JPH11285917A - Power driven cutting tool - Google Patents

Power driven cutting tool

Info

Publication number
JPH11285917A
JPH11285917A JP9195298A JP9195298A JPH11285917A JP H11285917 A JPH11285917 A JP H11285917A JP 9195298 A JP9195298 A JP 9195298A JP 9195298 A JP9195298 A JP 9195298A JP H11285917 A JPH11285917 A JP H11285917A
Authority
JP
Japan
Prior art keywords
cutting blade
cutting
guard
fixed
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9195298A
Other languages
Japanese (ja)
Other versions
JP3726482B2 (en
Inventor
Tomoumi Yoshimizu
智海 吉水
Hiroyuki Oda
裕幸 尾田
Eiji Nakayama
栄二 中山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP09195298A priority Critical patent/JP3726482B2/en
Publication of JPH11285917A publication Critical patent/JPH11285917A/en
Application granted granted Critical
Publication of JP3726482B2 publication Critical patent/JP3726482B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Shearing Machines (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a long-life inexpensive power-driven cutting tool by improving safety in case of abnormal operation. SOLUTION: A shaft 101 is arranged in an oscillation arm 10, and a rotational cutter guard 104 is arranged beside a cutting blade so as to be energized by a spring. A clearance M is arranged beside the cutting blade in a fixing member 8, and a dust guard 110 is arranged in the clearance M. In front of a fixed cutting blade 12b, the dust guard 110 is arranged so as to seal a gap, while hollow parts 110a, 110b are formed in the dust guard 110.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は住宅やビルの建築、
外構、土木工事等において、鉄筋、パイプ材等の棒状の
被加工材を任意の長さに切断する電動式切断工具に関す
るものである。以下直径13mmの鉄筋を切断及び曲げ
る電動式切断曲げ工具を例に挙げて説明する。
The present invention relates to the construction of houses and buildings,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric cutting tool for cutting a rod-shaped workpiece such as a reinforcing bar or a pipe into an arbitrary length in an external construction, civil engineering work, or the like. Hereinafter, an electric cutting and bending tool for cutting and bending a reinforcing bar having a diameter of 13 mm will be described as an example.

【0002】[0002]

【従来の技術】鉄筋を切断する及び曲げる切断曲げ工具
として、本出願人が先に出願した特願平8−32814
4号がある。これは図1に示す如く、出力軸4に一体ま
たは別体で形成されたカム11、揺腕10、可動切断刃
12a及び固定切断刃12bからなる一対の切断刃12
等構成される切断機構部が減速部3の上方に配置されて
いる。図10に示す如く、切断機構部には揺腕従動節が
用いられ、ギヤカバー2に装着された固定部材8、固定
部材8に圧入された支軸9、支軸9に回動可能に取り付
けられた揺腕10、出力軸4と一体に形成されたカム1
1等から構成されている。固定部材8及び揺腕10の各
々の相対向する端部には固定切断刃12b及び可動切断刃
12aからなる一対の切断刃12が装着されている。カ
ム11の回転により揺腕10が支軸9を中心に上下に揺
動し、一対の切断刃12の間の鉄筋26を剪断により切
断する。
2. Description of the Related Art As a cutting and bending tool for cutting and bending a reinforcing bar, Japanese Patent Application No. 8-32814 filed earlier by the present applicant.
There is No. 4. As shown in FIG. 1, a pair of cutting blades 12 composed of a cam 11, a swing arm 10, a movable cutting blade 12a and a fixed cutting blade 12b formed integrally with or separately from the output shaft 4.
A cutting mechanism having the same configuration is arranged above the speed reduction unit 3. As shown in FIG. 10, a rocking arm follower is used for the cutting mechanism, and a fixed member 8 attached to the gear cover 2, a support shaft 9 pressed into the fixed member 8, and rotatably mounted on the support shaft 9. The cam 1 formed integrally with the swing arm 10 and the output shaft 4
1 and so on. A pair of cutting blades 12 each composed of a fixed cutting blade 12b and a movable cutting blade 12a are mounted on opposite ends of the fixed member 8 and the swing arm 10, respectively. The swing arm 10 swings up and down around the support shaft 9 by the rotation of the cam 11, and cuts the reinforcing bar 26 between the pair of cutting blades 12 by shearing.

【0003】[0003]

【発明が解決しようとする課題】上記した切断曲げ工具
には次のような課題があった。 (1) 操作者が誤って通常の鉄筋ではなく用途外の異常
に硬い棒材を切断しようとした場合、電動機がロックす
るまで荷重が作用すれば、通常の約3倍程の荷重が作用
し、切断刃が割れる恐れがある。割れた場合これが揺腕
10の被切断材挿入方向に飛散し、周囲を汚す恐れがあ
った。
The cutting and bending tool described above has the following problems. (1) If the operator mistakenly cuts an unusually hard bar outside of the application instead of a normal reinforcing bar, if the load is applied until the motor locks, approximately 3 times the normal load will be applied. , The cutting blade may be cracked. If it breaks, it may scatter in the rocking arm 10 in the direction in which the material to be cut is inserted, and contaminate the surroundings.

【0004】(2) 飛散防止のために切断刃12のすぐ
脇にガード壁を設けることはできるが、操作者が通常の
鉄筋を切断中に誤って切断刃12の刃部からはみ出した
状態で切断した場合、はみ出した鉄筋がガード壁を潰し
て破損する恐れがあった。
(2) A guard wall can be provided immediately beside the cutting blade 12 to prevent scattering. However, in a state where an operator accidentally protrudes from the blade portion of the cutting blade 12 while cutting a normal reinforcing bar. If cut, the protruding rebar might crush the guard wall and break it.

【0005】(3) 固定切断刃12bは動かないが可動
切断刃12aは揺腕10と共に動くため、動く部材に追
従するガード壁が必要になる。
(3) The fixed cutting blade 12b does not move, but the movable cutting blade 12a moves together with the swing arm 10, so that a guard wall is required to follow the moving member.

【0006】(4) 固定部材8と天板5の間には揺腕1
0の厚み分隙間があり、ここから工具内部に切断時発生
する鉄筋の鉄粉(スケール)が侵入しカム11の摩耗等
工具の故障の原因になる。
(4) The swing arm 1 is provided between the fixing member 8 and the top plate 5.
There is a gap corresponding to a thickness of 0, and iron powder (scale) of a reinforcing bar generated at the time of cutting enters the inside of the tool from there, and causes a tool failure such as abrasion of the cam 11.

【0007】(5) 上記対策のため、別部材でシールす
ることも考えられるが、もし、操作者が10〜20mm
程度に短く鉄筋を切断した場合、この短い鉄筋片がシー
ル材の上に乗って残ってしまう。このままの状態で次の
鉄筋を切断しようとした場合、剪断で押された鉄筋が前
にシール材の上に残っている鉄筋を押しつぶし、シール
材も押しつぶし破損してしまう。
(5) For the above measures, it is conceivable to seal with a separate member, but if the operator is
If the rebar is cut so short, the short rebar piece will remain on the sealing material. If an attempt is made to cut the next reinforcing bar in this state, the reinforcing bar pressed by shearing crushes the reinforcing bar remaining on the sealing material, and the sealing material is crushed and damaged.

【0008】本発明の目的は、上記した電動式切断工具
の欠点を解消し、安価、軽量で操作性、組立性、寿命、
安全性の向上を図った電動式切断工具を提供することで
ある。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the electric cutting tool.
An object of the present invention is to provide an electric cutting tool with improved safety.

【0009】[0009]

【課題を解決するための手段】上記した目的は次のよう
にして達成される。以下上記課題の順に説明する。 (1) 切断刃の万一の割れによる飛散の対策としては、
切断刃の飛散方向にガード壁を設け、回動可能にすれば
良い。
The above-mentioned object is achieved as follows. Hereinafter, the problems will be described in order. (1) As a countermeasure against scattering due to an unexpected crack of the cutting blade,
What is necessary is just to provide a guard wall in the scattering direction of the cutting blade so as to be rotatable.

【0010】(2) ガード壁と切断刃の間に適度な空隙
を設け、弾性部材を配することでも、同様である。
(2) The same applies to providing an appropriate gap between the guard wall and the cutting blade and disposing an elastic member.

【0011】(3) ガード壁を薄板の鉄板製にし、動く
揺腕にガード壁の軸となるシャフトを取付け、回動可能
に一体に動くように形成すれば良い。
(3) The guard wall may be made of a thin iron plate, and a shaft serving as the axis of the guard wall may be attached to the movable rocking arm so that the guard wall can move integrally with the arm.

【0012】(4) ゴム等の弾性部材で形成すると共に
その内部に空洞部を設けたシール材を固定切断刃と天板
の間にシール材として配すれば良い。
(4) A sealing material formed of an elastic member such as rubber and having a cavity therein may be disposed as a sealing material between the fixed cutting blade and the top plate.

【0013】[0013]

【発明の実施の形態】以下本発明を一実施形態を示した
図1〜図12を参照して説明する。 (全体配置の説明)図1において、電動機1は樹脂製の
ハウジング6に内蔵され、後述する天板5の横に配置さ
れている。この部分を以下動力部という。ハウジング6
を挾んで天板5の反対側に、ハンドル53、コード55
が配置され、ハンドル53内には電動機1の給電回路を
開閉するスイッチ54及び図示しないコントローラ、角
度設定回路等が収納されている。以下この部分を電源部
という。電動機1の回転を約1/1000に減速する平
歯車からなる4段の歯車列3a〜3gがアルミダイキャ
スト製のギヤカバー2に内蔵されている。出力軸4は下
端を軸受56、中央部を固定部材8の軸受部8a及び上
端を後述するセンタプレート15の円筒部15aの3点
で支持されている。以下この部分を減速部3という。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. (Explanation of Overall Arrangement) In FIG. 1, the electric motor 1 is built in a housing 6 made of resin and arranged beside a top plate 5 described later. This part is hereinafter referred to as a power part. Housing 6
Handle 53 and cord 55 on the opposite side of the top plate 5
The switch 53 for opening and closing the power supply circuit of the electric motor 1, a controller (not shown), an angle setting circuit, and the like are housed in the handle 53. Hereinafter, this part is referred to as a power supply part. Four-stage gear trains 3a to 3g composed of spur gears for reducing the rotation of the electric motor 1 to about 1/1000 are built in the aluminum die-cast gear cover 2. The lower end of the output shaft 4 is supported by the bearing 56, the center is supported by the bearing 8 a of the fixing member 8, and the upper end is supported by the cylindrical portion 15 a of the center plate 15 described later. Hereinafter, this portion is referred to as a reduction portion 3.

【0014】(切断機構部)減速部3の上側には出力軸
4に一体または別体で形成されたカム11、揺腕10、
可動切断刃12a及び固定切断刃12bからなる一対の
切断刃12から構成される切断機構部が配置されてい
る。 図10において、切断機構部には揺腕従動節が用いら
れ、ギヤカバー2に装着された固定部材8、固定部材8
に圧入された支軸9、支軸9に回動可能に取り付けられ
た揺腕10、出力軸4と一体に形成されたカム11等か
ら構成されている。固定部材8及び揺腕10の各々の相
対向する端部には固定切断刃12b及び可動切断刃12
aからなる一対の切断刃12が装着されている。
(Cuting Mechanism) On the upper side of the speed reducer 3, a cam 11, a swing arm 10 formed integrally with or separately from the output shaft 4,
A cutting mechanism unit including a pair of cutting blades 12 including a movable cutting blade 12a and a fixed cutting blade 12b is arranged. In FIG. 10, a rocking arm follower is used for the cutting mechanism, and a fixing member 8 attached to the gear cover 2,
A shaft 9 is press-fitted into the shaft, a swing arm 10 rotatably attached to the shaft 9, a cam 11 integrally formed with the output shaft 4, and the like. A fixed cutting blade 12b and a movable cutting blade 12b are provided at opposite ends of the fixed member 8 and the swing arm 10, respectively.
a is mounted.

【0015】(曲げ機構部)図1において、切断機構部
の上側には天板5や円板19を挟み込んだ形でセンタプ
レート15、曲げピン13、曲げローラ14からなる曲
げ機構部が配置されている。カム11には出力軸4から
偏心した位置に曲げピン13が圧入されており、曲げピ
ン13には曲げローラ14が回転可能に装着され、止め
ワッシャにより抜け止めされている。センタプレート1
5は、図2、に示すように、出力軸4と支軸9が夫々貫
通する穴を有し、出力軸4のカム11及び支軸9の揺腕
10は固定部材8とセンタプレート15により夫々両端
支持された配置になっている。出力軸4に嵌合した円筒
部15aは高さが鉄筋径の2倍(約25mm)、外径が
鉄筋26の曲げRの大きさ(約28mm)の筒型をして
おり、鉄筋曲げ時の中心となる。受け部15bは、支軸
9の近くに一体で形成され、曲げ時の反力受けとなる。
(Bending Mechanism) In FIG. 1, a bending mechanism comprising a center plate 15, bending pins 13, and bending rollers 14 is disposed above the cutting mechanism with a top plate 5 and a circular plate 19 interposed therebetween. ing. A bending pin 13 is press-fitted into the cam 11 at a position eccentric from the output shaft 4, and a bending roller 14 is rotatably mounted on the bending pin 13 and is prevented from coming off by a stop washer. Center plate 1
5 has a hole through which the output shaft 4 and the support shaft 9 respectively penetrate, and the cam 11 of the output shaft 4 and the swing arm 10 of the support shaft 9 are fixed by the fixing member 8 and the center plate 15. Each is supported at both ends. The cylindrical portion 15a fitted to the output shaft 4 has a cylindrical shape with a height twice (about 25 mm) the rebar diameter and an outer diameter of the bending R of the rebar 26 (about 28 mm). Be the center of The receiving portion 15b is integrally formed near the support shaft 9 and serves as a reaction force receiving at the time of bending.

【0016】(カッターガード部)ここで、本発明の揺
腕10に設けられた安全機構について図3及び図4で説
明する。 揺腕10に取り付けられたシャフト101には、捩りコ
イルばね103と鉄板を折り曲げて作られたカッタガー
ド104が挿入され、、シャフト101はトメワ102を
介して揺腕10に固定されている。カッタガード104
は捩りコイルばね103で付勢されながらシャフト10
1に対し回動可能である。カッタガード104のシャフ
ト挿入部とは反対側他端はコの字形104aに折り曲げ
られ、可動切断刃12aを包むようにしている。コの字形
折り曲げ部104aの点Pはシャフト101から距離L
離れ、捩りコイルばね103は図3中揺腕10が矢印方
向に動かされた時カッタガード104を戻る方向すなわ
ち反時計方向に付勢している。 図5、図6において、固定部材8の固定切断刃12bの
側面には、固定切断刃12bとの間に5mm程度(鉄筋
径の約1/3〜1/1の距離M)の距離を開けて、固定
切断刃12bとほぼ同じ高さまでギヤカバー2のアルミ
壁2aが設けられている。固定切断刃12bの前方には、
固定切断刃12bの刃部から15mm程下方にゴム製の
ダストガード110が設けられている。ダストガード1
10は、図9に示す如く、空洞部110a、110bが
設けられ、5〜10mm押しても弾性変形可能であり復
元できる。ダストガード110の一部分は固定切断刃1
2bとアルミ壁2aの間の前記5mm程の隙間Mに挟み
込んだ部分が形成されている。これをダンパ部110d
という。支軸9との接触面には凹凸のリップをもつシー
ル部110cが形成されている。固定切断刃12bの図
中手前側には、フランジ部110eが形成されている。
なお、これら揺腕10、カッタガード104、シャフト1
01等は、前記ギヤカバー2と天板5に囲まれ外部に露
出していない。天板5には15mm×15mm程度の切
欠け窓5bが固定切断刃12bの手前に設けられ、前記
ダストガード110の一部で塞いでいる。
(Cutter Guard) A safety mechanism provided on the swing arm 10 of the present invention will be described with reference to FIGS. 3 and 4. FIG. A torsion coil spring 103 and a cutter guard 104 formed by bending an iron plate are inserted into a shaft 101 attached to the rocking arm 10, and the shaft 101 is fixed to the rocking arm 10 via a tome 102. Cutter guard 104
The shaft 10 is urged by the torsion coil spring 103.
1 is rotatable. The other end of the cutter guard 104 opposite to the shaft insertion portion is bent into a U-shape 104a so as to wrap the movable cutting blade 12a. The point P of the U-shaped bent portion 104a is a distance L from the shaft 101.
The torsion coil spring 103 urges the cutter guard 104 in the returning direction, that is, in the counterclockwise direction when the swing arm 10 is moved in the direction of the arrow in FIG. 5 and 6, a distance of about 5 mm (a distance M of about 1/3 to 1/1 of the rebar diameter) is provided on the side surface of the fixed cutting blade 12b of the fixed member 8 between the fixed cutting blade 12b and the fixed cutting blade 12b. Thus, the aluminum wall 2a of the gear cover 2 is provided to substantially the same height as the fixed cutting blade 12b. In front of the fixed cutting blade 12b,
A rubber dust guard 110 is provided about 15 mm below the blade portion of the fixed cutting blade 12b. Dust guard 1
As shown in FIG. 9, the cavity 10 is provided with cavities 110a and 110b, and can be elastically deformed and restored when pressed by 5 to 10 mm. Part of the dust guard 110 is a fixed cutting blade 1
A portion sandwiched by the gap M of about 5 mm between the aluminum wall 2a and the aluminum wall 2a is formed. This is the damper part 110d
That. On the contact surface with the support shaft 9, a seal portion 110c having an uneven lip is formed. A flange 110e is formed on the front side of the fixed cutting blade 12b in the drawing.
The rocking arm 10, cutter guard 104, shaft 1
01 and the like are surrounded by the gear cover 2 and the top plate 5 and are not exposed to the outside. A cutout window 5b of about 15 mm × 15 mm is provided in the top plate 5 in front of the fixed cutting blade 12b, and is closed by a part of the dust guard 110.

【0017】次に本発明切断曲げ工具の動作について説
明する。 (切断の場合)鉄筋26を切断する場合は、図11に示
す如く、工具を図2の下側を地面に向けた状態すなわち
切断刃12が上に位置するように地面に置く。次にレバ
ー22を図2の黒矢印方向に動かし、安全カバー21を
天板5内へ引込んで切断刃12を露出させる。この状態
で切断する鉄筋26を固定切断刃12bの刃部に載せ
る。
Next, the operation of the cutting and bending tool of the present invention will be described. (Cuting) When cutting the reinforcing bar 26, as shown in FIG. 11, the tool is placed on the ground with the lower side of FIG. 2 facing the ground, that is, the cutting blade 12 is positioned above. Next, the lever 22 is moved in the direction of the black arrow in FIG. 2, and the safety cover 21 is pulled into the top plate 5 to expose the cutting blade 12. The reinforcing bar 26 to be cut in this state is placed on the blade portion of the fixed cutting blade 12b.

【0018】図1のコード55を電源へつなぎハンドル
53を握りスイッチ54を入れると、電動機1は約18
000rpmで高速回転する。回転軸7aの回転は4段
の平歯車列3a〜3gで約1/1000の18rpmに
減速され、出力軸4に伝達される。出力軸4には扇状の
カム11が一体で刻設され、支軸9に揺動可能に取り付
けられた揺腕10の一端のローラ60がカム11に接触
しているので、出力軸4の回転に伴ってローラ60が押
し上げられ、可動切断刃は支軸9を中心に下向きに回転
し、約6000kgの切断力で鉄筋26を剪断する。
When the cord 55 of FIG. 1 is connected to a power source, the handle 53 is grasped and the switch 54 is turned on, the motor 1
High speed rotation at 000 rpm. The rotation of the rotation shaft 7a is reduced to about 1/1000 of 18 rpm by the four-stage spur gear trains 3a to 3g and transmitted to the output shaft 4. A fan-shaped cam 11 is integrally formed on the output shaft 4, and the roller 60 at one end of a swing arm 10 slidably attached to the support shaft 9 is in contact with the cam 11. As a result, the roller 60 is pushed up, and the movable cutting blade rotates downward around the support shaft 9 to shear the reinforcing bar 26 with a cutting force of about 6000 kg.

【0019】(可動切断刃12aの安全装置の動作)以
上は通常の使い方であるが、切断刃12はJIS等の規
格に定められた硬度が普通の鉄筋(引張強さ60kg/mm
2)を切った場合は問題無いが、それよりも硬度の硬い
焼入鋼(例えば引張強さ120kg/mm2)を切ったりし
た場合等、図7のに示す如く万一の場合、切断刃12が真
っ二つに割れて破片12a−1が鉄筋挿入方向(図中矢
印のx方向)に飛散する場合も想定される。その際、前記
カッタガード104は可動切断刃12aをコの字に囲む
様に取り付けられているので、破片12a−1が飛び出
すことがなく安全である。また、可動切断刃12aが割れ
ることで、二つに成った切断刃12aの間に硬い棒材1
08が入り込むと図7のように切断刃破片12a−1は
カッタガード104を押し出す方向に力が作用するが、
カッタカード104は前記シャフト101を中心に回動
可能に取り付けられ、可動切断刃12aがカッタガード
104と接触する点Pよりもシャフト101の位置は距
離L分上方にあるので、カッタガード104は上方向に
回動する力(モーメント=押し出す力×距離L)が発生
し、わずかに逃げる。そして、破片12a−1はある程度
動いたところで棒材108とコの字部104aの間に挟
まって止まり飛散は防止される。また、カッタガード1
04はコの字形に折り曲げたバネ鋼で形成されているの
で、ある程度の変形は持ちこたえ復元可能である。この
ためカッタガード104の永久変形は防げる。また図8
のように、もし、操作者が通常の鉄筋26を切断する際に
誤って通常の切断位置から外れた位置(図中右方向)に
鉄筋26をセットして切断しようとした場合、切り残さ
れた半分の鉄筋がカッタガード104aにぶつかり、カ
ッタガードに揺動方向(図中実線矢印y方向)に無理な
力が作用し変形してしまう場合もある。その際は、カッタ
ガード104は揺腕10のシャフト101を支点に回動
可能なため、図中点線矢印方向に揺動し逃げるので、変形
せずにすむ。また、力が解除されればねじりコイルばね1
03の復元力で元に戻るので、次の作業時も今までどお
り使える。また、可動切断刃12aはコの字部で挟まれて
いるので、天板5と反対方向に発生する飛散も防げる。ま
た、カッタガード104は薄板の鉄板のため、切断刃1
2の側方に2〜3mm程度のスペースしか必要が無い。
(Operation of the safety device of the movable cutting blade 12a) Although the above is a normal use, the cutting blade 12 has a normal reinforcing steel (tensile strength of 60 kg / mm) specified in the standards such as JIS.
There is no problem if the cutting blade 2) is cut, but if the hardened steel having a higher hardness (for example, a tensile strength of 120 kg / mm2) is cut or the like, as shown in FIG. May be broken into two pieces and the fragments 12a-1 may be scattered in the direction in which the rebar is inserted (in the direction indicated by the arrow x in the figure). At this time, since the cutter guard 104 is attached so as to surround the movable cutting blade 12a in a U-shape, the fragments 12a-1 do not fly out and are safe. In addition, the movable cutting blade 12a is cracked, so that a hard bar 1 is placed between the two cutting blades 12a.
When 08 enters, a force acts in the direction in which the cutting blade fragment 12a-1 pushes out the cutter guard 104 as shown in FIG.
The cutter card 104 is rotatably mounted around the shaft 101, and the position of the shaft 101 is above the point P where the movable cutting blade 12a contacts the cutter guard 104 by the distance L. A force that pivots in the direction (moment = pushing force x distance L) is generated and slightly escapes. When the pieces 12a-1 have moved to some extent, they are stopped between the bar member 108 and the U-shaped portion 104a and are prevented from scattering. Also, cutter guard 1
Since 04 is formed of spring steel bent in a U-shape, it can withstand a certain degree of deformation and can be restored. Therefore, permanent deformation of the cutter guard 104 can be prevented. FIG.
If the operator mistakenly sets the rebar 26 at a position deviated from the normal cutting position (rightward in the figure) when cutting the normal rebar 26, the operator is left uncut. In some cases, the rebar may hit the cutter guard 104a and an excessive force may act on the cutter guard in the swinging direction (the direction of the solid arrow y in the drawing) to deform the cutter guard. In this case, since the cutter guard 104 can rotate about the shaft 101 of the swing arm 10 as a fulcrum, the cutter guard 104 swings and escapes in a direction indicated by a dotted line in FIG. When the force is released, the torsion coil spring 1
Since it returns to its original state with the restoring power of 03, it can be used for the next work as before. In addition, since the movable cutting blade 12a is sandwiched between the U-shaped portions, scattering that occurs in the direction opposite to the top plate 5 can be prevented. Since the cutter guard 104 is a thin iron plate, the cutting blade 1
Only the space of about 2 to 3 mm is required on the side of 2.

【0020】揺腕10は可動のため後述の「ゴム+アル
ミ壁」方式のように寸法が大きいと鉄筋26の装着時刃
部が見にくなるがカッタガード104はスペース的に有
利である。
Since the swing arm 10 is movable, if the size is large as in the "rubber + aluminum wall" system described later, the blade portion becomes difficult to see when the reinforcing bar 26 is mounted, but the cutter guard 104 is advantageous in terms of space.

【0021】(固定切断刃12bの安全装置の動作)上
記同様に操作者が誤って用途外の硬い鋼材108を切ろ
うとした場合、固定切断刃12bも図7のように同様に
割れる恐れがある。固定切断刃12bが割れることで、二
つに成った切断刃12bの間に硬い棒材108が入り込
むと図7のように切断刃破片12b−1には押し出され
る方向に力が作用するが、アルミ壁2aと固定切断刃1
2bの間に棒材径の1/3〜1/1の隙間Mがあるの
で、アルミ壁2aの変形は防げる。また、この隙間Mには
前記ダストガード110のダンパ部110dがあるの
で、切断刃破片12b−1が押し付けられても、弾性変形
しながら飛散を防止できる。ダンパ部110dはアルミ
壁2aに支えられある一定以上の変形はできないので、
切断片12b−1の飛散は防げる。 また、もし、図8のように、操作者が通常の鉄筋26を切
断する際に誤って、通常の切断位置から外れた位置に鉄
筋26をセットして切断しようとした場合、切り残され
た半分の鉄筋がアルミ壁2aにぶつかり、アルミ壁2a
を揺動方向に無理な力が作用し変形してしまう場合もあ
る。しかし、固定切断刃12bとアルミ壁2aの間の鉄筋
径の5mm程度の隙間Mには切り残った鉄筋は入り込む
がそれ以上ははみ出さないので、アルミ壁2aの変形は
防げる。まだ、間のダンパ部110dはゴム材等の弾性体
なので鉄筋26でつぶされても元に戻り、次の仕事に支
障は無い。また、固定切断刃12bの天板5の方向にもフ
ランジ部110eがあり、5mm程度固定切断刃12b
にかぶっているので、天板5方向に発生する飛散も防げ
る。 なお本方式は、本来在るギヤカバー2のアルミ部材の一
部を利用して型で一体に成形可能であり、また、間にゴ
ム材を入れるだけで形成できるので、前記カッタガード
104よりも切断刃側方のスペースは必要になるが、コ
スト的には非常に安くできる。なお、「カッタガード1
04のような回動する鉄板製ガードによる飛散防止」と
「ダストガード110+アルミ壁2aのような飛散防
止」の2つの方法は揺腕10と固定部材8に対してどち
らを使っても、組み合わせて使っても、あるいは逆につ
けても、一長一短はあるが飛散や破損に対する効果が同
じことは言うまでも無い。
(Operation of Safety Device for Fixed Cutting Blade 12b) As described above, if the operator mistakenly tries to cut the hard steel material 108 that is not used, the fixed cutting blade 12b may be similarly broken as shown in FIG. . When the fixed cutting blade 12b is cracked and the hard bar material 108 enters between the two cutting blades 12b, a force acts on the cutting blade fragment 12b-1 in the direction of being pushed out as shown in FIG. Aluminum wall 2a and fixed cutting blade 1
Since there is a gap M between 1/3 and 1/1 of the rod diameter between the two walls 2b, deformation of the aluminum wall 2a can be prevented. Further, since the damper portion 110d of the dust guard 110 is provided in the gap M, even if the cutting blade fragment 12b-1 is pressed, it can be prevented from scattering while being elastically deformed. Since the damper portion 110d is supported by the aluminum wall 2a and cannot be deformed beyond a certain level,
Scattering of the cut piece 12b-1 can be prevented. Also, as shown in FIG. 8, if the operator mistakenly sets the reinforcing bar 26 at a position deviating from the normal cutting position when cutting the normal reinforcing bar 26, the operator is left uncut. Half of the rebar hits the aluminum wall 2a and the aluminum wall 2a
May be deformed due to excessive force acting in the swinging direction. However, the remaining reinforcing bar enters the gap M having a diameter of the reinforcing bar of about 5 mm between the fixed cutting blade 12b and the aluminum wall 2a, but does not protrude any further, so that the deformation of the aluminum wall 2a can be prevented. Still, since the interposed damper portion 110d is an elastic body such as a rubber material, even if it is crushed by the reinforcing bar 26, it returns to its original state and does not hinder the next work. In addition, the fixed cutting blade 12b has a flange portion 110e also in the direction of the top plate 5 and has a fixed cutting blade 12b of about 5 mm.
Since it is covered, the scattering generated in the direction of the top plate 5 can be prevented. In addition, this method can be integrally formed with a mold by using a part of the aluminum member of the gear cover 2 which is originally present, and can be formed only by inserting a rubber material therebetween. Space is needed beside the blade, but it can be very cheap in terms of cost. In addition, "Cutter guard 1
The two methods of "prevention of scattering by rotating iron plate guard such as 04" and "prevention of scattering such as dust guard 110 + aluminum wall 2a" can be combined by using either of the swing arm 10 and the fixing member 8. It does not matter if it is used or vice versa, it has the advantages and disadvantages, but the same effect on scattering and damage.

【0022】(ダストガード)図9に示すように、固定
部材8と天板5(図6参照)の間には、前記揺腕10の
厚み分の約25mm程度の隙間Q(図6参照)がある。
鉄筋26を切断した際に発生するスケール(切粉)はこ
の隙間から内部のカム11部等に入ろうとするが、これ
を防ぐためダストガード110がある。これは上記のよ
うにゴム製で弾力があるため天板5や固定部材8、ギヤ
カバー2に密着し、切粉の進入を防ぐ。ただ、もし、操作者
が鉄筋26を10〜20mm度に短く切った場合、この
小さな切断片26bは図9ののように、ダストガード1
10の上に乗ってしまう。この場合、鉄筋26の直径は1
3mmほどあるので、乗ったまま次の鉄筋26aを切る
とその鉄筋26aが前記ダストガード110上の切断片
26bを押し付け、ダストガード110を天板5の中に
押し込もうとする。しかし、ダストガード110は内部に
空洞部110aがあるため、図9のように大きく変形す
ることが可能であり、押し込まれても破損することはな
い。この空洞部110aの幅N(図5)は本実施形態で
は直径13mmの鉄筋26に対し10mm程度とってい
る。また、これは、中空のゴムでなくとも、板をバネで移動
可能にするなど大きく変形できる構造であればその効果
は同様である。ダストガード110上の溜まった鉄筋2
6bが天板5に掛かっても、切り掛け窓5bがあるので
鉄板製の天板5はぶつからず、変形しなくてすむ。
(Dust Guard) As shown in FIG. 9, a gap Q (see FIG. 6) of about 25 mm corresponding to the thickness of the swing arm 10 is provided between the fixing member 8 and the top plate 5 (see FIG. 6). There is.
The scale (swarf) generated when the reinforcing bar 26 is cut tends to enter the internal cam 11 and the like from this gap, but there is a dust guard 110 to prevent this. Since this is made of rubber and has elasticity as described above, it is in close contact with the top plate 5, the fixing member 8, and the gear cover 2, thereby preventing chips from entering. However, if the operator cuts the reinforcing bar 26 to a length of 10 to 20 mm, the small cut piece 26b is attached to the dust guard 1 as shown in FIG.
Get on top of 10. In this case, the diameter of the reinforcing bar 26 is 1
When the next reinforcing bar 26a is cut while riding, the reinforcing bar 26a presses the cut piece 26b on the dust guard 110 and tries to push the dust guard 110 into the top plate 5. However, since the dust guard 110 has the hollow portion 110a inside, the dust guard 110 can be largely deformed as shown in FIG. In the present embodiment, the width N (FIG. 5) of the hollow portion 110a is about 10 mm for the reinforcing bar 26 having a diameter of 13 mm. The same effect can be obtained with a structure that can be largely deformed, for example, by making the plate movable by a spring, even if it is not hollow rubber. Reinforcing bar 2 accumulated on dust guard 110
Even if 6b is hung on the top plate 5, the top plate 5 made of iron plate does not collide and does not need to be deformed because of the cutout window 5b.

【0023】次に、支軸9に嵌めあう揺腕10のボス部
10aは熱間鍛造のため、精度、面粗度共に優れない。し
かし、リップ状のシール部110cがあるので切粉のシ
ール性がよく、また、その内部には空洞部110bがある
ため、たわみ代を大きくとれシール性が更に増している。 また、本発明のダストガード110は空洞部110a、
110b、シール部110c、ダンパ部110d、フラン
ジ部110eを一体のゴムで成形しているので、コスト
が安く経済的である。しかし、これらは別体の部材である
いはゴム以外の弾性体で作っても効果が同様なのは言う
までもない。
Next, since the boss 10a of the swing arm 10 fitted to the support shaft 9 is hot forged, the accuracy and surface roughness are not excellent. However, since the lip-shaped seal portion 110c is provided, the chip has a good sealing property, and the cavity 110b is provided inside the chip, so that the bending allowance is increased and the sealing property is further improved. Further, the dust guard 110 of the present invention has a hollow portion 110a,
Since the seal 110b, the seal 110c, the damper 110d, and the flange 110e are formed by integral rubber, the cost is low and the cost is low. However, it goes without saying that the effects are the same even if these are made of a separate member or an elastic body other than rubber.

【0024】[0024]

【発明の効果】以上説明した如く本発明によれば次のよ
うな作用効果を奏し得るようになる。 (1)揺腕に回動可能に薄板状のガードを設けたので、万
一切断刃が割れても飛散は防止できる。また、シャフト
を中心に回動可能なため、鉄筋が切断刃からはみ出すよ
うな異常な切断をしても、ガードが回動して逃げるため
ガードの破損は無い。また、切断刃側方のスペースがい
らず、刃部が見やすくできる。
As described above, according to the present invention, the following functions and effects can be obtained. (1) Since the swing arm is provided with a rotatable thin plate-like guard, scattering can be prevented even if the cutting blade is broken. Further, since the guard is rotatable around the shaft, even if the reinforcing bar protrudes from the cutting blade, the guard rotates and escapes, so that there is no damage to the guard. In addition, there is no need for a space beside the cutting blade, and the blade portion can be easily seen.

【0025】(2)固定部材の横にガード壁を設け、空隙
に弾性部材を設けたので、万一切断刃が破損しても、弾
性部材が切断刃の移動を吸収し、ガード壁が力を受け止
めてくれるので飛散は無い。また、鉄筋が切断刃からは
み出すような異常な切断をしても、弾性体が変形して逃
げるためガード壁の破損は無い。また、本構成は別の例
えばギヤカバーのアルミとかダストシールのゴムの一部
を流用し、非常に安くでき経済的である。
(2) Since the guard wall is provided beside the fixing member and the elastic member is provided in the gap, even if the cutting blade is broken, the elastic member absorbs the movement of the cutting blade and the guard wall is forced. There is no scattering because it will receive. Also, even if an abnormal cut such that the reinforcing bar protrudes from the cutting blade, the elastic body is deformed and escapes, so that the guard wall is not damaged. In addition, this configuration uses another part of the aluminum of the gear cover or the rubber of the dust seal, for example, and is very cheap and economical.

【0026】(3)ダストガードがシール材の役目をし、
鉄筋の工具内部への侵入を防止し、工具の故障を防げ
る。また、ダストガード上に短い鉄筋が乗って押しつぶ
されても、ダストガードが弾性体であり、かつ内部に空
洞があるため、大変形しても潰れず復元するので長寿命
なシール効果が得られる。
(3) The dust guard functions as a sealing material,
Prevents the rebar from entering the inside of the tool, preventing tool failure. In addition, even if a short rebar rides on the dust guard and is crushed, the dust guard is elastic and has a cavity inside, so it will not be crushed even if it is greatly deformed, and it will have a long life sealing effect. .

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明を採用した電動式切断曲げ工具の一実施
形態例を示す一部断面側面図。
FIG. 1 is a partial cross-sectional side view showing an embodiment of an electric cutting and bending tool employing the present invention.

【図2】曲げ作業時を示す図1の平面図で。FIG. 2 is a plan view of FIG. 1 showing a bending operation.

【図3】本発明を構成するカッタガードの取り付け状態
を示す背面図。
FIG. 3 is a rear view showing an attached state of a cutter guard constituting the present invention.

【図4】図3の底面図。FIG. 4 is a bottom view of FIG. 3;

【図5】本発明工具の切断部を示す正面図。FIG. 5 is a front view showing a cutting portion of the tool of the present invention.

【図6】本発明工具の切断刃部分を示す斜視図。FIG. 6 is a perspective view showing a cutting blade portion of the tool of the present invention.

【図7】硬いい棒材を切断する際に切断刃が割れた状態
を示す正面図。
FIG. 7 is a front view showing a state where a cutting blade is broken when cutting a hard bar.

【図8】はみ出した鉄筋を切断する状態を示す正面図。FIG. 8 is a front view showing a state in which the protruding reinforcing bar is cut.

【図9】本発明を構成するダストガード周りを示す断面
図。
FIG. 9 is a cross-sectional view showing the periphery of a dust guard constituting the present invention.

【図10】カム式揺動切断機構部の平面図。FIG. 10 is a plan view of a cam-type swing cutting mechanism.

【図11】本発明電動式切断曲げ工具の切断作業時を示
す斜視図。
FIG. 11 is a perspective view showing a cutting operation of the electric cutting and bending tool of the present invention.

【符号の説明】[Explanation of symbols]

2はギヤカバー、2aはアルミ壁、5は天板、5bは天
板の切り掛け窓、8は固定部材、10は揺腕、12aは
可動切断刃、12bは固定切断刃、101はシャフト、
102はトメワ、103はねじりコイルばね、104は
カッタガード、104aはコの字部、104bは折り返
し部、110はダストガード、110a、110bは空
洞部、110cはシール部、110dはダンパ部、11
0eはフランジ部、である。
2 is a gear cover, 2a is an aluminum wall, 5 is a top plate, 5b is a cutout window of the top plate, 8 is a fixed member, 10 is a swing arm, 12a is a movable cutting blade, 12b is a fixed cutting blade, 101 is a shaft,
102 is a tome coil, 103 is a torsion coil spring, 104 is a cutter guard, 104a is a U-shaped part, 104b is a folded part, 110 is a dust guard, 110a and 110b are hollow parts, 110c is a seal part, 110d is a damper part, 11
0e is a flange portion.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 電動機の回転を減速する減速歯車列を内
蔵するギヤカバーと、減速歯車列を介して駆動される出
力軸と、出力軸により駆動されるカムと、カムにより駆
動され支軸を中心に揺動する揺腕と、揺腕に取り付けら
れ、固定部材に取り付けられた固定切断刃に対して進退
可能に対向する可動切断刃とを備え、可動切断刃及び固
定切断刃により棒状の被切断材を切断する電動式切断工
具であって、 前記揺腕にシャフトを中心に回動自在に取り付けられ、
先端が可動切断刃の側方を覆うカッタガードを設けたこ
とを特徴とする電動式切断工具。
1. A gear cover containing a reduction gear train for reducing the rotation of an electric motor, an output shaft driven via the reduction gear train, a cam driven by the output shaft, and a support shaft driven by the cam. A swingable arm, and a movable cutting blade attached to the swingable arm and capable of moving forward and backward with respect to the fixed cutting blade attached to the fixed member. An electric cutting tool for cutting a material, wherein the cutting tool is rotatably mounted on a shaft around a shaft,
An electric cutting tool provided with a cutter guard whose tip covers the side of a movable cutting blade.
【請求項2】 カッタガードの先端に可動切断刃の前後
横3方向を覆うコの字状の覆い部を設けたことを特徴と
する請求項1記載の電動式切断工具。
2. The electric cutting tool according to claim 1, wherein a U-shaped covering portion is provided at a tip end of the cutter guard to cover three directions of the movable cutting blade in front and rear directions.
【請求項3】 電動機の回転を減速する減速歯車列を内
蔵するギヤカバーと、減速歯車列を介して駆動される出
力軸と、出力軸により駆動されるカムと、カムにより駆
動され支軸を中心に揺動する揺腕と、揺腕に取り付けら
れ、固定部材に取り付けられた固定切断刃に対して進退
可能に対向する可動切断刃とを備え、可動切断刃及び固
定切断刃により棒状の被切断材を切断する電動式切断工
具であって、 固定切断刃の側方と外枠側壁の間に空間部を設け、ゴム
等の弾性部材を空間部に介在させたことを特徴とする電
動式切断工具。
3. A gear cover containing a reduction gear train for reducing the rotation of the motor, an output shaft driven via the reduction gear train, a cam driven by the output shaft, and a support shaft driven by the cam. A swingable arm, and a movable cutting blade attached to the swingable arm and capable of moving forward and backward with respect to the fixed cutting blade attached to the fixed member. An electric cutting tool for cutting a material, wherein a space is provided between a side of a fixed cutting blade and an outer frame side wall, and an elastic member such as rubber is interposed in the space. tool.
【請求項4】 電動機の回転を減速する減速歯車列を内
蔵するギヤカバーと、減速歯車列を介して駆動される出
力軸と、出力軸により駆動されるカムと、カムにより駆
動され支軸を中心に揺動する揺腕と、揺腕に取り付けら
れ、固定部材に取り付けられた固定切断刃に対して進退
可能に対向する可動切断刃とを備え、可動切断刃及び固
定切断刃により棒状の被切断材を切断する電動式切断工
具であって、 固定切断刃の前方に、弾性部材からなるダストガードを
設け、ダストガードの内部に空洞部を設けたことを特徴
とする電動式切断工具。
4. A gear cover containing a reduction gear train for reducing the rotation of the motor, an output shaft driven via the reduction gear train, a cam driven by the output shaft, and a support shaft driven by the cam. A swingable arm, and a movable cutting blade attached to the swingable arm and capable of moving forward and backward with respect to the fixed cutting blade attached to the fixed member. An electric cutting tool for cutting a material, wherein a dust guard made of an elastic member is provided in front of a fixed cutting blade, and a hollow portion is provided inside the dust guard.
JP09195298A 1998-04-03 1998-04-03 Electric cutting tool Expired - Fee Related JP3726482B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP09195298A JP3726482B2 (en) 1998-04-03 1998-04-03 Electric cutting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP09195298A JP3726482B2 (en) 1998-04-03 1998-04-03 Electric cutting tool

Publications (2)

Publication Number Publication Date
JPH11285917A true JPH11285917A (en) 1999-10-19
JP3726482B2 JP3726482B2 (en) 2005-12-14

Family

ID=14040925

Family Applications (1)

Application Number Title Priority Date Filing Date
JP09195298A Expired - Fee Related JP3726482B2 (en) 1998-04-03 1998-04-03 Electric cutting tool

Country Status (1)

Country Link
JP (1) JP3726482B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10092966B2 (en) 2014-10-10 2018-10-09 Black & Decker Inc. Dies for threaded rod cutting machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10092966B2 (en) 2014-10-10 2018-10-09 Black & Decker Inc. Dies for threaded rod cutting machine

Also Published As

Publication number Publication date
JP3726482B2 (en) 2005-12-14

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