JPH0527825Y2 - - Google Patents
Info
- Publication number
- JPH0527825Y2 JPH0527825Y2 JP1988005238U JP523888U JPH0527825Y2 JP H0527825 Y2 JPH0527825 Y2 JP H0527825Y2 JP 1988005238 U JP1988005238 U JP 1988005238U JP 523888 U JP523888 U JP 523888U JP H0527825 Y2 JPH0527825 Y2 JP H0527825Y2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- opening
- heaters
- closing
- furnace shell
- 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 - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005219 brazing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Description
【考案の詳細な説明】
産業上の利用分野
本考案は焼き入れ、ろう付け、焼結その他の熱
処理を行う熱処理炉に装備される熱処理炉用加熱
ヒータに関する。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a heater for a heat treatment furnace that is installed in a heat treatment furnace that performs quenching, brazing, sintering, and other heat treatments.
従来の技術
第５図は焼き入れ炉の簡略断面図、第６図は第
５図のＢ−Ｂ線による断面図である。BACKGROUND ART FIG. 5 is a simplified sectional view of a hardening furnace, and FIG. 6 is a sectional view taken along line BB in FIG.
開放両端面に開閉扉１１Ａ，１１Ｂを備える炉
殻１０の内部には、開閉扉１１Ａ，１１Ｂを開け
て挿入された被処理物３０を載置する炉床（図示
せず）が設けられており、この被処理物３０の回
りにはロツドヒータ７０Ａ〜７０Ｈが設けられて
いる。また炉殻１０の外部に漏れるロツドヒータ
７０Ａ〜７０Ｈからの輻射熱を遮蔽するために、
炉殻１０とロツドヒータ７０Ａ〜７０Ｈとの間に
は筒体状断熱壁２０が設けられており、一方開閉
扉１１Ａ，１１Ｂの裏面にも円盤状断熱壁２１
Ａ，２１Ｂが夫々設けられている。更に詳しく説
明すると、図外の電極を介して電源供給されてい
るロツドヒータ７０Ａ〜７０Ｈは、被処理物３０
を中心とした45度ピツチで炉殻１０の長手方向に
夫々合計８本配設されており、これで被処理物３
０の焼き入れが行われるような構成となつてい
る。 A hearth (not shown) is provided inside the furnace shell 10, which has opening/closing doors 11A, 11B on both open end faces, on which a workpiece 30 inserted by opening the opening/closing doors 11A, 11B is placed. Rod heaters 70A to 70H are provided around the object 30 to be processed. In addition, in order to shield the radiant heat from the rod heaters 70A to 70H leaking to the outside of the furnace shell 10,
A cylindrical insulating wall 20 is provided between the furnace shell 10 and the rod heaters 70A to 70H, and a disc-shaped insulating wall 21 is also provided on the back side of the opening/closing doors 11A and 11B.
A and 21B are provided respectively. To explain in more detail, the rod heaters 70A to 70H, which are supplied with power through electrodes (not shown), are connected to the workpiece 30.
A total of 8 rods are arranged in the longitudinal direction of the furnace shell 10 at a pitch of 45 degrees with
The structure is such that zero hardening is performed.
考案が解決しようとする課題
しかしながら、上記従来例による場合には、最
近の熱処理炉の大型化に対応する上で次に述べる
ような問題がある。つまり被処理物３０の側周面
はこれに対向するロツドヒータ７０Ａ〜７０Ｈに
より均等加熱されているものの、対向するヒータ
が設けられていない被処理物３０の両端面は、ロ
ツドヒータ７０Ａ〜７０Ｈの両端部からの輻射熱
により加熱されているに過ぎず、この部の温度分
布が被処理物３０の側周面に比べて不均一で、し
かもこの不均一が熱処理炉の大型化とともに顕著
となるからである。Problems to be Solved by the Invention However, in the case of the conventional example described above, there are problems as described below in dealing with the recent increase in the size of heat treatment furnaces. In other words, although the side peripheral surface of the workpiece 30 is uniformly heated by the opposing rod heaters 70A to 70H, both end faces of the workpiece 30, which are not provided with opposing heaters, are heated at both ends of the rod heaters 70A to 70H. This is because the temperature distribution in this area is not uniform compared to the side peripheral surface of the workpiece 30, and this non-uniformity becomes more noticeable as the heat treatment furnace becomes larger. .
一方において円盤状断熱壁２１Ａ，２１Ｂの裏
面にもヒータを夫々配設すれば、被処理物３０の
両端面も均等加熱されることになるのだが、ヒー
タ取付部材、電源引き込み用電極等を別に必要と
することから、大幅にコスト高になるという欠点
がある。 On the other hand, if heaters are installed on the back surfaces of the disk-shaped heat insulating walls 21A and 21B, both end surfaces of the object to be processed 30 will be heated evenly, but the heater mounting members, power supply lead-in electrodes, etc. This has the disadvantage of significantly increasing costs.
本考案は上記事情に鑑みて創案されたものであ
り、低コストで熱処理炉の大型化に対応すること
ができる熱処理炉用加熱ヒータを提供することを
目的とする。 The present invention was devised in view of the above-mentioned circumstances, and an object of the present invention is to provide a heater for a heat treatment furnace that can be used at a low cost and correspond to an increase in the size of the heat treatment furnace.
課題を解決するための手段
本考案にかかる熱処理炉用加熱ヒータは、開閉
扉が炉殻の端面に開閉自在な構造である熱処理炉
の炉殻内に装備される加熱ヒータであつて、炉殻
の奥行方向に向けて配設された固定ヒータと、一
端が固定ヒータの炉殻端面側の一端にヒンジで連
結されており炉殻の端面方向から炉殻の奥行方向
にかけて開閉自在に設けられた開閉ヒータとを具
備することを特徴としている。Means for Solving the Problems The heater for a heat treatment furnace according to the present invention is a heater installed in the furnace shell of a heat treatment furnace having a structure in which an opening/closing door can be freely opened and closed on the end face of the furnace shell. One end of the fixed heater is connected to one end of the fixed heater on the end surface of the furnace shell by a hinge, and the heater is provided so as to be openable and closable from the end surface of the furnace shell to the depth direction of the furnace shell. It is characterized by being equipped with an opening/closing heater.
作 用
開閉扉、開閉ヒータを共に開けて、被処理物を
炉殻の内部にセツトした後に、開閉ヒータと開閉
扉を閉じて、開閉ヒータ及び固定ヒータに給電す
ると、被処理物の側周面は固定ヒータからの輻射
熱により、一方被処理物の端面は開閉ヒータから
の輻射熱により夫々加熱され、これで被処理物の
均等加熱が行われることになる。Operation After opening both the opening/closing door and opening/closing heater and setting the workpiece inside the furnace shell, closing the opening/closing heater and opening/closing door and supplying power to the opening/closing heater and fixed heater, the side peripheral surface of the workpiece is heated by radiant heat from the fixed heater, and the end face of the object to be processed is heated by radiant heat from the opening/closing heater, thereby uniformly heating the object.
実施例
以下、本考案にかかる熱処理炉用加熱ヒータの
実施例を図面を参照して説明する。第１図は焼き
入れ炉の簡略断面図、第２図は第１図のＡ−Ａ線
による矢視図、第３図は固定ヒータ及び開閉ヒー
タの斜視図である。Embodiments Hereinafter, embodiments of the heater for a heat treatment furnace according to the present invention will be described with reference to the drawings. FIG. 1 is a simplified sectional view of the quenching furnace, FIG. 2 is a view taken along line A--A in FIG. 1, and FIG. 3 is a perspective view of a fixed heater and an opening/closing heater.
円筒状の炉殻１０の開放両端面には、開閉扉１
１Ａ，１１Ｂが夫々設けられており、開閉扉１１
Ａ，１１Ｂの裏面にはグラフアイト等からなる円
盤状断熱壁２１Ａ，２１Ｂが夫々設けられてい
る。一方炉殻１０の内部には、円盤状断熱壁２１
Ａ，２１Ｂと同じ素材からなる筒体状断熱壁２０
が設けられており、開閉扉１１Ａ，１１Ｂが閉じ
た状態において筒体状断熱壁２０の開放両端面が
円盤状断熱壁２１Ａ，２１Ｂでもつて夫々閉合さ
れるような構成となつている。この筒体状断熱壁
２０の下部には、開閉扉１１Ａ，１１Ｂを介して
挿入された被処理物３０を載置する炉床（図示せ
ず）が設けられており、この被処理物３０を中心
とした回りには、グラフアイト製ロツドヒータで
ある固定ヒータ４０Ａ〜４０Ｈ等が夫々設けられ
ている。なお、図示されていないが、炉殻１０に
は被処理物３０を焼き入れするに必要な真空排気
装置等が接続されている。 Opening/closing doors 1 are provided on both open end surfaces of the cylindrical furnace shell 10.
1A and 11B are respectively provided, and the opening/closing door 11
Disc-shaped heat insulating walls 21A and 21B made of graphite or the like are provided on the back surfaces of A and 11B, respectively. On the other hand, inside the furnace shell 10, a disc-shaped heat insulating wall 21 is provided.
Cylindrical heat insulating wall 20 made of the same material as A and 21B
are provided, and the structure is such that when the opening/closing doors 11A, 11B are closed, both open end surfaces of the cylindrical heat insulating wall 20 are closed by the disc-shaped heat insulating walls 21A, 21B, respectively. A hearth (not shown) is provided at the bottom of the cylindrical heat insulating wall 20, on which the object 30 inserted through the opening/closing doors 11A, 11B is placed. Fixed heaters 40A to 40H, which are graphite rod heaters, are provided around the center. Although not shown, the furnace shell 10 is connected to a vacuum evacuation device and the like necessary for hardening the workpiece 30.
固定ヒータ４０Ａ〜４０Ｈは、筒体状断熱壁２
０の内面に炉殻１０の長手方向に向けて合計８本
固着されており、第２図に示すように、被処理物
３０の下面を固定ヒータ４０Ａ，４０Ｂにより、
被処理物３０の図中右側面を固定ヒータ４０Ｃ，
４０Ｄにより、被処理物３０の上面を固定ヒータ
４０Ｅ，４０Ｆにより、被処理物３０の図中左側
面を固定ヒータ４０Ｇ，４０Ｈにより夫々対向加
熱するような構成となつている。つまり固定ヒー
タ４０Ａ〜４０Ｈは、全体として被処理物３０の
側周面を加熱するものであるが、被処理物３０の
両端面を加熱するものとしては、固定ヒータ４０
Ｃ，４０Ｄの両端部に夫々設けられている開閉ヒ
ータ５０Ａ，５０Ｂがある。なお、図示されてい
ないが、固定ヒータ４０Ａ〜４０Ｈは所定の三相
結線でもつて互いに接続され、しかも炉殻１０、
筒状体断熱壁２０を貫通した電源引き込み用電極
と接続されており、これで固定ヒータ４０Ａ〜４
０Ｈ等の三相電源供給が行われている。 The fixed heaters 40A to 40H are connected to the cylindrical heat insulating wall 2.
A total of eight heaters are fixed to the inner surface of the furnace shell 10 in the longitudinal direction of the furnace shell 10, and as shown in FIG.
A heater 40C is fixed to the right side of the workpiece 30 in the figure.
40D, the upper surface of the object to be processed 30 is heated by fixed heaters 40E and 40F, and the left side surface of the object to be processed 30 in the drawing is heated by fixed heaters 40G and 40H, respectively. In other words, the fixed heaters 40A to 40H heat the side peripheral surface of the object 30 as a whole, but the fixed heater 40 heats both end surfaces of the object 30.
There are open/close heaters 50A and 50B provided at both ends of C and 40D, respectively. Although not shown, the fixed heaters 40A to 40H are connected to each other through a predetermined three-phase connection, and the furnace shell 10,
It is connected to a power supply lead-in electrode that penetrates the cylindrical heat insulating wall 20, and this connects the fixed heaters 40A to 4.
Three-phase power supply such as 0H is provided.
開閉ヒータ５０Ａ，５０Ｂは、固定ヒータ４０
Ｃ，４０Ｄの両端部にヒンジ機構で開閉自在にな
されているもので、開閉ヒータ５０Ａは、グラフ
アイト製ロツドヒータであるヒータ５１Ａ，５２
Ａ，５３Ａから構成されており、開閉ヒータ５０
Ｂも同じくヒータ５１Ｂ，５２Ｂ，５３Ｂから構
成されている。つまり開閉ヒータ５０Ａ，５０Ｂ
は、開閉扉１１Ａ，１１Ｂを開けて被処理物３０
を炉殻１０の内部に挿入する際における扉の役目
をも果たすことになる。 The opening/closing heaters 50A and 50B are fixed heaters 40
The opening/closing heater 50A is a graphite rod heater made of graphite rod heaters 51A, 52.
A, 53A, opening/closing heater 50
Similarly, heater B is composed of heaters 51B, 52B, and 53B. In other words, open/close heaters 50A, 50B
, open the opening/closing doors 11A and 11B to remove the workpiece 30.
It also serves as a door when inserting into the furnace shell 10.
次に開閉ヒータ５０Ａについて第３図を参照し
て更に詳しく説明する。ヒータ５２Ａの接続金具
がヒータ５１Ａ，５３Ａの接続金具の一方にボル
ト・ナツト５６Ａ，５７Ａでもつて夫々連結さ
れ、更に固定ヒータ４０Ｄ，４０Ｃの接続金具が
ヒータ５１Ａ，５３Ａの接続金具の他方にボル
ト・ナツト５４Ａ，５５Ａでもつて夫々連結され
て、これで緩められたボルト・ナツト５４Ａ，５
５Ａを軸として開閉するような構成となつてい
る。また開閉ヒータ５０Ａにおける横方向の長
さ、重量等を考慮して、閉じられた状態でのその
安定性を高めるために、他のヒータの接続金具よ
りは遥かに長いヒータ５２Ａの接続金具の一方を
支持棒５２１Ａとして筒体状断熱壁２０の手前側
下面に設けてあるヒータ絶縁ガイシ６０Ａの上面
で受け止めるようにしてある。ところで開閉ヒー
タ５０Ａは、固定ヒータ４０Ｄ，４０Ｃに対して
直列に接続された形となつており、これで電源供
給が行われるようになつている。しかし電流経路
となるボルト・ナツト５４Ａ，５５Ａを手で締め
る程度でも、他のヒータからの輻射熱により接続
金具自体が膨張することにより、この部の接触不
良が生じるという虞れは生じない。一方の開閉ヒ
ータ５０Ｂの構成についても上記と全く同様であ
るので説明は省略する。 Next, the opening/closing heater 50A will be explained in more detail with reference to FIG. The connecting fitting of the heater 52A is connected to one of the connecting fittings of the heaters 51A, 53A with bolts and nuts 56A, 57A, respectively, and the connecting fitting of the fixed heaters 40D, 40C is connected with the other connecting fitting of the heaters 51A, 53A with a bolt/nut. The bolts and nuts 54A and 5 are connected with the nuts 54A and 55A, respectively, and are loosened with this.
It is configured to open and close around 5A. Also, in consideration of the lateral length, weight, etc. of the opening/closing heater 50A, one of the connecting fittings of the heater 52A is much longer than the connecting fittings of other heaters in order to increase its stability in the closed state. The supporting rod 521A is received by the upper surface of the heater insulating insulator 60A provided on the lower surface of the near side of the cylindrical heat insulating wall 20. By the way, the opening/closing heater 50A is connected in series to the fixed heaters 40D and 40C, so that power is supplied thereto. However, even if the bolts and nuts 54A and 55A, which form the current path, are tightened by hand, there is no risk that the connecting fittings themselves will expand due to radiant heat from other heaters, resulting in poor contact in these parts. The configuration of one opening/closing heater 50B is also exactly the same as described above, so a description thereof will be omitted.
従つて、本実施例による場合には、開閉扉１１
Ａ，１１Ｂ、開閉ヒータ５０Ａ，５０Ｂを開け
て、被処理物３０をセツトした後に、開閉ヒータ
５０Ａ，５０Ｂ、開閉扉１１Ａ，１１Ｂを順次的
に閉じ、その後炉殻１０の内部が所定の条件に達
したならば、固定ヒータ４０Ａ〜４０Ｆ、開閉ヒ
ータ５０Ａ，５０Ｂの給電を行うという順序で、
被処理物３０の焼き入れを行うのであるが、被処
理物３０の側周面は固定ヒータ４０Ａ〜４０Ｆか
らの輻射熱により、一方被処理物３０の両端面は
開閉ヒータ５０Ａ，５０Ｂからの輻射熱により
夫々対向加熱されるようになつているので、ここ
に被処理物３０の均等加熱が行われることにな
る。しかも従来設備を有効に利用することができ
ることから、被処理物３０の焼き入れの質向上と
ともに経済性のメリツトも十分で、それ故実用性
も十分ある。 Therefore, in the case of this embodiment, the opening/closing door 11
After opening the opening/closing heaters 50A, 11B and the opening/closing heaters 50A, 50B and setting the workpiece 30, the opening/closing heaters 50A, 50B and the opening/closing doors 11A, 11B are sequentially closed, and then the inside of the furnace shell 10 is brought under predetermined conditions. When the power is reached, power is supplied to the fixed heaters 40A to 40F and the opening/closing heaters 50A and 50B.
The workpiece 30 is hardened, and the side peripheral surface of the workpiece 30 is heated by radiant heat from the fixed heaters 40A to 40F, while both end faces of the workpiece 30 are hardened by the radiant heat from the opening/closing heaters 50A and 50B. Since they are heated facing each other, the object to be processed 30 is heated evenly. Moreover, since conventional equipment can be used effectively, the quality of hardening of the object 30 to be treated is improved and there are sufficient economic merits, and therefore, it is also sufficiently practical.
なお、本考案にかかる熱処理炉用加熱ヒータ
は、上記実施例に限定されず、例えば第４図に示
すように固定ヒータ４０Ａ，４０Ｂ，４０Ｅ，４
０Ｆ（４０Ａ，４０Ｆは図示せず）の途中を、或
いは開閉ヒータ５０Ａ，５０Ｂの途中を夫々折れ
曲げ可能なようにしても構わない。この場合には
いびつな形状の被処理物３０でも均等加熱が行わ
れることになる。また固定ヒータ、開閉ヒータに
あつては、フレキシブル性を元来有する一枚のク
ロスヒータで代用させるようにしても構わない。 Note that the heater for a heat treatment furnace according to the present invention is not limited to the above-mentioned embodiment, and may include fixed heaters 40A, 40B, 40E, 4 as shown in FIG.
0F (40A, 40F are not shown) or the opening/closing heaters 50A, 50B may be made bendable. In this case, uniform heating is performed even on the object 30 having an irregular shape. Furthermore, in the case of a fixed heater or an opening/closing heater, a single cross heater which inherently has flexibility may be used instead.
考案の効果
以上、本考案にかかる熱処理炉用加熱ヒータに
よる場合には、固定ヒータ及び開閉ヒータによつ
て被処理物を均等に加熱することができ、熱処理
の質向上を図ることができる。しかも開閉ヒータ
を固定ヒータの炉殻端面側の一端にヒンジで連結
するようにしていることから、開閉扉の裏側に別
途ヒータを取り付ける場合とは異なり、特別なヒ
ータ取付部材や電源引き込み用の電極等が要ら
ず、低コストを図る上でもメリツトがある。よつ
て、熱処理炉の大型化にも十分に対応することが
可能となる。Effects of the Invention As described above, in the case of the heater for a heat treatment furnace according to the present invention, the workpiece can be heated evenly by the fixed heater and the opening/closing heater, and the quality of heat treatment can be improved. Moreover, since the opening/closing heater is connected to one end of the fixed heater on the furnace shell end face side with a hinge, unlike the case where a separate heater is attached to the back side of the opening/closing door, special heater mounting parts and power supply electrodes are required. etc., which is advantageous in terms of reducing costs. Therefore, it becomes possible to sufficiently cope with an increase in the size of the heat treatment furnace.
第１図から第４図にかけては、本考案にかかる
熱処理炉用加熱ヒータにおける実施例の説明図で
あつて、第１図は焼き入れ炉の簡略断面図、第２
図は第１図のＡ−Ａ線による矢視図、第３図は固
定ヒータ及び開閉ヒータの斜視図、第４図は変形
例を説明するための焼き入れ炉の簡略断面図であ
る。第５図から第６図にかけては、従来の熱処理
炉用加熱ヒータの説明図であつて、第５図は焼き
入れ炉の簡略断面図、第６図は第５図のＢ−Ｂ線
による断面図である。
１０……炉殻、１１Ａ，１１Ｂ……開閉扉、３
０……被処理物、４０Ａ〜４０Ｈ……固定ヒー
タ、５０Ａ，５０Ｂ……開閉ヒータ。
1 to 4 are explanatory diagrams of an embodiment of a heater for a heat treatment furnace according to the present invention, in which FIG. 1 is a simplified sectional view of a quenching furnace, and FIG.
3 is a perspective view of a fixed heater and an opening/closing heater, and FIG. 4 is a simplified sectional view of a quenching furnace for explaining a modification. 5 to 6 are explanatory diagrams of a conventional heater for a heat treatment furnace, in which FIG. 5 is a simplified cross-sectional view of a quenching furnace, and FIG. 6 is a cross-sectional view taken along line B-B in FIG. It is a diagram. 10... Furnace shell, 11A, 11B... Opening/closing door, 3
0: Object to be processed, 40A to 40H: Fixed heater, 50A, 50B: Open/close heater.
Claims (1)
処理炉の炉殻内に装備される加熱ヒータであつ
て、炉殻の奥行方向に向けて配設された固定ヒー
タと、一端が固定ヒータの炉殻端面側の一端にヒ
ンジで連結されており炉殻の端面方向から炉殻の
奥行方向にかけて開閉自在に設けられた開閉ヒー
タとを具備することを特徴とする熱処理炉用加熱
ヒータ。 A heater installed in the furnace shell of a heat treatment furnace whose opening/closing door can be opened and closed on the end face of the furnace shell, and includes a fixed heater arranged toward the depth of the furnace shell and a fixed heater at one end. A heater for a heat treatment furnace, characterized in that the heater is connected to one end of the furnace shell by a hinge and is provided to be openable and closable from the end surface direction of the furnace shell to the depth direction of the furnace shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988005238U JPH0527825Y2 (en) | 1988-01-18 | 1988-01-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988005238U JPH0527825Y2 (en) | 1988-01-18 | 1988-01-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01109194U JPH01109194U (en) | 1989-07-24 |
| JPH0527825Y2 true JPH0527825Y2 (en) | 1993-07-15 |
Family
ID=31208445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988005238U Expired - Lifetime JPH0527825Y2 (en) | 1988-01-18 | 1988-01-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0527825Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5808730B2 (en) * | 2012-12-20 | 2015-11-10 | イプセン，インコーポレイテッド | Heating element array structure for vacuum heat treatment furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6333595B2 (en) * | 1980-08-11 | 1988-07-06 | Sharp Kk |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6333595U (en) * | 1986-08-21 | 1988-03-04 |
-
1988
- 1988-01-18 JP JP1988005238U patent/JPH0527825Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6333595B2 (en) * | 1980-08-11 | 1988-07-06 | Sharp Kk |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01109194U (en) | 1989-07-24 |
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