WO2018004282A1

WO2018004282A1 - Grass trimmer cutting blade unit

Info

Publication number: WO2018004282A1
Application number: PCT/KR2017/006920
Authority: WO
Inventors: 전문배
Original assignee: 전문배
Priority date: 2016-06-29
Filing date: 2017-06-29
Publication date: 2018-01-04
Also published as: KR101695386B1

Abstract

A grass trimmer cutting blade unit of the present invention comprises: a housing including a first housing member, a second housing member, and a retracting and drawing part through which respective ends of the first and the second housing member are spaced at a predetermined distance; an eccentric support part which is rotatably supported in a circumferential direction by a hinge pin in such a way as to be drawn to the retracting and drawing part, arranged at a predetermined distance from a center of the housing, and coupled to the hinge pin, and has an eccentric outer circumferential surface; cutting blades, each having a cutting part for cutting grass and extending from the eccentric support part; and an elastic support unit which is installed in the housing and is in contact with the eccentric support part of each of the cutting blades in such a way as to allow each of the cutting blades to be elastically biased in a direction in which the cutting blades may be simultaneously drawn from the retracting and drawing part.

Description

Mower Cutting Blade Unit

The present invention relates to a lawn mower, and more particularly, to a cutting blade unit for mowers with an improved support structure for elastically supporting a blade for cutting grass.

Generally, mowers are used to remove rice fields, field heads, tombs, and weeds and grasses growing around them.

Conventional blade is formed in the form of a strip that is formed through holes that can be fitted to the drive shaft, it is common that one side edge that collides with the grass is sharply formed.

When the blade of the conventional metal material collides with the gravel or the structure of the ground, the gravel is often caused to cause injury or injury to workers or neighbors or the blade is broken.

Republic of Korea Patent Publication No. 10-1030251 discloses a mowing machine. The lawn mower is a rotary disk formed in a lozenge so as to absorb the impact by supporting the knife when the lawnmower knife is subjected to a strong impact during the first trimming, and the upper blade is installed on the rotating disk to smoothly cut smooth grass or grass and And a lower blade formed 10-40% longer than the upper blade to remove tree branches.

Korean Utility Model Registration No. 20-0393125 discloses a blade for mowing. The blade for the lawn mower is installed in a plurality of blades radially on the bottom surface of the disc portion formed in the center of the fastening hole coupled to the rotary shaft is fixed by rivets so that one end of the blade can be unfolded by centrifugal force.

Republic of Korea Patent Publication No. 10-1317832 discloses a mowing blade. And the Republic of Korea Patent Publication No. 10-1469821 is a lawnmower that can be easily used for replacement. The lawn mower blade is mounted to the end of the worktable is rotatably installed on the rotating body is provided with a cutting blade protruding the end of the rotating body by the centrifugal force during the rotation of the rotating body.

As described above, in the case of a blade for a mower that is rotatably installed in the main body and protrudes by the centrifugal force of the main body, the blade is folded inside the main body when the blade rotates at a low speed or when the blade collides with a large plant. There is a disadvantage that the work is not smooth. In addition, it is possible to increase the weight of the blade or increase the rotational speed of the main body to increase the cutting force on the plant.In this case, the cutting force is improved, but when a hard foreign object collides with the blade, the blade is broken or a foreign object or fragment of the blade is splashed out. An accident may occur.

In addition, Japanese Utility Model Publication No. 06-038435 discloses a spring mowing blade. Spring-type mowing blade has a structure that can promote safety by cushioning by elastic force in contact with uncut grass. However, such a structure has a problem that the structural strength is relatively weak and easily damaged.

In Japanese Unexamined Patent Publication No. 09-298925, a towing body is posted. It is formed of one metal wire, and a structure is provided with a ring portion at its end. This structure requires a means for preventing a separate rotation when fixing the ring portion.

In the Republic of Korea Patent Registration No. 1317832 mowing blade is posted. Published lawnmower blades have a configuration that allows a separate cutting blade to be coupled to the rotating body with a pin to exit and drive with centrifugal force. However, the blade structure has a limit to increase the weeding power by the blade in the process of cutting grass.

And the Republic of Korea Patent Registration No. 10-1583805 has a cover structure for the lawn mower having a impact pant function for the lawn mower having an impact protection function is posted. The conventional lawn mower disclosed is a housing rotatably connected to a rotating shaft; A plurality of cutter blades coupled at regular intervals along the outer circumferential direction of the housing; Including, but the cutter blade, as a coil spring blade having a cylindrical cross-section, when the impact of the cutter blade is applied during the mowing operation, has a structure that is introduced into the housing.

Such a structure cannot increase the design freedom of the cutting blade because each cutter blade must have elastic force.

The present invention is to solve the technical problem as described above, it is possible to provide a uniform elastic force to the plurality of cutter blades, mowing mowing cutting unit that can prevent the cutting force is lowered in contact with the pool during operation In providing.

The mowing machine cutting blade unit of the present invention for solving the technical problem according to the present invention has a first housing member, and a second housing member coupled to the first housing member and coupled to the ends of the first and second housing members. A housing having a lead-out portion spaced at a predetermined interval,

It is rotatably supported by a hinge pin in the circumferential direction so as to be spaced apart from the center of the housing to be drawn out to the lead-out portion, an eccentric support portion coupled with the hinge pin and having an eccentric outer circumferential surface, extending from the eccentric support portion, and pulled out. Cutting blades having a cutting section for cutting the

And an elastic support unit installed in the housing and contacting the eccentric support portions of the respective cutting blades to elastically bias in the direction in which the respective cutting portions are simultaneously drawn out from the drawing-out portion.

In the present invention, the elastic support unit includes brackets installed in the lower housing and a ring-shaped elastic member supported by the brackets and in close contact with the eccentric support of each cutting blade. The elastic member has a predetermined thickness and is formed by bending a strip-shaped bar into a ring shape.

The eccentric support of the cutting blade is positioned between and fixed between the first member on the disc formed with a first edge portion coupled to the hinge axis, the second member on the disc formed with a second edge portion, and the first and second members. The cutting part is provided, and is formed through the first and second members and the cutting part, and a pin coupling hole is formed to be eccentrically coupled to the end of the first and second members corresponding to the cutting part and coupled with the hinge pin.

The mowing machine cutting blade unit according to the present invention can elastically bias a plurality of cutting blades installed in the circumferential direction to the outside at the same time, and the elastic bearing force acts as a reaction force against the external force applied to the cutting part when the pull is cut. Can improve. In addition, when the weeding operation hits a tree that is difficult to cut relative to a stone or the like, the cutting portion of the cutting blade overcomes the elastic force, it is possible to prevent the cutting blade is damaged by being rotated and inserted into the lead-out portion.

1 is a perspective view of a mower cutting blade unit according to the present invention,

2 is an exploded perspective view of the lawn mower cutting blade unit according to the present invention;

3 is a cross-sectional view of the lawn mower cutting blade unit according to the present invention,

Figure 4 is an exploded perspective view showing the cutting blade,

5 is a partially cutaway perspective view showing another embodiment of a cutting blade,

6 is a view showing another embodiment of the cutter unit,

7 is a plan view showing another embodiment of the lawn mower cutting blade unit according to the present invention,

8 is a perspective view showing an extract of a state in which the cutting blade shown in Figure 7 is supported and operated by the elastic support unit.

9 to 13 is a plan view showing an embodiment of the elastic support unit for providing an elastic force to the cutting blade of the lawn mower cutting blade unit according to the present invention and the operating state of the cutting blade thereby.

The cutting blade unit according to the present invention is installed on the rotating shaft of the wire connected to the drive unit of the lawn mower, one embodiment thereof is shown in FIGS. 1 and 3.

Referring to the drawings, the cutting blade unit 10 of the lawn mower according to the present invention includes a housing 20 having a lead-out portion 23 formed along an outer circumferential surface thereof, and a hinge shaft circumferentially from the center of the housing 20. Cutting blades 30 rotatably installed by the elastic support unit 40 is installed in the housing 20 to elastically bias the cutting blades 30 to protrude from the housing 20 at the same time. Include.

Referring to the mowing device cutting blade unit according to the present invention configured as described above in more detail by component as follows.

In the housing 20 of the lawn mower cutting blade unit 10, the first housing member 21 and the second housing member 22 are coupled to each other to form a lead-out portion 23 along an outer circumferential surface thereof. The housing member 21 has a curved portion 22a whose center portion is curved upward from the lower surface side. The curved portion 22a has a structure with a flat top surface. And the center portion of the curved portion 22a is provided with a shaft coupling portion 24 is coupled to the rotating shaft so that the power transmitted from the drive unit is transmitted. In addition, the first and

second housing members

21 and 22 are provided with housing coupling portions 25 for coupling them. The housing coupling part 25 includes

coupling holes

25a and 25b formed on opposite surfaces of the first housing member 21 and the second housing member 22 and

coupling holes

25a and 25b thereof. And a hinge coupling pin 26 to couple the first and

second housing members

21 and 22 to the lead-out portion 23 on the outer circumferential surface thereof.

As shown in FIG. 3, the hinge coupling pin 26 includes a first coupling member 26a inserted into a coupling hole from a lower surface of the first housing member 21 and a coupling hole formed therefrom from an upper surface of the second housing member. And a set screw 26b coupled to the first coupling member 26a through 25b.

And the cutting blade 30 is the hinge coupling pins 26 are coupled to each withdrawal from the pull-out drawer 23 to cut the grass by the rotation of the housing 20, shown in Figures 1 to 4 As described above, the eccentric support part 31 is eccentrically coupled to the hinge coupling pin 26 and the cutting part 37 extends from the eccentric support part 31 to cut the grass.

The eccentric support part 31 has a disc shaped first member 33 having a first edge portion 32 coupled to a hinge axis, and a disc shaped second member 35 having a second edge portion 34 formed thereon. The first and

second members

33 and 35 are welded with the base of the cutting part 37 interposed therebetween. Part of the first member 33 and the second member 35 is preferably cut to prevent the first and

second members

33 and 35 from encroaching on the frying cut portion 27. The first and

second edge portions

32 and 34 formed at the edges of the first and

second members

33 and 35 may be bent in opposite directions and have the same radius of curvature.

In addition, the first and

second members

33 and 35 are eccentrically formed toward the rear end side corresponding to the cutting portion 37 to form a pin coupling hole 36 coupled to the hinge coupling pin 26. The pin coupling hole 36 is eccentrically formed toward the rear end side of the cutting blade 30 so that the cutting portion 37 protrudes from the lead-out portion 23 when the elastic force is provided by the elastic support unit. (See Figures 3 and 4)

On the other hand, the cutting blade 30 is not limited to the above-described embodiment, as shown in Figure 5 may be formed by coupling one first member 33 to at least one side of the cutting portion 37. . When the cutting blade 30 has a relatively thick thickness of the cutting portion 37, the first and

second members

33 and 35 may not be attached thereto, as shown in FIG. 6. It may be made in a shape.

As shown in FIGS. 7 and 8, the cutting blade 50 includes a hinge coupling part 51 rotatably coupled to the hinge axis 26 and an extension extending in the rotation direction from the hinge coupling part 51. A portion 52 and a cutting blade forming portion 53 protruding from the end of the extension portion 52 to the lead-out portion 23 is provided. In addition, the cutting blade forming portion 53 is formed by the external force applied to the cutting blade forming portion 53 by contacting the elastic member 42 of the elastic support unit 40 and formed on the extension portion 52. 23 is provided with a support protrusion 54 for elastically biasing the cutting blade 50 in the outward direction. The support protrusion 54 may be formed in plurality.

The elastic support unit 40 provides elastic force in the direction in which the respective cutting blades 30 protrude from the lead-out portion 23 of the housing 20 at the same time, FIGS. 3, 7, 9 and 9. As illustrated in FIGS. 10 and 11, a plurality of brackets 41 (which may be formed in the housing as illustrated in FIG. 7) supported on the outer circumferential surface of the curved portion 21a of the first lower buzzing member may be hinge hinge pins 26. ) Extends toward the side, and ends of the brackets 41 are provided with ring-shaped elastic members 42 in close contact with the eccentric support portions 31 of the respective cutting blades 30. The elastic member 42 has a predetermined thickness and is formed by bending a strip-shaped bar into a ring shape. The width of the elastic member 42 is preferably formed to have a width substantially the same as the width of the first or

second edge portion

32, 34 of the eccentric support portion 31 or the cutting blade. The elastic member 42 is composed of a single body or a divided body in a ring shape.

However, the elastic support unit is not limited to this, and as shown in FIGS. 12 and 13, dovetail-shaped fixing parts 46 are formed at predetermined angular intervals on the strip-shaped elastic member 45 formed in a band. The support bracket 48 having the coupling fixing portion 47 coupled to the fixing portion 46 may be fixed to the housing to support the elastic member 45.

As described above, the cutting blade unit of the lawn mower according to the present invention configured as described above is not shown in the drawing, but the drive shaft rotated by the driving unit and the shaft coupling unit 24 are combined to rotate the pull-out unit 23. Weeds are cut by the cutting parts 37 of the

cutting blades

30 and 50 protruding to each other.

At this time, a relatively large impact in the rotational direction to the cutting blade 30, that is, the impact of the rotational force in the rotational direction in the event of a collision with a stone or a relatively thick wood. Accordingly, the

cutting blades

30 and 50 overcome the elastic force of the

elastic member

42 or 45 which is in contact with the eccentric support portion 31 or the support protrusion 54 to provide the elastic force, and is rotated and the lead-out portion 23 is rotated. Is inserted). When the rotational force due to the collision is removed, the elastic member 42 presses the eccentric support 31 or the support protrusion 54 so that the

cutting blades

30 and 50 protrude from the lead-out lead 23. do.

In particular, since the cutting portion 37 of the lawn mower cutting blade unit 30 is provided with an elastic force to the elastic member 42 in a state of protruding from the pull-out portion 23, the shear force of the pool during the cutting operation of the pool by rotation It can increase. In particular, when the fixing portion 46 of the dovetail shape in the circumferential direction is formed in the elastic member 45, as shown in Figure 12 and 13, the elastic force of the elastic member can be relatively strong to improve the restoring force, The fixing of the elastic member 45 can be easily fixed by the support bracket 48 having a dovetail coupling fixing portion 47 coupled to the fixing portion 46.

Each cutting blade installed in the housing is provided with an elastic force by one elastic member, so the structure is relatively simple.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims

A housing having a first housing member and a second housing member coupled to the first housing member, the housing having a lead-out portion at which end portions of the first and second housing members are spaced by a predetermined distance;

It is rotatably supported by a hinge pin in the circumferential direction so as to be spaced apart from the center of the housing to be drawn in and drawn out by the draw-out part, which is coupled to the hinge pin and has an eccentric outer circumferential surface, and from the knitting support part. Cutting blades having a cutting portion for extending and cutting grass,

And a resilient support unit installed in the housing and contacting the eccentric support parts of the respective cutting blades to elastically bias in the direction in which the respective cutting parts are simultaneously withdrawn from the drawing-out and discharging part.
The method of claim 1,

The elastic support unit includes brackets installed in the lower housing and a ring-shaped elastic member supported by the brackets and in close contact with the eccentric support of each cutting blade, wherein the elastic member has a predetermined thickness and has a strip shape. A mower cutting blade unit, characterized in that the bar is formed in a ring shape.
The method of claim 1,

The eccentric support of the cutting blade is positioned between and fixed between the first member on the disc formed with a first edge portion coupled to the hinge axis, the second member on the disc formed with a second edge portion, and the first and second members. The cutting part is provided, and is formed through the first and second members and the cutting part, characterized in that the pin coupling hole is eccentrically coupled to the end of the first and second members corresponding to the cutting part is coupled to the hinge pin. Mower cutting blade unit.
The method of claim 1,

The elastic support unit has a dovetail-shaped fixing parts formed at predetermined angular intervals on a strip-like elastic member formed in a circular band, and a support bracket having a coupling fixing portion coupled to the fixing parts is fixed to the housing. A mower cutting blade unit, characterized in that the elastic member is made of a structure supported.
A housing having a first housing member and a second housing member coupled to the first housing member, the housing having a lead-out portion at which end portions of the first and second housing members are spaced by a predetermined distance;

A hinge coupling part rotatably supported by a hinge pin in a circumferential direction so as to be spaced apart from a center of the housing to be pulled in and out of an inlet outlet, a hinge coupling part rotatably coupled to a hinge axis, and a rotation direction from the hinge coupling part; Cutting edges having an extended portion of the cutting edge, a cutting blade forming portion protruding from the end of the extension portion to the lead-out portion, and supporting protrusions formed on the extension portion;

And a resilient support unit installed in the housing and contacting the support protrusion of each cutting blade to elastically bias the cutting blade forming portion to be drawn out from the pull-out portion.