JPH03168017A

JPH03168017A - Lawn mower

Info

Publication number: JPH03168017A
Application number: JP30694289A
Authority: JP
Inventors: Shiro Mizobata; 溝端　史朗; Shigezaemon Iwasaki; 岩崎　重左ヱ門; Ichiro Kishi; 岸　一郎
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 1989-11-27
Filing date: 1989-11-27
Publication date: 1991-07-19
Anticipated expiration: 2013-10-15
Also published as: JP2810734B2

Abstract

PURPOSE:To enable a lawn mower to exhibit characteristics even as a battery power source type with a small driving load on a rotating blade by providing the under side of the rotating blade with an under cover equipped with comb teeth on the periphery thereof and using the head part of a mounting screw of the rotating blade as a contact part with the upper part of the under cover. CONSTITUTION:When a current is passed through a motor 10 by operating a switch handle 31 while gripping a gripping part 3 and simultaneously pressing a lock button 32 in a lawn mower, a rotating blade 11 is rotated and driven. Lawn entering a space between combs formed into the shape of comb teeth in the upper cover 5 and the lower cover 6 is cut with the rotating blade 11. At this time, since sliding load with a fixed blade is not applied to the rotation of the rotating blade 11 as opposed to a conventional mower, lawn grass cutting operation can be performed for a long period without adopting a larger-capacity battery even for a mower using battery as a power source. Since the under cover 6 is provided to protect the rotating blade 11, foreign materials are not bitten in the rotating blade 11.

Description

[Detailed description of the invention]

【Ｈコ′こ。１二力利用分野】本発明は芝刈り機、殊に家庭用の小型之刈り機に関する
ものである。[H-ko'ko. 1. Field of Application The present invention relates to a lawn mower, particularly a small mower for home use.

[Conventional technology]

このようなヱ刈り機で、回ｌＩレ，ＨＨ１４動さノしる
回転スＪを備えたものとしては、たどえは持公昭５６−
４２０１号ク〉報に示さ！したものがあるか、従来のこ
１の種の芝刈り機では、回転刃に摺接する固定刃を設けて
、回転刃と固定刃との間で芝をはさみ切りするようにな
っている。This type of mower, equipped with a rotary shaft that moves the rotation lI and HH14, dates back to the 1970s.
Shown in the 4201 issue! This type of conventional lawn mower is equipped with a fixed blade that slides against the rotating blade, and the grass is cut between the rotating blade and the fixed blade.

【発明が解決しようとする課題１この場合、回転刃と固定刃との間の摺動抵杭の関係から
、電源コードから解放された電池電源タイプとすること
は難しい。できたとしても、大容量の重い電池を搭載し
たものとなってしまい、電池電源タイプの特質を生かし
たものとすることができない。本発明はこのような点に鑑み為されたものであり、その
目的とするところは回転刃の駆動負荷が小さく、電池電
源タイプとした時もその特性を」一分に発揮することが
できる芝刈り機を提１ノ（するにある。【課題を解決するための手段】しかして本発明は、回転駆動される円板状の回転刃を備
えた芝刈り機において、回転刃の下方には周縁に櫛歯を
備えた下カハーが間隔をおいて配設され、回転刃に下方
から挿通されて回転刃を回転駆動軸に固定している取付
ねしｉ１、その頭部が上記カハーの上面との接触部とさ
れていることに特徴を有している。１作用」本発明によれば、回転刃が摺接する固定刃かないために
、駆動負荷か非常に小さいものであり、また固定刃をな
くしたことによる安全性については、回転刃の下方に間
隔をおいτ゛位置する下カハーによって維持することが
できる。［実施例］以下本発明を図示の実施例に基づいて詳述すると、この
芝刈り機は、ヘッド部１と電源部２、グリップ部３、カ
ード部４て構成されたものとなー）ている。ヘッ１・部
１は第２図に示すように、その上部内にモータ１０を内
蔵し、下面側に円板状て且つ外周縁か鋸刃状となってい
る回転刃１ｌが配されたもので、モータ１０の出力軸に
装着したビニオン１２と、回転刃■１の回転駆動軸１３
に固名されたキア１４とが噛み合うことで、モータｌＯ
の回転か回転刃１１に伝達されるようになって３いる。回転駆動軸１３への回転刃］］の収リイ」けは、
回転駆動軸１３に取付ねし１７によって固定される押え
プレー１−　１　６か、回転刃１１を回転駆動軸１３に
被せたスリーフ１５に押し付けることによってなされて
いる。そして回転刃１１の周部の」二方側には間隔をお
いて上カバー５か、下方叫には同しく間隔をおいて下カ
ハ一〇か配設されている。これら上カバー５及ひ下カハ
ー６番ま、共に外周縁に櫛歯を有している。図中６０は
−１・カバー取付ねしである。このヘッ１・部１の上部側面と千部側向とに夫々クリ・
ソア部３とガード部４の各一端かつなかー）でおり、ク
リップ部３の上面にはスライド式のスイッチハン１・ル
３１とロック釦３２とか配され、クリツフ゜部３内には
スイッチ本体３３が配されている。また力−１・部４の他端側の内部には、プレーカ４０が
配されている。電源部２は充電式電池パックとして構成されており、ク
リップ部３及びガー１・部４の他端側に連結されるもの
となっている。尚、ヘッド部１とク４リッフ゛部３及ひガーｌ・部・１の外殻は、二つ割りの
ハウシンク７によー）で一体に形成されている。以上のように形成された芝刈り機は、グリップ部３を握
るととともに、ロック釦３２を押しつー）スイ・ソチハ
ンドル３１を操作することによー）で、モータ１０に通
電させれは、モータ１０によって回転刃１１が回転駆動
され、櫛状に形成されている上カバー５と下力八−６と
におＨる櫛歯間に入った芝か回転刀ｌ１によって刈り取
られる。この時、回転刃１１の回転に対して、従来のように固定
刃との摺動負荷かかからないために、電池を電源とする
ものでも、大容量の電池を採用することなく，長時間の
芝刈り作業を行わせることができるものであり、また固
定刃かないとはいえ、下カバー６を設けて回転刃１１を
保護していることから、回転刃１■に異物が噛み込んで
しまったりすることはない。そして、回転刃１１を四転駆動軸１３に取り付けている
取付ねし１７は、その頭部が下カバー６にる゜脱自６ユ
に配した盈１つの上而に当接するようにしていることか
ら、下カバー６か不用意にたわんで回転刃ｌ１と干渉し
てしまうことはない。尚、取｛４ねじ］７と蓋１９との
接触に伴う負荷の増加は、回転駆動軸１３」二に取付ね
し］７があることから、殆ど無視することかできる。また、第５図に示すように、下カバー６／＼の取り叶け
か弾性係止によってなされている爺１９を外せば、取付
ねじ１７の頭部が露出するために、この状態で取付ねじ
１７を回すことによる回転刃１１の着脱を行うことがで
きる。更に，この芝刈り機では、重量物であるモータ１０等の
刃駆動手段を内蔵するヘット部１と、同しく重量物であ
る電源部２との間にグリップ部３か位置しており、この
ために重心かクリップ部３の近ｆＲにあり、安定した状
態で芝刈り作業を行えるものであり、またグリップ部３
の下方に空間をおいて位置しているガード部４が、グリ
ップ部３を握る手に刈芝や石等が接触することを防ぐた
めに、刈芝等で手を切ったりしてしまうということもな
い。Problem 1 to be Solved by the Invention In this case, due to the sliding resistance relationship between the rotating blade and the fixed blade, it is difficult to use a battery-powered type that is free from a power cord. Even if it were possible, it would be equipped with a large-capacity, heavy battery, and the characteristics of a battery-powered type cannot be utilized. The present invention has been made in view of these points, and its purpose is to create a lawn mower that has a small driving load on the rotary blade, and that can fully demonstrate its characteristics even when it is a battery-powered type. [Means for Solving the Problems] The present invention provides a lawn mower equipped with a disc-shaped rotary blade that is rotationally driven. A lower cage with comb teeth on the periphery is arranged at intervals, and a mounting screw i1, which is inserted into the rotary blade from below and fixes the rotary blade to the rotational drive shaft, has its head on the upper surface of the above-mentioned cage. According to the present invention, since there is no fixed blade with which the rotating blade comes into sliding contact, the driving load is very small, and the fixed blade Safety due to the elimination of the rotary blade can be maintained by a lower cover located at a distance τ' below the rotary blade. [Embodiment] The present invention will be described in detail below based on the illustrated embodiment. This lawn mower is composed of a head section 1, a power supply section 2, a grip section 3, and a card section 4. As shown in Fig. 2, the head 1/section 1 has a built-in motor 10 in its upper part, and a rotary blade 1l having a disk shape and a saw blade shape on the outer periphery is arranged on the lower surface side. The pinion 12 attached to the output shaft of the motor 10 and the rotary drive shaft 13 of the rotary blade ■1
By meshing with the Kia 14, which is named after the motor lO
The rotation of the blade is transmitted to the rotary blade 11. The rotary blade is attached to the rotary drive shaft 13.
This is accomplished by pressing the presser plate 1-16 fixed to the rotary drive shaft 13 with a screw 17 or by pressing the rotary blade 11 against a sleeve 15 placed over the rotary drive shaft 13. Upper covers 5 are disposed at intervals on both sides of the circumference of the rotary blade 11, and lower covers 10 are disposed at the same intervals on the lower side. Both the upper cover 5 and the lower cover 6 have comb teeth on their outer peripheries. In the figure, 60 is -1.No cover attached. Clear the upper side of this head 1/part 1 and the side of the head 1, respectively.
A slide-type switch handle 31 and a lock button 32 are arranged on the upper surface of the clip part 3, and a switch body 33 is located inside the clip part 3. are arranged. Further, a breaker 40 is disposed inside the other end side of the force-1 section 4. The power source section 2 is configured as a rechargeable battery pack, and is connected to the clip section 3 and the other ends of the gars 1 and 4. The outer shells of the head part 1, clip part 3, and girl part 1 are integrally formed by a housing sink 7, which is divided into two parts. In the lawn mower constructed as described above, the motor 10 is energized by gripping the grip portion 3, pressing the lock button 32, and operating the Sui-Sochi handle 31. A rotary blade 11 is rotationally driven by a rotary blade 10, and the grass that is inserted between the comb teeth of the upper cover 5 and the lower force 8-6, which are formed in a comb shape, is cut by the rotary blade l1. At this time, the rotation of the rotary blade 11 is not subject to the sliding load of the fixed blade as in the conventional case, so even if the blade is powered by a battery, it is possible to use a battery for long periods of time without using a large capacity battery. Although it is capable of mowing work and does not have a fixed blade, the lower cover 6 is provided to protect the rotary blade 11, so foreign objects may get caught in the rotary blade 1■. Never. The head of the mounting screw 17 that attaches the rotary blade 11 to the four-wheel drive shaft 13 comes into contact with the outer part of the lower cover 6. Therefore, the lower cover 6 will not inadvertently bend and interfere with the rotary blade l1. Incidentally, the increase in load due to the contact between the screw 7 and the lid 19 can be almost ignored since the rotary drive shaft 13 is mounted on the second screw 7. Furthermore, as shown in FIG. 5, if the caps 19, which are secured by the lower cover 6/\ or are elastically locked, are removed, the heads of the mounting screws 17 will be exposed. The rotary blade 11 can be attached and detached by turning 17. Furthermore, in this lawn mower, the grip section 3 is located between the head section 1, which is a heavy object, and contains blade drive means such as a motor 10, and the power supply section 2, which is also a heavy object. Therefore, the center of gravity is located near fR of the clip part 3, and mowing work can be done in a stable state.
The guard part 4, which is positioned with a space below the grip part 3, prevents grass clippings, stones, etc. from coming into contact with the hand holding the grip part 3, which may cause the hand to be cut by the grass clippings, etc. do not have.

【Effect of the invention】

以上のように本発明においては、回転刃か摺接する固定
刀かないために、駆動｛′ｔ荷が非常に小さく、従って
電池電源とした場合，大容量の電池を採用せずとも長時
間の芝刈り作業に使用することかてきるものであり、そ
して固定刃をなくしたことにＬる安全性については　回
転力のト方に間隔をおいて位置する下カバーによって維
持されるものであって、回転刃に異物か咄ｈ込むことに
よる回転刃の損傷も−「カハーによって防ぐことかでき
るものであり、史に回転刃を回転駆動軸にＪ■りイ１け
ている取付わし，の頭部を千カハーの上面に接触させる
ことで、１：゛カバーのたわみを抑制して十カハーと回
転刃との干渉を防ぐことかできるようになっているとは
いえ、この回転中心部に位置する接触部て生ずる負荷は
非常に小さく、負荷に関して問題となることはない。As described above, in the present invention, since there is no fixed knife that makes sliding contact with the rotating blade, the driving load is very small. It can be used for mowing work, and the safety that comes with eliminating the fixed blade is maintained by a lower cover located at a distance on the opposite side of the rotational force. Damage to the rotary blade due to foreign objects being bitten into the blade can also be prevented by using a "caher". By contacting the upper surface of the 1000mm cover with the upper surface of the 1000mm cover, it is possible to suppress the deflection of the cover and prevent interference between the 1000mm cover and the rotating blade. The loads generated at the contact points are very small and do not pose any load-related problems.

[Brief explanation of the drawing]

第１目は本発明一実施例の正面図、第２図は同」一の断
面図、第３図は同−１．の平而図、第４図ζま同７上の底面図、第５図は益を外した状態の断面図であ−｝
で、６は下カバー、］１は回転刃、１３は回転駆動軸、
］７は取付ねしを示す。The first is a front view of one embodiment of the present invention, the second is a sectional view of the same, and the third is a cross-sectional view of the same. Figure 4 is the same as Figure 4. The bottom view of Figure 5 is a cross-sectional view with the profit removed.
6 is the lower cover,] 1 is the rotary blade, 13 is the rotary drive shaft,
]7 indicates non-mounted.

Claims

[Claims]

(1) In a lawn mower equipped with a disc-shaped rotary blade that is rotationally driven, a lower cover with comb teeth on the periphery is disposed below the rotary blade at intervals, and the rotary blade is exposed from below. A lawn mower characterized in that the head of the mounting screw that is inserted through and fixes the rotary blade to the rotary drive shaft is in contact with the upper surface of the cover.