JPH03227601A - Blade changing type hand saw - Google Patents

Abstract

PURPOSE:To constitute the title saw so that a change of a saw blade is performed easily and looseness between the saw blade and a handle main body can be prevented, by a method wherein the handle main body contains the detachable saw blade, an auxiliary core is laid into a part of the handle main body besides its front part, the saw blade is formed into a shape so that the saw blade is fitted into the auxiliary saw blade and a connecting hole and a screw fitting in both the saw blade and handle main body with each other are formed respectively on the saw blade and handle main body. CONSTITUTION:An outer shell 9 is constituted of the quality of the material having elasticity and an auxiliary core 10 having an appropriate length is laid into the outer shell, in a handle main body 3. When an insertion part 6 of a saw blade 2 is inserted into an insertion hole 12 up to the interior, a rear end fitting protrusion 7 is fitted into a fitting recessed part formed in the tip of an auxiliary core. Under this state, the first set hole 8 formed in the insertion part 6 is confronted with the second set hole 14 formed in the outer shell 9 and a screw shaft 16 of a setscrew 15 is screwed into the second set hole and first set hole 8. Since the saw is constituted like this, a change of the saw blade is easy and the main body 3 and saw body 2 are set firmly at a fixed position.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a replaceable blade type hand saw whose saw blade can be replaced.

<Prior Art> As a prior art that is interesting to the present invention, there is a manual handle described in Japanese Utility Model Application Publication No. 149780/1983, which was filed by the applicant of the present application. The handle of this manual tool has a blade part and a handle part integrally formed, and rubber plates in the shape of two halves of the handle are attached to both left and right sides of the handle part.

Further, as another prior application, there is a manual disclosed in Japanese Utility Model Application No. 61-25103. On the hand side, the proximal end of the saw blade is extended obliquely downward to form a handle integrally with the saw blade, and a saw handle cover is attached to the handle.

<Problems to be Solved by the Invention> Among the conventional techniques, the former has a rubber plate attached to the handle, so it is necessary to peel the rubber plate from the handle and attach the rubber plate to another handle. Not intended for reuse. For this reason, even if a tooth breaks and the saw blade needs to be replaced, it is not possible to remove just the rubber plate and reuse it.

Among the conventional techniques, the latter also does not have a replaceable saw blade, and the saw handle cover is removed from the saw blade and used by attaching the saw handle cover to another saw blade. It's not meant to be.

On the other hand, in recent years, so-called replaceable blade type saws have become mainstream, and the saw blade can be replaced when the sharpness deteriorates due to tooth loss or the like.

This invention is suitable for such replaceable blade type saws, and has a hand handle that is non-slip and easy to handle, and the handle part can be easily removed from the saw blade when replacing the saw blade. This invention allows the handle part to be easily attached to the replaced saw blade, and the hand pull side that does not cause wobbling between the handle and the saw blade after installation. Including possible sawing,
An auxiliary core of an appropriate length is embedded in the handle body except for the front part, and a concave or convex part is formed at the tip of the auxiliary core. An insertion hole is formed into which the rear part of the body can be inserted,
The rear end of the saw blade is formed with a convex part or a concave part that can fit into the concave part or convex part formed at the tip of the auxiliary lead, so that the rear part of the saw blade can be inserted all the way into the insertion hole of the handle body. The rear end of the saw blade and the tip of the auxiliary lead engage with each other when the saw blade is turned, and a first locking hole is formed in the rear part of the saw blade, and a first locking hole is formed in the rear part of the saw blade. A second locking hole is formed at a position opposite to the first locking hole when the rear part of the saw blade is fully inserted into the insertion hole. This is a replaceable blade type manual side characterized by being provided with a locking screw communicating with the locking hole.

Further, it is preferable that a female thread is cut on the inner circumferential surface of the first locking hole, and the female thread is adapted to be screwed into a locking screw.

According to this invention, when replacing the saw blade, the saw blade inserted into the insertion hole in the front part of the saw blade is removed, the saw blade is replaced with a new one, and the saw blade is replaced with a new saw blade. The saw body can be easily replaced by simply inserting the rear part of the saw body into the insertion hole.

When the rear part of the saw blade is inserted all the way into the insertion hole, the convex or concave part at the rear end of the saw blade and the concave or convex part at the tip of the auxiliary core engage with each other, so that the saw blade can handle the handle. Does not rattle against the main body.

When fixing the saw blade and the handle body, if a female thread is formed in the first locking hole of the saw blade and the locking screw is screwed into the female thread of the first locking hole, the nut can be secured. is no longer needed,
In addition, the saw body, locking screw, and handle body can be integrated.

<Embodiments> Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an exploded perspective view of a replaceable blade type guide side 1 according to an embodiment of the present invention. Further, FIG. 2 is a side view of this replaceable blade type manual side 1, and the handle portion is shown in a sectional view so that its internal structure can be seen. Furthermore, Figure 3 shows that
FIG. 2 is a plan sectional view taken along the line ■-■ in FIG. 2;

Referring to FIGS. 1 to 3, the replaceable blade type guide side 1 includes a saw body 2 and a handle body 3 that are replaceable.

The saw body 2 includes a blade portion 5 in which a large number of teeth 4 are arranged in a row, and a blade portion 5.
It consists of an insertion section 6 that is integrally provided at the rear of the.

The rear end of the insertion portion 6 is an engaging convex portion 7 projecting in the shape of a “<” character, and a first fixing hole 8 is formed in the insertion portion 6.

The handle body 3 has an outer shell 9 made of an elastic material, for example synthetic rubber in this embodiment, and an auxiliary core 10 of an appropriate length is embedded in the synthetic rubber outer shell 9. There is. The auxiliary core] 0 is made of a strong hard material, for example, an aluminum alloy in this embodiment. The auxiliary core 10 is embedded in the handle body 3 except for the front part, and the distal end of the auxiliary core 10 has an engaging convex portion 7 formed on the insertion portion 6 of the saw body 2 described above.
An engagement recess 11 recessed in the shape of a "<" character is formed to engage with.

Furthermore, the handle body 3 in which the auxiliary core 10 is not embedded
An insertion hole 12 into which the insertion portion 6 of the saw blade can be inserted is formed in the front part of the synthetic rubber outer shell 9. The insertion hole 12 is a vertically elongated slit-like hole when viewed from the insertion direction and has a width that is approximately equal to the thickness of the insertion portion 6. Since the insertion hole 12 is formed of the synthetic rubber outer shell 9 as described above, it expands and contracts to some extent when inserting the insertion portion 6, making it a hole that is relatively easy to insert even though it is thin.

When the insertion part 6 is inserted all the way into the insertion hole 12, as shown in FIG. It is received in the mating recess and the two are firmly engaged.

Furthermore, a recess 13 for receiving the head of a set screw 15 to be described later is formed on one side of the front part of the synthetic rubber outer shell 9 in which the insertion hole 12 is formed, and the recess 13 is approximately A second fixing hole 14 penetrating into the insertion hole 12 is formed in the center.

When the insertion portion 6 is inserted into the insertion hole 12, the first fixing hole 8 formed in the insertion portion 6 faces the second fixing hole 14 formed in the synthetic rubber outer shell 9.

In this state, the screw shaft 16 of the set screw 15 is screwed in so as to communicate with the second fixing hole 14 and the first fixing hole 8, and the saw body 2 is fixed to the handle body 3. In this case, the second fixing hole 14 is a blank hole through which the screw shaft 16 can be inserted, as shown in FIG. Female threads are cut to match. Therefore, when the set screw 15 is tightened, the insertion portion 6 is attracted by the set screw 15, and as shown in FIG. On the other hand, it is tightly fixed to the inner wall (lower inner wall in the figure). Therefore, as described above, 1. Coupled with the fact that the rear end of the saw body 2 is received and held by the tip of the auxiliary core 10, the saw body 2 and the handle body 3 may become stiff. etc. will never occur.

In the above-mentioned case, in order to cut a female thread in the first fixing hole 8, it is sufficient if the thickness of the insertion portion 6 is, for example, about 1 mm.

Further, if the saw body 2 has a thin wall thickness, for example, when the wall thickness is about 0.4 mm as in the case of a so-called carpenter's saw, it is not necessary to form a female hole in the first fixing hole 8. , set screw 15
By forming the threaded shaft 16 with a larger pitch, the threaded shaft 16 and the first fixing hole 8 can be screwed together.

Alternatively, a through hole may be formed in the synthetic rubber outer shell 9 on the side opposite to the side where the set screw 15 is inserted, and the saw body 2 and the handle body 3 may be fixed by the set screw 15 and the nut. . In this case, the first fixing hole 8 may be a blank hole through which the screw shaft 16 passes.

Further, in the above embodiment, the outer shell 9 is made of synthetic rubber, but instead of synthetic rubber, it may be made of natural rubber or elastic resin.

4 and 5 show the shapes of the engagement protrusion 7 and the engagement recess 11 according to another embodiment.

As shown in FIG. 4, the engagement convex portion 7 may be a semi-circular convex portion, and the engagement recess 11 may be a semi-circular concave portion capable of receiving the convex portion.

Further, when the thickness of the auxiliary core is thick, the engagement recess 11 is not formed by recessing the entire tip of the auxiliary core 10, but by recessing only half of the thickness of the tip of the auxiliary core 10. It may be formed by .

Furthermore, in the above-described embodiment, the saw body 2 side may be an engagement recess, and the auxiliary core 10 side may be an engagement protrusion.

6 and 7 are diagrams showing other embodiments of the auxiliary core 10. FIG. As shown in FIGS. 6 and 7, the auxiliary core 1
A rib 17 extending in the length direction of the auxiliary core 10 may be formed on the auxiliary core 10 so that the thickness of the auxiliary core 10 is reduced and the strength is not impaired due to the reduced thickness.

<Effects of the Invention> Since the present invention is configured as described above, it is easy to replace the saw blade, and the saw blade attached to the handle body does not wobble against the handle body. It is possible to manufacture a replaceable blade type hand saw that is firmly fixed in a fixed position on the handle body without sticking or wobbling.

Further, according to this invention, the handle fits easily in the hand,
It is possible to make a hand saw that is hard to slip and has good operability.

Furthermore, the handle body is made of elastic material such as rubber, and is relatively thick, so when sawing, the vibrations generated in the blade of the saw body are transmitted to the operator's hands. It is possible to prevent this from being transmitted, making it possible to make a saw that is easy to handle and has good cutting ability.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a replaceable blade type hand saw according to an embodiment of the present invention. FIG. 2 is a side view of a replaceable blade type hand saw according to an embodiment of the present invention, and the handle portion is shown in cross section. FIG. 3 is a plan sectional view taken along the line ■--■ in FIG. 4 and 5 show the engagement convex portion 7 and the engagement recess 11.
FIG. 7 is a side sectional view and a top sectional view, respectively, showing other embodiments of the invention. 6 and 7 are a side view and a sectional view showing other embodiments of the auxiliary core 10. FIG. In the figure, 1...Replaceable blade hand saw, 2...Saw blade,
3... Handle body, 6... Insertion part, 7... Engagement convex part, 8... First fixing hole, 9... Outer shell, 10...
Auxiliary core, 11... Engaging recess, 12... Insertion hole, 14
. . . shows a second fixing hole, 15 . . . a set screw.

Claims (1)

[Claims] 1. Includes an elastic handle body and a saw blade that is removable from the handle body, and an auxiliary core of an appropriate length is embedded in the handle body except for the front part thereof. A concave or convex portion is formed at the tip of the auxiliary core, and an insertion hole into which the rear part of the saw blade can be inserted is formed in the front part of the handle body. is formed with a convex part or concave part that can fit with a concave part or convex part formed at the tip of the auxiliary core, and when the rear part of the saw blade is inserted all the way into the insertion hole of the handle body, The rear end of the saw blade and the tip of the auxiliary core are configured to engage with each other, and a first locking hole is formed in the rear part of the saw blade, and a first locking hole is formed in the front part of the handle body. A second locking hole is formed at a position opposite to the first locking hole when the rear part of the body is fully inserted into the insertion hole. A replaceable blade type hand saw characterized by being equipped with a communicating locking screw. 2. The replaceable blade type hand saw according to claim 1, wherein the first locking hole has a female thread cut on the inner circumferential surface, and the female thread is adapted to be screwed into the locking screw. It is characterized by the fact that it is