JPS598522B2 - Chainsaw support mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mechanism for supporting a chainsaw for felling a standing tree, and in particular, the present invention relates to a mechanism for supporting a chainsaw for felling a standing tree, and in particular, a receptacle is formed in a standing tree to be felled so that the final ends of the diagonal cut and the horizontal cut coincide with each other. The present invention relates to a support mechanism for a chainsaw that can be formed as follows.

Chainsaws are used to cut down standing trees, but
The vibrations generated by chainsaws during work often cause workers to develop white wax, which has become a serious occupational disease.

To prevent this, various support mechanisms for chainsaws have been developed in order to prevent the vibrations of the chainsaw from being transmitted to the operator.

However, although these conventional support mechanisms can prevent the vibrations of the chainsaw from being transmitted to the operator,
It has been impossible to form a socket in a tree to be felled so that the final ends of the diagonal cut and the horizontal cut coincide with each other.

If the final edges of the diagonal cut and the horizontal cut at the socket are not made to match, when cutting down a standing tree by forming a trailing cut, the direction in which the tree falls will deviate from the planned direction of the socket. This is extremely dangerous for workers.

In order to form a socket in tree felling work using a chainsaw using a conventional support mechanism, first, the cut angle of the socket (usually 30 to 40 degrees with respect to the horizontal plane) is determined.
A diagonal cut is made by placing the chainsaw in an inclined position to make an angle corresponding to I was doing it.

The fact that the above-mentioned lowering operation of the chainsaw is performed by the operator's visual sense is the reason why the final ends of each cut of the socket do not match.

SUMMARY OF THE INVENTION An object of the present invention is to provide a support mechanism for a chainsaw in which a socket can be formed at a desired cutting angle and the final ends of each cut can be formed to coincide with each other. The chainsaw holder is connected to a suitable rotation mechanism and is supported by a guide part formed on a suitable support member so as to be guided by the guide part and move in an arc shape, and the movement locus formed by the guide part is A positioning portion is provided on the guide portion to position and fix the chainsaw holder at two locations on an arc at which the center angle is equal to the cutting angle of the socket to be formed in the tree to be felled, and the support member is felled. While being attached to a fixing member that is fixed to a tree to be felled, the chainsaw holder is configured so that the cutting edge line of the cutting blade of the chainsaw can be held so as to pass through the center of the arc.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

Reference numeral 1 denotes a fixing stand, which is positioned at the lower side of the cutting point of the tree to be felled and fixed with a driving bolt (not shown).

Reference numeral 2 denotes an adjustment plate screwed onto the fixed base 1, and a bolt 4 that engages with a circular arc hole (not shown) formed in a side plate 3 fixed to the fixed base 1 is tightened by a protrusion 5 thereof. By being fixed, the mounting angle in the vertical direction with respect to the fixing base 1 can be freely adjusted in accordance with the engagement position of the bolt 4 with the circular arc hole.

Reference numeral 6 denotes a mounting rod, which corresponds to the engagement position of the bolt 8 and the circular arc hole 7 by tightening and fixing the bolt 8 that engages with the circular arc hole 7 provided in the adjustment plate 2. The mounting angle in the horizontal direction with respect to the fixed base 1 is adjustable.

The fixing base 1, the adjusting plate 2, and the mounting rod 6 constitute a fixing member.

Reference numeral 9 denotes a rectangular cylindrical sliding frame that is slidably fitted onto the mounting rod 6, and can be fixed at a desired position on the mounting rod 6 by tightening bolts 10.

Reference numeral 11 denotes a curved arm whose end is fixed to one side of the sliding frame 9, and whose other end is fixed to the outer peripheral surface of the cylindrical support frame 12.

Reference numeral 13 denotes a support shaft which is supported by the support frame 12 so as to be able to rise and fall and rotate freely, and which is fixed at a desired height position with a bolt 14. A plate-shaped guide portion 15 is provided on the upper part of the support shaft.
is integrally extended, and an arc-shaped guide hole 16 is provided therethrough.

17 is an index carved on the circumferential surface of the support shaft 130;
By locating the guide portion 15 in correspondence with a desired scale 18 carved on the upper edge of the support frame 12, the guide portion 15 is positioned at a desired angle in the horizontal direction with respect to the tree to be felled. Can be done.

Reference numerals 19 and 20 indicate indicators as positioning parts carved on the upper surface of the guide part 15, and as shown in FIG. The central angle α of the arc l formed by two straight lines m and n passing through 19.20 is an angle equal to the cutting angle of the socket formed in the tree to be felled, for example
It is set to the degree.

The indicator 19 is located on a vertical line passing through the center O of the arc l.

Note that the support rod 12 and the support shaft 13 constitute a support member.

Reference numeral 21 denotes a gear case in which a gear mechanism (not shown) serving as a suitable rotating mechanism is housed. A part of the gear mechanism protrudes from the upper surface of the gear case, and one gear 23 of the chainsaw holder 22 engages with this protrusion. be done.

In addition to the gear 23, another symmetrically located gear 24 is attached to the chainsaw holder 22. (However, gear 24
(not shown), the installation position is the last remaining member of the standing tree to be torn off when it is cut down,
Fine adjustments can be made to adjust the size and width of the so-called "vines."

Reference numeral 26 denotes a chainsaw mounting portion provided on the chainsaw holder 22, and includes a through hole 2 for fixing the chainsaw. , 28 are provided transparently.

Reference numeral 29 is a generally L-shaped moving body, one end of which is fixed to the gear case 21, and the other end of which is provided with a protruding shaft (not shown) with a male thread cut into the tip. The protruding shaft passes through the guide hole 16 of the guide portion 15, and is fixed to the guide portion 15 by tightening the nut 30 onto the male thread of the protruding shaft.

An indicator 31 is engraved on the end of the protruding shaft formed in an arc shape of the movable body 290, and this indicator 31 and the guide portion 1
When the movable body 29 is fixed so that the marks 19 of No. 5 correspond to When the movable body 29 is fixed to correspond to the index 20 of the section 15, the chainsaw holder 22 is inclined by an angle equal to the center angle α, so that the chain saw holder 22 is inclined by 35 degrees from the above-mentioned fixed position. .

The protruding shaft moves within the guide hole 16 so that the movement locus of its axis draws the aforementioned arc l.

On the other hand, the height position of the chainsaw attachment part 26 is such that when the chain holder 22 is attached to the gear case 21, the cutting edge line of the cutting blade 32 of the chainsaw attached to a predetermined position of the chainsaw attachment part 26 is in the arc l. It is set to be at the same height as the center O.

Therefore, when the chainsaw attachment part 260 is installed in a predetermined position, by finely adjusting the position of the chainsaw holder 22 in the horizontal direction within the elongated hole 25, the cutting edge line on the cutting side of the cutting blade 32 can be adjusted. can be adjusted so that it passes through the center O of the arc e.

Therefore, even if the inclination angle of the chainsaw changes due to the movement guided by the guide hole 16 of the protruding shaft mentioned above, the cutting edge line of the cutting blade 32 is adjusted so that it is located at the center O of the arc 1 that is the movement locus. If this is done, the position of this cutting edge line will always be kept constant (see Figure 3).

33 is an operation handle, and one end of a cable 34 is connected to this, and the other end is connected to the joint 35 of the gear case 21.
The chain saw holder 22 is rotated by operating the gear mechanism, which is connected to a gear mechanism by a top screw 36 fitted into the gear mechanism.

A lever 37 is supported by the operating handle 33, and one end of a throttle wire 38 is fixed to this lever 37.

The other end of the throttle wire 38 is inserted through a support part 40 of a fitting 39 attached to the rear end of the chainsaw, and then to a fixed part 42 of a connecting fitting 41 that is swingably supported by the fitting 39. It is fixed with screws.

Note that 43 is a hinge screw for fixing the mounting fitting 39.

Further, the connecting fitting 41 is connected to the throttle of the chainsaw by the connecting piece 44, and by operating the throttle wire 38 with the lever 37,
This controls the chainsaw in one drive.

Next, the operation of the above-described embodiment will be explained.

First, the attachment of the chainsaw support mechanism to a standing tree will be explained.

First, a fixing stand 1 is driven into the lower side of the felling position of the tree to be felled, and a bolt is driven into the hole to fix it.

Then, after adjusting the adjustment plate 2 to be horizontal, fix it with the bolts 4, while adjusting the angle of the mounting rod 6 with respect to the fixing base 1, in other words, with respect to the standing tree, and determining the depth of the socket. Fix it at 8.

Next, the support shaft 13 is positioned so that the horizontal extension line of the indicator 19 of the guide part 15 is located below the planned final end of each cut on the vertical plane including the planned final end of each cut of the receptacle, and the bolt 14 is tightened. Fix it.

At this time, the mounting position of the sliding frame 9 is adjusted to adjust the distance between the tree to be felled and the support shaft 13.

Next, the gear case 21 is secured with a nut 30 so that the index 31 of the movable body 29 and the index 19 of the guide part 15 match, and a chainsaw holder with a chainsaw attached is attached to a part of the gear protruding from the upper surface of the gear case 21. The gears 22 and 23 are engaged.

When the chainsaw holder 22 is positioned parallel to the guide portion 15 (the state shown in FIG. 1), the cutting edge line of the cutting blade 32 of the chainsaw is aligned with each of the indicators 19.
Located directly above 31.

It's a trench, the fitting 39 for the throttle wire 38 is
It is attached to the rear handle of the chainsaw and fixed with screws 43, and the connecting piece 44 of the connecting fitting 41 is connected to the throttle of the chainsaw.

Next, the felling work will be explained.

First, a diagonal cut is made at the socket, and in the chain saw support mechanism attached to the tree in the desired state as described above, the indicator 20 of the guide part 15 and the indicator 3 of the movable body 29 are cut.
1, the chainsaw holder 22 is supported in a state in which the chainsaw holder 22 is aligned with the chainsaw holder 22, and the chainsaw is tilted at 35 degrees.

The chainsaw is started by pulling the starter, and then the chainsaw is properly driven by the lever 37 as a throttle, and the operating handle 33 is rotated to rotate the chainsaw holder 22, so that the cutting edge line of the cutting blade 32 of the chainsaw is aligned. The cut is made in a groove located directly above the indicator 19 of the guide part 15.

Then, the final end of this cut is located on a vertical plane that includes the horizontal extension of the indicator 19 and also includes the center O of the arc 1, so that the diagonal cut is accurately made to the planned final end of the cut.

Next, a horizontal cut is to be made at the socket. First, the chainsaw holder 22 is rotated back to its original position, and the index 31 of the movable body 29 is aligned with the index 19 of the guide part 15, so that the chainsaw is in a horizontal state. do.

Then, as described above, the chain saw is operated to make a cut until the cutting edge line of the cutting blade 32 is positioned directly above the indicator 19.

The final end of the cut in this horizontal cut is also located on the vertical plane that includes the horizontal extension line of the indicator 19, as well as in the diagonal cut described above, and also includes the center 0 of the circular arc l, and reaches the planned final end of the cut. Accurate horizontal cutting.

Therefore, the final ends of the cuts in the diagonal cut and the horizontal cut are exactly aligned at the desired position, and a triangular arc-shaped material is cut out.

Following this, a side cut is performed, and this work is done by linking the gear 24 of the chainsaw holder 22 with the gear mechanism in the gear case 21, so that the cutting edge of the chainsaw cutting blade 32 that performs the cut is Using the cutting edge on the opposite side, the support shaft 13 can be pulled up to a predetermined height by loosening the bolt 14, the cutting height can be determined, and cutting can be performed.

In this way, according to the present invention, the socket can be formed at a desired cutting angle, and the final ends of the diagonal cut and the horizontal cut can be precisely matched, so the direction in which the tree will fall can always be planned. This makes it possible for the operator to work safely.

Various preferred embodiments of the present invention have been described above, but it goes without saying that the present invention is not limited to the above-described embodiments. For example, the guide portion does not necessarily have to be formed in an arc shape. In addition, it is also possible to configure the guide so as to move in an arc by a pair of arc-shaped protrusions instead of a hole, and the positioning part may be provided not only by an index but also by both ends of the guide hole, without departing from the spirit of the invention. Of course, many Q modifications can be made within the range.

[Brief explanation of the drawing]

The figures show preferred embodiments of the present invention, with FIG. 1 being an overall perspective view with some parts omitted, and FIG. 2 being a perspective view showing the mounting fittings.
Fig. 3 is a schematic diagram showing the positional relationship between the guide hole and the chainsaw cutting blade in the final cutting state. 1... Fixed base, 2... Adjustment plate, 3...
...Side plate, 4...Bolt, 5...
Projection, 6... Mounting rod, 7... Arc hole, 8... Bolt, 9... Sliding frame, 1
0... Bolt, 11... Curved arm,
12...Support frame, 13...Support shaft, 1
4...Bolt, 15...Guide part, 1
6... Guide hole, 17... Index, 18
...Scale, 19.20 ...Indicator, 21
...Gya case, 22...Chainsaw holder, 23...Gya, 24...
・・・Gya, 25... Long hole, 26...
Chainsaw mounting part, 27.28... Through hole, 29... Moving body, 30... Nut,
31... Index, 32... Cutting blade, 33
・・・・Operation・・・Cable, 35・・・Joint, 36・・・Screw
37...Lever, 38...Throttle wire, 39...Mounting metal fittings, 40...
...Support part, 41...Connection fitting, 42...
...Fixing part, 43...Screw, 44...
- Connecting piece, l...Circular arc, m, n...Line, O...Center, α...Central angle.

Claims (1)

[Claims] 1. A chainsaw holder for holding a chainsaw is connected to an appropriate rotation mechanism and is supported by a guide part formed on an appropriate support member so as to be guided by the guide part and move in an arc shape, and the guide part a positioning portion is provided on the guide portion to position and fix the chainsaw holder at two locations where a center angle equal to the cutting angle of the socket to be formed in the tree to be felled is on a circular arc that is a movement trajectory formed in the tree; The supporting member is attached to a fixing member for fixing to a tree to be felled, and the chainsaw holder is configured to be held so that the cutting edge line of the cutting blade of the chainsaw passes through the center of the circular arc. A chainsaw support mechanism characterized by: