KR101692375B1 - Trimmer Head for Lawn Mower - Google Patents

Abstract

The present invention relates to a trimmer head capable of continuous use of a nylon string by mounting wound nylon strings therein, and more specifically, to a trimmer head for a lawn mower which reduces friction and resistance of winding a nylon string to facilitate winding. The trimmer head for a lawn mower according to an embodiment of the present invention comprises a vertical movement inclined surface which can be moved vertically and rotated in a winding reel in an operation knob provided for winding up a nylon string on the winding reel so that the operation knob does not move vertically but only the winding reel is made to be moved in the trimmer head, when winding the nylon string, thereby facilitating winding work of the nylon string.

Description

{Trimmer Head for Lawn Mower}

The present invention relates to a trimmer head for a lawn mowing machine, and more particularly, to a trimmer head capable of continuously using a nylon line by winding a nylon line therein and reducing the friction and resistance To a trimmer head for a mowing machine.

The mowers used when weeding weeds are equipped with a cutter on the circumferential surface of the trimmer head that is rotated at a high speed by a driving device so that weeds can be cut. Metal cutters and nylon line cutters are commonly used in cutters of mowers. The metal cutter is durable and can be used for a long time once installed, but there is a risk of safety accidents. The nylon line cutter is formed in the form of a thin line of synthetic resin material, and when one end is fixed to the trimmer head and then rotated, the nylon line cutter becomes a straight line by centrifugal force. Although it has the advantage of less risk of safety accidents than metal blades, it has a disadvantage that it needs to be changed from time to time because it is easily worn because of its weak durability.

In order to replace the nylon line-cutter from time to time, the trimmer head needs to be disassembled and assembled every time it is replaced, so that the replacement work is very troublesome and it is inconvenient to carry the nylon line-cutter separately. In order to solve such a problem, Korean Patent Registration No. 10-1189569 has been disclosed. Korean Patent Registration No. 10-1189569 discloses a spinning reel comprising a take-up reel in which a through hole is formed in a radial direction and in which a nylon line cutter is wound, and a take-up reel which is partially protruded from the mount head to rotate the take- A reel rotating member is provided so that a nylon line cutter can be wound around the take-up reel and mounted without disassembling the mounting head. In addition, it is also possible to provide an elastic member provided between the case and the take-up reel, a plurality of engaging projections formed on the inner surface of the case, and a plurality of serrated projections formed on the take-up reel in correspondence with the engaging projections, It is fixed to the head and it is possible to carry out stable weeding.

However, Korean Patent Registration No. 10-1189569 has a disadvantage in that the reel rotary member largely protrudes from the mounting head, and the protruding portion of the reel rotary member comes into contact with the ground or the like during the weeding operation, so that the weeding operation is not smooth. Further, when the reel rotary member is rotated to wind the nylon string cutter on the take-up reel, excessive rotation of the reel rotary member with the take-up reel is caused, and in order to release the engaging projection and the toothed- When the reel rotary member is rotated in a state of being protruded by the elastic member, the engaging protrusion and the serration protrusion are repeatedly engaged and disengaged, There is a drawback in that an excessive force is consumed in the winding operation of the nylon line cutter.

(Document 1) Korean Patent No. 10-1189569

An aspect of the present invention is to provide a trimming head for winding a nylon string therein and mounting the same thereon.

Another aspect of the present invention is to provide a trimmer head for a lawn mower that minimizes protrusion of an operating portion used in a nylon line winding operation and is easy to weave.

A winding reel including a connecting portion having a through hole through which a nylon string can pass, the reel having a nylon string wound thereon, a housing coupled to the rotary shaft of the lawnmower to form an outer appearance, A manipulation knob formed in a cylindrical shape and having one end closed by an opening of the housing and being rotatable inside the housing, the manipulation knob having a part of a circumferential surface corresponding to a connection portion of the take-up reel, And an elastic member which is located on the take-up reel and is in close contact with the take-up reel and presses the take-up reel toward the operation knob, wherein the engaging projection is formed on the upper and lower surfaces of the take-up reel, and the engaging projection corresponding to the engaging projection is formed on the inner side surface of the take- In the trimmer head for a lawn mower according to an embodiment of the present invention, the lawn mower rotates in conjunction with the housing, When the take-up reel rotates due to the engagement of the outlets, one side of the operating groove in the direction of rotation of the connecting portion is formed as a vertical surface, and the other side of the operating groove in the opposite direction in which the connecting portion rotates is inclined at 45-60 And a vertical motion inclined surface.

The operation groove of the trimming head for lawn mower according to the embodiment of the present invention is formed larger than the connection portion and is provided with a rotation clearance space for smooth rotation of the operation knob.

The trimmer head for lawnmower according to the embodiment of the present invention includes a rotation clearance space which is a space for smooth rotation of the operation knob between an inner circumferential surface of a take-up reel and an outer circumferential surface of the outer circumferential surface of the operation knob, .

A trimmer head for a lawn mower according to an embodiment of the present invention includes a grip ring groove formed in an outer peripheral surface of a closed end of an operation knob projecting to the outside of the housing and being an annular groove on the inside of the housing, And a plurality of gripping grooves are provided.

The trimmer head for lawn mower according to an embodiment of the present invention is provided with connecting portion restraining means composed of a vertical surface or grooves or protrusions for restricting the connecting portion to be located in the operating groove on the other side of the operating groove .

Therefore, the trimmer head for lawnmower according to the embodiment of the present invention can reduce the friction and resistance between the components inside the trimmer head, thereby facilitating the nylon lifting work.

Further, the trimmer head for lawn mowers according to the embodiment of the present invention minimizes the protrusion of the operating portion used in the nylon line winding work, thereby facilitating the weeding operation.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

1 is an exploded perspective view of a trimmer head for lawn mowers according to an embodiment of the present invention.
2 is a perspective view of an operation knob and a take-up reel of a trimmer head for lawn mower according to an embodiment of the present invention.
3A is a side view of an operation knob of a trimmer head for lawn mower according to an embodiment of the present invention.
3B is a plan view of the operation knob of the trimmer head for lawn mower according to the embodiment of the present invention.
3C is a bottom plan view of the operation knob of the trimmer head for lawn mower according to the embodiment of the present invention.
4 is a view showing the operation of the operation knob of the trimmer head for lawn mower according to the embodiment of the present invention.
5 is a cross-sectional view of a conventional trimmer head.
6 is a side view of a trimming head for lawn mowers according to an embodiment of the present invention.
FIG. 7 is a view showing protrusion preventing jaws of a trimmer head for lawn mowers according to various embodiments of the present invention.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Before describing the present invention in detail, it is to be understood that the present invention is capable of various modifications and various embodiments, and the examples described below and illustrated in the drawings are intended to limit the invention to specific embodiments It is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", and the like, specify that the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof is contemplated by one or more of the others But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, Software. ≪ / RTI >

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

FIG. 1 is an exploded perspective view of a trimmer head for a lawn mower according to an embodiment of the present invention, and FIG. 2 is a perspective view of an operation knob and a take-up reel of a trimmer head for lawn mower according to an embodiment of the present invention.

1 and 2, a trimmer head for lawn mowers according to an embodiment of the present invention includes: a housing 10 having an outer tube coupled to a rotary shaft of a lawn mower and having an opening at one side thereof; (42) having a through hole (43) through which a nylon string can pass, and a winding reel (40) formed into a cylindrical shape and having a housing opening An operation knob 50 provided with an operating groove 52 whose one end portion closed by the guide groove 12a is rotatable inside the housing 10 and which has a part of the circumferential surface corresponding to the connection portion of the take- An elastic member 20 located inside the housing 10 and brought into close contact with the take-up reel 40 to press the take-up reel 40 toward the operation knob 50; The housing 10 is abraded by friction with the housing 10 when it protrudes and rotates Includes; take-off guide (30) for preventing. A coupling protrusion 44 is formed on the upper and lower surfaces of the take-up reel 40 and a coupling protrusion 13 corresponding to the coupling protrusion 44 is formed on the inner side surface of the housing 10.

When the take-up reel 40 is rotated by the engagement of the engaging projection 44 with the engaging projection 13, the operation knob 50 is rotated by the rotation of the connecting portion 42, And the other side of the operating groove 52 in the opposite direction in which the connecting portion 42 is rotated is a vertical movement inclined surface 45a inclined at 45 ° to 60 °, (52b). The other side of the operating groove 52 in which the vertical motion slope 52b is formed is formed in a position where the connecting portion 42 of the take-up reel 40 and the connecting portion 42 of the take-up reel 40 are engaged with each other when the operation knob 50 is rotated to wind the nylon string on the take- So that the operating groove 52 comes into contact. The vertical motion slope 52b is formed to be inclined at an angle of 45 ° to 60 ° to push the connection portion 42 upward. The operation of the operation knob 50 and the vertical motion slope 52b in the nylon line winding operation follows the description related to Fig.

The operation knob 50 includes an operation knob protrusion 55 protruding out of the housing 10 and an operation knob internal portion 51 built in the interior of the housing 10. The operation knob protrusion 55, The housing 55 is provided with a plurality of gripping grooves 55b having grooves 55a which are annular grooves inside the housing 10 and which are recessed outwardly of the housing 10. The grip ring groove 55a and the grip groove 55b facilitate the grip of the operation knob projection 55. [ The present invention aims at minimizing the operation knob protrusion 55. However, as the size of the operation knob protrusion 55 becomes smaller, it is difficult to grasp and rotate the operation knob 50, which results in a dilemma. Therefore, in order to rotate the operation knob 50, a grip ring-shaped groove 55a and a grip groove 55b are provided. The grip groove 55b is similar to the unevenness applied to a general rotary type operation lever. The grip ring-shaped groove 55a positions the fingertip inside the annular groove when gripping the operation knob projection 55, thereby increasing the contact surface between the hand and the operation knob 50. [ In addition, the outer side of the housing 10 of the operation knob projection 55 by the grip ring-shaped groove 55a has a shape protruding to the opposite side, and this protruding shape is more advantageous for gripping. The grip ring groove 55a is simultaneously applied to the grip groove 55b to double the gripping effect. The gripping and rotating operation of the operation knob 50 can be facilitated by the gripping annular groove 55a and the gripping groove 55b even if the operation knob protrusion 55 is formed flat compared with the conventional one.

The operation knob 50 is provided between the operation knob projection portion 55 and the operation knob built-in portion 51 and is provided with an annular projection 50 for limiting the range in which the operation knob 50 protrudes out of the housing 10. [ , And a rotation clearance space catching means (53) for maintaining a constant interval between the take-up reel and the operation knob. Details of the rotation clearance spacing means 53 follow from the following description related to Figs. 3A to 3C.

FIG. 3A is a side view of an operation knob of a trimming head for lawn mower according to an embodiment of the present invention, FIG. 3B is a plan view of an operation knob of a trimming head for lawn mower according to an embodiment of the present invention, FIG. 3 is a bottom plan view of the operation knob of the trimmer head for lawn mowers according to FIG.

3A to 3C, the operation knob 50 of the trimmer head for lawn mowers according to the embodiment of the present invention includes an operation knob protrusion 55 protruding to the outside of the housing 10, And an operation knob built-in portion 51. The operation groove 52, the rotation clearance space catching means 53, and the projection preventing jaw 54 are provided.

The protrusion preventing hook 54 is formed to be larger than the opening formed at one side of the second housing 10 so that only the operation knob projection 55 protrudes from the opening and the operation knob built- .

The operation groove 52 of the trimming head for lawn mower according to the embodiment of the present invention is formed larger than the connection portion 42 and has a rotation clearance space V1 for smooth rotation of the operation knob 50, .

One side of the operating groove 52 in the rotating direction of the trimmer head is formed as a vertical surface 52a at the time of weeding, and the other side in the direction opposite to the rotation of the trihex head is formed as a vertical movement inclined surface 52b at the time of weeding. It is preferable that the operating groove 52 in which the vertical motion slope 52b starts is formed larger than the connecting portion 42. [ This is because when the operating groove 52 and the connecting portion 42 are in close contact with each other, the action of the operating groove 52 to rotate the connecting portion 42 upwardly, even if the vertical moving inclined surface 52b is formed, It is difficult to generate smoothly. When the operating recess 52 is formed to be larger than the connecting portion 42 and the rotational clearance space V1 is provided between the vertical motion inclined surface 52b and the connecting portion 42, The connecting portion 42 is horizontally moved relatively in the first direction V1 and the horizontal movement due to the rotational motion of the vertical movement slanting surface 52b can smoothly lead to the vertical movement of the connecting portion 42. [

The inclined surface connecting curved surface 52c may be formed between the vertical motion inclined surface 52b and the operating groove 52. The vertically moving inclined surface 52b of the connecting portion 42, A rounded joint edge curved surface 42a can be formed. The inclined surface connecting curved surface 52c and the connecting portion curved surface 42a are formed at a point where the operating knob 50 is rotated so that the operating groove 52 and the connecting portion 42 first make contact when they come into contact with each other. As described above, the action of pushing up the connecting portion 42 upward by the vertical motion slanting surface 52b is very important in the environment at the time when the action is first generated. The upward movement of the connection portion 42 is stable while the connection portion 42 is positioned on the vertical movement slope 52b. However, if the vertical movement slope 52b is in the state of relatively moving horizontally relative to the vertical movement slope 52b, Is required to have a strong force due to excessive resistance and friction as compared with horizontal movement, and noise and vibration are generated at the moment when horizontal movement is converted into vertical movement. The rotation clearance space V1 and the inclined surface connecting curved surface 52c and the connecting corner curved surface 42a are means for alleviating this problem. The inclined surface connecting curved surface 52c and the connecting portion curved surface 42a also serve to alleviate the abrasion due to continuous contact.

The trimmer head for lawn mowers according to the embodiment of the present invention is provided between the inner peripheral surface of the take-up reel 40 and the outer peripheral surface of the operation knob internal portion 51, (V2). The rotation clearance V2 is spaced apart from the inner peripheral surface of the take-up reel 40 and the outer peripheral surface of the operation knob built-in portion 51 at a predetermined interval as shown in Fig. 3B. The inner peripheral surface of the take-up reel 40 and the outer peripheral surface of the operation knob built-in portion 51 can be rotated mutually without friction by the rotation clearance space V2 so that the force applied when rotating the operation knob 50 is remarkably reduced do.

The rotation clearance V2 is basically provided such that the diameter of the outer peripheral surface of the operation knob internal portion 51 is smaller than the diameter of the inner peripheral surface of the take-up reel 40. [ An annular groove 45 is formed at the edge of the inner peripheral surface of the take-up reel 40 and an annular projection 45 is formed on the upper portion of the projecting preventing stopper 54 corresponding to the reel inner annular groove 45, When the rotary clearance clearance means 53 is formed and the rotary clearance space catching means 53 is seated in the reel inner ring groove 45, the diameter of the inner peripheral surface of the take-up reel 40 and the diameter of the inner peripheral surface of the operation knob interior portion 51 The rotary clearance space V2 formed by the difference in the diameter of the outer circumferential surface is uniformly distributed between the inner circumferential surface of the take-up reel 40 and the outer circumferential surface of the operation knob interior portion 51, and such uniform spacing is stably maintained do. The frictional force is generated by the close contact between the reel inner ring groove 45 and the rotating clearance space 53, but the frictional resistance is remarkably reduced because the frictional area is remarkably reduced.

The rotation clearance space V1 and the inclined surface connection curved surface 52c and the coupling edge curved surface 42a and the rotation clearance space V2 can be easily wound around the take-up reel 40 It also plays a role. Conventional trimmer heads having a structure in which durability components are in tight contact with each other, when a plurality of nylon strings are wound on the take-up reel, the nylon string is kept elastic while the nylon string is enlarged in radius, The adhesion to the guide increases and the internal friction increases. The trimmer head for lawnmower according to the embodiment of the present invention is provided with a rotation clearance space V1 and a rotation clearance space V2 between the operation knob 50 and the take-up reel 40, The friction area between the durability components is remarkably reduced, so that the increase in the overall frictional force is not increased. The inclined surface connecting curved surface 52c and the connecting portion curved surface 42a are formed so that the inclined surface connecting curved surface 52c and the inclined surface connecting curved surface 42c are inclined in the vertical direction by the vertical moving inclined surface 52b of the operation knob 50, The transmission efficiency of the vertical stress of the rotational motion during the initial operation in which the connecting portion corner curved surface 42a starts to contact is increased. The rotational force applied to the operation knob 50 is converted into a force for vertically pushing the connecting portion 42 in accordance with the inclination of the vertical motion inclined surface 52b. At the time of the first contact of the connecting portion 42 to the vertical motion inclined surface 52b in the conversion of the vertical motion of the rotary motion, the resistance and the friction become maximum at the time when the connecting portion 42 first contacts the vertical motion inclined surface 52b. The slope of the vertical motion slope 52b at the time of contact is lowered, and the stress conversion efficiency is instantaneously increased. This arrangement makes it possible to reduce the inconvenience of the conventional trimmer head in which the reel rotary member must be pushed inward with a stronger force in response to the stronger friction

A through hole 43 and a display 56 are provided on the closed end side of the operation knob 50 to indicate the point where the through hole 43 of the take-up reel 40 coincides with the draw-out guide 30 of the housing 10 .

4 is a view showing the operation of the operation knob of the trimmer head for lawn mower according to the embodiment of the present invention.

4, when the operation knob 50 of the trimming head for lawn mower according to the embodiment of the present invention is rotated in the knob operation direction, the connection portion 42 is engaged with the operation groove 52, It also rotates. When the take-up reel 40 is rotated by the rotation of the connecting portion 42, the engaging projections 44 formed on the upper and lower sides of the take-up reel 40 are engaged with the engaging projections 44 and the engaging projections 13 are brought into contact with each other. The engaging protrusions 44 are vertically formed on the surfaces to which the engaging protrusions 13 are engaged and are formed on the opposite surfaces of the engaging protrusions 44. When the engaging protrusions 13 come into contact with the inclined surfaces of the engaging protrusions 44, Is wound on the engaging projection 13 and the winding reel 40 is continuously rotated to wind the nylon string.

FIG. 5 is a cross-sectional view of a conventional trimmer head. As shown in FIG. 5, in the conventional trimmer head 1, when the conventional operation knob 2 is rotated, the conventional take-up reel 3 rotates. The configuration of the conventional locking projection 4 and the conventional serrated projection 5 is the same as that of the engaging projection 44 and the engaging projection 13 of the present invention. However, when the conventional operation knob 2 is rotated, not only the conventional take-up reel 3 but also the conventional operation knob 2 can be prevented from being deformed by the thickness of the conventional engaging projection 4 and the conventional serration- 'As shown in FIG. In other words, when the conventional operation knob 2 is rotated, the conventional operation knob 2 rattles and is pulled into the interior of the conventional trimmer head 1 and is repeatedly protruded. This phenomenon causes the power of the nylon string to be consumed. Otherwise, the conventional operation knob 2 must be rotated in the state in which the conventional operation knob 2 is pulled by 'e'. To overcome such a problem, the conventional operation knob 2 generally has a large protruding width 'd'. Since the length from 'd' to 'e' is consumed in the middle of the process of rotating the conventional operation knob 2. However, it is natural that the larger the 'd', the protrusion width of the protrusion, the less smooth the weeding operation.

4, when the operation knob 50 is rotated, the operation knob 50 does not move up and down, and only the take-up reel 40 is engaged with the engagement projection (not shown) 44 and the engagement protrusion 13 by the height "E". The operation knob 50 is moved upward and downward by 'E', but the connecting portion 42 receives the rotational force by the vertical motion inclined surface 52b and moves up and down by 'E'.

6, a trimmer head for a lawn mower according to an embodiment of the present invention is a trimming head for a lawn mower according to an exemplary embodiment of the present invention, as shown in FIG. 6, which is a side view of a lawn mower trimmer head according to an embodiment of the present invention. The length of the protruding portion is reduced by the protruding width 'D' of the knob protruding portion 55. The 'D' can be reduced in length by at least 'E' compared to the conventional 'd'. As the length of the protrusion decreases to 'D', it is natural that the weeding work becomes smooth.

Further, since the operation knob 50 itself flows only in the take-up reel 40 rather than in the up-and-down direction, the winding operation can be smoothly performed, and the force for winding can be significantly reduced.

FIG. 7 is a view showing protrusion preventing jaws of a trimmer head for lawn mowers according to various embodiments of the present invention.

7, the trimmer head for lawn mowers according to the embodiment of the present invention is provided with a vertical surface (not shown) for restricting the connection portion 42 to be located in the operation groove 52, And a connecting portion restraining means (52d) composed of grooves or protrusions. The connecting portion restricting means 52d serves to make the connecting portion 42 movable only within a certain range of the operating groove 52. [

The connecting portion restraining means 52d restricts the movement of the connecting portion 42 in the operating recess 52 and forces the operating knob 50 excessively when the foreign substance enters the inside of the housing 10, .

It is general that the connecting portion 42 flows only by the height E of the engaging projection 44 and the engaging projection 13 in the upper and lower portions and only the bottom portion of the operating groove 52 in the left and right. However, when the foreign matter enters the inside of the housing 10 and penetrates between the operation groove 52 and the connection portion 42, the above-mentioned general operation is interrupted. In such a case, the operation is attempted by exerting an excessive force on the operation knob 50. Since excessive operation leads to damage to the internal components, a safety device for restricting excessive operation of the operation knob 50 in the event of failure or failure . When the user operates the operation knob 50, the user only operates to move the connection portion 42 within a certain range within the operation knob 50. If the winding operation is not smoothly performed even if the operation is performed up to the operation limit range, It is possible to disassemble the head and carry out the maintenance.

The connecting portion restraining means 52d includes a vertical surface provided at the end of the vertical motion slanting surface 52b of <a>, a vertical surface provided in the middle of the vertical motion slanting surface 52b of <b>, a vertical motion slanting surface 52b And a protrusion provided on an upper portion of the groove. The embodiment of <a> and <b> restricts the horizontal movement of the connection portion 42, and the embodiment of <c> restricts the vertical movement of the connection portion 42.

As described above, the trimmer head for lawn mowers according to the embodiment of the present invention has a vertical napkin slope which allows the operation knob to rotate in order to wind the nylon string on the take-up reel, Thus, it can be seen that the operation knob is not moved up and down when the nylon line is wound, and only the winding reel is allowed to flow in the trimmer head, thereby facilitating the nylon string winding work.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but rather are not intended to limit the scope of the technical idea of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1 ... Conventional trimmer head
2 ... Conventional operation knob
3 ... Conventional take-up reel
4 ... Conventional locking device
5 ... Conventional serrated projection
10 ... housing
11 ... first housing
12 ... second housing
12a ... housing opening
13 ... engaging projection
20 ... elastic member
30 ... withdrawal guide
40 ... take-up reel
41 ... winder
42 ... connection
42a ... curved corner edge
43 ... through hole
44 ... engaging projection
45 ... reel inner annular groove
V1 ... rotation clearance space
V2 ... rotation clearance
50 ... Operation knob
51 ... Operation knob internal part
52 ... operation home
52a ... vertical plane
52b ... vertical motion slope
52c ... inclined surface connection surface
52d ... connection restraining means
53 ... rotation clearance clearance means
54 ... protrusion prevention jaw
55 ... Operation knob protrusion
55a ... phalanx annular groove
55b ... phage groove
56 ... common through and marked

Claims (5)

A winding reel including a connecting portion having a through hole through which a nylon string can pass, the reel having a nylon string wound thereon, a housing coupled to the rotary shaft of the lawnmower to form an outer appearance, A manipulation knob having a cylindrical shape and having one end closed by an opening of the housing and being rotatable inside the housing, the manipulation groove having a part of a circumferential surface corresponding to the connection part of the take-up reel, And an elastic member which is located inside the housing and which is in close contact with the take-up reel and presses the take-up reel toward the operation knob, wherein a coupling protrusion is formed on the upper and lower surfaces of the take-up reel, And a coupling protrusion corresponding to the projection,
When the take-up reel rotates by engaging with the engaging projection and the engaging projection, when the lawn mower rotates in conjunction with the housing,
One side of the operating groove in the direction in which the connecting portion rotates is formed as a vertical surface,
And the other side of the operating groove in the opposite direction in which the connecting portion rotates includes a vertical motion inclined surface inclined at 45 to 60 degrees,
And the vertical movement inclined surface includes a connecting portion restricting means for restricting the connecting portion to be located in the operating groove, the connecting portion restricting means including a vertical surface,
Characterized in that the trimmer head for lawn mowing is provided.
The method according to claim 1,
Wherein,
A rotation clearance space formed to be larger than the connection portion and for smooth rotation of the operation knob,
Wherein the trimmer head is provided with a tapered portion.
The method according to claim 1,
Between an inner peripheral surface of the take-up reel and an outer peripheral surface of the outer peripheral surface of the operation knob,
A rotation clearance space which is a clearance space for smooth rotation of the operation knob,
Wherein the trimmer head is provided with a tapered portion.
The method according to claim 1,
On an outer circumferential surface of a closed end of the operation knob projecting to the outside of the housing,
And a grip ring-shaped groove, which is an annular groove, is provided on the inside of the housing,
And a plurality of gripping grooves, which are concave grooves,
Wherein the trimmer head is a trimmer head.
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