JPH0520483Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the improvement of a so-called replaceable blade type saw in which the saw blade can be attached and detached.

[Prior Art] As a so-called replaceable blade type saw in which the saw blade can be attached and detached, the one described in Japanese Utility Model Publication No. 57-26724 is known.

FIG. 6 is a side sectional view of a characteristic part of the saw described in this publication.

As shown in FIG. 6, this type of conventional saw consists of a saw blade holder 2 attached to the tip of a handle 1, and a saw blade 3 that is detachable from the saw blade holder 2. There is. The saw blade holder 2 is made by folding a steel plate in half, and is designed to rotate and insert the saw blade 3 into a holding groove 4 formed between the folded steel plates.

A circular locking portion 5 is formed in the clamping groove 4, while a recess 7 that engages with the locking portion 5 is formed in the proximal end 7 of the saw blade 3, and a blade 8 is formed in the proximal end 6. It is formed by cutting out from the side.

As a result, the saw blade 3, as shown by the dashed line,
It can be attached and detached by rotating approximately 45 degrees to 50 degrees with respect to the saw blade holding portion 2.

[Problems to be solved by the invention] However, in the conventional replaceable blade saw as described above, the saw blade cannot be attached or detached at an angle of 45 to 50 degrees with respect to the saw blade holder.
This was possible by rotating a certain degree,
Depending on how the saw is used, there is a problem that the saw blade may come off inadvertently.

For example, when attempting to remove the saw from the wood after making a cut in the underside of a horizontally arranged piece of wood, the saw blade may be caught in the wood and the saw blade may rotate from the saw blade holder. In some cases, there was a risk that the saw blade might come off.

The purpose of this invention is to solve the above-mentioned problems and provide a saw that is safe to handle and easy to use.

[Means for Solving the Problems] This invention is a saw consisting of a blade holding part provided on the handle and a single-toothed saw blade that can be attached to and detached from the blade holding part, and the saw blade has at least The rear end portion is a held portion held by the blade holding portion, and an engagement notch is formed in the held portion, and the notch is cut from the rear edge of the saw blade. The blade holding portion includes an insertion notch having a predetermined width and a circular locking notch having a diameter wider than the width of the insertion notch, and the blade holding portion is configured to cover the saw blade. It has a groove that clamps both side surfaces of the holding part, and within the groove, a locking piece for specifying the insertion direction of the held part and fixing the clamping position partially blocks the groove. The width of the locking piece when viewed from the direction in which the held portion is inserted is selected to be narrower than the width of the insertion notch, and the width of the locking piece when viewed from a direction perpendicular to the width of the locking piece is selected to be narrower than the width of the insertion notch. The saw blade has a substantially oval shape selected to be equal to the diameter of the locking notch, so that the saw blade can be attached to and removed from the blade holding portion only from the selected narrow width direction. It is something.

[Function] The locking piece provided in the clamping groove of the blade holder protrudes so as to partially block the groove, and has an approximately oval, vertically long shape, with its width extending in the direction of observation. The width as seen from the direction in which the saw blade is inserted is selected to be the narrowest.
Moreover, the width of the insertion notch cut from the rear end of the held part is wider than the width of the locking piece. Therefore, the saw blade can be inserted into the groove while the locking piece is locked in the insertion notch only from that direction.

After insertion, the locking notch and the locking piece are engaged, so the saw blade can be rotated approximately 90 degrees in the mounting direction.

When installed, since the locking notch and the locking piece are engaged, the saw blade will not shift within the blade holding portion.

[Example] Hereinafter, an example of this invention will be described in detail with reference to the drawings.

FIG. 2 is a left side view of a replaceable blade saw according to an embodiment of this invention. As shown in FIG. 2, the replaceable blade saw 10 consists of a handle 12, a blade holder 14 attached to the tip of the handle 12, and a saw blade 16 held by the blade holder 14. .

The handle 12 is a columnar body made of, for example, wood and has an oval cross-sectional shape, and has a notch formed at its tip.
Then, the rear half (not shown) of the blade holding part 14 is inserted and fixed therein.

FIG. 1 is a partially enlarged cross-sectional view of the portion in FIG. 2. 3 is a cross-sectional end view taken along the line - in FIG. 1, and FIG. 4 is a cross-sectional end view taken along the line - in FIG. 1.

The characteristic parts of this invention will be explained in detail with reference to FIGS. 1, 3, and 4.

First, mainly referring to FIG.
4 is made by folding a steel plate in two, for example, and a groove 18 into which the held portion 20 of the saw blade 16 can be inserted is formed between the folded steel plates.

In this embodiment, the held portion 18 is only the rear end portion of the saw blade 16, but the blade holding portion 14 is extended forward, and the rear end portion and back portion of the saw blade 16 are held by the blade holding portion. You may also do so.

An engagement notch 22 is formed in the held portion 20 . The engagement notch 22 consists of an insertion notch 26 cut from the rear edge of the saw blade, and a circular locking notch 28 following the insertion notch 26 . The width d1 of the insertion notch 26 is selected to be narrower than the diameter d2 of the locking notch 28. One of the features of this embodiment is that the engagement notch 22 is shaped so that the width of the insertion part is narrow and the locking part at the back thereof is large.

Next, as shown in FIG. 3, the width d3 of the groove 18 formed in the blade holding part 14 is determined by whether it is equal to the thickness of the held part 20 or by considering the elasticity of the steel plate forming the blade holding part 14. , is slightly narrower than the thickness of the held portion 20. As a result, both side surfaces of the held part 20 can be held by the blade holding part 14.

A locking piece 30 is provided in a protruding manner within the groove 18, as shown in FIGS. 1 and 3. Locking piece 30
For example, as shown in FIG.
It is made by driving one side plate of the steel plate facing the other side plate.

The thickness d4 of the locking piece 30 is equal to the width d3 of the groove 18.
, and partially closes the groove 18.

As shown in FIG. 1, the side surface of the locking piece 30 is approximately oval and vertically long. More specifically, in the side shape of the locking piece 30, the left and right width d5 is selected to be slightly narrower than the width d1 of the insertion notch 26, and the vertical width d6 is selected to be the diameter d2 of the locking notch 28. are chosen equally.

The left and right opposing sides are parallel, and the top and bottom opposing sides are circular arcs that curve outward from each other.
It comes into contact with the inner wall of the locking notch 28 .

Attachment and detachment of the saw blade 16 is performed with the saw blade 16 rotated approximately 90 degrees from the attached state.

That is, as shown by the dashed line in FIG.
Insert 0. At this time, the locking piece 30 of the blade holding part 14 is provided so as to protrude so as to partially block the groove 18, and has a substantially oval-shaped vertically long shape, and its width is in the direction of observation. The width of the insertion notch 26 cut from the rear end of the held part 20 is selected to be the narrowest when viewed from the direction in which the saw blade 16 is inserted. 30
Since the width of the saw blade 16 is wider than the width of the saw blade 16, only from this direction.
can be inserted into the groove 18. Part to be held 2
The saw blade 16 can rotate in the direction of arrow A in a state in which the locking notch 28 formed at 0 and the locking piece 30 are engaged. The attachment of the saw blade 16 is then completed by rotating the saw blade 16 approximately 90 degrees so that its upper edge 32 comes into contact with the groove bottom 34.

When removing the saw blade 16, the above-mentioned procedure may be reversed.

The insertion direction when inserting the saw blade 16 into the blade holding part 14 is determined by the direction of the locking piece 30, but as mentioned above, it is recommended to insert the saw blade 16 from a state where it has been rotated by more than 90 degrees with respect to the installed state. For safe handling, it is preferable to do so.

As described above, according to this embodiment, the saw blade 16
Attaching and detaching is possible only when the saw blade 16 is rotated approximately 90 degrees from the attached state. Therefore, while the saw 10 is in use, there is no possibility that the saw blade 16 will rotate until it is substantially perpendicular to the handle 12, and there is no fear that the saw blade 16 will come off inadvertently during use.

In one embodiment of the invention described above, the following configuration is further added.

The held portion 20 of the saw blade 16 has an engagement notch 22.
A small hole 36 is formed at a predetermined distance from the hole 36.

Further, as shown in FIG. 4, the blade holder 14 has a small hole 3 when the saw blade 16 is attached
A small protrusion 38 is formed at a position corresponding to 6. Therefore, when the saw blade 16 is installed, the small hole 36 and the small protrusion 38 engage with each other, so the saw blade 16
cannot be easily rotated from the installed position. That is, although the small protrusion 38 protrudes into the groove 18, due to the elasticity of the blade holding part 14, etc., it does not significantly impede the rotation for mounting the saw blade 16, but on the other hand, it does not engage with the small hole 36. This prevents the saw blade 16 from rotating from the mounted state.

Note that the number of small holes 36 and small projections is not limited to one pair, but may be two or more pairs.

FIG. 5 is a perspective view of a replaceable blade saw 40 according to another embodiment of the invention. In the embodiment shown in FIG. 5, the blade holding portion 14 is provided integrally with the handle 12.

For example, when molding the handle 12 with resin, the bar 42 that contacts the upper edge of the saw blade 16 and the locking piece 44 are integrally molded, and the tip of the handle itself becomes the blade holding part 14. You can leave it there.

Such an embodiment is particularly suitable for small replaceable blade saws.

[Effects of the invention] As described above, according to this invention, the saw blade can be attached and detached only when the saw blade is rotated approximately 90 degrees from the attached state, so it is possible to attach and detach the saw blade while the saw is in use. This has an excellent effect in that the saw blade does not rotate until it is almost perpendicular to the handle, and there is no fear that the saw blade will come off inadvertently during use.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view for explaining the characteristic parts of an embodiment of this invention. Figure 2 shows
FIG. 2 is a side view of an embodiment of this invention. Figure 3 shows
FIG. 2 is a cross-sectional end view taken along the line - in FIG. 1; 4 is a cross-sectional end view taken along the line - in FIG. 1. FIG. FIG. 5 is a perspective view of a saw according to another embodiment of the invention. FIG. 6 is a side partial sectional view for explaining the configuration of a conventional replaceable blade type saw. In the figure, 10 is a replaceable blade saw, 12 is a handle, and 14
1 is a blade holding part, 16 is a saw blade, 18 is a groove, 20 is a held part, 22 is an engagement notch, 26 is an insertion notch,
28 is a locking notch, and 30 is a locking piece.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A saw consisting of a blade holder provided on the handle and a single-toothed saw blade that can be attached to and detached from the blade holder, the saw blade having at least its rear end. is a held part held by the blade holding part, and an engagement notch is formed in the held part,
The notch includes an insertion notch of a predetermined width cut from the rear edge of the saw blade, followed by a circular locking notch having a diameter wider than the width of the insertion notch. The blade holding part has a groove that clamps both side surfaces of the held part of the saw blade, and a groove is provided in the groove for specifying the insertion direction of the held part and fixing the holding position thereof. A locking piece is provided to protrude so as to partially block the groove, and the locking piece is
The width when viewed from the direction in which the held portion is inserted is selected to be narrower than the width of the insertion notch, and the width when viewed from a direction perpendicular to the insertion notch is approximately equal to the diameter of the locking notch. A saw characterized in that it has an oval shape, whereby the saw blade can be attached to and removed from the blade holding part only from the narrowly selected direction. (2) A small hole is formed in the held part at a position a predetermined distance away from the engagement notch, and the small hole is formed in the groove of the blade holding part when the saw blade is attached. The saw according to claim 1, characterized in that a small protrusion is formed to engage with the saw.