KR101534287B1 - Lawn trimmer - Google Patents

Abstract

The present invention relates to a blade retractable grass mower comprising: a body composed of an upper plate and a lower plate; and a blade. A protruding portion is formed in the center portion of the lower plate, and a plurality of blade embedded grooves are formed at constant intervals on one side of the protruding portion. A blade coupling member is formed on one side of the blade embedded groove, and a concave groove and the blade coupling member are formed on the upper plate so as to prevent the blade from being jammed in a gap between the upper plate and the lower plate. The present invention has effects preventing damage of a body and minimizing damage of the blade coupling member by the blade to increase durability of the body.

Description

Blade mowing mowers {LAWN TRIMMER}

More particularly, the present invention relates to a lawn mowing machine capable of protruding and retracting by a centrifugal force and minimizing a safety accident when the blade collides with a stone during a mowing operation.

Generally, a grass cutter is a device for removing a large amount of weeds by removing a weed when removing weeds or performing a weeding operation at a seedling, and the grass cutter is rotated by the power device to rotate the grass cutter in a short time, It is possible to cut out the.

The structure of the cutter is composed of a body configured to allow a worker to carry his or her back using a suspenders, an engine for generating power by being operated by fuel such as gasoline in the body, and a pipe- And a rotary blade mounted on an end of the power transmitting member and adapted to be rotated at a high speed by a power transmitted thereto to cut the grass.

At this time, the rotational power generated by the engine is transmitted to the rotating blade through the power transmitting member, so that the rotating blade rotates more than 3,000 times per minute. When the blade rotates at a high speed, if it strikes a hard foreign substance such as a stone, But also has a disadvantage that it injures the operator or the person around by the blade fragments.

Therefore, in order to protect the knife blade, a safety plate as shown in FIG. 1 is protected at the bottom of the blade so as to protect the operator.

In the past, the rotary blade is configured to project and retract from the rotary plate by a centrifugal force rotated at a high speed. When the grass is cut, the blade is projected and mowed to perform a mowing operation. When the object hits a stone, A technique for preventing a safety accident as well as a protection of a rotating blade by being folded into the inside has been disclosed in Patent Registration Nos. 10-1469821 and 10-1317832 and Utility Model Registration No. 20-0266712 .

However, the conventional lawn mowers equipped with the detachable blades are in the form of a disk and are composed of an upper plate and a lower plate that are assembled and disassembled by being coupled by fasteners, and the blade is located in a gap between the upper plate and the lower plate.

Therefore, since the blade is formed between the top plate and the bottom plate gap, which is the weakest point of the body, the body is damaged due to continuous and repetitive protrusion, thereby damaging the body.

In addition, the conventional lawn mower equipped with the detachable blades is a structure for replacing the axis of the blade with a fastener, that is, a bolt for coupling the upper plate and the lower plate.

This is because the thread is formed on the outer circumferential surface of the bolt and becomes unstable when the blade rotates. When the blade rotates and the continuous and repetitive impact is applied to the fastener, the fastening force of the fastener is loosened and the fastener is loosened. It is the possession that can cause a very serious safety accident which I do not want to do.

In addition, due to the nature of the knife blade, which is made of metal and the body is made of plastic, the nature of the knife blade repeatedly protruding and unfolding many times, This often leads to a reduction in the durability of the body and, in the case of serious damage to the body, the risk of safety accidents.

[Prior Art Literature]

1. Patent registration No. 10-l469821

2. Patent Registration No. 10-1317832

3. Utility model registration No. 20-0266712

In order to solve the above-mentioned problems, an object of the present invention is to provide a fastening device for an internal combustion engine, which comprises a top plate and a bottom plate, the fastening holes for coupling the top plate and the bottom plate, The body is prevented from being damaged by the blade, and a protrusion is formed at the central portion of the lower plate when the blade is embedded, so that a blade built-in groove is formed at one side of the protrusion, So that the blade is not caught in the gap between the upper plate and the lower plate to prevent the body from being damaged by the blade, thereby improving the durability of the lawn mower. .

According to an aspect of the present invention, there is provided a solenoid valve including a body including a top plate and a bottom plate coupled to each other through a fastener and a blade formed in the body and rotated and rotated about an axis, A cutter lawn mowing lawn mowing machine characterized in that a protruding portion is formed at a central portion of the lower plate and a plurality of blade built-in grooves are formed at a predetermined interval on one side of the protruding portion, and a blade coupling member is formed on one side of the blade- The upper plate is provided with a concave groove into which the protrusion of the lower plate is inserted and a blade coupling member corresponding to the blade coupling member of the lower plate is also formed so that the through hole of the blade is fitted to the blade coupling member and the protrusion of the lower plate is inserted into the concave groove So that the blade is not caught in the gap between the upper plate and the lower plate. The.

According to an embodiment of the present invention, the blade is formed of a straight portion on one side and a curved portion on the other side, and the straight portion is configured to be closely attached to the protruding portion.

According to an embodiment of the present invention, the protective body of the metal body is embedded in the insertion groove formed between the protrusion and the blade built-in groove to protect one side of the protrusion against which the curved line hits when the blade protrudes and retracts .

According to an embodiment of the present invention, the blade coupling member is composed of a concave groove or protrusion formed on the upper plate and the lower plate, and a cylindrical shaft inserted or fitted into the concave groove or protrusion.

According to the embodiment of the present invention, the upper surface of the upper plate is formed with a protruding jaw having a ring shape higher than the upper end height of the upper plate in the periphery of the central through hole to prevent winding of foreign matter on the rotary shaft of the lawn mower .

According to the embodiment of the present invention, the lower cover has a dish-shaped lower cover to be coupled to the lower cover, and a protruding jaw is formed at the center of the lower cover, and the upper end of the protruding jaw extends inward, The hook is engaged with a nut that engages the mower power unit and the body of the present invention, and is not detached from the mower and does not rotate irrespective of the rotation of the body.

According to the above-described effect of the knife throw-away lawn mower according to the embodiment of the present invention, the body is formed of the upper plate and the lower plate, the protrusion is formed at the central portion of the lower plate, and the blade is formed at one side of the protrusion, It is not formed in the gap between the lower plates, but flows only in the blade built-in groove of the lower plate, so that damage to the body can be prevented.

In the present invention, a separate blade coupling member is used instead of a bolt as in the prior art, and a cylindrical pipe or a cylindrical rod made of a metal is used as the blade coupling member, So that damage to the blade coupling member is minimized to enhance the durability of the body.

In addition, according to the present invention, the coupling member for coupling the body only maintains the function of the coupling member, so that the coupling state of the body can be maintained in a stable state despite the rotation of the blade at a high speed.

In the present invention, the curved portion of one side of the protruding portion protrudes when the blade rotates and protrudes. The protruding portion of the protruding portion is embedded in the insertion groove formed between the protruding portion of the metal protective body and the blade- It is a very useful invention that can enhance durability.

1 is an exploded perspective view of a blade throwing and lawn mower according to an embodiment of the present invention;
Figure 2 is a perspective view of the combined state of Figure 2;
3 is a sectional view of Fig. 2;
4 is a perspective view for explaining the use state of the present invention.
Fig. 5 is a sectional view of Fig. 4; Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. Also, the singular forms used herein include plural forms as long as the phrases do not expressly mean the opposite. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like. Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further construed to have meanings consistent with the relevant technical literature and the present disclosure and are not to be construed as ideal or official unless defined otherwise.

The embodiment of the present invention described with reference to the perspective view specifically illustrates an ideal embodiment of the present invention. As a result, various variations of the illustration, for example variations in the manufacturing method and / or specification, are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture. For example, the regions shown or described as being flat may have characteristics that are generally coarse / rough and nonlinear. Also, the portion shown as having a sharp angle may be rounded. Thus, the regions shown in the figures are merely approximate, and their shapes are not intended to depict the exact shape of the regions, nor are they intended to limit the scope of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a blade-throwing lawn mower according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of the combined state of FIG. 2, FIG. 3 is a cross-sectional view of FIG. 2, and FIG. 4 is a cross- Fig. 5 is a cross-sectional view of Fig. 4. Fig.

First, in the drawings, it is noted that the same components or parts are denoted by the same reference numerals as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

The knife protruding lawn mower 100 according to the embodiment of the present invention includes a body made of a top plate 120 and a bottom plate 110 coupled by a fastener 115, And a plurality of blade built-in grooves 112 are formed at one side of the protruding portion 111 at regular intervals, and a plurality of blind-slotted grooves 112 are formed at one side of the protruding portion 111. The blade- And a blade engaging member is formed on one side of the blade built-in groove, and a protrusion 111 of the lower plate 110 is inserted into the upper plate 120, that is, a corresponding concave groove 121 is formed, And the upper plate 120 and the lower plate 110 are fastened to each other by the fastening tool 115. The blade coupling member is formed with a blade coupling member having a blade coupling member, So that the blade 114 is not caught in the gap between the upper plate 120 and the lower plate 110 The. If the blade 114 is not inserted into the gap between the upper plate 120 and the lower plate 110, there is no breakage between the upper plate 120 and the lower plate 110, which is the weakest part of the body, This will be better.

The protrusion 111 prevents the lower plate 110 and the upper plate 120 from rotating independently because the lower plate 110 is engaged with the concave groove 121 of the upper plate 120 and the protrusion 111 So that the blade built-in groove 112 can be formed at one side of the protrusion 111. As a result, the blade 114 is formed below the upper end of the lower plate 110.

This is a very important technique in the present invention, so that the blade 114 is not located in the gap between the lower plate 110 and the upper plate 120.

In this case, two to four blade internal grooves 112 may be formed. In the two cases, the blade internal grooves 112 may be formed on both sides of the protruding portion 111, will be.

The blade 114 used in the present invention is of a protruding type, and a shaft must be formed on one side thereof. The structure for forming the shaft is represented by a blade coupling member in the present invention.

The blade coupling member includes a concave groove 112 or a protrusion 112a formed in the upper plate 120 and the lower plate 110 and a cylindrical shaft 140 inserted or inserted into the concave groove 112 or the protrusion 112a. ).

That is, when the cylindrical shaft 140 is made of a cylindrical metal rod, only a circular concave groove 112 is required. In the case of a cylindrical tube, however, (112a) is required. Of course, at this time, the structure in which the protrusion 112a is formed in the concave groove 112 can be more stably supported.

The blade 114 is formed with a through hole 114a to be engaged with the shaft 140. In this case, the shape of the blade 114 is preferably semicircular.

At this time, one side of the blade 114 is formed of a straight line portion, and the other side is formed of a curved line portion. The curved portion cuts the grass and the straight portion is in close contact with the protrusion 111 when the lower portion is embedded in the lower plate 110.

Therefore, when the knife 114 hits against a stone or a rigid object, the knife 114 repeatedly protrudes and retracts from the body. In this case, the curved portion of the knife 114 protrudes and hits one side of the protrusion 111. Therefore, the protrusion 111 is made of a plastic material and the blade 114 is made of a metal material, so that the blade 114 little by little pierces the protrusion 111, i.e., the body.

In the present invention, the projection 111 corresponding to the curved portion of the blade 114 is reinforced with a metal plate, that is, the body protecting piece 150, .

At this time, the body protection piece 150 is inserted and inserted into the insertion groove 150a formed between the protrusion 111 and the blade built-in groove. At this time, one end of the body protection piece is bent to prevent the separation of the body protection piece, Respectively.

Also, the blade coupling member having a shaft function for coupling the blade 114 is a portion where the blades 114 of the metal are abutted with each other. Therefore, when the blade 114 is made of plastic, it is easily damaged. .

The upper surface of the upper plate 120 is formed with an annular protruding protrusion 160 higher than the upper end of the upper plate 120 in the vicinity of the central through hole so as to enter the upper surface of the upper plate 120, (C) to be able to block the foreign matter or foreign objects. At this time, the height of the protruding jaws 160 may vary depending on the products and the working environment of the lawn mower of the present invention, and the difference in the height of the protruding jaws 160 protruding from the upper surface of the upper plate 120 may occur.

In addition, the present invention can be configured such that a lower cover 130 is attached to a lower part of the lower plate 110 so that the lawn mower A can be placed on the floor and can be used comfortably. Is formed in a hemispherical shape and is smoothly formed on the ground so that it can be slid well in pushing and pulling on the ground so that the convenience of mowing work can be achieved.

At this time, an annular protrusion 131 is formed at the center of the lower cover, and an upper end of the protrusion protrudes inward to form a locking protrusion 131a. The locking protrusion 131a is connected to the mower power section B And the bearing body and the nut D which are joined together at the same time so as not to be separated from the lawn mower.

However, the catching jaw 131a is not a structure that is tightened by a bearing or a nut, but is a structure that prevents the merge from being merely restrained so that it does not rotate regardless of the rotation of the lawnmower. Therefore, if the bottom is placed on the floor, the bottom cover will not rotate even if the body rotates.

Although the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the present invention is not limited thereto and that various changes and modifications will be apparent to those skilled in the art. Various modifications and variations are possible within the scope of the appended claims.

100: Inventive lawn mower
110: lower plate 111: protrusion
112: blade built-in groove 114: blade
115: fastener 120: top plate
130: lower cover 140: shaft
150: blocking plate 160: annular projection

Claims (6)

A cutter blade protruding and detaching machine comprising a body composed of an upper plate and a lower plate coupled to each other by a fastener and a blade which is built in the body and rotates about an axis,
A protrusion formed with a plurality of blade internal grooves spaced apart at regular intervals is formed at the center of the lower plate,
A blade coupling member is formed at one side of the blade-embedded groove so that the through hole of the blade is inserted into the blade coupling member,
The protrusions support the upper plate to form a gap so that the blade is not caught in the gap between the upper plate and the lower plate. Cutter-type lawn mowing machine.
The knife blast lawn mowing machine according to claim 1, wherein the blade has a straight portion at one side and a curved portion at the other side, wherein the straight line portion can be closely attached to the protruding portion.
The knife-bladder lawn mower as set forth in claim 1, wherein a metal-made body protection piece is embedded in an insertion groove formed between the protrusion and the blade-embedded groove to protect one side of the protrusion.
[3] The cutter blade of claim 1, wherein the blade coupling member comprises a concave groove or protrusion formed on the upper plate and the lower plate, and a cylindrical shaft inserted or inserted into the concave groove or protrusion.
The knife-bladder lawn mower as set forth in claim 1, wherein the upper surface of the upper plate is formed with an annular protruding jaw that is higher than the upper end height of the upper plate in the vicinity of the central hole.
[2] The apparatus according to claim 1, wherein the lower cover has a dish-shaped lower cover coupled to the lower cover, wherein a protruding protrusion is formed at the center of the lower cover, and an upper end of the protruding protrusion extends inward to form a locking protrusion Wherein the latching jaw is configured so as not to rotate regardless of the rotation of the body without being detached from the lawn mower by being caught by a nut that joins the lawnmower power unit and the body of the present invention.

Images