JP2002254402A - Chain saw for cutting branch at high position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a cutting operation part (m) of a cutting edge chain means 2 act on branch cutting treatment more effectively and directly than a conventional one by making support of a supporting rod member 1 by an operator easy, and enabling the branch (w) to be stably cut even though a branch-pressing bar is not provided. SOLUTION: In a chain saw for cutting a branch at a high position wherein a handle part 5 is provided at a root part of a support rod member 1 having a several-meter length and a cutting edge chain means 2 to be operated by transmission of a rotary drive force is provided at a tip part, a projection part (h) projected toward a specific direction f1 of a side part of the tip part is formed at the tip part of the support rod member 1, and the cutting edge chain means 2 is extended in an opposed direction f2 of the specific direction f1 from the projected part (h).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pruning chain saw capable of cutting a relatively thick tall branch at a high position that is hard to reach by a cutting blade chain.

[0002]

2. Description of the Related Art There is a high branch cutting chain saw provided with a handle portion at the base of a support rod member having a length of several meters and cutting blade chain means at its front end which is operated by transmitting a rotational driving force. (See, for example, Japanese Patent Application Laid-Open No. 9-252649). In this chain saw, a branch presser bar is fixedly provided in relation to the cutting action portion of the cutting blade chain means,
Further, the cutting blade chain means projects only in a specific direction on the side of the support bar member.

[0003]

In the above-described conventional high-pruning chain saw, the portion of the cutting portion close to the support rod member is a portion where an effective cutting action can be exhibited in the cutting process by the cutting blade chain means. Nevertheless, due to the presence of the branch presser bar, a direct cutting action is not exerted in the branch cutting process, which may impair the efficient use of the cutting chain means. When the cutting action portion is brought into contact with the branch, the support rod member is operated to be erected, but the relatively heavy cutting blade chain means protrudes only in a specific direction of the support rod member, so that the cantilever support acting on the hand The load increases and a lot of labor is required. An object of the present invention is to provide a high-pruning chain saw capable of solving such a problem.

[0004]

In order to achieve the above-mentioned object, in a high-pruning chain saw according to the present invention, as described in claim 1, a handle portion is provided at the base of a support bar member having a length of several meters. In a high-pruning chain saw provided with a cutting blade chain means that operates by transmitting a rotational driving force to a front end thereof, a protruding portion protrudes from a front end portion of a support rod member in a specific direction on a side portion thereof. A part is formed, and the cutting blade chain means is configured to extend from the projecting part in a direction opposite to the specific direction.

[0005] According to this, the projecting portion and the leading end portion of the cutting blade chain means are opposed to each other on the left and right sides of the support bar member. Therefore, when the support bar member is vertically erected, the projecting portion is formed. And the moment generated by the weight of the leading end of the cutting blade chain means cancel each other, so that the support rod member can be easily supported by the operator. Further, the cutting action portion of the cutting blade chain means and the tip of the support bar member intersect, and stable cutting of the branch can be performed without the conventional branch presser bar. The part effectively and directly acts on the branch cutting process.

In the high-pruning chain saw according to the second aspect of the present invention, a handle portion is transmitted to a base portion of a support rod member having a length of several meters and a rotational driving force is transmitted to a front portion thereof. In a high-branch chain saw provided with cutting blade chain means, a protruding portion that protrudes toward a specific direction of a side portion of a support rod member is formed at a tip portion of a support rod member, and the cutting blade chain means is formed from the protruding portion. The cutting action portion of the cutting blade chain means is formed so as to extend in a direction opposite to the specific direction so as to intersect with the support rod member.

According to this, when the cutting action portion of the cutting blade chain means abuts against the upper side surface of the branch and cuts the branch, the cutting reaction force causes the side surface on the branch existing side of the leading end of the support rod member to be cut. The branch is pressed against the branch to be cut, whereby the branch is stably positioned at a tolerance position between the side surface of the front end of the support rod member and the cutting action portion, and is cut smoothly.

The invention of each of the above-mentioned claims can be embodied as follows. That is, as described in claim 3, the projecting portion is configured as a gear case for transmitting power to the cutting blade chain means. According to this, the gear case which is conventionally required is utilized as the overhanging portion, and the benefit of sharing the members can be obtained.

According to a fourth aspect of the present invention, the cutting blade chain means is provided so as to be capable of changing a position around a horizontal axis provided at the projecting portion. In this way, the cutting blade chain means can optimize the posture of the tree branch having various inclined postures, and the operator can easily cut the branches.

According to a fifth aspect of the present invention, there is provided a rotatable support member which is formed integrally with the chain guide plate of the cutting blade chain means and which is rotatable about the horizontal axis. The structure is provided with a supporting state changing operation means for restricting or canceling the rotational displacement of the member about the horizontal axis by manual operation of a handle. According to this, the position change of the cutting blade chain means around the horizontal axis is performed by a simple operation by the operator.

According to a sixth aspect of the present invention, the surface of the support rod member on the side opposite to the specific direction side at the tip end is formed to have an uneven shape in a side view. If you do this,
The uneven surface prevents the branch cut at the intersection of the cutting action part of the cutting blade chain and the tip of the support rod member from sliding down the side surface of the support rod member and is reliably controlled by the uneven surface. And it will be cut smoothly.

Further, a prime mover such as an engine or a motor is fixed to the base of the support rod member,
A stand member that protrudes in the specific direction side of the motor is provided, and the stand member and the protruding portion function to stably stand by itself as a whole. According to this, when the whole is fixed on the ground or the like, the cutting blade chain means does not touch the ground and the sharpness is not reduced.

[0013]

1 to 3 relate to a high branch cutting chain saw according to the present invention. FIG. 1 is an overall side view, FIG. 2 is a plan view showing the periphery of cutting blade chain means, and FIG. 3 is cutting blade chain means. 4 is a side view showing the periphery of FIG.

In these figures, reference numeral 1 denotes a support rod member having a length of several meters, reference numeral 2 denotes a cutting blade chain means provided at a front end of the support rod member 1, and reference numeral 3 denotes a base portion of the support rod member 1 on the base side. A prime mover fixed to the end.

The support rod member 1 has a relatively long main body 1a having a cylindrical shape, and a gear case 1b is formed continuously at the tip of the main body 1a. The handle member 4 is fixed to the part in a cross shape,
Handle portions 5, 5 are formed at both ends of the handle member 4. Further, a shoulder belt 6 is engaged with the support bar member at a position closer to the motor 3 than the handle member 4.

The tip of the support bar member 1 (including the gear case)
The right side surface s is formed into a concave-convex shape g when viewed from the side, and the gear case 1b has a projecting portion h projecting leftward f1 of the support rod member 1.

As shown in FIG. 2 and FIG. 3, the cutting blade chain means 2 has a laterally oriented chain drive shaft 7 as a horizontal axis rotatably mounted at a specific position substantially at the center of the projecting portion h. At the same time, a sprocket 8 is fixed to the chain drive shaft 7, while a rotatable support member 9 is mounted on one side s1 of the gear case 1b so as to be rotatable around the chain drive shaft 7, and a chain is attached to the rotatable support member 9. The guide plate 10 is fixed such that the tip of the guide plate 10 is extended in the right direction f2, and the endless cutting blade chain 11 slidably guided around the periphery of the chain guide plate 10 is wound around the sprocket 8. Configuration.

At this time, the portion of the substantially straight cutting blade chain 11 existing below the chain guide plate 10 and the sprocket 8 forms a cutting action part m. The state has been made.

In the vicinity of the rotatable support member 9 at the protruding portion h, a supporting state changing operation means 12 for restricting or canceling the rotational displacement around the chain drive shaft 7 can be operated by a handle n. When changing the position of the cutting blade chain means 2 around the chain drive shaft 7,
After turning the handle n to the loosening side, the cutting blade chain means 2 together with the rotatable support member 9 can be moved to any position around the chain drive shaft 7 (for example, positions p0, p1, p2, p3,
p4, p5), the position after this movement is held, and the handle n is turned to the tightening side to be operated. Here, the positions p0, p1, p2, p3, p4, p5
Is a position where the center line x of the chain guide plate 10 is located.

The prime mover 3 is an engine, and a stand member 1 is provided near the engine 3 in the same manner as the engine 3.
4 is fixed. The stand member 14 can be folded and stored at a position where there is no problem. 14a is a ground portion of the stand member 14. The prime mover 3 is not limited to an engine, and may be, for example, a motor driven by electricity, liquid pressure, gas pressure, or the like.

The rotation of the prime mover 3 is transmitted to a chain drive shaft 7 of the cutting blade chain means 2 via a transmission mechanism 15. At this time, the transmission mechanism 15 is configured as follows: a straight transmission rotation shaft 16 connected to the output shaft of the prime mover 3 is provided in the inner hole of the support rod member 1; The shaft 16 and the chain drive shaft 7 are placed in the gear case 1b and the worm 17a and the worm wheel 17
b and are interlockingly connected via a transmission gear 17 made of b. It should be noted that the transmission gear 17 may be replaced with a screw gear or a bevel gear instead of a worm gear.

Next, an example of use and operation of the product of the present invention configured as described above will be described. The operator places the cutting blade chain means 2 in an obliquely upward position to ground the specific portion p of the gear case 1b and the grounding portion 14a of the stand member 14, whereby the cutting blade chain 2 is different from that of the present invention. The state that does not come into contact with is stably maintained. The prime mover 3 is started under this state.

Thereafter, as shown in FIG. 4, the shoulder belt 6 is hung on the shoulder, the grip portions 5, 5 are grasped by the left and right hands, the support bar member 1 is further erected, and the cutting blade chain means 2 is moved. The chain guide plate 9 is positioned above the high branch w to be cut, and the posture of the chain guide plate 9 is held so as to be substantially perpendicular to the length direction of the high branch w to be cut. In the erecting operation of the support bar member 1 at this time, the moment generated by the weight of the overhang portion h and the moment generated by the weight of the front end portion of the cutting blade chain means 2 cancel each other, and the operation of the support bar member 1 is performed. The cantilever load acting on the person is reduced.

Next, the cutting blade chain means 2 is slowly lowered by utilizing their own weight, whereby the cutting action portion m comes into contact with the tall branch w to be cut and starts cutting the branch w. . When the cutting is started, the reaction force from the branch w of the cutting blade chain 11 driven in the arrow direction f3 moves the cutting blade chain means 2 in the direction opposite to the arrow direction f3, and the right side surface of the tip of the support bar member 1 is moved. Is pressed against the branch. At this time, the tip of the support rod member 1 tends to further run on the surface of the branch w and run up diagonally upward by the driving force of the cutting blade chain 11. However, since the leading end of the support bar member 1 formed in the irregular shape g regulates the relative displacement with the branch w, this run-up is prevented, and the branch w has a tolerance between the support bar member 1 and the cutting action portion m. It is stably held in place. Thereby, the branch w is reliably and stably cut.

Depending on the state of inclination of the branch w to be cut, cutting may not be performed if the inclination of the cutting blade chain means 2 with respect to the support rod member 1 is in the state shown in FIGS. 1 and 3. In such a case, turn the handle n by hand to
The inclination of the cutting blade chain means 2 with respect to the support bar member 1 is changed.

When the cutting blade chain means 2 is fixed at the position p1 in FIG. 3, the branch w is located between the cutting action portion m of the cutting blade chain means 2 and the support rod member 1, and the product of the present invention is provided. Is hung on the branch w, the branch w is cut off, and the burden of the operator on handling the support bar member 1 is greatly reduced.

Further, the cutting blade chain means 2 is moved to a position p in FIG.
When fixed to 0, the leading end of the cutting blade chain means 2 is positioned so as to face the base of the support rod member 1, so that the entire length of the product of the present invention is shortened, and the cutting chain is excellent. The contact of 11 with other objects is suppressed, and the damage is prevented.

The product of the present invention described above can be modified as follows. That is, a clutch means for interrupting the interlocking connection between the motor 3 and the cutting blade chain means 2 may be provided in the transmission mechanism 15 inside the support rod member 1, and the motor 3 may be connected to the support rod member. 1, the output shaft of the prime mover 3 and the rotary transmission shaft 1
6 may be interlocked via a flexible transmission shaft.

It is also possible to provide an electric motor or a fluid pressure motor at the front end of the support rod member 1 and directly drive the chain drive shaft 7 with these motors. In this case, a power supply line or a fluid pressure supply It is necessary to supply power and power to these motors via lines.

Further, the distance between the handle 5 and the chain drive shaft 7 can be changed and adjusted by making the support rod member 1 and the transmission mechanism 15 extendable and contractible. The height of the cutting blade chain means 2 is optimized for various heights of the tall branches w to be cut, and the handleability of the product of the present invention is improved.

[0031]

According to the present invention described above, the moment caused by the weight of the projecting portion and the moment caused by the weight of the leading end portion of the cutting blade chain means in a state where the support rod member is vertically erected are mutually different. Since they cancel each other, it is possible to easily support the support rod member by the operator, and the cutting action portion of the cutting blade chain means and the tip of the support rod member intersect, and the conventional branch presser bar is used. Even without this, the branch can be stably cut, and the cutting action portion of the cutting blade chain means can be more effectively and directly applied to the branch cutting process than before.

According to the second aspect of the present invention, the branch to be cut can be stably positioned at the tolerance position between the side surface of the front end of the support rod member and the cutting action portion, and the cutting can be performed reliably and smoothly. .

According to the third aspect of the present invention, the gear case, which has been conventionally required, is used as the projecting portion, so that members can be shared.

According to the fourth aspect of the present invention, branches of a standing tree having various inclinations can be cut without difficulty.

According to the fifth aspect of the invention, the position of the cutting edge chain means around the horizontal axis can be quickly changed by a simple operation, and the working efficiency is improved.

According to the sixth aspect of the present invention, the positional displacement of the branch during cutting can be regulated by the uneven surface of the tip of the support rod member, and the branch can be cut reliably and smoothly. .

According to the seventh aspect of the present invention, it is possible to prevent the cutting blade chain means from touching the ground when the whole is fixed on the ground or the like, thereby preventing the sharpness from being lowered.

[Brief description of the drawings]

FIG. 1 is an overall side view of a high-pruning chain saw according to the present invention.

FIG. 2 is a side view showing the vicinity of a cutting blade chain means of the high branch cutting chain saw.

FIG. 3 is a plan view showing the vicinity of a cutting blade chain means of the high branch cutting chain saw.

FIG. 4 is an explanatory view of a use state of the high branch cutting chain saw.

[Explanation of symbols]

 Reference Signs List 1 support rod member 1b gear case 2 cutting blade chain means 3 motor 5 handle 7 chain drive shaft (horizontal axis) 9 rotatable support member 10 chain guide plate 12 support state changing operation means 14 stand member f1 right direction (specific direction) g Unevenness h Overhanging part m Cutting action part n Handle

Claims (7)

[Claims] 1. A high-pruning chain saw provided with a handle at the base of a support bar member having a length of several meters and cutting blade chain means at its front end to be operated by transmitting rotational driving force. Forming a projecting portion projecting toward a specific direction of a side portion of the supporting rod member at a tip portion thereof, and extending the cutting blade chain means from the projecting portion in a direction opposite to the specific direction. High branch cutting chainsaw. 2. A high-pruning chain saw provided with a handle at the base of a support bar member having a length of several meters, and cutting blade chain means at its front end to be operated by transmitting rotational driving force. A protruding portion is formed at the tip of the support rod member so as to protrude in a specific direction on a side thereof, and the cutting blade chain means is extended from the protruding portion in a direction opposite to the specific direction to perform the cutting. A high-pruning chain saw, wherein the cutting action portion of the blade chain means is formed to cross the support bar member. 3. The protruding portion is a gear case for transmitting power to the cutting blade chain means.
Or the high branch cutting saw according to 2. 4. A high-pruning chain saw according to claim 1, wherein the cutting blade chain means is provided so as to be able to change its position around a horizontal axis provided at the projecting portion. 5. A rotatable support member which is formed in the same shape as the chain guide plate of the cutting blade chain means and is rotatable about the horizontal axis, and the rotation of the rotatable support member about the horizontal axis. 5. A high-pruning chain saw according to claim 1, further comprising a support state changing operation means for restricting displacement or releasing the restriction by manual operation of a handle. 6. The tall branch according to claim 1, wherein a surface on a side opposite to the specific direction side at a tip end portion of the support rod member is formed in an uneven shape in a side view. Cutting chain saw. 7. A motor, such as an engine or a motor, is fixed to the base of the support rod member, and a stand member that protrudes in the specific direction side of the motor is provided. 7. The high-branch chain saw according to claim 1, which functions to stably stand by itself.