JPH0222587Y2 - - Google Patents
Info
- Publication number
- JPH0222587Y2 JPH0222587Y2 JP1983125005U JP12500583U JPH0222587Y2 JP H0222587 Y2 JPH0222587 Y2 JP H0222587Y2 JP 1983125005 U JP1983125005 U JP 1983125005U JP 12500583 U JP12500583 U JP 12500583U JP H0222587 Y2 JPH0222587 Y2 JP H0222587Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- circuit
- compressor
- switch
- outdoor fan
- 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
- 239000003507 refrigerant Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009499 grossing 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、空冷式空気調和機に係り、詳しく
は、空気調和機の始動を円滑にするべく改良した
空冷式空気調和機に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an air-cooled air conditioner, and more specifically, to an air-cooled air conditioner that has been improved to facilitate smooth startup of the air conditioner. .
（従来の技術）
この種空気調和機は、電子計算機や電子計算機
室などにおいては冬期など外気温が低温時であつ
ても冷房を必要とし、これら用途に広く用いられ
るものである。(Prior Art) This type of air conditioner is widely used in electronic computers, computer rooms, etc., which require cooling even when the outside temperature is low, such as in winter.
ところが、従来この種空気調和機は、例えば実
開昭56−107476号公報に示される如きものであつ
て、これを添付第２図及び第３図に基づいて説明
すると、第２図は、圧縮機と室外フアンの同時始
動方式であつて、図において運転スイツチ１１を
投入すると、室内サーモ１２がオン時、圧縮機
CMと室外フアンFM2とは同時に通電され同時始
動するものであり、第３図は、外気温が高いとき
などに用いられるもので、室外フアンFM2が先
に始動し、圧縮機CMが遅れて始動する方式で、
図において、運転スイツチ１１を投入すると、室
内サーモ１２がオン時は室外フアンFM2が先ず
始動し、高圧冷媒圧力と低圧冷媒圧力との圧力差
が設定圧力差よりも大のときオフし、設定圧力差
よりも小のとき（所謂高低圧バランス時）オンす
る圧力差検知スイツチ１０のオン・オフ状態で圧
縮機CMの始動が左右されるもので、今、室内サ
ーモ１２の作動で圧縮機CMが停止し、室温が上
がつて再度室内サーモ１２がオンした時、先ず室
外フアンFM2が始動し、高低圧バランス後に暫
時遅れて圧縮機CMが始動するのである。 However, conventional air conditioners of this type are as shown in Japanese Utility Model Application Publication No. 56-107476, and this will be explained based on the attached FIGS. 2 and 3. FIG. The system starts the compressor and the outdoor fan at the same time, and when the operation switch 11 is turned on as shown in the figure, when the indoor thermostat 12 is turned on, the compressor starts.
The CM and the outdoor fan FM 2 are energized and started at the same time. Figure 3 shows the one used when the outside temperature is high, with the outdoor fan FM 2 starting first and the compressor CM being delayed. The method starts with
In the figure, when the operation switch 11 is turned on, the outdoor fan FM 2 starts first when the indoor thermostat 12 is on, and turns off when the pressure difference between the high-pressure refrigerant pressure and the low-pressure refrigerant pressure is larger than the set pressure difference, and then The start of the compressor CM is determined by the on/off state of the pressure difference detection switch 10, which is turned on when the pressure difference is smaller than the pressure difference (so-called high-low pressure balance). stops, and when the room temperature rises and the indoor thermostat 12 is turned on again, the outdoor fan FM 2 is started first, and after a certain delay, the compressor CM is started after the high and low pressures are balanced.
（考案が解決しようとする課題）
しかしながらこれら方式においては、今外気温
が例えば５〜10℃と低いときに用いると、前記何
れの方式も室内サーモがオンと同時に室外フアン
が始動する方式であるので、室外フアンの回転に
より室外熱交換器（凝縮器）が冷却され、高圧部
の冷媒圧力はなかなか上がらない。高圧が上昇し
ないので低圧部蒸発器の冷媒圧力は異常に低下す
ることとなり、蒸発器に霜がつき、冷却能力が
発揮できない。低圧の低下により冷媒の比体積
が大となり、冷媒循環量が小となり、圧縮機モー
タの冷却不足のため圧縮機保護サーモの作用で圧
縮機は停止する。(Problem to be solved by the invention) However, in these methods, if used when the outside temperature is as low as 5 to 10 degrees Celsius, the outdoor fan starts at the same time as the indoor thermostat is turned on. Therefore, the outdoor heat exchanger (condenser) is cooled by the rotation of the outdoor fan, and the refrigerant pressure in the high pressure section does not rise easily. Since the high pressure does not rise, the refrigerant pressure in the low-pressure evaporator will drop abnormally, causing frost to form on the evaporator and preventing it from achieving its cooling capacity. Due to the drop in low pressure, the specific volume of the refrigerant increases, the amount of refrigerant circulation decreases, and the compressor motor stops cooling due to the action of the compressor protection thermostat.
以上のように、前記従来方式では、外気温が低
温時においては空気調和機の冷房運転は不能とな
るという欠陥があるが、これは前記何れの方式も
室内サーモのオンと同時に室外フアンが始動する
ためである。 As mentioned above, the above-mentioned conventional methods have a defect in that the air conditioner cannot perform cooling operation when the outside temperature is low, but this is because the outdoor fan starts at the same time as the indoor thermostat is turned on in both of the above-mentioned methods. This is to do so.
本考案は、上記の如き従来欠陥に鑑み空冷式空
気調和機の始動を円滑にすべく、特に外気温が低
温時に高圧部の冷媒圧力の立上がりを容易、確実
にして、前記従来例の如き霜付きや圧縮機保護サ
ーモの作用による圧縮機停止などの問題を解消す
ることを目的とするものである。 In view of the above-mentioned conventional deficiencies, the present invention aims to make the startup of an air-cooled air conditioner smoother by making it easier and more reliable to build up the refrigerant pressure in the high-pressure section, especially when the outside temperature is low. The purpose of this is to solve problems such as compressor stoppage due to the action of compressor protection thermostats and compressor protection thermostats.
（課題を解決するための手段）
このため本考案の構成は、室内サーモ１を備え
て室温が設定値以上のとき運転信号、設定値より
も低いとき停止信号を夫々出力する室内サーモ回
路Ｃに、冷媒回路の高圧部の冷媒圧力が所定値以
上のとき運転信号、所定値よりも低いとき停止信
号を夫々出力する圧力開閉器６３CHと、室外フ
アンを運転・停止させる室外フアン用開閉器５２
Ｆとの直列回路を接続し、該直列回路に並列に圧
縮機用開閉器５２Ｃの回路とタイマーＴ回路を設
け、該タイマーＴの限時接点T1を前記圧縮機用
開閉器５２Ｃの回路に介設した空冷式空気調和機
の構成を特徴とする。(Means for Solving the Problems) Therefore, the configuration of the present invention is such that an indoor thermo circuit C is equipped with an indoor thermostat 1 and outputs an operating signal when the room temperature is above a set value and a stop signal when the room temperature is lower than the set value. , a pressure switch 63CH that outputs an operation signal when the refrigerant pressure in the high-pressure part of the refrigerant circuit is above a predetermined value and a stop signal when it is lower than a predetermined value, and an outdoor fan switch 52 that operates and stops the outdoor fan.
A series circuit with F is connected, a compressor switch 52C circuit and a timer T circuit are provided in parallel with the series circuit, and a time limit contact T1 of the timer T is connected to the compressor switch 52C circuit. It is characterized by the configuration of an air-cooled air conditioner.
（作用）
上記の構成により、外気低温時は圧縮機が先に
始動し、その後に室外フアンが始動する。一方外
気高温時は室外フアンが先に始動し、その後、圧
縮機が始動することになる。そしてこれによつて
外気温度の高低にかかわらず、円滑な冷房運転を
することができる。(Function) With the above configuration, when the outside temperature is low, the compressor starts first, and then the outdoor fan starts. On the other hand, when the outside temperature is high, the outdoor fan starts first, and then the compressor starts. This allows smooth cooling operation regardless of the outside temperature.
（実施例）
以下本考案の実施例について添付図面に基づい
て説明する。(Example) Examples of the present invention will be described below based on the accompanying drawings.
第１図は本考案実施の空気調和機の電気回路図
である。 FIG. 1 is an electrical circuit diagram of an air conditioner embodying the present invention.
第１図において、１は室温が設定値以上の高温
ときオンし、、設定値よりも低いときオフする室
内サーモ、Ｘは前記室内サーモ１の回路に直列に
設けたリレー、X1は前記リレーＸの励磁時オン
して閉成するリレーＸの接点、６３CHは冷媒回
路の高圧部（凝縮器）の冷媒圧力が所定値以上の
ときオンして運転信号を出力し、所定値よりも低
いときオフして停止信号を出力する圧力開閉器、
２は外気温が設定値以上のときオンして運転信号
を出力し、設定値よりも低いときオフして停止信
号を出力する外気サーモ、５２F1，５２F2はそ
れぞれ投入、開放によつて各室外フアンを運転・
停止させる第１，第２の室外フアン用開閉器で、
前記室内サーモ１、リレーＸ、リレーＸの接点
X1よりなる室内サーモ回路Ｃに対して、圧力開
閉器６３CHと両室外フアン用開閉器５２F1，５
２F2を直列に設けてなる室外フアン回路Ｂが接
続されている。該室外フアン回路Ｂは、両室外フ
アン用開閉器５２F1，５２F2の前位に前記圧力
開閉器６３CHが介設され、第２室外フアン用開
閉器５２F2は外気サーモ２を開始、第１室外フ
アン用開閉器５２F1に対し並列に設けられてい
る。なお、前記例では室内サーモ回路Ｃにリレー
Ｘ、その接点X1を設けたが、リレーＸ、その接
点X1がなくても良い。 In Fig. 1, 1 is an indoor thermostat that turns on when the room temperature is higher than a set value and turns off when it is lower than a set value, X is a relay installed in series with the circuit of the indoor thermostat 1, and X1 is the relay. The contact of relay Pressure switch that turns off and outputs a stop signal,
2 is an outside air thermostat that turns on when the outside temperature is above the set value and outputs an operation signal, and turns off when it is lower than the set value and outputs a stop signal . Operating an outdoor fan
With the first and second outdoor fan switches to be stopped,
Contact points of the indoor thermostat 1, relay X, and relay X
For indoor thermo circuit C consisting of X 1 , pressure switch 63CH and both outdoor fan switches 52F 1 , 5
An outdoor fan circuit B consisting of 2F2 connected in series is connected. In the outdoor fan circuit B, the pressure switch 63CH is interposed in front of both the outdoor fan switches 52F 1 and 52F 2 , and the second outdoor fan switch 52F 2 starts the outside air thermostat 2, and the first It is provided in parallel to the outdoor fan switch 52F1 . In the above example, the indoor thermocircuit C is provided with the relay X and its contact X1 , but the relay X and its contact X1 may not be provided.
一方、Ｔはタイマー、T1はこのタイマーＴの
限時接点、５２Ｃは投入、開放によつて圧縮機を
運転・停止させる圧縮機用開閉器で、該圧縮機用
開閉器５２Ｃの回路とタイマーＴ回路とが並列に
設けられ、限時接点T1が圧縮機用開閉器５２Ｃ
の前位に介設されて圧縮機回路Ａが形成されてい
る。 On the other hand, T is a timer, T1 is a time limit contact of this timer T, and 52C is a compressor switch that operates and stops the compressor by closing and opening, and the circuit of the compressor switch 52C and the timer T The circuit is installed in parallel, and the time-limiting contact T1 is connected to the compressor switch 52C.
A compressor circuit A is formed in front of the compressor circuit A.
そして該圧縮機回路Ａは前記室外フアン回路Ｂ
に対して並列に設けられている。 The compressor circuit A is the outdoor fan circuit B.
are installed in parallel to the
以上空気回路において、今空調機の室温が上が
り室内サーモがオンすると、リレーＸが励磁、リ
レーＸの接点X1がオンし、タイマーＴに通電さ
れ、例えば３分間経過後（高低圧差バランス後）
限時接点T1がオンし、圧縮機用開閉器５２Ｃに
通電され圧縮機が始動する。このとき外気温が所
定値より低いと、高圧部の冷媒圧力は低いので圧
力開閉器６３CHはオフしたままで、室外フアン
用開閉器５２F1，５２F2は通電されず室外フア
ンは何れも始動しない。暫時圧縮機の運転を続け
ると、高圧部の冷媒圧力が上がり所定値に達する
と、圧力開閉器６３CHがオンし、第１の室外フ
アン用開閉器５２F1に通電され、第１室外フア
ンが運転を始める。なお、第２の室外フアン用開
閉器５２F2は外気温が上がり外気サーモ２がオ
ン時に通電され、第２室外フアンを始動するもの
である。 In the above air circuit, when the room temperature of the air conditioner rises and the indoor thermostat is turned on, relay X is energized, contact X 1 of relay
The time limit contact T1 is turned on, the compressor switch 52C is energized, and the compressor is started. At this time, if the outside temperature is lower than the predetermined value, the refrigerant pressure in the high pressure section is low, so the pressure switch 63CH remains off, the outdoor fan switches 52F 1 and 52F 2 are not energized, and neither of the outdoor fans starts. . When the compressor continues to operate for a while, the refrigerant pressure in the high pressure section rises and reaches a predetermined value, the pressure switch 63CH turns on, the first outdoor fan switch 52F1 is energized, and the first outdoor fan starts operating. Start. The second outdoor fan switch 52F2 is energized when the outside temperature rises and the outside air thermostat 2 is turned on, and starts the second outdoor fan.
一方、外気温が高い場合は、高圧部の冷媒圧力
が高いので圧力開閉器６３CHがまずオンし、第
１の室外フアン用開閉器５２F1に通電され、外
気サーモ２を介して第２の室外フアン用開閉器５
２F2に通電される。その後、前述のようにタイ
マーＴの限時接点T1がオンし、圧縮機が始動す
る。 On the other hand, when the outside temperature is high, the refrigerant pressure in the high-pressure part is high, so the pressure switch 63CH is turned on first, the first outdoor fan switch 52F1 is energized, and the second outdoor fan is connected via the outside air thermostat 2. Fan switch 5
2F 2 is energized. Thereafter, the time limit contact T1 of the timer T is turned on as described above, and the compressor is started.
以上本考案例によると、外気温が低温時には先
ず圧縮機が始動し、高圧部の冷媒圧力が所定値以
上になると圧力開閉器６３CHがオンし室外フア
ンが始動するのであるが、圧力開閉器６３CHの
セツト値（所定値）は、本考案の実験によると５
〜６Kg／cm2（ゲージ圧）が良く（このとき冷媒温
度は飽和圧力で５〜10℃である。）このセツト値
で外気温が５〜10℃以下と低温であつても先に圧
力機が始動し、空気調和機がシステムとしての立
ち上がりが容易であり、これにより外気温が−５
〜43℃まで冷房運転が可能であることが分かつ
た。 As described above, according to the present invention, when the outside temperature is low, the compressor is started first, and when the refrigerant pressure in the high pressure section exceeds a predetermined value, the pressure switch 63CH is turned on and the outdoor fan is started. According to the experiment of this invention, the set value (predetermined value) is 5.
~6Kg/cm 2 (gauge pressure) is good (at this time, the refrigerant temperature is 5 to 10℃ at saturation pressure.) With this set value, even if the outside temperature is as low as 5 to 10℃, the pressure starts, the air conditioner easily starts up as a system, and this allows the outside temperature to drop to -5.
It was found that cooling operation is possible up to 43℃.
一方、外気温が高温時にはまず圧力開閉器６３
CHのオンにより室外フアンが始動し、その後タ
イマーＴの限時接点T1がオンして圧縮機が始動
するので、凝縮器内の圧力をあらかじめ下げるこ
とができ、圧縮機始動の始動電流を低減し、円滑
に始動することができる。 On the other hand, when the outside temperature is high, the pressure switch 63
When CH turns on, the outdoor fan starts, and then the time limit contact T1 of timer T turns on and the compressor starts, so the pressure inside the condenser can be lowered in advance, reducing the starting current for starting the compressor. , can start smoothly.
（考案の効果）
叙上詳述した如く、本考案は、空冷式空気調和
機において、室内サーモ１を備えて室温が設定値
以上のとき運転信号、設定値よりも低いとき停止
信号を夫々出力する室内サーモ回路Ｃに、冷媒回
路の高圧部の冷媒圧力が所定値以上のとき運転信
号、所定値よりも低いとき停止信号を夫々出力す
る圧力開閉器６３CHと、室外フアンを運転・停
止させる室外フアン用開閉器５２Ｆとの直列回路
を接続し、該直列回路に並列に圧縮機用開閉器５
２Ｃの回路とタイマーＴ回路を設け、該タイマー
Ｔの限時接点T1を前記圧縮機用開閉器５２Ｃの
回路に介設したことを特徴とする空冷式空気調和
機としたことにより、外気温が低温時には先ず圧
縮機が始動し、高圧部の冷媒圧力が所定値以上に
なつて前記圧力開閉器６３CHがオンして室外フ
アンが始動し、それまでは停止したままであるの
で、外気温が低温時にあつても、高圧部の冷媒圧
力は速やかに上昇するので、低圧部（蒸発部）の
低圧冷媒圧力も異常に低下することがないので、
前記従来例の如き蒸発器への霜付きや圧縮機保護
サーモが作用して圧縮機を停止させことなどは完
全に解消され、システムとして円滑な冷房運転が
可能となつたものである。(Effects of the invention) As detailed above, the present invention provides an air-cooled air conditioner that is equipped with an indoor thermostat 1 and outputs an operation signal when the room temperature is above a set value, and a stop signal when it is lower than the set value. A pressure switch 63CH that outputs an operation signal when the refrigerant pressure in the high-pressure part of the refrigerant circuit is above a predetermined value and a stop signal when it is lower than the predetermined value is connected to the indoor thermocircuit C that operates the outdoor fan. A series circuit with the fan switch 52F is connected, and a compressor switch 5 is connected in parallel to the series circuit.
2C circuit and a timer T circuit, and the time limit contact T1 of the timer T is interposed in the circuit of the compressor switch 52C, so that the outside temperature can be reduced. When the temperature is low, the compressor starts first, and when the refrigerant pressure in the high pressure section exceeds a predetermined value, the pressure switch 63CH turns on and the outdoor fan starts. Even if the refrigerant pressure in the high pressure section rises quickly, the low pressure refrigerant pressure in the low pressure section (evaporation section) will not drop abnormally.
The problems of frost on the evaporator and stoppage of the compressor due to the action of the compressor protection thermostat, as in the conventional example, are completely eliminated, and the system can now operate smoothly as a cooling system.
また外気温が高温時は圧縮機が始動する前に室
外フアンが始動するので、凝縮器内の圧力をあら
かじめ下げることができ、圧縮機始動時の始動電
流の低減を図り、前記同様システムの円滑な冷房
運転が可能となる。 In addition, when the outside temperature is high, the outdoor fan starts before the compressor starts, so the pressure inside the condenser can be lowered in advance, reducing the starting current when starting the compressor, and smoothing out the system as described above. Cooling operation becomes possible.
また、アンロード始動を行う圧縮機（高圧をか
けてロード状態、低圧のときアンロード）におい
ても、外気温が低温時は、高圧の立ち上がりが遅
れるので、電気的にはロード状態になつても実際
には、高圧が上がらないので高低圧差がつかず、
ロード状態に切換わらないなどの問題があるが、
前記本考案を採用することにより立ち上がりが早
くなるという効果もある。 In addition, even in compressors that start unloaded (loaded with high pressure and unloaded with low pressure), when the outside temperature is low, the rise of high pressure is delayed, so electrically even if the compressor is in the loaded state. In reality, since high pressure does not rise, there is no difference between high and low pressure,
There are problems such as not switching to loading state, but
By adopting the present invention, there is also the effect that the start-up becomes faster.
第１図は本考案を実施した空冷式空気調和機の
電気回路図の一例、第２図は従来の空冷式空気調
和機の電気回路図の一例、第３図は同他の例。
５２Ｃ……圧縮機用開閉器、５２F1，５２F2
……室外フアン用開閉器、Ａ……圧縮機回路、Ｂ
……室外フアン回路、６３CH……圧力開閉器、
１……室内サーモ、Ｃ……室内サーモ回路、Ｔ…
…タイマー、T1……限時接点。
FIG. 1 is an example of an electric circuit diagram of an air-cooled air conditioner embodying the present invention, FIG. 2 is an example of an electric circuit diagram of a conventional air-cooled air conditioner, and FIG. 3 is another example of the same. 52C...Compressor switch, 52F 1 , 52F 2
...Outdoor fan switch, A...Compressor circuit, B
...Outdoor fan circuit, 63CH...Pressure switch,
1... Indoor thermostat, C... Indoor thermostat circuit, T...
...Timer, T 1 ...Time-limited contact.
Claims (1)
運転信号、設定値よりも低いとき停止信号を夫々
出力する室内サーモ回路Ｃに、冷媒回路の高圧部
の冷媒圧力が所定値以上のとき運転信号、所定値
よりも低いとき停止信号を夫々出力する圧力開閉
器６３CHと、室外フアンを運転・停止させる室
外フアン用開閉器５２Ｆとの直列回路を接続し、
該直列回路に並列に圧縮機用開閉器５２Ｃの回路
とタイマーＴ回路を設け、該タイマーＴの限時接
点T1を前記圧縮機用開閉器５２Ｃの回路に介設
したことを特徴とする空冷式空気調和機。 The indoor thermo circuit C, which is equipped with an indoor thermostat 1 and outputs an operation signal when the room temperature is above a set value and a stop signal when it is lower than the set value, outputs an operation signal when the refrigerant pressure in the high pressure section of the refrigerant circuit is above a predetermined value. , connect a series circuit of the pressure switch 63CH that outputs a stop signal when the pressure is lower than a predetermined value, and the outdoor fan switch 52F that starts and stops the outdoor fan,
An air-cooled type characterized in that a circuit for a compressor switch 52C and a timer T circuit are provided in parallel with the series circuit, and a time limit contact T1 of the timer T is interposed in the circuit for the compressor switch 52C. Air conditioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12500583U JPS6039843U (en) | 1983-08-10 | 1983-08-10 | Air-cooled air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12500583U JPS6039843U (en) | 1983-08-10 | 1983-08-10 | Air-cooled air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6039843U JPS6039843U (en) | 1985-03-20 |
| JPH0222587Y2 true JPH0222587Y2 (en) | 1990-06-19 |
Family
ID=30284769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12500583U Granted JPS6039843U (en) | 1983-08-10 | 1983-08-10 | Air-cooled air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6039843U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50117049A (en) * | 1974-02-27 | 1975-09-12 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5117858U (en) * | 1974-07-29 | 1976-02-09 | ||
| JPS5913548Y2 (en) * | 1977-04-22 | 1984-04-21 | 松下電器産業株式会社 | Air conditioner operation control device |
| JPS55162074U (en) * | 1979-05-09 | 1980-11-20 |
-
1983
- 1983-08-10 JP JP12500583U patent/JPS6039843U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50117049A (en) * | 1974-02-27 | 1975-09-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6039843U (en) | 1985-03-20 |
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