KR20130094910A

KR20130094910A - A safety cutting blade for grass eliminator

Info

Publication number: KR20130094910A
Application number: KR1020120016168A
Authority: KR
Inventors: 송운주
Original assignee: 송운주
Priority date: 2012-02-17
Filing date: 2012-02-17
Publication date: 2013-08-27

Abstract

PURPOSE: A safety blade for a grass cutter is provided to improve cutting efficiency and to prevent the engine of the grass cutter from being overloaded by reducing the weight of the blade. CONSTITUTION: A safety blade (20) for a grass cutter is attached to the rotary shaft of a grass cutter head. The blade comprises a rotary plate (22) and a cutting blade (24). A shaft holes (21) attached to the rotary shaft of the grass cutter head is punched in the center of the rotary plate. The cutting blade is combined with the outside of the rotary plate by a hinge (24c) and is pulled back when collides with stones or the rocks. The cutting blade is made of plastic materials.

Description

Safety blades for lawn mowers {A Safety cutting blade for grass eliminator}

The present invention relates to a blade of the lawn mower, and in detail to effectively cut off the stones and various debris from the ground when cutting the weeds or grass without a safety device such as a separate safety cover or safety plate It relates to a safety blade for mowers that has the same effect as cutting twice.

In general, a lawnmower used to remove grass, weeds, etc. is mainly used by mounting the stationary outer blade 2 on the rotating shaft of the lawnmower head 1, as shown in FIG. Even with a mower attached with a safety cover (not shown), when the blade hits the ground stone or the like, the fragments may spring up and cause injury to the worker, so it is necessary to be careful.

Meanwhile, in order to solve the problem of the fixed outer blade, a blade that can be folded when the blade is impacted is also used, and various types of safety plates (such as a frame or comb of a barrican) are attached below or above the blade. In this case, the head of the mower becomes heavier and the work becomes more difficult and inconvenient when moving. In addition, when you want to remove the scum, the safety plate had to be removed again. There was a problem in that the cost was also increased because these safety devices had to be purchased separately.

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention can effectively prevent the debris splashing during work without using a separate safety cover or safety plate, and with one cut By providing the same effect as two cutting operations, it provides a safety blade for the lawn mower with an improved structure that can improve the efficiency of the mowing operation, but the safety blade is too heavy to prevent the mowing engine from being loaded. In addition, it is to provide a safety blade for mowers that can be produced at low cost.

In order to achieve the above object, the present invention is a blade formed with a shaft hole in the center so as to be attached to the rotary shaft of the lawnmower head, the blade is a rotary plate with a shaft hole attached to the rotary shaft of the lawnmower head in the center, the outer side of the rotary plate It is made to include a cutting blade which is hinged to the stone or rock back when hitting, such cutting blade provides a safety blade for mowing made of a plastic material.

In a preferred embodiment of the present invention, the cutting blade is composed of a lower blade located close to the ground, and the upper blade spaced apart from the lower blade and positioned on the lower blade to form a double blade structure.

More preferably, the present invention provides a safety blade for mowers, wherein the cutting blade is a double blade, but the upper blade is disposed in front of the lower blade in the direction of rotation.

In the present invention, the upper and lower blades may be manufactured in a form of being integrally formed or assembled separately so as to be able to adjust the mutually shifting angle.

In a preferred embodiment of the present invention, the spacing between the upper and lower blades is formed in a shape that is maintained in parallel from the center to the outer edge of the blade.

In a preferred embodiment of the present invention, the phase angle, which is a deviation degree between the upper and lower blades, is composed of an angle of 5 to 15 degrees with respect to the rotation direction.

The present invention consists of a safety blade is a rotating blade and a cutting blade hinged to the outer edge of the rotating plate, the cutting blade is made of a double, the upper blade is disposed so as to be located in the front of the rotation direction than the lower blade is a stone of the ground When the debris is bounced off, the upper blade located in front of the lower blade also serves as a safety cover, thereby effectively preventing the debris from popping up, thereby preventing safety accidents, and when the rotating shaft rotates, the phase is different. The lower blade and the upper blade are rotated at the same time, so that two cutting operations are made in one cutting, so that the cutting of grass or weeds is made more clean, so that the efficiency of mowing can be improved, and the cutting blade is made of light plastic material. Excessive weight of blade cuts to mower engine It has a useful effect that can prevent jamming.

1 is a perspective view showing a blade mounting state of the existing lawn mower,
2 is a perspective view of a safety blade according to an embodiment of the present invention,
3 is a plan view of a safety blade according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments that do not limit the present invention will be described in detail.

Figure 2 shows a safety blade according to an embodiment of the present invention, in the present embodiment is a blade 20 attached to the rotary shaft of the mower head 10, the blade 20 is attached to the rotary shaft of the mower head Including a rotating plate 22 is a shaft hole 21 is formed in the center and a cutting blade 24 is coupled to the outer side of the rotating plate 22 by a hinge 24c and flipped back when hit against a stone or rock, etc. It is made, the cutting blade 24 is made of a plastic material.

In the present invention, the cutting blade 24 may be made of an outer blade, but in the embodiment shown in the drawing, it is formed in the form of a double blade, which is located near the ground, the lower blade 24a, the lower blade 24a and The upper blade 24b is spaced apart and positioned above the lower blade 24a.

3 is a plan view of the safety blade 20 according to another embodiment of the present invention, the basic structure is the same as the embodiment shown in Figure 2, except that the cutting blade 24 is located close to the ground A lower blade 24a on the plate, and an upper blade 24b spaced apart from the lower blade 24a and positioned above the lower blade 24a and disposed to be offset from the lower blade 24a. The blade 24b is characterized in that it is arranged to be located in the front of the rotation direction than the lower blade 24a.

In the safety blade 20 according to the present invention, the rotating plate 22 may be formed in a rectangular shape or a circular shape as shown in the drawing, and a cutting blade 24 attached to the outer side of the rotating plate 22 is also illustrated. As shown in Figure 2 may be attached to the left and right, and three or more of the radial number of course may be arranged at the same angle.

In addition, in the present invention, the cutting blade 24 may be formed in a tapered shape in which the width of the blade becomes narrower from the inner side to the outer side, or the width of the cutting edge may be manufactured in the same shape from the inner side to the outer side.

In the present embodiment, the distance between the lower blade 24a and the upper blade 24b forming the cutting blade 24, that is, the height difference, is appropriately about 10 to 30 mm, which is too much between the upper and lower blades. When it is narrow, it is to prevent the grass or weed debris from being cut into the space between the upper and lower blades. Afterwards, it is common to cut secondly shortly, because cutting the grass or weeds at a time causes the grass or weeds to fall and take too much resistance on the blade, which causes the blade not to rotate properly and gets tangled. In the present invention, when the gap between the upper and lower blades is manufactured in the range of 10 to 30 mm, the cutting is performed twice with one cutting. It was confirmed that the effect occurs.

In the present invention, it is preferable that the offset angle between the upper and lower blades 24b and 24a, that is, the phase angle, is disposed so as to be about 5 to 15 degrees with respect to the rotational direction. The upper and lower blades 24b and 24a are disposed. This is because when the phase is placed in the same phase or when the phase angle is placed too large, the upper blade 24b does not function properly as well as a problem that excessive resistance is applied during rotation. .

In the present embodiment, the upper blade 24b and the lower blade 24a are integrally coupled by the hinge 24c.

Meanwhile, in the present invention, the lower blade 24a and the upper blade 24b are named 'lower' and 'upper', respectively, for convenience of description, which are terms used only for convenience of explanation, and upper and lower blades. In other words, the lower blade (24a) can be used to be mounted on the rotating shaft so that the upper portion, of course, the upper and lower blades (24b, 24a) is composed of a two-degree blade in both front and rear blades are erected Therefore, the blade can be used upside down, so if the edge is blunt, the blade can be used upside down to improve the efficiency of mowing and double the utility of the blade.

The plastic used as the material of the upper blade or the lower blade in the present invention can be used to grind the grinder and the like with the same tips as the existing metal blade when the blade is dull by the use of lightweight yet tough, and the plastic blade is broken In case of heavy wear or wear, it is more economical because it can be replaced with new one.

In addition, the plastic that can be used as the blade material of the present invention can be used a variety of plastic materials, including polycarbonate, if necessary it is possible to put the reinforcing fiber net or other reinforcing materials therein.

In the safety blade of the present invention configured as described above, when the blade is rotated to cut grass or weeds, the upper blade 24b is located ahead of the lower blade 24a, so the upper blade 24b primarily cuts the grass or weeds. It is cut to a certain length, and subsequently, the lower blade 24a cuts the grass or weeds cut primarily by the upper blade 24b in a second time, so that the effect of two cuttings in one operation occurs. .

In addition, the safety blade of the present invention is a lower blade (24a) located relatively close to the ground when the debris generated by hitting the stone, etc. of the ground bounces upwards, the debris is installed in front of the lower blade (24a) of the upper blade ( 24b) hits the bottom surface and bounces back to the ground. At this time, the part where the debris bounces is still cut in the grass or weeds for the first time, so the debris falls off as the impact is absorbed by the grass or weeds. It is also effective to prevent bumping up again. When mowing using only one blade, the debris is scattered upwards and injuries to the worker's body. It can be exercised.

In addition, the safety blade of the present invention because the upper and lower blades are rotated at the same time, while the centrifugal force is greatly generated, the grass and weeds, as well as having a thicker than the thick, has a useful effect to work more effectively.

20: safety blade
21: shaft hole
22: rotating plate
24: cutting blade
24a: lower blade
24b: upper blade
24c: hinge

Claims

With a blade 20 attached to the rotating shaft of the lawn mower head 10;
The blade 20 is coupled to the rotating plate 22, the shaft hole 21 is attached to the rotary shaft of the mower head in the center and the hinge 24c on the outside of the rotating plate 22 to hit the stone or rock When the blade is made to include a cutting blade 24 is rolled back, the cutting blade 24 is a safety blade for mowers, characterized in that made of a plastic material.

The method according to claim 1,
The cutting blade 24 is a mower, characterized in that the lower blade (24a) located close to the ground, and the lower blade (24a) spaced apart from the upper blade (24b) located on the lower blade (24a) Dragon safety blade.

The method according to claim 2,
The upper blade (24b) is a safety blade for mowers, characterized in that disposed to be located in the front of the rotation direction than the lower blade (24a).
Claims

The method according to claim 2 or 3,
Safety blade for mowers, characterized in that the separation interval of the lower blade (24a) and the upper blade (24b) is 10 ~ 30mm.