JP2003225011A - Grip apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grip apparatus which can efficiently prevent that vibrations are directly transmitted to the hand of a worker through an operation rod and a grip (holding portion). <P>SOLUTION: This grip apparatus (20) that is fit onto the operation rod (7) to whose front end a working portion (10) to which the power of an internal combustion engine is transmitted is attached and wherein a throttle lever for controlling the opening of the throttle valve (CV) of the internal combustion engine is built comprises a grip body (25) wherein a lever case portion (40) swingably holding the throttle lever (50) is connected to the front side of a cylindrical holding portion (30) to be held by the hand, and a pair of front and rear circular or cylindrical vibration-proof tools (70, 70) comprising an elastic material and inserted between the operation rod (7) and the front and rear portions (41), (31) of the grip body (25) to support the grip body (25) in a state floated from the operation rod (7). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grip device attached to an operating rod of a portable brush cutter or the like, and more particularly to a throttle of an internal combustion engine which is a power source for driving a working portion including a brush blade. A throttle lever for controlling the opening of the valve is incorporated, and vibration generated in the internal combustion engine or the working unit is prevented from propagating to the operator's hand through the operating rod and the grip (grasping unit). Therefore, the present invention relates to a grip device that is attached to an operating rod of a portable brush cutter or the like with anti-vibration measures.

[0002]

2. Description of the Related Art For example, in a portable working machine such as a brush cutter, a working portion including a cutting blade is provided at a front end of an operating rod, and a power for driving the cutting blade is provided at a rear end thereof. An internal combustion engine such as a two-stroke gasoline engine is installed as a source. A front grip and a rear grip are attached to the front and rear of the operation rod, and an operator grips both grips and operates the operation rod to perform mowing work and the like.

In such a portable work machine, a throttle lever for controlling the opening of the throttle valve of the internal combustion engine may be incorporated in one of the grips (usually the rear grip). As described above, by incorporating the throttle lever in the grip, the throttle lever can be operated while gripping the grip, so that operability and convenience are improved.

[0004]

By the way, in the portable work machine, the vibration generated in the internal combustion engine or the working section propagates to the operator's hand through the operating rod and the grip, and the operability is deteriorated. , Causing problems such as getting tired easily.

Therefore, some conventional grips having a simple structure in which a throttle lever is not incorporated take anti-vibration measures to prevent the propagation of the vibration (Japanese Utility Model Publication No. 6-39548, Japanese Patent Publication No. Kaisho 52-1384
No. 3, etc.). However, regarding the grip device incorporating the throttle lever, no effective anti-vibration measures have been found due to the complexity of its structure.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an internal combustion engine which serves as a power source for driving a working portion such as a cutting blade. A throttle lever for controlling the opening of the throttle valve is incorporated, and vibration generated in the internal combustion engine or the working unit is directly transmitted to the operator's hand through the operating rod and the grip (grasping unit). It is an object of the present invention to provide a grip device that can be effectively prevented.

[0007]

In order to achieve the above object, a grip device according to the present invention is basically a grip device externally fitted to an operating rod, and has a split main body. And a pair of front and rear annular or tubular members made of elastic material that are inserted between the front and rear ends of the grip body and the operating rod to support the grip body in a state of being floated from the operating rod. It is characterized in that it is provided with a vibration isolator.

The vibration isolator preferably has an operation rod outer contact portion whose inner peripheral surface is pressed against the operation rod, and an inner diameter larger than an outer diameter of the operation rod, and is provided at an end portion of the grip body. The grip inner fitting portion to be fitted is integrally molded to have a cross-sectional outer shape of a substantially convex shape.

In this case, in a preferred embodiment, an annular groove is formed between the operating rod outer contact portion and the grip inner fitting portion. In another preferred aspect, an annular spring member for pressurization is externally fitted to the outer circumference of the operating rod circumscribed portion, and more preferably, a ring member for ensuring a required rigidity is internally provided to the inner circumference of the grip inner fitting portion. Be fitted.

On the other hand, in another preferred embodiment of the grip device according to the present invention, the grip device is externally fitted to an operating rod having a working portion to which power of an internal combustion engine is transmitted is attached to a front end of the grip device. A throttle lever for controlling the opening degree of a throttle valve of an internal combustion engine is incorporated, and a lever case portion for swingably holding the throttle lever is provided on the front side of a cylindrical grip portion that is gripped by hand. A grip body that is continuously provided, and is made of an elastic material that is inserted between the front and rear ends of the grip body and the operating rod to support the grip body in a state of being floated from the operating rod. A pair of front and rear annular or tubular vibration isolator is provided.

Further, in another specific aspect of the grip device according to the present invention, the throttle lever is arranged below the grip portion of the grip body, and the throttle lever is undesired above the grip portion. A safety lock lever is arranged for restricting and swinging the swing.

In the grip device according to the present invention having such a structure, the grip main body including the lever case part in which the throttle lever is incorporated and the grip part to be gripped by hand is operated by the pair of front and rear vibration isolator. Since it is supported in a state of being floated from the rod, the vibration generated in the internal combustion engine and the working part is damped and absorbed by the vibration isolator before propagating to the grip body, so that the vibration is absorbed by the worker's hand. Direct propagation can be effectively prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a portable brush cutter in which an embodiment of a grip device according to the present invention is adopted.

In the portable brush cutter 1 of the illustrated example, a working portion 10 including a cutting blade 11 and a safety cover 12 is provided at the front end of the operating rod 7, and the cutting blade 11 is provided at the rear end thereof. Internal combustion engine (small air-cooled two-cycle gasoline engine) provided with a recoil starter 6 and a fuel tank 4 as a power source for driving a drive shaft 13 (see FIGS. 2 to 4) installed in the operation rod 7. 2, an internal combustion engine 2 is provided with a carburetor having a throttle valve CV and a spark plug 5. A front grip 15 equipped with a general anti-vibration device is externally fitted and fixed to the vicinity of the central portion of the operation rod 7, and the grip device 2 of the present embodiment is provided on the rear side of the front grip 15.
0 is fixed by external fitting.

The grip device 20 of this embodiment is shown in FIG.
As shown in FIGS. 3 and 4, the grip body 25 has a left and right split structure including a left half body 25A and a right half body 25B integrally molded with plastic having appropriate rigidity. In the grip body 25, a lever case portion 40 is integrally connected to the front side of a cylindrical grip portion 30 that is gripped by hand.

Left half 2 which constitutes the grip body 25
The 5A and the right half body 25B are fitted so as to sandwich the operating rod 7 from the left and right, and are respectively inserted into two upper and lower positions of their front and rear end portions (the lever case portion 40 and the rear end portion 31 of the grip portion 30). Bolts and nuts 26 screwed together,
They are integrated by 26, 27 and 27.

A throttle lever 50 for controlling the opening degree of the throttle valve CV of the internal combustion engine 2 is arranged below the lever case portion 40. The throttle lever 50 has a substantially arcuate operation portion 51 which projects rearward under the grip portion 30, and a throttle cable which is inserted through an outer tube 17 of a Bowden cable 16 connected to the throttle valve CV. An oscillating portion 52 connected to an upper end portion is formed in an inverted V shape, and an intermediate portion is swingably held by the lever case portion 40 by a support shaft 43. It should be noted that the lower portion of the grip portion 30 of the grip body 25 has a structure shown in FIG.
And as shown in FIG. 3, the Bowden cable 16
The cable insertion portion 3 into which the outer tube 17 of the above is inserted in the grip body 25 in a positionally immovable manner.
3 is formed.

A safety lock lever 55 is arranged above the lever case 40 for restricting and releasing the unwanted swing of the throttle lever 50. The safety lock lever 55 has the grip portion 30.
The operation lever 56 protruding rearward above the throttle and the throttle lever 50 via the throttle latch 65.
Of the undesired swing of the swing unit 57 for controlling and canceling
It has a V-shape and consists of a support shaft 44
Is swingably held by the lever case portion 40. The throttle latch 65 is pivotally supported by the lever case portion by a support shaft 46, and is also biased by a spring portion 66 in a direction to engage the throttle lever 50 and prevent the swing thereof. Here, when the grip portion 30 is not gripped by hand, the safety lock lever 55
2 is in the position shown by the solid line in FIG. 2, and at this time, the throttle latch 65 is placed in a position where the urging force of the spring portion 66 restricts the swing of the throttle lever 50.

On the other hand, when the grip portion 30 is gripped by hand, the safety lock lever 55 is pushed down by the palm and swung to the position shown by the phantom line in FIG. 2, whereby the throttle latch 65 resists the urging force of the spring portion 66 and the throttle lever 5
It is placed at the position where the regulation of 0 is released. A slide switch 60 for controlling ON / OFF of the ignition device of the internal combustion engine 2 is arranged on the upper surface of the lever case portion 40.

In the grip device 20 of the present embodiment, the front end portion 41 and the rear end portion 31 of the grip main body 25.
And a pair of front and rear cylindrical antivibration devices 70 made of an elastic material such as rubber, which are inserted between the operating rod 7 and the grip body 25 to support the grip body 25 in a floating state from the operating rod 7. 70 are provided.

The vibration isolator 70 has an operation rod outer contact portion 7 whose inner peripheral surface is elastically pressed against the outer peripheral surface of the operation rod 7.
1 and an inner diameter larger than the outer diameter of the operating rod 7, and the outer peripheral portion of which is fitted in annular inner fitting grooves 42, 32 provided in the front and rear end portions 41, 31 of the grip body 25. The inner fitting portion 72 and the inner fitting portion 72 are integrally formed so that the cross-sectional outer shape is a substantially convex shape toward the outside. A predetermined gap Sb is provided between the grip inner fitting portion 72 and the operating rod 7. Are formed. Further, the vibration isolator 70, 7 having such a configuration
By using 0, a gap Sa of at least about 2 to 3 [mm] is formed and maintained between the grip body 25 and the operating rod 7.

On the other hand, an annular inner peripheral groove 77 is formed between the operating rod outer contact portion 71 and the grip inner fitting portion 72, and this portion is thin in order to enhance vibration damping.
Further, an outer peripheral annular groove 74 is formed on the outer periphery of the operating rod circumscribing portion 71, on which an annular spring member 75 for fixing pressure that connects both ends of the coil spring is fitted.
Further, a synthetic resin ring member 76 for ensuring a required rigidity is fitted in the inner circumference of the grip inner fitting portion 72 so as to correspond to the positions of the annular inner fitting grooves 42, 43.

In the vibration isolator 70 having such a structure, the inner diameter of the operation rod outer contact portion 71 is made slightly smaller than the outer diameter of the operation rod 7, and the inner peripheral surface of the operation rod outer contact portion 71 is the operation rod 7. In addition to being pressed against, the grip body 25 is substantially fixed at a predetermined position on the operating rod 7 at the position shown in the drawing because it is pressed by the annular spring member 75. In order to move the grip body 25 in the front-rear direction, the annular spring member 75 may be removed from the outer peripheral annular groove 74, and the vibration isolator 70, 70 may be slid on the operating rod 7 as appropriate.

The size of the annular inner circumferential groove 77 formed between the operating rod outer contact portion 71 and the grip inner fitting portion 72, and the ring member 76 fitted in the grip inner fitting portion 72. By appropriately setting the wall thickness (rigidity) and the like, the vibration generated in the internal combustion engine 2 and the working unit 10 can be more effectively attenuated and absorbed.

In the grip device 20 of this embodiment having such a structure, the grip main body 25 including the lever case portion 40 in which the throttle lever 50 is incorporated and the grip portion 30 to be gripped by hand is provided in a pair of front and rear. Anti-vibration equipment 70, 7
Since it is supported in a state of being floated from the operating rod 7 by 0, the vibration generated in the internal combustion engine 2 or the working unit 10 is transmitted to the grip body 25 before the vibration isolator 7
It is damped and absorbed by 0 and 70, so that it is possible to effectively prevent the vibration from directly propagating to the operator's hand.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and is designed within the scope not departing from the spirit of the invention described in the claims. In, various changes can be made.

[0028]

As can be understood from the above description, in the grip device of the present invention, the grip main body including the lever case part in which the throttle lever is incorporated and the grip part to be gripped by the hand has a pair of front and rear protective parts. Since it is supported by the swinging device in a state of being floated from the operating rod, vibration generated in the internal combustion engine or the working portion is damped and absorbed by the vibration damping device before propagating to the grip body, and therefore the vibration is generated. It can be effectively prevented from directly propagating to the worker's hand.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a portable brush cutter in which an embodiment of a grip device according to the present invention is adopted.

FIG. 2 is a cross-sectional view showing an embodiment of a grip device according to the present invention.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG.

[Explanation of symbols]

2 ... Internal combustion engine 7 ... Operation stick 10 ... Working department 20 ... Grip device 25 ... Grip body 30 ... Grip 31 ... rear end 40 ... Lever case 41 ... Front end 50 ... Throttle lever 55 ... Safety lock lever 70 ... Anti-vibration equipment 71 ... Operation rod circumscribed part 72 ... Grip internal fitting portion 75 ... Annular spring member 76 ... Ring member 77 ... Ring groove CV ... Throttle valve

Claims (7)

[Claims] 1. A grip device (20) externally fitted to an operating rod (7), the grip body (25) having a split structure.
And the grip body (25) is inserted between the front end portion (41) and the rear end portion (31) of the grip body (25) and the operating rod (7), respectively, and the grip body (25) is removed from the operating rod (7). A grip device comprising: a pair of front and rear annular or tubular vibration dampers (70, 70) made of an elastic material that are supported in a floating state. 2. The operating rod outer contacting portion (7) of the vibration isolator (70), the inner peripheral surface of which is pressed against the operating rod (7).
1) and an inner diameter larger than the outer diameter of the operating rod (7), the both ends (41, 31) of the grip body (25).
The grip device according to claim 1, wherein a grip inner fitting portion (72) which is fitted inside is integrally molded, and a cross-sectional outer shape is a substantially convex shape. 3. The grip device according to claim 2, wherein an annular groove (77) is formed between the operating rod circumscribing portion (71) and the grip inner fitting portion (72). 4. The grip device according to claim 2, wherein an annular spring member (75) for pressurization is externally fitted to the outer periphery of the operating rod circumscribing portion (71). 5. The ring member (76) for ensuring a required rigidity is internally fitted to the inner circumference of the grip inner fitting portion (72). The grip device according to the item. 6. An operating rod (7) having a working part (10) for transmitting power of an internal combustion engine (2) attached to a front end thereof.
It is a grip device (20) which is externally fitted to the internal combustion engine (2) and incorporates a throttle lever (50) for controlling the opening of a throttle valve (CV) of the internal combustion engine (2), which is gripped by hand. A grip body (25) in which a lever case portion (40) for swingably holding the throttle lever (50) is continuously provided on the front side of a cylindrical grip portion (30), and the grip body (25). ) Front end (41)
And a pair of front and rear elastic members that are respectively inserted between the rear end portion (31) and the operating rod (7) to support the grip body (25) in a state of being floated from the operating rod (7). A grip device comprising: an annular or tubular vibration isolator (70, 70). 7. The throttle lever (50) below the grip portion (30) of the grip body (25).
And a safety lock lever (55) for restricting and releasing undesired rocking of the throttle lever (50) is arranged above the grip portion (30). The grip device according to claim 6.