JPS6235362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a portable electric circular saw, and particularly to a circular saw powered by a battery and capable of adjusting the cutting depth.

[Background technology]

In order to be able to change the depth of cut, the entire circular saw body placed on the base can be moved relative to the base that rests on the workpiece. As shown in FIG. 1, the configuration is such that a circular saw body 2 is rotatably connected to the front edge of a base 1 via a shaft 4, and the circular saw body 2 is fixed to the rear of the base 1 at an arbitrary angle. The cutting depth can be adjusted by loosening the mounting part 5, rotating the circular saw body 2 around the shaft 4, and tightening the mounting part 5. However, in the past, as shown in FIG. 1, the handle 3 was placed at a position behind the shaft 4 in the cutting direction, which was offset from the line l connecting the shaft 4 and the mounting part 5 in the plane. When performing cutting work by applying a force F to the handle 3, the force F' that presses the circular saw body 2 against the base 1, which is the vertical component of this force F, and the force point A where this force F is applied and the above The moment expressed by the product of the distance m between the line l and the distance m acts, and the circular saw body 2 is twisted relative to the base 1 that rests on the upper surface of the workpiece 10.
As a result, the point B of the base 1 in the figure rises above the workpiece 10, resulting in a problem that stable cutting cannot be performed.

As shown in Japanese Unexamined Patent Publication No. 57-207002, a mounting part that is rotatably connected and two mounting parts that can be fixed at any angle are both placed on the extension of the rotating surface of the saw blade. If the handle is also located on the extension of the rotating surface, the handle will be located on the line connecting both mounting parts, so the component of the force applied to the handle will be However, in a circular saw, the handle is placed on the outer periphery of the saw blade, which has the largest outer diameter, through the saw blade cover. This results in the problem that the handle is separated from the center of gravity of the circular saw, making it difficult to use.

[Purpose of the invention]

The present invention was developed in view of the above, and its purpose is to adjust the depth of cut by rotating the circular saw body relative to the base and changing the connection angle between the base and the circular saw body. To provide a circular saw which can perform cutting work without twisting a circular saw body with respect to a base and is easy to use.

[Disclosure of the invention]

Therefore, the present invention provides a circular saw body that is provided with a battery power source and a motor and is disposed above a base, and a first attachment part that rotatably connects the circular saw body to the base, and an arbitrary connection. A circular saw that is attached to the base with a second attachment part that fixes the circular saw body to the base at an angle and has a variable protrusion amount of the saw blade that protrudes from the bottom surface of the base, wherein at least one attachment part is attached to the base so that the saw blade rotates. The first mounting part and the second mounting part are arranged at positions shifted from each other in the axial direction of the saw blade, and the first mounting part and the second mounting part The circular saw body can be twisted relative to the base by providing the handle on the line connecting the first mounting part and the second mounting part in the plane. The present invention is designed to prevent such a moment from occurring, and at the same time, to allow the handle to be placed at a position different from the rotating surface of the saw blade in the axial direction.

The present invention will be described in detail based on the illustrated embodiments shown in FIG. This is a circular saw main body, and a circular saw main body 2 is rotatably connected by a shaft 4 to a support portion 11 which is erected from one side of the front edge of a base 1. The mounting part 5 for fixing the circular saw body 2 to the base 1 at an arbitrary angle is an adjustment spring having a long hole 23 erected from the rear end of the base 1, as shown in detail in FIGS. 7 and 8. 22
and a square root screw 24 provided at the rear end of the fixed cover 15 which is on one side of the circular saw body 2 and covers the saw blade 8, and a wing nut 25 screwed into the square root screw 24 which is inserted into this elongated hole 23. The circular saw body 2 can be fixed to the base 1 at any angle by tightening a wing nut 25.

The motor 6 is housed from the center of the front part of the circular saw body 2 to one side, and the battery 7 is housed in a housing recess 8 formed at the rear of the motor 6. motor 6
As shown in FIG. 5, a gear 26 is attached to the output shaft of the motor 6, and the motor 6 drives the drive shaft 12 via a reduction gear 28, which is arranged in a gear box 27 which is also used to fix the motor 6. ing. 30 is a movable safety cover, 31 is a flange for mounting the saw blade 9, and 32 is a spring for returning the movable safety cover 30.

The storage recess 8 for storing the battery 7 has an open outer surface, and as shown in FIGS. 11 to 13, the battery contact terminal 18 is located at the upper part of the back, the spring 29 is located at the upper part of the center, and the recess 8 has an open outer surface. A spring 19 is arranged at the bottom,
Furthermore, a baffle plate 21 is suspended above the opening edge. As shown in FIGS. 14 and 15, the spring 19 is attached to the shaft 20 in such a way that the upward spring biasing force is increased by a protrusion 36 that moves by operating a lock lever 35 exposed on the outer surface of the circular saw body 2. The battery 7 with the battery terminal 17 is housed in the storage recess 8 from the side, and the battery 7 is pushed up by the spring 19 by operating the lock lever 35, thereby removing the battery terminal. 17 is the battery contact terminal 18
The battery 7 is prevented from coming off by the baffle plate 21. Battery 7 is stored in recess 8
This is to ensure that the storage recess 8 is securely fixed therein, and also to prevent damage to the storage recess 8 due to the presence of the spring 19 and the spring 29, which is weaker than the spring 19, even if an impact is applied. Furthermore, as is clear from FIG. 10, the lid fitting 40 attached to the opening of the storage recess 8 is fitted with a shaft 41 provided on the circular saw body 2 and a bearing portion 42 formed in a bifurcated shape on the lid fitting 40. By providing a hook 43 that engages with a protrusion 44 on the outer surface of the recess 8, assembly can be easily performed.
1 and the bearing part 42, the hook 43 and the protrusion 4
The engagement force is made to decrease in the order of 4, so that when a shock such as when dropped is applied, the hook 43 comes off, the bearing part 42 comes off, and the lid metal fitting 4
This prevents the shaft 41 from being deformed or the shaft 41 from breaking.

Now, the handle 3 provided on the circular saw body 2 is equipped with a switch 45 and a switch lever 46, and is arranged so as to straddle both the motor 6 storage area and the battery 7 storage area, and a fixed cover 15. The handle 3 is provided at a position close to the handle 3 so that the handle 3 is located on a line l connecting the shaft 4 and the mounting portion 5 in a plane. In other words, the force point A on which the force F applied to the handle 3 during cutting is located on this line l, and therefore the distance m between the force point A and the line l is 0 and relative to the base 1. A moment that would twist the circular saw body 2 is not generated, and the corners of the base 1 are not lifted off the workpiece 10, allowing stable cutting work. Furthermore, although the mounting portion 5 is arranged on an extension of the rotating surface of the saw blade 9, the shaft 4 is provided at a position shifted in the axial direction, so the handle 3 is also arranged in the axial direction from the rotating surface of the saw blade 9. Because it can be installed at an offset position and closer to the center of gravity of the circular saw,
It is also easy to use. However, if the depth of cut is adjusted by rotating the circular saw body 2 around the shaft 4, the point of effort A will be on the line l.
However, as shown in Figure 6, when the depth of cut is set to the shallowest, it is most susceptible to the influence of the moment, so at this time, the point of force A and line l are completely aligned. It is preferable to keep it consistent with .

〔Effect of the invention〕

In the present invention, as described above, the force applied to the handle during cutting does not cause a moment that would cause the circular saw body to twist relative to the base, and the base is lifted off the workpiece. This allows for stable cutting even when the depth of cut is shallow, and since the handle is not on the extension of the rotating surface of the saw blade, it is placed close to the center of gravity. It is easy to use as it can be equipped with a handle.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the conventional example, Fig. 2 is a perspective view of an embodiment of the present invention, Fig. 3 is a plan view of the same, Fig. 4 is a rear view of the same, and Fig. 5 is a cutaway front view of the same. , 6th
The figure is a side view of the same as above, FIG. 7 is a view taken along the X arrow in FIG. 6, FIG. 8 is a sectional view taken along the Y-Y line in FIG. 7, and FIG. A sectional view, FIG. 10 is a perspective view of the lid fitting, FIGS. 11 to 13 are sectional views of the battery storage section, FIG. 14 is a broken perspective view of the same, and FIG. 15 is a sectional view of the same, 1 is a base, 2 is a circular saw body, 3 is a handle, 4 is a shaft as a first attachment part, 5 is a second attachment part, 6 is a motor, 7 is a battery, 8 is a storage recess, 17 is a battery terminal, 18 is a battery contact terminal, 19
21 indicates a baffle plate.

Claims (1)

[Scope of Claims] 1. A circular saw body equipped with a battery power supply and a motor and disposed above a base, and a first attachment portion rotatably connecting the circular saw body to the base; A circular saw that is attached to the base with a second attachment part that fixes the circular saw body to the base at a connection angle and has a variable protrusion amount of the saw blade that protrudes from the bottom surface of the base, wherein at least one attachment part is attached to the base. The first mounting part and the second mounting part are installed at a position apart from the rotating surface in the axial direction of the saw blade, and the first mounting part and the second mounting part are arranged at positions shifted in the axial direction of the saw blade. A circular saw characterized in that a handle is provided on a line connecting the two on the plane. 2. The circular saw according to claim 1, wherein the handle is formed astride the motor storage section and the battery storage section in the circular saw body. 3. The battery storage part is formed as a recess with a battery contact terminal arranged therein, and is equipped with a spring that biases the battery in a direction that is substantially perpendicular to the battery insertion/removal direction and presses the battery terminal toward the battery contact terminal. 2. The circular saw according to claim 1, further comprising a baffle plate on the mouth edge of the loading/unloading opening in the biasing direction.