JPH0444881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a replaceable blade plane whose blades can be replaced and made disposable.

[Conventional technology]

The inventor of the present application disclosed a replaceable blade plane as shown in FIG. 2 in Japanese Patent Application No. 60-245700. This conventional replaceable blade type plane is designed so that a replaceable blade 2 made of a substantially rectangular thin steel plate fits exactly into the blade 1 of a normal flat plane.
Along the cutting edge of the plane blade 1, a shallow stepped notch 3 having a depth approximately the same as the thickness of the replaceable blade 2 is provided, and two protrusions are provided on the top surface of the notch 3. is provided with a through hole or notch into which the protrusion fits, and the replacement blade 2 is fitted into the notch 3 of the plane blade 1 to form an integral unit, and the back metal 6 is placed on the plane body 1 to hold down the plane stand 7. Groove 8
It is fitted with

[Problem that the invention seeks to solve]

The above-mentioned conventional plane with replaceable blades can be used in the same way as a normal flat plane, but in order to obtain a beautiful cutting surface with no back marks, the position of the backing metal 6 must be finely adjusted in the same way as with a normal plane. There is a need to. The back metal of the plane must fix the plane blade to the plane stand, and the tip of the back metal must be set back 0.1 to 3 mm from the cutting edge of the plane blade, so that the edge of the back metal is parallel to the blade edge of the plane.

Adjusting the tip position of this backing metal greatly affects the finish of the cut surface. The smaller the amount of retraction at the tip of the back metal, the more effective it is at preventing cross-grain, and in order to obtain the most beautiful finished surface, the amount of retraction should be approximately 0.1 to 0.2 mm.
Also, the tip edge of the back metal must be parallel to the cutting edge of the plane blade. In the case of rough cutting, the backing metal should be set back 1 to 3 mm in order to increase the cutting amount.

In this way, it is necessary to finely adjust the position of the backing metal depending on the purpose of cutting, but especially when cutting is for finishing, this adjustment is difficult even for professional carpenters, takes time, and requires skill. It is even said that the skill of a carpenter is determined by the skill of the carpenter. Moreover, it is impossible for an amateur to make this perfect adjustment, and even if you use a replaceable blade with the same sharpness as a plane sharpened by an expert craftsman, it is difficult to obtain a beautifully finished cut surface. It was hot.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a replaceable blade plane that allows the position of the tip of the back metal to be easily adjusted.

[Means for solving problems]

As a result of intensive research by the present inventors to solve the above problems, the tip of the backing metal was made into a replaceable blade type, and there were two blades, one for cutting and the other for preventing backlash, with slightly different lengths. By stacking two replacement blades so that they face each other and fitting these two replacement blades into a plane blade that has a notch that allows the two replacement blades to fit together,
You can always fix the tip of the spare blade to prevent backing by a certain distance from the tip of the cutting blade, and by replacing it with a spare blade of a different size, you can easily adjust the cutting edge of the back metal. The present invention was completed by discovering that the amount of retraction can be arbitrarily adjusted.

That is, the present invention relates to a known flat plane consisting of a planer stand made of wood or the like, a plane blade that fits into a holding groove provided in the planer stand, and a back metal overlaid on the plane blade. Make sure that the two replacement blades, the replacement blade for use and the replacement blade for preventing reverse stitches, fit together exactly on top of each other.
In addition to providing a shallow stepped notch with a depth that is approximately the same as the total thickness of the two replaceable blades, both the cutting replaceable blade and the reverse cut prevention replaceable blade are single-edged, and the rear of the replaceable blade is A difference is made so that the length from the end to the cutting edge is 0.1 to 3 mm longer for the cutting blade than for the blade for preventing reverse marks, and two or more protrusions are provided on the top surface of the notch, and The spare blade for cutting and the spare blade for preventing backlash are provided with a through hole or notch into which the protrusion fits, and the flat sides of the single blades of the spare blade for cutting and the spare blade for preventing backshot are brought into close contact with each other. , overlap the two spare blades so that their rear end positions match each other and fit into the notch of the plane blade to make the plane blade and the two spare blades into one body, and overlap this with the back metal. The object of the present invention is to provide a replaceable blade type planer, which is characterized by being fitted into the holding groove.

Next, the contents of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a sectional view of the replaceable blade plane of the present invention, and FIG. 3 is a plan view thereof. 7 is a planer stand made of wood, etc.
It is almost the same as the planer stand of a traditional flat plane. Reference numeral 1 denotes a plane blade, and the upper surface along the cutting edge is exactly aligned with two spare blades, a cutting blade 9 and a back-grain prevention blade 10, each made of a steel plate with a thickness of 0.8 to 1.5 mm. A notch 3 is formed by cutting out a shallow step-like shape to a depth that allows for fitting. The width of the notch portion 3 shall be the entire width of the plane blade 1, and the depth l of the notch portion 3 shall be the width when the rear end 11 of the cutting blade 9 is brought into contact with the upper end surface 12 of the notch portion 3. , the blade edge 13 of the cutting blade 9 is formed so as to just protrude from the blade edge portion of the plane blade 1.

Protrusions 4 are provided at two locations on the upper surface 14 of the notch portion 3, and notches 5 or through holes are provided in the cutting blade 9 and the reverse cut prevention blade 10 at exactly the positions where these projections 4 fit. .

Both the cutting blade 9 and the back-grain prevention blade 10 are single-edged (however, in this specification, the word "single-edged" is used to mean "a blade whose one side is ground diagonally and the other side is flat". ), but the length from the rear end 11 to the cutting edge 13 of the blade for preventing backlash 10 is formed to be 0.1 to 3 mm shorter than that of the blade. As a result, when these two replaceable blades are fitted into the notch 3 of the plane blade 1 with their rear ends 11 aligned and the flat sides of the single blades in close contact with each other, the replaceable blade 10 The blade edge 13' of the cutting blade 9 is installed so that it is always at a certain position 0.1 to 3 mm back from the blade edge 13 of the cutting blade 9.

The replaceable cutting blade 9 and the replaceable blade 10 for preventing reverse stitches may have the same thickness or may have different thicknesses.

The cutting edge angle α of the cutting blade 9 is preferably 27 to 30 degrees for good sharpness. Setting the blade edge angle β of the replaceable blade 10 to 60 to 80 degrees is most effective in preventing back stitches. If this angle is too small, the effect of preventing cross-cutting will be small, and if it is too large, the smooth discharge of planer chips will not be possible. Furthermore, in order to smoothly discharge the shavings, the 9th
As shown in the enlarged cross-sectional view of the figure, a spare blade 10 for preventing backlash
Only 0.1 to 0.3 mm of the cutting edge should have a cutting edge angle β of 60 to 80 degrees, and the angle γ of the part behind it should be 20 degrees.
It is preferable to reduce it to ~30 degrees.

FIGS. 10 and 11 show another embodiment of the plane blade 1 used in the replaceable blade type plane of the present invention, in which the position of the protrusion 4 is changed, respectively. In the case of FIG. 11, since the protrusion 4 is located in the middle of the upper surface 14 of the notch 3, a through hole 15 is provided in place of the notch 5 in the cutting replaceable blade 9 and the reverse cut prevention blade 10.

FIG. 12 shows the upper end surface 12 of the cutout part 3 of the plane blade 1 formed at an acute angle of 45 to 60 degrees with respect to the upper surface 14, and the cutting blade 9 that comes into contact with this upper end surface 12 and the cutter blade 9 that contacts the upper end surface 12. An embodiment is shown in which the angle of the rear end surface of the blade 10 is also made to match this angle. In this case, the above-mentioned cutting blade 9
The length from the rear end of the replaceable blade 10 to the blade edge 13 is the length from the rear end to the blade edge of the mutually contacting surfaces of the replaceable blades. As shown in Figure 12, the plane body 1
If a replaceable blade is formed, the rear end of the replaceable blade is held down by the upper end surface 12 of the notch 3 formed in an acute angle, so vibration is less likely to occur between the plane blade 1 and the replaceable blade during cutting work. There is no possibility that this vibration will interfere with cutting work.

[Effect]

If the difference in length from the rear end 11 of the cutting blade 9 and the cutting blade 10 from the rear end 11 to the cutting edge 13 is the retraction amount d, then the single-edged flat sides of the dual blades are brought into close contact with each other to cut into the notch part of the plane blade 1. When attached to 3, the spare blade for preventing back-eye 10
The cutting edge 13' is mounted at a position recessed from the cutting edge 13 of the cutting blade 9 by a retraction amount d. If you prepare several types of spare blades 10 for preventing scratches with different retraction amounts d, you can use the spare blades 10 for preventing scratches according to the purpose of cutting.
By selecting and installing 0, the cutting edge 13' of the replaceable blade 10 for preventing backlash can be installed at the optimum position.

A suitable setback amount d for finishing is 0.1 to 0.2 mm, a suitable setback amount d for medium cutting is 0.2 to 1 mm, and a suitable setback amount d for rough cutting is 1 to 3 mm.

The blade edge 13 of the cutting blade 9 wears out during cutting work, so by replacing the cutting blade 9, excellent sharpness can be maintained at all times. Since no direct cutting work is performed on the blade, there is almost no wear unless the blade is damaged due to abnormal use, and it can be used for a long period of time.

In the replaceable blade plane of the present invention, the back metal 6 is the replacement blade 9 for cutting.
The spare blade 10 for preventing back-grain is fixed in close contact with the plane blade 1, and the plane body 1 is placed on the plane stand 7 in the same way as a normal plane.
It has the function of adjusting the amount of protrusion of the cutting edge 113 of the cutting blade 9 from the planer stand 7 by fixing it at a certain position in the retaining groove 8 of the cutting blade 9. However, the back-grain prevention effect is achieved by the blade 10. Therefore, there is no need to finely adjust the position of the backing metal 6, and the tip position of the backing metal 6 only needs to be located behind the hook position of the replaceable blade 10 for preventing reverse stitches.

〔Effect of the invention〕

According to the replaceable blade type plane of the present invention, the structure of the plane is simple, the cutting blade 9 and the blade 10 for preventing cross-cutting are extremely easy to attach and detach, and the spare blade and the plane blade 1 are integrated. Therefore, it can be used in exactly the same way as a conventional plane, and the cutting edge 13' of the spare blade 10 for preventing back-grain
The amount of retreat d of the replaceable cutting blade 9 from the cutting edge 13 can be very easily adjusted to a constant amount suitable for the purpose of the cutting operation.

The cutting edge 13 of the cutting blade 9 and the blade 10 for preventing backlash
The cutting edges 13' of the blades can be kept parallel at all times, and the positions of the cutting blade 9 and the back-grain prevention blade 10 do not change during the cutting operation.

By preparing and replacing several types of spare blades 10 with different retraction distances d, anyone can easily install the spare blades 10 in the optimum position, especially when finishing. For cutting work,
In conventional planes, it required skill and time to adjust the back metal 6, but with the replaceable blade plane of the present invention, skill is not required and anyone can easily adjust it without spending much time.

Therefore, according to the replaceable blade plane of the present invention, an extremely beautiful cutting finish can be achieved regardless of whether the user is skilled or not.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a replaceable blade type plane of the present invention, and FIG. 2 is a sectional view of a conventional replaceable blade type plane. Fig. 3 is a plan view of the replaceable blade type plane of the present invention, Fig. 4 is a plan view of the blade tip 13 of the plane body of the replaceable blade type plane of the present invention, Fig. 5 is a bottom view of the plane, and Fig. 6 is a plan view of the plane body of the replaceable blade type plane of the present invention.
7 is a plan view of the cutting blade of the replaceable blade type plane of the present invention and a spare blade for preventing back-grain. FIG. 8 is a plan view of the cutting blade of the replaceable blade type plane of the present invention and the reverse side view. A plan view of a plane blade equipped with a spare blade for preventing scratches, FIG. 9 is a partially enlarged cross-sectional view taken along line A-A, and FIGS. 10 and 11 are other implementations of a plane blade equipped with a spare blade of the present invention. Plan view of embodiment, 12th
The figure is a sectional view of another embodiment of a plane blade equipped with a replaceable blade of the present invention. 1... Planer blade, 2... Spare blade, 3... Notch, 4... Protrusion, 5... Notch, 6... Back metal, 7... Planer stand, 8... Holding groove, 9... Spare blade for cutting, 10... Back-grain prevention spare blade,
11... Rear end, 12... Upper end surface, 13... Cutting edge, 14...
Top surface, 15...through hole.

Claims (1)

[Scope of Claims] 1. In a known flat plane consisting of a wooden plane stand, a plane blade that fits into a holding groove provided in the plane stand, and a back metal overlaid on the plane blade, the plane blade has a substantially rectangular thin steel plate. In order to ensure that the two spare blades, one for cutting and the other for preventing reverse stitches, are fitted together exactly on top of each other, the blades are shaped like shallow steps with a depth that is approximately the same as the total thickness of the two spare blades. In addition to providing a notch part, both the cutting blade and the blade for preventing back-grain are single-edged, and the length from the rear end of the blade to the tip of the blade is such that the blade for cutting is better for preventing back-grain. A difference is provided so that the blade is 0.1 to 3 mm longer than the replaceable blade, and two or more protrusions are provided on the upper surface of the notch, and the protrusions fit into the replaceable blade for cutting and the replaceable blade for preventing backlash. A through hole or notch is provided for the cutting blade and the flat side of the single blade of the blade for preventing backslash to be brought into close contact with each other, and the two blades are overlapped so that the rear end positions of the blades coincide with each other. A replaceable blade type plane, characterized in that the plane body and two replaceable blades are integrated by fitting into the notch part of the plane body, and this and a back metal are overlapped and fitted into the holding groove. 2. The replaceable blade plane according to claim 1, wherein the cutting blade has a cutting edge angle of 27 to 30 degrees. 3. The replaceable blade type plane according to claim 1, wherein the blade edge angle of the replaceable blade for preventing back-grain is 60 to 80 degrees. 4. The blade edge of the blade for preventing backlash should be 0.1 to 0.3 mm at a cutting edge angle of 60 to 80 degrees, and the subsequent part should be at an angle of 20 to 30 degrees.
A replaceable blade plane according to claim 3. 5. The replaceable blade plane according to claim 1, wherein the protrusions are provided at both end corners of the upper surface of the notch.