JP2521023B2 - Mowing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mowing device for performing mowing work such as mowing off grass on the ground with a disc-shaped blade driven by a prime mover such as an engine.

[0002]

2. Description of the Related Art In a conventional mowing device, such as a brush cutter, a bearing body for pivotally supporting a rotary blade and an engine are connected by a connecting rod, and an operator holds a grip provided on the connecting rod with both hands. The grass was mowed with the rotating rotary blade. That is, in FIG.
In FIG. 5, a disk-shaped rotary blade 3 having a saw-shaped blade portion 1 on its outer periphery is axially supported by a bearing case 5, and is driven by an engine 9 that is connected to the bearing case 5 via a connecting rod 7. It is rotationally driven via a transmission shaft 11 penetrating the connecting rod 7. A grip 13 and a handle 15 are provided in the middle of the connecting rod 7, and a grip 17 is fixed to the handle 15. A rotating shaft 21 is vertically supported in the bearing case 5 via a bearing 19, and a bevel gear 23 fixed to the upper end of the rotating shaft 21 is engaged with the tip of the transmission shaft 11 by a bearing 25. Bevel gear 2 supported by
It meshes with 7. The lower end of the rotary shaft 21 is clamped by the upper and lower washers 31 and 33 engaging with the spline 29 on the outer periphery, and the disc-shaped rotary blade 3 having the saw blade-shaped blade portion 1 on the outer periphery is clamped and fixed by the nut 35 on the lower end. ing.

An operator carries out a mowing operation in which the grips 13 and 17 are held by both hands and the rotary blade 3 which is rotated at high speed by driving the engine 9 cuts off grass and the like on the ground.

[0004]

In this case, since the rotary blade 3 rotates at a high speed, it is dangerous to bounce off small stones or the like, and when cutting soft grass, it may be blown down by the centrifugal wind and mowed. I could not do it, and it was a cause of uncut.

In particular, since the conventional rotary blade has a sharp blade portion with a serrated tip on the outer periphery and rotates at a high speed, it causes a large scratch when touching the trunk of a plant or the like, and touches the leg of another person. There was a danger of a big accident.

In order to eliminate this danger, the rotation speed should be reduced, but this has not been implemented because of the following problems.

(1) When the speed is slowed down, one rotary blade cannot cut, and it is necessary to overlap two rotary blades and cut them like scissors.

(2) When one of the two rotary blades is fixed, the tip of the fixed blade hits a twig or the like, and the entire rotary blade cannot be pushed forward, and the twig does not enter between the blades, so cutting cannot be performed.

(3) If the two rotary blades are rotated in mutually opposite directions, the blade tip will not hit the twigs,
Therefore, the pushing of the rotary blade is not obstructed, but the rotary blade rotates at a slow speed, the centrifugal force is reduced, and the grass is wrapped around the rotary blade, which makes removal difficult.

[0010]

According to the present invention, there is provided a transmission case 47, to which power of a prime mover such as an engine is transmitted via a power transmission path, provided with blade portions 41 and 42 arranged side by side on a circumference.
A deceleration mechanism in which a plurality of disc-shaped blades 43 and 45 are superposed coaxially and are axially supported so as to be relatively reciprocally rotated by the power, and the speed of the power is reduced in the power transmission path. Is provided by interposing.

[0011]

[Action] Two disc-shaped blades, which rotate back and forth in opposite directions, scissor grass and the like, but the rotation speed is slowed to improve work safety and prevent grass from being caught. Is possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. That is, in FIGS.
Two upper and lower disc-shaped (disc-shaped) blades 43 and 45, which are provided with the blade portions 41 and 42 side by side on the outer periphery, are axially supported by being superposed on a transmission case 47, and are transmitted through a connecting rod 49. When the engine 51 connected to the case 47 is driven, they are reciprocally rotatable in opposite directions via a transmission shaft 53 penetrating the connecting rod 49. A grip 55 and a handle 57 are provided in the middle of the connecting rod 49, and a grip 59 is fixed to the handle 57. Transmission case 47
One end of the connecting rod 49 is inclined and fixed to the connecting rod 49.
An angular shaft 61 at the tip of the transmission shaft 53 penetrating the inside of the shaft is engaged with a bevel gear 65 pivotally supported by the transmission case 47 via a bearing 63. An intermediate shaft 67 is vertically supported by the transmission case 47 via bearings 69, 69. A bevel gear 71 that engages with the bevel gear 65 is fixed to the upper portion of the intermediate shaft 67. Intermediate shaft 67
A small gear 73 is fixed to the lower part of the. Transmission case 4
7, a vertical cam shaft 75 is supported by bearings 77, 77. The cam shaft 75 has a large gear 79 for meshing with a small gear 73 as a reduction mechanism to reduce power rotation, and two circular circles. The cam plates 81 and 83 of the bearing ring 85
Is fixed through. The two cam plates 81 and 83 are provided above and below the large gear 79, respectively, so as to be eccentrically and eccentrically with respect to the center of the cam shaft 75. , 91 are fitted at one end. Further, a vertical rotating shaft 93 is rotatably supported by the transmission case 47 via bearings 95 and 97, and an arm 101 pivotally attached to the other end of the connecting rod 89 and a pin 99 is provided at the upper end of the rotating shaft 93. A support plate 105 that is integrally fixed and that engages with a square shaft 103 formed at the lower end is fixed by a nut 107. The support plate 105 has a lower blade 4
5 is fixed by bolts 109. Rotating shaft 93
A rotary cylinder 111 is rotatably fitted to the outer periphery of the rotary cylinder 1
The other end of the arm 113 integrally fixed to 11 is a pin 115.
The other end of the connecting rod 91 is pivotally attached by. Rotating cylinder 11
The support plate 117 integrally fixed to the lower end of the blade 1 has a blade 45
The blade 43 overlapped with is fixed by a bolt 119.

In the above embodiment, when the engine 51 is rotated, power is transmitted from the transmission shaft 53 to the bevel gears 65 and 7.
1 is transmitted to the intermediate shaft 67, and the engine power speed is reduced via the small gear 73 and the large gear 79 as a reduction mechanism to rotate the cam shaft 75. With the rotation of the cam shaft 75, the two cam plates 81 and 83 rotate while maintaining symmetrical positions with each other, so that the arms 101 and 113 are swung in opposite directions via the connecting rods 89 and 91. Therefore, the blades 43 and 45 integrally fixed to the arms 101 and 113 relatively reciprocally rotate, and the blade 4
The grass is cut between 1, 42. The operator holds the grips 55 and 59 with both hands and reciprocally rotates the blade 4.
The grass is cut by 3,45.

[0014]

The present invention has the following effects because it has the structure as described in the claims.
(1) Since a speed reducing mechanism for reducing the power speed is interposed in the power transmission system path, it is possible to rotate the disc-shaped blade at low speed, without the risk of splashing pebbles, etc. Even if they come into contact with each other, it will not be important. (2) Since it cuts between two blades, it has good sharpness and can cut soft grass without leaving uncut residue. (3) Moreover, since the blades are arranged in a disk shape, the blades can be cut in any direction, can be swung right and left like a brush cutter to perform reciprocating grass cutting, and can also cut a complicated shape.

According to the present invention, the transmission case is connected to the engine through the connecting rod in the above-described embodiment, but the connecting rod is eliminated and the transmitting case and the prime mover such as the engine are directly integrated. You may connect and form compactly, and may be used for trimming garden trees.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view of an embodiment of the present invention.

FIG. 2 is a plan sectional view of a main part.

FIG. 3 is a developed side sectional view taken along line III-III in FIG.

FIG. 4 is a perspective explanatory view of a conventional example.

FIG. 5 is a side sectional view of the main part.

[Explanation of symbols]

 43,45 Disc-shaped blade 47 Transmission case 51 Engine

Claims (1)

(57) [Claims] 1. A transmission mechanism for transmitting the power of a prime mover such as an engine via a power transmission path is provided in the transmission case 47, and the blades 41, 4 are provided in the transmission case 47.
Two disc-shaped blades 43, 45 equipped with 2 arranged side by side on the circumference
And are coaxially supported by the power so as to reciprocally rotate around the coaxial center in the opposite directions by the power, and a speed reducing mechanism for reducing the power speed is provided in the transmission mechanism. A mowing device characterized in that