JPS646035Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting blade device for a mower, and relates to providing a device that has the purpose of making the mower compact and mowing the grass without leaving any uncut areas.

Conventionally, mowers include cutting blades that rotate around a vertical axis and are arranged horizontally and at substantially the same height, and that cover the horizontal periphery and upper part of these cutting blades and rotatably support the cutting blades. It mainly consists of a mower frame and a mower frame. The mower is, for example, suspended from the lower abdomen of an agricultural tractor, and grass is cut by the movement of the tractor and the rotation of the mower's cutting blade.

In the above case, in order to avoid interference between adjacent cutting blade bodies and to prevent uncut areas between adjacent cutting blade bodies, the cutting blade bodies are deflected back and forth. The outer periphery of the rotation locus is configured to overlap in the front-rear direction.

However, in the above conventional configuration, the mower becomes larger overall because the cutting blade body is deflected back and forth.
Furthermore, since the blades are overlapped back and forth, the lateral dimension becomes smaller and the cutting width also becomes smaller.

The present invention was devised in view of such conventional problems, and its characteristics are that the plurality of cutting blade bodies rotating around a vertical axis are substantially linear in the horizontal direction; An auxiliary cutting blade body is arranged at the same height and spaced apart from each other, and an auxiliary cutting blade body is provided protruding from one of the cutting blade bodies, and the auxiliary cutting blade body is arranged vertically on the outer periphery of the rotation locus of the cutting blade body adjacent to the cutting blade body. It is located at a point formed to be close to each other in the direction of polymerization.

Hereinafter, embodiments of the present invention will be explained according to the drawings.
In FIGS. 1 to 3, a mower 1 is suspended from the lower abdomen of a transmission case 3 of an agricultural tractor 2 via a pantograph-shaped support device 4, and is disposed between front and rear wheels 5, 6 of the tractor 2. Ru.

The mower 1 includes a mower frame 7 connected to a support device 4, a rotary shaft 8 with a longitudinal axis supported by the mower frame 7 so as to be rotatable around the axis, and a lower end of the rotary shaft 8. Mainly composed of a cutting blade body 9 that is detachably fixed, and a group of support wheels 11 that are provided on the mower frame 7 and rollably abut on the work ground surface 10 when the machine frame 7 is in the descending position. be done.

The mower frame 7 is horizontally elongated and has a box shape with a downward opening, and a rotating shaft 8 is supported at approximately the center of the mower frame 7 in the lateral direction, and at each position on the left and right sides of the mower frame 7 via support portions 12, respectively. Ru.

Each rotating shaft 8 has a belt transmission wheel 13, a belt 14 is wound around these transmission wheels 13, and a tension pulley 15 is provided which rolls and resiliently presses against the belt 14. 14 causes each rotating shaft 8 to rotate in the same direction. The central rotating shaft 8 is interlocked and connected to the transmission part 15 via a tractor PTO shaft, a universal joint shaft, etc. (not shown). 16 is a guide pulley that avoids interference between the belts 14.

The cutting blade body 9 is a band-like member as a whole,
A mounting hole 18 is provided in the center in the longitudinal direction, and the rotary shaft 8 is removably fixed to the lower end of the rotating shaft 8 by a bolt 19 that is inserted through the mounting hole 18 and screwed into the lower end surface of the rotating shaft 8.

The cutting blade body 9 has a cutting blade part 9a formed at the front edge in the rotational direction at both ends in the longitudinal direction, and a winding blade 9b bent upward at the rear part to float the grass cut by the cutting blade part 9a. It is said that These cutting blade bodies 9 are spaced apart from each other in a horizontally substantially vertical line and at approximately the same height, and an auxiliary cutting blade body 20 is detachably attached to one longitudinal end of the central cutting blade body 9 via a bolt 21. is fixed to. The cutting blade portion 20a of the auxiliary cutting blade body 20
are protruded outward from the ends of the cutting blade body 9 in the radial direction of the rotating shaft 8, and are located on the upper and lower outer peripheries of the left and right cutting blade bodies 9, 9 adjacent to this cutting blade body 9. It is bent to allow close polymerization in the direction. Also,
The auxiliary cutting blade body 20 and the cutting blade body 9 to which it is fixed are integrated in a cross shape in a plan view, and the cutting blade portion 20a of the auxiliary cutting blade body 20 is located forward of the cutting blade portion 9a of the cutting blade body 9. .

In the above case, the auxiliary cutting blade bodies 20 may be provided at both ends of the cutting blade body 9 to maintain the weight balance, or may be provided on the left and right cutting blade bodies 9, respectively.

In FIG. 4, the diagram shows in more detail the structure in which the cutting blade body 9 is fixed to the rotating shaft 8. A boss member 23 is spline-fitted to the lower end of the rotating shaft 8 and is fixed by a retaining pin 24. The lower surface of the rotating shaft 8 and the lower surface of the boss member 23 are flush with each other, and the cutting blade body 9 is fixed to both lower surfaces via the bolts 19.
In this case, a wear prevention plate 25 is interposed between both lower surfaces and the cutting blade body 9, and a plurality of disc springs 26 superimposed in the same direction are provided between the cutting blade body 9 and the bolt head. A wear prevention plate 27 is interposed.

Therefore, when the cutting blade body 9 is subjected to an impact load, for example, the cutting blade body 9 is damaged by both wear prevention plates 25,
27 and effectively absorbs the impact. Further, the elastic force of the disc spring 26 is adjusted by the amount of tightening of the bolt 19, thereby making it possible to freely adjust the fixing torque of the cutting blade body 9 to the rotating shaft 8.

According to the configuration shown in FIG. 4, when the cutting blade body 9 slips, the bolt 19 does not rotate together.
The fixing torque of the cutting blade body 9 to the rotating shaft 8 can be maintained at a constant level, which is advantageous because a constant and reliable buffering effect can be obtained. Further, even if the width of the cutting blade body 9 is small, a large amount of spring force can be secured by the disk spring 26, and the configuration is simple and advantageous.

According to the present invention, since the cutting blade body 9 is arranged substantially linearly in the lateral direction, the front and rear dimensions of the mower 1 are particularly compact, and at the same time, the cutting width is widened, and the efficiency of mowing work is improved. It is beneficial. Furthermore, since the auxiliary cutting blade 20 cuts off uncut grass that occurs in the gaps between adjacent cutting blades 9, grass mowing can be accomplished over the entire width of the cutting blade 9 without leaving any uncut grass. It is beneficial.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIG. 1 is an overall plan view thereof, FIG.
The figure is a view taken along the - line in FIG. 1, and FIG. 4 is a sectional view taken along the - line in FIG. 1... Mower, 9... Cutting blade body, 20... Auxiliary cutting blade body.

Claims (1)

[Scope of utility model registration request] A plurality of cutting blade bodies 9 rotating around a vertical axis are arranged substantially linearly in the horizontal direction and spaced apart at substantially the same height,
An auxiliary cutting blade body 20 is protruded from one of the cutting blade bodies 9, and the auxiliary cutting blade body 20 is vertically close to the outer circumference of the rotation locus of the cutting blade body 9 adjacent to this cutting blade body 9. A mower cutting blade device characterized in that it is formed to be polymerized.