 overlaps. The edge of the opening 24a provided at the upper part is locked to a locking hook 22a projecting forward just in front of the duct 22 provided at the upper front end of the side surface of the fixed cover 8, and the chip storage box 24 An elastic engagement hook 24b protruding from the rear portion of the side surface of the main body 5 is detachably engaged with an engagement groove portion 10a provided in the battery portion 10 attached to the rear end portion of the handle portion 6 at the rear portion of the main body 5. It is installed by doing. Of course, the chip storage box 24 may be removably mounted by other mounting means. When the chip storage box 24 is supported and mounted at the front and rear ends in this manner, the chip storage box 24 that is long in the front-rear direction can be stably supported at both ends, and the mounting is stable, and unexpected movement due to movement during work and vibration due to cutting. In addition, by mounting near the opening 24 into which the duct 22 is fitted, a gap is not formed between the fixed cover 8 and the chip, and the chips do not leak outside from this portion. I can do it. When the chip storage box 24 is mounted on the side surface of the fixed cover 8 as described above, the duct 22 protruding from the fixed cover 8 extends from the opening 24 of the chip storage box 24 to the front of the chip storage box 24. The discharge port 23 of the chip storage box 24 opens rearward at the front of the chip storage box 24. The chip storage box 24 is long back and forth,
As described above, the chip storage box 24 is mounted on the side surface of the fixed cover 8 so as to overlap with the base 2 and is mounted above the base 2 in close proximity to the base 2. It is a part 24c. The notch 24c is formed in the opening 24 into which the duct 22 is fitted.
Is provided at a position corresponding to the lower part of. By providing a notch 24c on the lower surface of the front end of the chip storage box 24, the cut portion of the workpiece 2 by the rotary saw blade 1 can be easily seen even when the chip storage box 24 is mounted. Accurate cutting can be done.
Further, as shown in FIG. 9, the chip storage box 24 is formed so as to be longer in the front-rear direction and wider as going backward, and the width of the chip storage box 24 is narrow at a side portion of the rotary saw blade 1. It is becoming. For this reason, in the portion of the rotary saw blade 1, the protrusion to the side can be reduced, so that the chip storage box 24 can be prevented from obstructing the cutting operation as much as possible, so that comfortable work can be performed. In addition, by reducing the protrusion to the side at the portion of the rotary saw blade 1 as described above, the front view is good and accurate cutting work can be performed. On the rear end face of the chip storage box 24, a lid 26 rotatably mounted by a rotation support portion 25 is provided to be openable and closable. Further, an air outlet 27 is provided at an upper corner of the chip storage box 24 at the rear end opposite to the main body 5 so as to extend from the side surface to the upper surface. As described above, when the air discharge port 27 is provided so as to extend to the side surface and the upper surface at the upper corner opposite to the main body 5 at the rear end of the chip storage box 24, the air is introduced into and stored in the chip storage box 24. Chips are sequentially stored from the lower rear portion of the chip storage box 24, but air can be discharged from a position distant from the chip storage location, so that the chips can be stored in the chip storage box 24. And the chips do not leak from the air outlet 27.
Exhausted air along with the fine chips does not hit the worker, so that the worker can work comfortably. The chip storage box 24 is transparent so that the amount of chips stored inside can be visually checked from the outside.

A transparent protective cover 33 is attached to the lower part of the front of the fixed cover 8 so as to be slidable in the vertical direction. And, when cutting the metal workpiece 32, or when it is not necessary for cutting waste to scatter outside,
The lower portion of the protective cover 33 is lowered so as to protrude downward from the lower end of the front end portion of the fixed cover 8 to bring the lower end of the protective cover 33 close to the base 2 so as to prevent cutting chips from scattering outside. ing. In this case, since the protective cover 33 is transparent, it is possible to see a portion where the workpiece 32 is cut by the rotary saw blade 1. Of course, if it does not matter much if the cutting chips fly outward from the lower part of the lower end of the front end of the fixed cover 8, the protective cover 33 is moved upward as shown in FIGS. The workpiece 3 by the rotary saw blade 1
The cutting work can be performed while directly checking the portion where the cutting 2 is cut with the eyes.

In the present invention, as shown in FIG. 5, the motor 7 is disposed on one side of the handle 6 and the chip storage box 24 is disposed on the other side, so that the weight in the left-right direction is increased. The balance is good, and the work can be easily performed when working with the handle portion 6, and the rotary saw blade 1 and the workpiece 32 are positioned at a right angle at the time of cutting, so that accurate cutting can be performed.

Also, as shown in FIG.
By arranging the battery unit 10 behind the motor 7 and the rear, the weight balance in the front-rear direction with the handle part 6 at the center is improved, and the work can be performed easily and the user does not get tired. In order to use the electric circular saw of the present invention, the rotary saw blade 1 is used.
Moving the electric circular saw forward while rotating
The object to be cut 32 is cut at a portion projecting downward from the base 2. In this case, when the front end of the movable cover 3 is pushed rearward by the workpiece 32, the movable cover 3 moves against the spring material 14 and enters the fixed cover 8 as shown in FIG. Cutting of the workpiece is performed in this state. In this case, since the metal reinforcing plate 4 is provided at the front end of the movable cover 3 made of synthetic resin, the metal reinforcing plate 4 at the front end of the movable cover 3 hits the front end of the workpiece 32. For this reason, even if the object to be cut 32 has an edge in a thin metal plate or a metal material, the object to be cut into the front end of the movable cover 3 or the front end of the movable cover 3 is cut off. The movable cover 3 can be smoothly rotated without performing. In this case, by providing the guide portion 15, the electric circular saw can smoothly slide on the workpiece 32 even when the workpiece 32 such as a metal thin plate is connected and a return occurs in the base 2 direction. Because it can move, the workability is good and it doesn't get tired. Of course, in the present invention, not only metal but also wood and other various things can be cut.

[0019] Here, places where it is troublesome to discharge chips and contaminate the surroundings, such as remodeling and remodeling of stores and houses,
In the case of indoor work, a chip storage box 24 is attached and used so as not to be stained with chips as shown in FIG. In this case, the workpiece 3 cut by the saw blade 1
The chip 2 is introduced into the chip introduction space 21 formed inside the front part of the fixed cover 8 and guided by the chip introduction rib 19 to communicate with the chip introduction space 21 while preventing scattering. Chip storage box 2 from discharge port 23 of duct 22
Chips are introduced into the inside 4. In this case, the chips are discharged backward from the upper portion of the front in the chip storage box 24 and are stored in the chip storage box 24. Exhaust gas is supplied to the body 5 at the rear end of the chip storage box 24.
The air is discharged from an air discharge port 27 provided at the upper corner opposite to the side so as to extend over the side surface and the upper surface so as not to hit the operator. When the chips stored in the chip storage box 24 are to be discarded, the chip storage box 24 is detached from the main body 5, the chip storage box 24 is transported to the dumping place, the lid 26 is opened, and the chip is discarded. It is.

Of course, in the present invention, when there is no problem even if chips are discharged and scattered in a general work site, the chip storage box 24 is used with the chip storage box 24 removed from the main body 5 as shown in FIG. I do. In this case, even if the chip storage box 24 is removed, the upper half of the rotary saw blade 1 is covered with the fixed cover 8, so that there is no problem in terms of safety. The space for introduction 21
A duct 22 is provided on the upper side surface of the front part of the fixed cover 8, the duct 22 communicates with the chip introduction space 21, and a discharge port 23 is formed rearward in the duct 22,
By taking out the chips from the side of the worker holding the handle portion 6 rearward, the chips are prevented from directly hitting the worker.

FIG. 15 shows an embodiment in which the electric circular saw is provided with a water injection means. That is, the water injection tank 50 is attached to the motor 7 with the band 51, and water is injected from the water injection tank 50 to the cutting edge of the rotary saw blade 1 via the hose 52. Here, a water injection amount adjusting valve 53 is provided in the middle of the hose 52 so that the water injection amount can be adjusted. The water injection amount adjusting valve 53 is attached to the mounting plate 54.
The mounting plate 54 is firmly mounted on the main body 5 with screws 55, so that the water injection amount adjusting valve 53 does not rattle or move, so that the operability is improved and the adjustment can be performed correctly. It is.

[0022]

According to the present invention, as described above, a handle is provided at the rear of the main body of the electric circular saw, a battery is provided at the rear of the handle, and a rotary saw blade is provided at the main body. A fixed cover that covers the rotary saw blade is provided, a detachable chip storage box is arranged on the side surface of the handle, and both front and rear ends of the chip storage box are supported by engaging with the fixed cover and the battery unit . At a general work site, the chip storage box can be used by removing it, and even if the chip storage box is removed, the rotating cover is covered by the fixed cover and it can be used safely. In places where it is not possible, a chip storage box can be attached to prevent the chips from being discharged to the outside.Furthermore, when the chips stored in the chip storage box are discarded, they are separated from the main body and easily held at the dump location. Nde be dumped, also an opposite end portions of the chip storage box stable Toritsukeraru things are to be supported respectively. Thus, in the present invention, when the chip storage box is attached, it can be used so that the chips are not discharged to the outside, and when discarding the chips, the chip storage box can be separated from the main body and easily dumped, Also,
The chip storage box can be safely used even if it is removed, and both ends of the chip storage box are
Because it is supported by the battery unit , it can be attached stably
It is . In addition, an elongated handle portion which can be grasped by hand from the rear portion of the main body provided with a rotary saw blade on one side extends rearward, and a battery protruding from both sides of the handle portion at the rear portion of the handle portion.
The electric circular saw having a long front-rear direction provided with a portion, and located at a rear portion of the handle portion from a side of a fixed cover covering a rotary saw blade on one side of the main body along a side portion of the handle portion. Since the chip storage box long in the front-rear direction is detachably arranged so as to reach the side surface of the battery unit protruding from the side, the length of the chip storage box is set to the side of the fixing cover of the main body located at the front part of the handle. From the front to the side of the battery unit provided at the rear of the handle, and the front and rear ends of a chip storage box long in the front-rear direction are fixed with the cover and the battery.
Since the support is engaged with the part, will be attached to support the long chip storage box back and forth in the battery portion projecting from both sides of the fixed cover and the handle portion to cover the rotary saw blade on one side of the main body, the handle portion A detachable long chip storage box in the front-rear direction can be stably supported at both ends thereof, and can be easily attached and detached without a large force.

In the electric circular saw, a fixed cover is provided so as to cover substantially the upper half of the rotary saw blade, and a detachable chip storage box is disposed on a side surface of the fixed cover.
Chips can be smoothly introduced from inside the fixed cover into a chip storage box arranged on the side of the fixed cover via a guide duct .

In the case where an air discharge port is provided at the upper corner of the chip storage box at the rear end opposite to the main body so as to extend to the side surface and the upper surface, the chip is introduced and stored in the chip storage box. Chips are stored from the lower rear part of the chip storage box, but air can be exhausted from a position distant from the chip storage location, thereby improving chip storage in the chip storage box. At the same time, chips are prevented from leaking from the air discharge port, and a worker can be prevented from hitting the air discharged from the air discharge port, so that comfortable work can be performed.

Further, if a lid that can be opened and closed is provided on the rear end face of the chip storage box, chips can be easily discarded,
In addition, since the lid is on the worker side, the workability is improved. In the case where the chip storage box is made transparent, the storage amount of the chips can be visually confirmed, and the timing of discarding the chips can be easily determined.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention as viewed from one side.

FIG. 2 is a perspective view of the same as seen from the other side.

FIG. 3 is a side view of the same.

FIG. 4 is another side view of the same.

FIG. 5 is a plan view of the same.

FIG. 6 is a side view of the same main body with one side of a cover removed.

FIG. 7 is a perspective view showing a state where the chip storage box is removed from the same.

FIG. 8 is a partially broken side view of the same.

FIG. 9 is a view showing the chip storage box according to the first embodiment;
Is a side view, and (b) is a plan view.

FIG. 10 is a perspective view of a portion where a reinforcing plate is attached to the movable cover of the above.

FIG. 11 is a perspective view of a reinforcing plate of the above.

FIG. 12 is a side view showing a state where the transparent cover is lifted up with the above-mentioned chip storage cover attached.

FIG. 13 is a side view showing a state in which the transparent cover is lifted up in a state where the chip storage cover is not attached.

FIG. 14 is a side view showing a state in which the workpiece is being cut.

FIG. 15 is a perspective view of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating saw blade 5 Main body 6 Handle part 8 Fixed cover 10 Battery part 22 Duct 24 Chip storage box 26 Lid 27 Air outlet

Continued on the front page (56) References JP-A-63-7218 (JP, A) JP-A-60-48403 (JP, U) JP-A-61-106322 (JP, U) JP-A-3-11518 (JP) , U) Japanese Utility Model Showa 62-144604 (JP, U) Japanese Utility Model Showa 58-166406 (JP, U) Japanese Utility Model Showa 58-166405 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) B27B 9/00 B23D 47/00 B27G 3/00

Claims (5)

(57) [Claims] 1. A battery having an elongated handle portion extending rearward from a rear portion of a main body provided with a rotary saw blade on one side and extending from the both sides of the handle portion to a rear portion of the handle portion.
The electric circular saw having a long front-rear direction provided with a portion, and located at a rear portion of the handle portion from a side of a fixed cover covering a rotary saw blade on one side of the main body along a side portion of the handle portion. long chips storage box in the longitudinal direction to reach the side surface of the battery protruding from the sides and detachably disposed, the front and rear ends of the longitudinal direction longer chip storage box fixed cover and the electrostatic <br/> Ikebe An electric circular saw characterized by being supported by being engaged with a circular saw. 2. The electric circular saw according to claim 1, wherein a guide duct for feeding chips into the chip storage box is provided at an outlet of the fixed cover. 3. The electric circular saw according to claim 1, wherein an air discharge port is provided at an upper corner of the chip storage box at the rear end opposite to the main body so as to extend over the side surface and the upper surface. . 4. The electric circular saw according to claim 1, wherein a lid that can be opened and closed is provided at a rear end portion of the chip storage box. 5. The electric circular saw according to claim 1, wherein the chip storage box is made transparent.