JPH04122001U - replaceable blade saw - Google Patents

Abstract

(57) [Summary] [Purpose] To deform both side walls of a back metal so as to form an S-shaped gap when viewed from the side, and to stably and strongly hold a saw blade between the back metal. [Structure] In a replaceable blade saw configured such that a back metal 2 having a substantially U-shaped cross section is attached to the tip of a handle 1, and a saw blade 3 is detachably attached to the back metal 2, the back metal 2 In the longitudinal direction, it spans a predetermined length from the tip 2A toward the handle 1, and in the width direction, the opening 2B
and the U-shaped groove bottom 2C so that a substantially S-shaped insertion gap L is formed in side view.・2
b has been modified.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a replaceable blade saw, and more specifically, a back metal is attached to the tip of the handle, A replaceable blade saw configured such that the saw blade can be detachably attached to the back plate. Regarding improvements.

0002

[Conventional technology]

Conventionally, various types of replaceable blade saws having the above-mentioned configuration have been proposed, but for example, , disclosed in Japanese Utility Model Publication No. 1674/1983 is known. This conventional The technology is to form the back metal attached to the handle with a thin steel plate into a U-shaped cross section, and then sandwich the saw blade between this. The saw blade is constructed so that it can be held, and a locking part is provided at the base of the saw blade so that the recess at the base end of the saw blade can be held. It is configured to be locked. Therefore, when installing the saw blade, attach the saw blade to the U-shape of the back metal. Insert it into the groove of the mold, hook the recess at its base end to the locking part, and then rotate it upward. This is done to match the back payment.

0003

[Problem that the idea aims to solve]

In replaceable blade saws with the above configuration, saw blades of various lengths can be replaced, but The thickness of the blade varies depending on its length for strength reasons, so the U-shape of the back metal The mold grooves are also relatively wide so that various saw blades can be replaced. ing. As a result, the thin saw blade is used exclusively for the above-mentioned locking part and the bottom of the U-shaped groove of the back metal. Therefore, it will be supported. Even with this saw blade holding method, the saw blade required for sawing Although the saw blade performs well in terms of pushing and pulling action in the front and rear directions, The occurrence of wobbling in the direction perpendicular to the board surface cannot be stopped, resulting in unstable sawing operation. This caused the blade to spill. In order to solve these problems, the above-mentioned back payment There is an idea of holding the saw blade in place. For example, Jitsuhei 2-43681 As proposed in the publication, the opening of the U-shaped groove in the back plate, in other words Then, narrow the distance between the side edges of the U-shaped cutting edge of the back metal to less than the thickness of the saw blade, and then tighten the saw blade. When set on the back plate, the above locking part, the bottom of the U-shaped groove on the back plate, and the opening The idea is to maintain it stably by three parties.

0004 However, the locking part, the bottom of the U-shaped groove on the back plate, and the opening cannot be used for protection. This holding method is superior to the prior art in that it can hold the saw blade more stably. However, the following problems remain. First, narrow down the opening of the U-shaped back metal. In this case, the sides of the saw blade are clamped only by this opening, and this clamping position is There is a distance between the position and the abutting position at the bottom of the U-shaped groove, and it is held in this opening. This leaves a lateral wobble using the side of the saw blade as a fulcrum. Therefore, the saw blade insertion set The width between the opening of the back plate and the bottom of the U-shaped groove can be easily adjusted. Therefore, it is desired that the saw blade be held in a more stable state over a period of time. The second problem is This is due to the weak clamping force of the back metal. In other words, the clamping force of the saw blade of the back metal is applied to the U-shape of the back metal. Therefore, if a simple U-shaped aperture structure is adopted as shown in Fig. 6, the The flat plate-shaped side walls of the back metal have low rigidity and are soft, and cannot exert sufficient clamping force. As a result, the saw blade can be held in a strong and stable state by the back metal. There wasn't. This becomes more noticeable as the thickness of the saw blade becomes thinner.

[0005] The present invention was proposed in view of the above-mentioned conventional circumstances, and the saw blade was created using a back metal. The purpose is to provide a replaceable blade saw that provides a strong and stable gripping condition. Ru.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention employs the following means. That is, Figure 1 As shown in FIG. 5, a back metal 2 having a substantially U-shaped cross section is attached to the tip of the handle 1, and In a replaceable blade saw configured such that a saw blade 3 is detachably attached to a metal 2 , in the longitudinal direction of the back metal 2, a predetermined length from its tip 2A toward the handle 1. Also, in the width direction, from the opening 2B to the U-shaped groove bottom 2C. substantially S-shaped insertion in side view over a depth of at least approximately the middle position between The both side walls 2a and 2b of the back metal 2 are deformed so that the entrance gap L is formed. This means that measures have been taken to

[0007] The material of the back plate 2 of the above-mentioned replaceable blade saw may be a conventionally known steel plate, etc., and has at least elasticity. It is sufficient to have the following. Further, the shape of the back metal 2 is also shown in the examples described later. The present invention can also be applied to conventionally used shapes in addition to the shape of the present invention. In addition, in the present invention, the cross-sectional shape of both side walls 2a and 2b of the back metal 2 is corrugated. Further, the deformation of both side walls 2a and 2b of the back metal 2 has a large number of convexities. It may also be stamped into a shape.

[0008]

[Effect]

According to the above configuration, when the saw blade 3 is set on the back metal 2, the saw blade 3 is set on the back metal 2. It is possible to stably hold the material up to approximately the middle position in the width direction. Also, back money 2 Both side walls 2a and 2b are deformed so as to have a substantially S-shape when viewed from the side. Therefore, the strength of these side walls 2a and 2b is increased, and the rigidity is also increased. Stronger with a larger clamping force compared to the clamping force of the conventional flat U-shaped steel plate. It can be retained. Then, the deformation of both side walls 2a and 2b of the back metal 2 becomes corrugated. When the back plate 2 is in a flat plate, it can be easily pressed by pressing. It is something that can be implemented. In addition, the deformation of both side walls 2a and 2b of the back metal 2 has many convexities. Similarly, it can be done by a relatively simple mechanical process. The both side walls 2a and 2b can be deformed by using this method.

[0009]

【Example】

Hereinafter, embodiments of the replaceable blade saw of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the handle 1 has a back plate 2 made of steel plate with a substantially U-shaped cross section at its tip. A notch is formed for fitting and attaching. This allows the above The back metal 2 is attached to the handle 1 and fixed by appropriate means such as a pin. It becomes. In this embodiment, the saw blade 3 is detachably attached to the back plate 2. A hook 3A is formed at the base end of the back plate 2 so as to attach the hook 3A to the rear end of the back metal 2. The locking pin 4 is provided so as to cross a groove having a substantially U-shaped cross section on the base end side of the back metal 2. The hook 3A of the saw blade 3 can be engaged with this locking pin 4. In the longitudinal direction of the back metal 2, from the tip 2A to the handle 1, a predetermined length is formed. In addition, in the width direction, from the U-shaped opening 2B to the U-shaped groove bottom 2 In a side view, the opening 2B The spine is arranged such that a substantially S-shaped insertion gap L is formed without narrowing the width of the back. Both side walls 2a and 2b of the metal 2 are deformed into a corrugated plate shape.

0010 This S-shaped insertion interval is shown in Fig. 2, assuming that the interval between the openings 2B is amm. Then, with respect to the center line AB of the two side walls 2a and 2b of the opening 2B, b is formed on both sides. If unevenness with a height difference of mm is formed, the gap at the center will be substantially a-2b mm. In a replaceable blade saw with such a configuration, the procedure for installing the saw blade 3 described above is as follows. Insert the hook 3A side into the U-shaped groove 3A of the back metal 2, and attach the hook 3 to the locking pin 4. A, and then rotate the saw blade 3 upwards to pinch it between the both side walls 2a and 2b of the back metal 2. It is done in such a way that it lasts. At this time, there are many S-shaped sections on both side walls 2a and 2b. The gap a-2b is larger than the thickness of the saw blade 3 because it is held between the inner curved points and... It only needs to be slightly narrower; conversely, even if the unevenness width b is slightly narrower, the thin saw blade 3 can be held between them. . Moreover, the width of the groove 3A remains wide on the pin 4 side, so the saw blade 3 is thinner than the thick saw blade 3. Can accommodate various saw blades up to 3.

[0011] FIG. 3 is a perspective view of another embodiment of the present invention, in which the base is The back metal 2 has a structure that is cut diagonally toward the bottom of the end, and both side walls of this back metal 2 The corrugated plate-like deformation of 2a and 2b extends from the obliquely cut oblique side 2D to the proximal end ( Multiple parallel waveforms are formed over a predetermined length toward the handle 1 side) It is.

0012 Furthermore, FIG. 4 is a partially cutaway perspective view of still another embodiment, in which the back The gold side walls 2a and 2b are deformed by punching out convex shapes at three locations. this The convex punching creates a substantially S-shaped insertion gap L when viewed from the side. It will be done.

[0013]

[Effect of the idea]

According to the replaceable blade saw according to the present invention, even if the S-shaped unevenness is slight, it can be compared to the conventional saw. The saw blade can be gripped more stably and strongly, allowing smooth sawing operation. It is possible to prevent the blade from falling off due to the wobbling of the saw blade, and the locking pin is The width of the groove on the side remains wide, making it suitable for both thick and thin saw blades. There is.

[0014] In addition, if the back metal is punched out into a corrugated or convex shape, the above-mentioned effect can be obtained. It is possible to obtain a backing metal that performs by simple press processing, and it has a remarkable effect. Nevertheless, it has the advantage of being available at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of essential parts of an embodiment of the present invention.

FIG. 3 is a perspective view of main parts of another embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view of a back plate according to still another embodiment of the present invention.

FIG. 5 is a perspective view of a back plate of a conventional replaceable blade type saw.

[Explanation of symbols]

1 pattern 2 Back money 2A (back gold) tip 2B (back metal) opening 2C (back metal) groove bottom 2a/2b side wall 3 Saw blade 4 Locking pin L Insertion gap

Claims (3)

[Scope of utility model registration request] [Claim 1] A back plate with a substantially U-shaped cross section at the tip of the handle (1)
(2) and the saw blade (3) is detachably attached to the back metal (2), in the longitudinal direction of the back metal (2), It spans a predetermined length from the tip (2A) toward the handle (1), and in the width direction, at least approximately from the opening (2B) to the bottom of the U-shaped groove (2C). Both side walls (2a) and (2b) of the back plate (2) are deformed so that a substantially S-shaped insertion gap (L) is formed in side view over the depth of the intermediate position. Replaceable blade saw. 2. The replaceable blade type saw according to claim 1, wherein the both side walls (2a) and (2b) of the back metal (2) are deformed into a corrugated plate shape. 3. The replaceable blade saw according to claim 1, wherein the both side walls (2a) and (2b) of the back metal (2) are deformed by punching out a number of convex shapes.