JPH0728817Y2 - Mowing blade for mower - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to the structure of a mowing blade for a mowing machine, and more specifically, it has a mowing function that does not leave uncut material even on soft grass or lawn. The present invention relates to improvement of a cutting blade on the outer peripheral edge of a wing that can be exerted.

[Conventional technology]

FIG. 6 is a perspective view showing an example of a backpack-type mower. As shown in the figure, the main body of the mower (1) includes a backpack belt (2), a backpack plate (3), a small engine (5) fixed on the frame (4), and an output of the small engine (5). It consists of flexible shafts (6a) (6b) connected to the shaft, bellows (7a) (7b), and rod (15),
At the tip of the flexible shaft (6b), a disc-shaped circular saw tooth (not shown) is formed by forming a saw-tooth-shaped blade on the peripheral portion, or a front edge and a rear edge as shown in FIG. Mowing blade (10) consisting of two substantially rectangular wing bodies (9) (9) forming straight blade portions (8a) (8b), or a straight line at the front and rear edges A blade (not shown) having three or more blades each having a blade portion formed in a radial shape is rotatably attached. Incidentally, (11) is an angle converting device for the register mark blade (10), and (12) is an operation handle.

The rotational driving force generated by the startup of the small engine (5) is applied to the front edge and the rear edge of the rod (15) attached to the tip of the rod (15) from the output shaft of the engine through the flexible shafts (6a) (6b). It is transmitted to the mowing blade (10) having a substantially rectangular wing body (9) formed with straight blade portions (8a) and (8b). The main body (1) of the mower is carried on the back using the backpack belt (2) and the backpack plate (3), and the operating handle (12) is gripped to swing the rod (15) to remove the brush blade (10). ) Mow grass, lawn, or sward that grows on the ground.

[Problems to be solved by the device]

The cutting blade (10) having a plurality of blade bodies (9) having straight blade portions (8a) (8b) formed on the leading edge portion and the trailing edge portion illustrated in FIG. Since a shearing force is applied to the etc. from the side, a good weeding ability can be exhibited even when tall weeds and cypress are densely populated. On the other hand, when cutting grass that is relatively soft, the grass pushed by the straight blade (8a) collapses because the grass is weak, and the grass blade (10) remains in the radial direction without being cut. Run away to the outside. For this reason, the uncut phenomenon occurs and not only the intended purpose is not achieved, but also the efficiency of the cutting operation is significantly reduced.

[Means for Solving the Problems]

As a means for solving the above problems, the present invention is provided with a plurality of wing bodies centered on a fitting support hole for fixing to a mower,
And, in a mowing blade for a mower in which a straight blade portion is formed on the front and rear edges of the wing body, a plurality of serrated blade portions is formed on the outer peripheral edge portion of the wing body so that the blade edge faces in the rotation direction. In addition, the blade edges of the plurality of serrated blades are formed so as to alternately face upward and downward with respect to the object to be cut.

Further, the present invention provides that the cutting edges of the plurality of sawtooth blades described above are
It may be formed equidistant from the center point of the fitting support hole, or the cutting edge may be formed so as to be gradually separated from the center point of the fitting support hole.

[Action]

The fitting support holes are fitted and fixed in the mower, and the plurality of wings are rotated. A straight blade formed on the front edge of the wing body cuts grass, grass and other objects to be cut. Grass or the like that has been pushed directly by the blade portion and collapsed escapes toward the outer side in the radial direction of the wing body.
The escaped grass or the like is reliably captured and sheared by the saw-tooth blades formed in the vertical direction on the outer peripheral edge of the wing body.

As a result, even when the grass and the turf are soft, it is possible to perform an efficient brush cutting operation with almost no uncut residue.

By forming the cutting edges of a plurality of serrated blades at equal distances from the center point of the fitting support hole, all cutting edges follow the same rotation trajectory when viewed from above, and grass or the like is attached to the outer peripheral edge of the blade body. It has the effect of focusing and shearing.

Also, by forming each blade edge stepwise farther from the center point of the fitting support hole, grass or the like that could not be sheared by the first sawtooth blade portion is immediately caught by the trailing sawtooth blade portion. It can be sheared.

〔Example〕

FIG. 1 is a top view showing a specific example of a mowing blade for a mowing machine according to the present invention, FIG. 2 is a partially enlarged top view of the essential part, and FIG. 3 is a second specific example of the mowing blade. And FIG. 4 is a top view showing a third specific example of the same cutting blade. In the following description, the same components as those in FIGS. 5 and 6 showing the prior art will be denoted by the same reference numerals, and the description of the overlapping matters will be omitted.

As shown in FIG. 1 and FIG. 2, the mowing blade is a mowing blade, which is commonly referred to as a dragonfly blade, provided with two blades (9) (9). The wing body (9) has a substantially rectangular shape or a rhombic shape as a whole, and has a fitting support hole (1) at the center of the flexible shaft (6b) along the longitudinal direction.
3) is formed, and downward blades (8a) (8b) are formed at the front edge of the wing body (9) located forward in the rotational direction (F). Further, linear blade portions (8b) (8b) are formed at the trailing edge portion of the blade body (9) located rearward with respect to the rotation direction (F). Then, on the outer peripheral edge portions on both sides of the wing body (9), saw blade-shaped blade portions (14a) (14b) each having a flat shape like a sickle at a predetermined pitch.
(14c) is formed in a state where the cutting edge is alternately changed upward and downward like a saw tooth.

Saw-toothed blades (14a) (14b) by repeated mowing work
When (14c) is chipped or worn, a new sawtooth-shaped blade (14a) is used by using a cutting tool such as a rod file as shown by the chain double-dashed line in FIGS. 1 and 2. ′) (14b ′)
(14c ') or (14d) (14e) (14f) is formed. The shape of the outer end of the wing body (9) is such that when the serrated blade (14a) located at the head is damaged, the next serrated blade (14b) falls radially outward. Formed at the same distance from the center point (O) of the fitting support hole (13) so that the same focusing shearing function can be exerted on grass and turf so that each cutting edge draws the same rotation trajectory. You may comprise. Alternatively, as shown in FIG. 3, a plurality of serrated blades (14
a) The blade edges of (14b) and (14c) are formed so as to be gradually separated from the center point (O) of the fitting support hole (13) in the rotational direction with respect to the longitudinal axis of the blade body (9). It is also possible to arrange them so as to line up on a straight line III-III inclined by 45 ° to 60 ° from the front end to the rear end along (F). If the sawtooth-shaped blade (14a) located at the most tip with respect to the direction of rotation (F) hits a stone or the like and breaks,
Similarly to the one shown in the figure, the next saw-tooth-shaped blade portion (14b) exerts a main focusing shearing function on grass and grass that have fallen toward the outer side in the radial direction of the wing body (9), and the second saw-tooth blade Blade (14
When c) is damaged, the sawtooth-shaped blade portion (14c) located at the rearmost end in the rotational direction (F) exerts a main focusing shearing function on the grass and grass. If the above sawtooth blades (14a) (14b) (14c) have poor sharpness or the breakage condition exceeds the specified limit with the lapse of usage period, use a cutting tool such as a stick file. Then, as shown by the black arrow in FIG. 3, polishing is performed in a direction orthogonal to the longitudinal axis of the wing body (9), and new sawtooth blades (14a ') (14b') are formed. ) (14c ') is reformed so that each cutting edge faces upward and downward with respect to the object to be cut. In FIG.
The new serrated blade (14
a ') (14b') (14c '), when there is no room to re-form,
That is, a new cutting blade (for example, 14
a ″) is formed by polishing. Thus, the wing body (9) is formed.
The serrated blades (14a) (14b) (14
By arranging the blade edge of c) on the inclined straight line III-III, the composite cutting function of the linear blade portions (8a) (8b) and the serrated blade portions (14a) (14b) (14c). The grass cutting mechanism has a high mowing capacity in which the shear load of grass and grass is gradually reduced from the foremost serrated blade (14a) to the following serrated blades (14b) (14c). Is formed.

Further, FIG. 4 shows a specific example of the cutting blade (10) in which three blades (9) are radially provided. Each blade (9)
Straight blades (8a) (8b) and serrated blades (14
The arrangements of a), (14b) and (14c) are the same as in the case of the specific example shown in FIG.

As described above, with respect to the grass and the grass which are laid down radially outward by the linear blade portions (8a) (8a) provided on the front edge portion of the wing body (9) based on FIGS. 1 to 4. The specific example in which the serrated blades (14a) (14b) (14c) provided on the outer peripheral edge of the wing body (9) exert the focusing shear function has been described. (9) may be used upside down. In this case, the saw-tooth-shaped cutting blades (14a) (14b) (14c) opened in the focusing direction are closed in the approaching direction of grass and lawn, and thus exert a focusing shearing function. I can't. In order to remove this restriction on use, when the brush cutter (10) is turned upside down and the linear blades (8b) (8b) provided at the trailing edge are used, see FIG. Alternatively, the outer peripheral edge portion of the blade body (9) shown by the alternate long and short dash line II-II in FIG. 3 is cut off, and inside the alternate long and short dash line II-II, the serrated blades (14a) (14b) (14c) A new serrated tooth portion (not shown) having the opening direction of is formed by polishing.
In the embodiment shown in FIG. 1 to FIG. 3, three blade teeth (14a) (14b) are formed on the outer peripheral edge of the blade body (9) in a sawtooth shape.
(14c), (14a) (14b) (14c) are provided,
The scope of rights of the present invention should not be limitedly interpreted by this exemplary description, and many variations can be implemented. For example, four or five sawtooth-shaped blades are concentrically arranged on the outer peripheral edge of the blade body (9) around the center point (O) of the fitting support hole (13) with a predetermined pitch. It is also possible to form them in an arranged state.

[Effect of device]

By using the bush cutting blade according to the present invention, even when cutting soft grass or grass with a weak waist, grass and grass that have escaped outward in the radial direction of the cutting blade are formed alternately upward and downward. The shearing force that is captured by the serrated blade that has been cut is necessary for brush cutting. As a result, it is possible to secure an efficient cutting condition, which is almost the same as when the circular saw blade and the blade-shaped blade are used in combination. If the serrated blade becomes worn or damaged, a new cutting blade should be formed below it by polishing, or only the outer edge along the longitudinal direction of the wing should be cut off. Since a new sawtooth-shaped blade can be formed inside the blade, a remarkable effect can be exerted also for improving the durability of the cutting blade.

[Brief description of drawings]

FIG. 1 is a top view showing a specific example of a mowing blade for a mower according to the present invention, FIG. 2 is a partially enlarged top view thereof, and FIG. 3 is a register mark blade main body showing a second specific example of the present invention. Partial enlarged top view of
FIG. 4 is a top view showing a third embodiment of the present invention. Further, FIG. 5 is a top view of a conventional brush cutter, and FIG. 6 is a perspective view showing an example of a backpack-type mower. (1) …… Mower, (8a) (8b) …… Straight blade,
(9) …… Wing body, (10) …… Mowing blade, (14a) (14b)
(14c) …… Saw-toothed brush blade.

Claims (3)

[Scope of utility model registration request] 1. A mower for mower in which a plurality of blades are provided around a fitting support hole for fixing to a mower, and straight blades are formed at front and rear edges of the blades. In the blade, a plurality of serrated blades is formed on the outer peripheral edge of the wing body so that the blades are oriented in the rotational direction, and the blades of the plurality of serrated blades are alternately turned upward with respect to the object to be cut. A brush cutter for a mower, which is formed so as to face downward. 2. The cutting blade for a mower according to claim 1, wherein the blade edges of the plurality of serrated blades are formed equidistant from the center point of the fitting support hole. 3. The mowing machine for mower according to claim 1, wherein the cutting edges of the plurality of serrated blades are formed so as to be gradually separated from a center point of the fitting support hole. Blade.