JP2556651B2 - 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 A conventional mowing device, for example, like a brush cutter, connects a bearing body for axially supporting a rotary blade and an engine with a connecting rod, and an operator attaches a grip portion provided on the connecting rod. The grass was mowed by grasping it with both hands and cutting off grass on the ground with a rotating rotary blade (disc-shaped tool).
That is, in FIGS. 4 and 5, the disc-shaped rotary blade 3 having the saw-shaped blade portion 1 on the outer periphery is pivotally supported by the bearing case 5,
When the engine 9 connected to the bearing case 5 via the connecting rod 7 is driven, it is rotationally driven 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 an upper end of the rotating shaft 21 is engaged with a tip end of the transmission shaft 11 by a bearing 25. It meshes with a bevel gear 27 that is rotatably supported by. 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, conventional rotary blades have sharp blades with a serrated tip on the outer periphery and rotate at high speed, causing serious damage when touching the trunk of a plant or the like and causing a serious accident if it touches another person's leg. There was a risk of becoming.

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

(1) When the speed is slowed down, it is impossible to cut with one rotary blade, and it is necessary to stack 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.

[0009]

According to the present invention, a transmission case 47 is provided so as to be directly and integrally connected to a prime mover such as an engine to transmit the power of the prime mover.
7, two disc-shaped blades 43, 45 having blades 41, 42 arranged side by side on the circumference are superposed coaxially, and the blades 41,
It is provided so as to be relatively reciprocally rotatable about a coaxial center so as to cut grass or the like between 42.

[0010]

[Action] Two disc-shaped blades that rotate back and forth in opposite directions scissor grass and the like between the blades of both blades.
The rotation speed is slowed to improve the safety of work, and it is possible to prevent the grass pieces from being caught.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description will be given below of an embodiment of the application under the division of the present invention with reference to the drawings. That is, in FIG. 1 to FIG. 3, upper and lower two blades 43, 45 are disc-shaped (disc-shaped) having blades 41, 42 on their outer circumferences, and the center of the circle is superposed on the transmission case 47. The engine 5 which is pivotally supported and is connected to the transmission case 47 via the connecting rod 49.
By the drive of No. 1, it is provided so as to be 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. One end of a connecting rod 49 is obliquely fixed to the transmission case 47, and an angular shaft 61 at the tip of a transmission shaft 53 that penetrates the inside of the connecting rod 49 is supported by a bevel gear 47 on the transmission case 47 via a bearing 63. 65 is engaged. In the transmission case 47, an intermediate shaft 67 is provided in the bearing 6 in the vertical direction.
It is pivotally supported via 9,69. 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. A vertical cam shaft 75 is supported on the transmission case 47 by bearings 77, 77.
A large gear 79 meshing with the small gear 73 and two circular cam plates 81 and 83 are fixed to each other via a bearing ring 85. The two cam plates 81 and 83 are large gears 79, respectively.
Eccentric to the center of the cam shaft 75 at the upper and lower positions of the bearings 85, 87 on the outer circumference, respectively.
One ends of the connecting rods 89 and 91 are fitted to each other via. Further, a vertical rotating shaft 93 is axially supported by the transmission case 47 via bearings 95 and 97, and an upper end of the rotating shaft 93 is
An arm 1 pivotally attached to the other end of the connecting rod 89 and a pin 99.
01 is integrally fixed, and the support plate 105 that engages with the square shaft 103 formed at the lower end is fixed by the nut 107. A lower blade 45 is fixed to the support plate 105 with a bolt 109. On the outer periphery of the rotating shaft 93, the rotating cylinder 1
11 is rotatably fitted and the other end of the arm 113 fixed integrally to the rotating cylinder 111 is connected by a pin 115 to a connecting rod 91.
The other end is pivotally attached. A blade 43, which is superposed on the blade 45, is fixed by a bolt 119 to a support plate 117 integrally fixed to the lower end of the rotary cylinder 111.

As a preferred embodiment of the present invention, therefore, the connecting rod 49 is eliminated and the transmission case 47 and the engine 51 are directly connected to each other, and a transmission shaft 53 for transmitting the power of the engine 51 is provided. It is formed compact so as to be transmitted to the intermediate shaft 67 via the bevel gears 65 and 71.

In both of the above embodiments, when the engine 51 is rotated, the power is transmitted from the transmission shaft 53 or directly to the intermediate shaft 67 via the bevel gears 65 and 71, and the small gear 73 and the large gear 79 are transmitted. After that, the cam shaft 75 is rotated. 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 arm 10
The blades 43 and 45 integrally fixed to the blades 1 and 113 relatively reciprocally rotate to cut grass or the like between the blade portions 41 and 42. The operator grips the grips 55 and 59 with both hands and cuts grass or the like with the reciprocating blades 43 and 45.

In addition, in the embodiment of the present invention, the engine is directly formed integrally with the transmission case, so that the engine becomes compact and can be easily used for pruning a garden tree or the like, which is convenient.

[0015]

The present invention has the following effects because it has the structure as described in the claims.
(1) The disk-shaped blade can be rotated at low speed, there is no danger of splashing pebbles, etc. 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, it can be cut in any direction, can be swung right and left like a brush cutter for reciprocating grass cutting, and can also cut a complicated shape.
(4) It is convenient to make it compact and use it for trimming garden trees.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of an embodiment of an application under the division of the present invention.

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

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

Claims (1)

(57) [Claims] 1. A transmission case 4 which is directly and integrally connected to a prime mover such as an engine to transmit the power of the prime mover.
7 is provided, and two disk-shaped blades 43, 45 having blades 41, 42 arranged side by side on the circumference are superposed on the transmission case 47 coaxially, and grass or the like is provided between the blades 41, 42. A mowing device, which is rotatably supported so as to be reciprocally rotatable about a coaxial center so as to cut.