JPH0768503A - Chain blade and saw chain using blade - Google Patents

Abstract

PURPOSE:To provide a saw chain having a narrow cutting width and a light weight by reducing in weight a chain blade and decreasing components for constituting the chain. CONSTITUTION:Front and rear parts of a chain blade 1 are bent substantially in parallel to integrally form the cutter 1 of a three-stage structure having a front part F, a central part C and a rear part R, a blade 2 is formed at the upper part, and a driving pawl 5 is formed at the part C. The blade 1 having connecting holes 4, 7 at the parts F, R and a chain blade 8 symmetrical to the cutter 1 are formed, and the blades 1, 8 are alternately connected to form a saw chain 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain blade and a chain blade used for a chain saw for cutting wood or hard materials, or a mowing machine for hedges, plants, etc., or a mower or lawn mower for mowing. The present invention relates to a saw chain (in the present specification, a chain in which chain blades are connected).

[0002]

2. Description of the Related Art Conventionally, a saw chain used in a chain saw is as shown in the exploded perspective view of FIG. 12, and comprises a cutter link 101, 102, a drive link 103 (center link) and a side link 104. The saw chain 106 is formed by connecting three kinds of parts together using a rivet 105.

In the saw chain 106, the lower part of the drive link 103 is driven by a driving sprocket (not shown), so that the drive link 103 slides in a guide groove g formed in the center of the guide bar G. While rotating, the side links 104 rotate while sliding on the rail portion r which is the outer circumference of the guide bar G, and the cutter links 101 and 102 that rotate together with these links rotate the outer circumference of the guide bar G while timber, etc. Is configured to disconnect.

[0004]

However, since the saw chain 106 is formed in a state in which the drive link 103 is sandwiched by the cutter links 101, 102 or the side links 104 from both sides, the saw chain 106 is formed in three pieces.
The width as 106 is thick. Therefore, this saw chain 10
When the object to be cut is cut by 6, the cutting width is thick, so that it is difficult to cut into a predetermined size, and a large amount of material loss occurs.

Therefore, the saw chain 106 can be used for cutting that does not require accurate cutting dimensions such as felling timber, but is not suitable for cutting that requires accurate cutting dimensions. Is.

Further, since the saw chain 106 has a wide cutting width, when cutting a thin plate or the like, it may not be possible to cut it depending on the plate thickness, and further for cutting (cutting) soft materials such as grass and grass. Is not used because it is difficult to use.

Further, since the saw chain 106 is made up of a large number of three-piece components, it is heavy and has a wide cutting width, which requires a large amount of power and a large prime mover. Since the thickness of the guide bar G also becomes large, it is difficult to reduce the weight of the chainsaw itself.

In view of the above problems, it is an object of the present invention to provide a saw chain which is light in weight, has a small number of parts constituting the saw chain, and has a narrow cutting width and a light weight.

[0009]

In order to achieve the above object, the chain blade according to the first aspect of the invention is a chain blade that rotates along a guide groove formed in a guide bar.
By bending the front and rear portions of the chain blade substantially parallel to each other, a chain blade having a three-stage structure including a front portion, a central portion and a rear portion is integrally formed, and a cutter is formed on the upper portion of the chain blade. At the same time, drive claws are formed in the lower part of the central part, and connecting holes are provided in the front part and the rear part.

A chain blade according to a second aspect of the invention is characterized in that, in the first aspect of the invention, the guide portion is formed by pressing or bending the lower portions of the front portion and the rear portion.

Further, the saw chain according to the third invention is
Forming a chain blade symmetrical to the chain blade of the first invention or the second invention, the chain blade and the first invention or the second invention
It is characterized in that the chain blade of the invention is alternately connected.

Further, the saw chain in the fourth invention is
It is characterized in that the chain blades of the first invention or the second invention are connected.

Further, the saw chain in the fifth invention is
An intermediate link is provided between the chain blades of the saw chain of the third invention or the fourth invention.

The saw chain according to the sixth aspect of the invention is
Chain blades with a cutter formed on the upper part and drive claws on the lower part, and an intermediate link with a drive claw formed on the lower part and the three-stage structure in which the front part and the rear part are bent substantially in parallel are integrally connected It is characterized by having done.

[0015]

According to the structure of the first invention, the chain blade is integrally formed with a three-step structure consisting of the front portion, the central portion and the rear portion, and the cutter is formed on the upper portion of the chain blade, and the central portion is formed. Since the drive claw is formed in the lower part of the and the connecting hole is provided in the front part and the rear part, one chain blade having a three-stage structure exhibits a plurality of functions.

Further, according to the structure of the second aspect of the invention, since the guide portion is formed by pressing or bending the lower portions of the front portion and the rear portion, the guide portion forms a wide area of the rail portion on the outer periphery of the guide bar. Will follow.

Further, according to the configuration of the third invention, the first
A chain blade symmetrical to the chain blade of the invention or the second invention is formed, and the chain blade of the first invention or the second invention is alternately connected to form a continuous saw chain. , A saw chain consisting of two chain blades only on the front and back, resulting in a saw chain with a small number of parts.

Also, according to the structure of the fourth invention, since the continuous saw chain is formed by connecting the chain blades of the first invention or the second invention, only the front and rear portions are composed of two chained blades. It becomes a saw chain and has a small number of parts.

Further, according to the above fifth aspect of the invention, the third aspect
Since the intermediate link is provided between the chain blades of the saw chain of the invention or the fourth invention, the pitch between the cutters becomes wide.

According to the structure of the sixth aspect of the invention, the chain blade having the cutter formed on the upper part and the drive claw formed on the lower part and the front and rear parts are bent substantially in parallel and the drive claw is formed on the lower part. Since the saw chain is formed by alternately connecting the intermediate links, the saw chain having a simple structure can be formed.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing a first example of a chain blade according to the present invention, FIG. 2 is a side view, FIG. 3 is a sectional view taken along line AA shown in FIG. 1, and FIG. 4 is a sectional view taken along line BB shown in FIG. It is a figure.

As shown in the figure, the chain blade 1 is formed by bending the front portion and the rear portion in the same direction so as to be substantially parallel to each other.
A three-step structure including a front part F, a central part C, and a rear part R is integrally formed, and step parts 1a and 1b each having a thickness of about half or more of the plate thickness are formed at each bent part. Has been done.

In the rear part R, a cutter 2 is formed on the upper part and a bent guide part 3 is formed on the lower part.
A large connecting hole 4 is provided at a predetermined position substantially in the center. This cutter 2 has the same shape as the conventional one, and has a blade formed by bending the upper portion of the rear portion R. A drive claw 5 is formed in the lower portion of the central portion C, and the drive claw 5 is formed so as to be driven by being engaged with a drive gear (not shown) as in the conventional case. on the other hand,
The front portion F is formed with a bent guide portion 6 at the lower portion, and a small connecting hole 7 is provided at a predetermined position substantially in the center.

The chain chain blade 1 thus formed is
The functions of the conventional cutter links 101 and 102 are in the rear part R, the functions of the drive link 103 are in the central part C, and the side links 10
Since the rear part R and the front part F have the function of 4,
One chain blade 1 with a three-stage structure has three conventional functions.

The guide portion 3 of the rear portion R and the guide portion 6 of the front portion F are used when the chain blade 1 slides on the rail portion r which is the outer periphery of the guide bar G as shown in FIG. The guide portions 3, 6 are formed by bending the lower portions of the guide portions 3 and 6 so as to be guided by the entire surface of the rail portion r.

The guide portions 3 and 6 may be formed by pressing the lower portions of the rear portion R and the front portion F from the inside to the outside, as shown in the sectional view of FIG. The guide is possible even if it is not provided.

The chain blade 1 thus constructed is formed by bending the rear portion R and the front portion F leftward as shown in the plan view of FIG. 6 (a) and the front view of FIG. 6 (b). It has a left cutter 2. Therefore, a chain blade 8 having a right cutter 9 is formed by forming a symmetrical chain blade in which the front and the rear are bent in the opposite direction to the chain blade 1, and the rear of these chain blades 1, 8 is formed. By connecting the connecting holes 4 and 7 provided in the part R and the front part F with the rivet 10, the saw chain 11 of the first embodiment in which the cutters 2 and 9 are alternately provided can be formed.

This saw chain 11 is one in which a chain blade 1 having a left cutter 2 and a chain blade 8 having a right cutter 9 are alternately connected to each other to form a saw chain 11, the connecting portion of which is shown in FIG. As shown in the D-D enlarged cross-sectional view, the connecting hole 4 provided at the rear portion R of the chain blade 8
And a connecting hole 7 provided in the front portion F of the chain blade 1 are connected by a rivet 10. This rivet 1
0 is formed in two steps. The large diameter portion 10a is fitted in the connecting hole 4 in the rear portion R and the small diameter portion 10b is fitted in the connecting hole 7 in the front portion F, and when the tip of the rivet 10 is crushed, the large diameter portion 10a is formed. The length (height) is such that the chain blades 1 and 8 are connected to each other with a minute gap left therebetween. By continuously connecting the chain blades 1 and 8 in this manner, the saw chain 1 can be connected without connecting many parts as in the conventional case.
1 can be formed. Since the rivet 10 is configured to be inserted from one side of the connecting portion, it is not necessary to be crushed from both as in the conventional case, and the rivet 10 is crushed from one side.

In the saw chain 11 of the first embodiment thus connected, the connecting portion is connected by the two blades of the chain blades 1 and 8, so that the saw chain 11 has a narrow chain width and is light. Further, the width between the chain blades 1 and 8 is narrowed, so that the cutting width of the cutters 2 and 9 is also thin.

Saw chain 11 constructed as described above
According to the above, it is attached to a chainsaw or the like and acts as follows.

That is, when the drive claw 5 formed in the lower portion of the central portion C is driven by a sprocket (not shown), the drive claw 5 travels in the guide groove g of the guide bar G and guides the rear portion R and the front portion F. The parts 3 and 6 rotate while sliding on the rail part r which is the outer periphery of the guide bar G (see FIG. 3).

At this time, the cutters 2, 9 formed on the upper part of the rear portion R also rotate around the outer circumference of the guide bar G, so that the cutter 2, 9 cuts the object to be cut, and the cutting reaction force is the cutting reaction force. It is received by the rail portion r via 3,6. In this cutting, since the chain blades 1 and 8 are composed of two blades, the cutting width is narrow and the material can be cut accurately with a small loss.

Further, since the width of the chain blades 1 and 8 becomes smaller, the thickness of the guide bar G can be made thinner.
The weight of the entire chainsaw can be significantly reduced.

In the saw chain 11 of the first embodiment, the saw chain 11 is formed by continuously connecting the chain blade 1 of the left cutter 2 and the chain blade 8 of the right cutter 9. Therefore, the pitch of the cutter is the same as the pitch of the chain blades 1 and 8. However, in the case of this configuration, a large number of expensive cutters are required, resulting in an expensive saw chain.

Therefore, as in the second embodiment shown in the plan view of FIG. 8 (a) and the front view of FIG. 8 (b), a chain blade having a cutter and an intermediate link 20 having no cutter are alternately connected. The saw chain 21 is formed by. The same components as those in the first embodiment will be described with the same reference numerals.

As shown in the plan view of FIG. 9 (a) and the front view of FIG. 9 (b), this intermediate link 20 is a cutter 2 (or 8) formed on the chain blade 1 (or 8) in the first example. 9) is deleted and the front part and the rear part are bent in opposite directions to form a three-step structure consisting of a front part F, a central part C and a rear part R, and the drive claws 5 are provided below the central part C. It was formed. The rear part R and the front part F are provided with connecting holes 4 and 7.

The saw chain 21 of the second embodiment using the intermediate link 20 has cutters 2, 9 as shown in FIG.
Although the pitch is larger than that of the saw chain 11 of the first embodiment, an inexpensive saw chain 21 can be manufactured.

Even if the saw chain 21 is formed by providing the intermediate link 20 as described above, the number of parts is small, so that the weight can be significantly reduced, and the saw blades 21 are provided before and after the chain blades 1 and 8 and the intermediate link 20. Since the connecting holes 4 and 7 are joined together by the rivet 10, a saw chain having a small cutter width can be formed. As a result, the cutting width is also reduced, and more accurate cutting is possible.

By the way, the cutters 2, 9 of the saw chains 11, 21 in the first and second embodiments are
Like conventional saw chains, it is suitable for cutting relatively thick timber, but has a shape unsuitable for thin plates such as wood and hard materials.

Therefore, as in the third embodiment shown in the plan view of FIG. 10 (a) and the front view of FIG. 10 (b), if a blade portion is formed in a saw-tooth shape, a thin plate such as a hard material or wood can be cut. It will be possible.

The saw-toothed chain blade 33, which is the chain blade of the second example, is bent forward at the front portion and the rear portion in opposite directions, like the intermediate link 20 in the saw chain 21 of the second embodiment. A saw blade-shaped cutter 32 having a plurality of triangular blades is formed on the upper part of the three-stage structure including a part F, a central part C, and a rear part R.
Drive claws 5 are formed on the lower part. The saw blade-shaped cutter 32 is formed into a cutter similar to a saw blade provided with a so-called clam, which is divided into right and left alternately.

If the saw chain 31 of the third embodiment shown in FIG. 10 is formed by connecting the saw blade chain blades 33 provided with the saw blade cutter 32, the thin plate material can be cut by the conventional saw. In addition to downsizing the chain saw, it can be applied to a new small cutting machine that is simple and close to a hand saw for carpenters. Further, by adopting a wear resistant material such as a cemented carbide material for the saw blade-shaped cutter 32, it can be used for cutting a hard material.

Further, as in the saw chain 41 of the fourth embodiment shown in the plan view of FIG. 11A and the front view of FIG.
If it is formed in a straight blade shape, it is possible to cut grass, grass, etc.

A straight blade-shaped chain blade 43, which is the chain blade of the third example, has a straight blade-shaped cutter 42 formed in the upper part of the central portion C and a drive claw 5 formed in the lower part.
Similar to the second embodiment, the straight blade-shaped chain blade 43 having the straight blade-shaped cutter 42 and the intermediate link 2 having no cutter are provided.
The saw chain 41 is formed by alternately connecting 0 and 0.

According to the saw chain 41 provided with the straight blade cutter 42 in this way, it is possible to cut grass, grass and the like, and it can be used for various purposes such as a mower or a lawn mower. In this case, the horsepower of the driving prime mover may be further reduced because it is used for mowing or the like.

In the chain blades 1, 8, 33, 43 in the above-mentioned first to third examples, the pitch of the connecting holes 4, 7 formed in the rear portion R and the front portion F is different, This pitch may be set to an optimum value depending on the size of the chain saw, the length of the saw chain, etc., and is not particularly limited.

By the way, when cutting grass, grass, etc. like the saw chain 41 of the fourth embodiment, the cutting reaction force acting on the cutter at the time of cutting is small, so grass, grass, etc. can be cut. Unless the saw chain 41 is rotated at a predetermined speed, the saw cannot be cut efficiently.

Therefore, like the saw chain 51 of the fifth embodiment shown in the plan view of FIG. 12 (a), the front view of (b), and the VV sectional view of (c), it is fixed to the guide bar G side. Provide a blade L,
If grass or grass is cut between the fixed blade L and the rotating chain blade 53, it is possible to cut efficiently.

The straight-blade type chain blade 53, which is the chain blade of the fourth example, bends the straight-blade type cutter 52 provided in the upper part of the central portion C to one side so as to protrude from the head of the rivet 10. The drive claw 5 is formed on the bottom,
Similar to the fourth embodiment, the straight blade chain blade 53 having the straight blade cutter 52 and the intermediate link 2 having no cutter are provided.
The saw chain 51 is formed by alternately connecting 0 and 0. On the other hand, a fixed blade L is provided on the guide bar G on the fixed side, and the cutter 5 of the straight blade-shaped chain blade 53 is provided.
It is provided on one side of the guide bar G so that it can be cut with the two.

According to the saw chain 51 of the fifth embodiment constructed as described above, it becomes possible to easily cut grass, grass and the like between the rotating saw chain 51 and the fixed blade L, and moreover, Since the saw chain 51 can be cut even if the rotational speed thereof is slowed, noise can be reduced and the horsepower of the driving prime mover can be further reduced.
In this case, if the blade length of the fixed blade is made longer than that of the chain blade 53 (rotary blade), the fixed blade L first comes into contact with stones, concrete, or the like at the time of cutting. The cutter 52 is less damaged, and the risk of contact with the rotary blade is eliminated. It should be noted that even if the saw chain itself of the present invention breaks during the work, it is immediately released from the guide bar, which is safe.

Further, as described above, the cutting reaction force acting on the cutter when cutting grass or the like is small, so that FIG.
The saw chain 61 is guided by only one of the rail portions r of the guide bar G, as in the saw chain 61 of the sixth embodiment shown in the plan view of FIG. 5, the front view of FIG. The straight blade blade 63 of the fifth example configured as described above can also efficiently cut grass, grass and the like.

The straight blade-shaped chain blade 63, which is the chain blade of the fifth example, is formed by bending the upper portion without forming a step on the chain blade to form the straight blade-shaped cutter 62, and the drive claw 5 at the lower portion. It was formed. Further, the intermediate link 65 has a three-stage structure integrally formed by bending the front part and the rear part in substantially the same direction, and each bent part has a thickness substantially equal to or greater than the plate thickness. Steps 65a, 6
5b is formed.

Then, similarly to the above fourth and fifth embodiments, the saw blade 61 is formed by alternately connecting the straight blade chain blade 63 having the straight blade cutter 62 and the intermediate link 65 having no cutter. ing. On the other hand, a fixed blade L is provided on the guide bar G that is the fixed side, and is provided on one side of the guide bar G so that it can be cut by the cutter 62 of the straight blade chain blade 63.

According to the saw chain 61 of the sixth embodiment thus constructed, one rail portion r of the guide bar G is formed.
The grass, grass and the like can be easily cut by being guided by the same as the saw chain 51 of the fifth embodiment. Therefore,
When used in a brush cutter or the like having a fixed blade L, the same effect as the saw chain 51 of the fifth embodiment can be obtained.

As described above, according to the present invention, by properly selecting a cutter, it can be used for various purposes such as cutting or mowing hard materials (vinyl chloride pipes, flex pipes, ALC plates, etc.) and wood. A saw chain can be formed.

Further, in any of the above-described embodiments, as shown by the chain double-dashed line X in FIG. 2, the drive claw 5 at the lower part of the central portion C is laterally pressed and the drive claw 5 is further thinned to guide. Since the width of the groove g can also be made thin, the thickness of the guide bar G itself can be made thin, which makes it possible to further reduce the weight of the chain saw as a whole and to make the prime mover of a smaller output. It will be possible.

It should be noted that, in each of the above-mentioned embodiments, a cutter made of, for example, ceramic can be used in addition to the cutter, and each structure adopted in each embodiment is appropriately selected and adopted according to the purpose of use, the purpose of use, etc. Just do it again
A combination of these configurations may be selected as appropriate.

[0058]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the present invention, the drive claw that rotates along the guide groove formed in the guide bar and the lower part of the front part and the lower part of the rear part that rotates while sliding along the outer periphery of the guide bar are covered. Since the cutter for cutting the cut object is integrally formed by the chain blade having the three-stage structure in which the front portion and the rear portion are bent, the chain blade can be significantly reduced in weight.

According to the second aspect of the invention, when the guide portion is formed in the lower portion of the front portion and the lower portion of the rear portion, the guide portion rotates while sliding on the large area of the outer circumference of the guide bar. There is no uneven wear on the outer circumference of the bar.

Further, according to the third and fourth aspects of the invention, when the front and rear portions of a plurality of chain blades are connected to each other to form a continuous saw chain, only the front and rear portions of the chain blades are formed. Since the two chains are overlapped, it is possible to form a thin and lightweight saw chain with few components.

Further, according to the fifth invention, since the intermediate link is provided between the chain blades, it is possible to form an expensive saw chain with few chain blades and to manufacture an inexpensive saw chain.

Further, according to the sixth invention, since the chain blade is not bent, the chain blade can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a front view showing a first example of a chain blade according to the present invention.

FIG. 2 is a side view of the chain blade shown in FIG.

3 is a cross-sectional view taken along the line AA shown in FIG.

FIG. 4 is a sectional view taken along line BB shown in FIG.

5 is a cross-sectional view showing another example of the AA cross section shown in FIG.

6A and 6B are drawings showing a first embodiment of a saw chain in which the chain blades of the first example shown in FIG. 1 are connected, and FIG. 6A is a plan view and FIG. 6B is a front view.

7 is an enlarged cross-sectional view taken along line DD of FIG.

FIG. 8 is a drawing showing a second embodiment of a saw chain in which the chain blades of the first example are connected using an intermediate link, (a)
Is a plan view and (b) is a front view.

9 is a drawing showing the intermediate link shown in FIG. 8, (a)
Is a plan view and (b) is a front view.

FIG. 10 is a drawing showing a third embodiment of a saw chain in which the saw blade chain blades of the second example in which the blade portions are formed in a saw blade shape are connected, (a) is a plan view, and (b) is a front view. It is a figure.

FIG. 11 is a view showing a fourth embodiment of a saw chain in which straight blade blades of the third example in which the blade portions are formed in a straight blade shape are connected, (a) is a plan view, and (b) is a front view. It is a figure.

FIG. 12 is a view showing a fifth embodiment of a saw chain in which straight blade blades of the fourth example in which the straight blade portions are bent are connected, (a) is a plan view, and (b) is a plan view. Front view, (c) is V-V
FIG.

FIG. 13 is a view showing a sixth embodiment of a saw chain in which straight blade blades of the fifth example in which straight blade portions are bent without forming a step portion are connected, and (a) is A plan view, (b) is a front view, and (c) is a WW cross-sectional view.

FIG. 14 is an exploded perspective view showing a conventional chain blade.

[Explanation of symbols]

 1 ... Chain blade (left) 1a, 1b ... Step portion 2 ... Cutter (left) 3 ... Guide portion 4 ... Connecting hole 5 ... Drive claw 6 ... Guide portion 7 ... Connecting hole 8 ... Chain blade (right) 9 ... Cutter ( Right) 10 ... Rivet 11, 21, 31, 41, 51, 61 ... Saw chain 20 ... Intermediate link 32 ... Saw blade cutter 33 ... Saw blade chain blade 42, 52, 62 ... Straight blade cutter 43, 53, 63 ... Straight blade chain blade F ... Front part C ... Central part R ... Rear part G ... Guide bar g ... Guide groove r ... Rail part

Claims (6)

[Claims] 1. A chain blade that rotates along a guide groove formed in a guide bar, wherein a front portion and a rear portion of the chain blade are bent substantially in parallel to form a front portion, a central portion, and a rear portion. A chain blade having a three-stage structure is integrally formed, a cutter is formed on the upper portion of the chain blade, a drive claw is formed on the lower portion of the central portion, and a connecting hole is provided in the front portion and the rear portion. A chain blade characterized by that. 2. The chain blade according to claim 1, wherein the guide portion is formed by pressing or bending the lower portions of the front portion and the rear portion. 3. Forming a chain blade symmetrical to the chain blade according to claim 1 or 2, and connecting the chain blade and the chain blade according to claim 1 or 2 alternately. A characteristic saw chain. 4. A saw chain comprising the chain blade according to claim 1 or 2 connected thereto. 5. A saw chain, wherein an intermediate link is provided between the chain blades of the saw chain according to claim 3 or 4. 6. An intermediate link in which a chain blade having a cutter formed on an upper portion thereof and a drive pawl formed on a lower portion thereof is integrally formed with a three-stage structure in which a front portion and a rear portion are bent substantially in parallel and a drive pawl is formed at a lower portion thereof. A saw chain characterized by alternately connecting and.