JP4787623B2 - High altitude saw - Google Patents

Description

  The present invention relates to a saw suitable for cutting a branch of a tree in a high place or a part of a building in a high place.

  As saws for cutting the branches of trees in high places, those with a saw blade attached to the end of a long handle (Patent Literatures 1 to 3), those with a chain saw etc. (Patent Literatures 4 and 5) have been devised. ing. However, because the former is a hand that pushes and pulls a long handle part by hand, for example, when cutting a branch at a high place that exceeds twice the height of a person, the saw blade must be accurately positioned where you want to cut. It is not always easy to apply the force to the saw blade and apply a force to the saw blade so that its position does not shift during cutting. Moreover, when the handle becomes longer, the weight of the saw increases, and the physical burden becomes excessive, so that the work efficiency is lowered. In the latter case, it is necessary to lift a power source such as a motor attached to the blade portion together, which is inherently heavy, so there is a limit to lengthening the handle. Therefore, in order to cut a branch at a considerably high place with a saw that directly lifts the handle by hand (hereinafter referred to as “hand-held saw”), it is necessary to climb a ladder or a stepladder as close as possible to the branch to be cut. Occurs. Such work is not only dangerous but also inefficient.

  As a method that does not require a person to lift the saw handle directly, a unit with a motor and blade is mounted on a strut that can be extended long, and the strut is fixed on a movable holding base such as a carriage. An apparatus (Patent Document 6) has also been devised. This makes it possible to cut fairly tall branches relatively safely. However, it is difficult to accurately align the direction and position of the blade with the place where it is desired to cut, and it is also difficult to move the position of the blade slightly while moving forward. It becomes even more difficult when the holding stand is installed on a ground with many irregularities. In addition, since the apparatus becomes large, it takes time to carry it.

Japanese Patent Laid-Open No. 10-6700 JP 2003-180161 A JP-A-1-171901 JP-A-9-252649 Japanese National Patent Publication No. 2-500466 Japanese Utility Model Publication No. 62-97552

  In recent years, high-altitude branches are left unattended in trees in the city, causing abnormal propagation of pests and birds. Cedar trees are not sufficiently pruned, leading to an increase in cedar pollinosis, which has become a social problem. In a building, the construction of a work floor is expensive, and high-level members that are likely to corrode and fall off are left everywhere, and people and vehicles passing under them are exposed to danger.

Considering safety and work efficiency, a major cause of leaving a tree branch or building member to be cut at a high place is a major cause of costly work such as using an aerial work vehicle or building a scaffold. Is increased.
In view of such a current situation, the present invention is to provide a saw capable of efficiently and simply cutting off a branch or member at a high place by work from a safe ground.

  As a result of various studies by the inventors, the above object is to provide a saw having a saw blade on the upper part of the support bar, and the lower part of the support bar can be held at a fixed position relative to the ground so that the support bar can tilt. The height saw that can be used as a force in the cutting direction (cutting direction) by applying the weight (mass) of the tilting member including the saw blade and the support bar to the workpiece through the saw blade. It is realized by. As the support, for example, a support fixed to the ground or a tree trunk by a support 4 in FIG. 2 or an adjustment table 22 in FIG.

Specifically , the saw blade drive unit or the reciprocating saw is the upper part of the support bar as a high-order saw that is constrained to a constant cutting direction (cutting advance direction) as the cutting progresses and can perform a more stable cutting operation. The lower part of the support bar is positioned relative to the ground so that the support bar is tilted constrained in a plane that forms an angle in the range of 90 ± 45 ° with respect to the horizontal plane. What has a mechanism for attaching to a support that can be held constant is provided. The saw blade is attached to the saw blade drive unit so that the cutting direction is substantially fixed in a direction parallel to the one plane.
“Tilt” means that a rod-like body whose one end is higher than the ground rotates about an axis in a direction substantially perpendicular to the longitudinal direction of the rod-like body (the axis is near the lower end of the rod-like body). This is the case. The “upper part of the support bar” is at least a part above the center of the support bar, and the “lower part of the support bar” is at least a part below the center of the support bar.

  The type in which the reciprocating saw blade is directly attached to the support bar performs a cutting operation by reciprocating together with the support bar. Therefore, as a mechanism for attaching to the support, it is necessary to have a structure in which the support rod can reciprocate. In this case as well, the support bar is attached to the support so that the cutting direction of the saw blade is substantially fixed in a direction parallel to the one plane.

  The saw blade drive unit is a device having a saw blade and a mechanism for driving the saw blade. For example, a saw blade drive unit having a reciprocating type saw blade (hereinafter referred to as “reciprocating saw blade”) includes a saw blade and a piston connected to the saw blade. In this case, the saw blade reciprocates in conjunction with the piston. The piston can be a mechanism that operates when a fluid flows into the cylinder by a pressure supplied from a power source outside the unit.

  More specifically, a piston that operates when fluid flows into the cylinder by pressure supplied from a power source outside the saw blade drive unit, a saw blade that reciprocates in conjunction with the piston, and the piston It is equipped with an elastic body that expands and contracts in conjunction with the fluid, and when pressure is applied from the power source, fluid flows into the cylinder from the flow path connected to the power source and the piston moves `` outward '' and elastically elastic A saw having a mechanism in which when the energy is accumulated and the pressure from the power source is released, the elastic body has the elastic energy that causes the piston to “return” and the fluid that has flowed into the cylinder returns to the flow path. A blade drive unit can be employed.

  Examples of the saw blade drive unit in the case where the saw blade is a chain saw or a rotary blade include a saw blade, a motor for driving the saw blade, and a power transmission mechanism between the motor and the saw blade.

  According to the height saw of the present invention, the weight of the tilting member such as the saw blade and the support bar is added to the workpiece through the saw blade. It became possible to cut the cut material easily. At that time, if the movement of the support bar provided with the saw blade is constrained within a certain plane, the position of the saw blade with respect to the cutting point can be more accurately and easily adjusted, and the progress of the saw blade The direction is constrained to be constant and stable cutting operation can be continued. Especially in the type equipped with the saw blade drive unit, the operator can perform the cutting operation by lightly supporting the support rod, so that the physical burden on the operator is greatly reduced compared to the conventional “hand-held saw”.

  The height saw of the present invention can be cut by one person or a small number of people relatively easily. It is also possible to work in a narrow space where cars cannot enter and on uneven ground. Therefore, this invention contributes to the cutting operation | work of the branch and building member in the high place which was apt to be left until now.

The altitude saw of the present invention has a mechanism for tilting a support bar to which a saw blade or a saw blade drive unit is attached.
FIG. 1 schematically illustrates a configuration of an altitude saw having a saw blade drive unit. A saw blade drive unit 2 is attached to the tip of the support bar 1. The saw blade drive unit 2 includes a saw blade 3 at the tip thereof, and the saw blade 3 is driven by a cylinder and a piston built in the saw blade drive unit 2 and reciprocates (described later). 6). The case where the tree branch 37 is cut by the reciprocating motion of the saw blade 3 is illustrated. The support rod 1 is attached to the ground 5 via, for example, a support base 4 so as to be tiltable. The support 4 is a “support” that can maintain a constant relative position to the ground. As shown in FIG. 1B, the work is performed with the angle Φ formed by the longitudinal direction of the support bar 1 and the horizontal plane 7 being less than 90 ° so that the weight of the tilting member such as a saw blade or the support bar is applied to the workpiece. And by doing so, the force with which the operator presses the saw blade against the workpiece is reduced.

The height saw of the present invention can be provided with a mechanism in which the support rod 1 is restrained in a single plane and tilted. This tiltable plane is referred to herein as a “tilt plane” and is indicated by the reference numeral 6 in FIG. 1A is a view from a direction parallel to the tilting plane 6 and the horizontal plane 7, and FIG. 1B is a direction perpendicular to FIG. 1A (direction A shown in FIG. 1A). Is seen from.
The tilting plane 6 is a plane that forms an angle of θ with respect to the horizontal plane 7. When the high-end saw is used, the tilting plane 6 is fixed to one plane in which θ is in the range of 90 ± 45 °. In other words, the support bar 1 is used in a state where it can be restrained and moved within one tilt plane 6. The support bar 1 is usually attached to the support base 4 or the like with a slight “play” with respect to the tilting plane 6. Therefore, in the present invention, “restrained in the tilt plane” allows a variation range due to “play” in the attachment mechanism of the support rod 1.

  The saw blade 3 is attached to the saw blade drive unit 2 so that the cutting direction (cutting direction) is substantially fixed in a direction parallel to the tilt plane 6. That is, the saw blade 3 reciprocates with respect to the saw blade drive unit 2, but at this time, the direction of the blade does not rotate around the reciprocating motion direction but is fixed in a substantially constant direction. Here, “outline” means that a variation range due to “play” in the mechanism for fixing the direction of the blade is allowed. When the support bar 1 moves while being restrained in the tilt plane 6, the cutting direction is constrained to be constant, and stable cutting work is possible. That is, the operator is released from the control of the cutting direction during the cutting operation, and can perform accurate cutting extremely easily compared with a conventional hand-held saw or the like.

  The support rod 1 may bend slightly. In this case, the tilt plane 6 may be regarded as a plane including a straight line connecting the lower end and the upper end of the support rod 1 and the angle θ may be set. Moreover, what is necessary is just to set the direction of the straight line which connects the lower end and upper end of the support bar 1 as the longitudinal direction of the support bar 1 about the said angle (PHI).

  The angle θ formed by the tilt plane 6 and the horizontal plane 7 is set to an optimum angle according to the state of the workpiece. However, if the angle is too small, the workability deteriorates. Therefore, it is desirable to have a structure that can be fixed within a range of 90 ± 45 °. A structure that can be fixed within a range of 90 ± 30 ° may be used. In particular, when a stable single-person operation is important, a structure that can be fixed within a range of 90 ± 20 ° is effective.

  FIG. 2 schematically illustrates a mechanism for attaching the support rod 1 to the support base 4 as a “support” for the high-end saw of the type shown in FIG. 2 (a) and 2 (b) are views seen from directions corresponding to FIGS. 1 (a) and 1 (b), respectively. The support 4 is fixed to the ground 5 by an anchor 8, for example. In addition, when the support base 4 has a mass and a size that are sufficiently large relative to the mass of the entire height saw, a “support” that can maintain a constant position relative to the ground simply by placing the support base 4 on the ground. Function as. A fixed bearing 9 is attached to the support base 4, and a support rod mounting jig 11 having a shaft 38 can be fixed to the horizontal plane 7 at an angle θ by tightening the fixing screw 10. The angle θ can be adjusted in the range of 90 ± 45 °. The support rod 1 is attached to the support rod attachment jig 11 via pins 12. The support rod 1 can be tilted about the pin 12 as an axis. At this time, the support rod 1 can be restrained and tilted within the plane of the tilt plane 6 that forms an angle θ with respect to the horizontal plane 7.

  FIG. 3 schematically illustrates the structure of an altitude saw of the type in which a reciprocating saw blade 13 is fixed to the upper end of a support rod 1 that reciprocates. The support rod 1 is formed of a hollow pipe at least near the lower end. A guide bar 14 is attached to the support base 4, which is a “support”, so that it can be tilted while being restrained within the tilt plane 6. For example, a mechanism similar to that shown in FIG. The support rod 1 is attached to the support base 4 by inserting a guide rod 14 into the hollow portion thereof, and can be tilted together with the guide rod 14 by being restrained in the tilt plane 6. The support bar 1 can reciprocate in the longitudinal direction indicated by the arrow in FIG. Further, a rotation preventing mechanism is provided so that the support bar 1 does not rotate around the guide bar 14 as an axis. That is, the direction in which the blade advances is roughly fixed in a direction parallel to the tilt plane 6. In this type of height saw, an operator cuts the workpiece 34 by reciprocating the support rod 1. At that time, the operation of the reciprocating saw blade 13 is constrained within the tilting plane 6, so that the workpiece 34 can be advanced in a fixed direction. If the angle θ between the tilt plane 6 and the horizontal plane 7 is set in the range of 90 ± 20 °, the operation is easy, and it is more preferable to set the angle θ in the range of 90 ± 15 °. FIG. 3 shows an example in which θ = 90−15 ° = 75 °. In addition, when the contact of the support bar 1 and the guide bar 14 is performed via the bearing, the operation of the support bar 1 becomes smoother.

  In FIG. 4, the reciprocating saw blade 13 is fixed to the upper end of the support rod 1 that reciprocates similarly to FIG. 3, but the lower end vicinity of the support rod 1 is inserted into the hollow pipe-shaped guide sheath 16. Fig. 3 schematically illustrates the structure of a type of height saw. A guide sheath 16 is attached to the support base 4 so as to be restrained within the tilt plane 6 and tilted. For example, a mechanism similar to that shown in FIG. The support rod 1 is attached to the support base 4 by inserting the vicinity of the lower end thereof into the guide sheath 16, and can be tilted together with the guide sheath 16 within the tilt plane 6, and can be tilted along the guide sheath 16. It can reciprocate in the longitudinal direction. Further, an anti-rotation mechanism is provided so that the support rod 1 does not rotate around the guide sheath 16. That is, the direction in which the blade advances is roughly fixed in a direction parallel to the tilt plane 6. As in the type shown in FIG. 3, the height saw can reciprocate the workpiece 34 in a certain direction by the operator reciprocating the support rod 1. In this case as well, the angle θ formed by the tilt plane 6 and the horizontal plane 7 is easy to work when set in the range of 90 ± 20 °, and more preferably set in the range of 90 ± 15 °. FIG. 4 shows an example in which θ = 90−15 ° = 75 °. If the contact between the support bar 1 and the guide sheath 16 is performed via a bearing, the operation of the support bar 1 becomes smoother.

  FIG. 5 schematically illustrates a mechanism for attaching an altitude saw support rod to a tree trunk. FIG. 5A is a diagram viewed from a direction perpendicular to the horizontal plane, and FIG. 5B is a diagram viewed from a direction parallel to the horizontal plane. In this example, an adjustment base 22 that functions as a “support” is fixed around the tree trunk 21, and the support bar 1 is attached to the adjustment base 22 using a groove 23 provided on the upper surface of the adjustment base 22. It is. The adjusting base 22 is divided into an α member and a β member, and both members are fastened with bolts and nuts (not shown) with the tree trunk 21 sandwiched in the center, and a spike 27 is further attached to the tree trunk 21. And screw it into the tree.

  Since the groove 23 is formed in a circumferential shape around the tree trunk 21, once the adjustment stand 22 is fixed to the tree trunk 21, the support bar 1 is placed at an arbitrary position around the tree trunk 21. Can be attached. As a mounting method, for example, the ball head jig 24 is screwed into the groove 23 with a nut through a washer 26. A ball head jig 24 having a mechanism similar to that of a free pan head used when fixing the camera to a tripod can be used, and a head fitting 25 is provided at a portion corresponding to the pan head. By attaching the vicinity of the lower end of the support bar 1 to the head fitting 25 via the pin 12, the support bar 1 can be tilted about the pin 12. By tightening the fixing screw 10 of the ball head jig 24, the head fitting 25 can be fixed at a predetermined inclination angle, and the support bar 1 is tilted with respect to the horizontal plane 7 at an angle θ (θ is 90 ± 45 °). It can be tilted in the plane 6.

  An altitude saw having the structure shown in FIG. In this high-end saw, the saw blade drive unit 2 is fixed to the upper portion of the support rod 1, and the saw blade 3 reciprocates in the direction indicated by the arrow in the drawing by the operation of the piston 29. The saw blade drive unit 2 is provided with a mechanism that prevents the saw blade 3 from rotating about its reciprocating motion direction. The support rod 1 was made of carbon fiber used for fishing rods, and a multi-stage pipe member was extended to a length of about 12 m. The piston 29 is driven by air pressure. A tube 31 is connected to the cylinder 30 of the saw blade drive unit 2, and the tube 31 is connected to a pump 32 which is a power source. These are filled with air as a fluid. Oil can be used as the fluid, but it is preferable to use gas because it has viscosity. When the operator 33 applies pressure to the pump 32 in a stepping manner, air flows into the cylinder 30 from the tube 31 and the piston 29 moves “forward”, and the saw blade 3 that moves in conjunction with it moves the workpiece to be cut. proceed. At the same time, the spring 35 provided in the saw blade drive unit 2 is contracted by the “forward” movement of the piston 29, and elastic energy is accumulated in the spring 35. Next, when the pressure applied to the pump 32 by the operator 33 is released, the spring 35 is stretched by its elastic energy to cause the piston 29 and the saw blade 3 to “return”, and the air in the cylinder 30 returns to the tube 31. The pump 32 also returns to the state before applying pressure. The tube 31 is built in the pipe of the support rod 1.

  In this high-end saw, the saw blade 3 is moved once by one operation of the operator 33 depressing the pump 32, and a cutting force is generated in the saw blade 3. Therefore, the type of saw blade 3 that can be cut when pressed is attached. If a saw blade that can be cut when pulled is used, it may be attached in the reverse direction as shown in FIG. 6 (a), the movement direction of the saw blade 3 is substantially parallel to the length direction of the support bar 1, but if a mechanism for changing the mounting angle between the support bar 1 and the saw blade drive unit 2 is used. The saw blade movement direction can be adjusted according to the mode of use. Various gases can be used as a power transmission medium (fluid) between the pump 32 and the cylinder 30, but air (including compressed air) is most easily used.

  The support rod 1 is attached to the support base 4 by a jig 36 at the lower end. The jig 36 has a mechanism capable of tilting the support rod 1 by restraining the support rod 1 within a tilt plane that forms an arbitrary angle with respect to the horizontal plane. The support base 4 was fixed to the ground 5 by an anchor 8.

This height saw was used for cutting a tree branch 37 at a height of about 12 m. The tilt plane was fixed so that the angle θ with respect to the ground was about 90-15 ° = 75 °, and the saw blade 3 was made to contact the tree branch 37, which was the object to be cut, almost perpendicularly. The angle Φ formed by the ground 5 and the support bar 1 in the tilt plane was set to about 80 ° at the time of starting cutting. Using the weight of the support bar 1 and the saw blade drive unit 2, the saw blade 3 was cut while leaning against a tree branch 37 as an object to be cut. The worker 33 cuts the tree branch 37 in a direction substantially perpendicular to the length direction by repeating the operation of stepping on the pump 32 with his / her foot while gently supporting the support rod 1 with his / her hand. Since the saw blade 3 does not rotate around the axis in the reciprocating motion direction and is tilted while being constrained within the tilt plane, it can be easily and accurately cut by one person.

The figure which illustrated typically the composition of the height saw of the type which has a saw blade drive unit. The figure which illustrated typically the mechanism which attaches a support bar to a support body about the height saw of the type of FIG. The figure which illustrated typically the structure of the height saw of the type in which the reciprocating saw blade is being fixed to the upper end of the reciprocating support rod, and the support rod is attached to the support body via the guide rod. The figure which illustrated typically the structure of the height saw of the type in which the reciprocating saw blade is being fixed to the upper end of the support rod which reciprocates, and the support rod is attached to the support body via the guide sheath. The figure which illustrated typically the mechanism which attaches the support bar of an altitude saw to the trunk of a tree. The figure which showed typically the structure of the height saw used in the Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support rod 2 Saw blade drive unit 3 Saw blade 4 Support stand 5 Ground 6 Tilt plane 7 Horizontal surface 8 Anchor 9 Fixed bearing 10 Fixing screw 11 Support rod attachment jig 12 Pin 13 Reciprocating motion saw blade 14 Guide rod 16 Guide sheath 21 Tree 22 Adjusting base 23 Groove 24 Ball head jig 25 Head fitting 26 Washer 27 Spike 29 Piston 30 Cylinder 31 Tube 32 Pump 33 Worker 34 Object to be cut 35 Spring 36 Jig 37 Tree branch 38 Axis

Claims (4)

  In a saw in which the saw blade drive unit is attached to the upper portion of the support rod, the support rod is constrained in a plane that forms an angle in the range of 90 ± 45 ° with respect to the horizontal plane so that the support rod tilts. An altitude saw having a mechanism for attaching a lower part to a support that can hold a fixed position relative to the ground. The saw blade drive unit includes a piston that operates when fluid flows into a cylinder by a pressure supplied from a power source outside the unit, and a saw blade that reciprocates in conjunction with the piston. Item 4. The height saw according to item 1 . A saw blade drive unit includes a piston that operates when fluid flows into a cylinder by pressure supplied from a power source outside the unit, a saw blade that reciprocates in conjunction with the piston, and a piston that operates in conjunction with the piston. It is equipped with an elastic body that expands and contracts, and when pressure is applied from the power source, fluid flows into the cylinder from the flow path connected to the power source and the piston moves `` outward '' and elastic energy is accumulated in the elastic body 2. A mechanism according to claim 1 , wherein when the pressure from the power source is relaxed, the piston makes a “return” movement by using elastic energy of the elastic body and the fluid flowing into the cylinder returns to the flow path. Altitude saw as described.   In a saw in which a reciprocating saw blade is attached to the upper part of a support bar, the support bar is restrained and tilted in a plane that forms an angle in a range of 90 ± 45 ° with respect to a horizontal plane, and the support bar is An altitude saw comprising a mechanism for attaching a lower portion of the support bar to a support body that can maintain a constant position with respect to the ground so that it can reciprocate in the longitudinal direction.

Images