JPH0243681Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention consists of a handle with a back metal attached to the tip,
In a replaceable blade saw, the saw blade is attached to the handle, and the saw blade is configured to be detachable from the handle as needed. It is about improvement.

In the past, the majority of saws used to cut wood were so-called double-edged saws, but with the increasing use of new construction materials such as plywood and laminated wood, sharpening work has become necessary recently. Many saws with replaceable blades are now in use.

For replaceable blade saws that allow the saw blade to be replaced arbitrarily with respect to the handle, it is important that the saw blade can be attached and detached with a simple operation, and that the attached state is secure and that it can be used for long periods of time. The quality of a product is determined by its ability to withstand use.

By the way, as a means for engaging the saw blade with the handle in such a replaceable blade type saw, for example, as described in Utility Model Publication No. 26724 of 1982,
Attach a back metal into which the saw blade can be inserted into the tip of the handle, and form a support part on the inner wall of the back metal, and when installing the saw blade, insert the recess of the saw blade into the support part. There are devices that are configured to overlap, but this type of structure is simple and can be attached and detached extremely easily, and at the same time can withstand long-term use. On the other hand, as a result of the spacing between the insertion parts of the replacement saw blades in the back metal being configured to match the thickness of a specific saw blade, even if the shape of the latching recess is the same, Even if there is, there is the inconvenience that it cannot be used for saw blades with different thicknesses. In other words, the thickness of the saw blade normally varies depending on the length of the saw blade, but when the back plate has a conventional configuration, the thickness of the saw blade varies depending on the thickness of the saw blade. However, there is the inconvenience of having to prepare backs of different shapes.

This invention relates to an improvement of the back plate for engaging a replacement saw blade, and it forms a gap in the back plate into which the replacement blade is inserted, and also reduces the gap at a certain part of the back plate. By adopting a configuration in which a narrowed portion is formed, the above-mentioned problems found in conventional configurations are attempted to be solved.

The structure of the back plate in the replaceable blade saw according to the present invention will be explained based on the drawings.As shown in FIGS. 2 and a replacement saw blade 4 that is detachable from the back metal 3. The back metal 3, which serves as the attachment part for the replacement saw blade 4, is shown in FIGS. As shown in FIG. 6, it has a gap into which the replacement saw blade 4 can be inserted, and a narrowed portion C formed by narrowing the gap, and the replacement saw blade 4 is latched within the gap. It is formed of a metal plate having a support part 5 for the purpose of the saw blade, and a gap B at a position below the support part 5 that is large enough to insert the end part A of the saw blade 4. At the same time, the entire structure has been hardened. The hardening process for the entire back metal 3 is intended to maintain the shape of the narrowed portion C in the back metal over a long period of time, but it is not an essential requirement of this invention.

The above is a case in which the narrowed portion C of the back metal 3 is formed at the lower edge of the back metal 3, but as another example, as shown in FIG. Alternatively, in some cases, as shown in Fig. 8, it is possible to have a configuration in which it is formed on the front part of the back plate, and depending on the position where it is formed, it is possible to This makes it possible to vary the force used to hold 4.

The back plate 3 of the replaceable blade type saw in this invention has the above-mentioned configuration, but when attaching the replaceable blade 4 to the back plate part, as shown in FIG. , the gap B formed in the back plate 3
At the same time as inserting the saw blade into the saw blade, the recess 6 formed in the saw blade is placed over the support part 5 of the back metal, and then the entire saw blade is pushed upward. .

The structure of the back plate in the replaceable blade saw according to this invention has the above-mentioned structure and has the following effects.

In other words, in the case of a replaceable blade type saw, if a support part is formed inside the back plate and a recess formed in the saw replaceable blade is hooked to the support part, the replaceable blade can be attached and removed with a simple operation. It has the advantage that it can be used for a long period of time, and that its attachment condition is reliable and can withstand long-term use. However, the back plate according to this invention has a structure in which a narrowed part C is formed, which is set to be less than the thickness of the replacement saw blade. By making the shape and position of the latching recess 6 in the saw blades the same, it is convenient that saw blades with various thicknesses can be mounted, and at the same time,
When installed, the saw blade itself is sandwiched by the narrowed portion C, so the replacement saw blade 4 and handle 2
This has the advantage of making the state of engagement more reliable.

[Brief explanation of the drawing]

The attached drawings show one embodiment of this invention, in which Fig. 1 is a side view showing the entire replaceable blade type saw, Fig. 2 is a side view showing the state in which the handle and the replaceable blade are attached and detached, and Fig. Figure 3 is a perspective view showing the entire back plate, Figure 4 is a perspective view showing the state of engagement between the back plate and the saw replacement blade, and Figure 5
The figure is a perspective view showing the internal structure of the gap in the back metal, FIG. 6 is a bottom view showing the shape of the narrow part in the back metal, and FIGS. 7 and 8 are perspective views showing other embodiments of the narrow part. be. 1...Replaceable blade saw body, 2...Handle, 3...Back plate, 4...Replaceable saw blade, 5...Support part, 6...Recess, A...Replaceable saw blade tip, B... Gap part, C...
...Narrowing part.

Claims (1)

[Scope of utility model registration request] A back metal 3 is attached to the tip of the handle 2, and when attaching the replacement saw blade 4 to the handle 2, the recess 6 of the replacement blade 4 is placed over the support portion 5 formed inside the back metal 3. In the replaceable blade type saw having the above configuration, the entire length of the back metal 3 is set to a dimension that supports the near side base of the replaceable blade 4, and the lower gap in the back metal 3 where the support part 5 is located is set. B is set to a width that allows the base of the replacement saw blade 4 to be easily inserted and released, and the wide gap B is located in front of the support part 5 of the back metal 3 and at the back metal 3. Continue until it reaches the narrowed part C, which is set to be less than the thickness of the saw replacement blade 4 formed near the lower side or near the tip side of the back metal 3, and when the saw replacement blade 4 is latched to the back metal 3. Normally, the back of the replacement saw blade 4 is allowed to rotate freely until it reaches the narrowed portion C, but when the replacement saw blade is fully installed, Permanent constriction C
The structure of the back metal in a replaceable blade type saw is characterized in that the other inner wall surface portion of the back metal 3 is formed so as not to come into pressure contact with the side surface of the replaceable saw blade 4. .