KR102574531B1 - Grass cutter head with bottom safety cover - Google Patents

Abstract

The present invention relates to a mower, which removes weeds, grass, or shrubs or vines growing low on the ground and, more particularly, to a mower head with a safety plate, which has a function for bringing the safety plate into contact with the ground during mowing work and enabling safe and convenient mowing work. The present invention provides the novel mower head with the safety plate, which has the safety plate attached to a lower side of the mower head to enable mowing work while the safety plate makes contact with the ground, and enables safe and convenient mowing work while the safety plate makes contact with the ground during mowing work. Therefore, the mower head enables users to easily perform mowing without much effort, enables mowing at a uniform height, thereby improving mowing quality, can minimize that a wire cutter runs against the ground or surrounding objects, thereby ensuring worker safety, and enables the users to withdraw, by a predetermined length, and use the wire cutter by using an upper and lower double locking structure when the users withdraw and use the wire cutter for abrasion or cutting, thereby preventing wastage of the wire cutter such as excluding the trouble that the wire cutter is excessively loosened at one time, and enabling efficient mowing work without wasting time.

Description

Grass cutter head with safety plate {GRASS CUTTER HEAD WITH BOTTOM SAFETY COVER}

The present invention relates to a mowing machine that removes weeds, grass, or shrubs or vines growing low on the ground, and in particular, a mowing machine equipped with a safety plate that enables safe and convenient operation while in contact with the ground surface during mowing. It's about the head.

In general, lawn mowers are widely used as an automated tool for effectively removing weeds, grass, or shrubs or vines growing low on the ground.

Such a mower includes a power unit composed of a 2- or 4-cylinder prime mover attached to a suspender so that it can be carried on the shoulder, a connecting pipe for transmitting driving force from the power unit, a grip handle mounted on the connecting pipe, and , a head including a cutter rotatably mounted on the lower end of the connecting pipe, and the like.

In addition, metal cutters, nylon cutters, etc. are used as cutters for lawnmowers. Metal cutters are easy to remove small-diameter tree branches and have good efficiency in cutting weeds. In this case, metal cutters or rocks are damaged, and in this process, there are many cases in which fragments bounce and cause safety accidents.

In recent years, considering this point, wire cutters made of synthetic resin are often used when cutting relatively soft grass such as weeds or grass, rather than thick branches. There are some inconveniences such as doing.

In general, during mowing, workers work while lifting the mower head to a certain extent from the surface of the ground where the cutter is mounted. Since it is difficult to perform work while maintaining the height of the head constantly, it is difficult to mow at a uniform height, and there is a risk of soil or stones hitting the cutter and bouncing.

Publication No. 10-2022-0045707 Publication No. 10-2022-0121588 Registered Patent Publication No. 20-0493100 Registered Patent Publication No. 10-1369492

Therefore, the present invention has been devised in view of the above, and a safety plate capable of working against the ground surface is attached to the lower part of the mower head, and the safety plate can contact the ground surface during mowing work to safely and conveniently work. By implementing a new type of mowing machine head that can easily and effortlessly mow, the quality of mowing can be improved by enabling mowing of a uniform height, and the impact of the wire cutter on the ground or surrounding objects can be minimized to improve worker safety. An object of the present invention is to provide a lawnmower head equipped with a safety plate capable of promoting safety.

In addition, another object of the present invention is to use an upper and lower double locking structure to always withdraw and use the wire cutter at a constant length when the wire cutter is pulled out due to wear or cutting, so that the wire cutter is released a lot at once. It is an object of the present invention to provide a lawnmower head equipped with a safety plate capable of efficiently performing work without wasting time and preventing waste of wire cutters, such as eliminating the waste of time.

In order to achieve the above object, the lawnmower head provided with the safety plate provided by the present invention has the following characteristics.

The brush cutter head equipped with the safety plate has a space for accommodating parts such as a wire cutter winder, spring, cover, etc. inside and a wire cutter pull-out part for withdrawing the wire cutter on the outer periphery, and is connected to the drive unit of the brush cutter and is rotatable. An upper case and a lower case capable of moving up and down at the same time, a cover closing the upper part of the lower case, and a coaxial structure installed in the space of the upper and lower cases to rotate together with the upper and lower cases, and wire cutters can be wound on the outer circumferential surface A wire cutter winder in which a wire cutter winding groove is formed and a wire cutter through hole into which a wire cutter can be inserted communicates with the wire cutter winding groove and is formed along the radial direction, and the cloth of the cover inside the upper and lower cases A spring installed between the scene and the upper surface of the wire cutter winder to elastically support the wire cutter winder downward at all times, and a coaxial structure installed in the center of the lower surface of the wire cutter winder via a bearing, A contactable safety plate, a first locking jaw formed at regular intervals along the circumferential direction on a flat surface of the outer surface of the bottom surface of the wire cutter winder, and formed at regular intervals along the circumferential direction on a flat surface of the inner bottom surface of the lower case. At the same time, it is composed of a first locking jaw facing each other from above and below and a second locking jaw that can engage, and includes a main locking device that allows the upper and lower case side and the wire cutter winder side to rotate together.

The brushcutter head equipped with such a safety plate has a first holding jaw formed at regular intervals along the circumferential direction on the plane of the outer edge of the upper surface of the wire cutter winder and the upper surface of the cover at regular intervals along the circumference on the plane of the outer edge of the ceiling surface of the cover. At the same time, a sub-locking device composed of a first holding jaw facing each other from above and below and a second locking jaw capable of engaging with each other and restraining the independent rotation of the wire cutter winder may be further included, and the first locking at this time The pitch of the jaw and the second latch may be formed at a relatively larger pitch than the pitch of the first latch and the second latch in the main locking device.

Here, the first locking jaw of the main locking device may be formed in a tapered shape extending from one vertical surface to an inclined surface toward the other side, and the first locking jaw of the sub-locking device also extends from one vertical surface toward the other. It may be made of a tapered shape leading to an inclined surface.

As a preferred embodiment, the wire cutter winding groove of the wire cutter winder is divided into an upper wire cutter winding groove and a lower wire cutter winding groove by an intermediate partition wall, and the partition wall at a position in contact with both ends of the wire cutter through hole, respectively Streamlined arc-shaped guides facing upwards and downwards may be respectively formed.

In a preferred embodiment, the upper case and the lower case are coupled in a detachable structure by an elastic clip on the upper case side that can be fastened and released and a hooking piece on the lower case side, leaving only the upper case on the mower side and wire The entire lower case including the cutter winder, spring, cover, and safety plate can be separated separately.

Further, the safety plate is made of a disc having a relatively larger diameter than the diameter of the upper and lower cases, and at the same time, a case receiving groove capable of accommodating the downward movement of the upper and lower cases may be formed at the center of the disc.

The lawnmower head provided with the safety plate provided by the present invention has the following effects.

First, by applying a new mower head with a safety plate attached to the lower part of the mower head to perform mowing work on the ground surface, it is possible to perform mowing work quickly and conveniently without difficulty while contacting the safety plate to the ground surface during mowing work, By using the safety plate, the height of the wire cutter can be kept constant on the ground, so that the quality of mowing can be improved, such as mowing at a uniform height. There is an effect that can promote the maximum.

Second, when pulling out the wire cutter due to abrasion or cutting during mowing, it is possible to pull out the wire cutter to a certain length with a simple operation of pressing the mower head once, thereby improving workability such as easy and fast mowing. There is an effect that can be improved.

Third, when pulling out the wire cutter due to wear or cutting during mowing, the wire cutter can always be drawn out at a constant length by using the double locking structure of the lower main locking device and the upper sub locking device, so that the wire There is an effect of preventing waste of wire cutters and efficiently performing work without wasting time, such as preventing the waste of wire cutters, such as being able to eliminate frustrations such as cutters being unwound a lot at once.

Fourth, by adopting a structure that binds the safety plate and the wire cutter winder using a fixing pin when separating and combining the case including the wire cutter winder, etc., it is easy to separate and combine the case for supplementing the wire cutter. There is an effect that can do it.

Fifth, when the wire cutter wound on the wire cutter winder is pulled out, by adopting an arc-shaped streamlined guide having an up and down direction, the wire cutter can be pulled out smoothly and damage to the wire cutter can be prevented. There are possible effects.

Sixth, there is an effect of simplifying the wire cutter winding work, such as easily inserting and winding the wire cutter by using the pin hole in the disk and the pin groove in the wire cutter winder.

1 to 4 are perspective views showing a grass clipper head equipped with a safety plate according to an embodiment of the present invention;
5 and 6 are cross-sectional views showing a state of use of a grass clipper head equipped with a safety plate according to an embodiment of the present invention.

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

1 to 4 are perspective views illustrating a lawnmower head having a safety plate according to an embodiment of the present invention.

As shown in FIGS. 1 to 4 , the lawnmower head equipped with the safety plate includes an upper case 12 and a lower case 13 as means for accommodating parts.

The upper case 12 has a circular housing shape, and a nut member 28 is mounted in the center of the top plate, and by using this, it is coupled to the driving part of the mower, that is, the driving shaft (not shown) of the mower by a screw fastening structure to provide power. can be delivered.

In addition, on both sides of the vertical wall of the upper case 12, wire cutter outlets 29a in a form detached from the lower end in a rectangular shape are formed, so that the wire cutter drawn outward does not interfere with the upper case 12. be able to come out

The lower case 13 has a circular ring shape with a vertical wall, and a belt-shaped winder seating portion 30 protrudes horizontally around the lower end of the inner circumferential surface. The second locking jaw 21b of the main locking device 21 can be formed on a plane.

In particular, a wire cutter withdrawing portion 11 for withdrawing the wire cutter is formed on the outer circumferential portion of the lower case 13, and the wire cutter withdrawing portion 11 at this time is caused by friction with the wire cutter when withdrawing the wire cutter. It is made of a structure that can demonstrate durability and can be easily replaced.

To this end, the wire cutter lead-out part 11 has a hole 31 penetrating the thickness for the passage of the wire cutter and guide protrusions 32 on both side surfaces, and is a rectangular block made of metal or plastic material. 34, and on both sides of the vertical wall of the lower case 13, a wire cutter outlet 29b in the form of a square shape detached from the top is formed, and guides are formed on both sides of the wall of the wire cutter outlet 29b. Each groove 33 is formed, and the block 34 is coupled to the wire cutter outlet 29b from top to bottom using a guide protrusion 32 inserted into the guide groove 33, and is installed in a detachable structure. .

Accordingly, when the hole 31 of the block 34 is worn due to friction during withdrawal and contact of the wire cutter, it can be easily replaced and used by removing the worn one from the top and inserting a new one below.

At this time, the wire cutter outlet 29b in which the block 34 is installed and the wire cutter outlet 29a in the upper case 12 can be aligned at the same position.

The upper case 12 and the lower case 13 form a space 10 capable of accommodating parts such as the wire cutter winder 17, the spring 18, and the cover 14 therein while being coupled to each other. The upper and lower cases 12 and 13 coupled in this way can be rotated by receiving power from the drive shaft of the mowing machine, and at the same time can be moved up and down together by the force that the operator presses from top to bottom and the restoring force of the spring 18 there will be

And, the upper case 12 and the lower case 13 are combined in a detachable structure capable of facilitating wire cutter replacement work and inspection work.

To this end, elastic clips 25 are formed on both sides of the vertical wall of the upper case 12 (for example, at a position 180 ° apart from the wire cutter outlet on the vertical wall), and the lower part of the corresponding position. Hook pieces 26 are formed on both sides of the lower edge of the case 13, respectively.

Accordingly, the upper case 12 and the lower case 13 can be separated from each other and coupled together using the elastic clip 25 and the engaging piece 26 that can be fastened and released from each other.

That is, when the upper case 12 is pressed while the elastic clip 25 and the hooking piece 26 are aligned when the upper and lower cases 12 and 13 are coupled, the elastic clip 25 is bent inward and As it is restored to the outside again, it can be caught on the hooking piece 26, so that the upper case 12 and the lower case 13 can be coupled, while the elastic clip 25 when the upper and lower cases 12 and 13 are separated. ) is slightly pressed inward, the engagement between the elastic clip 25 and the hooking piece 26 is released, so if the upper case 12 is pulled up in this state, the upper case 12 and the lower case 13 can be separated. be able to

Since the upper and lower cases 12 and 13 are made of a detachable and combinable structure, when replacing the wire cutter or inspecting the mower head, the power unit, connecting pipe, grip handle, etc. are heavy and difficult to handle. Leaving only the upper case 12 in the body, that is, leaving only the brush cutter body including the upper case 12 apart, including the wire cutter winder 17, spring 18, cover 14 and safety plate 20 It is convenient to work in a state where the entire lower case 13 is separated.

In addition, the lawnmower head equipped with the safety plate includes a cover 14 as a means for closing inner parts of the lower case such as the spring 18.

The cover 14 is in the form of a disc having a vertical rim at the edge, and is installed at the upper end of the open lower case 13 in a screw fastening structure.

The cover 14 installed in this way prevents the spring 18 or the wire cutter winder 17 inside the lower case 13 from coming out when the lower case 13 is separated from the upper case 12. It plays a role of giving, and accordingly, when the upper and lower cases 12 and 13 are separated, the lower case 13 side can be removed in the form of a bundle.

In addition, the lawnmower head equipped with the safety plate includes a wire cutter winder 17 as a means for winding and unwinding the wire cutter.

The wire cutter winder 17 has a cylindrical shape and has a coaxial structure with the upper and lower cases 12 and 13 inside the space 10 of the upper and lower cases 12 and 13, that is, inside the lower case 13. While positioned, it is rotatably installed together with the upper and lower cases 12 and 13.

A wire cutter winding groove 15 for winding the wire cutter is formed on the outer circumferential surface of the wire cutter winder 17, and the wire cutter winding groove 15 at this time is formed along the outer circumferential surface in the middle of the upper and lower widths of the wire cutter winder It is divided into an upper wire cutter take-up groove 15a and a lower wire cutter take-up groove 15b by the partition wall 23, so that one row of wire cutters has an upper wire cutter take-up groove 15a and a lower wire cutter take-up groove ( 15b) can be wound up and down at the same time.

Further, in the wire cutter winder 17, a wire cutter through hole 16 is formed along the radial direction at an intermediate position in the upper and lower widths of the wire cutter winder to insert the wire cutter, and the wire cutter through hole 16 formed in this way ( Both ends of 16) communicate with the wire cutter take-up groove 15.

Accordingly, after inserting one wire cutter into the wire cutter through hole 16, the length of the wire cutter is lengthened on both sides (eg, after inserting the middle part of the wire cutter length into the wire cutter through hole), and then the wire cutter When the winder 17 is turned in one direction, the length of the wire cutter pulled from one side is wound around the upper wire cutter winding groove 15a, and the length of the wire cutter pulled from the opposite side is wound around the lower wire cutter winding groove 15b. to be wrapped in

Similarly, when the wire cutter winder 17 is turned in the opposite direction, the wire cutters wound in the upper and lower wire cutter winding grooves 15a and 15b are unwound on both sides at the same time.

In particular, both ends of the wire cutter through-hole 16 are located on both sides of the partition wall 23 that divides the wire cutter winding groove 15 into an upper wire cutter winding groove 15a and a lower wire cutter winding groove 15b. Arc-shaped streamlined guides 24 facing upwards and downwards, respectively, are formed at contact positions (eg, positions 180° apart from each other).

Accordingly, when the wire cutter is wound after inserting one line of the wire cutter into the wire cutter through hole 16, the length of the wire cutter on both sides is naturally guided up and down by the respective streamlined guides 24 to prevent scratching, pressing, etc. It is possible to smoothly wind the upper wire cutter winding groove (15a) and the lower wire cutter winding groove (15b) without damage.

As a preferred embodiment, a handle 35 formed in the shape of a hexagon or an octagon is located in the central region of the bottom surface of the wire cutter winder 17, for example, in the inner region of the region where the first holding jaw 21a is formed. ) is formed, and accordingly, when the wire cutter is wound around the wire cutter winder 17, the wire cutter can be easily and quickly wound by holding the handle 35 and turning the wire cutter winder 17.

As a preferred embodiment, two pin grooves 39 are formed on the bottom surface of the wire cutter winder 17 at an angle difference of 180 °, and the two pin holes 40 thus formed are wire cutter through holes 16 ) and can be positioned side by side.

That is, the imaginary line connecting the two pin grooves 39 and the center line of the wire cutter through hole 16 can be positioned parallel to each other.

In addition, the lawnmower head equipped with the safety plate includes a spring 18 as a means for elastically supporting the wire cutter winder 17 .

The spring 18 is coaxial with the upper and lower cases 12 and 13 and supported at both ends between the ceiling surface of the cover 14 and the upper surface of the wire cutter winder 17 inside the upper and lower cases 12 and 13. is installed to always elastically support the wire cutter winder 17 downward.

Accordingly, in a state where no external force is applied, the wire cutter winder 17 is pushed downward by the expansion force exerted by the spring 18, and eventually the first holding jaw 21a in the wire cutter winder 17 ) and the second locking jaw 21b in the lower case 13 can maintain an engaged state.

Here, the upper end of the spring 18 is supported by being inserted into the protruding portion around the through-hole on the ceiling surface of the cover 14, and the lower end of the spring seat plate 36 installed on the upper surface of the wire cutter winder 17. ), it is supported and maintained in the correct position.

In addition, the mower head equipped with the safety plate includes a safety plate 20 as a means for performing the mowing operation while setting the mower head against the ground and setting a standard.

The safety plate 20 is made of a disk having a relatively larger diameter than the diameter of the upper and lower cases 12 and 13, and at this time, the central portion of the disk can accommodate it when the upper and lower cases 12 and 13 move downward. A case receiving groove 27 is formed.

A bearing accommodating portion 37 accommodating the bearing 19 is installed at the center of the wire cutter winder 17, and a safety plate fixing bolt 38 is installed in the bearing accommodating portion 37 installed in this way to support the bearing 19. By penetrating the inner ring and being fastened to the center of the lower surface of the wire cutter winder 17, the safety plate 20 can be fixedly installed on the lower surface of the wire cutter winder 17.

At this time, the safety plate 20 is installed in a structure supported on the side of the wire cutter winder 17 with the bearing 19 therebetween, so that it does not rotate together even when the wire cutter winder 17 rotates. A fixed state can be maintained.

Accordingly, during mowing work, it is possible to work while supporting the lowermost safety plate 20 against the ground surface, so there is no effort to work, and since the safety plate 20 blocks protrusions such as stones on the ground surface, the wire wire It is possible to prevent the risk of bouncing stones, etc., such as the cutter being able to remove only grass or miscellaneous trees without hitting the ground surface without colliding with protrusions, and also pushing the safety plate 20 against the ground surface and using it as a reference body to push or left and right Since mowing can be performed while moving, the mowing height can be maintained uniformly.

As a preferred embodiment, two pin holes 40 penetrating through the thickness are formed on one side of the safety plate 20, for example, at an angle difference of 180 °, and the pin hole formed in this way ( 40) is used to conveniently wind the wire cutter on the wire cutter winder 17 together with the pin groove 39 in the wire cutter winder 17.

For example, after matching the pin hole 40 in the safety plate 20 and the pin groove 39 in the wire cutter winder 17, the pin hole 40 and the pin groove 39 at this time When a pin (not shown) is inserted, the imaginary line connecting the two pin holes 40 and the wire cutter through hole 16 match, and in this state, while turning the upper case 12, the hole of the block 34 ( 31) to the imaginary line connecting the two pin holes 40, the hole 31 of the block 34 and the through-hole 16 of the wire cutter match, so that the hole 31 of the block 34 ) and the wire cutter through hole 16 to easily insert the wire cutter.

Subsequently, if the safety plate 20 and the wire cutter winder 17 fixed by the pin are turned while holding the upper case 12 by hand, the wire cutter can be easily wound around the wire cutter winder 17. there will be

Therefore, it is possible to eliminate inconveniences such as difficult fitting of the through-hole 16 of the wire cutter to the hole 31 of the block 34, which is invisible from the outside, as in the past.

In the state of having the safety plate 20 in this way, during mowing, the wire cutter performs mowing with a portion extending outward from the circumference of the safety plate 20, so even if the wire cutter breaks during mowing, the upper case ( 12), the broken part is formed on the outside, and eventually the wire cutter is broken inside the upper case 12, as in the case when there is no existing safety plate, eliminating the inconvenience of having to disassemble the entire case to replace the wire cutter be able to

In addition, the lawnmower head equipped with the safety plate includes a main locking device 21 as a means for enabling the withdrawal of the wire cutter while selectively locking or unlocking the wire cutter winder side and the lower case side.

The main locking device 21 can be engaged or released, and has a plurality of first holding jaws 21a formed on the side of the wire cutter winder 17 and a plurality of second holding jaws formed on the lower case 13 side. It consists of (21b).

The first holding jaws 21a are formed on a flat surface of the outer edge of the bottom surface of the wire cutter winder 17, that is, on the bottom surface of the winder mounting portion 30 at regular intervals (pitch) along the circumferential direction. The second locking protrusions 21b are formed at regular intervals along the circumferential direction on the plane of the inner bottom surface of the lower case 13 .

The first locking jaw 21a and the second locking jaw 21b formed in this way face each other from above and below and can be engaged or separated from each other.

For example, when the external force is not applied and the elastic force of the spring 18 is acting, the wire cutter winder 17 is positioned downward and the first locking jaw 21a and the second locking jaw 21b are mutually placed. It is engaged, and at this time, the upper and lower cases 12 and 13, the wire cutter winder 17, and the length of the wire cutter protruding out can be rotated together without pulling out the wire cutter.

In addition, in a state where an external force is acting, that is, in a state in which the worker presses the upper and lower cases 12 and 13 momentarily for about 1 to 2 seconds through the connection pipe while the safety plate 20 is applied to the ground, the upper and lower cases 12 and 13 ) moves downward, that is, as the wire cutter winder 17 is positioned relatively upward, the first catching jaw 21a and the second catching jaw 21b separate from each other, and at this time, the wire cutter that has been continuously rotating As the wire cutter wound around the wire cutter winder 17 is unwound by the inertial rotation of the winder 17, it can be drawn outside a certain length.

At this time, after pressing the upper and lower cases 12 and 13 for a while to withdraw the wire cutter to a certain length, and at the same time releasing the pressed one again, the first catching jaw 21a and the second catching jaw 21a and the second catching jaw ( 21b) is engaged again, and even at this time, the upper and lower cases 12 and 13, the wire cutter winder 17, and the length of the wire cutter in a state in which a certain length is drawn out can be rotated together without pulling out the wire cutter. do.

In particular, the first holding jaw 21a of the main locking device 21, that is, the first holding jaw 21a in the wire cutter winder 17 is tapered from one vertical surface to an inclined surface toward the other. In addition to being made of a shape, the length of the first locking jaw 21a can be made the same as the distance between the adjacent second locking jaws 21b.

Accordingly, the first locking jaw 21a is positioned snugly within the gap between the second locking jaws 21b of the lower case 13 and the second locking jaws 21b without play and is caught, and has a tapered shape. While riding over using , it is again caught in the next compartment, and eventually, the rotation of the wire cutter winder 17 for withdrawing the wire cutter can be sequentially performed exactly one step at a time without play.

In addition, the lawnmower head equipped with the safety plate includes a sub-locking device 22 as a means to prevent the wire cutter from being pulled out too much when pressed once.

The sub-locking device 22 can be engaged or released, and has a plurality of first holding jaws 22a formed on the side of the wire cutter winder 17 and a plurality of second holding jaws formed on the side of the cover 14 ( 22b).

The first locking jaws 22a are formed at regular intervals (pitch) along the circumferential direction on the plane of the upper outer surface of the wire cutter winder 17, and the second locking jaws 22b are of the cover 14. It is formed at regular intervals along the circumferential direction on the plane of the bottom outer portion.

At this time, the pitch of the first and second locking jaws 22a and 22b is relatively greater than the pitch of the first and second locking jaws 21a and 21b in the main locking device 21. Pitch, for example, can be made of about twice as large pitch.

The first locking jaw 22a and the second locking jaw 22b formed in this way face each other from above and below and can be engaged or separated from each other.

For example, in a state where the external force is not applied and the elastic force of the spring 18 is acting, the wire cutter winder 17 is positioned downward and the first locking jaw 22a and the second locking jaw 22b are mutually connected to each other. It is possible to maintain the separated state, and at this time, the upper and lower cases (12, 13) side, the wire cutter winder (17) side, and the wire cutter length part protruding out are the first locking jaw (21a) of the main locking device (21) ) and the second locking jaw 21b can be rotated together by the locking structure.

In addition, in a state where an external force is acting, that is, in a state in which the worker presses the upper and lower cases 12 and 13 momentarily for about 1 to 2 seconds through the connection pipe while the safety plate 20 is applied to the ground, the upper and lower cases 12 and 13 ) moves downward, that is, as the wire cutter winder 17 is positioned relatively upward, the first locking jaw 21a and the second locking jaw 21b separate from each other, and at the same time, the sub-locking device 22 The first locking jaw 22a and the second locking jaw 21b are engaged with each other with a time difference equal to the pitch difference between the first locking jaw 21a and the second locking jaw 21b.

That is, the point at which the first locking jaw 21a and the second locking jaw 21b of the main locking device 21 fall and the first locking jaw 22a and the second locking jaw 22b of the sub-locking device 22 ) A time difference occurs between the points of engagement, in other words, a little later after the first locking jaw 21a and the second locking jaw 21b of the main locking device 21 fall apart, The locking jaw 22a and the second locking jaw 22b are engaged, and the wire cutter is withdrawn only during this time difference, and the wire cutter is withdrawn at the moment when the first locking jaw 22a and the second locking jaw 22b are engaged. is stopped

Therefore, when the operator presses the upper and lower cases 12 and 13 with the safety plate 20 on the ground, the first locking jaw 21a and the second locking jaw 21b of the main locking device 21 fall off and continue until this time. The wire cutter wound on the wire cutter winder 17 is unwound by the inertial rotation of the wire cutter winder 17 that is rotating, allowing it to be drawn out of a certain length, even when the operator presses the safety plate 20 for a long time. Since the inertial rotation of the wire cutter winder 17 is restricted by the engaging action between the first and second locking jaws 22a and 22b of the sub-locking device 22, the wire cutter is no longer drawn out. will not be

As a result, when the wire cutter is pulled out, it is possible to prevent waste of having to cut out too many wire cutters at once, and to improve inefficiency such as work interruption.

In addition, the first holding jaw 22a of the sub-locking device 22, that is, the second holding jaw 22a in the wire cutter winder 17 extends from one vertical surface to an inclined surface toward the other. It is made in a tapered shape, and the length of the first locking jaw 22a at this time can be made the same length as the length of the first locking jaw 21a in the main locking device 21.

Accordingly, the first locking jaw 22a can move within the distance between the second locking jaw 22b and the second locking jaw 22b disposed at a large interval (pitch) of about twice. .

5 and 6 are cross-sectional views showing a state of use of a grass clipper head equipped with a safety plate according to an embodiment of the present invention.

As shown in FIG. 5, a state in which mowing is performed using a mower is shown here.

To this end, when the mower head 120 is connected to the drive shaft 100 of the mower and the mower is operated, the upper and lower cases 12 and 13 rotate, and the first locking jaw of the main locking device 21 ( 21a) and the second locking jaw 21b, the wire cutter winder 17 also rotates with the upper and lower cases 12 and 13 due to the interlocking structure, and eventually extends outward from the upper and lower cases 12 and 13. While the wire cutter 110 is rotated, grass and the like can be mowed.

During such mowing work, since the mower head 120 can be moved around while the safety plate 20 is placed on the ground, the mowing work can be conveniently performed, and the wire cutter 110 ) can be prevented from hitting soil or stones, enabling safe mowing.

As shown in Figure 6, here shows the process of pulling out the wire cutter 110 to a certain length when the length of the wire cutter 110 is shortened.

To this end, when the operator presses and releases the safety plate 20 once against the ground while the mowing machine is operating, that is, while the upper and lower covers 12 and 13 and the wire cutter 110 are rotating, the upper and lower cases ( 12 and 13) move downward, and the first locking jaw 21a and the second locking jaw 21b of the main locking device 21 are momentarily separated from each other, and in this state, the wire cutter winder that has been continuously rotating until this time As the wire cutter 110 wound around the wire cutter winder 17 is unwound by the inertial rotation of (17), a certain length (e.g., a pitch corresponding to 1 pitch where the first stopper catches the next second stopper) length) is drawn out.

Therefore, it is possible to withdraw and use the length of the wire cutter 110 as needed at that time while continuing the mowing work without stopping the mowing work, so that the mowing work can be performed quickly and conveniently.

As described above, in the present invention, by providing a mowing machine equipped with a mower head to which a safety plate capable of working against the ground surface is attached during mowing work, mowing work can be performed conveniently without effort, and mowing of a uniform height can be achieved. As a result, the quality of mowing can be improved, and workers can be safely protected by preventing the wire cutter from colliding with the ground or surrounding objects.

10: space part
11: wire cutter lead-out
12: upper case
13: lower case
14 : cover
15: wire cutter winding groove
16: wire cutter through hole
17: Wire cutter winder
18 : spring
19: Bearing
20: safety plate
21: main locking device
21a: first stumbling jaw
21b: second jaw
22: sub locking device
22a: first jaw
22b: second jaw
23: bulkhead
24: streamlined guide
25: elastic clip
26: snag piece
27: case receiving groove
28: nut member
29a, 29b: wire cutter exit
30: winder seat
31: hall
32: guide protrusion
33: guide groove
34: block
35: handle
36: spring seating plate
37: bearing receiving part
38: safety plate fixing bolt
39: pin groove
40: pin hole

Claims (7)

An upper case 12 and a lower part having a space part 10 for accommodating parts inside and a wire cutter take-out part 11 for withdrawing a wire cutter on the outer periphery, and being connected to the mower driving part to be able to rotate and move up and down at the same time case 13;
a cover 14 closing the upper portion of the lower case 13;
It is installed in a coaxial structure in the space 10 of the upper and lower cases 12 and 13 to rotate together with the upper and lower cases 12 and 13, and a wire cutter winding groove 15 for winding a wire cutter is formed on the outer circumferential surface A wire cutter winder 17 in which a wire cutter through hole 16 into which a wire cutter can be inserted is formed along the radial direction while communicating with the wire cutter winding groove 15;
A spring 18 installed between the top surface of the wire cutter winder 17 and the ceiling surface of the cover 14 inside the upper and lower cases 12 and 13 to always elastically support the wire cutter winder 17 downward ;
a safety plate 20 installed in a coaxial structure via a bearing 19 at the center of the lower surface of the wire cutter winder 17 and contacting the ground surface during mowing;
First holding jaws 21a formed at regular intervals along the circumferential direction on the plane of the outer surface of the bottom surface of the wire cutter winder 17 and along the circumferential direction on the plane of the inner bottom surface of the lower case 13 Main locking that is formed at regular intervals and consists of a first holding jaw (21a) facing each other from above and below and a second holding jaw (21b) that can be engaged, so that the upper and lower case side and the wire cutter winder side can be rotated together. device 21;
Grass trimmer head having a safety plate, characterized in that it comprises a.
The method of claim 1,
The first holding jaws 22a formed at regular intervals along the circumferential direction on the plane of the outer surface of the upper surface of the wire cutter winder 17 and the plane of the outer surface of the ceiling surface of the cover 14 are constant along the circumferential direction. A sub-locking device ( 22), and the pitch of the first locking jaw 22a and the second locking jaw 22b is of the first locking jaw 21a and the second locking jaw 21b in the main locking device 21. Grass trimmer head having a safety plate, characterized in that made of a relatively larger pitch than the pitch.
The method of claim 1,
The first locking jaw (21a) of the main locking device (21) has a tapered shape extending from a vertical surface on one side to an inclined surface toward the other.
The method of claim 2,
The first locking jaw (22a) of the sub-locking device (22) has a tapered shape extending from a vertical surface on one side to an inclined surface toward the other.
The method of claim 1,
The wire cutter winding groove 15 of the wire cutter winder 17 is divided into an upper wire cutter winding groove 15a and a lower wire cutter winding groove 15b by an intermediate partition wall 23, and the wire cutter passes through the wire cutter winding groove 15a. A grass clipper head equipped with a safety plate, characterized in that streamlined guides 24 in the shape of arcs pointing upward and downward are formed on the partition walls 23 in contact with both ends of the hole 16, respectively.
The method of claim 1,
The upper case 12 and the lower case 13 are coupled in a detachable structure by a resilient clip 25 on the upper case side and a locking piece 26 on the lower case side, which can be fastened and released from each other. Characterized in that the entire lower case 13 including the wire cutter winder 17, spring 18, cover 14 and safety plate 20 can be separated while leaving only the upper case 12 on the side. Grass trimmer head equipped with a safety plate to do.
The method of claim 1,
The safety plate 20 is made of a disc having a relatively larger diameter than the diameter of the upper and lower cases 12 and 13, and at the same time, the central portion of the disc has a case receiving groove for accommodating the upper and lower cases 12 and 13 when they move downward. A lawnmower head with a safety plate, characterized in that (27) is formed.