JPH058005Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a portable electric saw used, for example, in plumbing work for water supply and drainage.

(Prior Art) In a portable electric saw equipped with a saw blade that is moved forward and backward by an electric motor, a slide shaft is used to convert the rotation of the electric motor into reciprocating motion and transmit it to the saw blade. , for example, JP-A-61
As shown in Publication No. 44525, the conventional slide shaft was formed with a rectangular cross section as a whole to prevent the saw blade from rattling around its axis, so the slide shaft could be moved freely inside the casing. It is not easy to support the saw blade, and the sealing of the bearing part is incomplete, resulting in bearing oil flowing down toward the saw blade during use.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, supports the saw blade without rattling, and allows the slide shaft to be easily installed inside the casing. It was completed with the aim of being a portable electric saw that could not only do this, but also completely seal the bearings.

(Means for Solving the Problems) The present invention provides a portable electric saw in which a slide shaft having a saw blade attachment section at the tip and a guide section at the rear end is attached to the inside of the casing so that it can move forward and backward. It is characterized in that the cross section of the attachment part to the casing is circular, and the cross section near the guide part at the rear thereof is square.

(Embodiment) Next, the present invention will be explained in detail with reference to the illustrated embodiment. 1 is a casing, 2 is a motor built in the rear part of the casing, 3 is a slide shaft provided in the casing 1, and 4 is a saw blade. be. The slide shaft 3 has a saw blade attachment part 5 at its tip, and has a circular cross section at the center and a square cross section at the rear.This circular cross section is fitted into a bush 6 at the front of the casing 1. By inserting it, it is attached to the casing 1 so that it can move forward and backward and swing freely. Note that 7 is a seal provided at the bush 6, and since the slide shaft 3 has a circular cross section, there is an advantage that the seal can be reliably sealed. Further, a guide portion 8 having an inverted U-shaped cross section is provided on the lower surface of the rear end of the slide shaft 3 in a direction perpendicular to the axis thereof. As shown in FIG. 3, the upper part of the guide part 8 is a vertical surface 9, and the guide groove member 1 is formed on the lower surface of the upper part of the casing 1.
0 to prevent rotation of the slide shaft 3 about its axis.

On the other hand, a shaft 12 supported by a bearing 11 is provided in the casing 1 on the lower side of the slide shaft 3 so as to be perpendicular to the central axis of the slide shaft 3, and a gear 13 is rotatably mounted on this shaft 12. installed. This gear 13 has its upper surface pressed downward by the upper and lower surfaces of the casing 1 via a thrust bearing 14 to prevent floating, and teeth 15 on its lower surface mesh with a pinion 16 attached to the output shaft of the motor 2. It is designed to be rotated by rotating it. A pin 17 is press-fitted into the gear 13 at a position offset by 1/2 of the stroke of the saw blade 4, and at the upper end of this pin 17 there is a roller that is slidably fitted into the guide portion 8 of the slide shaft 3. 18 is installed. Furthermore, in the illustrated embodiment, a pin 19 that can slide in a direction parallel to the central axis of the gear 13 is provided inside the hollow pin 17, and the upper end of the pin 19 is engaged with the guide portion 8. be.

An inclined plate 21 is attached to the lower surface of this gear 13 by bolts 20. As shown in FIG. 3, the inclined plate 21 is inclined laterally, and a slide bearing 22 is provided on the upper surface thereof.
The lower end 23 of the pin 19 is in contact with the upper surface of the thrust bearing 22. This contact force is applied to the ball spring 24 on the upper and lower surface of the casing 1.
This is achieved by pressing the entire slide shaft 3 downward. As a result, when the gear 13 rotates, the roller 18 presses the guide part 8 in the front and back direction to move the slide shaft 3 forward and backward, and the pin 19 is moved up and down by the inclined plate 21 via the slide bearing 22, so that the slide shaft 3 This will cause it to swing up and down. Note that 25 is a horizontal convex member fixed to the tip of the slide shaft 3, and 26 is a saw blade holding plate combined therewith.

(Function) With this configuration, if the saw blade 4 is attached to the saw blade attachment part 5 at the tip of the slide shaft 3 and the motor 2 is driven to rotate the gear 13, the A roller 18 attached to the upper end of the pin 17 rotates while sliding within the guide portion 8 of the slide shaft 3 to move the slide shaft 3 forward and backward, allowing the saw blade 4 to perform cutting. In the present invention, as mentioned above, since the cross section of the attachment part of the slide shaft 3 to the casing 1 is circular, the slide shaft 3 can be easily supported by the bushing 6 etc. so as to be able to freely move forward and backward. Since the cross section is circular, reliable sealing can be achieved by the seal 7. Therefore, in the present invention, the life of the attachment portion of the slide shaft 3 to the casing 1 is extended, and there is no risk of bearing oil leaking out during use. Moreover, in the present invention, since the cross section of the rear portion of the slide shaft 3 near the guide portion 8 is square, the slide shaft 3 does not rotate within a vertical plane, which prevents the saw blade 4 from wobbling. Nor.

In the illustrated embodiment, as the gear 13 rotates, the pin 19, which is slidably provided in the pin 17, has its lower end 23 pushed up periodically by the inclined plate 21 provided on the lower surface of the gear 13. The slide shaft 3 is raised and lowered by being moved forward, the rear part of the slide shaft 3 is pulled down when the slide shaft 3 moves forward, and the rear part of the slide shaft 3 is pushed up when the slide shaft 3 retreats. This allows the saw blade 4
is lifted when moving forward and pushed down when moving backward, allowing efficient sawing.

(Effect of the invention) As is clear from the above explanation, the present invention supports the saw blade without wobbling by making the section where the slide shaft is attached to the casing circular in cross section and the rear part square. In addition, it facilitates attachment to the casing and allows complete sealing. Therefore, the present invention has extremely great practical value as a portable electric saw that eliminates the problems of the conventional saw.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a partially cutaway front view showing an enlarged main part, Fig. 3 is a sectional view thereof, and Fig. 4 is a perspective view of the slide shaft. It is a diagram. 1...Casing, 3...Slide shaft,
5... Saw blade attachment part, 8... Guide part.

Claims (1)

[Scope of utility model registration request] A cross section of the attachment part of the slide shaft 3 to the casing 1 in a portable electric saw in which a slide shaft 3 having a saw blade attachment part 5 at the tip and a guide part 8 at the rear end is attached to the interior of the casing 1 so as to be able to move forward and backward. A portable electric saw characterized in that the section is circular, and the cross section near the guide member 8 at the rear thereof is square.