JPH0154575B2 - - Google Patents
Info
- Publication number
- JPH0154575B2 JPH0154575B2 JP57146772A JP14677282A JPH0154575B2 JP H0154575 B2 JPH0154575 B2 JP H0154575B2 JP 57146772 A JP57146772 A JP 57146772A JP 14677282 A JP14677282 A JP 14677282A JP H0154575 B2 JPH0154575 B2 JP H0154575B2
- Authority
- JP
- Japan
- Prior art keywords
- sliding sleeve
- groove
- release device
- clutch
- tab
- 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.)
- Expired
Links
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
- F16D23/14—Clutch-actuating sleeves or bearings; Actuating members directly connected to clutch-actuating sleeves or bearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Operated Clutches (AREA)
Description
【発明の詳細な説明】
この発明は、プラスチツク製摺動スリーブのボ
ス体に、スナツプ連結によつて固定されるたとえ
ばクラツチの操作レバーのための接触面をもつ少
なくとも１つの環状の圧接板を有する自動車クラ
ツチ用のクラツチ解放装置用摺動スリーブに関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The invention comprises at least one annular pressure plate with a contact surface for an actuating lever of a clutch, for example, which is fixed by a snap connection on the hub body of a plastic sliding sleeve. The present invention relates to a sliding sleeve for a clutch release device for an automobile clutch.
すでにプラスチツク製のボス体をもつ摺動スリ
ーブが知られているが、該摺動スリーブにおいて
は、クラツチの操作レバーが金属製の圧接板に接
しており、この圧接板は、背後に成形された互い
に平行な２つの突出部の掛止によつて固定される
（DE−OS2240715）。この公知の摺動スリーブは、
突出部が長時間にわたる持続的な荷重によつて折
れることがあり、圧接板の固定が不可能となると
いう欠点がある。 A sliding sleeve with a boss body made of plastic is already known, but in this sliding sleeve, the operating lever of the clutch is in contact with a metal pressure plate, and this pressure plate has a metal pressure plate molded behind it. It is fixed by the latching of two mutually parallel projections (DE-OS2240715). This known sliding sleeve is
There is a disadvantage that the protruding portion may break due to a sustained load over a long period of time, making it impossible to fix the pressure contact plate.
この発明の課題は、安価に作れ、容易に組立て
られる部品から成り、それらが固く組み合わさ
れ、ボス材料が収縮してもゆるんだりはずしたり
しないような冒頭にあげた摺動スリーブを提供す
ることである。 The object of the invention is to provide a sliding sleeve as mentioned at the outset, which consists of parts that are inexpensive to make and easy to assemble, which are tightly interlocked and do not loosen or come off even when the boss material shrinks. be.
この課題はこの発明によれば、圧接板の内周に
半径方向内側に延出するタブを具備せしめ、摺動
スリーブはそのボス体の外面に軸方向に延びる溝
が形成され、該溝はその側壁に弾性を有する突出
部が設けられ、上記タブが溝内に圧入されると共
に突出部によつて軸方向位置決めされていること
によつて解決される。 This problem can be solved according to the present invention by providing a tab extending radially inward on the inner periphery of the pressure contact plate, and forming a groove extending axially in the outer surface of the boss body of the sliding sleeve. The problem is solved in that the side wall is provided with an elastic projection, and the tab is pressed into the groove and is axially positioned by the projection.
この発明のほかの有利な特徴によれば、摺動ス
リーブボス体の外面に軸方向にのび直径方向に向
かい合つた少なくとも２つの溝を備えており、そ
の互いに向かい合つた溝の側壁は摺動スリーブの
前面位置から出発して上記側壁の間隔がフランジ
の前面の直前まで軸方向に進むにしたがい収束
し、その後圧力板のタブのための平行にのびる支
持面の位置まで拡大し、その際、溝面の成形によ
つて形成された突出部の間の間隔は最も狭い個所
でタブの幅より小さくなつている。 According to another advantageous feature of the invention, the outer surface of the sliding sleeve boss body is provided with at least two axially extending and diametrically opposed grooves, the side walls of the mutually opposite grooves being arranged in the sliding sleeve boss body. Starting from the front position of the sleeve, the spacing of the side walls converges as it progresses axially to just before the front face of the flange, and then widens to the position of the parallel supporting surface for the tab of the pressure plate, with The spacing between the protrusions formed by molding the groove surfaces is smaller than the width of the tab at its narrowest point.
この発明の実施例について次の記述で詳しく説
明する。 Embodiments of the invention will be described in detail in the following description.
第１図ないし第４図に示したクラツチ解放装置
は、プラスチツク製の摺動スリーブ１と、半径方
向で移動できるように摺動スリーブ１のフランジ
３に接しているクラツチスラスト軸受２とから成
る。クラツチスラスト軸受２の外輪４と内輪５は
薄板で作られ、玉６のための軌道を有している。
外輪４クラツチの板ばね（図示されていない）の
ための凸面に成形された接触フランジ７をもち、
軸方向内側に向いた縁８を備えている。この縁８
はその端で半径方向外側へ縁曲げされ、内輪５背
後で僅かな遊びをもつて掛止しているので、外輪
４、内輪５、玉６および保持器９は分離すること
なくユニツトを形成している。半径方向外側に縁
曲げした外輪４の縁１０上には薄板のカバー円板
１１が取付けられており、このカバー円板１１は
内輪５の軸方向に延びる胴面の近くまで達し、内
輪５とともにラビリンス間隙を形成している。ク
ラツチスラスト軸受２は内輪５の半径方向外側に
曲げたフランジ１２で摺動スリーブ１に接してお
り、摺動スリーブ１の面はクラツチスラスト軸受
２と解放レバー（図示されていない）の接触に適
するよう外装されている。内輪５の穴の中には制
動リング１３が配設されており、その弾性を有し
て形成された舌片１４が遊びをもつて摺動スリー
ブ１の胴面に接し、クラツチスラスト軸受２の半
径方向の運動が一定の遊びを超えると、これを弾
性的に戻すべく、クラツチスラスト軸受２の摺動
スリーブ１に対する相対運動を制動する。 The clutch release device shown in FIGS. 1 to 4 consists of a sliding sleeve 1 made of plastic and a clutch thrust bearing 2 which rests on a flange 3 of the sliding sleeve 1 for radial movement. The outer ring 4 and the inner ring 5 of the clutch thrust bearing 2 are made of thin plates and have a raceway for the balls 6.
with a convexly shaped contact flange 7 for the leaf spring (not shown) of the outer ring 4 clutch;
It has an axially inwardly directed edge 8. This edge 8
is bent radially outward at its end and is latched behind the inner ring 5 with a slight play, so the outer ring 4, the inner ring 5, the balls 6 and the retainer 9 form a unit without being separated. ing. A thin cover disk 11 is mounted on the edge 10 of the outer ring 4 which is bent radially outward. It forms a labyrinth gap. The clutch thrust bearing 2 is in contact with the sliding sleeve 1 at a radially outwardly bent flange 12 of the inner ring 5, the surface of the sliding sleeve 1 being suitable for contact between the clutch thrust bearing 2 and the release lever (not shown). The exterior looks like that. A brake ring 13 is disposed in the hole of the inner ring 5, and its elastic tongue piece 14 comes into contact with the body surface of the sliding sleeve 1 with play, and the brake ring 13 is arranged in the hole of the inner ring 5. If the radial movement exceeds a certain play, the relative movement of the clutch thrust bearing 2 with respect to the sliding sleeve 1 is damped in order to elastically restore this play.
プラスチツク製の摺動スリーブ１は、ボス体１
５と一体的に成形されたフランジ部分３とから成
り、クラツチ側に注入または射出成形により固定
される横断面がＬ字形の薄板差込み１６を備えて
おり、その軸方向の脚１７は周囲に分布して配さ
れたいくつかの穴１８が設けられているので、薄
板差込み１６は射出または注入成形の際に流入す
るプラスチツクによつて固くボス体１５の中で固
定される。薄板差込み１６の半径方向の脚２０の
接触面１９は露呈しているので、薄板差込み１６
でクラツチスラスト軸受２の動作による摩耗は少
なくなる。接触面１９に続いて薄板差込み１６の
縁は外方に曲げられ、摺動スリーブ１の径より突
出している。薄板差込み１６の屈曲部分２１は、
たとえば４つの切欠部（図示されていない）を備
えており、その中にフランジ１２の周囲に直径に
向かい合つて配設された２つずつのタブ２２が固
定側となる内輪５の円周方向のずれ防止のために
かみ合つている。クラツチとは反対の側では摺動
スリーブ１のフランジ３にクラツチの操作レバー
（図示されていない）のための接触面２４をもつ
圧接板２３が接しており、該圧接板２３はその内
径周囲に分布され半径方向内側に向いた４つのタ
ブ２５を有している。これらのタブ２５は摺動ス
リーブ１のボス体１５の外面に形成された軸方向
に延びる溝２６の中に圧入されている。溝２６の
互いに向き合つた側壁２７，２８の間隔は、摺動
スリーブ１の前面位置２９から出発して軸方向で
フランジ３の前面３０の直前位置までは収束し、
その後圧接板２３のタブ２５のための平行にのび
る支持面３１の位置まで拡大するので、互いに向
かい合つた突出部３２が生じる。突出部３２がよ
り容易に弾性的に撓めるように、溝２６に並んで
平行に延る逃げ溝３３を備え、側壁２７，２８を
半径方向で互いに角度をもつて形成して、側壁２
７，２８の間隔が溝底３４の位置で最大となるよ
うにすると有利である。圧接板２３を摺動スリー
ブ１の胴面上に軸方向に押込む際に、該圧接板２
３は突出部３２を弾性的にわきへ押し出しながら
進みついに溝２６の最も狭い箇所３５に達する。
この狭い箇所を乗り越えた後に突出部３２は原形
に復帰し、圧接板２３を摺動スリーブ１のフラン
ジ３に接してから溝２６の平行な支持面３１の間
で軸方向に位置決めする。その際、圧接板２３の
タブ２５が溝２６の中に圧入された後、プラスチ
ツクが収縮しても結合がゆるだりはずれないよう
に、溝２６の支持面３１間の間隔を選定すること
が望まれる。 A plastic sliding sleeve 1 is attached to a boss body 1.
5 and an integrally molded flange part 3, it is provided with a sheet metal insert 16 having an L-shaped cross section and fixed by injection or injection molding on the clutch side, the axial legs 17 of which are distributed around the periphery. Due to the presence of several holes 18 arranged in a circular manner, the sheet insert 16 is firmly fixed in the hub body 15 by the plastic flowing in during injection or injection molding. The contact surface 19 of the radial leg 20 of the laminate insert 16 is exposed, so that the laminate insert 16
Therefore, the wear caused by the operation of the clutch thrust bearing 2 is reduced. Adjacent to the contact surface 19 , the edge of the sheet metal insert 16 is bent outwards and projects beyond the diameter of the sliding sleeve 1 . The bent portion 21 of the thin plate insert 16 is
For example, it is provided with four notches (not shown), in which two tabs 22 are arranged diametrically opposite each other around the flange 12 in the circumferential direction of the inner ring 5 on the fixed side. They are interlocked to prevent slippage. On the side facing away from the clutch, the flange 3 of the sliding sleeve 1 is adjoined by a pressure plate 23 with a contact surface 24 for the actuating lever of the clutch (not shown), which pressure plate 23 is fitted around its inner diameter. It has four tabs 25 distributed and oriented radially inward. These tabs 25 are press-fitted into axially extending grooves 26 formed on the outer surface of the boss body 15 of the sliding sleeve 1. The spacing between the mutually facing side walls 27, 28 of the groove 26 converges in the axial direction starting from the front face position 29 of the sliding sleeve 1 up to a position just before the front face 30 of the flange 3;
Thereafter, it widens up to the position of the parallel support surfaces 31 for the tabs 25 of the pressure plate 23, so that projections 32 facing each other are formed. In order to make the protrusion 32 more easily elastically deflectable, a relief groove 33 is provided which extends parallel to and parallel to the groove 26, and the side walls 27, 28 are formed at an angle to each other in the radial direction, so that the side wall 2
It is advantageous if the distance between 7 and 28 is greatest at the groove bottom 34. When pressing the pressure contact plate 23 onto the body surface of the sliding sleeve 1 in the axial direction, the pressure contact plate 2
3 advances while elastically pushing the protrusion 32 aside, and finally reaches the narrowest point 35 of the groove 26.
After overcoming this narrow point, the protrusion 32 returns to its original shape, brings the pressure contact plate 23 into contact with the flange 3 of the sliding sleeve 1, and then positions it in the axial direction between the parallel support surfaces 31 of the groove 26. In this case, it is desirable to select the spacing between the supporting surfaces 31 of the grooves 26 so that the connection does not loosen or come loose even if the plastic shrinks after the tabs 25 of the pressure contact plate 23 are press-fitted into the grooves 26. It will be done.
上記実施例は、この発明によるすべりスリーブ
の一例にすぎない。個々の部品の設計の変更はこ
の発明の範囲内で難なく可能である。 The embodiment described above is only an example of a sliding sleeve according to the invention. Changes in the design of individual parts are easily possible within the scope of the invention.
第１図はクラツチとは反対の側にスナツプ結合
された圧接板をもつクラツチスラスト軸受つきの
摺動スリーブの断面図、第２図は第１図によるク
ラツチ解放装置の側面図、第３図はクラツチ解放
装置の平面図、第４図はクラツチスラスト軸受の
ための接触面の範囲での摺動スリーブの一部拡大
図である。
１……摺動スリーブ、２……クラツチスラスト
軸受、３……フランジ、４……外輪、５……内
輪、１６……薄板差込み、１７，２０……脚、１
８……穴、１９……接触面、２１……屈曲部分、
２２，２５……タブ、２３……圧接板、２６……
溝、２７，２８……側壁、２９，３０……前面、
３１……支持面、３２……突出部、３３……逃げ
溝、３４……溝底、３５……最も狭い箇所。
1 is a sectional view of a sliding sleeve with a clutch thrust bearing with a pressure plate snap-connected on the side opposite the clutch; FIG. 2 is a side view of the clutch release device according to FIG. 1; and FIG. The top view of the release device, FIG. 4, is a partially enlarged view of the sliding sleeve in the area of the contact surface for the clutch thrust bearing. 1... Sliding sleeve, 2... Clutch thrust bearing, 3... Flange, 4... Outer ring, 5... Inner ring, 16... Thin plate insertion, 17, 20... Leg, 1
8... Hole, 19... Contact surface, 21... Bent part,
22, 25...Tab, 23...Pressure plate, 26...
Groove, 27, 28... side wall, 29, 30... front surface,
31...Supporting surface, 32...Protrusion, 33...Escape groove, 34...Groove bottom, 35...Narrowest point.
Claims (1)
ボス体の外周にスナツプ結合によつて固定される
例えばクラツチの操作レバーのための接触面をも
つ少なくとも１つの環状の圧接板とを有する自動
車クラツチ用のクラツチ解放装置用摺動スリーブ
において、 圧接板２３がその内周に半径方向内側に延出す
るタブ２５を備えており、 摺動スリーブ１はそのボス体１５の外面に軸方
向に延びる溝２６が形成され、該溝はその側壁に
弾性を有する突出部３２が設けられ、上記タブ２
５が溝２６内に圧入されると共に突出部３２によ
つて軸方向位置決めされていることを特徴とする
摺動スリーブ。 ２ ボス体１５の外面に軸方向に延び直径方向に
向かい合つた少なくとも２つの溝２６を備えてい
ることを特徴とする特許請求の範囲第１項記載の
クラツチ解放装置用摺動スリーブ。 ３ 溝２６の互いに向かい合つた側壁２７，２８
が突出部３２の形成のために、摺動スリーブ１の
前面位置２９から出発して上記側壁２７，２８の
間隔がフランジ３の前面３０の直前位置まで軸方
向に進むにしたがい収束し、その後圧接板２３の
タブ２５のための平行にのびる支持面３１の位置
まで拡大しており、突出部３２間の内法間隔は最
も狭い箇所３５でタブ２５の幅より小さいことを
特徴とする特許請求の範囲第１項または第２項の
１つに記載のクラツチ解放装置用摺動スリーブ。 ４ 溝２６の側壁２７，２８が半径方向で傾斜し
て形成され、側壁２７，２８相互の間隔は溝底３
４の位置で最大となるようにしたことを特徴とす
る特許請求の範囲第１項ないし第３項のいずれか
１つに記載のクラツチ解放装置用摺動スリーブ。 ５ 溝２６の側壁に並んで逃げ溝３３が設けられ
ていることを特徴とする特許請求の範囲第１項な
いし第４項のいずれか１つに記載のクラツチ解放
装置摺動スリーブ。 ６ 摺動スリーブ１がクラツチ側に注入または射
出により固定される望ましくはＬ字形の薄板差込
み１６を備えており、その半径方向に延出する脚
２０の接触面１９は摺動スリーブ１のフランジ３
の径より突出しており、その外縁は屈曲部分２１
を有し、該屈曲部分２１は、固定された内輪５に
配置されたタブ２２を受け入れるための切欠部を
もつことを特徴とする特許請求の範囲第１項ない
し第５項のいずれか１つに記載のクラツチ解放装
置用摺動スリーブ。 ７ 薄板差込み１６の軸方向の脚１７が穴１８を
備えていることを特徴とする特許請求の範囲第６
項記載のクラツチ解放装置用摺動スリーブ。Claims: 1. A boss body of a plastic sliding sleeve and at least one annular pressure plate having a contact surface for, for example, an operating lever of a clutch, which is fixed by a snap connection on the outer periphery of the boss body. In the sliding sleeve for a clutch release device for an automobile clutch, the pressing plate 23 is provided with a tab 25 extending radially inward on its inner periphery, and the sliding sleeve 1 is provided with a tab 25 extending radially inward on the inner circumference thereof, An axially extending groove 26 is formed, which groove is provided with an elastic projection 32 on its side wall, and the tab 2
5 is press-fitted into the groove 26 and is axially positioned by the projection 32. 2. The sliding sleeve for a clutch release device according to claim 1, wherein the outer surface of the boss body 15 is provided with at least two grooves 26 extending in the axial direction and facing each other in the diametrical direction. 3 Side walls 27, 28 facing each other of the groove 26
In order to form the protrusion 32, the distance between the side walls 27, 28 starts from the front surface 29 of the sliding sleeve 1 and converges as it advances in the axial direction to a position just in front of the front surface 30 of the flange 3, and then press-fits. The plate 23 is enlarged to the position of the parallel supporting surface 31 for the tab 25, and the inner spacing between the protrusions 32 is smaller than the width of the tab 25 at the narrowest point 35. Sliding sleeve for a clutch release device according to one of the claims 1 or 2. 4 The side walls 27 and 28 of the groove 26 are formed to be inclined in the radial direction, and the distance between the side walls 27 and 28 is equal to the groove bottom 3.
A sliding sleeve for a clutch release device according to any one of claims 1 to 3, characterized in that the sliding sleeve is maximized at position 4. 5. The clutch release device sliding sleeve according to any one of claims 1 to 4, characterized in that a relief groove 33 is provided along the side wall of the groove 26. 6. The sliding sleeve 1 is provided with a preferably L-shaped sheet insert 16 fixed by injection or injection on the clutch side, the contact surface 19 of the radially extending leg 20 of which is attached to the flange 3 of the sliding sleeve 1.
The outer edge of the bent portion 21 protrudes from the diameter of the
and the bent portion 21 has a notch for receiving a tab 22 arranged on the fixed inner ring 5. A sliding sleeve for a clutch release device as described in . 7. Claim 6, characterized in that the axial leg 17 of the sheet insert 16 is provided with a hole 18.
A sliding sleeve for a clutch release device as described in .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8128137.4 | 1981-08-27 | ||
| DE19818128137U DE8128137U1 (en) | 1981-08-27 | 1981-08-27 | SLIDING SLEEVE FOR CLUTCH RELEASE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5846233A JPS5846233A (en) | 1983-03-17 |
| JPH0154575B2 true JPH0154575B2 (en) | 1989-11-20 |
Family
ID=6731568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57146772A Granted JPS5846233A (en) | 1981-08-27 | 1982-08-24 | Sliding sleeve for clutch releaser |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5846233A (en) |
| DE (1) | DE8128137U1 (en) |
| FR (1) | FR2512142A1 (en) |
| GB (1) | GB2107818B (en) |
| IT (2) | IT8222735V0 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164528U (en) * | 1984-10-04 | 1986-05-01 | ||
| DE3535263A1 (en) * | 1985-10-03 | 1987-04-09 | Schaeffler Waelzlager Kg | SLIDING SLEEVE MADE OF POLYMER MATERIAL FOR CLUTCH RELEASE BEARING |
| JPS63246517A (en) * | 1987-03-31 | 1988-10-13 | Koyo Seiko Co Ltd | Release bearing unit |
| JPH0822982B2 (en) * | 1988-08-05 | 1996-03-06 | 日本ペイント株式会社 | Paint composition |
| FR2759437B1 (en) * | 1997-02-13 | 1999-05-07 | Skf France | CLUTCH MANEUVER WITH ELASTIC SELF-ALIGNMENT MEMBER |
| RU184971U1 (en) * | 2018-08-30 | 2018-11-15 | Общество с ограниченной ответственностью "Валео Сервис" | CLUTCH SWITCH |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2167198A5 (en) * | 1972-01-10 | 1973-08-24 | Ferodo Sa | |
| FR2389799A1 (en) * | 1977-05-05 | 1978-12-01 | Ferodo Sa | Thrust bearing for clutch - has abutment with central bore holding ball bearing in position |
| FR2461157A1 (en) * | 1979-07-06 | 1981-01-30 | Ferodo Sa | RELEASE STOP |
| DE8004785U1 (en) * | 1980-02-22 | 1980-05-14 | Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt | SLIDING SLEEVE FOR CLUTCH RELEASE |
-
1981
- 1981-08-27 DE DE19818128137U patent/DE8128137U1/en not_active Expired
-
1982
- 1982-08-24 JP JP57146772A patent/JPS5846233A/en active Granted
- 1982-08-25 FR FR8214619A patent/FR2512142A1/en active Granted
- 1982-08-26 IT IT8222735U patent/IT8222735V0/en unknown
- 1982-08-26 IT IT8222996A patent/IT1210927B/en active
- 1982-08-27 GB GB08224701A patent/GB2107818B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5846233A (en) | 1983-03-17 |
| IT8222996A0 (en) | 1982-08-26 |
| GB2107818B (en) | 1985-07-03 |
| IT8222735V0 (en) | 1982-08-26 |
| FR2512142A1 (en) | 1983-03-04 |
| FR2512142B1 (en) | 1984-12-21 |
| IT1210927B (en) | 1989-09-29 |
| DE8128137U1 (en) | 1982-02-04 |
| GB2107818A (en) | 1983-05-05 |
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