KR102106985B1 - Grass Mower Cutter Structure - Google Patents

Abstract

The present invention relates to a cutter structure for a grass mower combined with a rotary shaft of a grass mower to be rotated. The cutter structure includes: a lower housing (110) having a center part combined with a rotary shaft of a grass mower to be rotated; a plurality of support pins (210) spaced from the center part of the lower housing (110) by a preset distance to be installed on the circumference along the interior space of the lower housing (110); a spring fastening bracket (220) which is a member having an L-shaped cross section, having one side of a horizontal part inserted into the lower part of each of the support pins (210) to be fixed, and including a first cut groove (221) formed in the center of the upper part of a vertical part; a torsion spring (230) combined to be inserted into each of the support pins (210) to be located in the upper part of the spring fastening bracket (220), and having one end stored in the first cut groove (221) of the spring fastening bracket (220); a cutter (240) which is a member having a vertically inverted L-shaped cross section, having one side of a horizontal part, which is close to a vertical part, combined to be inserted into each of the support pins (210), having the other side of the horizontal part functioning as a cutting blade and protruding to the outside of the lower housing (110), and including a second cut groove (242) provided in the center of the lower part of the vertical part to store the other end of the torsion spring (230); and an upper cover (310) combined with the upper part of the lower housing (110) to be rotated together with the lower housing (110). The cutter structure is capable of providing user convenience while reducing maintenance costs.

Description

Grass mower cutter structure

The present invention relates to a cutter structure of a mower, the object of which is to provide a cutter structure of a new concept that can be easily replaced with a damaged cutter while simultaneously fabricating the entire metal, simplifying the structure and improving durability.

In general, a mower is used to remove weeds or grass in the open air. Conventional blades are made in the form of a strip with a through hole that can be fitted to a drive shaft, and one edge in contact with the grass is sharply formed. It was common.

The blade of the conventional metal material has a problem in that a gravel bounces and injuries to an operator or a nearby person or the blade is damaged when colliding with a gravel or a structure on the ground, and the following techniques have been proposed to solve this problem.

(1) In the case of a mower weeding device, such as Patent Publication No. 10-1030251, a rotary disk formed in a rhombic shape and soft so as to absorb the shock by supporting the knife, etc., when the mower's knife receives a strong impact during mowing and is bent back. It consists of an upper blade for mowing grass and / or grass evenly and a lower blade formed 10-40% longer than the upper blade to remove branches and / or tree roots that are more laborious than mowing grass and / or lawn. The lawnmower knife is rotatably connected to the rotary disk, and the lawnmower knife is rotatably connected to the first rotary shaft and the lawnmower knife, which becomes a rotational center when the lawnmower knife encounters an obstacle strong enough to be pushed back to the bracket. A second axis of rotation, which is the center of rotation, is formed when the mower meets the obstacle and is pushed back. Positioned between the knife disk and the lawn mower comprises a bracket that connects the rotating disk and the lawn mower knife.

(2) Registered Utility Model Publication No. 20-0393125 discloses a blade for mowers, where a plurality of blades are radially installed on the bottom surface of a disk portion in which a fastening hole coupled to a rotating shaft is formed at the center, but one end of the blade is spread by centrifugal force. It is characterized by being fixed with rivets to enable.

(3) Registered Patent Publication No. 10-1317832 is provided to be rotatably installed on a rotating body in which the mower blade rotates and is provided with a cutting blade whose end protrudes to the outside of the rotating body when the rotating body rotates. However, if the rotating body is rotated at a low speed or the blade collides with a large plant, the blade is easily folded into the main body, so there is a disadvantage that the mowing work is not smoothly performed. It is possible to increase the weight or increase the rotational speed of the main body. In this case, although the cutting force is improved, when a hard foreign object collides with the blade, the blade is broken or a foreign object or a fragment of the blade bounces, causing a safety accident.

(4) Republic of Korea Patent Registration No. 10-1583805 is connected to the rotating shaft and a rotatable housing; A plurality of cutter blades coupled at regular intervals along the outer circumferential direction of the housing; Although included, the cutter blade is a coil spring blade having a cylindrical cross-section, and when the impact of the cutter blade is applied during the mowing operation, a structure that is introduced into the interior of the housing is presented. There is a drawback that the design freedom of the cutting blade cannot be increased because the blade must have elasticity.

[Advanced technical literature]

Registered Patent No. 10-1583805

Registered Patent No. 10-1317832

Registered Patent No. 10-1030251

Registration room No. 20-0393125

The object of the present invention created to solve the above problems is as follows.

First, it is an object of the present invention to provide a cutter structure of a new concept that prevents safety accidents due to this and does not degrade the cutting efficiency even if an impact occurs on the cutter during the cutting operation.

Second, another object of the present invention is to provide a cutter structure of a new concept that can be easily replaced only the damaged cutter.

Third, another object of the present invention is to provide a cutter structure of a new concept that can increase the durability and lower the production cost by manufacturing the entire structure with a metal material.

The technical configuration of the present invention created to achieve the above object is as follows.

The present invention relates to a cutter structure for a lawn mower that is coupled to and rotates on a rotating shaft of a mower, the lower housing 110 having a central portion coupled to and rotating with a rotating shaft of the mower; A plurality of support pins 210 spaced a predetermined distance from the center of the lower housing 110 and installed on the circumference along the inner space of the lower housing 110; As a member having a 'b' cross-section, one side of the horizontal portion is fixed by being inserted into the lower portion of each of the support pins 210, and a spring-bonding bracket in which a first incision groove 221 is formed at the center of the upper portion of the vertical portion ( 220); Torsion springs 230 which are coupled to be inserted into each of the support pins 210 and are located above the spring binding bracket 220, and one end is accommodated in the first cutting groove 221 of the spring binding bracket 220. ); As a member having a 'a' cross-section, one side of the horizontal portion close to the vertical portion is coupled to be inserted into each of the support pins 210, and the other side of the horizontal portion serving as a cutting edge is the lower housing 110. A cutter 240 that protrudes outward and is provided with a second incision groove 242 in the center of the lower end of the vertical portion to receive the other end of the torsion spring 230; And an upper cover 310 coupled to the upper portion of the lower housing 110 and rotating together with the lower housing 110.

Technical effects according to the configuration of the present invention are as follows.

First, even if an impact occurs on the cutter during the mowing process, it prevents safety accidents caused by this and at the same time, it provides a new concept of the cutter structure that does not lower the mowing efficiency, so that the work can be performed effectively and safely.

Second, only damaged cutters can be easily replaced to reduce maintenance costs and provide convenience.

Third, it is possible to increase the durability and lower the production cost by manufacturing the entire structure with a metal material.

1 is an exploded perspective view showing the overall configuration of the present invention.
2 is a partially enlarged view showing a coupling structure of the cutter 240.
3 is a partially enlarged view of another embodiment of the cutter 240 coupling structure.
4 shows a shape in which the upper cover 310 and the lower housing 110 are combined, and the cutter 240 protrudes outward.
5 shows a case in which the lower cover 410 is added to the outer lower surface of the lower housing 110 as another specific embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

The present invention relates to a cutter structure for a mower that is coupled to and rotates on a rotating shaft of a mower, as shown in FIG. 1, a lower housing 110, a support pin 210, a spring fastening bracket 220, a torsion spring 230, It includes a cutter 240 and the upper cover 310.

The lower housing 110 is a disk-shaped structure provided with an internal space in which the cutter 240 is mounted, and the central portion of the lower housing 110 is rotated by being coupled to the rotating shaft of the mower.

The support pin 210 is spaced a predetermined distance as shown in Figure 1 or Figure 2 is installed on the circumference along the inner space of the lower housing 110. That is, the support pin 210 is fixed to the lower housing 110 by a press-fit method or is fixed to the lower housing 110 by a separate hardware such as a bolt and rotates together with the lower housing 110 do.

Spring fastening bracket 220 is a member having a 'b' cross-section, one side of the horizontal portion is fixed by being inserted into each lower portion of the support pin 210, the first incision groove 221 in the center of the upper portion of the vertical portion It is formed.

The torsion spring 230 is coupled to be inserted into each of the support pins 210 and is located above the horizontal portion of the spring binding bracket 220. One end of the torsion spring 230 is a first incision of the spring binding bracket 220. It is accommodated in the groove 221.

The cutter 240 is a member having a 'a' cross-section, and one side of the horizontal portion close to the vertical portion is coupled to be inserted into each of the support pins 210, and the other side of the horizontal portion serving as a cutting blade is shown in FIG. 4. As illustrated, the lower housing 110 and the upper cover 310 protrude to the outside of the lower housing 110 in a combined state to serve as a cutting blade.

A second incision groove 242 is provided at the center of the lower end of the vertical portion of the cutter 240 to accommodate the other end of the torsion spring 230. The second incision groove 242 may extend along the vertical portion of the cutter 240 to extend to one end of the horizontal portion of the cutter 240.

The upper cover 310 is coupled to the upper portion of the lower housing 110 and rotates together with the lower housing 110, the lower end of the support pin 210 is coupled to the lower housing 110 and the upper end of the support pin 210 It becomes a structure coupled to the upper cover 310 to maintain a stable coupling state of the support pin 210.

The upper end of the support pin 210 may be defective in a slip-fit manner to the upper cover 310, and as shown in FIG. 1, penetrates the upper cover 310 to penetrate the upper end of the support pin 210 It is also possible to use a fastening bolt 250 fastened to.

Therefore, the upper cover 310 can be easily removed, and when the upper cover 310 is removed, the cutter 240 can be conveniently removed from the support pin 210 without a separate tool and replaced.

The clearance adjustment washer 260 is fitted between the lower surface of the upper cover 310 and the upper surface of the horizontal portion of the cutter 240, as shown in FIG. 1, and the fastening bolt 250 is When fastened, the function of adjusting the clearance between the upper cover 310 and the lower housing 110 is performed.

That is, the gap between the upper cover 310 and the lower housing 110 can be freely adjusted by differently applying the thickness or quantity of the gap adjustment washer 260 as necessary.

If the external force does not work in the state coupled to the support pin 210, the cutter 240 protrudes outwardly from the lower housing 110 and the upper cover 310 by the torsion spring 230 and maintains the unfolded state. When an external force greater than the size acts on the cutter 240, the shock is alleviated through the process of temporarily retracting while rotating in the state inserted into the support pin 210, and then returned to the original position by the action of the torsion spring 230 .

The lower housing 110, the support pin 210, the spring mounting bracket 220, the torsion spring 230, the cutter 240, and the upper cover 310 are made of a metal material, the lower housing 110 and the upper The rim of the cover 310 is preferably a structure in which a hemming process is performed to reinforce the strength of the rim.

In addition, the lower housing 110 and the upper cover 310 are preferably formed of a pantone that is repeatedly bent so as to form an appropriate step along the surface, and it is preferable to increase the structural strength of the entire body, and such a stepped portion merely serves to reinforce the structure. 3, as shown in FIG. 3, the stepped portion is bent and protrudes upward to form the bracket engaging jaw 115, and the lower end of one side of the spring engaging bracket 220 is in contact with the bracket engaging jaw 115, so that the spring engaging bracket 220 It may be a structure that prevents rotation.

5 is another specific embodiment of the present invention, showing the case where the lower cover 410 is bolted to the outer lower surface of the lower housing 110, when the lower cover 410 is added as such, the lower cover ( When the 410) is in contact with the ground, the cutter 240 can be automatically separated from the ground by a certain distance, so there is no need to keep the mower when mowing, and the lower cover 410 of the mower is in contact with the ground. Just move.

The lower cover 410 is a container-shaped member having an empty interior and a constant height. When a plurality of different heights are provided, the separation height of the cutter 240 can be changed, and the lower surface of the lower cover 410 In the case of manufacturing a spherical shape, the mowing can be performed while moving the mower more conveniently by reducing the resistance during movement.

As described above, specific embodiments of the present invention have been described with reference to the accompanying drawings, but the protection scope of the present invention is not necessarily limited to these embodiments, and various design changes and announcements are made within the scope of not changing the technical gist of the present invention. In the case of addition or deletion of technology, simple numerical limitation, etc., it is apparent that it falls within the protection scope of the present invention.

110: lower housing
115: bracket hanging jaw
210: support pin
220: Spring binding bracket
221: first incision groove
230: Torsion spring
240: Cutter
242: second incision groove
250: Fastening bolt
260: clearance adjustment washer
310: upper cover
410: lower cover

Claims (7)

It relates to a cutter structure for a lawn mower coupled to the rotary shaft of the mower,
The lower housing 110 is rotated is coupled to the center of the rotary shaft of the mower;
A plurality of support pins 210 spaced a predetermined distance from the center of the lower housing 110 and installed on the circumference along the inner space of the lower housing 110;
As a member having a 'b' cross-section, one side of the horizontal portion is fixed by being inserted into the lower portion of each of the support pins 210, and a first cutting groove 221 is formed in the center of the upper end of the vertical portion ( 220);
Torsion springs 230 coupled to be inserted into each of the support pins 210 are located above the spring-bonding bracket 220, and one end is accommodated in the first cutting groove 221 of the spring-bonding bracket 220. );
As a member having a 'a' cross-section, one side of the horizontal portion close to the vertical portion is coupled to be inserted into each of the support pins 210, and the other side of the horizontal portion serving as a cutting edge is the lower housing 110. A cutter 240 that protrudes outward and is provided with a second incision groove 242 in the center of the lower end of the vertical portion to receive the other end of the torsion spring 230; And,
An upper cover 310 coupled to an upper portion of the lower housing 110 and rotating together with the lower housing 110;
Consisting of, it is possible to replace and install only the parts that need repair.
The cutter 240,
If the external force does not work in the state coupled to the support pin 210, the torsion spring 230 protrudes outwardly of the lower housing 110 and the upper cover 310 to maintain the unfolded state, and has a certain size. When the above external force acts, it temporarily retreats to alleviate the shock and return to its original position by the action of the torsion spring 230,
As the lower surface of the lower housing 110 is bent at a predetermined interval and protrudes upward to form a stepped portion, the bracket engaging jaw 115 is provided. Prevents the rotation of the bracket 220 and at the same time reinforces the strength of the lower housing 110,
The lower housing 110, the support pin 210, the spring fastening bracket 220, the torsion spring 230, the cutter 240, and the upper cover 310 are made of a metal material,
The outer rim of the lower housing 110 and the upper cover 310 has a hemming process to strengthen the strength,
The inner space formed while the lower housing 110 and the upper cover 310 are combined is formed in a donut shape along the periphery except for the central portion of the lower housing 110,
As the container shape having an empty inside and a constant height as a whole, a lower cover 410 which is bolted to a central outer lower surface of the lower housing 110; the lower housing (in which a donut-shaped inner space is not formed) is further included ( While forming an additional space on the outer lower surface of the center portion 110, while strengthening the strength of the lower housing 110 and the lower cover 410 is in contact with the ground, the cutter 240 is automatically fixed on the ground. The mower cutter structure characterized by being able to be spaced apart by a distance and having a different number of lower covers 410 having different heights, so that the separation heights of the cutters 240 can be changed. In claim 1,
A fastening bolt 250 which penetrates the upper cover 310 and is fastened to the upper end of the support pin 210;
Mower cutter structure characterized in that it is further included. In claim 2,
The gap between the lower surface of the upper cover 310 and the upper end of the support pin 210 to adjust the clearance between the upper cover 310 and the lower housing 110 when the fastening bolt 250 is fastened. Adjustable washer 260;
Mower cutter structure characterized in that it is further included.
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