JP4965215B2 - Wood saw - Google Patents

Description

The present invention relates to a structure of a woodworking saw suitable for producing a trapezoidal notch with a wide back side, for example, which is seen in a certain type of hole in a dovetail.

  There are many types of wood joint structures. For example, the joints called “balance” and “ant” are one of the traditional joint structures, and they are solid and firm as there is no looseness compared to bonding and nailing. Since it has a good finish, it is often adopted as a method for joining plate members at right angles or for storing box corners.

  FIG. 9 shows an example of such a structure. That is, it is formed by a convex plate 8 having projections X arranged at appropriate intervals on the end face, and a concave plate 9 having a trapezoidal cutout Y that expands the back side as a portion for accommodating each projection X. is there. Combined joinery and furniture are made by fitting both plate materials.

The shape of the notch B is trapezoidal. 10 (a) and 10 (b) showing only the concave side plate material 9, when the end side opening of the concave side plate material 9 (the bottom on the short side of the trapezoid) is "balance weighing" It is extremely thin (short) as shown in FIG. 9 (a), and in the case of “anticle insertion”, it is not so much as shown in FIG.

The formation of the notch Y is impossible or almost impossible with a saw alone, and relies on a chisel. For example, as shown in FIG. 11, two rules 91 in the cutout portion Z can be made by sawing, but a saw 92 cannot be used for the rules 92 located on the back side. Therefore, it had to be changed to fleas. This operation is also troublesome and requires skill when the angle θ between the ruled line 91 and the ruled line 92 is an acute angle.

  In view of this point, the inventor of the present invention has finally made the present invention as a result of intensive research, and the feature of the present invention is a saw composed of a handle and a plurality of blade plates, All of the blade plates have the same shape, and the handle is fastened to fix the vicinity of one end of all of the blade plates in a rotatable manner, and to fix each blade plate even in a slightly rotated state. It is in the point which has.

  That is, the present invention is characterized by the fact that a plurality of blades having the same shape are stacked and fixed with a single handle in a saw that is normally composed of a single blade. Moreover, all these blade plates have a fastener that can be rotated with the vicinity of one end thereof as an axis and can be fixed in a state in which each blade plate is slightly rotated.

  Here, the number of blade plates is not particularly limited. However, within the range in which the inventor made a trial experiment, about 10 blade plates were suitable if the blade plate had a thickness of about 0.5 mm. In addition, it is more preferable if a handle structure on the handle side is provided with a margin so that it can be accommodated even if the number of blades is increased or decreased.

  The plurality of blade plates are rotatably attached to the handle around the vicinity of one end thereof. Furthermore, a fastener is provided so that the state can be firmly fixed while being rotated little by little. However, there is no particular limitation on the specific structure for making it rotatable, the specific structure of the fastener for fixing the rotating state, and the like. The rotation angle is not limited by numerical values, but 5 ° or less is sufficient in the case of about 10 blade plates having a thickness of about 0.5 mm stacked. That is, although it rotates, it is not the rotation which expands a fan. Therefore, for example, it is possible to make a notch on the free end side of the blade plate, and insert another member into the notch and twist it.

When using the woodworking saw according to the present invention having such a structure, first, the whole blade plate is shifted slightly and rotated, and the state is fixed with a fastener. At this time, the angle formed by the line connecting the ridges of the plurality of blade plates stacked and the blade plate is close to a right angle in the vicinity of the handle side, and decreases according to the tip. Accordingly, the portion corresponding to the angle of the cutout to be cut ("angle θ" in FIG. 9) only needs to open the blade plate to about 5 °, and then only select an appropriate portion of the blade plate. There is no need to measure and fix in particular. Furthermore, when grinding the saw of the present invention, rather than having all the blades in contact with the wood from the beginning, only one blade touches the wood at the beginning of the grinding, and the adjacent blades contribute to the cutting one after another as they grind. The work type is more workable. Therefore, it is better to adopt a technique in which the cutting operation is started at a position ahead of the blade position corresponding to the accurate angular position, and is finally ended at the accurate angular position. However, the method of using the saw of the present invention is not limited in the present invention.

The woodworking saw according to the present invention is an extremely advanced invention having the following effects.
(1) For example, mortise holes in “balance weighers” and “dosers” that were difficult to cut with a saw alone can be easily and reliably cut with a saw alone.
(2) No special skills are required and cutting work can be done easily.

  Hereinafter, the present invention will be described in more detail.

  FIG. 1 shows an example of a woodworking saw 1 (hereinafter referred to as “present invention saw 1”) according to the present invention. As is clear from the figure, the present saw 1 includes a handle 2 and a blade plate 3. Although it is configured to be connected by screws, it is greatly different from a normal saw in that a large number (10 in the figure) of blade plates 3 are bundled. Since the thickness of the blade plate is about 0.5 mm, the thickness of the blade as an assembly is about 5 mm.

  FIG. 2 shows the shape of the blade plate 3 used in this example. This example blade plate 3 adopts a replaceable blade type structure, and is C-shaped so that it is fixedly integrated with the handle 2 by two screws A and B attached to the handle 2 side. A protruding portion 31 and a circular hole 32 are provided. The inner surface of the C-shaped projecting portion 31 is passed over the screw A, and the screw B is inserted into the circular hole 32 and fixed. The blade plate 3 is slightly shifted during use, but the screw B is the center of rotation, and the blade plate 3 is gradually separated from the screw A. Further, the blade plate 3 of this example has straight portions (a front straight portion 34 and a former straight portion 35) before and after the blade portion 33, and the front straight portion 34 and the former straight portion 35 Are on the same straight line, and the blade portion 33 is formed lower than this height by a slight distance d. Therefore, even if the blade side of the blade plate 3 is applied to a flat surface, the blade portion 33 does not contact the flat surface. However, in the present invention, the use of the blade plate 3 having this structure is preferable but not essential, and a normal blade plate may be used.

  FIG. 3 shows a state in which the blade plate 3 of the inventive saw 1 shown in FIG. 1 is expanded. It can be seen that they are spread out equiangularly. The angle formed by the blade plate surfaces of the plurality of blade plates that have been spread out and a line that connects the ridge lines at right angles is almost right at the hand side, as is clear from the three enlarged views in the figure. The angle is smaller on the side.

FIG. 4A is a partial schematic bottom view showing an example of the form of screws A and B. FIG. In the illustrated state, the blade plate 3 is not spread. As described above, the screw A is tightened in a state where the screw A is fitted into the inner surface of the C-shaped projecting portion 31 of the blade plate 3 to sandwich all the blade plates 3, and the screw B is a circular hole 32 of the blade plate 3. The blade plate 3 is clamped in the same manner as in the state where the blade plate 3 is inserted. In this example, both the screws A and B are tightened using a thumbscrew (bolt type) and screwed into the screw hole provided in the handle 2 main body. You may employ | adopt etc. which were used for performing with other members (for example, coin). In the case of this example, the two bolts are arranged in opposite directions so that the wings of the thumbscrew do not interfere with each other, but this point may be appropriately dealt with.
By the way, in the case of this example constituted by the combination of the screws A and B and the C-shaped projecting portion 31 and the circular hole 32, as shown in FIG. 4B, a blade that rotates about the screw B as an axis. The rotation area of the plate 3 is regulated by the screw A contacting the inner surface of the C-shaped protrusion 31. Therefore, even if all the screws are loosened, the blade plate 3 does not rotate beyond the chain line position in the figure, and has a structure that is easy to handle.

  FIG. 5 shows an example of the usage state of the saw 1 of the present invention, and the portion surrounded by the trapezoidal rules 91 and 92 written on one end of the workpiece wood W is cut by the saw 1 of the present invention. The state which is doing is drawn. The back side of the trapezoid surrounded by the rules 91 and 92 is widened. However, since the blade plates 3 are spread, the blade surface (cutting surface) and the blade plate surface have an acute angle, so that cutting can be performed by sawing to the end. If necessary, the bottom surface portion may be filed. However, in the experiments conducted by the present inventors, the smoothness of the bottom surface is sufficiently secured, and it is considered that in many cases, the file is not actually required.

Up to this point, with each blade plate 3 of the saw 1 of the present invention being opened slightly, the screws A and B are strongly tightened in order to maintain this state, and then a trapezoidal recess having a wider back side is cut. Have explained. However, in the present invention in which the method of use is not limited, it is of course possible to use other methods.
For example, by using a jig and a single-edged saw together, even a novice beginner can perform highly accurate work. 6 (a), 6 (b), and 6 (c) show a state in which such a jig is used, and the wood to be processed W is clamped by the groove bottom jig 4 made of wood that is formed in an L shape. Further, the structure is such that the vise 5 is tightened and held. In the figure, the state in which the blade of the present saw 1 has advanced to the vicinity of the groove bottom jig 4 is depicted. The cutting operation is basically performed while pressing the vicinity of the back end of the blade plate 3 with the palm H as shown in the figure. In addition, the tightening force of the screws A and B is not large in this example. When the blade portion of the blade plate 3 is pressed against the jig or the like while being shifted in the left-right direction, as shown in FIG. The assembly of 3 moves freely.

The work sequence will be described with reference to FIGS. 7 (a), (b), and (c).
First, ruled lines 91 and 92 are preliminarily written on the workpiece wood W based on the design. And this to-be-processed wood W is fixed to the jig | tool shown in FIG. Fixing is performed by aligning the ruled line 92 with the surface height of the groove bottom jig 4, but using a saw using the blade plate 3 shown in FIG. 2 (however, the number of blade plates is one). 2, even when the front straight portion 34 and the original straight portion 35 are in contact with the surface of the groove bottom jig 4, the cutting cannot be performed for the distance d in FIG. 2. The ruled line 92 may be arranged higher by the distance d. Then, as shown in FIG. 5A, the left and right ruled lines 91 and 91 are cut by this single-edged saw (not shown). Subsequently, the cutting lines 93 and 94 are cut. By this cutting, the wooden pieces in the shaded areas (A) and (B) in the figure are cut off. The cutting of the wood pieces (a) and (b) is an operation for facilitating the cutting operation by the saw 1 of the present invention. Further, the cutting lines 93 and 94 may be appropriate, and it is not necessary to make a ruled line in advance, and it is not necessary to be an accurate straight line.

Thus, the saw 1 of the present invention is used for cutting the substantially triangular portion (c) remaining after cutting off the piece of wood. The cutting operation is performed by shifting the blade plate assembly constituting the saw 1 of the present invention as shown in FIG. 6 (b), starting cutting along the left or right ruled line 91 (left side in the figure), and then removing it once. Then, the blade plate assembly is shifted in the opposite direction, and similarly cut along the other ruled line 91.
Then, as shown in FIG. 3C, the necessary cutting portion (d) remains in the vicinity of the center, but this is also cut by the saw 1 of the present invention. In practice, these operations can be performed almost in series, and the jig bottom and other structures do not cut too much on the groove bottom. Therefore, even a very inexperienced person regarding woodwork can proceed with work relatively easily.

Finally, FIG. 8 shows an example in which the present invention saw is constituted by a blade plate 30 which does not have the blade structure of FIG. 2 and has blades engraved on all blade sides. In this example, unlike FIG. 6, there is no groove bottom jig fixed with a vice or the like, and the floating material 41 is arranged before and after the processed wood W. The ruled line 92 of the wood to be processed W fixed to the vice or the like and the upper surface height of the idler 41 are matched. The floating material 41 itself is normal wood having a uniform height, and can freely slide on a horizontal plane. When the cutting operation proceeds with such a jig structure, the blade portion of the blade plate 30 that does not have the front straight portion 34 or the original straight portion 35 as in the blade plate 3 of FIG. The floating material 41 is bitten. However, the cutting work can be performed even if it bites into the floating material 41 that slides freely on the mounting surface, and in the state where it bites into the left and right floating materials 41, the work can be performed in substantially the same manner as in the case of the blade plate 3 of FIG. In addition, even though the blade portion bites into the floating material 41, even if the saw is moved back and forth, the floating material 41 also moves back and forth together with the movement, so that the saw cuts the floating material 41. Absent. Therefore, it is easy to shift the blade plates even when they are bitten.

It is a perspective view which shows an example of the woodworking saw which concerns on this invention. It is a top view which shows an example of the blade board of the woodworking saw which concerns on this invention. It is a top view which shows an example of the state which opened the blade board of the woodworking saw concerning this invention appropriately. (A) is a partial schematic bottom view for clarifying an example of the structure near the screw of the woodworking saw according to the present invention, and (b) is a schematic plan view for explaining the movable range of the blade plate. It is a schematic side view which shows an example of the use condition of the woodworking saw which concerns on this invention. (A) (b) (c) shows another example about the usage method of the woodworking saw which concerns on this invention, (a) is a schematic front view, (b) (c) is a schematic side view It is. (A) (b) (c) is all the side views which show roughly the cutting point of a to-be-processed wood regarding the usage method of the woodworking saw concerning this invention shown in FIG. It is a schematic front view which shows another example about the usage method of the saw for woodwork which concerns on this invention. It is a disassembled perspective view which shows an example of the joint structure of wood. (A) and (b) are both top views which show the example of a relief hole. It is a top view which shows an example of the ruled line of a side hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Woodworking saw according to the present invention 2 Handle 3 Blade plate 30 Blade plate 31 C-shaped projecting portion 32 Circular hole 33 Blade portion 4 Groove bottom jig 41 Free material 5 Vise 8 Convex side plate material 9 Concave side plate material 91 Ruled line 92 Ruled line 93 Cutting line 94 Cutting line A Screw (corresponding to C-shaped protrusion 31)
B screw (for round hole 32)
H Palm W Work wood X Protrusion Y Notch Z Notch part θ Angle formed by ruled line 91 and ruled line 92

Claims (1)

A saw composed of a handle and a plurality of blade plates, all of which have the same shape, and the handle is rotatable about one end portion of all the blade plates as a rotation axis. A woodworking saw characterized by having a fastener for holding and holding each blade plate in a state of being slightly shifted and rotated.

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