JPH09149736A - Impact working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operating efficiency of desired impact operations by enabling the simple practice of the operations to push down an impact working machine with a weak force. SOLUTION: This impact working machine comprises a tool 2 for impact operations provided at the tip, an impact working machine body part 1 capable of applying an impact force to the tool 2 for the impact operations so as to reciprocate the tool 2 for the impact operations in the front and rear directions thereof and one or plural handle parts (6a) and (6b) installed in the upper part of the impact working machine body part 1. A foothold part 8 for placing a foot of an operator so as to push down the impact working machine body part 1 is installed in a position at a lower level than those of the handle parts (6a) and (6b).

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention provides a desired impact work tool with an impact force accompanied by a reciprocating motion, for example, for cutting a root extending into the ground of a tree, for excavating the ground, or for other uses. The present invention relates to an impact working machine used for.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of impact working machine, the applicant of the present application has previously proposed a rooting machine disclosed in JP-A-7-95827. This conventional rooting machine
The impact force generated in the impact work machine main body is applied to the root cutting tool attached to the tip of the impact work machine main body, and the tool is reciprocally moved in the front-rear direction.
The tool reciprocates to facilitate the cutting work of tree roots.

Further, the conventional rooting machine described above is provided with two grips at the upper part of the main body of the impact working machine, and the operator grasps these grips with both hands and the entire impact working machine. Was configured to perform a desired root cutting work while supporting the.

[0004]

However, in the above-mentioned conventional root-cutting machine, the operator can only handle the entire root-cutting machine by gripping the grip portion, and in performing the actual root-cutting work. , Had the following inconveniences.

That is, the roots of the tree are bent in various ways. For example, as shown in FIG. 5, the root 98 of the tree T to be cut floats above the excavated ground 99. There may be a gap S below the root 98. In such a case, when the root cutting tool 2e of the impact working machine is brought into contact with the root 98, the tool 2
In many cases, the root 98 vibrates vertically along with e. In this case, the reciprocating motion of the tool 2e can be effectively used, and the cutting edge of the tool 2e cannot be efficiently cut into the root 98, which makes root cutting difficult. Therefore, conventionally, in the above-mentioned case, the worker applies a force to the grip portion of the impact work machine to push down the impact work machine,
The impact working machine was driven while the root 98 was pressed against the ground 99.

However, in order for the worker to push down the impact working machine with both hands in this way, a strong arm force is required, and the degree of fatigue of the worker becomes great. Therefore, conventionally,
There was still room for improvement in terms of workability.

Incidentally, such a difficulty has occurred not only in the case of the root cutting work described above, but also in the case of excavating the ground using an impact working machine such as a breaker. That is, when excavating the ground, etc., when the ground is hard, it may be desired to push down the impact working machine with a strong force, but conventionally, in such a case, inconvenience still occurred.

The present invention has been devised under such circumstances, and enables the work of pushing down the impact working machine to be easily performed with a weak force, and thus the work of the desired impact work. The goal is to improve the sex.

[0009]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

That is, the invention of the present application is an impact working machine having an impact working tool at its tip and applying an impact force to the impact working tool so as to reciprocate the impact working tool in the front-rear direction. A shock working machine having a main body and one or a plurality of grips provided on an upper part of the shock working machine main body, wherein the shock working machine main body is provided at a position lower than the grip. It is characterized in that a foot rest portion is provided on which an operator places his / her foot so as to push down the impact working machine main body portion.

As the impact work tool, for example, a root cutting tool having a plate-shaped blade portion at its tip can be used. In this case, the impact working machine according to the present invention is configured as a root cutting machine.

According to the present invention, when it is necessary to strongly push down the impact work machine in a state where the impact work machine is erected and used, the foot rest provided on the main body of the impact work machine. It suffices for the worker to place one foot and step on the footrest so as to apply the weight of the worker.
That is, for example, in the case of cutting the root of a tree using an impact working machine configured as a root cutting machine, when the root of the tree is in a state of floating from the ground, the impact work tool is brought into contact with the root of the tree. In this state, the operator puts one foot on the footrest and depresses it, so that the root of the tree can be easily pressed against the ground, and the root of the tree can be easily cut.

As described above, according to the present invention, the impact work machine can be pushed down by utilizing the force or weight of the worker's foot, and unlike the conventional art, the worker can use the arm having the handle portion. It is not necessary to apply a large force, and the impact work machine can be pushed down easily. Further, since the foot rest is provided below the handle, the operation of placing the foot on the foot rest can be easily performed. Therefore, according to the present invention, it is possible to reduce the fatigue level when performing a desired work using the impact work machine, and to obtain the special effect that the workability of various impact work can be improved.

In a preferred embodiment of the present invention, the footrest portion is formed by attaching a bar-shaped member to a side surface portion of the impact working machine main body so as to project in a substantially horizontal direction. can do.

According to this structure, the operator can properly step on the bar-shaped member projecting in a substantially horizontal direction from the side surface of the impact working machine main body with one foot and can properly step on the foot. Since the section is configured by attaching a bar-shaped member to the impact working machine main body section, the configuration is simple and the manufacturing process can be easily performed.

In another preferred embodiment of the present invention,
The impact working machine main body portion, a holding means for slidably holding the rear end side of the shaft-like shank portion of the impact working tool,
A rotary hammer portion having a striking body for striking the shank portion held by the holding means in the distal end side direction, and the striking body interrupts the shank portion in the distal end side direction. The striking body is repeatedly contacted and separated from the hitting surface of the rear end portion of the shank portion or an auxiliary member provided in contact with or connected to the rear end portion of the shank portion so as to strike and press the striking member. It is also possible to adopt a configuration in which the structure is provided so as to be rotatable along a direction facing the hit surface.

According to this structure, the impact body of the rotary hammer part is slidably held on the rear end side of the shank part of the impact work tool with respect to the holding means of the impact work machine main body part. Is swung along a direction facing the rear end portion of the shank portion or the striking surface of the auxiliary member connected or connected to the rear end portion, the striking body moves the shank portion toward the tip side. The contact and the separation from the hit surface are repeated so as to hit and push intermittently. As a result, the impact work tool has
Impact force accompanied by reciprocating motion required for impact work is applied.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a perspective view showing an example of an impact working machine according to the present invention. FIG. 2 is a sectional view of the main part.
FIG. 3 is a sectional view taken along line XX of FIG.

In FIG. 1, the impact working machine includes a root cutting tool 2 as an example of the impact working tool, a main body 1 of the impact working machine having the root cutting tool 2 attached to a tip thereof, and the impact working machine. It is configured to include two grip portions 6a and 6b provided on an upper portion (right side portion in FIG. 1) of the main body portion 1 and a footrest portion 8 provided on a lower side of the impact working machine main body portion 1. There is.

The root cutting tool 2 is made of a hard material such as carbon tool steel, and has a thin plate-like blade having a certain width on the tip side of a shaft-shaped shank portion 20 formed to have a predetermined length. The part 21 is formed. This plate-shaped blade 21
The tip has a sharp shape suitable for cutting the roots of trees.

The impact working machine main body 1 includes a holder portion 3 for detachably holding the shank portion 20 of the root cutting tool 2, and a rotary hammer for imparting a striking force to the root cutting tool 2. The rotary hammer portion 4 is provided with a portion 4 and an engine 5 for applying a driving force to the rotary hammer portion 4.

The holder portion 3 is, as shown in FIG.
The shank portion 20 of the root cutting tool 2 has a through hole 30 for slidably inserting the rear end portion side thereof. The holder portion 3 is provided with a stopper 31 protruding inward from the inner peripheral wall surface of the through hole 30, and the stopper 31 is formed on the outer peripheral surface of the shank portion 20 along the axial direction thereof. It is arranged so as to engage with the key groove-shaped recess 26. As a result, the root cutting tool 2
The shank portion 20 is designed to prevent its removal and rotation, and can reciprocate along its front-rear direction (direction of arrow a) by a dimension substantially similar to the length of the recess 26.

An auxiliary shank 27 as an auxiliary member is provided on the rear end side of the shank portion 20. The auxiliary shank 27 is slidably inserted and held in a bush 71 mounted in a housing part 70 that supports the holder part 3, and a hit surface hit by a hitting body 40 described later. 28 on the tip surface. That is, the hit surface 28 of the auxiliary shank 27 is the hit body 4
When hit by 0 in the direction of the arrow b, this hitting force is transmitted to the shank portion 20 of the root cutting tool 2 via the auxiliary shank 27. A collar portion 27a is formed on the outer periphery of the rear end portion of the auxiliary shank 27 so as to be able to contact the stepped portion 71a of the bush 71. Due to this contact, the auxiliary shank 27 has a certain size or more in the direction of arrow c. It is designed not to retreat.

The hit surface 2 of the auxiliary shank 27
A buffer hole 29 is formed at the position 8 along the axial direction of the auxiliary shank 27. The buffer hole 29 is provided to reduce the contact area between the hit surface 28 and the hit surface 28 when it is hit by the hit body 40. The formation of the buffer hole 29 allows the hit body 4 to hit the hit surface 28.
It is possible to appropriately prevent the temperature of these parts from becoming high even when the strike of 0 is repeated.

The impact working machine according to this embodiment does not have a structure in which the shank portion 20 of the root cutting tool 2 is directly hit by the hitting body 40, but the hit surface 28 of the auxiliary shank 27.
It has a structure in which the hitting body 40 is hit. Therefore, the shank portion 2 is not connected to the shank portion 2 via the auxiliary shank 27 without adversely affecting the rotation stop state of the shank portion 20.
It is possible to appropriately apply an impact force to 0. However, the present invention is not limited to this, and for example, without providing the auxiliary shank 27, the rear end portion 20a of the shank portion 20 serves as a hit surface, and the rear end portion 2 of the shank portion 20 is used.
0a may be directly hit by the hitting body 40. When the auxiliary shank 27 is provided, the auxiliary shank 27 is connected to the shank portion 20 as described above.
The auxiliary shank 27 may be connected to the shank portion 20 instead of being brought into contact with the rear end portion 20a.

The rotary hammer portion 4 has a flat hollow cylindrical housing case 41 in which a hammer 40 is hit.
The rotor 42 for holding the rotor is rotatably provided. The rotor 42 includes two disc-shaped flange portions 4
4a and 44b are connected to each other via a columnar connecting portion 44c, and shaft portions 42a and 42b projecting outside the respective flange portions 44a and 44b have bearings 43 and 4b.
3 supported. Further, the bevel gear 43 attached to the one shaft portion 42 a is meshed with the bevel gear 51 attached to the drive shaft 50. The drive shaft 50 is rotated by driving the engine 5. Therefore, when the engine 5 is driven, its rotational force is transmitted from the drive shaft 50 to the rotor 42, and the rotor 42 is driven and rotated about the shaft portions 42a and 42b.

The hitting body 40 is formed separately from the rotor 42 and has, for example, a columnar shape, and is fitted into holding holes 45, 45 formed in the flange portions 44a, 44b of the rotor 42. Is held. As shown in FIG. 3, the holding hole 45 is formed in an oval shape in which the minimum curvature of the inner surface matches the curvature of the circumference of the hitting body 40. Therefore, the hitting body 40 is configured to rotate with the drive rotation of the rotor 42 in a state where both ends are restrained by the holding holes 45, 45. Further, during the turning operation, the hitting body 40 is displaced to the outside of the holding hole 45 by the turning centrifugal force. The connecting portion 44c of the rotor 42 serves as a balance weight for the hitting body 40.

When the hitting body 40 turns along with the rotation of the rotor 42, the hitting body 40 turns along the direction facing the hit surface 28 of the auxiliary shank 27, whereby the hitting body 40 moves. The outer peripheral surface is set to repeat contact and separation with respect to the hitting surface 28. That is, in FIG. 3, when the hitting body 40 turns in the direction of the arrow d from the position indicated by the symbol A, the hitting body 40 contacts the hit surface 28 of the auxiliary shank 27, and this contact state is maintained for a certain period. .

During the period in which the hitting body 40 and the hitting surface 28 are kept in contact with each other, the hitting body 40 loosely fitted in the holding hole 45 is contact-rubbed with the hitting surface 28. While being rotated in the direction of arrow e, this hitting surface 28
Will be pushed in the direction of arrow b, and the auxiliary shank 27 will continue to be pushed. Then, after the auxiliary shank 27 is pushed by a certain stroke, the hitting body 40 is separated from the hit surface 28. This impact work machine 1
Then, as described above, the auxiliary shank 27 is hit by the hitting body 40 so as to be intermittently pushed, so that the shank portion 20 performs the same operation as the auxiliary shank 27, whereby the root cutting tool 2 An impact force that causes a reciprocating motion is applied to the.

In FIG. 1, the engine speed of the engine 5 can be arbitrarily adjusted by operating a throttle lever 51 provided on a handle 6b. Further, the portions where the handle portions 6a and 6b are provided and the rotary hammer portion 4 are connected to each other through a buffer spring 52 or the like, and the vibration of the rotor hammer portion 4 causes each handle portion 6 to vibrate.
It is structured so as not to be directly transmitted to a and 6b.

The foot rest portion 8 is provided below the two grip portions 6a and 6b of the impact working machine body 1 (on the tip side of the impact working machine body 1), and for example, the holder portion 3 is provided. It is formed by attaching the bar-shaped member 80 to the side surface of the. The bar-shaped member 80 is attached so as to protrude in a substantially horizontal direction from the side surface portion of the holder portion 3 by an appropriate dimension (for example, about ten and several cm) when the impact working machine is erected. As a means for attaching the bar-shaped member 80, for example, as shown in FIG. 3, a means such as screwing a screw portion 81 provided at the tip end thereof into the screw hole 32 of the holder portion 3 is adopted. The member 80 is attachable to and detachable from the holder portion 3. The bar-shaped member 80 may be a simple bar-shaped member made of metal, but a treatment such as rubber lining to prevent slipping when an operator puts his / her foot on the surface of the bar-shaped member 80 is required. You may give it suitably.

Next, a usage example and an operation of the impact working machine having the above-mentioned structure will be described.

For example, as shown in FIG. 4, when the root 98 of the tree T is cut by using the above-mentioned impact working machine, first, the operator grips the two grip portions 6a and 6b with both hands to make an impact. Support work equipment. Then, by driving the above-mentioned drive mechanism of the impact working machine body 1 to generate an impact force for reciprocating the root cutting tool 2, the cutting edge of the tip of the root cutting tool 2 is cut into the tree T. You can press it against the root 98.

Further, in the case of performing such root cutting, the root 98 to be cut may be in a state of being lifted from the ground. Therefore, in such a case, the operator may place one foot on the footrest portion 8 and step on it. In this way, the impact working machine can be pushed down and the root 98 to be cut can be pressed against the ground without applying extra force to both hands holding the grip portions 6a and 6b. Therefore, in such a state, the root 98 can be prevented from reciprocating together with the root cutting tool 2, and the root 98 can be quickly cut. Since the operator only has to put one foot on the footrest portion 8, the degree of fatigue is very small.

In the above embodiment, the footrest portion 8 is provided on the holder portion 3 of the impact working machine body portion 1, but the invention of the present application is not limited to this. In the present invention, the point is that the foot rest 8 should be provided at a position below the one or more grips of the impact working machine main body 1. In addition, in the above-described embodiment, the foot rest portion 8 is configured by the bar-shaped member 80, but the present invention is not limited to this, and the foot rest portion may be formed by a member other than the bar-like member (for example, a plate-like member). May be configured. The footrest may be provided in at least one place, but may be provided in a plurality of places. Furthermore, if the foot rest 8 can be attached to and detached from the impact working machine main body 1, it is convenient and convenient to handle the impact working machine, but is not limited to this. For example, the bar-shaped member may be welded to the impact working machine main body 1 so as to be provided in a state in which it is difficult to remove.

In the above embodiment, the root cutting tool 2 is used as a concrete example of the impact tool, and the root cutting operation of the tree is performed as an example. However, the present invention is not limited to this. The impact work machine according to the invention of the present application, as impact work other than the above-mentioned, various work such as cutting work of a cutting target different from roots of plants such as trees, peeling of P tile adhered to the floor surface, and the like. It can also be used for separating objects, excavating the ground, and crushing concrete. As a matter of course, as the impact work tool, a tool suitable for the work application may be used, and its specific shape and material are not limited.

Besides, the concrete constitution of each part of the impact working machine according to the present invention is not limited to that of the above-mentioned embodiment, and the concrete constitution of each part can be variously changed in design.
In the present invention, it is needless to say that the impact working machine main body may have a structure or principle similar to that of a conventional existing electric hammer, a compressed air type breaker, or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an impact working machine according to the present invention.

FIG. 2 is a cross-sectional view showing a main part of the impact working machine shown in FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a perspective view showing an example of a usage state of the impact working machine according to the present invention.

FIG. 5 is an explanatory diagram showing an example of conventional root cutting work.

[Explanation of symbols]

 1 Impact Working Machine Main Body 2 Root Cutting Tool (Impact Working Tool) 3 Holder Part (Holding Means) 4 Rotary Hammer Part 6, 6a Handle Part 8 Footrest Part 20 Shank Part 21 Plate Blade Part 27 Auxiliary Shank (Auxiliary) 28) Hit surface 40 Hit body 80 Bar-shaped member

Claims (4)

[Claims] 1. An impact work machine main body portion having an impact work tool at a tip portion thereof, and imparting an impact force to the impact work tool so as to reciprocate the impact work tool in the front-rear direction. An impact work machine having one or a plurality of grips provided on an upper part of the impact work machine body, wherein the impact work is provided at a position of the impact work machine body below the grips. An impact working machine characterized in that a foot rest is provided for a worker to put his / her foot so as to push down the machine body. 2. The impact work according to claim 1, wherein the footrest portion is formed by attaching a bar-shaped member to a side surface portion of the impact work machine main body portion so as to protrude in a substantially horizontal direction. Machine. 3. The impact work machine according to claim 1, wherein the impact work tool is a root cutting tool having a plate-shaped blade portion at a tip end portion thereof. 4. The main body of the impact working machine comprises a holding means for slidably holding a rear end side of a shaft-shaped shank portion of the impact working tool, and a shank portion held by the holding means. A rotary hammer portion having a striking body for striking in the front end side direction, and the rotary hammer portion such that the striking body intermittently strikes and presses the shank portion in the front end side direction. In order to repeat contact and separation of the rear end of the part or the auxiliary member provided in contact with or connected to the rear end with respect to the hit surface,
The impact working machine according to any one of claims 1 to 3, wherein the hitting body is provided so as to be rotatable along a direction facing the hit surface.