JPH0697899B2 - Mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (a) Field of Industrial Application The present invention relates to a mowing machine for mowing ground grass and the like by a rotary blade driven by a prime mover such as an engine or an electric motor. It is related.

(B) Conventional Technology In a conventional mower, a bearing body that pivotally supports a rotary blade and an engine are connected by a connecting rod, and an operator grips a grip portion provided on the connecting rod with both hands to rotate. I was cutting grass on the ground with a rotating blade. That is, the fourth
In FIG. 5 and FIG. 5, one disk-shaped rotary blade 3 having a saw-shaped blade portion 1 on the outer periphery is pivotally supported by a bearing case 5 and is connected to the bearing case 5 via a connecting rod 7. When the engine 9 is driven, it is rotationally driven via a transmission shaft 11 that penetrates 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. It meshes with the bevel gear 27 that is pivotally supported by. The lower end of the rotary shaft 21 is clamped by the upper and lower washers 31, 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 the nut 35 at the lower end is
Is fixed by.

An operator grips the grips 13 and 17 with both hands and uses a rotary blade 3 that rotates at high speed by driving an engine 9 to mow grass and the like on the ground.

(C) Problem to be Solved by the Invention In this case, since the rotary blade 3 rotates at a high speed, it is dangerous to bounce off pebbles or the like, and when mowing soft grass, it may be impossible to mow unless the mowing machine itself is swung. Yes. It was the cause of the uncut area.

[Structure of Invention]

(D) Means for Solving the Problem According to the present invention, a transmission case connected to an engine is provided with two superposed rotary blades pivotally supported in opposite directions so as to be reciprocally rotatable. The sharpness of the blade is improved so that there is no uncut residue, and there is no danger of bouncing off small stones, etc. Moreover, the upper rotary blade is pressed downward by the spring to prevent the structure from being easily pinched. .

(E) Action The worker reciprocates in the opposite direction by driving the engine 2
The rotary blades 43 and 45 are for cutting grass on the ground, but the rotary blades 43 and 45 are pressed against each other by a spring, and the grass does not bite. Moreover, since it can rotate at a low speed, it does not bounce stones or the like.

(F) Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

That is, in FIG. 1 to FIG. 3, two upper and lower disc-shaped upper rotary blades 43 having blade portions 41, 42 on the outer circumference, respectively,
The lower rotary blade 45 is axially supported by overlapping the transmission case 47.
Driven by a prime mover (engine in this embodiment) 51 that is connected to a transmission case 47 via a connecting rod 49, it is reciprocally provided in opposite directions via a transmission shaft 53 that penetrates the connecting rod 49. In the middle of the connecting rod 49, the grip 55 and the handle
57 is provided, and a grip portion 59 is fixed to the handle 57. One end of a connecting rod 49 is obliquely fixed to the transmission case 47, and a screw shaft at the tip of a transmission shaft 53 that penetrates the inside of the connecting rod 49.
The bearing 61 is engaged with a bevel gear 65 pivotally supported by the transmission case 47 via a bearing 63. A cam 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 part of the cam shaft 67 via a spline.
Two circular upper cams 81 and lower cams 83 are integrally fixed to the cam shaft 67. The upper cam 81 and the lower cam 83 are eccentrically arranged side by side at the upper and lower positions, respectively, symmetrically with respect to the center of the cam shaft 67. Further, in the transmission case 47, a vertical rotating shaft 93 is axially supported by a bearing 95, and a lower portion is axially movably supported by a bearing 97 via a rotating cylinder 111, which will be described later. The U-shaped upper arm 101 is fitted through the spline, and the upper cam 8
It engages with 1 and swings with the rotation of the upper cam 81. Also. A support plate 105 is fixed to a taper portion 103 formed at the lower end with a nut 107 via a key 104.
The lower rotary blade 45 is fixed to the support plate 105 with bolts 109. A rotary cylinder 111 is provided on the outer circumference of the rotary shaft 93.
Is rotatably and rotatably fitted in the axial direction, and is axially locked to the transmission case 47 via a bearing 97 and rotatably supported. ing. U to be fitted on the upper part of rotating cylinder 111 via spline
Shaped lower arm 113 engages lower cam 83 and lower cam 8
It swings with the rotation of 3. An upper rotary blade 43, which is superposed on the upper surface of the lower rotary blade 45, is fixed by a bolt 117 to a support plate 115 integrally fixed to the lower end of the rotary cylinder 111. A cover 119 that covers the bolt 109 and the nut 107 is fixed to the lower surface of the support plate 105 with a screw 121. A disc-shaped spring 123 is sandwiched between the upper arm 101 and the lower arm 113, and the upper surface of the spring 123 is rotated by a snap ring 125 via the upper arm 101 by a rotating shaft 93.
The lower surface is locked to the rotary cylinder 111 by the snap ring 127 via the lower arm 113. That is, the spring 123 pushes up the rotary shaft 93 to push the upper rotary blade 4
3 and the lower rotary blade 45 are urged in a direction of pressing each other.

In the above embodiment, when the engine 51 is rotated, the power is transmitted from the transmission shaft 53 to the cam shaft 67 via the bevel gears 65 and 71. With the rotation of the cam shaft 67, the upper cam 81,
Since the lower cam 83 rotates while maintaining symmetrical positions with respect to each other, the upper arm 101 and the lower arm 113 are swung in opposite directions. Therefore, the upper arm 101 and the lower arm 113
And the lower rotary blade 45 and the upper rotary blade 43, which are integrally fixed to each other via the rotary shaft 93 and the rotary cylinder 111, reciprocally rotate in opposite directions to cut grass or the like between the blade portions 41 and 42. It is a thing. An operator grasps the grips 55 and 57 with both hands and cuts grass or the like with the upper rotary blade 43 and the lower rotary blade 45 that reciprocally rotate.

Since the upper rotary blade 43 is pressed against the lower rotary blade 45 by the spring 123 via the rotary cylinder 111 located at the center,
The blade portions 41, 42 are evenly pressed over the circumference, and the blade portions 41, 42
Do not pinch grass pieces between them.

(G) Effects of the Invention According to the present invention, the following effects are obtained.

(1) Since the rotary blade does not rotate at high speed, there is no danger of splashing pebbles or the like.

(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 is possible to cut in any direction and to cut a complicated shape.

(4) The rotary cylinder is slidably mounted on the rotary shaft in the axial direction, and the spring is provided between the upper arm and the lower arm fixed to the rotary shaft and the rotary cylinder respectively. The blade and the blade can be pressed against each other with a simple structure and evenly, they are sharp and do not bite grass or the like.

In the present invention, the transmission case is connected to the engine through the connecting rod, but the connecting rod is eliminated and the transmission case and the engine are directly connected to each other to form a compact structure. You may use it for trimming garden trees.

Further, in the above-mentioned embodiment, the rotary shaft is provided slidably in the axial direction, but the rotary cylinder is provided slidably in the axial direction so that the upper rotary blade and the lower rotary blade are pressed against each other by the spring. It may be provided.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of an embodiment of the present invention, FIG. 2 is a plane sectional view of a main part, FIG. 3 is a side sectional view, FIG. 4 is a perspective explanatory view of a conventional example, and FIG. It is a sectional side view of a waist part. 43 ... upper rotary blade, 45 ... lower rotary blade 47 ... transmission case, 51 ... motor (engine) 67 ... cam shaft, 93 ... rotating shaft 101 ... upper arm, 111 ... rotating cylinder 113 ... lower arm, 123 ... spring

Claims (1)

[Claims] 1. A rotary shaft 93 for fixing a lower rotary blade 45 in a transmission case 47, and an outer circumference of the rotary shaft 93 slidably in the axial direction relative to the rotary shaft 93, and A rotary cylinder 111 that rotatably fits is provided, and an upper rotary blade 43 that is superposed on the upper surface of the lower rotary blade 45 is fixedly provided to the rotary cylinder 111. The rotary shaft 93 and the rotary cylinder 111 are interlocked with the cam shaft 67 that rotates by the drive of
Upper arm 101 that reciprocally rotates in opposite directions
And a lower arm 113 are fixed to the rotary shaft 93 and the rotary cylinder 111, respectively, and the rotary cylinder 111 and the rotary shaft are provided between the lower surface of the upper arm 101 and the upper surface of the lower arm 113.
A mower having a spring 123 for urging the upper rotary blade 43 and the lower rotary blade 45 against each other by urging 93 relative to each other.