JPH0453921Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a folding saw that allows the saw blade to be put in and out of the handle. The present invention relates to a device with a releasable locking function for fixing the device in position.

[Conventional technology]

By the way, as is well known, in a normal folding saw, the saw blade is pivotally attached to the tip of the handle by a single spindle, and the saw blade can be rotated freely in front of the handle by pivoting around the spindle. It can be extended out or folded into the handle.

In such a folding saw, it is necessary to be able to fix the rotatable saw blade at least in a position where it is extended forward of the handle, and in addition, it is also necessary to be able to fix it in a position where it is folded into the handle. desirable.

The following are known as prior art techniques that enable such fixing. First of all, in Utility Model Application Publication No. 1916 of 1972, a retaining ring pivoted near the upper tip of the handle,
A technique has been disclosed in which the saw blade can be fixed in the above-mentioned position by locking the saw blade near the rear end of the back of the handle and pulling it backward. However, in this prior art, when fixing the saw blade, the action of locking the retaining ring and the action of pulling it backward are required, and when releasing the fixation, the opposite actions are required, so each operation takes time and effort. However, the disadvantage of having the saw blade folded into the handle is that it cannot be fixed.

As for the second prior art, in Utility Model Application Publication No. 16162 of 1981, a locking shaft provided near the spindle, which is the center of rotation of the saw blade, is extended forward of the handle. Alternatively, it has been disclosed that the saw blade can be fixed in any of the above-mentioned positions by engaging with the notch at the rear end of the saw blade that is folded into the handle. There is. However, this prior art has the disadvantage that it is surprisingly difficult to rotate the lock shaft when fixing and releasing the saw blade, and it is uncertain whether the saw blade is fixed or not.

[Problem that the invention attempts to solve]

SUMMARY OF THE INVENTION The present invention seeks to provide an improved saw blade locking device to overcome the above-mentioned problems with the prior art folding saws. That is, the purpose of the present invention is to make it possible to fix the saw blade in either the position extended to the front of the handle or the position folded into the inside of the handle, and to facilitate the operations required for fixing and releasing the fixing. The purpose is to make it easier to determine whether or not it has been fixed.

[Means for solving problems]

The technical means of the present invention necessary to achieve the above object are shown in FIGS. 1 to 8, which correspond to embodiments thereof.

First, the folding saw to which the present invention is directed has a saw blade storage space 1a that is open downward and extends over its entire length, and has a handle 1 whose tip is split in half by the space 1a, and teeth 2a on one side. Saw blade 2 formed with
It is composed of. The rear end portion of the saw blade 2 is pivotally attached to the handle 1 by a support shaft 3 in a state where it is inserted into the tip end portion of the handle.
Therefore, the saw blade 2 rotates around its support shaft 3,
It is freely pivotable between a position in which the handle 1 is extended forward and a position in which the teeth 2a face inward and are folded into the saw blade storage space 1a of the handle 1.

Inside the tip of the handle 1 of such a folding saw, there is a lock plate 4 located diagonally above the rear of the support shaft 3 and having a locking pawl 4a at the front end, and the lock plate 4 is fixed in position with respect to the handle 1 and is fixed to the above-mentioned position. It is pivotally connected by a first pin 5 parallel to the support shaft 3 so as to be rotatable in the front-back direction. On the other hand, on the periphery of the rear end portion of the saw blade 2, there are locking recesses corresponding to the locking claws 4a at two locations that respectively face the locking claws 4a when the saw blade assumes each of the above-mentioned positions. 2b and 2c are provided respectively.

On the other hand, there is a storage recess 6 in the lengthwise direction of the handle at the upper part near the tip of the handle 1, and a handhold 7 at the rear end.
An operating lever 7 having a handle is housed therein. This operating lever 7 has a second pin 8 at its front end that is movable in position with respect to the handle 1 and is parallel to the spindle 3.
It is pivotally attached to the upper end of the lock plate 4 and can be freely pulled upward from the storage recess 6.

Further, in the middle of this operating lever 7, a rear end 9b is provided.
The front end 9a of the auxiliary link 9 is pivotally supported on the handle 1.

However, the front end 9a of the above-mentioned auxiliary link 9
When the operating lever 7 is housed in the storage recess 6, the position is slightly below the imaginary line A-A connecting the rear end 9b of the link and the second pin 8; When the operating lever 7 is raised, it is set to move above the virtual line A-A.

In addition, the second
The distance from the pin 8 to the front end 9a of the auxiliary link 9 and the distance from the front end 9a to the rear end 9b of the link are such that when the operating lever 7 is stored in the storage recess 6, the lever is The locking plate 4 is rotated forward, and the locking pawl 4a of the plate is inserted into each of the locking recesses 2b, 2b, and 4b at the two peripheral edges of the rear end of the saw blade.
2c, respectively.

[Effect]

In the saw blade locking device of the folding saw configured as described above, the saw blade is fixed in the position extended to the front of the handle and the position folded into the handle, and the locking is released as follows. will be carried out.

First, as shown in FIGS. 1 and 2, it is assumed that the saw blade 2 is now extended to the front of the handle 1 and the operating lever 7 is housed in the storage recess 6. Then, the operating lever 7 at this time pushes the locking plate 4 forward through the second pin 8, and the locking pawl 4a of the plate is inserted into one of the locking recesses in the rear end portion of the saw blade 2. 2b, and the lever itself is maintained so that the front end 9a of the auxiliary link 9 is slightly below the imaginary line A-A connecting the rear end 9b of the link and the second pin 8. Therefore, it is maintained in a state where it is accommodated in the storage recess 6. Therefore, the saw blade 2 is fixed in a position extended forward of the handle 1, and does not rotate about the support shaft 3.

Therefore, the operating lever 7 is pulled upward from the storage space 6 using the second pin 8 as a fulcrum, as shown by the chain line in FIG. 1 and by the solid line in FIG. Then, the auxiliary link 9 rotates upward about the rear end 9b, moves its front end 9a above the imaginary line A-A, and reduces the straight line distance from the second pin 8 to the rear end 9b. try to reduce it. Therefore, the second pin 8 is moved rearward as the operating lever 7 is pulled, and is pulled back so as to rotate the lock plate 4 rearward, and the locking pawl 4a of the plate is moved into the locking recess of the saw blade 2. Remove from location 2b. Accordingly, the saw blade 2 is released from being fixed in the forwardly extending position of the handle, and can be pivoted about the spindle 3 in the direction of being folded into the handle 1.

Next, the saw blade 2 is rotated around the spindle 3, and the first
As shown by the chain line in the figure and the solid line in Fig. 4, the tooth 2
After folding the handle 1 into the saw blade storage space 1a with the end a facing inward, the operating lever 7 is inserted into the second pin 8.
Rotate it around the fulcrum and push it down into the storage recess 6. Then, the auxiliary link 9 rotates downward using the rear end 9b as a fulcrum, and attempts to increase the straight-line distance from the second pin 8 to the rear end 9b. Therefore, as the operating lever 9 is pushed down, the second pin 8 is moved forward and pushes the locking plate 4 forward to rotate the locking pawl 4a of the plate to the other locking position of the saw blade 2. Engage with the stopper recess 2c. In addition, the above auxiliary link 9
The front end 9a of the saw blade will eventually move slightly downward from the imaginary line A-A, similar to when the saw blade is fixed in the extended position, and the operating lever 7 will be placed in the storage recess 6. keep it. Therefore, the saw blade 2 is fixed in the folded position into the handle 1 and does not rotate about the support shaft 3.

In addition, fixing the saw blade in this folded position,
Similarly to the above-mentioned release of fixation in the extended position, it is released by pulling up the operating lever 7.

〔Example〕

Next, some specific embodiments of the present invention will be described with reference to the drawings. However, since the basic configuration of each of these embodiments overlaps with the configuration of the above-mentioned invention, repeated explanation will be omitted.

First of all, in the explanation so far, the saw blade 2 and the lock plate 4 are directly pivoted to the handle 1 by the support shaft 3 or the first pin 5, and the rear end 9a of the auxiliary link 9 is also attached to the handle. It was expressed as if it were directly supported by. However, when the construction is as described above, there is a risk of problems in terms of durability unless the material of the handle 1 itself has considerable strength, and the assembly of the entire saw is difficult. It becomes a bit troublesome.

Therefore, in the illustrated embodiment, a reinforcing frame 10 consisting of left and right side parts 10a, 10b and a top part 10c spanning between the front upper edges of each side part is fitted into the tip of the handle 1 which is divided into two parts. The saw blade 2 and the locking plate 4 are integrated into the handle 1 by the support shaft 3 and the knock pin 11, which pass through the front and back of the frame, respectively, and the rear end portion of the saw blade 2 and the lock plate 4 are attached to the left and right sides of the reinforcing frame. Saw blade 2 interposed between both side parts 10a and 10b when the top part 10c of the frame is extended forward of the handle 1
The first pin 5, which serves as a stopper for the frame and pivots the lock plate 4, is attached to the left and right sides 10a of the reinforcing frame,
10b, and the rear end of the auxiliary link 9 is pivotally supported near the rear ends of both left and right sides 10a and 10b of the frame. Therefore, according to this embodiment, the tip of the handle 1 is reinforced by the reinforcing frame 10, so even if the material of the handle is not particularly strong, problems arise in terms of durability. Furthermore, since the lock plate 4, operating lever 7 and auxiliary link 9 can be attached to the reinforcing frame 10 together with the reinforcing frame 10 in advance, assembly of the entire saw becomes easy.

Further, according to the above description, when pushing down or pulling up the operating lever 7 when fixing or releasing the saw blade 2, the front end 9a of the auxiliary link 9
crosses the imaginary line A-A below or above, but at this time, the link temporarily undergoes elastic deformation that slightly shortens the length in the linear direction between the front and rear ends. Although such elastic deformation does not particularly interfere with the operation of the operating lever 9, it is preferable to cause it to occur softly so as to cause as little resistance as possible.

Therefore, in the illustrated embodiment, the section from the front end 9a to the rear end 9b of the auxiliary link 9 is curved, for example, downward with respect to the vertical direction. According to such an embodiment, the above-mentioned elastic deformation can be caused more elastically and softly than when the front and rear ends of the auxiliary link 9 have a straight line shape, and therefore the operation of the operating lever 7 can be made easier. It becomes even easier.

[Effect of idea]

According to the present invention as described above, the saw blade of a folding saw can be reliably fixed not only in the position where it is extended forward of the handle, but also in the position where it is folded into the inside of the handle. Fixing and unfixing in each position can be achieved by simply pushing down or raising one operating lever, making the operation extremely easy.Furthermore, the position of the operating lever can be used to determine whether the saw blade is fixed or not. It can be easily determined by
You can expect similar effects.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the embodiment of the present invention when the saw blade is in a position where it is extended forward from the handle, Fig. 2 is a partially cutaway enlarged side view of the main parts in Fig. 1, and Fig. 3 The figure is a partially cutaway enlarged side view of the saw blade in a state where the fixation is released, and FIG. 4 is a partially cutaway enlarged side view of the saw blade folded into the handle. Figure 5 is a cross-sectional view taken along line A-A in Figure 2, Figure 6 is a cross-sectional view taken along line B-B, Figure 7 is a cross-sectional view taken along line C-C, and Figure 8 is a cross-sectional view taken along line C-C. The figure is also a sectional view taken along the line DD. 1... Handle, 1a... Saw blade storage space, 2... Saw blade, 2a... Teeth, 2b, 2c... Locking recess, 3...
...Spindle, 4...Lock plate, 4a...Latching claw, 5...
...First pin, 6... Storage recess, 7... Operating lever, 7a... Handhold, 8... Second pin, 9...
Auxiliary link, 9a...front end, 9b...rear end, 10
... Reinforcement frame, 10a, 10b ... Left and right sides, 1
0c...Tenbu, 11...Notsukupin.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The saw blade and handle are pivotally connected to each other by a spindle while the rear end of the saw blade is inserted into the two-split tip of the handle. In a folding saw in which the saw blade is said to be able to freely rotate around this spindle between a position where it is extended forward of the handle and a position where it is folded into the inside of the handle, the tip of the handle is A locking plate having a locking pawl at the front end is provided diagonally above the rear of the spindle inside, and this locking plate is fixed in position with respect to the handle by a first pin parallel to the spindle. It is pivotally mounted so that it can freely rotate in the front-back direction, and when the saw blade assumes each of the above-mentioned positions on the periphery of the rear end of the saw blade, there are two positions opposite to the above-mentioned locking pawls. There are locking recesses that correspond to the claws, and there is a storage recess in the lengthwise direction of the handle at the top near the tip of the handle, and an operating lever with a handhold is housed at the rear end. The lever is pivotally connected to the upper end of the lock plate by a second pin whose front end is movable relative to the handle and is parallel to the spindle, so that the lever can be freely pulled upward from the storage recess. The front end of an auxiliary link whose rear end is pivoted to the handle is pivoted in the middle of this operating lever, and the front end position of the auxiliary link is such that the operating lever is in the storage recess. It is set so that when the link is stored in the housing, it is slightly below the imaginary line connecting the rear end of the link and the second pin, and when the operating lever is pulled up, it moves above the imaginary line. In addition, the distance from the second pin of the operating lever to the front end of the auxiliary link and the distance from the front end to the rear end of the link are the same when the operating lever is placed in the storage recess. The lever rotates the locking plate forward so that the locking pawl of the plate locks into one of the two locking recesses on the periphery of the rear end portion of the saw blade. A saw blade locking device for a folding saw, characterized in that: (2) A reinforcing frame consisting of left and right sides and a top that spans between the front upper edges of each side is fitted into the two-part tip of the handle and integrated with the handle. The rear end of the saw blade and the locking plate are interposed between the left and right sides of the reinforcing frame,
The top of the frame serves as a stop for the saw blade when the handle is extended forward, and a support shaft to which the rear end of the saw blade is pivotally attached, and a first part to which the lock plate is pivotally attached.
The pins pass through both left and right sides of the reinforcing frame, and the rear ends of the auxiliary links are pivotally supported at the rear ends of the left and right sides of the frame. A saw blade locking device for a folding saw described in Scope 1. (3) The saw blade locking device for a folding saw as set forth in claim 1, wherein the auxiliary link is curved in the vertical direction from the front end to the rear end.