JPH0242402Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a folding saw, and more specifically, when the saw blade is pulled out from the sheath body in a looped manner, the saw blade is in the drawn out state (in use state). This invention relates to a folding saw with a lock.

[Prior art]

For folding saws in which the sheath body and the saw blade are pivotally connected by a support shaft, and the saw blade can be pulled out from the sheath body or folded into the sheath body, the saw blade cannot be pulled out from the sheath body. It is customary to be locked in such a state that it cannot be rotated. For example, in the case described in Japanese Utility Model Publication No. 49-1916, a locking ring pivotally attached to the tip of the sheath body is After hooking on the engaging part on the back of the saw blade pulled out from the body, the operating piece is pulled towards the rear end of the sheath body to lock it, and to release the lock, the operating piece engages with the locking ring. With the saw blade loosely engaged, a force in the folding direction is applied to the saw blade, thereby causing the engaging part to disengage from the locking ring.

[Problem that the invention attempts to solve]

As described above, the locking operation according to the conventional example described above has the drawback that it is time-consuming because it requires two operations: one for hooking the locking ring onto the engagement portion of the saw blade, and the other for tilting the operating piece backward. At the same time, if you neglect to lock the saw blade when you pull it out, especially if you do not properly engage the locking ring on the saw blade engagement part, you may misunderstand that the saw is locked while using the saw, and this may lead to an unexpected accident. occurs.

Therefore, with the present invention, the saw blade can be locked and unlocked with a simple operation. In particular, when the saw blade is pulled out of the sheath body, the lock can lock the locking ring to the saw blade by simply operating one operation piece. To provide a folding saw that can be automatically hung on a joint.

[Means to solve the problem]

In the present invention, a guide tongue piece is provided protruding from the tip of the sheath body to the side surface of the base of the saw blade when it is pulled out, and at the base of the saw blade, the guide tongue piece protrudes onto the guide tongue piece when the saw blade is pulled out and serves as a guide when the saw blade is folded. An approximately U-curve having an engaging portion recessed into the tongue, an operating piece that can be raised and folded about a fulcrum pin attached to the sheath body, and the operating piece can be engaged with the protruding engaging portion. By locking a locking ring shaped like the shape of the locking ring to the operation piece with both leg ends of the locking ring being positioned in different directions back and forth relative to the fulcrum pin,
A folding saw is characterized in that this locking ring is given an elastic force in the direction of pressing the sheath body.

[Effect]

According to the above-mentioned means, since the locking ring is locked to the operating piece with both legs of the locking ring at different positions in the front and rear, the locking ring uses a twisting force based on the difference in the turning radius of the locking ring legs, that is, an elastic force. The locking ring, together with the operating piece, is always pressed against the sheath body, so when in use, the sheath body is pulled out in front of the sheath body while rotating the saw blade, and then the sheath body is pushed aside. By slightly raising the lying operation piece against the elastic force, the locking ring is automatically engaged with the engagement portion of the saw blade that protrudes upward from the guide tongue. In this state, the operation piece can be locked simply by pushing the operation piece aside toward the sheath. The saw blade can be stored in the sheath by rotating the saw blade around the sheath while the operation piece is raised.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a sheath body that also serves as a handle, and the proximal end of the saw blade 2 is inserted into the bifurcated portion of the distal end of this sheath body 1, and by connecting the two with a shaft punch 3 at this part, the saw blade 2 is inserted into the sheath body 1. Freely installed drawers and foldable storage. 4 shown in Fig. 4 is the saw blade pivoting part at the tip of the sheath body,
These are seat plates that are fixed opposite to each other with the base of the saw blade sandwiched between them, and a stopper pin 5 is fixed through the seat plates 4.
When the saw blade 2 is rotated until it is in a straight line with the sheath body 1 (FIGS. 3 and 4), the step 6 formed at the base of the saw blade comes into contact with the stopper pin 5, and The blade drawer position is regulated. Further, a protrusion 7 is provided on the seat plate 4 directly above the stopper pin 5 so as to protrude outward, and a guide tongue piece 9 having a recess 8 in front thereof extends toward the front upper part of the sheath body 1. Formed protrudingly. Furthermore, saw blade 2
The base of the saw blade protrudes upwardly and outwardly from the seat plate 4 at the position of the recess 8 when the saw blade is pulled out until it is in line with the sheath body 1, and inside the seat plate 4 when the saw blade is folded. An engaging portion 10 is expanded to be recessed into the holder.

The base of the protrusion 7 of the seat plate 4 has a fulcrum pin 11.
An operating piece 12 is attached which is pivoted at , and a locking ring 13 is further engaged with the operating piece. This locking ring 1
3 is an engaging portion 1 projecting above the recess 8 of the seat plate 4;
Both leg ends 14a, 1 of this locking ring 13 are formed into a U-curved shape so that the tip can be engaged with the locking ring 13, and are also bent into a U-shape when viewed from the side.
5a is engaged at a position close to the middle of the operation piece near the fulcrum pin 11, and the operation piece 12 is moved to the fourth position.
When the state shown in the figure is rotated backward and laid down on the sheath body 1 as shown in FIG. ing. Further, as is clear from FIG. 2, both leg ends 14a and 15a of the locking ring 13 are engaged at different positions back and forth relative to the fulcrum pin 11, that is, at different distances from the fulcrum pin 11. Due to the difference in the end locking position, the lengths of both legs 14 and 15 of the locking ring 13 are divided into large and small lengths, and from this, each leg 1
4 and 15, which generates a twisting force on the locking ring itself, and this twisting force always urges the locking ring 13 to rotate in the direction of pressing against the sheath body 1. The locking ring 13 is provided with a breaking force that opposes the force in the direction of separating it from the sheath body 1. Furthermore, the tip of the locking ring 13 is located facing above the recess 8.

In the folding saw configured in this manner, when the saw blade 2 is pulled out from the folded state as shown in FIG. A portion 10 projects upwardly and outwardly from the seat plate 4 at the position of the recess 8. On the other hand, since the locking ring 13 is pressed against the sheath body 1 by its own twisting force (elastic force), the engaging portion 10 does not escape from the force exerted thereon. Therefore, when the operating piece 12 is slightly pulled up from the state shown in FIG. When engaged, the saw blade is locked in its drawn-out position and can be used as a saw (Figure 3).

Next, when folding the saw blade 2 into the sheath body 1, as shown in FIG. The anchoring points, that is, the locking ring both leg ends 14a, 15
a exceeds the fulcrum pin 11 upwardly and is stabilized in the posture shown in FIG. 4 by a so-called toggle action. and,
When a force is applied in the direction of folding the saw blade 2 into the sheath body 1,
The engaging part 10 hooks the tip of the locking ring 13 and pulls it forward, and while the locking ring 13 rides on the guide tongue 9, the engaging part 10 pulls the locking ring 13 forward.
By recessing into the saw blade 1, the engaging portion 10 and the locking ring 13 are disengaged, and the saw blade 2 is unlocked. At this time, the locking ring 13, which is disengaged and becomes free, assumes a posture in which its tip is in contact with the concave portion 8, so that the operating piece 12, which is pulled upward, is held against the sheath body. By pushing it down, you can return it to the state shown in Figure 1.

〔effect〕

As described in detail above, according to the present invention, both leg ends of the locking ring that is engaged with the engaging portion on the saw blade side and locks the saw blade in the drawn-out state are moved back and forth with respect to the fulcrum pin of the operating piece. Because the locking ring is locked in the wrong position, a breaking force is generated in the locking ring in the direction that it always comes into contact with the sheath body.For this reason, when the saw blade is pulled out from the folded state toward the front of the sheath body, By simply raising the operating piece slightly above the sheath body and then tilting it backward, the locking ring is automatically engaged with the engaging portion and locked. For this reason, you can use a folding saw with very little effort, and the locking is automatic, so
It is possible to prevent unexpected accidents caused by forgetting to insert the lock.

[Brief explanation of the drawing]

The drawings show a folding saw according to the present invention. Figure 1 is a front view of the folded saw, Figure 2 is a perspective view of the main part of Figure 1, and Figure 3 is a front view of the main part of the saw blade in the pulled out state. , FIG. 4 is a sectional view during the lock release operation. 1...Sheath body, 2...Saw blade, 9...Guide tongue piece,
DESCRIPTION OF SYMBOLS 10... Engagement part, 11... Work point pin, 12... Operating piece, 13... Locking ring.

Claims (1)

[Scope of utility model registration request] A guide tongue piece is provided protruding from the tip of the sheath body to the side surface of the base of the saw blade when it is pulled out, and at the base of the saw blade, it protrudes onto the guide tongue piece when the saw blade is pulled out, and inside the guide tongue piece when the saw blade is folded. A substantially U-curved engagement portion is formed, and an operating piece that can be raised and folded around a fulcrum pin is attached to the sheath body, and the operating piece can be engaged with the protruding engagement portion. By locking the locking ring to the operating piece with both leg ends of the locking ring in different positions forward and backward relative to the fulcrum pin, an elastic force in the direction of pressing the sheath body is imparted to the locking ring. A folding saw.