JPH0213121Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a folding saw in which a saw blade connected to the tip of the handle can be taken out from the handle when in use and folded into the handle when not in use. In particular, the present invention relates to a folding saw whose saw blade can be replaced.

[Conventional technology]

In a folding saw, the rear end of the saw blade is connected to the tip of the handle via a spindle, and the saw blade can be freely rotated from a storage position in which the saw blade is folded into the handle to a usage position in which it is taken out from the handle. When the saw blade is taken out for use, it is necessary to fix the saw blade in that position so that it cannot be rotated. Therefore, this type of folding saw is provided with a locking mechanism for fixing the saw blade in the operating position, as shown in, for example, Japanese Utility Model Publication No. 1916/1983, but this locking mechanism is located at the tip of the handle. The saw blade is locked by hooking a pivoted retaining ring near the back end of the saw blade taken out from the handle and pulling it toward the rear end of the handle, the retaining ring being attached to the saw blade. Not only is the attachment/detachment operation troublesome, but the retaining ring or its entire operating member is always exposed outside the handle, which poses a problem in carrying.

Furthermore, in this type of folding saw, the saw blade is only able to pivot freely relative to the handle between the storage position and the usage position, and the saw blade cannot be separated from the handle. The blade usually has teeth on only one side, so if you want to cut wood in the straight-grain direction and the board-grain direction, for example, you must prepare multiple saws with different teeth. This is an inconvenience.

For example, as shown in Japanese Utility Model Publication No. 59-25602, a so-called split saw in which a plurality of saw blades can be freely replaced with one handle is known.
This saw does not allow the saw blade to be folded into the handle.

[Problem that the invention attempts to solve]

As mentioned above, for conventional folding saws,
The locking mechanism that secures the saw blade in the operating position is troublesome to operate, and the operating member hinders portability.In addition, it is difficult to separate the saw blade from the handle and replace it with a different type of saw blade. There was an inconvenience in that it could not be used for a wide range of purposes when replaced.

SUMMARY OF THE INVENTION Therefore, the present invention aims to realize a folding saw in which the operation of fixing the saw blade to the handle in a ready-to-use position is easy, the operating member does not get in the way when carrying the saw, and the saw blade can be replaced. With the goal.

[Problem and means to solve it]

The folding saw according to the present invention is characterized by being configured as follows in order to solve the above problems.

That is, a folding saw in which the tip of the handle and the rear end of the saw blade are connected via a support shaft so that the saw blade can freely pivot from a storage position in which it is folded into the handle to a usage position in which it is taken out of the handle. A bending link mechanism is installed in the distal end of the handle in which one end of the first link and the second link are bendably connected via a connecting pin, and the link mechanism is used from the storage position of the saw blade. The other ends of each of the first and second links are connected to a predetermined position of the handle and the saw blade on one side with respect to the center of rotation at the rear end so that it operates from a bent state to an extended state in response to turning to the stance. are connected to the offset position via a fulcrum pin and an eccentric pin, respectively. Then, when the saw blade is swiveled to its use position, bending of the link mechanism from the extended state to the side opposite to the buckling direction is restricted at a position where the connecting pin slightly exceeds the straight line connecting the fulcrum pin and the eccentric pin. With stoppa,
A portion of the link mechanism is exposed outside the handle, and by pushing the connecting pin beyond the above-mentioned straight line, the link mechanism is prevented from bending, and by pushing the connecting pin back from the position beyond the above-mentioned straight line to the opposite side, the link mechanism is An operating member is provided that enables bending motion. Further, the handle is provided with a cover for opening and closing the interior part of the bending link mechanism, and the saw blade is attached to the support shaft so that the saw blade can be removed from the handle and the bending link mechanism with the cover open. and can be attached to and detached from the eccentric pin.

[Effect]

According to the above configuration, when the saw blade is taken out from the handle and swiveled to the use position, if the operating member, which is partially exposed outside the handle, is pressed in one direction, the handle and the rear end of the saw blade are By preventing the bending movement of the bending link mechanism provided across the two, the saw blade is locked in the above-mentioned usage position, and if the operating member is pressed in the opposite direction in this state, the bending mechanism will be prevented. The link mechanism becomes capable of bending motion and the saw blade can be pivoted to the storage position. In this manner, it is possible to lock or unlock the saw blade in the operating position by an extremely simple operation of the operating member, a portion of which is exposed outside the handle. Particularly, according to the above configuration, by opening the cover provided on the handle and opening the interior part of the link mechanism, the saw blade can be separated from the spindle and the eccentric pin in the link mechanism. This makes it possible to replace the saw blade with a different type of saw blade if necessary.

〔Example〕

Embodiments of the present invention shown in the figures will be described below.

In Figures 1 to 5, 1 is the handle of a folding saw, 2
is a saw blade that is connected to the tip of the handle 1 via a support shaft 3 and has teeth 2a formed on its ventral side over approximately the entire length; It is pivotable between a usage position in which the center extends substantially in a straight line with respect to the handle 1 shown in FIG. In the illustrated example, the teeth 2a are housed in a slit 1a provided on the ventral side of the handle 1, except for the middle portion. In addition, in the usage position, the notch 2b provided on the back side of the rear end of the saw blade 2 engages with the stopper pin 4 provided on the back side of the tip end of the handle 1, so that the saw blade 2 can be used beyond this usage position. The saw blade 2 is prevented from rotating in the opening direction.

Reference numeral 5 denotes a bending link mechanism housed in a hollow portion 1b provided at the tip of the handle 1, and the link mechanism 5 bends one end of a first link 6 and a second link 7 via a connecting pin 8. The other end of the first link 6 is pivotally connected to the handle via a fulcrum pin 9 at a predetermined rear position within the hollow portion 1b, and the other end of the second link 7 is connected freely. The saw blade 2 is connected to the rear end portion of the saw blade 2 via an eccentric pin 10 at a position offset toward the ventral side from the pivot point by the support shaft 3 . As a result, the link mechanism 5 changes from a bent state in which the first and second links 6 and 7 are bent to a substantially straight line state in conjunction with the rotation of the saw blade 2 from the storage position to the use position. It is designed to operate in a stretched state similar to that of . Here, the second link 7 is made of an elastic material and has a curved shape, so that the dimension between the connecting pin 8 at one end and the eccentric pin 10 at the other end may change slightly due to elastic deformation. It is being done. 11 is the first link mechanism 5
A lock operation part 12 is provided protruding from the end of the link 6 on the connecting pin 8 side toward the ventral side of the handle 1, and 12 is also provided on the back side of the handle 1 from the end of the first link 6 on the connecting pin 8 side. The distal end portions of both operating portions 11 and 12 are exposed on the ventral side and the dorsal side of the handle 1, respectively. Then, when the saw blade 2 is turned to the operating position and the first and second links 6 and 7 are aligned substantially in a straight line, the locking operation part 11 on the ventral side is pushed into the handle 1, as shown in FIG. As shown in FIG. 2, a connecting pin 8 connecting the first and second links 6 and 7 is pushed inward beyond the straight line X connecting the fulcrum pin 9 and the eccentric pin 10. At this time, the back side of the second link 7 comes into contact with the boss portion 1c of the support shaft 3 that connects the handle 1 and the saw blade 2, so that the connecting pin 8 moves to the first The second links 6 and 7 are prevented from bending in the direction opposite to the bending direction. Further, when the connecting pin 8 crosses the straight line X, the second link 7 is slightly compressed, and at the point when the connecting pin 8 crosses the straight line Unless this is done, the connecting pin 8 will be held at a position slightly beyond the above-mentioned straight line X, making the bending operation impossible. In this state, if the lock release operation part 12 exposed on the back side of the handle 1 is pushed inward, the connecting pin 8
is pushed back to the opposite side beyond the straight line X, allowing the link mechanism to bend.

However, one side of the hollow portion 1b in which the bending link mechanism 5 is housed at the tip of the handle 1 is open, and a cover 13 is provided to close the hollow portion 1b.
is provided. This cover 13 is pivotally attached to the tip of the handle 1 via the stopper pin 4 that prevents the saw blade 2 from rotating in the opening direction in a predetermined usage position.
As shown in FIG. 6, when the cover 13 is rotated upward, the hollow portion 1b is opened. Further, a support shaft 3 that connects the handle 1 and the saw blade 2, and an eccentric pin 10 that connects the second link 7 of the bent link mechanism 5 and the saw blade 2 are provided at the rear end of the saw blade 2. The saw blade 2 is inserted into the center hole 2c and the eccentric hole 2d, respectively, and when the cover 13 is opened as shown in FIG. 2 to pattern 1
It is now possible to separate it from

According to the above structure, when the folding saw is used, the saw blade 2 is taken out from the handle 1 and rotated to the usage position shown in FIG. When pushed in, the bending motion of the bending link mechanism 5, which is in an extended state in conjunction with the rotation of the saw blade 2, becomes impossible, and the link mechanism 5 prevents the saw blade 2 from turning from the operating position to the closing direction. This causes the saw blade 2 to be blocked.
will be locked in a state of use. Furthermore, when folding the saw blade 2 into the handle 1 after using the saw, pushing in the lock release operation part 12 exposed on the back side of the handle 1 enables the link mechanism 5 to bend. Therefore, the saw blade 2 can be turned in the closing direction, thereby making it possible to store the saw blade 2 in the handle 1. In this way, saw blade 2
Locking and unlocking in the usage position can be performed by simply pressing the operating parts 11 and 12, and the tips of the operating parts 11 and 12 are exposed on the ventral and dorsal sides of the handle 1. Therefore, these operation parts 11 and 12 do not get in the way when the saw is carried around.

Further, according to the above structure, the saw blade 2 can be separated from the handle 1 by opening the cover 13 (FIG. 6) that closes the interior part of the link mechanism 5 at the tip of the handle 1. , it becomes possible to replace the saw blade 2 with another saw blade with a different tooth shape. Therefore, by preparing a plurality of types of saw blades, it becomes possible to select and use a saw blade having optimal teeth depending on the type and properties of the material to be cut.

In the illustrated example, when the saw blade 2 is folded against the handle 1 in the storage position (the state shown in Fig. 2), both the front and rear ends of the teeth 2a excluding the middle part of the saw blade are aligned with the belly of the handle. It is stored in the slit 1a provided on the side, but like a normal folding saw of this type,
By forming the slit 1a along the entire length of the ventral side of the handle, the entire length of the tooth 2a can be accommodated, or from the middle part of the tooth to the tip without providing the slit 1a at the rear end of the handle 1. The portion may be brought into contact with the ventral outer surface of the handle 1.
In addition, in the illustrated example, as described above, the saw blade 2 is rotated to the usage position relative to the handle 1, and the connecting pin 8 that connects the first and second links 6 and 7 connects the fulcrum pin 9 and the eccentric pin 10. When the link is pushed slightly inward beyond straight line
However, this stopper does not use the boss portion 1c, and as shown by the chain line 1d in FIG. There is no problem even if it is provided in an inner position.

[Effect of idea]

As described above, according to the present invention, in a folding saw in which the saw blade can be swiveled between a usage position in which the saw blade is taken out from the handle and a storage position in which it is folded into the handle, the locking operation and the release of the saw blade in the usage position are performed. The operations are facilitated, the members for performing these operations are prevented from getting in the way when carrying the saw, and the saw blade can be replaced. This makes it possible to realize a folding saw of this type that is convenient to use and carry, and has a wide range of uses.

[Brief explanation of the drawing]

The drawings show an embodiment of the folding saw of the present invention. Fig. 1 is a partially cutaway side view of the saw blade set in its use position, and Fig. 2 is a partially cutaway side view of the saw blade set in its storage position. A broken side view, Figure 3 is a bottom view of the main part in Figure 1, Figures 4 and 5 are lines A-A and B in Figure 1.
6 is a sectional view taken along the line -B, and a side view showing the state when the saw blade is replaced. 1...Handle, 1c...Stopper (boss part), 2...
...Saw blade, 3... Support shaft, 5... Hip bending link mechanism,
6... First link, 7... Second link, 8... Connection pin, 9... Fulcrum pin, 10... Eccentric pin, 1
1, 12... Operating member (11... Locking operating section, 12... Lock release operating section).

Claims (1)

[Scope of utility model registration request] A foldable saw blade in which the tip of the handle and the rear end of the saw blade are connected via a spindle, and the saw blade can freely pivot from a storage position in which it is folded into the handle to a usage position in which it is taken out of the handle. It is a saw, and the tip of the handle has a first
A bending link mechanism is provided in which the link and the second link are bendably connected via a connecting pin, and the link mechanism extends from the bending state in response to the rotation of the saw blade from the storage position to the usage position. The other end of the first link is located at a predetermined position on the handle, and the other end of the second link is located at a position offset to one side with respect to the pivot center of the saw blade, so that the fulcrum pin and A stopper is provided that connects the link mechanism via an eccentric pin and restricts the bending of the link mechanism from the extended state to the side opposite to the bending direction at a position where the connecting pin slightly exceeds the straight line connecting the fulcrum pin and the eccentric pin. The part is exposed outside the handle, and the link mechanism is prevented from bending by pushing the connecting pin beyond the above-mentioned straight line, and by pushing the connecting pin back to the opposite side from the position beyond the above-mentioned straight line to prevent the link mechanism from bending. An operating member is provided to enable
However, the handle is provided with a cover for opening and closing the interior part of the bending link mechanism, and the saw blade is attached to the spindle and the eccentric pin so that the saw blade can be removed from the handle and the bending link mechanism with the cover open. A folding saw characterized by being able to be attached to and detached from the folding saw.