JP3005418U - Mowing blade mounting structure for mowers - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a technology that allows the cutting blade to rotate freely and to be detachable so that it has a bolt tightening structure, and that the bolt can be removed to prevent the cutting blade from being blown away for safe work. [Structure] Stay 1 fixed to drive shaft 7 of mower body 6
A bolt 4 in which one end of the cutting blade 2 is superposed on the lower end side of the tip and inserted into the through holes 13 and 16 provided in the superposing portion from below.
In the structure in which the cutting blade 2 is detachably connected to the stay 1 in a freely rotatable state by providing a gap between the cutting blade 2 and the stay 1 on the upper surface side of the cutting blade 2 and tightening the nut 4b, the nut 4b is tightened. A structure in which a cap 5 surrounding the portion is provided on the upper surface of the stay 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutting blade mounting structure for a mower.

[0002]

[Prior art]

 Some cutting blades of conventional lawn mowers that cut grass with a rotating blade are designed to rotate freely to protect the blade when pebbles, etc., or large resistance is applied during mowing. With such a structure, one end of the cutting blade is superposed on the lower surface of the tip of the stay fixed to the drive shaft on the machine side, and the bolts inserted from below are inserted into the upper and lower through holes in the superposed section. , The cutting blade is mounted by leaving a gap between the stay and the cutting blade and tightening the nut on the upper surface of the cutting blade. The nut is locked with a cotter pin to prevent it from loosening and coming off the bolt during use. A collar slightly thicker than the thickness of the stay is attached to the stay-side through hole, and a nut is tightened through this color to provide a gap between the stay and the cutting blade.

[0003]

[Problems to be solved by the device]

 However, in this conventional lawn mower blade mounting structure, the area around the nut tightening part is exposed on the upper surface of the stay. There is a case that it directly collides with the pin and destroys the split pin. When the cotter pin was destroyed, there was a problem that the nut was loosened, the bolt was removed, and the cutting blade was blown away by centrifugal force, causing an accident.

The present invention has been made in order to solve the above-mentioned conventional problems, and its object is to have a bolt tightening structure for freely rotating the cutting blade and making it detachable. An object of the present invention is to provide a safe blade mounting structure for a mower in which the bolt does not come off and blow the blade.

[0005]

[Means for Solving the Problems]

 As means for achieving the above object, in the present invention, one end of a cutting blade is superposed on the lower surface side of a stay tip fixed to a drive shaft of a mower body, and the cutting blades are inserted from below into through holes provided in the superposing portion. In the structure in which the cutting blade is detachably connected to the stay in a freely rotatable state by tightening the nut with a gap between the stay and the stay on the upper surface side of the cutting blade, an annular ring surrounding the nut tightening part. The standing body is provided on the upper surface of the stay.

[0006]

[Action]

 In the lawn mower mounting structure of the present invention, since the annular edging body is arranged so as to surround the nut tightening portion, small stones bounced up by the stay or the cutting blade against nuts or split pins. Even in the collision direction, since the annular edging body hits and bounces back, the split pin can be protected and the nut can be prevented from loosening, and blow off of the cutting blade can be prevented.

Since the annular edging body may be small, it does not reduce the efficiency of mowing, and the structure is simple, so that it can be provided at low cost.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view showing a cutting blade mounting structure of a mower according to the present embodiment, FIG. 2 is a plan view showing essential parts of the same, FIG. 3 is a cross-sectional view showing a cap, and FIG. 4 is a cross section taken along line 1B-B of FIG. It is a figure.

First, the configuration of the embodiment will be described. The cutting blade mounting portion A of this embodiment mainly includes a stay 1, a cutting blade 2, a collar 3, bolts, nuts 4a and 4b, and a cap 5.

The stay 1 is fixed to a drive shaft 7 of a machine body 6, and a boss 9 having a spline hole 8 in the center is fixed by a bolt 10, and the spline hole 8 is attached to the drive shaft 7. It is rotatably fixed by being tightened with a nut 12 after being inserted into the spline shaft portion 11 of No. 7. Further, a through hole 13 is formed on the tip side of the stay 1. In the figure, reference numeral 14 is a pulley that connects the drive shaft 7 to a drive unit, and 15 is a protector.

The cutting blade 2 is attached to both ends of the stay 1, and has a rectangular through hole 16 at one end.

The collar 3 allows the cutting blade 2 to freely rotate with respect to the stay 1, and is formed to be slightly thicker than the thickness of the stay 1 and has an outer diameter slightly smaller than the through hole 13. ing.

The bolt 4 a attaches the cutting blade 2 to the stay 1 in a detachable manner, and the neck portion is formed into a square shape having the same shape as the through hole 16. The nut 4b is a grooved nut, and is fixed by a split pin 17 to prevent rotation after bolting.

The cap 5 serves as an annular edging body, and has an annular edging portion 19 in a seat portion 18 that is appropriately wider than the nut 4b, and the seat portion has an insertion hole 20 for the bolt 4a. Has been drilled.

In the cap 5 of this embodiment, the cutting blade 2 is placed on the lower surface side of the stay 1, and the collar 3 is attached to the through hole 13 of the stay 1, and the bolt 4a is inserted from the bottom of the cutting blade 2 into the stay 5. The vertical edge portion 19 of the cap 5 is inserted into the screw portion projecting from No. 1 so as to face upward, the spring washer 21 is inserted from above, and then the nut 4b is tightened. After tightening this nut 4b, insert the split pin 17 into the small hole formed in the tip of the screw and the groove of the nut, and open the tip of the split pin to prevent the nut 4b from rotating, and with this the cutting blade 2 is attached.

Next, the operation of the embodiment will be described. The pebbles that the stay 1 and the cutting blade 2 that have been rotated by the drive shaft 7 have jumped up are removed to the outside by the vertical edge 19 of the cap 5 before they collide with the nut 4b and the split pin 17, The split pin 17 is prevented from being broken. In this way, the split pin 17 can be prevented from being broken even if a small stone or the like is flipped up. Therefore, the nut 4b does not loosen, and the bolt 4a attaching the cutting blade 2 to the stay 1 is always tightened with the nut 4b. Can be set. The cap 5, split pin 17, nut 4b, etc. should be replaced at an appropriate time without fail.

As described above, in the cutting blade mounting structure of the mower of this embodiment, the cap 5 prevents the split pin 17 from being broken by small stones, so that the nut is loose and the bolt is It is possible to always tighten the bolts with nuts without falling off, so that the mowing work can always be performed safely without causing a blow-off accident of the cutting blade 2.

The cap 5 may be a small one as long as there is enough space for the tool for tightening the nut 4b to be inserted therein. Therefore, the cap 5 does not reduce the mowing efficiency, and the structure is simple, so that the cap 5 can be provided at a low cost. it can.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and even if there are design changes and the like within the scope not departing from the gist of the invention. Included in the present invention.

For example, the standing edge portion 19 can be formed by a plate-shaped outer portion, a ring-shaped portion made of round steel, or the like.

[0021]

[Effects of the Invention] As described above, the cutting blade mounting structure for a mower according to the present invention has the above-described structure. Therefore, the split pin that prevents the nut from rotating by the annular edging body is a small stone. Protecting against collision of the pebbles, the nut is not loosened and the bolt does not fall off due to the breakage of the split pin by this small stone, and the bolt can always be tightened with the nut, thus causing a blow-blade accident. Without it, you can always mow safely. Since the annular edging body can exhibit its function sufficiently with a small one, it does not reduce the efficiency of mowing, and the structure is simple, so that it can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a cutting blade mounting structure of a mower according to an embodiment of the present invention.

FIG. 2 is a plan view showing a main part of the embodiment.

FIG. 3 is a cross-sectional view showing the cap of the embodiment.

FIG. 4 is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

 A Cutting blade attachment part 1 Stay 2 Cutting blade 4a Bolt 4b Nut 5 Cap (annular edging body) 6 Machine body 7 Drive shaft 13 Through hole drilled at the tip of stay 16 Through hole drilled at one end of the cutting blade

Claims (1)

[Scope of utility model registration request] 1. A stay blade fixed to a drive shaft of a mowing machine body has one end of a cutting blade overlapped with a lower end side of the stay, and a bolt inserted from below into a through hole provided in the overlapping portion is stayed on the upper surface side of the cutting blade. By making a gap between and tightening the nut,
In a structure in which a cutting blade is detachably connected to a stay in a freely rotatable state, an annular standing body surrounding the nut tightening portion is provided on an upper surface of the stay, and a cutting blade mounting structure for a mower.