JPH05403U - Electric circular saw - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the object to be cut is metal, the object to be cut does not bite into the front end of the movable cover and the front end of the movable cover is not scraped. By forming the movable cover with synthetic resin, it does not become plastically deformed and cannot become unrotatable when dropped. An electric circular saw provided with a movable cover 3 having a substantially U-shaped cross section that covers a peripheral edge of a portion of a rotary saw blade 1 that projects downward from a base 2. The movable cover 3 is made of synthetic resin. A metal reinforcing plate 4 is provided at the front end of the movable cover 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric circular saw for cutting (cutting) an object to be cut such as wood or metal by rotating a rotary saw blade. More specifically, it relates to an electric circular saw that projects downward from the base of the rotary saw blade. The present invention relates to a movable cover for covering a peripheral portion.

[0002]

[Prior Art]

 In an electric circular saw, a movable cover with a substantially U-shaped cross section is provided to cover the peripheral portion of the portion that protrudes downward from the base of a rotating saw blade that has conventionally been rotated, thereby improving safety. For example, it is known from Japanese Patent Publication No. 62-33041. In the above-mentioned conventional case, the movable cover is made of synthetic resin.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, since the movable cover is made of synthetic resin, when the rotary saw blade is rotated to cut (cut) a thin metal plate or the metal material has an edge. When cutting a certain object, there is a problem that the object to be cut bites into the front end of the synthetic resin movable cover, or the front end of the synthetic resin movable cover is scraped.

In addition, the movable cover of a circular saw that cuts metal is generally formed of sheet metal, and there is no problem as described above. However, if the cover is made of sheet metal when it is accidentally dropped during transportation, the cover is made of sheet metal. Since it is plastically deformed, and in particular it is recessed in the direction of the rotary saw blade, it may hit the rotary saw blade and become unrotatable. The present invention was devised in view of the above-mentioned problems of the conventional example, and its purpose is to make the above-mentioned matter whether the object to be cut by the rotary saw blade is both wood and metal. It is an object of the present invention to provide an electric circular saw that does not cause any problems and does not have a risk of becoming unrotatable.

[0005]

[Means for Solving the Problems]

 The electric circular saw according to the present invention is an electric circular saw provided with a movable cover 3 having a substantially U-shaped cross section that covers a peripheral portion of a portion of the rotary saw blade 1 protruding downward from the base 2, and the movable cover 3 is made of synthetic resin. The movable cover 3 is formed by providing a metallic reinforcing plate 4 on the front end portion of the movable cover 3. By adopting such a configuration, the problems of the conventional example described above are solved and the present invention is realized. It has achieved its purpose.

[0006]

[Action]

 In order to use the electric circular saw, the electric circular saw is moved forward while rotating the rotary saw blade 1 to cut the object to be cut by the portion of the rotary saw blade 1 protruding downward from the base 2. In this case, the front end of the movable cover 3 is pushed rearward by the object to be cut, so that the movable cover 3 moves and the object to be cut is cut. By providing the metal reinforcing plate 4 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. As a result, the object to be cut does not bite into the front end of the movable cover 3 and the front end of the movable cover 3 is not scraped. Further, since the movable cover 3 is made of synthetic resin, it is prevented from being plastically deformed when it is dropped, so that it does not become unrotatable.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. The electric circular saw has a handle portion 6 provided at the rear of the main body 5, and a battery 10 is detachably attached to the rear portion of the handle portion 6. A reinforcing piece 6a is provided below the handle portion 6 of the main body 5, and by providing the reinforcing piece 6a for reinforcement in this way, the handle portion 6 can be made thin and easy to grip. A motor 7 is projectingly provided on one side of the front part of the main body 5, and a rotary saw blade 1 which is rotated by the motor 7 is provided on the other side of the front part of the main body 5, and the other side of the front part of the main body 5 is further provided. A fixed cover 8 is provided on the rotary saw blade 1, and the upper half of the rotary saw blade 1 is covered with a fixed cover 8. A base 2 is attached to the front lower surface of the main body 5, and the rotary saw blade 1 The lower half of 1 projects downward from the long groove 9 of the base 2.

In FIG. 3, 28 is a switch operating unit, 29 is a switch, 30 is a switch lock button for locking the switch operating unit, and 31 is for transmitting the rotation of the motor 7 to the saw blade mounting shaft 11. It is a gearbox that stores the gears of. Here, the rotary saw blade 1 is attached to the saw blade attachment shaft 11 located at the center of the cylindrical portion 31a provided in the gear box 31. 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 the peripheral edge of the portion of the rotary saw blade 1 that projects downward from the base 2, and the movable cover 3 is integrally molded of synthetic resin. Here, in the embodiment of the attached drawings, the movable cover 3 has one side piece 3a having a substantially U-shaped cross section that is long and the other side piece 3b is short, and the longer side piece 3a is a rotary saw blade. The side piece 3b, which is shorter than the base 2 of the rotary saw blade 1, covers substantially the entire one side surface of the portion of the rotary saw blade 1 that protrudes below the base 2. It covers the side surface of the other side surface near the outer peripheral edge. The spring support portion 12 provided on the upper part of the movable cover 3 and the spring support portion 13 projecting from the main body 5 support both ends of a spring member 14 made of a tension spring, and the movable cover 3 has a rotary saw blade 1. The spring member 14 is in the unloaded state in the state shown in FIG. 2 which covers the peripheral portion of the portion projecting downward from the base 2. When the object to be cut hits the front end of the movable cover 3 during cutting and is cut by the rotary saw blade 1, the movable cover 3 turns clockwise in FIG. 8 against the spring material 14. As shown in FIG. 8, it enters into the fixed cover 8. A metallic 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. 7, the reinforcing plate 4 has a shape along the front end portion of the outer peripheral bottom surface of the movable cover 3 and the front end portions of both side surfaces of the movable cover 3. Here, the reinforcing plate 4 may have a shape along at least the front end portion of the outer peripheral bottom surface of the movable cover 3 and the front end portion of one side surface of the movable cover 3. Further, both side pieces 3a, 3b of the movable cover 3 having a substantially U-shaped cross section are long and cover substantially the entire side surfaces of both of the portions of the rotary saw blade 1 which project below the base 2. In this case, the movable cover 3 may be provided so as to extend over substantially the entire length of the front end of the outer peripheral bottom surface and the front ends of both side surfaces of the long side pieces 3a, 3b. A guide portion 15 formed by curling is provided on the bottom portion 4a of the metal reinforcing plate 4. To attach the metal reinforcing plate 4 to the synthetic resin movable cover 3, for example, as shown in FIG. 6, the metal reinforcing plate 4 is fitted to the front end portion of the synthetic resin movable cover 3 and The boss 16 provided on the No. 3 is fitted into the holes 17 provided on both side pieces 4b, 4c of the reinforcing plate 4 and fixed by heat sealing.

As shown in FIG. 5, a chip introducing rib 19 is provided in the front portion of the fixed cover 8, and a part of the rotary saw blade 1 is provided in a vertical groove 20 provided in the chip introducing rib 19. It is included. The front part of the fixed cover 8 partitioned by the chip introducing rib 19 serves as a chip introducing space 21. A duct 22 is provided on the upper side surface of the front portion of the fixed cover 8, the duct 22 and the chip introduction space 21 communicate with each other, and the discharge port 23 of the duct 22 is directed rearward. It is open.

A chip storage box 24 is detachably attached to the side surface of the body 5 where the fixed cover 8 is provided. When the chip storage box 24 is attached, it is mounted so that the front side surface of the chip storage box 24 and the side surface of the fixed cover 8 overlap each other. The storage box 24 is fitted into the inside of an opening provided on the upper portion of one side surface of the front part of the storage box 24, and the discharge port 23 opens rearward in the front part of the chip storage box 24. Various attachment / detachment attachment means can be adopted to attach the chip storage box 24 detachably, and the attachment / detachment box 24 is not particularly limited. At the rear end surface of the chip storage box 24, a lid 26 rotatably attached by a rotation support portion 25 is provided so as to be openable and closable. In addition, 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 transparent so that the amount of chips accumulated inside can be visually confirmed from the outside.

A transparent protective cover 33 is attached to the lower portion of the front portion of the fixed cover 8 so as to be vertically slidable. The lower portion of the protective cover 33 projects downward from the lower end of the front end portion of the fixed cover 8 when the metal workpiece 32 is cut, or when cutting scraps do not scatter outside. Thus, the lower end of the protective cover 33 is brought close to the base 2 to prevent the cutting waste from scattering from the cutting portion to the outside. In this case, since the protective cover 33 is transparent, it is possible to see the portion where the object 32 to be cut is cut by the rotary saw blade 1. Of course, when the cutting dust is not a problem even if it scatters outward from the lower portion of the lower end of the front end of the fixed cover 8, the protective cover 33 is moved upward and the rotary saw blade 1 is used to cut the object It is possible to carry out the cutting work while directly observing the cut part of 32.

In order to use the electric circular saw of the present invention, while holding the handle portion 6 by hand, the electric circular saw is moved forward while rotating the rotary saw blade 1 to rotate the rotary saw blade 1. The object 32 to be cut is cut by the portion protruding downward from the base 2. In this case, the front end of the movable cover 3 is pushed rearward by the object to be cut 32, so that the movable cover 3 moves against the spring material 14 and enters the fixed cover 8 as shown in FIG. In this state, the object to be cut is cut. In this case, since the metal reinforcing plate 4 is provided on 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 cut object 32. Therefore, even if the object to be cut 32 has an edge on a thin metal plate or a metal material, the object to be cut will bite into the front end portion of the movable cover 3, or the front end portion of the movable cover 3 will The movable cover 3 can rotate smoothly without being scraped. In this case, by providing the guide portion 15, the electric circular saw smoothly slides on the object to be cut 32 even if the object to be cut 32 such as a thin metal plate is connected and a return occurs in the direction of the base 2. Because it can be moved, it is designed so that work is done well and it does not cause fatigue. Of course, in the present invention, not only metal but also wood and various other objects can be cut.

The cutting scraps of the workpiece 32 cut by the saw blade 1 are introduced into the chip introduction space 21 formed inside the front part of the fixed cover 8 and communicated with the chip introduction space 21. Chips are introduced into the chip storage box 24 from the 22 discharge port 23. In this case, the chips are discharged from the upper part of the front part inside the chip storage box 24 toward the rear and accumulated in the chip storage box 24. When discarding the chips accumulated in the chip storage box 24, remove the chip storage box 24 from the main body 5, carry the chip storage box 24 to the dumping place, open the lid 26, and open the inside chips. To throw away.

Of course, according to the present invention, the chip storage box 24 can be used even when the chip storage box 24 is removed from the main body 5 when there is no problem in discharging and scattering the chips at a general work site. is there.

[0015]

[Effect of the device]

 According to the present invention, as described above, in the electric circular saw provided with the movable cover having a substantially U-shaped cross section for covering the peripheral portion of the portion protruding downward from the base of the rotary saw blade, the movable cover is made of synthetic resin. However, since a metal reinforcing plate is provided at the front end of this movable cover, the work to be cut hits the metal reinforcing plate at the front end of the movable cover during cutting. Even if the metal is metal, the object to be cut will not bite into the front end of the movable cover and the front end of the movable cover will not be scraped.If the movable cover is made of synthetic resin, it will fall. It does not undergo plastic deformation and does not fall into the inability to rotate.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a side view of the above.

FIG. 3 is a side view showing a state in which one side of a cover of the above main body is removed.

FIG. 4 is a perspective view showing a state in which the above chip storage box is removed.

FIG. 5 is a partially cutaway side view of the above.

FIG. 6 is a perspective view of a portion where a reinforcing plate is attached to the above movable cover.

FIG. 7 is a perspective view of the same reinforcing plate.

FIG. 8 is a side view showing a usage state of the above.

[Explanation of symbols]

 1 Rotating saw blade 2 Base 3 Movable cover 4 Reinforcing plate

Claims (1)

[Claims for utility model registration] 1. An electric circular saw provided with a movable cover having a substantially U-shaped cross section for covering a peripheral portion of a portion protruding downward from a base of a rotary saw blade. Formed by
An electric circular saw having a metal reinforcing plate at the front end of the movable cover.