JP2521022B2 - 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, for example, like a brush cutter, a bearing body for axially supporting a rotary blade and an engine are connected by a connecting rod, and an operator holds a grip portion provided on the connecting rod with both hands. The grass was mowed with the rotating rotary blade. That is, in FIGS. 4 and 5, the disk-shaped rotary blade 3 having the saw-shaped blade portion 1 on the outer periphery is axially supported by the bearing case 5, and is connected to the bearing case 5 via the connecting rod 7. By the driving of 9, the rotary drive is performed via the 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 that engage with the spline 29 on the outer periphery, and the disk-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. Has been done.

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 a 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, a transmission case 4 is provided.
7, two disc-shaped blades 43, 4 superposed coaxially
5 are rotatably pivoted in opposite directions,
A circular arc-shaped cutout recess 1 on the outer circumference of the disk-shaped blades 43, 45.
, 121 are arranged side by side at appropriate intervals, and cutting blades 123, 123 are formed on both side edge portions of the blade portion 41 formed between the adjacent notched concave portions 121, 121.

[0011]

[Action] Two blades that reciprocate in opposite directions scissor grass and the like, but the rotation is slowed to improve work safety, and it is possible to prevent grass from being caught. The strength of the part is increased.

[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, 45 each having blade portions 41, 41, 42, 42 on the outer circumference are axially supported by a transmission case 47 so as to be coaxially overlapped and connected. Rod 4
Driven by an engine 51 connected to a transmission case 47 via a shaft 9, a reciprocating rotation is provided 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. One end of the connecting rod 49 is inclined and fixed to the transmission case 47,
Angular shaft 6 at the tip of transmission shaft 53 penetrating the inside of connecting rod 49
1 is engaged with a bevel gear 65 pivotally supported by the transmission case 47 via a bearing 63. Transmission case 47
An intermediate shaft 67 is vertically supported by 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.
A small gear 73 is fixed to the lower part of the intermediate shaft 67. In the transmission case 47, the vertical camshaft 75 has the bearing 7
A large gear 79 that meshes with a small gear 73 and two circular cam plates 8 are supported on the cam shaft 75.
1, 83 are fixed via a bearing ring 85. 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. Also, transmission case 4
A vertical rotating shaft 93 is axially supported by 7 through bearings 95 and 97, and an upper end of the rotating shaft 93 is integrally fixed with an arm 101 pivotally attached to the other end of the connecting rod 89 by a pin 99. And the support plate 1 that engages with the square shaft 103 formed at the lower end
05 is fixed by a nut 107. Support plate 1
The blade 45 on the lower side is fixed to 05 by bolts 109. An arm 11 is rotatably fitted to the outer periphery of the rotating shaft 93 and is fixed integrally to the rotating cylinder 111.
The other end of 3 is pivotally attached to the other end of the connecting rod 91 by a pin 115. An upper blade 43, which is superposed on a lower blade 45, is fixed by a bolt 119 to a support plate 117 integrally fixed to the lower end of the rotary cylinder 111.

Circular arc-shaped cutout recesses 121, 121 ... Are juxtaposed at appropriate intervals on the outer periphery of the blades 43, 45, and a blade 41 is formed between the adjacent cutouts 121, 121. Cutting edges 123, 123 are formed on both side edges.

In the above embodiment, when the engine 51 rotates, power is transmitted from the transmission shaft 53 to the bevel gears 65 and 7.
It is transmitted to the intermediate shaft 67 via 1 and rotates the cam shaft 75 via the small gear 73 and the large gear 79. 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 to cut grass or the like between the blade portions 41 and 41. The operator grips the grips 55 and 59 with both hands and cuts grass or the like with the reciprocating blades 43 and 45.

Further, in the above embodiment, the opposing side edges of the adjacent blade portions 41 are connected to each other by the concave arc on the base side, and the stress applied here is dispersed and the strength of the blade portions 41 is increased. Will increase.

[0016]

The present invention has the following effects because it has the structure as described in the claims.
(1) Since the disc-shaped blade can be rotated at low speed, there is no risk of splashing small stones, and it is not important even if it comes into contact with a plant or the leg of another person. (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 and can be reciprocally mowed by shaking to the left and right like a brush cutter, which is efficient. In addition, it is possible to trim complicated shapes.

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 disk-shaped blade 47 transmission case 51 engine 121 notch recess 123 cutting edge

Claims (1)

(57) [Claims] 1. A pair of disc-shaped blades 43, 45 superposed coaxially on a transmission case 47 are rotatably and pivotally supported in opposite directions, respectively.
The arc-shaped cutout recesses 121, 121, ... Are juxtaposed at appropriate intervals on the outer periphery of the blade, and the cutting blades 123, 123 are provided on both side edges of the blade portion 41 formed between the adjacent cutout recesses 121, 121.
A mowing device characterized in that