KR101658165B1

KR101658165B1 - Folded blade for lawn mower

Info

Publication number: KR101658165B1
Application number: KR1020160060292A
Authority: KR
Inventors: 김일환
Original assignee: (주)아이디알
Priority date: 2016-05-17
Filing date: 2016-05-17
Publication date: 2016-09-20

Abstract

The present invention relates to a folding blade for a grass mower. The folding blade for a grass mower is constructed by mounting a plurality of folding blades on a rotary plate placed on a grass mower workbench to be driven by an engine. The folding blades are formed in various shapes including a circle, an ellipse, and a fan shape. The weight of the folding blade is horizontally symmetric about a Y-axis based on a hinge hole for mounting the folding blade on the rotary plate when divided into two parts. When dividing the folding blade into two parts on an X-axis transversely connecting the hinge hole and a free end on the opposite side of the hinge hole, the free end side composing a cutting blade has a round circumferential surface regardless of a shape and a form of the hinge hole side. A space is formed by punching a middle side of the folding blade to reduce the weight. A weight rib is formed on the free end side composing the cutting blade. A plurality of cutting grooves are formed on the cutting blade of the folding blade. A chamfered portion is formed on a corner of the hinge hole side of the cutting groove and a beak is formed on a corner of the free end side of the cutting groove to form a hook shape from the free end side to the hinge hole side.

Description

{Folded blade for lawn mower}

The present invention relates to a folding blade for lawn mower, and more particularly, to a folding blade for a lawn mowing machine, more particularly, to a folding blade for folding a rotary plate mounted on an end of a lawn mowing machine for pivoting by an engine, The cutting edge of the folding blade which is stretched by the centrifugal force is positioned at the cutting position precisely, and the cutting blade slices the vegetation. The present invention relates to a folding blade for a lawn mowing machine, wherein an impact given to a folding blade when the blade strikes a stone or other foreign object acts in the circumferential direction of the folding blade so as to smoothly respond without bouncing.

Generally, a mowing machine which is carried on the back is a main power source of a small engine, and a high speed rotating power is transmitted to a wire so as to be rotatable on the end of a workbench so that a mowing machine blade rotating is approached to a weed or a knife, It will perform the mowing work.

However, in the case of performing the mowing work in the place where the weeds and the bamboo grass are grown as described above, it is not easy to find the stones or other hard foreign objects stuck on the ground. In the mowing process, Or broken on the ground floor, splashes of broken knives, stones, and the like are splashed, resulting in a safety accident that injures the operator.

Accordingly, a folding type folding blade has been developed and used in which the blade for cutting the vegetation is rotatably attached to the rotating body in order to prevent safety accidents while cutting the vegetation so far.

The patent literature of the prior art that has been developed so far will be described as follows.

The patent application No. 10-2012-0024855 (2012.03.12) allows a rotating blade to have a round, semicircular or elliptical curved surface so that when the curved blade hits an obstacle, The present invention relates to a blade for a lawn mowing machine capable of preventing a safety accident at the time of mowing operation by cutting a blade or the like, wherein a coupling hole is formed at the center, and the first and second blade portions Wherein the first and second blade portions are formed in a semicircular shape and have a cutting edge having an upper and a lower cutting inclined surface along an outer surface rim. Patent Application No. 10-2013-0042747 (Apr. 18, 2013) discloses a grass cutter blade, which comprises a rotating body made of a synthetic resin or an alloy and a cutting blade made of high carbon steel, Which is mounted on the end of a workbench of a lawn mowing machine and is divided into a rotating body and a cutting blade so that the cutting blade is moved by a centrifugal force, The rotating body is divided into a lower disc and an upper disc made of a synthetic resin or an alloy, and at least two or more cutting blades are formed when the blades are engaged. The cutting blade, which is separately formed in the cutting blade mounting portion, A plurality of air layer forming air holes formed on an outer surface of a lower disk constituting a rotating body, A groove is formed and a semicircular cutting groove arranged at equal intervals is formed on the front surface forming the involute curve of the cutting blade so that the blade is always hidden inside the body when the blade does not rotate, A plurality of air guide grooves formed on the outer surface of the rotating body to form an air layer on the lower side of the rotating body while the rotating body is lifted at a predetermined distance from the ground surface and spaced apart from the ground surface to receive weight, Since the cutting edge is protruded by centrifugal force, it protects the cutting edge as well as is safe for handling. The cutting edge is protruded by the involute curve around the rotation direction side tip, When it hits an external obstacle, the cutting blade is inserted into the inside of the rotating body. It is easy to maintain and easy to maintain by separating only the lower disc and cutting the blade only when the blade is worn by repeated use. Create an effect. The patent application No. 10-2015-0096204 (2015.07.06) not only facilitates the replacement of the blades, but also makes it possible to use both of the blades in both directions, thereby greatly increasing the replacement period of parts, Which can reduce the maintenance cost according to the present invention. A utility model registration application No. 20-2004-0011051 (2004.04.21) relates to a blade of a grass cutter, which makes a buffer groove at both ends of the blade of a grass cutter and breaks the blade when a blade is used. The cutting blade formed on both sides of the cutting blade has a serration-like cutting groove formed at both ends of the blade at the both ends of the blade, The blade and the blade-like cutting blade are arranged to be offset from each other A utility model registration application No. 20-2005-0016073 (Jun., 2005) relates to a blade for lawn mowers, more particularly, a blades for unfolding during rotation to allow the grass to bend, The present invention relates to a blade for a lawn mower to be secured to a rotary shaft of a lawn mower head. The lawn mower blade is provided with a plurality of blades The blade is located at the bottom of the disk, and the blade is spread out from the bottom of the disk when the rotary shaft is rotated, so that the blade is cut and the blade is moved to the object Thereby preventing breakage of the blades when collided. More particularly, the present invention relates to an improvement of a blade for a lawn mowing machine, and more particularly, to a blade having a cutting blade portion formed on a rotary plate having a rotary shaft coupling portion formed at the center thereof, A plurality of coupling protrusions are formed on an upper surface of a rotary plate, and a female threaded portion penetrating upward and downward is formed in a central portion of each coupling protrusion, so that a coupling hole of the blade is inserted into the coupling protrusion And the upper fastening screw is fastened to the female threaded portion of the coupling protrusion at the upper portion of the coupling protrusion, and a female threaded portion passing through the upper and lower passes is formed at the center of the upper fastening screw, and the lower fastening screw is fastened to the female threaded portion Then, by fastening the safety screw at the upper part of the upper fastening screw so as to come into close contact with the lower fastening screw fastened to the female screw part, The present invention is advantageous in that safety and reliability are greatly improved by forming multiple safety means for preventing arbitrary departure of the coupled blades. Application of Utility Model Registration No. 20-2011-0002138 (2011.03.15), due to the centrifugal force caused by rotation of the rotating body, unfolding occurs, resulting in removal of weeds and scratches, and warping due to impact caused by stones And to prevent safety accidents caused by breakage. The rotating body is formed into a curved shape having a curved shape at the center, and the rim portion of the rotating body is bent in a circular shape to increase the strength of the rotating body. The rotation of the rotating body is prevented by the centrifugal force so that the rotating body is protruded to the outside of the rotating body, Ease of use and storage after use.

However, the lawn mower blade developed so far is configured to be fixed directly to the rotary shaft constituted at the end of the workbench of the lawn mowing machine, or to form a folding blade so that at least two blades are folded on the outer edge of the rotary plate coupled to the rotary shaft. However, The cutting edge of the folding blade, which is formed by centrifugal force, even if the cutting edge of the folding blade is formed in an oval shape, There is a problem in that the efficiency of operation is deteriorated because it is not accurately positioned.

In order to solve the problems described above, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a folding blade which is folded on a rotary plate mounted on an end of a mower work platform for pivoting by an engine, And a cutting blade is formed on the outer edge of the cutting blade so that the cutting blade of the folding blade which is spread by the centrifugal force at the time of rotation is accurately positioned at the cutting position, And it is an object of the present invention to prevent a safety accident from occurring by acting in a circumferential direction of a folding blade so that an impact applied to a folding blade when the blade is struck against a stone or other foreign object smoothly responds without bouncing.

In order to achieve the above object, according to the present invention, there is provided a folding blade for lawn mower which comprises a rotary plate driven by an engine on a lawn mower work table and a plurality of folding blades mounted thereon, The folding blade is formed on the free end side with respect to the hinge hole for engaging with the rotary plate, and the folding blade is provided on the free end side with respect to the Y axis as shown in Figs. 2 to 5, Symmetrically with respect to the hinge axis, and the folding blade is arranged so as to be symmetrical with respect to the shape and shape of the hinge hole when separating the center of the free end opposite to the hinge hole on the basis of the X axis shown in Figs. 2 to 6 Wherein the free end side constituting the cutting blade is constituted by a round circumferential surface, wherein the center side of the folding blade is punctured to form a space to reduce the weight, And a cutting edge of the folding blade forms a plurality of cutting grooves, and the cutting groove has a chevron-side edge at a free end side so as to have a prism shape, and a hinge hole side edge has a chamfered portion And the free end side edge forms a beak.

In the present invention, a folding blade is folded on a rotary plate mounted on an end of a mower work platform so as to rotate by an engine in a coupling hole for coupling the folding blade to a rotary plate, and the folding blade is rotatably coupled to the rotary plate, The cutting blade is cut to a shape that cuts the vegetation while the cutting blade of the folding blade spread by centrifugal force is positioned at the cutting position precisely at the time of working, The impact is applied in the circumferential direction of the folding blade, so that it does not bounce and smoothly responds to prevent a safety accident. In addition, the cutting edge has a hook shape and a gentle inner edge, So that it is easy to use.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exemplary view showing a state in which a folding blade of the present invention is assembled to a rotating plate;
Fig. 2 is a view showing a configuration state of a folding blade according to the present invention; Fig.
Fig. 3 is an exemplary view showing a state in which the folding blade of the present invention is punched.
4 is a diagram illustrating a state in which the cutting edge of the folding blade of the present invention is formed in a sawtooth shape.
5 is an illustration of various configurations of the folding blade of the present invention.
Fig. 6 is an exemplary view showing a state of a cutting groove constituting a substantial part of a folding blade of the present invention. Fig.

The construction of the present invention will be described in detail with reference to the accompanying drawings.

A folding blade (20) for lawn mowing machine comprising a rotary plate (10) driven by an engine on a lawnmower workbench and a plurality of folding blades (20) mounted thereon,

2 to 6, the folding blade 20 has a hinge hole 25 for engaging with the rotary plate 10, and a hinge hole 25 The free end 23 side is configured such that the nutrient weight is symmetrically symmetrical with respect to the Y axis shown in FIG. 2 to FIG.

The folding blade 20 has a hinge hole 25 formed at the center of the free end 23 opposite to the hinge hole 25 and bisecting the center of the free end 23 along the X axis shown in Figs. Regardless of the shape and the shape of the cutting edge 24, the side of the free end 23 constituting the cutting edge 24 is formed as a round circumferential surface.

A weight 22 is formed on the side of the free end 23 constituting the cutting blade 24 by reducing the weight by forming the space 21 by punching the center side of the folding blade 20.

A plurality of cutting grooves 30 are formed in the cutting edge 24 of the folding blade 20 so that the cutting grooves 30 have a hinged shape at the side of the free end 23 toward the hinge hole 25, The edge on the side of the hole 25 forms the chamfered portion 31 and the edge on the side of the free end 23 forms the beak 32.

Hereinafter, an embodiment of the present invention will be described.

The folding blade 20 for a lawn mower according to the present invention is constituted by constituting a rotary plate 10 driven by an engine on a lawnmower workbench and mounting a plurality of folding blades 20 therein, 6, the folding blade 20 is formed in a circular shape, an elliptical shape, and a fan shape, and the folding blade 20 is formed in a shape corresponding to the hinge hole 25 for coupling to the rotary plate 10, 2 to 5, the folding knife 20 is not limited to the shape of the circle, whether it is circular or elliptical. However, the shape of the folding blade 20 is not limited to the shape of the circle, 2 to 5 on the side of the free end 23 with respect to the hinge hole 25 for joining the folding blade 20 to the folding blade 20, When spread by centrifugal force, Is always in a constant position.

The folding blade 20 has a hinge hole 25 formed at the center of the free end 23 opposite to the hinge hole 25 and bisecting the center of the free end 23 along the X axis shown in Figs. The free end 23 constituting the cutting edge 24 is formed as a round circumferential surface irrespective of the shape and the shape of the cutting edge 24, No matter what shape my inner side is, it is meaningless.

As described above, the center of the folding blade 20 is pierced by the weight of the folding blade 20 to reduce the weight of the operator. At this time, on the side of the free end 23 constituting the cutting blade 24, When the side of the free end 23 constituting the cutting blade 24 is heavier than the side of the hinge hole 25 of the folding blade 20, the centrifugal force is concentrated toward the free end 23, And a large amount of flesh exists on the side of the cutting blade 24, which is strong against the impact against the outside.

Although the cutting blade 24 may be constructed without forming the cutting groove 30 as described above, if the cutting blade 30 or the tooth is formed in the cutting blade 24, the effect will be doubled. In particular, The edge of the groove 30 on the side of the hinge hole 25 is formed with a chamfered portion 31 so that the free end 23 side has a cheek shape from the free end 23 side toward the hinge hole 25 side, The effect will be doubled as a sickle.

The present invention described above can be conveniently used for lawn mowers used in rural areas.

10: spindle 20: folding blade 21: space
22: Weight gain 23: Free end 24: Cutting blade
25: hinge hole 30: cutting groove 31: face mounting
32: Beak

Claims

A folding blade (20) for lawn mowing machine comprising a rotary plate (10) driven by an engine on a lawnmower workbench and a plurality of folding blades (20) mounted thereon,
The folding knife 20 is formed with a hinge hole 25 for engaging with the rotary plate 10 and has a shape of Y (Y) toward the free end 23, The weight being biased symmetrically with respect to the axis;
When the center of the free end 23 on the side opposite to the hinge hole 25 is bisected on the basis of the X axis of the side of the hinge hole 25, The side of the free end 23 constituting the blade 24 is formed of a round circumferential surface;
(22) is formed on the side of the free end (23) constituting the cutting blade (24) by reducing the weight by forming the space (21) by piercing the center side of the folding blade (20);
The cutting edge 24 of the folding blade 20 is formed with a chamfered portion 31 on the side of the hinge hole 25 so as to have a prism shape from the free end 23 side toward the hinge hole 25 side, 23) side edges constitute a plurality of cutting grooves (30) formed with beaks (32).
delete
delete
delete