JP2005006528A - Brush cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for effectively carrying out vibration-proof countermeasures for an operation handle of a brush cutter by simple constitution. <P>SOLUTION: The brush cutter is equipped with an operation rod 11 provided with a cutting blade 13 at one end and an engine 15 at the other end and an operation handle 20 attached through a connecting member (a handle holder) 32 to the middle (an intermediate part) 17 of the operation rod 11. In the brush cutter, a handle holder 32 is composed of a spherical bushing 61 for attaching the handle holder 32 to the side of the operation rod 11 and a cup member 62 rotatably covering the spherical bushing 61. The operation handle 20 is shakingly supported on the operation rod 11 by attaching the operation handle 20 to the cup member 62. The operation handle can shakingly be supported for the operation rod and the vibration of an operation frame can be absorbed with the spherical bushing and the cup member. As a result, the vibration of the operation frame can scarcely be transmitted to the operation handle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a brush cutter.
[0002]
[Prior art]
There is known a brush cutter in which a cutting blade is provided at one end of an operating rod, an engine is provided at the other end of the operating rod, and an operating handle is provided in the middle of the operating rod (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 64-6682 (page 4, Fig. 2)
[0004]
FIG. 8 is a reprint of FIG. However, the code described in the publication was used.
In the brush cutter of Patent Document 1, the handles 4 and 4 are attached to the support rod 14 with the handle attachment 18, the first attachment 24 is attached to the support rod 14 via the first vibration isolation rubbers 22, 22, and the support rod 14. A second attachment 28 is attached to the first and second attachments 24, 28 via the second anti-vibration rubbers 26, 26, and an operating rod (not shown) is attached to the first and second attachments 24, 28, so that an engine, a cutting blade, etc. This is designed to prevent vibration from being transmitted from the operation rod to the handles 4 and 4.
[0005]
[Problems to be solved by the invention]
However, in the brush cutter of Patent Document 1, it is necessary to interpose four anti-vibration rubbers of the first anti-vibration rubbers 22 and 22 and the second anti-vibration rubbers 26 and 26 between the handles 4 and 4 and the operating rod. The structure around the handle of the brush cutter becomes complicated. In addition, since the number of parts is large, the assemblability is poor.
[0006]
Further, although the first vibration isolation rubbers 22 and 22 and the second vibration isolation rubbers 26 and 26 can be expected to reduce vibrations to some extent, the elasticity of the first vibration isolation rubbers 22 and 22 and the second vibration isolation rubbers 26 and 26 is expected. There is a limit to vibration countermeasures that depend only on sex.
In other words, it is desirable to effectively promote the anti-vibration measures for the handle (operating handle) of the brush cutter with a simple configuration.
[0007]
Accordingly, an object of the present invention is to provide a technique capable of effectively taking a vibration-proof measure for an operation handle of a brush cutter with a simple configuration.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention provides a cutting tool provided with an operating rod provided with working means at one end and a power source at the other end, and an operating handle attached via a connecting member in the middle of the operating rod. In the dispenser, the connecting member is composed of a spherical bush that is attached to the operating rod side and a cup member that is rotatably covered on the spherical bush. By attaching the operating handle to the cup member, the operating handle is attached to the operating rod. And is supported so that it can swing.
[0009]
In the brush cutter, it is desirable to take into consideration that vibrations of the engine and the like are not transmitted from the operation rod to the operation handle in order to reduce the burden on the operator.
Therefore, the connecting member is composed of a spherical bush that is attached to the operating rod side and a cup member that is rotatably covered on the spherical bush. By attaching the operating handle to the cup member, the operating handle is attached to the operating rod. Supported to swing.
[0010]
That is, the connecting member is composed of a spherical bush that is attached to the operating rod side and a cup member that is rotatably covered on the spherical bush, and the operating handle is attached to the cup member so that the operating handle is attached to the operating rod. It can be supported in a swingable manner, and the vibration of the operation frame can be absorbed by the spherical bush and the cup member. As a result, the vibration of the operation frame can be made difficult to be transmitted to the operation handle.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a brush cutter according to the present invention. A brush cutter 10 includes an operating rod 11 formed of a pipe, and a cutting blade 13 as a working means rotatably attached to one end 12 of the operating rod 11. The engine 15 as a power source attached to the other end 14 of the operation rod 11, the drive shaft 16 through which the operation rod 11 is driven in order to drive the cutting blade 13 by the engine 15, and the middle of the operation rod 11 And an operation handle 20 attached to the intermediate portion 17.
[0012]
The operation rod 11 includes a belt hooking portion 22 for hanging the hanging belt 21 for shoulder straps, and a scattered matter protection cover 23 for preventing pebbles and cut grass from flying by the rotation of the cutting blade 13. The engine 15 includes a fuel tank 24 that stores fuel. In the figure, reference numeral 25 denotes an operation cable extending from the operation handle 20 to the engine 15 via the belt hooking portion 22.
[0013]
2 is a cross-sectional view taken along the line 2-2 of FIG. 1 and shows that the drive shaft 16 can be passed through the center of the operating rod 11 to transmit the power of the engine 15 to the cutting blade 13 (see FIG. 1).
Further, the brush cutter 10 has an operation handle 20 attached to the operation rod 11 via a handle holder 32 as a connecting member, and left and right grips 26, 27 are fitted to both ends of the operation handle 20. It shows that a throttle lever 28 is provided for adjusting the rotational speed of the engine 15 and transmitting or not transmitting the rotation of the engine 15 to the cutting blade 13 (see FIG. 1).
[0014]
FIG. 3 is an explanatory view showing a usage state of the brush cutter according to the present invention.
In general, the worker M hangs a shoulder hanging belt 21 on the belt hanging portion 22 of the operating rod 11, suspends the brush cutter 10 on the shoulder with the shoulder hanging belt 21, and grips the left and right grips 26, 27 with both hands. , Put a finger on the throttle lever 28 of the right grip 27, rotate the cutting blade while adjusting the rotational speed of the engine 15, walk back and forth while swinging the operation rod 11 left and right, and perform mowing work. In the figure, 29 indicates weeds.
[0015]
The vibration generated by the rotation of the engine 15 and the cutting blade 13 during the mowing operation causes the operating rod 11 to vibrate, and is transmitted from the operating rod 11 to the operating handle 20, and the operating handle 20 vibrates to the operator M. Is transmitted.
In general, the vibration transmission direction A from the operation frame is transmitted perpendicularly to the operation handle 20. Therefore, when vibration is transmitted from the operation rod 11 to the operation handle 20, it is considered that the vibration can be made difficult to be transmitted by swinging the operation handle 20 with respect to the operation rod 11.
[0016]
4 is a front view of the operation handle of the brush cutter according to the present invention. The operation handle 20 includes a handle main body 31 formed of a pipe and left and right grips 26 and 27 attached to both ends of the handle main body 31. FIG. The handle holder 32 for attaching to the operating rod 11 is provided.
The right grip 27 includes a throttle lever 28 that adjusts the number of revolutions of the engine 15 and transmits / not transmits engine rotation to the cutting blade.
[0017]
In the figure, 33 is an operating rod mounting portion of the operating handle 20 (handle main body 31) to be attached to the operating rod 11 via the handle holder 32, 34 and 35 are left and right handle continuous portions of the handle main body 31, and 36 and 37 are left and right portions. A grip fitting part is shown.
The two-dot chain line schematically illustrates vibration, 41 and 42 indicate vibration strings, and 43 to 46 indicate vibration nodes.
[0018]
Next, the left grip 26 will be described.
5A and 5B are configuration diagrams of the left grip of the brush cutter according to the present invention, FIG. 5A shows a cross-sectional structure of the left grip, and FIG. A line section structure is shown.
As shown in (b), the left grip 26 is a two-part grip that sandwiches the handle main body 31, and the first grip half 51 and the second grip half 52 are overlapped to attach two pieces. It is fixed with screws 53 and 54.
More specifically, the mounting screw 54 is passed through the through hole 57 opened in the handle main body 31, and the handle main body 31 and the first and second grip halves 51, 52 are fastened together with the mounting screw 54, thereby The left grip 26 is attached to 31.
[0019]
The first and second grip halves 51 and 52 have a plurality of annular ribs 58... (... indicate a plurality, which are opposed to the outer peripheral surface of the handle body 31 with a constant interval in the longitudinal direction. Are formed integrally, and clearance portions 59... Are formed by gaps between the outer peripheral surface of the handle body 31 and the tips of the annular ribs 58.
[0020]
That is, the left grip 26 is provided with a relief portion 59... For floating the grip portion 56 on the handle body 31 except for the attachment portion 55 attached to the handle body 31 with the attachment screw 54. Except for this, the grip portion 56 can be floated from the handle body 31.
Note that the right grip 27 (see FIG. 2) has substantially the same configuration and will not be described in detail.
[0021]
FIG. 6 is a side sectional view of the handle holder of the brush cutter according to the present invention. The handle holder 32 is composed of a spherical bush 61 attached to the operating rod 11 side and a cup member 62 rotatably covered on the spherical bush 61. Become.
The spherical bush 61 is a member that attaches a pair of half members 63, 63 to the operation rod 11, and the half member 63 contacts the protrusion 65 that fits into the support hole 64 of the operation rod 11 and the cup member 62. A spherical surface portion 66 to be provided.
[0022]
The cup member 62 includes a pair of front and rear holders 67 and 68 that cover the spherical bush 61 in a rotatable manner, and bolts 69... And bolts 71 and 71 (only one piece) for connecting the front and rear holders 67 and 68. It is a member comprised from these. In other words, the cup member 62 is configured so that the spherical bush 61 can be rotated (swingable) and the operation handle 20 by bolting the rear holder 68 to the front holder 67 with the bolts 69. It can be said that this is a member for fixing
[0023]
The front holder 67 includes a support portion 72 that rotatably supports the spherical bush 61, a mounting portion 73 for attaching the operation handle 20, a female screw portion 74 for screwing bolts 69, and bolts 71 and 71. Female screw portions 75 and 75 (only one is shown).
The rear holder 68 includes a support portion 76 that rotatably supports the spherical bush 61, a mounting portion 77 for attaching the operation handle 20, a through hole 78 through which the bolts 69 are passed, and bolts 71 and 71. And through-holes 79 and 79 to be penetrated.
[0024]
FIG. 7 is an explanatory view showing the movement of the handle holder of the brush cutter according to the present invention. The brush cutter 10 is provided with a cutting blade 13 at one end 12 (see FIG. 1) and an operating rod 11 provided with an engine 15 at the other end. And a spherical bush that attaches the handle holder 32 to the side of the operation rod 11 in a brush cutter provided with an operation handle 20 attached to the middle (intermediate portion) 17 of the operation rod 11 via a connecting member (handle holder) 32. 61 and a cup member 62 that is rotatably covered on the spherical bush 61. By attaching the operation handle 20 to the cup member 62, the operation handle 20 is swingably supported with respect to the operation rod 11. It can be said that. Therefore, the brush cutter 10 can swing the operation handle 20 with respect to the operation rod 11 as shown by an arrow B.
[0025]
For example, in a brush cutter, in order to reduce the burden on the operator, it is desired to consider not transmitting vibrations of the engine or the like from the operating rod to the operating handle.
Therefore, the connecting member (handle holder) 32 is composed of a spherical bush 61 attached to the operating rod 11 side and a cup member 62 rotatably covered on the spherical bush 61, and the operating handle 20 is attached to the cup member 62. Thus, the operation handle 20 is supported so as to be swingable with respect to the operation rod 11.
[0026]
That is, the connecting member (handle holder) 32 is constituted by a spherical bush 61 attached to the operation rod 11 side and a cup member 62 rotatably covered on the spherical bush 61, and the operation handle 20 is attached to the cup member 62. Thus, the operation handle 20 is supported so as to be swingable with respect to the operation rod 11. Thereby, the vibration of the operation frame 11 can be absorbed by the swinging of the spherical bush 61 and the cup member 62.
As a result, it is possible to make it difficult to transmit the vibration of the operation frame 11 to the operation handle 20.
[0027]
In the embodiment, as shown in FIG. 1, the engine 15 is used as a power source. However, the present invention is not limited to this, and the power source may be an electric motor.
In the embodiment, as shown in FIG. 6, the connecting member (handle holder) 32 is composed of a spherical bush 61 and a cup member 62. At least one of these spherical bush 61 and cup member 62 is made of hard rubber or the like. It may be formed using an elastic member. That is, by using an elastic member such as hard rubber for the connecting member (handle holder), the vibration absorbing effect of the spherical bush and the cup member can be further promoted.
[0028]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect of the present invention, the connecting member is composed of a spherical bush that is attached to the operating rod side and a cup member that is rotatably covered on the spherical bush, and the operating handle is attached to the cup member so that the operating handle is attached to the operating rod. Therefore, the operation handle can be supported to be swingable with respect to the operating rod, and the vibration of the operation frame can be absorbed by the spherical bush and the cup member. As a result, the vibration of the operation frame can be made difficult to be transmitted to the operation handle.
[Brief description of the drawings]
FIG. 1 is a side view of a brush cutter according to the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. 1. FIG. 3 is an explanatory diagram showing a usage state of the brush cutter according to the present invention. Fig. 5 is a front view of an operating handle of the brush cutter according to the present invention. Fig. 5 is a configuration diagram of a left grip of the brush cutter according to the present invention. Fig. 6 is a side sectional view of a handle holder of the brush cutter according to the present invention. Explanatory drawing which shows the movement of the handle holder of the brush cutter concerned. [FIG. 8] A reprint of FIG. 2 of Patent Document 1 [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Brush cutter, 11 ... Operation frame, 12 ... One end, 13 ... Working means (cutting blade), 14 ... Other end, 15 ... Power source (engine), 17 ... Middle (intermediate part), 20 ... Operation handle, 32 ... connecting member (handle holder), 61 ... spherical bush, 62 ... cup member.

Claims (1)

In a brush cutter comprising an operating rod provided with working means at one end and a power source at the other end, and an operating handle attached via a connecting member in the middle of the operating rod,
The connecting member includes a spherical bush attached to the operation rod side and a cup member rotatably covered on the spherical bush. The operation handle is attached to the cup by attaching the operation handle to the cup member. A brush cutter characterized by being supported so as to be swingable.

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