JPH0360281B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cutting blade for a chain saw, which corresponds to a conventional saw chain. It is characterized in that it does not require tension adjustment during use, has strength comparable to that of conventional saw chains, and has no risk of breakage.

[Conventional technology]

BACKGROUND ART Conventionally, so-called saw chains have been provided as cutting blades for chain saws, in which a part of a linked chain, like a bicycle chain, is provided with a specially processed blade portion.

However, since the saw chain was constructed by combining a large number of parts, it required a large number of manufacturing steps, and had the disadvantage that manufacturing was labor-intensive and increased costs. In addition, because Saw Chain uses a so-called chain structure, if used for a long time, the connecting parts will wear out and the length will stretch beyond its original length, so it is necessary to adjust the tension before use, which is a hassle. It was hot.

[Problem that the invention seeks to solve]

The present invention eliminates the above-mentioned drawbacks of the prior art. It has a small number of parts, is extremely easy to manufacture, can be provided at low cost, does not require tension adjustment during use, and has strength comparable to that of conventional saw chains. , it is an object of the present invention to provide a cutting blade for a chain saw that is free from damage.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a flexible metallic deformed wire (hereinafter simply referred to as deformed wire) having a substantially T-shaped cross section in which a band portion and a raised portion are integrally formed. The remaining raised portions are removed at appropriate intervals to serve as blade portions, both ends of the deformed wire are welded together, and holes are provided in the band portions to fit the driving sprockets.

[Effect]

According to the present invention, since the upright portions of the irregularly shaped wire having a substantially T-shaped cross section that have been precisely machined by drawing are removed at appropriate intervals, the band portion of the irregularly shaped wire becomes more easily bent. Then we welded both ends of the band of the irregularly shaped wire,
The irregularly shaped wire band has the same effect as a belt. Therefore, if the drive sprocket, which is guided by a guide plate and connected to the prime mover via a centrifugal clutch or the like, is fitted into the hole provided in the band and applies driving force, the remaining part of the upright part that has become the blade part can be removed. This part travels in a fixed direction and can cut wood, etc. in the same way as conventional saw chains.

In the present invention, the cross section approximately T which is a single component is
Since it can be manufactured by simply processing a character-shaped irregular wire and is not manufactured by combining a large number of parts as in conventional saw chains, manufacturing is extremely easy.

In addition, in the present invention, there is no connecting part like the conventional saw chain, so there is no wear of the connecting part,
Since the length remains almost the same even after long periods of use, there is no need to adjust the tension, simplifying maintenance.

Furthermore, in the present invention, a separately prepared blade part is not provided on the band part, but a deformed wire in which the band part and the raised part are integrally formed in advance is used, and the remainder of the raised part is used as the blade part. It is advantageous in terms of strength. In addition, by appropriately determining the thickness of the band portion and the standing portion of the deformed wire, the band portion can be given a certain degree of flexibility, and the blade portion can be given sufficient strength. Therefore, by applying heat treatment such as hardening only to the blade part, it is possible to give the blade part a predetermined hardness without impairing the flexibility of the band part. Therefore, it has strength comparable to that of conventional saw chains, and there is no risk of breakage. Furthermore, since the band portion is provided with a hole that fits the drive sprocket, the drive transmission is extremely reliable. It is possible to further ensure drive transmission.

〔Example〕

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

First, a deformed wire 3 having a substantially T-shaped cross section is prepared, in which the band portion 1 and the upright portion 2 are precisely machined into one piece by drawing. This profiled line 3 is shown in FIG. Figure a is its plan view, figure b is its front view,
Figure c is its right side view. The deformed wire 3 is manufactured, for example, by cold drawing and cut into a predetermined length. The thickness of the band portion 1 is made relatively thin so as to have a predetermined flexibility, and the thickness of the raised portion 2 is made relatively thick so as to have a predetermined strength.

Next, the raised portions 2 of the irregularly shaped wire 3 are removed at appropriate intervals, and the remaining portions 2a of the raised portions 2 are used as blade portions. This process is sequentially shown in FIGS. 2 to 5.

Figure 2 shows the state in which the upright portions 2 of the irregularly shaped wire 3 have been removed at appropriate intervals; Figure a is a plan view, Figure b is a front view, and Figure c is a right side view. It is. The above-mentioned upright portion 2 is removed by, for example, a so-called blank cut by press working. Furthermore, after the above-mentioned standing portion 2 is removed, the belt portion 1 is removed.
A hole 4 is provided in the hole 4 to accommodate a drive sprocket (not shown). The hole 4 is formed by what is called a pierce cut by press working.

FIGS. 3 to 5 show the processing process in which the remaining portion 2a of the upright portion 2 is used as the blade portion 5. FIG. first,
The remaining portions 2a of the upright portions 2 are bent in alternate directions at the bending position 6, resulting in the state shown in the third figure. Figure a is its plan view, figure b is its front view, figure c
is its right side view. Next, the remaining portion 2a of the bent upright portion 2 is subjected to a shaving process to form a blade 7, resulting in the state shown in the fourth figure.
Figure a is a plan view thereof, and figure b is a front view thereof. Furthermore, heat treatment processing such as hardening such as induction hardening and tempering is performed so that the remaining portion 2a of the standing portion 2 on which the blade 7 is formed has a predetermined hardness.
Furthermore, the blade 7 is sharpened by polishing, and the blade portion 5 is completed. In addition, in the case of the drawing example, the fifth
The hatched portion X shown in the figure is subjected to heat treatment.

Finally, as shown in FIG. 6, both ends 8a of the deformed wire 3,
8b is welded to complete the chain saw cutting blade a of the present invention. The above welding is performed, for example, by so-called resistance welding, which is a type of electric welding, while applying force in a direction to bring the ends 8a and 8b into contact with each other.

According to the present invention having the above-mentioned configuration, since the upright portions 2 of the irregularly shaped wire 3 are removed at appropriate intervals, the band portion 1 of the irregularly shaped wire 3 becomes more easily bent. Since both ends 8a and 8b of the irregularly shaped wire 3 were welded, the band portion 1 of the irregularly shaped wire 3
has the same effect as a belt. Therefore, if a drive sprocket, etc., connected to the prime mover via a centrifugal clutch, etc., is guided by a guide plate and fitted into the hole 4 provided in the band portion 1, and a driving force is applied, the blade portion 5 and The remaining portion 2a of the standing portion 2 travels in a fixed direction and can cut wood, etc. in the same way as a conventional saw chain.

As described above, in the present invention, holes 4 that fit the driving sprocket are provided in the band portion 1, but if the driving force is applied by a driving roller, it is not necessary to provide the holes 4. However, in the case where the driving force is applied by the driving roller, there is a risk that the driving force cannot be transmitted during overload, and the driving roller idles, causing burnout due to frictional heat.

However, in the present invention, the hole 4 is provided in the band portion 1, and the driving force can be applied by the driving sprocket, so that the driving force can be reliably transmitted, and there is an advantage that the above-mentioned disadvantage can be eliminated. Furthermore, without providing the hole 4 in the band part 1, by integrally molding Teflon, rubber, or the like on the lower surface of the band part 1, it is possible to use a timing belt system to reliably transmit the driving force.

As described above, the present invention can be manufactured by simply processing the irregularly shaped wire 3 having a substantially T-shaped cross section, which is a single part, and can be manufactured by combining a large number of parts like the conventional saw chain. Because it is not
Manufacturing becomes significantly easier.

In addition, in the present invention, there is no connecting part like the conventional saw chain, so there is no wear of the connecting part,
Since the length remains almost the same even after long periods of use, there is no need to adjust the tension, simplifying maintenance.

Furthermore, in the present invention, a separately prepared blade part is not provided on the band part, but a deformed wire 3 in which the band part 1 and the standing part 2 are integrally formed is used.
Since the remainder is used as the blade portion 5, it is advantageous in terms of strength. In addition, by appropriately determining the thickness of the band portion 1 and the standing portion 2 of the deformed wire 3, the band portion 1 can be provided with a predetermined flexibility, and the blade portion 5 can be provided with sufficient strength. Moreover, since steel is used, the blade part 5 can be given a predetermined hardness by applying heat treatment such as hardening only to the blade part 5 without impairing the flexibility of the band part 1. It is. Therefore, it has strength comparable to that of conventional saw chains, and there is no risk of breakage.

Note that, in the present invention, it is clear that the shape of the blade portion 5 is not limited to that shown in the drawings.

〔Effect of the invention〕

According to the present invention, the number of parts is small, manufacturing is extremely easy and inexpensive, and there is no need to adjust the tension during use.Furthermore, it has the same strength as a conventional saw chain and has the effect of being free from breakage. That's what you get.

Further, since the band portion is provided with a hole that fits the drive sprocket, the drive transmission can be made even more reliable.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1a is a plan view of a deformed wire, Fig. 1b is a front view thereof, Fig. 2c is a right side view thereof, and Fig. 2a is a press working process. Fig. 3B is a front view, Fig. 3C is a right side view, Fig. 3A is a plan view showing the bending process, Fig. 3B is a front view, and Fig. 3C is a right side view. , Fig. 4 is a plan view showing the shaving process, Fig. 5 is a front view showing the heat treatment process, and Fig. 6 is a plan view showing the shaving process.
Figure a is a plan view showing the cutting blade for a chain saw of the present invention;
Figure b is a front view thereof. DESCRIPTION OF SYMBOLS 1... Band part, 2... Standing part, 2a... Rest of standing part, 3... Deformed wire, 5... Blade part, a... Cutting blade for chain saw.

Claims (1)

[Claims] 1. The above-mentioned raised part of the flexible metal irregularly shaped wire having a T-shaped cross section, in which the band part and the raised part are integrally formed, is removed at an appropriate interval, and the remainder of the raised part is used as the blade part, and the above-mentioned irregularly shaped wire is A cutting blade for a chainsaw, characterized in that both ends of the cutting blade are welded together, and a hole is provided in the band portion to fit a driving sprocket.