JPH0646641Y2 - Saw blade holding structure, saw handle and spare blade type saw having the holding structure - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to an improvement in a structure for holding a saw body, and a saw handle and a replacement using the improved structure for holding a saw body. It concerns a bladed saw.

<Prior Art> Conventionally, various removable blade-holding structures have been proposed for replaceable saws.

For example, Japanese Utility Model Publication No. 46-11833, Japanese Utility Model Publication No. 56-39601, Japanese Utility Model Publication No. 60-32962, and Japanese Utility Model Publication No. 61-16084 have devised a structure for holding a saw body using screws. There is.

In addition, in Japanese Utility Model Publication No. 53-1674 and Japanese Utility Model Publication No. 57-26724, a holding groove into which a saw body is inserted is formed by bending a steel plate, and the elastic force of the steel plate is used to form the saw body on both sides. Has proposed a replaceable blade type saw including a structure for holding the blade.

<Problems to be solved by the invention> In the conventional saw body holding structure as described above, in the former case, since the holding structure includes the screw, the user uses the fingers to attach and detach the screw when attaching and detaching the saw body. However, since the screw protrudes to the outside, it is unclean or bulky.

On the other hand, in the latter case, there is no such problem, but due to the structure that the holding groove holds the saw body, elasticity is required for the member forming the holding groove, and in practice, it is formed by bending a steel plate. I couldn't form it. Therefore, the whole saw pattern
For example, even if it is attempted to be integrally formed by die casting or the like, there is a drawback in that such a saw-tooth supporting structure cannot be adopted.

Further, in the latter case, the width of the holding groove may gradually widen due to long-term use, and in such a case, there is a problem that the retention of the saw body becomes unstable.

Therefore, the present invention is capable of stably holding a saw body, allows easy attachment / detachment of the saw body, and has no apparent appearance or bulkiness, and a structure for holding the saw body. An object of the present invention is to provide a saw handle and a replaceable blade type saw.

<Means for Solving the Problems> The invention according to claim 1 fits in a recess for engagement that engages with the pivot and a position separated from the recess for engagement. There is a gap into which the rear end of the saw body having a joint hole can be inserted, and one side wall of the gap has a fitting fit into the fitting hole of the rear end of the inserted saw body. A fitting protrusion is provided, and the fitting protrusion has an outer peripheral surface that is tapered or substantially arcuate in the biasing direction. Further, the fitting protrusion faces from one side wall side of the gap. Is elastically urged toward the other side wall, and can be embedded in the one side wall by being pressed against the elastic force. A pressing member capable of pressing the fitting protrusion is provided, and a wall surface corresponding to the fitting protrusion has one of the fitting protrusions. A concave portion for receiving the portion is formed, and at a position different from the position where the fitting protrusion is provided in the gap and corresponding to the locking concave notch portion of the saw body rear end portion. The saw-body holding structure is characterized in that a stopper pin for locking the locking recess is provided.

The invention described in claim 2 is a saw handle, characterized in that the saw-body holding structure according to claim 1 is provided at the tip thereof.

The invention as set forth in claim 3 is a replaceable blade type saw including a saw body and a saw handle to which the saw body is detachable, wherein the saw body has a recess for locking at a rear end thereof. A notch and a fitting hole are provided, the saw handle has a gap into which the rear end of the saw can be inserted, and one side wall of the gap has a fitting hole for the saw. A fitting protrusion capable of fitting is provided, and the outer peripheral surface of the fitting protrusion is tapered or substantially arcuate in the biasing direction. It is elastically urged from one side wall toward the opposite side wall side, and can be embedded in the one side wall by being pressed against the elastic force, and the other side wall is Is provided with a pressing member capable of pressing the fitting protrusion, and a side surface corresponding to the fitting protrusion. Is formed with a recess for receiving a part of the fitting projection, and further, at a position different from the position where the fitting projection is provided in the gap, a recess for locking the saw body is formed. A replaceable blade saw, characterized in that a stopper pin for engagement is provided.

<Operation> When attaching the saw blade, insert the saw blade into the gap, and rotate the hook by turning the hook notch into the stopper pin that serves as the rotation fulcrum. It hits the fitting projection that is elastically projected on the. At this time, the fitting protrusion is pressed by the pressing member. Then, the fitting protrusion can be pressed by the edge of the saw blade, and when the saw blade is rotated thereafter, the saw blade further presses the fitting protrusion to be buried in the one side wall. Then, when the through hole for holding the saw body and the fitting protrusion coincide with each other, the fitting protrusion fits into the through hole by the elastic force. Therefore, the saw body is reliably and stably held by the holding structure.

Since the outer peripheral surface of the fitting projection is tapered or substantially arcuate in the biasing direction, the fitting projection can be smoothly pressed by the saw blade. Further, since the tip of the fitting protrusion can be received in the concave portion formed on the other side wall, when the saw body is attached, the saw body is reliably held by the fitting protrusion.

When removing the saw blade, by pressing the pressing member and applying an appropriate impact or pushing force to the back side of the tip of the saw blade, the holding through hole and the fitting protrusion come off, and the saw blade is easily removed. It can be removed.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 7 is a perspective view of a tip portion of a saw handle 1 according to an embodiment of the present invention. The saw handle 1 includes a grip portion 2 that is gripped by a user and a saw guide portion 3 that projects from the tip of the grip portion 2. Grip part 2 and saw body guide part 3
In this embodiment, aluminum is used as the material, and a pair of left and right members (in the front-back direction of the paper in the figure) integrally formed by die casting are formed in combination.

A large step is provided at a boundary portion 4 between the grip portion 2 and the saw body guide portion 3. That is, the grip portion 2 is selected such that its lateral width (thickness) is the easiest to grip, and the saw body guide portion 3 has a relatively thin lateral width in the extending direction of the saw body. As a result, there is an advantage that a large step is generated at the boundary portion 4 between the grip portion 2 and the saw body guide portion 3 and the directionality of the saw body can be easily confirmed.

A gap 5 into which the saw body can be inserted is formed at the tip end portions of the saw body guide portion 3 and the grip portion 2. The gap 5 is formed so that the saw blade can be inserted from the lower side, and the saw blade holding structure is provided in the gap 5.

A slip stopper such as rubber may be embedded in the side surface of the grip portion 2.

FIG. 1 is a sectional view taken along the line I-I of FIG.
FIG. 4 is a plan sectional view of a tip portion of Also, FIGS. 2 to 4
The figure is a figure for demonstrating the function of the saw handle 1 of FIG. Next, the features of the saw blade holding structure provided in the saw handle 1 will be described mainly with reference to FIG.

On the one side wall 5a of the gap 5, the first portion formed relatively deeply
A recess 6a is provided. Also, the other side surface 5b of the gap 5
A second recess 6b is formed on the wall surface facing the first recess 6a.

A coil spring 7 is built in the first recess 6a, and further,
A steel ball 8 elastically biased toward the second recess 6b by the coil spring 7 is provided. The second recess 6b is a recess that can receive a part of the steel ball 8.

In the normal state, as shown in FIG. 1, since the steel ball 8 is biased by the coil spring 7 toward the second recess 6b, the gap 5 is blocked by the steel ball 8. There is.

A pressing pin 10 is also provided on the second recess 6b side. The pressing pin 10 has a head surface 10S that is substantially flush with the one outer surface 1b of the saw handle 1, and as shown in FIG. 8
Is pressed against the biasing force of the coil spring 7 by a certain amount. The head surface 10S of the pressing pin may be formed to have the same thickness as that of the shaft of the pressing pin 10 without expanding the area thereof, and the tip may be projected from the outer side surface of the saw handle 1 to facilitate pressing. .

The tip 10t of the pressing pin 10 has a saw handle 1
It has a slightly larger diameter so that it does not fall out.

When the steel ball 8 is completely pressed against the biasing force of the coil spring 7, the steel ball 8 can be buried in the first recess 6a as shown in FIG.

In FIG. 1, a stopper pin 9 is further provided in the gap 5. The stopper pin 9 is provided at a position different from the position where the steel ball 8 is provided, that is, in the present embodiment, on the relatively inner side of the gap 5.

FIG. 5 and FIG. 6 are side cross-sectional views for explaining the action of the saw-body holding structure when the saw body 11 is attached to or detached from the saw body 11.

Next, the operation of the saw-body holding structure according to this embodiment will be described with reference to FIGS. 1 to 6.

As shown in FIG. 5 and FIG. 6, at the rear end of the saw body 11, there is a recess 12 for engagement that engages with the stopper pin 9, and from the recess 12 for engagement. A fitting hole 15 is formed at a distant position corresponding to the position where the steel ball 8 is provided.

First, as shown by the chain double-dashed line in FIG. 5, the rear end of the saw body 11 is inserted into the gap 5 from below, and the locking recess 12 formed in the lower rear end of the saw body 11 Is hooked on the stopper pin 9, and the saw body 11 is rotated upward as indicated by an arrow 13. In other words, using the stopper pin 9 as a pivot,
Rotate 11. Eventually, the spine 14 of the saw blade 11 comes into contact with the central portion of the steel ball 8 (see FIG. 1) located in the gap 5.

When the spine 14 of the saw body 11 contacts the steel ball 8,
The saw blade 11 cannot rotate any further. Therefore, at this time, the head surface 10s of the pressing pin 10 is pressed, and the steel ball 8 is pressed by a certain amount against the biasing force of the coil spring 7 (see FIG. 2).
Then, the spine 14 of the saw body 11 and the contact surface of the steel ball 8 are
It shifts from the center to the end. If the offset position is set appropriately, the steel ball 8 can be pressed by the spine 14 of the saw body 11.

Then, as shown in FIG. 3, the steel ball 8 is pressed by the saw blade 11 and is completely buried in the first recess 6a. Therefore, the saw body 11 can be further rotated.

When the saw body 11 is completely rotated, the fitting hole 15 formed in the saw body 11 and the steel ball 8 are fitted together.
Therefore, in this state, the steel ball 8 is biased by the coil spring 7 in the direction of the second recess 6b as shown in FIG. 4, fits in the fitting hole 15, and completely closes the gap 5. It becomes a state. Therefore, the saw blade 11 is securely stopped by the steel ball 8.

In this state, a part of the spine 14 of the saw body 11 contacts the upper bottom 5c of the gap 5 (see FIG. 6). By bringing the spine 14 of the saw body 11 into contact with the end 5c of the gap 5 in this manner, there is an advantage that the retention of the saw body 11 in the gap 5 becomes more stable.

In the state where the steel ball 8 is fitted in the fitting hole 15 of the saw body 11, the saw body 11 has two positions, the stopper pin 9 and the steel ball 8,
It is securely held in the gap 5. Further, since the steel ball 8 is fitted into the fitting hole 15 of the saw body 11 by the biasing force of the coil spring 7, there is no concern that the steel ball 8 will fall out of the fitting hole 15 of the saw body 11. .

In this case, if the width of the gap 5 is made equal to the thickness of the saw blade 11, the saw blade 11 will not rattle right and left in the gap 5. Further, it is not necessary that the gap 5 has the resilience for gripping, unlike the one formed by bending the steel plate, as described in the latter of the related art.

When removing the saw blade 11 from the gap 5, press the pressing pin 10 to move the steel ball 8 to a certain position, and lightly shock the tip of the spine 14 of the saw blade 11 in that state. Good. As a result, the saw body rotates about the stopper pin 9, and the steel ball 8 is pressed by the saw body 11 and is completely buried in the first recess 6a (see FIG. 1).

FIG. 8 is a partial side sectional view of a replaceable blade type saw according to another embodiment of the present invention. In the embodiment shown in FIG. 7, a locking recess 12 is formed in the upper part of the rear end of the saw body 11, and the saw body 11 protruding from the upper bottom 5c in the gap 5 is formed accordingly. There is provided a stopper pin 9 which serves as a rotation fulcrum. As described above, the stopper pin 9 that locks a part of the saw body 11 and serves as a pivotal fulcrum of the saw body 11 has an arbitrary position in the gap 5 different from the position where the steel ball 8 is provided. It is possible to form

9 to 11 are sectional views showing the characteristics of a saw blade holding structure according to another embodiment of the present invention. In the embodiment shown in FIGS. 8 to 11, a dome-shaped fitting projection 16 is used instead of the steel ball 8. In this way, the depth of the first recess 6a can be made shallower than that of the embodiment shown in FIGS.

The rest of the configuration in FIGS. 8 to 11 is the same as that of the embodiment in FIG. 1, and the same or corresponding parts are designated by the same reference numerals and the description thereof is omitted here.

12 and 13 are a perspective view and a plan sectional view of a tip portion of a saw handle 20 according to still another embodiment of the present invention. The features of the saw handle 20 shown in FIGS. 12 and 13 are:
The saw body guide portion 3 is formed with a fitting structure such as a coil spring 7 and a steel ball 8. More specifically, the gap 5 located in the tip portion of the gap 5, that is, in the saw blade guide portion 3.
A first recessed portion 6a and a second recessed portion 6b are formed therein, a coil spring 7 and a flat steel ball 8 are arranged in the recessed portion, and a pressing pin 10 is provided. The saw guide 3
The width (thickness) is relatively thin so that the orientation of the saw body can be easily confirmed. For this reason, the parts provided with the above-mentioned fitting structure are provided with small humps 17a, 17 on both side surfaces of the saw body guide portion 3.
b has occurred. However, the small humps 17a and 17b are not necessary and formed, but only as a result of providing the fitting structure therein.

The rest of the configuration is the same as the saw pattern already described, and the same parts are designated by the same reference numerals and the description thereof is omitted here.

Instead of the steel ball 8 or the dome-shaped fitting protrusion 16 as the fitting protrusion in each of the above-described embodiments, a tapered fitting protrusion whose outer peripheral surface is tapered in the biasing direction may be used.
If the outer peripheral surface of the fitting projection has a taper shape that tapers in the urging direction or a substantially arcuate shape as in each of the above-described embodiments, the fitting projection can be smoothly pressed by the saw blade.

<Effect of the Invention> As described above, according to the present invention, the saw pin is locked or held at two points in the gap by the stopper pin and the fitting protrusion, and the fitting protrusion is projected and retracted in the gap. Since the configuration is made possible, it is possible to provide a saw-body holding structure in which the saw-body can be easily attached and detached and can be stably and reliably held while the saw-body is held.

In addition, a saw handle or saw blade with this saw-holding structure makes it easier to put on and take off the saw blade compared to the conventional one, and it can be held stably, and its appearance is also good. Does not spoil.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a tip portion of a saw handle according to an embodiment of the present invention. 2 to 4 are plan cross-sectional views of the tip portion of the saw handle according to the embodiment of the present invention, which illustrate the function when the saw body is inserted. FIG. 5 and FIG. 6 are side sectional views of a saw handle for explaining the operation of the embodiment of the present invention. FIG. 7 is a perspective view of a tip portion of a saw body according to an embodiment of the present invention. FIG. 8 is a partial side sectional view of a replaceable blade type saw according to another embodiment of the present invention. 9 to 11 are partial sectional views of a saw blade holding structure according to another embodiment of the present invention. 12 and 13 are explanatory views of a saw handle according to still another embodiment of the present invention. In the figure, 1 ... saw pattern, 3 ... saw body guide part, 5 ...
… Gap, 5a …… One side wall, 5b …… Other side wall, 6a …… First
Recess, 6b ... Second recess, 7 ... Coil spring, 8 ... Steel ball as an example of fitting protrusion, 9 ... Stopper pin, 10 ... Pressing pin, 11 ... Saw, 12 ... It shows a recessed part for stop, 15 ... Fitting hole, 16 ... Fitting protrusion.

Claims (3)

[Scope of utility model registration request] 1. A rear end portion of a saw body having a locking recessed portion that engages with a rotation fulcrum and a fitting hole formed at a position apart from the locking recessed portion can be inserted. Has a gap, and one side wall of the gap is provided with a fitting protrusion that fits into the fitting hole at the rear end of the inserted saw body, and the fitting protrusion is
The outer peripheral surface thereof has a taper shape or a substantially arc shape that tapers toward the urging direction, and further, the fitting protrusion is
The gap is elastically urged from one side wall side toward the other side wall opposite, and is capable of being buried in the one side wall by being pressed against the elastic force, The other side wall is provided with a pressing member capable of pressing the fitting protrusion, and a wall surface corresponding to the fitting protrusion is formed with a recess for receiving a part of the fitting protrusion, Furthermore, the engaging recess is engaged with the engaging protrusion at a position different from the position where the fitting protrusion is provided in the gap and corresponding to the engaging recess of the rear end of the saw body. A saw-body holding structure characterized in that a stopper pin for stopping is provided. 2. A saw handle, characterized in that the saw blade holding structure according to claim 1 is provided at the tip thereof. 3. A replaceable blade type saw including a saw body and a saw handle having a removable saw body, wherein the saw body has a recessed portion for engagement and a fitting hole at a rear end thereof. The saw handle has a gap into which the rear end of the saw can be inserted, and one side wall of the gap has a fitting projection capable of fitting with the fitting hole of the saw. The fitting projection has an outer peripheral surface which is tapered or substantially arcuate in a tapering direction toward the biasing direction, and the fitting projection is provided on the other side wall facing from one side wall of the gap. Is elastically urged toward the side, and can be embedded in the one side wall by being pressed against the elastic force, and the fitting protrusion is provided on the other side wall. A pressing member that can be pressed is provided, and the side surface corresponding to the fitting protrusion has the fitting protrusion. Is formed with a recess for receiving a part of the stopper and a stopper for engaging with the recess for locking the saw body at a position different from the position where the fitting protrusion is provided in the gap. Spare blade saw, characterized by having a pin.