JPH07115823A - Mower - Google Patents

Abstract

PURPOSE:To provide a mower having excellent operation safety and operation efficiency, capable of revolving the rotary knives at a low speed, by fixing each of plural superimposed rotary knives to a revolving shaft and a revolving cylinder, installing a rocking device for reciprocatively rotating the rotary knives in the mutually opposite directions. CONSTITUTION:This mower is equipped with a first rocking device 121 which holds a revolving shaft 93 for fixing a first rotary knife 45 to its end and a revolving cylinder 111 fixing a second rotary knife 43 slidably superimposed on the first rotary knife 45 to its end, being rotatably engaged with the outer periphery of the revolving shaft 93 in a transmission case 47 and reciprocatively rotating the first rotary knife 45 from a cam shaft 75 put side by side in the parallel direction with the revolving shaft 93 through the revolving shaft 93 and with a second rocking case 123 which reciprocatively revolves the second rotary knife 43 from the cam shaft 75 through the revolving cylinder 111 in the opposite direction to the first rotary knife 45 in the transmission case 47.

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 grass on the ground by a rotary 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 FIG. 4 and FIG. 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. Driven by the connecting rod 7
It is rotationally driven via a transmission shaft 11 passing through. A grip 13 and a handle 15 are provided in the middle of the connecting rod 7.
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 of the transmission shaft 11 to form a bearing 25.
Is engaged with the bevel gear 27 that is axially supported by the bearing case 5. The lower end of the rotary shaft 21 is fitted with upper and lower washers 31 and 33 which engage with the splines 29 on the outer circumference.
A disk-shaped rotary blade 3 having a saw blade-shaped blade portion 1 on the outer periphery is sandwiched and fixed by a nut 35 at the lower end.

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 because of 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]

SUMMARY OF THE INVENTION According to the present invention, two rotary blades, which are superposed on each other, are fixed to a rotary shaft and a rotary cylinder fitted to the outer periphery of the rotary shaft, respectively, and are parallel to the rotary shaft. An oscillating device for reciprocally rotating the rotary blades in opposite directions from the cam shaft via the rotary shaft or the rotary cylinder is provided.

[0010]

[Function] Although two grass blades are reciprocally rotated in opposite directions to scissor grass and the like, the rotation speed can be reduced to improve work safety and prevent grass from being caught. Also, the rocking device is housed in the transmission case,
Moreover, since the rotary shaft and the rotary cylinder are easily and reliably sealed, grass pieces and dust do not adhere to the rocking device in the transmission case.

[0011]

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.
The disk-shaped upper and lower two second rotary blades 43 and the first rotary blade 45 having the blade portions 41 and 42 respectively on the outer periphery are the transmission case 4
By the drive of an engine 51 which is axially supported by being superposed on 7, and which is connected to a transmission case 47 via a connecting rod 49, it is reciprocally rotatable in opposite directions via a transmission shaft 53 penetrating the connecting rod 49. Has been. 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, and a large gear 79 meshing with a small gear 73 and two circular cam plates 81, 83 have a bearing ring 85 on the cam shaft 75. Fixed through. 2 cam plates 8
Numerals 1 and 83 are provided above and below the large gear 79, respectively, so as to be eccentrically arranged in symmetry with respect to the center of the cam shaft 75.
Connecting rods 89, 87 are provided on the outer periphery through bearing rings 85, 87, respectively.
One end of 91 is fitted. A vertical rotating shaft 93 is rotatably supported by the transmission case 47 via bearings 95 and 97, and an upper end of the rotating shaft 93 is integrally provided with the other end of the connecting rod 89 and an arm 101 pivotally attached by a pin 99. Stuck,
A support plate 105 that engages with the square shaft 103 formed at the lower end is fixed by a nut 107. The lower first rotary blade 45 is fixed to the support plate 105 with a bolt 109. An arm 113 that rotatably fits around the outer circumference of the rotary shaft 93 and that is integrally fixed to the rotary cylinder 111.
The other end of is connected to the other end of the connecting rod 91 by a pin 115. Support plate 1 integrally fixed to the lower end of the rotary cylinder 111
17 includes a second rotary blade 4 superposed on the first rotary blade 45.
3 is fixed by bolts 119.

The first swinging device 121 comprises a cam plate 81, a connecting rod 89 and an arm 101, and reciprocally rotates the first rotary blade 45 from the cam shaft 75 via the rotary shaft 93. The second swinging device 123 includes a cam plate 83, a connecting rod 91, an arm 113.
Therefore, the second rotary blade 43 is reciprocally rotated from the cam shaft 75 via the rotary cylinder 111 in the opposite direction to the first rotary blade 45.

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.
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 rotary 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 42. An operator holds the grips 55 and 59 with both hands and cuts grass or the like with the rotary blades 43 and 45 that reciprocally rotate.

[0014]

The present invention has the following effects because it has the structure as described in the claims.
(1) Since the rotary blade can rotate 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 is cut between two rotary 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, 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. (4) Since the rocking device is housed in the transmission case, and the rotary shaft and rotary cylinder are easily and reliably sealed, grass pieces and dust may adhere to the rocking device in the transmission case to prevent operation. There is no.

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 1st rotary blade 45 2nd rotary blade 47 Transmission case 75 Cam shaft 93 Rotating shaft 111 Rotating cylinder 121 First rocking device 123 Second rocking device

Claims (1)

[Claims] 1. A rotary shaft 93 for fixing a first rotary blade 45 to an end thereof, and a second rotary blade 43 slidably superposed on the first rotary blade 45 for fixed to an end thereof. A cam barrel 7 rotatably fitted to the outer periphery of 93 is pivotally supported on the transmission case 47, and is arranged in parallel with the rotary shaft 93.
5, a first swinging device 121 for reciprocally rotating the first rotary blade 45 via the rotary shaft 93, and the cam shaft 75.
A second swinging device 123 for reciprocally rotating the second rotary blade 43 in the opposite direction to the first rotary blade 45 via the rotary cylinder 111 is provided in the transmission case 47. Mowing equipment.