WO2013032063A1

WO2013032063A1 - Grass cutter having a gear auxiliary device and a safety plate

Info

Publication number: WO2013032063A1
Application number: PCT/KR2011/008114
Authority: WO
Inventors: 남동우
Original assignee: 주식회사 현대그린텍
Priority date: 2011-08-26
Filing date: 2011-10-28
Publication date: 2013-03-07
Also published as: KR101078824B1

Abstract

The present invention relates to a grass cutter having a gear auxiliary device and a safety plate, which has been developed to reduce damage to a safety plate (formed to prevent damage from a blade for cutting grass colliding with objects on the ground) and to a support (for supporting the safety plate). The grass cutter has a gear auxiliary device and a safety plate that is fixed below a blade mounted on a rotating shaft that projects from and rotates at the bottom of a handle shaft of the grass cutter. After the rotating shaft of the grass cutter has the blade mounted thereon, a fixer coupling nut (having a screw thread formed on an inner peripheral surface thereof to correspond to a screw thread formed on the outer peripheral surface of the rotating shaft, and a screw thread formed on an outer peripheral surface thereof) is mounted on the rotating shaft, and then a second nut is coupled to fix the blade. The grass cutter further comprises: a rotator; and a fixer. The rotator has a screw thread formed on the upper inner peripheral surface thereof to couple with the outer peripheral surface of the fixer coupling nut, has an inner peripheral surface therebelow that is reduced in stages by means of first and second stepped portions, and has a ring-shaped fine guide groove formed in the undersurface thereof. The fixer has a guide rib covering a part of the bottom of the outer diameter surface of the rotator and a guide projection correspondingly inserted in the guide groove formed on a top surface of the fixer, has a third stepped portion formed thereon having an outer diameter that is reduced to fit closely against the bottom inner diameter of the rotator and having an inner diameter at a region corresponding to the second stepped portion that is reduced by a step, and has a fixer shaft projecting from the center of the bottom surface thereof and having a screw thread formed on the outer peripheral surface of the bottom. The gear auxiliary device further has a first bearing formed to be inserted and fixed in a region thereof at which the second and third stepped portions are formed. A fixing hole is formed in a region at the center of the safety plate at which the screw thread of the fixer is not formed, and the safety plate is fixed by a first nut corresponding to the screw thread of the fixer shaft.

Description

Mowers with hunger aids and safety plates

The present invention relates to a mower with a hunger aid and a safety plate, and more specifically, the safety plate formed to prevent damage caused by a blade cutting the grass collides with an object on the ground, and the support for supporting it is damaged. The present invention relates to a lawn mower having a safety plate developed to reduce damage occurring.

In the past, with the exception of golf courses and some lawn gardens, grass cutting tools depended on manual farming equipment such as sickles, but with the advent of mowers, many tasks are being made faster and easier.

Such mowers are exposed to the blades mounted on the lower part of the rotating shaft in the early stages, so that during the operation, the grass is damaged in a small way, colliding with the stones on the ground, the stones are popped out, or the blades are broken, causing serious injury to workers. There was a problem.

In order to prevent this, there have been attempts to fabricate materials such as synthetic resin strings, not metal blades, but the damage caused by the blades can be reduced, but the problem of injuring workers by colliding with objects on the ground such as stones is not improved at all. Did.

Recently, a technique has been proposed to prevent the rotating blade from colliding with the ground or an object on the ground by placing a separate safety plate under the blade so that the blade does not come in direct contact with the ground. It was improving.

Utility Model Registration No. 20-0238542-0000 (July 03, 2001) The cutting device of mowers is a representative structure, and the basic configuration is to mount the safety plate by further protruding the rotating shaft with the mower blade. However, the bearing was installed in the middle to prevent the safety plate from rotating and to keep one side of the safety plate connected to the handle bar and the support of the lawnmower.

However, in the above configuration, if the safety plate is inclined to the left and right while closely contacting the ground, serious fatigue accumulates in the bearing or the connection portion with the bearing, and eventually the bearing or the bearing connection portion breaks and suddenly rotates to the safety plate that should be stopped. This poses a significant threat to workers or those around them.

In addition, although there is a support for supporting the safety plate, the rotational force applied to the safety plate in the inoperative state of the bearing causes damage to the support plate, which rotates a wider range than the diameter of the safety plate, and as a result, the lower body of the operator may fall into the damage range. This was so high that damage to the bearings would inevitably lead to injuries.

In addition, the bearing breakage damages the safety plate, so when the bearing is damaged, the financial loss of replacing the entire safety plate was considerable.

Therefore, there is a need to improve the existing way of mounting safety plates and bearings with simple nuts and bolts when mounting safety plates.

The present invention was developed in order to solve the above problems, the object of the lawnmower having a hunger auxiliary device and a safety plate that can prevent the safety plate is damaged by the breakage of the bearing to prevent the direct connection between the safety plate and the bearing as possible Is in developing.

In addition, the present invention is to develop a mower equipped with a hunger assist device and a safety plate such that a pedestal fixing the safety plate prevents the rotation of the safety plate and is coupled to the center of the bottom of the safety plate.

In order to achieve the above object, the present invention is a mowing device having a safety plate and a hunger assist device including a safety plate fixed to the lower end of the blade mounted on a rotating shaft protruding to the lower end of the handle bar of the lawn mower;

After the blade is mounted on the rotary shaft of the lawn mower, a screw thread corresponding to the rotary shaft formed on the outer circumferential surface is formed and mounted on the inner circumferential surface, and a stator coupling nut is formed on the outer circumferential surface, and a second nut is coupled to fix the blade. To make it possible;

Threads are formed on the upper inner circumferential surface to correspond to the outer circumferential surface of the stator coupling nut and are coupled to each other. The lower circumference is gradually reduced by the first to second stepped portions of the inner circumferential surface. A rotor in which grooves are formed;

The upper surface is formed with a guide rib surrounding a portion of the lower end of the outer surface of the rotor and a guide protrusion inserted corresponding to the guide groove, the outer diameter is reduced to closely contact the inner diameter of the lower end of the rotor and then corresponds to the second stepped portion. A third stepped portion having an inner diameter shortened at a portion formed therein, and a stator having a fixed shaft having a screw thread formed on an outer circumferential surface of the bottom thereof, protruding upward from the bottom center;

A hunger aid further comprising a first bearing inserted into and fixed to a portion where the second to third stepped portions are formed;

A fixing hole is formed in the center of the safety plate to be inserted into a portion where no thread of the fixing shaft of the stator is formed, and is fixed by a first nut corresponding to the thread of the fixing shaft.

In addition, the fixing shaft of the stator is formed in a cylindrical shape with the bottom open, the upper end of the third stepped portion is formed in the upper surface has an open shape, the center is further formed through the vertical through-hole;

A nut-shaped bolt formed on the upper inner circumferential surface thereof so as to be threaded so as to correspond to the rotational shaft, the nut-shaped bolt being rotatably mounted with respect to the through hole by a head having an outer circumferential surface extending therethrough therethrough;

And a second bearing mounted between an outer diameter of the nut-shaped bolt and an inner diameter surface of the upper portion in which the third stepped portion is formed.

In addition, the safety plate has a shape in which the center of the upper surface on which the hunger assist device is mounted, the edge portion has a ring-shaped edge portion recessed further down, the edge portion has a pedestal seating portion to the rear;

One side is inserted into the fixed shaft of the stator, and then fixed by the first nut, and further extends through the pedestal seating portion is characterized in that it further comprises a pedestal is fixed to the other side to the handle bar.

In addition, the stator is configured such that only a through hole is formed without a fixed shaft;

The inner diameter of the through hole is formed at least equal to or larger than the outer diameter of the nut bolt so that the safety plate is fixed between the lower end of the stator and the head of the nut bolt when the screw hole of the nut bolt is engaged with the rotating shaft. Characterized in that configured.

As described above, the present invention has the effect of preventing safety accidents caused by preventing the safety plate from being immediately broken even if the bearing is damaged by mounting the safety plate by a separate gear support device, rather than being directly connected by the rotating shaft and the bearing. .

In addition, one side is fixed to the center of the bottom surface of the safety plate and the other side is fixed to the handle bar to increase the durability of the device so as to prevent the movement of the safety plate in the left and right directions to the maximum.

1 is a side cross-sectional view according to an embodiment of the present invention

2 is a partial cross-sectional view showing a hunger assistance device according to an embodiment of the present invention

Figure 3 is a bottom perspective view showing a safety plate according to an embodiment of the present invention

Figure 4 is a partial perspective view showing a pedestal according to an embodiment of the present invention

Figure 5 is a side cross-sectional view according to another embodiment of the present invention

Figure 6 is a partial cross-sectional view showing a hunger assist device according to another embodiment of the present invention

Figure 7 is a side cross-sectional view according to another embodiment of the present invention

Accordingly, the configuration of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce.

1 is a side cross-sectional view according to an embodiment of the present invention, Figure 2 is a partial cross-sectional view showing a hunger assist device according to an embodiment of the present invention, protrudes to the bottom of the handle bar 11 of the lawn mower (1) In the lawn mower having a hunger aid and safety plate comprising a safety plate (2) fixed to the lower portion of the blade (13) mounted to a rotating shaft (12) rotating;

After the blade 13 is mounted on the rotary shaft 12 of the lawn mower 1, a screw thread corresponding to the rotary shaft 12 having a thread formed on the outer circumferential surface thereof is formed and mounted on the inner circumferential surface, and a stator coupling nut 3 is also formed on the outer circumferential surface thereof. A second nut (14) is coupled to the blade (13) to fix the blade (13) after it is mounted;

Threads are formed on the upper inner circumferential surface to correspond to the outer circumferential surface of the stator coupling nut 3, and are gradually reduced by the first to second

stepped portions

411 and 412 whose inner circumferential surface is stepped down. And the bottom surface and the rotor 41 is formed with a guide groove 413 in a ring shape;

The upper surface is formed with a guide rib 421 surrounding a portion of the lower end of the outer surface of the rotor 41 and a guide protrusion 422 inserted corresponding to the guide groove 413, so as to closely contact the inner diameter of the lower end of the rotor. After the outer diameter is reduced, a third stepped portion 423 is formed in which the inner diameter is reduced stepwise at a portion corresponding to the second stepped portion 412, and a thread is formed on the outer circumferential surface of the bottom at the bottom of the bottom. A stator 42 in which a fixed shaft 424 is formed;

A hunger assist device (4) further comprising a first bearing (43) inserted into and fixed to a portion where the second to third stepped portions (412, 423) are formed;

In the center of the safety plate 2 is formed a fixing hole 21 is inserted into a portion of the stator 42 of the fixed shaft 424 is not formed, the first corresponding to the thread of the fixed shaft 424 1 shows a mower equipped with a hunger aid and a safety plate characterized by being fixed by a nut 22.

First, the bearing was mounted between the oral rotary shaft 12 and the safety plate 2 of the conventional lawn mower 1 and was simply connected by bolts or nuts to prevent the bearing from rotating the safety plate 2. When the safety plate (2) is in close contact with irregular ground due to the characteristics of 1), the safety plate (2) is often heard repeatedly from side to side, and when the bearing or its connection is broken by this result, the safety plate (2) threatens the worker. It is becoming.

The configuration of the present application for preventing this may be referred to as a hunger assist device (4) and the hunger assist device (4) is composed of a rotor 41, a stator (42) and the first bearing (43).

Meanwhile, the first bearing 43 is described and illustrated as being fixed by the second to third stepped

portions

412 and 423, but the position of the stepped portion for fixing the bearing 43 is changed to the upper and lower sides of the bearing in some cases. The fact that it can be said to be obvious to those skilled in the art.

The rotor 41 is mounted to the rotating shaft 12 to rotate, and the stator 42 has a structure that does not rotate by the first bearing 43.

In the case of the safety plate 2 is mounted on the fixed shaft 424 of the stator 42 is inserted into a portion where the thread is not formed is coupled in a state capable of idling.

This structure allows the safety plate 2 to rotate when the bearing is damaged, or the nut is momentarily loosened by the rotational force or the counter-rotational force caused by the work, so that the blade 12 or the safety plate 2 is strongly moved to another place. It can be said to have a double anti-rotation function to prevent it from popping out.

At this time, in the case of the hunger auxiliary device 4, the parts other than the first bearing 43 are made of a synthetic resin or a relatively hard metal, and the rotor 41 despite the noise of the engine when the first bearing 43 is broken. Or stator 42 is not only to generate a strong noise while breaking, it is preferable that the blade does not rotate so that the user can easily recognize.

In addition, since the breakage of the starvation aid 4 is not directly connected to the damage of the safety plate 2, the burden of the cost is reduced by replacing only the starvation aid 4.

In addition, there is an advantage that the work can proceed without having a means for fixing the safety plate (2) separate through the double anti-rotation structure.

In addition, by fastening the hunger assist device between the blade and the safety plate, the impact of the blade does not directly go to the safety plate during use, and the shock is transmitted to the hunger case, thereby absorbing the shock from the hunger case itself. There is this.

3 is a bottom perspective view showing a safety plate according to an embodiment of the present invention, Figure 4 is a partial perspective view showing a pedestal according to an embodiment of the present invention, the safety plate 2 is the hunger assist device (4) The center of the upper surface to be mounted has a recessed shape, the edge portion of which has a ring-shaped edge portion 23 recessed further downward, and the edge portion 23 has a pedestal seating portion 24 which is opened rearwardly;

One side is inserted into the fixing shaft 424 of the stator 42 and then fixed by the first nut 22, extended to pass through the pedestal seating portion 24, the other side is fixed to the handle bar (11) An embodiment is further provided with a pedestal 5.

The embodiment is an embodiment having a means for fixing the safety plate 2, the first when the shaving of the safety plate 2 is fixed to the top of one side of the conventional safety plate 2 and the handle bar 11 One side is coupled to the stator (2) irrelevant to the safety plate (2), but a part is inserted into the pedestal seating portion 24 to prevent rotation, even if the safety plate (2) is damaged the pedestal (5) Is to maintain a firm coupling state and to act as a safety device to prevent the rotation of the safety plate (2).

In addition, the pedestal 5 has a mounting hole 51 inserted into the fixed shaft 424 and a protective rod inserting portion 52 inserted into the pedestal seating portion 24, the handle bar 11 in the inserted state If you loosen the connection and rotate the) can act as a spanner to rotate the safety plate (2) it is possible to replace the tool as needed.

5 is a side cross-sectional view according to another embodiment of the present invention, Figure 6 is a partial cross-sectional view showing a hunger assist device according to another embodiment of the present invention, the fixed shaft 424 of the stator 42 is the bottom surface is open The upper portion is formed in a cylindrical shape and the third stepped portion (423) is formed in the upper surface has an open shape, the center is further formed through the vertical through hole 425;

The through hole 425 is formed on the upper inner circumferential surface by a head 442 through which the outer circumferential surface is extended after the through hole 425 is formed with a screw hole 441 in which a thread is formed so as to correspond to the rotation shaft 12. Nut-shaped bolt (44) rotatably mounted relative to;

An embodiment including a second bearing 45 mounted between an outer diameter of the nut-shaped bolt 44 and an inner diameter surface of an upper portion where the third stepped portion 423 is formed is presented.

In the above embodiment, in order to maintain the more securely coupled state of the rotor 41 and the stator 42, the nut-shaped bolts 44 restricting the position of the stator 42 are placed to double-couple.

7 is a side cross-sectional view according to another embodiment of the present invention, wherein the stator 42 is configured such that only a through hole 425 is formed without a fixed shaft 424 formed therein;

The inner diameter of the through hole 425 is at least equal to or larger than the outer diameter of the nut-shaped bolt 44 so that the stator when the screw hole 441 of the nut-shaped bolt 44 engages with the rotation shaft 12. It has been shown that the safety plate 2 is configured to be fixed between the lower end of 42 and the head 442 of the nut-shaped bolt 44.

In the above embodiment, the safety plate 2 and / or the pedestal 5 can be fixed only by coupling the nut-shaped bolt 44 without forming a separate fixed shaft 424 and without having the first nut 22. The structure is simplified so that the safety plate 2 is rotatable in the state coupled with the nut-type bolt (44).

Claims

To the lawn mower including a safety plate and a safety plate including a safety plate 2 fixed to a lower portion of the blade 13 mounted on a rotating shaft 12 that protrudes at the lower end of the handle bar 11 of the lawn mower 1 and rotates. In;

After the blade 13 is mounted on the rotary shaft 12 of the lawn mower 1, a screw thread corresponding to the rotary shaft 12 having a thread formed on the outer circumferential surface thereof is formed and mounted on the inner circumferential surface, and a stator coupling nut 3 is also formed on the outer circumferential surface thereof. A second nut (14) is coupled to the blade (13) to fix the blade (13) after it is mounted;

Threads are formed on the upper inner circumferential surface to correspond to the outer circumferential surface of the stator coupling nut 3, and are gradually reduced by the first to second stepped portions 411 and 412 whose inner circumferential surface is stepped down. And the bottom surface and the rotor 41 is formed with a guide groove 413 in a ring shape;

The upper surface is formed with a guide rib 421 surrounding a portion of the lower end of the outer surface of the rotor 41 and a guide protrusion 422 inserted corresponding to the guide groove 413, so as to closely contact the inner diameter of the lower end of the rotor. After the outer diameter is reduced, a third stepped portion 423 is formed in which the inner diameter is reduced stepwise at a portion corresponding to the second stepped portion 412, and a thread is formed on the outer circumferential surface of the bottom at the bottom of the bottom. A stator 42 in which a fixed shaft 424 is formed;

A hunger assist device (4) further comprising a first bearing (43) inserted into and fixed to a portion where the second to third stepped portions (412, 423) are formed;

In the center of the safety plate 2 is formed a fixing hole 21 is inserted into a portion of the stator 42 of the fixed shaft 424 is not formed, the first corresponding to the thread of the fixed shaft 424 1 Mowers with hunger aid and safety plate, characterized in that fixed by the nut (22).
According to claim 1, wherein the fixing shaft 424 of the stator 42 is formed in a cylindrical shape with the bottom open, the upper end of the third stepped portion 423 has a shape in which the upper surface is open, but vertically in the center A through hole 425 is further formed;

The through hole 425 is formed on the upper inner circumferential surface by a head 442 through which the outer circumferential surface is extended after the through hole 425 is formed with a screw hole 441 in which a thread is formed so as to correspond to the rotation shaft 12. Nut-shaped bolt (44) rotatably mounted relative to;

A mower with an hunger assistance device and safety plate, characterized in that it comprises a second bearing (45) mounted between the outer diameter of the nut-shaped bolt (44) and the inner diameter surface of the upper portion formed with the third stepped portion (423).
According to claim 1 or 2, The safety plate (2) has a shape in which the center of the upper surface on which the hunger auxiliary device (4) is recessed, the edge portion of the ring-shaped edge portion further recessed down ( 23, wherein the rim 23 has a rear seat rest 24;

One side is inserted into the fixing shaft 424 of the stator 42 and then fixed by the first nut 22, extended to pass through the pedestal seating portion 24, the other side is fixed to the handle bar (11) Mowers with hunger aid and safety plate, characterized in that it further comprises a pedestal (5).
3. The stator (42) is configured such that only a through hole (425) is formed in the stator (42) without a fixed shaft (424);

The inner diameter of the through hole 425 is at least equal to or larger than the outer diameter of the nut-shaped bolt 44 so that the stator when the screw hole 441 of the nut-shaped bolt 44 engages with the rotation shaft 12. Mowers with hunger aids and safety plates, characterized in that the safety plate (2) is configured to be fixed between the lower end of the (42) and the head (442) of the nut-shaped bolt (44).