JPH09277202A - Lock mechanism of saw body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the revolution of a saw body in a use state by allowing a lock member to function as both of the engaging part engaged with the engaging groove of a saw body part and an energizing member energizing the engaging part to the engaging groove. SOLUTION: Since the first shaft part 23 supporting the first arm part 22 of a lock member 20 and the second shaft part 25 supporting the second arm part 24 thereof are mutually shifted in the forward and rearward directions of a handle 1, the forces ready to revolve around the shaft parts 23, 25 of the handle are set off by attaching the shaft parts 23, 25 to the end part of the handle 1 and the lock member 20 is stopped in a predetermined posture. When a saw body 3 in a non-housed posture is displaced to a use posture in this state, the engaging part 21 of the lock member 20 is elastically engaged with the engaging groove 3a provided to the root part of the saw body 3 to prevent the revolution of the saw body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saw blade locking mechanism, and more particularly to a saw blade locking mechanism for a folding saw.

[0002]

2. Description of the Related Art Generally, a locking mechanism for this type of saw is
By connecting the end of the handle with the saw body storage groove and the base of the saw body with a shaft, fold the saw body around the above axis and store it in the handle storage groove of the handle. A lock that locks the rotation of the saw body in use by holding it so that it can be rotated and displaced in the use posture extended from the handle and engaging with a locking groove formed in the base of the saw body. A member is attached to the handle end.

FIG. 5 is a sectional view showing an example of a conventional saw body locking mechanism. In the configuration of FIG. 5, the sawtooth storage groove 1
A bolt 2 is inserted through an end portion of a handle 1 having a, and the saw body 3 is rotatably connected by the bolt 2.
A support shaft 4 parallel to the bolt 2 is provided at the end of the handle 1, and a lock member 5 is rotatably supported via the support shaft 4. The lock member 5 is a metal member having a U-shaped cross section whose middle portion is supported by the support shaft 4, and one end of the lock member 5 has a locking groove for the saw body 3 attached to the bolt 2. An engaging claw 5a that engages with 3a is integrally formed. The other end of the lock member 5 is connected to the support shaft 4
It is biased by a spring 6 attached to. The urging force of the spring 6 urges the locking claw 5a in the direction of locking the locking groove 3a.

[0004]

In the above-described conventional lock mechanism, it is an important requirement that the saw body 3 does not rotate toward the handle 1 when the saw body 3 is extended and used. However, when the above-described lock mechanism is used, two members, the lock member 5 and the spring 6, are always required to satisfy the above requirements. This is because, in order to prevent the saw blade 3 from rotating during use, the locking claw 5a must be kept locked in the locking groove 3a. This is because it is necessary to constantly bias the lock member 5 with the spring 6 in order to maintain the locked state of the claw 5a and the locking groove 3a. Therefore, the conventional saw-toothed lock mechanism has a number of parts, a complicated structure, and a high cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a simple saw-tooth lock mechanism capable of reducing the number of parts.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a saw-body locking mechanism according to the present invention connects an end portion of a handle having a saw-body storage groove and a base portion of the saw body by a shaft. , The saw body is folded around the axis and is housed in the saw body storage groove of the handle so that the saw body can be housed in the housing posture and the saw body can be extended from the handle. In the mechanism for locking a saw having a lock member attached to the end of the handle, the lock member locking the rotation of the saw in use by engaging with the locking groove formed in , A locking portion that extends substantially parallel to the axis and can be locked in the locking groove, a first arm portion that is continuous with one end portion of the locking portion, and a continuous portion that is continuous with the end portion of the first arm portion. A first shaft portion attached to the handle end portion substantially parallel to the shaft, and A second arm portion that is continuous with the other end portion of the portion, and a handle end portion that is continuous with the end portion of the second arm portion and that is offset from the first shaft portion substantially parallel to the first shaft portion. It is formed of a metal elastic member having a second shaft part to be mounted, and the mounting positions of the first and second shaft parts are such that they are locked in the locking groove of the saw body in use. The lock mechanism for a saw body is characterized in that the portion is arranged so as to be biased so as to be locked.

In this saw body locking mechanism, the first shaft portion supporting the first arm portion of the lock member and the second shaft portion supporting the second arm portion are displaced from each other. By attaching these shaft portions to the handle end portions, the forces that try to rotate around the respective shaft portions are canceled out, and the lock member stands still in a predetermined posture. In this state, when the saw body in the storage posture is displaced to the use posture, the locking portion of the lock member is elastically locked in the locking groove of the base of the saw body to rotate the saw body. Will be stopped.

Further, the above-mentioned saw body locking mechanism has a main body portion that covers the lock member, a connecting claw that connects each arm portion of the lock member to the main body portion, and is formed continuously with the main body portion to lock the body. A cover member is further provided, which protrudes to the opposite side of the locking portion from both shaft portions of the member, and has a pushing portion that forms a force point with the middle part of the main body as a fulcrum and the connecting claw as an action point. Preferably there is.

In the saw-body lock mechanism including this specific matter, by pushing the push-in portion of the cover member with a finger,
This pushing force is transmitted from the main body of the cover member to each arm via the connecting claws, so that each arm is displaced from a stable posture by both shaft portions to a posture rotating around the shaft portions. To do. As a result, the locking portion of the lock member, which is locked in the locking groove in a posture in which each arm is stable, is disengaged from the locking groove.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A preferred embodiment of the present invention will be described in detail. In addition,
In the following description, the same members as those in the above-described conventional configuration are designated by the same reference numerals, and duplicate description is omitted. FIG.
FIG. 3 is a front view of the folding saw according to the embodiment of the present invention. Referring to the figure, this folding saw
It comprises a handle 1 and a saw body 3 attached to the tip of the handle via a bolt 2. In the following description, the side on which the saw body 3 is attached as viewed from the handle 1 is assumed to be the front side.

The handle 1 has a core material 11 having an inverted U-shaped cross section and defining a sawtooth containing groove 1a, and a core material 1.
1 and a grasping portion 12 coated on the outer peripheral surface except the front portion. The core material 11 is formed of, for example, a relatively hard resin. On the other hand, the grasping portion 12 is made of an elastic material having a higher friction coefficient than the core material 11 (in this specific example, it is made of synthetic rubber, but it may be made of another elastic material such as soft resin). A lock mechanism 16 (see FIG. 2) for mounting the saw blade 3 is attached to the tip of the core 11.

FIG. 2 is an exploded perspective view showing an essential part of the lock mechanism 16 of the folding saw of FIG. 1, and FIG. 3 is a partially cutaway plan view showing an essential part of the lock mechanism 16 of the folding saw of FIG. It is a figure. With reference to these drawings, in the illustrated specific example, the sawtooth containing groove 1 formed at the tip of the core material 11 is described.
a part of which is inserted into the slit 11a continuous with a
1 includes a main body fitting 17, a lock member 20 attached to the main body fitting 17, and a cover member 30 that covers the lock member 20 from above.

The body fitting 17 includes a pair of plate-shaped members 17a formed in the same shape as the tip of the core member 11, and the plate-shaped member 1.
It is a metal member that integrally has a connecting portion 17b having an inverted U-shaped cross section that connects 7a. The plate-shaped member 17a is inserted into the slit 11a to face both sides of the saw body portion, and the bolt 2 is inserted to connect the saw body portion to the tip portion of the core material 11. Also, the connecting portion 17b
Is placed in a recess 11b formed in the upper portion of the core material 11, and is fixed to the projection by a pin 17c while sandwiching a projection (not shown) protruding in the recess 11b.

The lock member 20 is preferably a rod material made of spring steel, and has a locking portion 21 that can be locked in a locking groove 3a formed in the base of the saw body 3, and a locking member. A first arm portion 22 that is continuous to one end portion of the portion 21, a first shaft portion 23 that is continuous to the end portion of the first arm portion 22, and a second arm that is continuous to the other end portion of the bent portion 21. The portion 24 and the second shaft portion 25 that is continuous with the end portion of the second arm portion 24 are integrally provided.

The locking portion 21 is formed by bending a substantially central portion of a bar material, which is a material of the lock member 20, into a U-shape or a U-shape. The locking portion 21 can be configured to be easily locked in the locking groove 3a by setting the thickness of the rod material in advance so that it can be fitted into the locking groove 3a and bending it. The width dimension L1 of the locking portion 21 is set to a sufficient length so that each arm portion 22 and 24 described below does not interfere with the connecting portion 17b. Further, in the illustrated specific example, the locking groove 3b that locks the locking portion 21 when the saw body 3 is in the storage posture.
(See FIG. 4) is provided on the saw body 3, and this locking groove 3b is provided.
By locking the locking portion 21 to the inside, the stored saw body 3 is prevented from accidentally jumping out of the handle 1.

The first and second arm portions 22 and 24 extend in the same direction (rear side of the handle 1) by being bent substantially at right angles to the locking portion 21, respectively. In the illustrated example, the arm portions 22 and 24 are provided with bent portions 22a and 24a at intermediate portions thereof so that the locking portion 21 can be easily locked in the locking groove 3a. further,
In the illustrated example, the first arm 22 is closer to the second arm 2
It is set longer than 4.

A shaft portion 23 formed on each arm portion 22, 24,
25 are bent inwardly and at right angles from the corresponding arm portions 22 and 24. As a result, the shaft portions 23 and 25 are displaced from each other in the front-back direction of the handle 1 while the bolt 2
It extends substantially parallel to and is attached to the end of the handle 1 via the connecting portion 17b of the main body fitting 17. In the illustrated example, only the first shaft portion 23 penetrates both plate members of the connecting portion 17b.

The cover member 30 covers the connecting member 17b of the metal fitting body 17 by covering the lock member 20. FIG. 4 is a vertical cross-sectional view of a main part of which is a cover member 30 used in the lock mechanism 16 of the folding saw of FIG. Referring to FIGS. 2 and 2, the cover member 30 is
A main body 31 that covers the lock member 20 and a connecting claw 32 that connects the arms 22 and 24 of the lock member 20 to the main body 31;
33 and the lock member 2 formed continuously with the main body 31.
It is a resin molded product having a locking portion 21 and push-in portions 34 projecting to the opposite side (rear of the handle 1) from both shaft portions 23 and 25 of 0.

The main body 31 has a U-shaped cross section, and a stepped portion 31a for positioning along the outer contour of the lock member 20 is defined inside the main body 31. Step 31a
Is slidably in contact with the first shaft portion 23 of the lock member 20, and the substantially central portion of the main body portion 31 in the longitudinal direction (direction along the front-back direction of the handle 1) is positioned on the second shaft portion 25. There is. Further, the main body portion 31 is provided with an arcuate protrusion 31b having a rotation center O (see FIG. 3) substantially concentric with the second shaft portion 25 of the lock member 20 so as to protrude downward. The arc-shaped projection 31b is the recess 11 defined by the handle core 11.
It engages with a curved concave portion 11c that is continuous with b, and can be rotated around the rotation center O in the curved concave portion 11c.

The connecting claws 32 and 33 are formed in a protrusion shape that can be locked to the lower surfaces of the corresponding lock member arms 22 and 24, and face each other inward from the inner wall surface of the main body 31, and It projects in the opposite direction. And
The connecting claws 32 and 33 are respectively corresponding arm portions 22 and 24.
Is locked to the lower surface near the locking part. Each of these connecting claws 32 and 33 cooperates with the step portion 31a defined in the inner wall portion of the main body portion 31 to lock the lock member 20 into the main body portion 31.
It is firmly connected to.

The pushing portion 34 constitutes a force point with the middle portion (rotation center O) of the main body portion 31 as a fulcrum and the coupling claws 32 and 33 as action points. The pushing portion 34
Is formed on the opposite side of the locking portion 21 of the main body 31 (on the rear side of the handle 1), and is the center of rotation O of the arc-shaped projection 31b.
Has a predetermined lever length L2. As a result, the pushing portion 34 rotates the connecting claws 32 and 33 around the rotation center O in the clockwise direction in FIG. 4, and the connecting claws 32 and 33 are rotated.
The lock member engaging portion 21 can be operated via the so as to be disengaged from the engaging groove 3a.

In the above structure, the first shaft portion 23 supporting the first arm portion 22 of the lock member 20 and the second shaft portion 25 supporting the second arm portion 24 of the handle 1 are mutually arranged. Since the shaft portions 23, 25 are attached to the end portions of the handle 1 because they are displaced in the front-rear direction,
The forces that try to rotate around 3, 25 are offset, and the lock member 20 stands still in the predetermined posture shown in FIG. Then, in this state, when the saw body 3 in the storage posture (not shown) is displaced to the use posture shown in FIG. 1, as shown in FIG.
The locking portion 21 of the lock member 20 is elastically locked in the locking groove 3a at the base of the saw body 3 to prevent the rotation of the saw body 3. Therefore, in the above-described embodiment, the lock member 20 functions as a locking member that locks in the locking groove 3a at the base of the saw body 3 and a biasing member that biases the locking member in the locking groove 3a. Since the combined function of the two can be achieved, the rotation of the saw blade 3 in use can be prevented by one member, and as a result, the number of parts can be reduced and the cost can be reduced. .

Further, in the above-described embodiment, by pushing the pushing portion 34 of the cover member 30 with a finger, the pushing force F1 causes the connecting claws 32 and 33 to be moved from the main body portion 31 around the rotation center of the arc projection 31b. Through each arm 22, 24
Is transmitted to each of the arm portions 22 and 24,
It rotates in the clockwise direction in FIG. 4 around the rotation center (that is, around the shaft portions 23 and 25) from a stable posture by 25. As a result, the lock member 2 locked in the locking groove 3a in a posture in which the arms 22 and 24 are stable.
The locking portion 21 of 0 comes out of the locking groove 3a.
In this way, when the cover member 30 that covers the lock member 20 is provided so that the locking portion 21 of the lock member 20 can be disengaged from the locking groove 3a through the cover member 30, the appearance is improved. Besides, there is an advantage that the operation of the lock member 20 becomes easier.

The above-described embodiments are merely preferable specific examples of the present invention, and the present invention is not limited to the above-described embodiments. For example, when the core material 11 of the handle 1 is a metal member, the main body fitting 17 can be formed of the same member as the core material, and in that case, the number of parts can be further reduced. . Needless to say, various modifications can be made within the scope of the claims of the present invention.

[0025]

As described above, in the mechanism for locking a saw according to the present invention, the locking member locks the locking portion in the locking groove of the base of the saw and the locking portion in the locking groove. Since it has a function that also functions as an urging member for urging, it is possible to prevent rotation of the saw blade in use by one member, resulting in a reduction in the number of parts and cost. There is a remarkable effect.

In particular, when a cover member for covering the lock member is provided so that the lock portion of the lock member can be disengaged from the lock groove through the cover member, the appearance is improved and the lock member There is an advantage that the operation becomes easier.

[Brief description of drawings]

FIG. 1 is a front view of a folding saw according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part of a lock mechanism of the folding saw of FIG.

3 is a partially cutaway plan view showing a main part of the lock mechanism of the folding saw of FIG. 1. FIG.

4 is a vertical cross-sectional view of a main part of a cover member used in the lock mechanism of the folding saw of FIG.

FIG. 5 is a cross-sectional view showing an example of a conventional sawtooth lock mechanism.

[Explanation of symbols]

 16 Lock Mechanism 20 Lock Member 21 Locking Part 22 First Arm Part 24 Second Arm Part 23 First Shaft Part 25 Second Shaft Part 30 Cover Member 31 Main Body Part 32, 33 Connecting Claw 34 Pushing Part

Claims (2)

[Claims] 1. An end portion of a handle having a sawtooth storage groove and a base portion of the sawtooth are connected by a shaft, and the sawtooth is folded around the shaft and stored in the sawtooth storage groove of the handle. It holds the saw body in a stored position and a use position in which the saw body is extended from the handle so that the saw body can be rotatably displaced, and by engaging with a locking groove formed in the base portion of the saw body, In a saw-toothed lock mechanism in which a lock member for locking movement is attached to a handle end, the lock member includes a locking portion that extends substantially parallel to the shaft and can be locked in a locking groove, and an engaging portion. A first arm portion that is continuous with one end of the stop portion, a first shaft portion that is attached to the handle end portion that is continuous with the end portion of the first arm portion and is substantially parallel to the axis, and the other bending portion A second arm that is continuous with the end and a second arm that is continuous with the end of the second arm The first and second shaft portions are formed of a metal elastic member having a second shaft portion attached to the handle end portion substantially in parallel with the first shaft portion. The attachment mechanism of the shaft portion is arranged such that the engaging portion is urged so as to be engageable with the engaging groove of the saw body portion in use. . 2. The saw body locking mechanism according to claim 1, wherein a main body portion that covers the lock member, a connecting claw that connects each arm portion of the lock member to the main body portion, and a main body portion are formed continuously. The lock member further includes a cover member that protrudes to the side opposite to the locking portion with respect to both shaft portions, and has a pushing portion that forms a force point with the connecting claw as an fulcrum with the middle portion of the main body portion as a fulcrum. There is something.