KR20210146510A

KR20210146510A - Combined structure of mower blade safety device

Info

Publication number: KR20210146510A
Application number: KR1020200063356A
Authority: KR
Inventors: 박정태
Original assignee: 박정태
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-12-06
Also published as: KR102425045B1

Abstract

The present invention relates to a coupling structure of a brush cutter blade safety device, which allows a brush cutter blade safety device to be installed easily, simply, inexpensively, and quickly, firmly assembles and couples components, allows anyone to safely use the same, and has excellent usability and convenience. According to the present invention, a spline shaft (31) rotating at a high speed and a fastening bolt (32) formed as a left-handed screw integrally protrude from a lower portion of a driving head unit (20). The coupling structure of a conventional brush cutter blade safety device assembles an upper sticking block (41), a blade (S), and a lower sticking block (42) on the spline shaft (31), assembles a prescribed component on the fastening bolt (32), and then fastens a bearing (200) for idling, a star-shaped safety plate (300), and a tightening nut. The bearing (200) for idling and the star-shaped safety plate (300) are assembled on a safety support shaft (100) usable as a nut and capable of simultaneously playing the role of a tightening nut pressing the lower sticking block (42) on the fastening bolt (32) to apply safety fixing power of the blade (S) and the role of a safety plate fixing shaft reliably supporting the center of a safety plate after coupling the safety support shaft (100) usable as a nut by left-handed screw fastening.

Description

Combined structure of mower blade safety device

본 발명은 예초기 칼날 안전장치을 보다 쉽고 간단하면서도 저렴하고 신속하게 설치할 수 있을 뿐만 아니라 각 부품간 조립 및 그 결합성이 견고하고 누구나 안전하게 사용할 수 있고 사용성과 편의성까지 우수한 새로운 칼날 안전장치의 결합구조에 관한 것이다.The present invention relates to a combination structure of a new blade safety device that not only makes it easier, simpler, cheaper and faster to install a blade safety device for a mower, but also has a strong assembly and combination between parts, can be used safely by anyone, and has excellent usability and convenience. will be.

통상 예초기는 집이나 논과 밭 주변이나 묘지의 벌초 작업시 널리 이용되는 잡초 절단기로, 기름을 원료로 칼날을 고속회전시키는 엔진식 예초기, 전기 배터리 를 이용하는 전동식 예초기 등이 쓰이고 있다.In general, mowers are weed cutters widely used for weeding work around houses, paddy fields, fields, or graveyards. Engine-type mowers that use oil as a raw material to rotate blades at high speed, and electric mowers using electric batteries are used.

그리고, 칼날 안전장치는 고속회전되는 칼날이 돌이나 금속과 같은 딱딱한 물질에 부딧혔을 때 칼날의 파손방지 및 칼날 또는 돌의 파편으로부터 작업자의 안전한 보호 등를 목적으로 설치되는 것으로, 현재까지 무수한 형태와 구조들이 개발 및 사용되고 있다.And, the blade safety device is installed for the purpose of preventing the damage of the blade when the high-speed rotating blade hits a hard material such as stone or metal, and to protect the operator safely from the blade or stone fragments. have been developed and used.

그 중 하나로 칼날의 하부에 별 모양의 사이 사이로 안내된 풀을 용이하게 절단하여 자를 수 있으면서도 돌, 금속 등과 같은 위험물과의 접촉은 최대한 억제할 수 있도록 함으로써 보다 안전한 예초기 사용에 도움을 주는 별모양안전판을 설치하는 예가 많다.As one of them, the star-shaped safety plate helps to use the mower safely by allowing the grass guided through the star-shaped gaps at the bottom of the blade to be easily cut and cut, while minimizing contact with dangerous objects such as stones and metals. There are many examples of installing

그러나 별모양안전판을 설치하는 기존의 칼날 안전장치는, 그 결합구조가 불필요하게 복잡하거나 제조과정의 비용이 많이 요구되는 것은 물론 사용 중 파손 또는 고장의 우려가 높고 고장 수리시 상당한 비용과 시간적 손실이 불가피하고 상용상 불편한 점도 많은 실정이다.However, the existing blade safety device that installs a star-shaped safety plate has a high risk of damage or failure during use, as well as an unnecessarily complicated coupling structure or high cost in the manufacturing process. There are also many unavoidable and commercially inconvenient points.

예를들어 공개특허 10-2013-0040443(예초기용 안전기구)는, 예초기(1)의 작업봉(2)상에 절단날(10)과 함께 장착되는 안전기구에 있어서; 상기 절단날(10)의 하부에 결합되도록 결합구(21)를 구비하고, 외주면에 방사형의 가이드(22)를 구비하는 안전판(20); 상기 절단날(10)과 안전판(20) 사이에 개재되고, 절단날(10)의 원활한 회전을 유도하는 회전수단(30); 상기 안전판(20)의 하부에 회전수단(30)과 결합되고, 안전판(20)을 지면으로부터 이격된 상태에서 미끄러짐을 유도하는 롤링수단(40); 상기 안전판(20)의 내주면에 형성되고, 회전수단(30)과 롤링수단(40)상에 이물질의 유입을 방지하는 밀폐수단(50); 상기 안전판(20)의 가이드(22)는 일단에 하나 이상의 절곡된 고정대(23)를 구비하고, 상기 고정대(23)로부터 작업봉(2)과 결합되도록 유도하면서 튐을 방지하는 보호커버(25); 상기 회전수단(30)은 절단날(10)을 밀착시켜 회전하는 회전체(31)와, 상기 안전판(20)을 고정되게 수용하는 고정체(32)와, 상기 회전체(31)와 고정체(32)의 중심에 개재되어 절단날(10)로부터 안전판(20)의 회전됨을 차단하는 베어링(35)을 구비하는 것과; 상기 롤링수단(40)은 안전판(20)과 간섭되지 않는 간격으로 회전수단(30)에 결합되는 롤링체(41)를 구비하고, 상기 회전수단(30)과 롤링체(41)의 중심에 개재되어 지면으로부터 미끄러지게 회전시키는 베어링(45)을 구비하는 것과; 상기 밀폐수단(50)은 안전판(20)의 상하면에 회전수단(30)과 롤링수단(40)을 외부로부터 밀폐되도록 다단으로 절곡된 밀폐단(51)을 구비하는 것으로 구성되어 있는데,For example, Laid-Open Patent Publication No. 10-2013-0040443 (safety mechanism for lawn mower) discloses a safety mechanism mounted together with a cutting blade 10 on the working rod 2 of the lawn mower 1; a safety plate 20 having a coupling hole 21 to be coupled to the lower portion of the cutting blade 10 and having a radial guide 22 on an outer circumferential surface; Rotating means 30 interposed between the cutting blade 10 and the safety plate 20 and inducing smooth rotation of the cutting blade 10; Rolling means 40 coupled to the rotation means 30 at the lower portion of the safety plate 20, and for inducing sliding of the safety plate 20 in a state spaced apart from the ground; a sealing means 50 formed on the inner circumferential surface of the safety plate 20 and preventing the inflow of foreign substances onto the rotating means 30 and the rolling means 40; The guide 22 of the safety plate 20 is provided with one or more bent fixing rods 23 at one end, and a protective cover 25 to prevent splashing while guiding it to be coupled with the working rod 2 from the fixing rod 23. ; The rotating means 30 includes a rotating body 31 that rotates in close contact with the cutting blade 10 , a fixed body 32 for accommodating the safety plate 20 to be fixed, and the rotating body 31 and the fixed body. and having a bearing 35 interposed in the center of 32 to block rotation of the safety plate 20 from the cutting blade 10; The rolling means 40 is provided with a rolling body 41 coupled to the rotating means 30 at intervals not interfering with the safety plate 20, and interposed in the center of the rotating means 30 and the rolling body (41). and having a bearing 45 for sliding and rotating from the ground; The sealing means 50 is configured to include a sealing end 51 bent in multiple stages so as to seal the rotating means 30 and the rolling means 40 from the outside on the upper and lower surfaces of the safety plate 20,

이는, 회전체(31)와 베어링(35)을 조립하기 위한 고정체(32)의 제조시 알루미늄이나 기타 금속재를 이용한 절삭가공을 통해 어렵고 비싸게 만들어지는 동시에 안전판과 다수의 볼트로 복잡하게 체결되어야하는 것은 물론, 특히 베어링(35)이 결합되는 구조가 불안정하고 취약하여 사용 중 파손이나 고장으로 인하여 수시로 부품을 교체해야하는 등 문제점이 있었다.This is difficult and expensive through cutting using aluminum or other metal materials when manufacturing the fixed body 32 for assembling the rotating body 31 and the bearing 35, and at the same time, it must be complicatedly fastened with a safety plate and a number of bolts. Of course, in particular, the structure to which the bearing 35 is coupled is unstable and weak, so there are problems such as frequent replacement of parts due to damage or failure during use.

뿐만 아니라 롤링수단(40)의 구성요소인 롤링체(41)의 결합구조 또한 사용 중 교체가 필요한 경우 분리,조립이 어려워 많은 시간이 걸리고 전문가의 손이 필요로 하며, 조립된 상태의 회전수단(30)과 고정체(32)와 베어링(35, 45) 내부에 이물질의 침투가 심하여 이로 인하여 고장 및 수리 또한 빈번할 수 밖에 없고, 더 나아가 안전판(22)과 작업봉(2) 사이에 불필요하게 별도의 고정대(23)와 연결대(26)를 구성하는 등 상당한 문제점이 있었다.In addition, when the coupling structure of the rolling body 41, which is a component of the rolling means 40, also needs to be replaced during use, it is difficult to separate and assemble, so it takes a lot of time and requires the hands of a professional, and the rotating means in the assembled state ( 30), the fixing body 32 and the bearings 35 and 45, the penetration of foreign substances into the interior is severe, which inevitably leads to frequent breakdowns and repairs, and furthermore, is unnecessary between the safety plate 22 and the working rod 2 . There was a significant problem, such as configuring a separate fixture (23) and connecting bar (26).

공개특허 10-2013-0040443(예초기용 안전기구)Laid-open Patent 10-2013-0040443 (Safety Mechanism for Mowers)

이에 본 발명에서는 베어링 설치구조가 최대한 간단하고 저렴하면서도 견고하고 안정적인 형태를 제공하는 동시에 안전판을 비롯한 각 부품들의 조립과 분해가 용이한 것은 물론 예초기 헤드를 지면에 닿은 상태에서 밀고 당기는 등 보다 편리하고 손쉬운 예초기 작업이 가능하고, 사용 중 지면 롤링판의 파손시 그 지면 롤링판만 간단하게 교체하면되는 등 새로운 칼날 안전장치의 결합구조를 제공함에 주안점을 두고 그 기술적과제로 완성한 것이다.Accordingly, in the present invention, the bearing installation structure is as simple and inexpensive as possible, and provides a sturdy and stable form, and at the same time, it is easy to assemble and disassemble each part including the safety plate, as well as to push and pull the mower head in contact with the ground. It was completed as a technical task with an emphasis on providing a new blade safety device coupling structure, such as mowing work possible and simply replacing the ground rolling plate when the ground rolling plate is damaged during use.

위 기술적 과제를 달성하기 위한 본 발명은 칼날(S)의 고속회전을 위한 동력수단(엔진이나 전기배터리 등)이 탑재되고, 사용자가 손으로 잡고 작업에 임할 수 있도록 하는 긴 작업봉(10)이 구성되며, 작업봉(10)의 끝단에는 기어가 내장된 구동헤드부(20)가 설치되고, 구동헤드부(20)의 하부에는 고속회전되는 스플라인축(31)과 왼나사로 형성된 체결볼트(32)가 일체로 돌출되며, 그 중 스플라인축(31)에는 상부밀착블럭(41), 칼날(S), 하부밀착블럭(42)을 각 순서대로 조립되는 통상의 예초기에 있어서, 상기 체결볼트(32)에는 하부밀착블럭(42)을 가압하여 칼날(S)의 안전하고 견고한 고정력을 인가하는 조임너트의 역할과, 안전판의 중심을 든든하게 지지하는 안전판 고정 샤프트의 역할까지 동시에 수행하는 너트겸안전지지축(100)을 체결한 다음, 그 너트겸안전지지축(100)에 공회전용 베어링(200)과 별모양안전판(3000)을 조립시켜서된 것이다.The present invention for achieving the above technical task is equipped with a power means (engine or electric battery, etc.) for high-speed rotation of the blade (S), a long working rod (10) that allows the user to hold the hand and engage in the work A driving head unit 20 having a built-in gear is installed at the end of the working rod 10, and a high-speed rotating spline shaft 31 and a left-hand screw fastening bolt 32 are formed in the lower portion of the driving head unit 20 ) protrudes integrally, and among them, the spline shaft 31 has the upper adhesion block 41, the blade S, and the lower adhesion block 42 assembled in each order in a conventional mower in which the fastening bolts 32 ), a nut and safety support shaft that simultaneously performs the role of a tightening nut that applies a safe and strong fixing force of the blade (S) by pressing the lower adhesion block (42), and a role of a safety plate fixing shaft that strongly supports the center of the safety plate. After fastening (100), the bearing 200 and the star-shaped safety plate 3000 for idling are assembled to the nut and safety support shaft 100.

이상과 같은 본 발명의 예초기 칼날 안전장치의 결합구조는, 왼나사로 이루어진 체결볼트(32)에, 하부밀착블럭(42)을 가압하여 칼날(S)의 견고하고 안전한 고정력을 인가하는 조임너트의 역할과 안전판의 중심을 든든하게 지지하는 안전판 고정 샤프트의 역할을 동시에 수행하는 너트겸안전지지축(100)을 설치한 다음 그 너트겸안전지지축(100)에 공회전용 베어링(200)과 별모양안전판(300)을 조립시키기 때문에, 구성이 매우 간단하면서도 베어링(200)과 별모양안전판(300)의 조립구조가 아주 견고할 뿐만 아니라, 너트겸안전지지축(100)와 체결볼트간 왼나사에 의한 체결로 인하여 사용 중 계속 조임현상이 발생되기 때문에 절대 풀리지도 않는 등 지극히 안전한 사용성까지 제공되는 유용한 발명이다.In the coupling structure of the blade safety device of the present invention as described above, the fastening bolt 32 made of a left screw presses the lower adhesion block 42 to apply a strong and safe fixing force of the blade S. The role of the tightening nut After installing the nut and safety support shaft 100 that simultaneously performs the role of the safety plate fixing shaft that reliably supports the center of the safety plate and the safety plate, the bearing 200 for idling and the star-shaped safety plate ( 300), the structure is very simple, and the assembly structure of the bearing 200 and the star-shaped safety plate 300 is very strong, and the fastening by the left-hand screw between the nut and safety support shaft 100 and the fastening bolt This is a useful invention that provides extremely safe usability, such as never loosening because the tightening phenomenon continues during use.

도 1은 통상 예초기 구동헤드부의 기본적인 구성을 나타낸 예시도
도 2는 예초기 구동헤드부에 본 발명의 예초기 칼날 안전장치의 결합구조가 적용되는 분해 단면도
도 3은 본 발명의 예초기 칼날 안전장치의 결합구조 전체 조립 단면도
도 4는 본 발명의 예초기 칼날 안전장치의 결합구조 일부 조립 확대 단면도
도 5는 본 발명의 너트겸안전지지축의 상세도
도 6은 본 발명의 별모양안전판의 상세도
도 7은 본 발명의 너트겸안전지지축과 베어링 홀더 및 별모양안전판의 조립상세도
도 8은 본 발명에서 제시된 스냅링 상세 및 그 조립 상태도
도 9는 본 발명에서 제시된 지면롤링부재의 상세도1 is an exemplary view showing the basic configuration of a conventional lawn mower driving head
Figure 2 is an exploded cross-sectional view to which the coupling structure of the lawn mower blade safety device of the present invention is applied to the lawn mower driving head
3 is a cross-sectional view of the entire assembly of the coupling structure of the blade safety device of the mower of the present invention;
4 is an enlarged cross-sectional view of a partial assembly of the coupling structure of the blade safety device of the mower of the present invention;
5 is a detailed view of the nut and safety support shaft of the present invention;
Figure 6 is a detailed view of the star-shaped safety plate of the present invention
7 is a detailed assembly view of the nut and safety support shaft, the bearing holder and the star-shaped safety plate of the present invention;
Figure 8 is a snap ring detail and its assembly state diagram presented in the present invention
9 is a detailed view of the ground rolling member presented in the present invention;

본 발명의 예초기 칼날 안전장치의 결합구조는 첨부된 각 도면에 의거 보다 상세히 설명하면 하기와 같다.The coupling structure of the mower blade safety device of the present invention will be described in more detail based on the accompanying drawings as follows.

즉, 본 발명은 칼날(S)의 고속회전을 위한 동력수단(엔진이나 전기배터리 등)이 탑재되고, 사용자가 손으로 잡고 작업에 임할 수 있도록 하는 긴 작업봉(10)이 구성되며, 작업봉(10)의 끝단에는 기어가 내장된 구동헤드부(20)가 설치되고, 구동헤드부(20)의 하부에는 고속회전되는 스플라인축(31)과 왼나사로 형성된 체결볼트(32)가 일체로 돌출되며, 그 중 스플라인축(31)에는 상부밀착블럭(41), 칼날(S), 하부밀착블럭(42)을 각 조립되고, 체결볼트(32)에는 소정의 부품을 조립 한 다음 공회전용 베어링(200)과 별모양안전판(300) 및 조임너트를 체결하여 구성시키는 통상의 예초기 칼날 안전장치의 결합구조에 있어서,That is, the present invention is equipped with a power means (engine or electric battery, etc.) for high-speed rotation of the blade (S), and a long working rod 10 that allows the user to hold the hand and engage in the operation is configured, the working rod At the end of (10), a driving head unit 20 having a built-in gear is installed, and a high-speed rotating spline shaft 31 and a fastening bolt 32 formed with a left-hand screw are integrally protruded from the lower portion of the driving head unit 20. Among them, the upper adhesion block 41, the blade (S), and the lower adhesion block 42 are each assembled to the spline shaft 31, and a predetermined part is assembled to the fastening bolt 32, and then the bearing for idle rotation ( 200) and the star-shaped safety plate 300 and the tightening nut in the coupling structure of a conventional mower blade safety device configured by fastening,

상기 공회전용 베어링(200)과 별모양안전판(300)은, 체결볼트(32)에 하부밀착블럭(42)을 가압하여 칼날(S)의 안전한 고정력을 인가하는 조임너트의 역할과, 안전판의 중심을 든든하게 지지하는 안전판 고정 샤프트의 역할까지 동시 수행이 가능한 너트겸안전지지축(100)을 왼나사 체결로 결합시킨 다음, 상기 너트겸안전지지축(100)에 각각 조립·구성시켜서 된 것을 그 특징적인 요지로 하였다.The bearing 200 and the star-shaped safety plate 300 for idling serve as a tightening nut to apply a safe fixing force of the blade (S) by pressing the lower adhesion block 42 to the fastening bolt 32, and the center of the safety plate Its characteristic feature is that the nut and safety support shaft 100, which can simultaneously perform even the role of the safety plate fixing shaft that reliably supports the made the gist.

위 구성 중 상기 너트겸안전지지축(100)은, 상기 체결볼트(32)에 왼나사로 체결되는 왼나사체결홈(111)이 형성되는 동시에 외측은 육각으로 이루어진 상부지지부(110)가 구성되고, 그 하부에는 베어링걸림턱(120)을 포함하는 베어링안착부(130)가 마련되며, 하부끝에는 안전판의 조립 후 이탈방지를 위하여 스냅링이 끼워질 수 있도록 하는 스냅링걸림홈(140)이 음각되는 동시에 전체적으로 일체로 제작된다.Of the above configuration, the nut and safety support shaft 100 has a left-hand thread fastening groove 111 fastened to the fastening bolt 32 with a left-hand thread, and an upper support part 110 made of a hexagon on the outside is configured, and the A bearing seating portion 130 including a bearing locking jaw 120 is provided at the lower end, and a snap ring locking groove 140 that allows a snap ring to be fitted to prevent separation after assembly of the safety plate is engraved and integrated as a whole. is made with

그리고 상기 너트겸안전지지축(100)의 베어링안착부(130)에 삽입되는 공회전용 베어링(200)은, 그 외경이 베어링 홀더(400)의 내부의 베어링포켓에 억지끼움된 상태로 안정적인 결합구조를 갖게 되는데, 이때 본원에서 제시하는 상기 베어링 홀더(400)는 절삭가공을 통하여 복잡하게 제조되는 통상의 개념과 달리 일정한 두께의 금속박판을 프레스로 가압하여 인발하는 방식으로 제조하기 때문에 그 제조 공정 및 원가를 대폭 낮출 수 있었다.And the idling bearing 200 inserted into the bearing seat 130 of the nut and safety support shaft 100 has a stable coupling structure with the outer diameter of which is pressed into the bearing pocket inside the bearing holder 400 . At this time, since the bearing holder 400 presented herein is manufactured by pressing and drawing a thin metal plate of a certain thickness with a press, unlike the conventional concept of being complicatedly manufactured through cutting, the manufacturing process and The cost could be significantly reduced.

이때 상기 베어링 홀더(400)는, 내부에 공회전용 베어링이 삽입되는 베어링포켓(410)이 형성되고, 상기 베어링포켓(410)의 일측에는 베어링삽입구(420)와 외주 둘레에 밀착날개(430)가 형성되는 반면, 반대측에는 베어링 중심을 통과한 너트겸안전지지축(100)의 끝단부 일부가 관통되는 축관통홀(440)이 천공된다.At this time, in the bearing holder 400, a bearing pocket 410 into which a bearing for idle rotation is inserted is formed, and one side of the bearing pocket 410 has a bearing insertion hole 420 and a contact wing 430 around the outer periphery. On the other hand, on the opposite side, a shaft through hole 440 through which a part of the end of the nut and safety support shaft 100 passing through the center of the bearing passes is drilled.

이러한 상기 베어링 홀더(400)는 아주 저렴하고 간단한 통상의 프레스 가공법에 의해 신속하게 제작될 수 있다.The bearing holder 400 can be manufactured quickly by a very inexpensive and simple conventional press working method.

또한 상기 베어링 홀더(400)는, 별모양안전판(300)의 중심에 별모양안전판(300)의 금속박판 살두께를 동일한 프레스로 가압법으로 쳐 올려 베어링홀더(400)의 외주둘레를 감싸면서 든든하게 지지 및 보강할 수 있도록 하는 홀더지지부재(310)를 일체로 돌출시킨 다음 그 내부에 억지끼움으로 결합시키면 많은 비용이 들어가는 NC선반 등에 의한 절삭가공법으로 제작하는 것에 비해 보다 저렴하면서도 견고하고 안정적인 베어링 및 안전판의 지지가 가능하게 된다.In addition, the bearing holder 400 raises the thickness of the thin metal plate of the star-shaped safety plate 300 in the center of the star-shaped safety plate 300 by a pressing method with the same press, while enclosing the outer periphery of the bearing holder 400 strongly. When the holder support member 310, which enables support and reinforcement, is integrally protruded and then coupled therein by force fitting, it is cheaper and more robust and stable than manufacturing by a cutting method such as an NC lathe, which costs a lot of money, and The support of the safety plate becomes possible.

또 상기 홀더지지부재(310)의 성형시 그 아래의 외측 가장자리 둘레에는 상기 베어링 홀더(400)의 밀착날개(430)가 맞춤형으로 끼워져 안착될 수 있도록 상기 밀착날개(430)의 두께과 동일한 깊이로 음각된 밀착날개안착홈(312)을 형성한 다음 거기에 밀착날개(430)을 안착시킨 상태에서 스포트용접으로 상호간 접합시키면 견고한 일체형 구조가 된다.In addition, when the holder support member 310 is molded, it is engraved with the same depth as the thickness of the contact wing 430 so that the contact wing 430 of the bearing holder 400 can be custom-fitted and seated around the outer edge below it. After forming the close contact wing seating groove 312 and then bonding to each other by spot welding in a state in which the close contact wing 430 is seated, it becomes a solid integrated structure.

한편, 상기 별모양안전판(300)은 피절단물인 풀이 절단날이 있는 내부를 향해 유입되도록 하는 다수의 풀안내홈(331)과 돌, 금속과 같은 위험물과의 접촉을 최대한 억제시키는데 역할을 하는 다수의 안전뼈대(332)가 별모양과 같이 배치된 형태로 성형되고, 그 중심에는 위 전술된 바와 같이 홀더지지부재(310)가 일체형으로 돌출된다.On the other hand, the star-shaped safety plate 300 is a plurality of pool guide grooves 331 that allow the grass to be cut to flow toward the inside with the cutting blade and a plurality of servings to suppress contact with dangerous objects such as stones and metals as much as possible. of the safety skeleton 332 is formed in a shape arranged like a star, and the holder support member 310 integrally protrudes from the center thereof, as described above.

이 역시 일정한 두께의 금속박판을 가압하여 일체형으로 만드는 프레스에 의한 방법으로 가공하면 손쉽게 제작이 가능하다.This, too, can be easily manufactured by pressing a thin metal plate of a certain thickness and processing it by a press method that makes it an integral part.

또 상기 너트겸안전지지축(100)에 공회전용 베어링(200)과 베어링 홀더(400)및 별모양안전판(300)의 조립이 끝난 후에는, 상기 스냅링걸림홈(140)에는 탈착이 용이한 스냅링(160)을 끼우게 되는데, 이때 상기 스냅링(160)에는 필요에 따라 사용자가 보다 쉽게 빼낼 수 있도록그 일측에 일정한 크기의 탈거홀(161)을 추가로 뚫어두면 편리하다.In addition, after the assembly of the idling bearing 200, the bearing holder 400, and the star-shaped safety plate 300 to the nut and safety support shaft 100 is finished, the snap ring locking groove 140 has a snap ring that is easily detachable. (160) is inserted. At this time, it is convenient to additionally drill a removal hole (161) of a certain size on one side of the snap ring (160) so that the user can take it out more easily if necessary.

나아가, 상기 별모양안전판(300)의 저면에는 예초기의 칼날(S)과 지면 사이에 어느정도 간격이 이격되어 절단되는 풀의 높이가 일정하게 유지될 수 있도록하는 동시에 무거운 예초기의 헤드부를 작업자가 힘들게 손으로 들지 않고 지면에 닿은 상태에서 미끄러지듯 이리저리 밀면서 아주 편하게 예초작업을 가능하게하는 지면롤링부재(500)를 더 설치할 수 있다.Further, on the lower surface of the star-shaped safety plate 300, a certain distance is spaced between the blade (S) of the mower and the ground so that the height of the grass to be cut can be maintained at a constant level, and at the same time, the head of the heavy mower is labored by the operator. It is possible to further install a ground rolling member 500 that enables a very comfortable mowing operation while sliding around in a state of contact with the ground without lifting it.

이때 상기 지면롤링부재(500)는, 플라스틱 사출성형에 의해 제조될 수 있고, 전체적으로 일정한 두께를 갖추면서도 뚜껑모양과 같이 원통형으로 이루어지며, 그 중 지면과 닿는 저면부에는 수평을 이루는 지면슬라이딩접촉면(510)이 마련되며, 지면슬라이딩접촉면(510) 가장자리의 상부로 원통바디(520)가 형성되고, 상기 원통바디(520)의 상측에는 다수개의 탄력걸림턱(530)을 형성하여 상기 별모양안전판(300)의 저면에 용이하게 탄력적으로 탈부착이 가능하도록 구성하였다.At this time, the ground rolling member 500 may be manufactured by plastic injection molding, and while having a constant thickness as a whole, it has a cylindrical shape like a lid, among which the ground sliding contact surface ( 510) is provided, a cylindrical body 520 is formed at the upper portion of the edge of the ground sliding contact surface 510, and a plurality of elastic locking jaws 530 are formed on the upper side of the cylindrical body 520 to form the star-shaped safety plate ( 300) to be easily and elastically attached to and detached from the bottom surface.

따라서 상기 지면롤링부재(500)가 대응되는 상기 별모양안전판(300)에는 다수개의 탄력걸림홀(540)을 뚫어서 상기 탄력걸림턱(530)간 용이한 체결이 가능하도록 하고, 상기 탄력걸림턱(530)의 양측에는 절개홈(531)을 형성하여 탄력으로 벌어졌다가 다시 원위치하는 과정에서 걸림이 이루어지도록 하며, 별모양안전판(300)으로부터 지면롤링부재(500)를 분리할 때는 탄력걸림턱(510)의 뒷쪽을 도구 등을 이용해 살짝 밀면 걸림이 해제되면서 쉽게 분리가 가능하다.Therefore, a plurality of elastic locking holes 540 are drilled in the star-shaped safety plate 300 to which the ground rolling member 500 corresponds to enable easy fastening between the elastic locking jaws 530, and the elastic locking jaw ( 530) is formed on both sides of the incision grooves 531 so as to be elastically opened and then caught in the process of returning to the original position, and when separating the ground rolling member 500 from the star-shaped safety plate 300, the elastic locking jaw ( 510) can be easily removed as the jam is released by gently pushing the back side with a tool.

상기 지면롤링부재(500)는 예초기 작업시 무거운 헤드부를 지면에 놓고 미끄러지듯 밀고 다니면서 편하게 예초작업이 가능하도록하는 이점도 있지만, 상기 베어링 홀더(400) 아래로 돌출된 너트겸안전지지축(100)의 끝단부와 거기에 꽂힌 스냅링(160) 전체를 덮어 이물질의 침투 방지에도 도움을 준다.The ground rolling member 500 also has the advantage of allowing a comfortable mowing operation by placing a heavy head on the ground and sliding it while working with the mower, but the nut and safety support shaft 100 protruding under the bearing holder 400 It also helps to prevent penetration of foreign substances by covering the end and the entire snap ring 160 inserted therein.

또 상기 베어링 홀더(400)와 하부밀착블럭(42) 사이에 위치하는 상기 너트겸안전지지축(100)의 상부지지부(110) 외측에는 스프링(171)을 게재한 다음 그 위에홀더저면막음판(180)을 구성시킴으로써, 공회전 베어링이 내장된 베어링 홀더(400) 내부로의 이물질 침투를 근본적으로 차단하였다.In addition, a spring 171 is placed on the outside of the upper support part 110 of the nut and safety support shaft 100 positioned between the bearing holder 400 and the lower adhesion block 42, and then the holder bottom blocking plate ( 180), the penetration of foreign substances into the bearing holder 400 having a built-in idle bearing is fundamentally blocked.

즉, 하부밀착블럭(42)과 너트겸안전지지축(100)을 칼날(S)과 함께 고속회전되는 것에 반해, 홀더저면막음판(180)와 접촉되는 베어링 홀더(400)는 베어링에 의한 공회전의 작용으로 인하여 비회전 상태라 마찰이 발생되어 문제가될 수 있지만, 이때 홀더저면막음판(180) 저면에 스프링(171)을 게재함에 따라 무시할 정도로 탄력적이고 유연하게 접촉하면서 이물질 침투방지기능이 이루어질 수 있게 된다.That is, in contrast to the lower adhesion block 42 and the nut and safety support shaft 100 being rotated at high speed together with the blade (S), the bearing holder 400 in contact with the holder bottom blocking plate 180 is idling by the bearing. Due to the action of the non-rotating state, friction may occur, which may cause a problem, but at this time, as the spring 171 is placed on the bottom of the holder bottom blocking plate 180, the function of preventing foreign substances from penetrating is achieved while making negligible elastic and flexible contact. be able to

S:칼날 10:작업봉
20:구동헤드부 31:스플라인축
32:체결볼트 41:상부밀착블럭
42:하부밀착블럭 100:너트겸안전지지축
200:공회전용 베어링 300:별모양안전판S: Blade 10: Work Wand
20: drive head 31: spline shaft
32: fastening bolt 41: upper adhesion block
42: lower adhesion block 100: nut and safety support shaft
200: idling bearing 300: star-shaped safety plate

Claims

A power means (engine or electric battery, etc.) for high-speed rotation of the blade (S) is mounted, and a long working rod (10) that allows the user to hold and work with his/her hand is configured, and the end of the working rod (10) A driving head unit 20 having a built-in gear is installed, and a high-speed rotating spline shaft 31 and a fastening bolt 32 formed with a left-hand screw are integrally protruded from the lower portion of the driving head unit 20, among which the spline An upper adhesion block 41, a blade (S), and a lower adhesion block 42 are each assembled to the shaft 31, and a predetermined part is assembled to the fastening bolt 32, and then the bearing 200 for idle rotation and the star shape In the coupling structure of a conventional mower blade safety device configured by fastening the safety plate 300 and the tightening nut,

The idling bearing 200 and the star-shaped safety plate 300 serve as a tightening nut to apply a safe fixing force of the blade (S) by pressing the lower adhesion block 42 to the fastening bolt 32, and the center of the safety plate. It is characterized in that the nut and safety support shaft 100, which can simultaneously perform even the role of the safety plate fixing shaft that reliably supports the Combination structure of the blade safety device of the mower.

The method of claim 1,
The nut and safety support shaft 100 is,
A left-hand screw fastening groove 111 fastened with a left-hand screw is formed on the fastening bolt 32, and an upper support part 110 made of a hexagon is configured on the outside,
A bearing seating portion 130 including a bearing engaging projection 120 is provided at a lower portion thereof,
The coupling structure of the blade safety device for mowers, characterized in that the lower end is engraved with a snap ring engaging groove 140 that allows the snap ring to be fitted to prevent separation after assembly of the safety plate.

The method of claim 1,
The bearing 200 for idle rotation inserted into the bearing seat 130 of the nut and safety support shaft 100 is,
Doedoe coupled to the inner bearing pocket 410 of the bearing holder 400,
The bearing holder 400 is
Combination structure of a blade safety device for a mower, characterized in that it is manufactured by pressing a thin metal plate of a certain thickness with a press to draw out the thickness.

The method of claim 1,
The bearing holder 400 is
A holder that supports and reinforces the outer periphery of the bearing holder 400 by hitting the flesh thickness of the thin metal plate of the star-shaped safety plate 300 in the center of the star-shaped safety plate 300 by pressing with the same press. A coupling structure of a blade safety device for a mower, characterized in that the support member 310 is integrally protruded, and then coupled therein by force fitting.

The method of claim 1,
The holder support member 310 and the star-shaped safety plate 300 are,
A coupling structure of a mower blade safety device, characterized in that it is press-fitted to the holder support member 310 and joined by spot welding between the contact blade seating groove 312 and the contact blade 430 at the same time.

The method of claim 1,
After the assembly of the idling bearing 200, the bearing holder 400, and the star-shaped safety plate 300 to the nut and safety support shaft 100 is finished, the snap ring engaging groove 140 has a snap ring 160 that is easily detachable. inserting;
The coupling structure of the blade safety device of a mower, characterized in that by additionally forming a removal hole 161 of a predetermined size so that a user can easily drop it off if necessary on one side of the snap ring 160.

The method of claim 1,
On the lower surface of the star-shaped safety plate 300,
There is a certain distance between the blade (S) of the mower and the ground, so that the height of the grass to be cut can be maintained at a constant level, while the operator does not hold the head of the heavy mower by hand and slides it while in contact with the ground. and further installing a ground rolling member 500 that allows the mowing to be carried out conveniently;

The ground rolling member 500 has a uniform thickness as a whole and has a cylindrical shape with one side blocked, and a ground sliding contact surface 510 that is horizontal is provided on the bottom part of which is in contact with the ground, and the ground sliding contact surface 510 is provided. A cylindrical body 520 is formed at the upper portion of the edge, and a plurality of elastic locking jaws 530 are formed on the upper side of the cylindrical body 520. The coupling structure of the blade safety device of a mower, characterized in that it is formed.

The method of claim 1,
In the star-shaped safety plate 300 to which the ground rolling member 500 corresponds, a plurality of elastic locking holes 540 are drilled to enable easy fastening between the elastic locking jaws 530, and the elastic locking jaws ( The coupling structure of the blade safety device of a mower, characterized in that by forming cut-out grooves 531 on both sides of the 530) to allow it to be caught in the process of resiliently opening and returning to its original position.

Outside the upper support part 110 of the nut and safety support shaft 100 positioned between the bearing holder 400 and the lower adhesion block 42,
The coupling structure of the blade safety device of a mower, characterized in that the spring 171 is placed and then the holder bottom blocking plate 180 is configured on it to prevent the penetration of foreign substances into the bearing holder 400 .