JPH06238557A - Fixed side flange for installing grinding wheel - Google Patents
Fixed side flange for installing grinding wheelInfo
- Publication number
- JPH06238557A JPH06238557A JP10059793A JP10059793A JPH06238557A JP H06238557 A JPH06238557 A JP H06238557A JP 10059793 A JP10059793 A JP 10059793A JP 10059793 A JP10059793 A JP 10059793A JP H06238557 A JPH06238557 A JP H06238557A
- Authority
- JP
- Japan
- Prior art keywords
- grindstone
- side flange
- flange
- fixed
- mounting
- 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.)
- Withdrawn
Links
Landscapes
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、砥石の取付けを締付け
ねじによって行う研削盤等の砥石取付け用フランジに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone mounting flange for a grinder or the like in which a grindstone is mounted with a tightening screw.
【０００２】[0002]
【従来の技術】従来の固定側フランジは、砥石軸と回転
の遊びがほとんどなく、砥石取付け時のねじ締付けトル
クに対して、取外し時の戻しトルクは８０％程度の値と
なっていた。2. Description of the Related Art A conventional fixed-side flange has almost no rotational play with the grindstone shaft, and the return torque upon removal is about 80% of the screw tightening torque upon mounting the grindstone.
【０００３】[0003]
【発明が解決しようとする課題】従来の砥石取付け用固
定側フランジでは、過大な研削トルクがかかった時に締
付けねじが締まるため締付けトルクが大きくなってしま
い付属している標準形のスパナでは、砥石を外すことに
苦労することがあった。本発明の目的は、戻しトルクを
小さくすることで、標準形のスパナにより砥石の取外し
を容易にすることである。In the conventional fixed-side flange for mounting a whetstone, the tightening torque is increased because the tightening screw is tightened when an excessive grinding torque is applied. I had a hard time removing it. An object of the present invention is to facilitate removal of the grindstone with a standard spanner by reducing the return torque.
【０００４】[0004]
【課題を解決するための手段】本発明の目的は、砥石取
付け用固定側フランジにおいて、砥石軸と噛み合い回転
トルクを伝達する部分に適当な遊びを持たせる構造とす
ることで達成される。即ち固定側フランジは砥石軸と接
し、砥石軸の締付けねじの軸力を受ける面がフランジと
砥石が接して、軸力を受ける面よりも直径が小さいので
遊びがあると同じ軸力で対応しトルクが小さくなる砥石
軸とフランジとの間で回転して戻しトルクが小さくな
る。ある量戻ると軸力が低下してフランジと砥石の接し
ている面又は砥石とナットの接している面で小さいトル
クで回転することができる。The object of the present invention is achieved by providing a structure in which a fixed flange for mounting a grindstone has a proper play at a portion which meshes with a grindstone shaft and transmits a rotational torque. That is, the fixed side flange is in contact with the grindstone shaft, and the face of the grindstone shaft that receives the axial force of the tightening screw has a smaller diameter than the face of the grindstone where the flange and the grindstone are in contact. The return torque is reduced by rotating between the grindstone shaft and the flange where the torque is reduced. When it returns by a certain amount, the axial force decreases and the surface contacting the flange and the grindstone or the surface contacting the grindstone and the nut can rotate with a small torque.
【０００５】また、フランジと砥石軸との回転トルクを
伝える面は、従来においてそれぞれ平行な２面であり線
接触する形状であった。本発明は、面接触させることで
接触部の摩耗を防止し、且つ硬度を上げて摩耗を防止す
ることができる。Further, in the past, the surfaces for transmitting the rotational torque between the flange and the grindstone shaft were two parallel surfaces which were in line contact with each other. According to the present invention, it is possible to prevent wear of the contact portion by making the surface contact, and to increase the hardness to prevent wear.
【０００６】また、上記の遊びを大きくしたフランジで
は、砥石軸の停止加速度が大きい時に砥石の取付けがゆ
るむことが考えられるので、遊びの小さいフランジと締
結した状態で研削作業を行なう。砥石取外し時には締結
を解除するとことで、フランジが砥石軸と回転する様に
なり戻しトルクが小さくなる。Further, with the above-mentioned flange having a large amount of play, it is possible that the whetstone is loosely attached when the stopping acceleration of the whetstone shaft is large. Therefore, the grinding work is performed in a state in which the flange is fastened with a small amount of play. By releasing the fastening when removing the grindstone, the flange rotates with the grindstone shaft and the return torque becomes small.
【０００７】また、従来は砥石取付け、取外しに際して
砥石軸の固定を歯車等の固定によって行なっていたが、
上記の様にフランジ間の締結を解除すると同時に砥石軸
の固定をするようにする。例えば側面から先端が、テー
パ状となったピンをフランジの側面の穴に指し込むこと
で、締結している部品を動かし締結を解除すると同時に
ピンによりフランジの回転を固定することができる。Further, conventionally, when the grindstone was attached and detached, the grindstone shaft was fixed by fixing a gear or the like.
As described above, the fastening between the flanges is released and the grindstone shaft is fixed at the same time. For example, by pointing a pin with a tapered end from the side surface into a hole on the side surface of the flange, it is possible to move the components being fastened to release the fastening and at the same time to fix the rotation of the flange by the pin.
【０００８】また、フランジと砥石軸との回転トルクを
伝える面と鉛直に小径のねじをフランジに設け外周方向
からねじを回転することで、遊びの大きさを変えること
ができる。また、上記ねじを回転するドライバーの部分
の入る穴と軸方向の可動で回転方向に固定されたドライ
バーの位置関係で砥石軸の回転を固定できる。Further, the size of the play can be changed by providing the flange with a small diameter screw perpendicular to the surface for transmitting the rotational torque between the flange and the grindstone shaft and rotating the screw from the outer peripheral direction. Further, the rotation of the grindstone shaft can be fixed by the positional relationship between the hole into which the driver portion for rotating the screw is inserted and the axially movable and fixed driver.
【０００９】[0009]
【作用】図１に携帯用研削盤において、最も一般的な電
気ディスクグラインダの全体構成を示す。図２は固定側
フランジ５に関連する各部品を離した状態を示す拡大図
であり、砥石軸６に固定側フランジ５を取付けその上に
砥石４をのせて締付け側フランジ３によって締付けられ
る。固定側フランジ５を図２の下方から見たのが図３で
あり、この図では平行な２面で形成される砥石軸との噛
み合い部８を持っており、その間隔がｌｎである。図５
は砥石軸の２面のフランジとの噛み合い部７の間隔ｌ0
との関係を示したものでｌ0よりｌｎは常に大きくｌｎ
を大きくして行くと回転方向についての遊びが大きくな
ることがわかる。ｌｎを変えて遊びを変えた場合の戻し
角度と戻しトルクの関係図でｌｎをｌ0とほぼ等しくし
た場合は、戻しトルクｔ0は締め付けトルクの約０．８
倍になる。次にｌｎ＝ｌ1とした場合は、回転の遊びの
ある間はフランジの砥石軸との接触面１０と、砥石軸６
のフランジとの接触面９でねじの締付け力を受けるので
摩擦面の半径が小さくなり小さいトルクｔｃで回転でき
る。更に戻し角度を大きくすると遊びの部分を滑りフラ
ンジとの噛み合い部７と砥石軸との噛み合い部８が接触
するので戻しトルクはｔ1まで増大し、その後戻し角度
と共に下がって行く。更にｌｎをｌ2ｌ3ｌ4と大きくし
て行くと最大の戻しトルクはｔ2→ｔ4と小さくなる。な
お、図５は固定側フランジ５の砥石４に接する部分の外
径が４０mmでフランジとの接触面９の外径が２０mmの場
合の測定例に基づいたものであり、図５から戻しトルク
比の上限を遊びのない場合の０．８より小さく０．７５
とすると、戻し角度は２度以上あれば良く、又ｔｃが戻
しトルク比０．４５であり、その値よりｔｎを小さくす
るには、戻し角度を１５度以上にする必要がある。これ
は測定の一例で、締付トルクの大きさ、砥石４と固定側
フランジ５の摩擦係数、フランジとの接触面９と砥石軸
との接触面１０の有効径と摩擦係数によって戻し角度と
戻しトルク比の関係は異なってくるので、余裕を見て戻
し角度を３０度程度とすることもある。FIG. 1 shows the overall structure of the most common electric disk grinder in a portable grinding machine. FIG. 2 is an enlarged view showing a state in which the respective parts related to the fixed side flange 5 are separated from each other, and the fixed side flange 5 is mounted on the grindstone shaft 6 and the grindstone 4 is placed thereon and tightened by the tightening side flange 3. FIG. 3 is a view of the fixed side flange 5 seen from below in FIG. 2. In this figure, there is a meshing portion 8 with a grindstone shaft formed by two parallel surfaces, and the distance is ln. Figure 5
Is the interval l 0 of the meshing portion 7 with the flanges on the two surfaces of the grindstone shaft.
Ln is always larger than l 0
It can be seen that the play in the direction of rotation increases as is increased. In the relationship diagram of the return angle and the return torque when the play is changed by changing ln, when ln is almost equal to l 0 , the return torque t 0 is about 0.8 of the tightening torque.
Double. Next, when ln = l 1 , the contact surface 10 of the flange with the grindstone shaft and the grindstone shaft 6 are provided while there is a play of rotation.
Since the contact surface 9 with the flange receives the screw tightening force, the radius of the friction surface becomes smaller, and the screw can rotate with a small torque tc. When the return angle is further increased, the play portion comes into contact with the engagement portion 7 with the sliding flange and the engagement portion 8 with the grindstone shaft, so that the return torque increases to t 1 and then decreases with the return angle. When ln is further increased to l 2 l 3 l 4 , the maximum return torque becomes smaller as t 2 → t 4 . Note that FIG. 5 is based on a measurement example in which the outer diameter of the portion of the fixed side flange 5 in contact with the grindstone 4 is 40 mm and the outer diameter of the contact surface 9 with the flange is 20 mm. The upper limit of 0.7 is less than 0.8 without play and 0.75
Then, the return angle may be 2 degrees or more, and tc is the return torque ratio of 0.45. To reduce tn from that value, the return angle needs to be 15 degrees or more. This is an example of measurement, and the return angle and the return are determined by the magnitude of the tightening torque, the friction coefficient between the grindstone 4 and the fixed side flange 5, the effective diameter and the friction coefficient of the contact surface 9 with the flange and the contact surface 10 with the grindstone shaft. Since the relationship of the torque ratio is different, the return angle may be set to about 30 degrees with a margin in mind.
【００１０】[0010]
【実施例】図１は本発明による電気ディスクグラインダ
の全体構成図を示すものである。研削盤本体１には砥石
軸６があり、この砥石軸６に固定側フランジ５と砥石締
付け側フランジ３が取付いた構成となっている。なお安
全のために砥石カバー２が具備されており、且つ砥石４
は破断した状態で図示してある。図２は砥石軸６、固定
側フランジ５及び砥石締付け側フランジ３を各々分離し
たものを図示したものであり、フランジとの噛み合い部
７、砥石軸との噛み合い部８によって固定側フランジ５
と砥石軸が噛み合い、砥石軸６のフランジとの接触面９
でねじによる締付け力を受ける。図３は図２の固定側フ
ランジ５を下方から見た図であり、砥石軸との接触面１
０で締付け力を受ける。図４及び図５は、本発明の作動
状態を示している。図６は砥石軸との噛み合い部８が固
定側フランジ５の外周まで出ていないので剛性があり小
形化することができる。図７及び図８は、固定側フラン
ジの他の実施例を示すもので、図３及び図５の場合に噛
み合い部８では、線接触となり摩耗するおそれが生じる
ため面接触に近くなる様に固定側フランジの形状を工夫
したものである。また摩耗を防ぐために砥石軸との噛み
合い部８又は砥石軸との接触面１０にＴｉＣやＴｉＮ、
ＤＬＣ、その他のコーティング等の表面処理、部分焼入
などを行なうこともある。ＴｉＣやＴｉＮ、ＤＬＣ等を
コーティングすると摩擦係数も下がりより小さいゆるめ
トルクで砥石のゆるめ作業を行うことができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall construction of an electric disk grinder according to the present invention. The grinder main body 1 has a grindstone shaft 6, and a fixed side flange 5 and a grindstone tightening side flange 3 are attached to the grindstone shaft 6. For safety, the whetstone cover 2 is provided and the whetstone 4
Is shown in a broken state. FIG. 2 shows the grindstone shaft 6, the fixed side flange 5 and the grindstone tightening side flange 3 which are separated from each other. The fixed side flange 5 is formed by the engagement portion 7 with the flange and the engagement portion 8 with the grindstone shaft.
And the grindstone shaft mesh with each other, and the contact surface 9 with the flange of the grindstone shaft 6
Receives the tightening force from the screw. FIG. 3 is a view of the fixed side flange 5 of FIG. 2 as seen from below, showing a contact surface 1 with the grindstone shaft.
A tightening force of 0 is received. 4 and 5 show the operating state of the present invention. In FIG. 6, since the meshing portion 8 with the grindstone shaft does not extend to the outer periphery of the fixed side flange 5, it has rigidity and can be downsized. FIG. 7 and FIG. 8 show another embodiment of the fixed side flange. In the case of FIG. 3 and FIG. 5, the meshing portion 8 is fixed so that the meshing portion 8 becomes line contact and wear may occur, so that it is close to surface contact. The shape of the side flange is devised. Further, in order to prevent wear, TiC or TiN, on the meshing portion 8 with the grindstone shaft or the contact surface 10 with the grindstone shaft,
Surface treatment such as DLC and other coatings and partial hardening may be performed. When TiC, TiN, DLC, etc. are coated, the friction coefficient is also lowered, and the loosening work of the grindstone can be performed with a smaller loosening torque.
【００１１】以上の方式で過大な研削トルクがかかって
も砥石の取外しが容易になるが、砥石軸の停止加速度が
大きい場合には、砥石取付けがゆるむことが考えられ
る。図９及び図１０は、砥石軸６と、遊びの小さいフラ
ンジ１１と、固定側フランジ５とを締結した状態で研削
作業を行ない砥石取外し時には、締結を解除することを
示す他の実施例である。即ち図９は研削作業時の状態を
示しており、砥石軸６に遊びの大きい固定側フランジ５
と遊びの少ないフランジ１１が付いている。固定側フラ
ンジ５と遊びの少ないフランジ１１は、結合ピン１７で
回動可能に結合された上、バネ１３で押された締結ピン
１２の先端がロック穴１４に入ることにより締結された
状態にある。図１０は砥石を取外す時の状態でロックピ
ン１５をロック穴１４に入れ締結ピン１２がロック穴１
４から抜けた状態である。これにより固定側フランジ５
は、本来の遊びを持つことになり小さい戻しトルクでゆ
るめることができる。また同時にロックピン１５を研削
盤本体１に軸方向移動のみ可として設置することで砥石
軸６を遊びの少ないフランジ１１とともに固定できる。With the above method, the grindstone can be easily removed even if an excessive grinding torque is applied, but it is conceivable that the grindstone is loosely attached when the stopping acceleration of the grindstone shaft is large. FIGS. 9 and 10 show another embodiment showing that the grindstone shaft 6, the flange 11 having a small amount of play, and the fixed side flange 5 are fastened to each other to perform the grinding work and to release the fastening when the grindstone is removed. . That is, FIG. 9 shows a state at the time of grinding work.
And a flange 11 with little play is attached. The fixed-side flange 5 and the flange 11 with little play are rotatably coupled by a coupling pin 17, and are fastened by the tip of the fastening pin 12 pressed by the spring 13 entering the lock hole 14. . FIG. 10 shows that when the grindstone is removed, the lock pin 15 is inserted into the lock hole 14 and the fastening pin 12 is locked in the lock hole 1.
It is in a state where it has exited from 4. As a result, the fixed side flange 5
Has a natural play and can be loosened with a small return torque. At the same time, by installing the lock pin 15 on the grinder main body 1 so as to be movable only in the axial direction, the grindstone shaft 6 can be fixed together with the flange 11 with less play.
【００１２】なお、遊びの少ないフランジ１１はフラン
ジとの噛み合い部の延長と噛み合っている。砥石取付け
のために締付けトルクをかけると固定側フランジ５は遊
びの分だけ戻り締結ピン１２がロック穴１４の位置に戻
りロックピン１５を後退させるとロック穴１４に入り図
９の状態に戻る。図１１も他の実施例を示すものであり
図９及び図１０と同様であるが、締結ピン１２のかわり
に板ばね１８が固定側フランジ５に取付けられており板
バネ１８の先端が遊びの少ないフランジ１１のロック穴
１４に入って固定側フランジ５との回動を締結した状態
となっている。先端が細くなったロックピン１９を押し
込むことで締結が解除されて同時に砥石軸６の固定がで
きる。図１２は遊びの少ないフランジ１１が、軸方向に
移動可能な実施例を示したものであり砥石軸の段２１に
支えられたプレート２２が支持バネ２３で遊びの少ない
フランジ１１を固定側フランジ５に押し付けている。各
フランジには、図１３に示すように凸部２０と凹部２５
があり、図１２は凸部が凹部に入って遊びを止めている
状態を示している。図１３は解除プレート２４が移動し
てフランジ間を離し、少し固定側フランジが回転した状
態である。解除プレート２４の移動と同時に砥石軸６の
固定も行なえる。図１４は固定側フランジ５の偏心した
位置にねじ穴を設け六角穴付ボルト２６が止まるまで締
めたもので、ボルト先端２７で遊びを押える構造であ
る。六角穴付ボルト２６がゆるんで飛び出すことを防止
するために逃げ穴２８に内径止め輪を入れたり、ボルト
先端２７に外径止め輪を付けることもある。図１５は、
固定側フランジ５の六角穴付ボルト２６を締付ける六角
先端のドライバー２９が取付いた砥石軸固定プレート３
０であり、ガイド３１で研削盤本体１に矢視方向３２、
３３のみ可動な様に取付られている。矢視方向３２に動
かして、固定溝３４でフランジとの噛み合い部の延長１
６をはさみ砥石軸６を固定し、更に押して回転可能溝ま
でフランジとの噛み合い部の延長１６を入れ、砥石軸６
を手で回転して、六角先端のドライバー２９の先が六角
穴付ボルト２６の六角穴に入れて、六角先端のドライバ
ー２９で締付けを行なう。締付け後、砥石軸固定プレー
ト３０を矢視３３の方向に少し戻し、六角先端のドライ
バー２９が、固定側フランジ５より出たところで締付け
側フランジ３に戻しトルクを加えると小さいトルクで砥
石４の取外し作業を行うことができる。矢視３３の方向
への移動は、スプリング等で自動的に行なうこともでき
る。図１６は、固定側フランジ５の遊びを押さえる他の
実施例を示すものであり板バネ３６にピース３７が付い
ている。板バネ３６は固着部３８で固定側フランジ５に
固定されている。板バネ３６は荷重がかからない状態で
は図１６の状態である。この状態でわずかなすきまをお
いて、バックアップローラ３９がありピース３７が２点
鎖線で示した砥石軸６から受ける荷重をバックアップロ
ーラ３９が受け持ち遊びを押さえる構造となっている。
なお、バックアップローラ３９は、スプリング４０で図
の上方に押しつけられている。砥石取外し時には、取外
しプレート４１を図の下方矢視４２の方に押してきてバ
ックアップローラ３９に付いたピン４３を先端のそり状
形状を利用して、矢視４４の方向に押し下げる。バック
アップローラ３９が、矢視４４の方向に動き板バネ３６
をバックアップしなくなると板バネ３６は砥石軸６から
受ける荷重でたわみ遊びが大きくなり、小さい戻しトル
クでゆるめことができる。取外しプレート４１では同時
に砥石軸６を固定することができる。It should be noted that the flange 11 with less play is engaged with the extension of the engaging portion with the flange. When a tightening torque is applied to attach the grindstone, the fixed side flange 5 returns by the amount of play, the fastening pin 12 returns to the position of the lock hole 14, and when the lock pin 15 is retracted, it enters the lock hole 14 and returns to the state of FIG. FIG. 11 also shows another embodiment, which is similar to FIGS. 9 and 10, but a leaf spring 18 is attached to the fixed side flange 5 instead of the fastening pin 12, and the tip of the leaf spring 18 is free of play. The small number of flanges 11 enter the lock holes 14 and are in a state in which the rotation with the fixed side flange 5 is fastened. By pushing in the lock pin 19 having a thin tip, the fastening is released and the grindstone shaft 6 can be fixed at the same time. FIG. 12 shows an embodiment in which the flange 11 with less play is movable in the axial direction, and the plate 22 supported by the step 21 of the grindstone shaft is supported by the support spring 23 so that the flange 11 with less play is fixed. Are pressed against. As shown in FIG. 13, each flange has a convex portion 20 and a concave portion 25.
FIG. 12 shows a state in which the convex portion enters the concave portion to stop the play. FIG. 13 shows a state in which the release plate 24 has moved to separate the flanges, and the fixed side flange has slightly rotated. The grindstone shaft 6 can be fixed simultaneously with the movement of the release plate 24. FIG. 14 shows a structure in which a screw hole is provided at an eccentric position of the fixed side flange 5 and the hexagon socket head cap screw 26 is tightened until it stops. In order to prevent the hexagon socket head cap screw 26 from loosening and jumping out, an inner diameter retaining ring may be inserted in the escape hole 28, or an outer diameter retaining ring may be attached to the bolt tip 27. Figure 15 shows
Whetstone shaft fixing plate 3 with a hexagonal tip driver 29 for tightening the hexagon socket head cap screw 26 of the fixed side flange 5
0, and the guide 31 directs the grinder main body 1 in the arrow direction 32,
Only 33 is attached so as to be movable. Move in the direction of arrow 32 to extend the engagement part with the flange in the fixing groove 34 1
6 to fix the grindstone shaft 6 and further push to insert the extension 16 of the engaging portion with the flange up to the rotatable groove.
Is rotated by hand to insert the tip of the hexagonal screwdriver 29 into the hexagonal hole of the hexagon socket head bolt 26, and tighten with the hexagonal screwdriver 29. After tightening, the grindstone shaft fixing plate 30 is slightly returned in the direction of the arrow 33, and when the hexagonal tip driver 29 applies a returning torque to the tightening side flange 3 when it comes out of the fixed side flange 5, the grindstone 4 is removed with a small torque. You can do the work. The movement in the direction of the arrow 33 can be automatically performed by a spring or the like. FIG. 16 shows another embodiment in which the play of the fixed side flange 5 is suppressed, and a leaf spring 36 is provided with a piece 37. The leaf spring 36 is fixed to the fixed side flange 5 by a fixing portion 38. The leaf spring 36 is in the state of FIG. 16 when no load is applied. In this state, with a slight clearance, the backup roller 39 is provided and the backup roller 39 bears the load that the piece 37 receives from the grindstone shaft 6 shown by the chain double-dashed line, and suppresses the play.
The backup roller 39 is pressed upward by a spring 40 in the figure. At the time of removing the grindstone, the removal plate 41 is pushed toward the downward arrow 42 in the figure, and the pin 43 attached to the backup roller 39 is pushed down in the direction of the arrow 44 using the sled shape of the tip. The backup roller 39 moves in the direction of the arrow 44, and the leaf spring 36
When it is no longer backed up, the leaf spring 36 has a large flexural play under the load received from the grindstone shaft 6, and can be loosened with a small return torque. The removal plate 41 can fix the grindstone shaft 6 at the same time.
【００１３】図１７は、固定側フランジ５の内径部に段
差のある円筒状のサポータ４５を圧入等によって固着
し、サポータ４５の端面４６を固定側フランジ５の面よ
り若干高く構成することで、砥石軸６のフランジとの接
触面９と接触する構造とした固定側フランジ５の断面図
であり、図１８は図１７を右側面から見た右側面図であ
る。In FIG. 17, a cylindrical supporter 45 having a step is fixed to the inner diameter portion of the fixed side flange 5 by press fitting or the like, and the end surface 46 of the supporter 45 is constructed to be slightly higher than the surface of the fixed side flange 5. FIG. 18 is a cross-sectional view of the fixed-side flange 5 configured to come into contact with the contact surface 9 with the flange of the grindstone shaft 6, and FIG. 18 is a right side view of FIG. 17 viewed from the right side.
【００１４】サポータ４５の外径を小さくしたり、端面
４６の外周部にＣ面やＲ面を付けて実質的な接触面径を
小さくすることで、戻しトルクの低減を図ることができ
る。また、サポータ４５に浸硫窒化・低温浸硫処理・Ｔ
ｉＣコーティング等により、潤滑性のある表面処理・低
摩擦係数のコーティング等を行うこともでき、端面４６
の仕上面の向上等も含めて戻しトルクを低減することが
できる。一体構造のフランジでは、このような対策は製
造工程や価格等の問題により対策が取りにくい。耐久性
の向上には窒化による硬化や焼入れ硬化材への低温浸硫
処理・ＴｉＣコーティング等の硬度の上昇措置で対処す
ることもできる。なお、砥石軸６のフランジとの接触面
９の仕上面の向上と、ガス軟窒化・ＴｉＣコーティング
・ＴｉＮコーティング等による硬度の上昇で、更に戻し
トルクの向上と耐久性の向上を図ることもできる。Ｔｉ
ＣコーティングとＴｉＮコーティングとの組合せでは、
鋼同志の摩擦より摩擦係数が半分以下になるので、サポ
ータ４５にＴｉＮコーティング、砥石軸６のフランジと
の接触面９にＴｉＣコーティングを行うこともある。The return torque can be reduced by reducing the outer diameter of the supporter 45 or by attaching a C surface or an R surface to the outer peripheral portion of the end surface 46 to reduce the substantial contact surface diameter. In addition, the supporter 45 is subjected to sulfuritriding / low temperature sulfurization / T.
It is also possible to perform surface treatment with lubricity, coating with a low friction coefficient, etc. by using iC coating, etc.
It is possible to reduce the return torque including the improvement of the finished surface. With a monolithic flange, it is difficult to take such measures due to problems such as manufacturing process and price. The durability can be improved by hardening by nitriding, low-temperature sulfurization treatment on a quench-hardened material, or hardness increasing measures such as TiC coating. It is also possible to further improve the return torque and the durability by improving the finishing surface of the contact surface 9 with the flange of the grindstone shaft 6 and increasing the hardness by gas soft nitriding, TiC coating, TiN coating, and the like. . Ti
In the combination of C coating and TiN coating,
Since the friction coefficient is less than half that of steel, the supporter 45 may be coated with TiN and the contact surface 9 of the grindstone shaft 6 with the flange may be coated with TiC.
【００１５】図１９乃至図２４は、２枚の円盤状円筒形
部品４７，４８が装着された実施例である。19 to 24 show an embodiment in which two disc-shaped cylindrical parts 47 and 48 are mounted.
【００１６】即ち、図２１及び図２２に示したように、
固定側フランジ５に保持穴４９及び保持溝５０を設け、
この保持穴４９に、図２３に示した円盤状円筒形部品４
８を装入し、保持溝５０には、図２４に示した円盤状円
筒形部品４７を装入して図１９及び図２０の状態とし、
回動可能に装着したものである。２枚の円盤状円筒形部
品４７，４８の紛失を防ぐためには、図１９に示したよ
うに抜け止め５１として突起等を設ければ良い。抜け止
め５１の突起は、溶接による突起でも良く、またピンの
圧入等各種の方法が考えられる。２枚の円盤状円筒形部
品４７，４８を介在させることによる利点は、円盤状円
筒形部品４７，４８の面仕上げを良くし耐摩耗性を持た
せることで、固定側フランジ５と砥石軸６の砥石軸との
接触面１０やフランジとの接触面９の仕上げ面程度や、
耐摩耗性をあまり良くしなくとも良く、低コスト化が図
れることである。なお、円盤状円筒形部品４７，４８の
何れか一方若しくは両方に固体潤滑性を持たせることで
戻しトルクを更に小さくすることもできる。That is, as shown in FIGS. 21 and 22,
A holding hole 49 and a holding groove 50 are provided in the fixed side flange 5,
The disc-shaped cylindrical component 4 shown in FIG.
8 is loaded, and the holding groove 50 is loaded with the disk-shaped cylindrical part 47 shown in FIG. 24 to obtain the state shown in FIGS. 19 and 20,
It is rotatably mounted. In order to prevent the two disk-shaped cylindrical parts 47, 48 from being lost, a protrusion or the like may be provided as the retainer 51 as shown in FIG. The protrusion of the retainer 51 may be a protrusion by welding, and various methods such as press-fitting of a pin can be considered. The advantage of interposing the two disk-shaped cylindrical parts 47 and 48 is that the surface finish of the disk-shaped cylindrical parts 47 and 48 is improved and wear resistance is provided, so that the fixed side flange 5 and the grindstone shaft 6 are provided. Of the finished surface of the contact surface 10 with the grinding wheel shaft and the contact surface 9 with the flange,
The wear resistance does not have to be improved so much, and the cost can be reduced. The return torque can be further reduced by providing either or both of the disk-shaped cylindrical parts 47 and 48 with solid lubricity.
【００１７】図２５乃至図２７は、同等の径の２枚の円
盤状円筒形部品５１，５２が装着された実施例である。25 to 27 show an embodiment in which two disk-shaped cylindrical parts 51 and 52 having the same diameter are mounted.
【００１８】即ち、図２６及び図２７に示したように、
固定側フランジ５に２本の保持溝の底面５３の幅とほぼ
等しい直径の保持穴４９を設け、この保持穴４９の中に
保持溝５０を利用して２枚の円盤状円筒形部品５１，５
２を装入する。装入後、保持溝５０のひさし５４をかし
めることで、円盤状円筒形部品５１，５２が回動可能で
しかも脱落や紛失を防止するように構成する。なお、２
枚の円盤状円筒形部品５１，５２の大きさ、形状を変え
ることも可能であるが、常に円盤状円筒形部品５２は円
盤状円筒形部品５１と同等か直径が大きいように構成さ
れることが望ましい。このかしめによる方式は、先に述
べた図１９の実施例より更に低コスト化が図れるもので
ある。That is, as shown in FIGS. 26 and 27,
The fixed flange 5 is provided with a holding hole 49 having a diameter substantially equal to the width of the bottom surface 53 of the two holding grooves, and the holding groove 50 is utilized in the holding hole 49 to form two disc-shaped cylindrical parts 51, 5
Charge 2. After the charging, the eaves 54 of the holding groove 50 is caulked, so that the disk-shaped cylindrical parts 51 and 52 can be rotated and can be prevented from falling or being lost. 2
Although it is possible to change the size and shape of the disk-shaped cylindrical parts 51, 52, the disk-shaped cylindrical part 52 should always be configured to have a diameter equal to or larger than that of the disk-shaped cylindrical part 51. Is desirable. This caulking method can further reduce the cost as compared with the embodiment shown in FIG.
【００１９】図２８乃至図３０は、２枚の円盤状円筒形
部品５１，５２が装着された他の実施例である。28 to 30 show another embodiment in which two disk-shaped cylindrical parts 51 and 52 are mounted.
【００２０】即ち、図２８乃至図３０に示したように、
砥石軸との噛み合い部８の中央部の幅とほぼ等しい径
（少し大きい場合もある）の保持穴４９を設け、円盤状
円筒形部品５２の直径は保持穴４９の内で回動できるよ
うに僅かに小さい径としてある。組み立てた状態図を示
す図２９及び図３０からわかる様に、円盤状円筒形部品
５２の面５６は常に固定側フランジ５の面５７より出た
状態の厚みとしてある。抜け止め用突起５５は砥石軸６
のフランジとの噛み合い部７が回動したときにも当たら
ない寸法で、溶接材等による盛金・小片のロー付け・塑
性変形による盛り上げや打痕等により設置してある。こ
の抜け止め用突起による方法は、図２７に示したかしめ
方式よりも更にコストの低減を図ることができる。That is, as shown in FIGS. 28 to 30,
A holding hole 49 having a diameter (which may be a little larger) substantially equal to the width of the central portion of the meshing portion 8 with the grindstone shaft is provided, and the diameter of the disk-shaped cylindrical part 52 is configured to be rotatable within the holding hole 49. The diameter is slightly smaller. As can be seen from FIGS. 29 and 30 showing the assembled state diagram, the surface 56 of the disk-shaped cylindrical part 52 is always the thickness of the state protruding from the surface 57 of the fixed side flange 5. The retaining protrusion 55 is the grindstone shaft 6
The size is such that it does not hit even when the meshing part 7 with the flange rotates, and it is installed by depositing a weld metal or the like, brazing a small piece, raising by plastic deformation, or dents. The method using the retaining projections can further reduce the cost as compared with the caulking method shown in FIG.
【００２１】[0021]
【発明の効果】戻しトルクを小さくしたので、過大な研
削トルクがかかった場合にも通常のスパナで、締付け側
フランジを容易に取外すことができる。Since the return torque is reduced, the tightening side flange can be easily removed with an ordinary spanner even when an excessive grinding torque is applied.
【図１】携帯用研削盤の全体構成を示す斜視図。FIG. 1 is a perspective view showing the overall configuration of a portable grinding machine.
【図２】本発明になる砥石の各取付部品を示す斜視図。FIG. 2 is a perspective view showing each attachment part of the grindstone according to the present invention.
【図３】本発明になる固定側フランジを示す斜視図。FIG. 3 is a perspective view showing a fixed side flange according to the present invention.
【図４】遊びを示す説明図。FIG. 4 is an explanatory view showing play.
【図５】戻し角度と戻しトルクの関係を示すグラフ。FIG. 5 is a graph showing the relationship between the return angle and the return torque.
【図６】固定側フランジの他の実施例を示す斜視図。FIG. 6 is a perspective view showing another embodiment of the fixed side flange.
【図７】固定側フランジの他の実施例を示す斜視図。FIG. 7 is a perspective view showing another embodiment of the fixed side flange.
【図８】固定側フランジの他の実施例を示す斜視図。FIG. 8 is a perspective view showing another embodiment of the fixed side flange.
【図９】遊びの少ないフランジを用いた実施例を示す側
面図。FIG. 9 is a side view showing an embodiment using a flange with little play.
【図１０】遊びの少ないフランジを用いた実施例を示す
側面図。FIG. 10 is a side view showing an embodiment using a flange with little play.
【図１１】遊びの少ないフランジを用いた他の実施例を
示す側面図。FIG. 11 is a side view showing another embodiment using a flange with little play.
【図１２】軸方向に移動可能な遊びの少ないフランジを
用いた実施例を示す側面図。FIG. 12 is a side view showing an embodiment using a flange with little play that is movable in the axial direction.
【図１３】軸方向に移動可能な遊びの少ないフランジを
用いた実施例を示す側面図。FIG. 13 is a side view showing an embodiment using a flange with little play that is movable in the axial direction.
【図１４】遊びを変えられる固定側フランジの一実施例
を示す斜視図。FIG. 14 is a perspective view showing an embodiment of a fixed side flange whose play can be changed.
【図１５】遊びを変えられる固定側フランジの砥石軸固
定装置の実施例を示す斜視図。FIG. 15 is a perspective view showing an embodiment of a whetstone shaft fixing device of a fixed side flange whose play can be changed.
【図１６】遊びを変えられる固定側フランジの他の実施
例を示す側面図。FIG. 16 is a side view showing another embodiment of the fixed side flange whose play can be changed.
【図１７】内径に円筒状部品を固着したフランジの実施
例を示す断面図。FIG. 17 is a cross-sectional view showing an embodiment of a flange having a cylindrical part fixed to its inner diameter.
【図１８】内径に円筒状部品を固着したフランジの実施
例を示す側面図。FIG. 18 is a side view showing an embodiment of a flange in which a cylindrical part is fixed to the inner diameter.
【図１９】固定側フランジの他の実施例を示す平面組立
図。FIG. 19 is a plan assembly view showing another embodiment of the fixed side flange.
【図２０】固定側フランジの他の実施例を示す側面組立
図。FIG. 20 is a side assembly view showing another embodiment of the fixed side flange.
【図２１】固定側フランジの他の実施例を示す正面図。FIG. 21 is a front view showing another embodiment of the fixed side flange.
【図２２】固定側フランジの他の実施例を示す側面図。FIG. 22 is a side view showing another embodiment of the fixed side flange.
【図２３】図１９及び図２０に示す円盤状円筒形部品４
８の断面図。FIG. 23 is a disk-shaped cylindrical component 4 shown in FIGS. 19 and 20.
Sectional drawing of 8.
【図２４】図１９及び図２０に示す円盤状円筒形部品４
７の断面図。FIG. 24 is a disk-shaped cylindrical component 4 shown in FIGS. 19 and 20.
Sectional drawing of 7.
【図２５】かしめ方式による固定側フランジの実施例を
示す平面図。FIG. 25 is a plan view showing an embodiment of a fixed side flange by a caulking method.
【図２６】かしめ方式による固定側フランジの実施例を
示す側面図。FIG. 26 is a side view showing an embodiment of a fixed side flange by a caulking method.
【図２７】かしめ方式による固定側フランジの実施例を
示す組立側面断面図。FIG. 27 is an assembled side sectional view showing an embodiment of a fixed side flange by a caulking method.
【図２８】抜け止め用突起を設けた固定側フランジの実
施例を示す平面図。FIG. 28 is a plan view showing an embodiment of a fixed-side flange provided with a retaining protrusion.
【図２９】抜け止め用突起を設けた固定側フランジの実
施例を示す側面図。FIG. 29 is a side view showing an embodiment of a fixed-side flange provided with a retaining protrusion.
【図３０】抜け止め用突起を設けた固定側フランジの実
施例を示す組立側面断面図。FIG. 30 is an assembled side sectional view showing an embodiment of a fixed side flange provided with a retaining protrusion.
５は固定側フランジ、６はフランジとの噛み合い部、８
は砥石軸との噛み合い部、９はフランジとの接触面、１
０は砥石軸との接触面、１１は遊びの少ないフランジ、
１２は締結ピン、１５はロックピンである。5 is a fixed side flange, 6 is an engaging portion with the flange, 8
Is a meshing portion with the grindstone shaft, 9 is a contact surface with a flange, 1
0 is the contact surface with the wheel axis, 11 is a flange with little play,
12 is a fastening pin and 15 is a lock pin.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石川 博康 茨城県勝田市武田1060番地 日立工機株式 会社内 (72)発明者 小林 十郎 茨城県勝田市武田1060番地 日立工機株式 会社内 (72)発明者 金田 孝允 茨城県勝田市武田1060番地 日立工機エン ジニアリング株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyasu Ishikawa 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Inventor Juro Kobayashi 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Inventor Takayoshi Kaneda 1060 Takeda, Katsuta City, Ibaraki Prefecture Hitachi Koki Engineering Co., Ltd.
Claims (11)
と、該砥石取付け用固定側フランジと噛み合い回転を伝
達する砥石軸とを有した携帯用研削盤において、前記噛
み合い部分に適当な遊びを持たせることを特徴とする砥
石取付け用固定側フランジ。1. A portable grinder having a grindstone, a fixed-side flange for mounting the grindstone, and a grindstone shaft for meshing rotation with the fixed-side flange for mounting the grindstone, wherein an appropriate play is provided at the meshing portion. Fixed side flange for wheel attachment, which is characterized by being held.
軸との噛み合い形状がほぼ面接触になるようにした請求
項１記載の砥石取付け用固定側フランジ。2. A fixed-side flange for mounting a whetstone according to claim 1, wherein the fixed-side flange for mounting a whetstone is such that the meshing shape with the whetstone shaft is substantially in surface contact.
に、硬度の高い表面処理、又は部分焼入れを施した請求
項１又は請求項２記載の砥石取付け用固定側フランジ。3. The fixed-side flange for mounting a grindstone according to claim 1 or 2, wherein a surface treatment with high hardness or partial quenching is applied so that a portion in contact with the grindstone shaft is not worn.
して、砥石軸と回転方向の遊びが少ない、少なくともも
う一つのフランジを有し、該もう一つのフランジと前記
フランジ間を締結し必要に応じ締結を解除できることを
特徴とする請求項１又は請求項２記載の砥石取付け用固
定側フランジ。4. A flange having at least another flange adjacent to a surface opposite to a surface in contact with the grindstone and having little play in the rotational direction with respect to the grindstone shaft, and fastening between the other flange and the flange. The fixed-side flange for whetstone attachment according to claim 1 or 2, wherein the fastening can be released as necessary.
動可能にしたことを特徴とする請求項４記載の砥石取付
け用固定側フランジ。5. The fixed-side flange for mounting a grindstone according to claim 4, wherein the other flange is movable in the grindstone axial direction.
できる機構を有した請求項４又は請求項５記載の砥石取
付け用固定側フランジ。6. A fixed-side flange for mounting a grindstone according to claim 4 or 5, further comprising a mechanism capable of fixing the rotation of the grindstone shaft by releasing the fastening operation.
えられる請求項１記載の砥石取付け用固定側フランジ。7. The fixed-side flange for mounting a grindstone according to claim 1, wherein the size of the play in the rotational direction can be changed as required.
り砥石軸の回転を固定でき、且つ固定をも解除できる機
構を有した請求項１乃至請求項７のいずれか記載の砥石
取付け用固定側フランジ。8. A fixing means for mounting a grindstone according to any one of claims 1 to 7, further comprising a mechanism capable of fixing the rotation of the grindstone shaft by an operation of changing the amount of play in the rotating direction and also releasing the fixing. Side flange.
表面処理を行うか、又は摩擦係数の小さい材料を介在さ
せた請求項１又は請求項２記載の砥石取付け用固定側フ
ランジ。9. The fixed-side flange for mounting a grindstone according to claim 1 or 2, wherein a surface treatment having a small friction coefficient is performed on a portion in contact with the grindstone shaft, or a material having a small friction coefficient is interposed.
を低減するか又は耐久性を向上でき、或いは戻しトルク
を低減し且つ耐久性を向上させる円筒状部品を固着した
ことを特徴とする請求項１又は請求項３記載の砥石取付
け用固定側フランジ。10. A cylindrical part for reducing the returning torque or improving the durability, or fixing a cylindrical part for reducing the returning torque and improving the durability, to the inner diameter portion of the fixed side flange. The fixed-side flange for mounting a grindstone according to claim 1 or 3.
位に１枚以上の円盤状円筒形部品が回動可能に介在装着
されたことを特徴とする請求工１乃至請求項３のいずれ
か記載の砥石取付け用固定側フランジ。11. The method according to any one of claims 1 to 3, wherein one or more disk-shaped cylindrical parts are rotatably interposed at a portion contacting the end face of the grindstone shaft and receiving a tightening force. Fixed side flange for any of the above whetstones.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10059793A JPH06238557A (en) | 1992-12-25 | 1993-04-27 | Fixed side flange for installing grinding wheel |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34715292 | 1992-12-25 | ||
| JP4-347152 | 1992-12-25 | ||
| JP10059793A JPH06238557A (en) | 1992-12-25 | 1993-04-27 | Fixed side flange for installing grinding wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06238557A true JPH06238557A (en) | 1994-08-30 |
Family
ID=26441591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10059793A Withdrawn JPH06238557A (en) | 1992-12-25 | 1993-04-27 | Fixed side flange for installing grinding wheel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06238557A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1724059A3 (en) * | 2005-05-13 | 2007-02-14 | BLACK & DECKER INC. | Angle grinder |
| JP2012035388A (en) * | 2010-08-10 | 2012-02-23 | Disco Corp | Cutting device mounted with cutting blade, and mounting method of cutting blade |
| CN102814726A (en) * | 2011-06-10 | 2012-12-12 | S.T-Link有限公司 | Grinding device |
| WO2013065614A1 (en) * | 2011-11-01 | 2013-05-10 | 株式会社マキタ | Working tool |
| WO2013088770A1 (en) * | 2011-12-16 | 2013-06-20 | 豊田バンモップス株式会社 | Grinding wheel mounting apparatus |
| KR101304322B1 (en) * | 2012-11-23 | 2013-09-11 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Electric grinder |
| JPWO2013088770A1 (en) * | 2011-12-16 | 2015-04-27 | 豊田バンモップス株式会社 | Grinding wheel mounting device |
| KR101602295B1 (en) * | 2014-12-22 | 2016-03-10 | 한전케이피에스 주식회사 | Connecting device for variety cutting wheel of grinder |
| KR101954581B1 (en) * | 2018-09-12 | 2019-03-05 | 박효주 | Grinding apparatus being connected jaw and grinding pad by one touch method |
| JP2019155576A (en) * | 2018-03-16 | 2019-09-19 | 株式会社マキタ | Power tool |
| KR102037521B1 (en) * | 2018-12-28 | 2019-10-29 | 채성덕 | Grinder holder that polishing pad can be attached or detached by one-action |
| WO2020175853A1 (en) * | 2019-02-25 | 2020-09-03 | 채성덕 | Grinder holder enabling polishing pad to be attached thereto and detached therefrom by one touch |
| KR20200132188A (en) * | 2019-05-16 | 2020-11-25 | 박효주 | Grinding apparatus being being connected jaw and grinding pad by one touch method |
-
1993
- 1993-04-27 JP JP10059793A patent/JPH06238557A/en not_active Withdrawn
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1724059A3 (en) * | 2005-05-13 | 2007-02-14 | BLACK & DECKER INC. | Angle grinder |
| JP2012035388A (en) * | 2010-08-10 | 2012-02-23 | Disco Corp | Cutting device mounted with cutting blade, and mounting method of cutting blade |
| CN102814726A (en) * | 2011-06-10 | 2012-12-12 | S.T-Link有限公司 | Grinding device |
| JP2012254507A (en) * | 2011-06-10 | 2012-12-27 | St Link:Kk | Polishing device |
| WO2013065614A1 (en) * | 2011-11-01 | 2013-05-10 | 株式会社マキタ | Working tool |
| CN104010767A (en) * | 2011-12-16 | 2014-08-27 | 丰田万磨株式会社 | Grinding wheel mounting apparatus |
| WO2013088574A1 (en) * | 2011-12-16 | 2013-06-20 | 豊田バンモップス株式会社 | Grinding wheel mounting apparatus |
| WO2013088770A1 (en) * | 2011-12-16 | 2013-06-20 | 豊田バンモップス株式会社 | Grinding wheel mounting apparatus |
| JPWO2013088770A1 (en) * | 2011-12-16 | 2015-04-27 | 豊田バンモップス株式会社 | Grinding wheel mounting device |
| JPWO2013088574A1 (en) * | 2011-12-16 | 2015-04-27 | 豊田バンモップス株式会社 | Grinding wheel mounting device |
| CN104010767B (en) * | 2011-12-16 | 2018-05-25 | 丰田万磨株式会社 | The erecting device of emery wheel |
| KR101304322B1 (en) * | 2012-11-23 | 2013-09-11 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Electric grinder |
| KR101602295B1 (en) * | 2014-12-22 | 2016-03-10 | 한전케이피에스 주식회사 | Connecting device for variety cutting wheel of grinder |
| JP2019155576A (en) * | 2018-03-16 | 2019-09-19 | 株式会社マキタ | Power tool |
| KR101954581B1 (en) * | 2018-09-12 | 2019-03-05 | 박효주 | Grinding apparatus being connected jaw and grinding pad by one touch method |
| KR102037521B1 (en) * | 2018-12-28 | 2019-10-29 | 채성덕 | Grinder holder that polishing pad can be attached or detached by one-action |
| WO2020175853A1 (en) * | 2019-02-25 | 2020-09-03 | 채성덕 | Grinder holder enabling polishing pad to be attached thereto and detached therefrom by one touch |
| KR20200132188A (en) * | 2019-05-16 | 2020-11-25 | 박효주 | Grinding apparatus being being connected jaw and grinding pad by one touch method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000704 |