JPS6217201Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a saw blade fixing mechanism for a jigsaw.

The mounting portion of a saw blade for a jigsaw to a jigsaw body is sold in the market in various shapes and sizes. Therefore, the method of attaching the saw blade to the jigsaw body and the dimensions of the attachment part also vary among jigsaw manufacturers. For this reason, even if a consumer wants to use a commercially available inexpensive saw blade, a high-performance saw blade, or an easily available saw blade, they must purchase a jigsaw body that matches the saw blade. There were other inconveniences.

An object of the present invention is to reduce the inconveniences of the prior art by making the saw blade attachment part of the jigsaw body capable of attaching two or more types of saw blades.

As mentioned above, there are many types of jigsaw saw blade attachment parts. However, the saw blades that occupy the majority of the market and are the mainstream are those shown in Figures 1 and 2.
As shown in the figure, if the saw blade attachment portion of the jigsaw body has a structure in which at least these two types of saw blades can be attached, the inconveniences of the prior art described above can be alleviated considerably. The present invention is based on the fact that the dimensions of the attachment parts of the saw blade 1 shown in FIG _{. 1} and the saw _{blade 2} shown in FIG. We focused on this and devised the saw blade attachment part of the jigsaw body.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

3 is a plunger that is driven by an electric motor or the like and reciprocates in its axial direction;
The lower end of the saw blade 1 has a mounting width B ₂ as shown in Fig. 1.
Saw blade mounting hole 4 corresponding to the corresponding saw blade mounting hole 4
A saw blade mounting hole 5 is provided which corresponds to the width B' of the mounting portion of the saw blade 2 shown in FIG. here
Depending on the dimensional relationship between B ₂ and B', holes 4 and 5 may not necessarily be concentric, but holes 4 and 5 may be provided eccentrically as shown in Figures 3, 5, and 6. Bye. Furthermore, a screw hole 7 into which a bolt 6 for fixing the saw blade 1 or 2 to the plunger 3 is screwed is provided at the lower end of the plunger 3, and inside the hole 4 there is provided an auxiliary screw hole 7 having a substantially semicircular cross section. The member 8 is installed so that its flat part 9 is perpendicular to the axis of the screw hole 7, and the flat part 9 of the auxiliary member 8 forms a part of the inner wall of the hole 4 as a flat surface parallel to the axis of the plunger 3. That's helpful.

To attach the saw blade 1 to the saw blade attachment part of the plunger 3 configured as described above, use the inner wall of the hole 4 as a guide for the attachment part width _B2 of the saw blade 1, and attach the saw blade 1 to the plunger 3. 3, insert the shoulder part 10 of the saw blade 1 into the stepped parts 11 of the holes 4 and 5, and then tighten the bolt 6.
The side surface of the saw blade 1 is pressed against the flat part 9 of the member 8 and fixed. In addition, when installing the saw blade 2, use the inner wall of the hole 5 as a guide for the mounting part width B' of the saw blade 2,
The upper end surface 12 of the saw blade 2 is brought into contact with the bottom 13 of the hole 5 and fixed with the bolt 6.

In the above explanation, the saw blade attachment part of the plunger 3 was constructed as one piece except for the member 8, but in consideration of manufacturing difficulty and economy, it may be constructed as a separate part as shown in FIG. The member 8 may also be constructed integrally. Also, the hole 5 does not necessarily have to be circular,
As shown in FIG. 8, a groove 14 connected to the hole 4 is provided, and the groove 1
The dimension D including 4 may correspond to the width B' of the attachment part of the saw blade 2.

According to the present invention, it is possible to mount and fix at least two types of saw blades with different shapes and dimensions of the mounting part,
As a result, there is the practical benefit of being able to use saw blades with different attachment parts depending on the convenience and preference of the consumer.

[Brief explanation of the drawing]

Figures 1 and 2 are plan views showing the saw blade mounting part, and Figure 3 shows the saw blade mounting part according to the present invention.
FIG. 4 is a partial sectional view showing the saw blade in FIG. 2 installed, FIG. 5 is a partial sectional view showing the saw blade in FIG. 6 is a sectional view taken along the - line in FIG. 3, FIG. 7 is a sectional view taken along the - line in FIG. 3, FIG. 8 is a sectional view showing another embodiment of the present invention, and FIG. 8th
FIG. 3 is a plan view of the figure seen from below. 3 is the plunger, 4 and 5 are the respective saw blade mounting holes,
6 is a bolt, and 7 is a screw hole.

Claims (1)

[Scope of utility model registration request] In a jigsaw for cutting various materials, a saw blade is attached to the lower end of a plunger that reciprocates in the axial direction. two large and small saw blade mounting holes, one of the inner walls of which are formed as a flat surface parallel to the axis of the plunger; and a screw hole formed at the lower end of the plunger and substantially perpendicular to the flat surface. and a bolt that is screwed into the screw hole so that it can move forward and backward.