JPS6314012A - Hot-water supplier - Google Patents
Hot-water supplierInfo
- Publication number
- JPS6314012A JPS6314012A JP61152466A JP15246686A JPS6314012A JP S6314012 A JPS6314012 A JP S6314012A JP 61152466 A JP61152466 A JP 61152466A JP 15246686 A JP15246686 A JP 15246686A JP S6314012 A JPS6314012 A JP S6314012A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- valve
- burner block
- gas burner
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims description 17
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/082—Regulating fuel supply conjointly with another medium, e.g. boiler water using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/18—Measuring temperature feedwater temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/16—Fuel valves variable flow or proportional valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/02—Controlling two or more burners
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は浴槽、あるいは台所などに給湯するガス瞬間式
等の給湯器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas instantaneous water heater for supplying hot water to bathtubs, kitchens, and the like.
従来の技術
一般にガス瞬間式給湯器は、第３図に示すような構成で
ある。すなわち、出湯温度の設定部１と熱交換器２と、
熱交換器２へ流れる入水温度を検知する入水温度検知セ
ンサ３と、熱交換器２へ流れる水′ｊｋを検知する水量
センサ４と、熱交換器２を加熱する２本のバーナを有す
る第１ガスバーナブロック５ａと、２本のガスバーナを
有する第２ガスバーナブロック５ｂと、この第２ガスバ
ーナブロック５ｂのガスを止めたり流したりするガス電
磁弁６と、前記両ガスバーナブロック５ａ、 ５ｂへの
ガス量を制御するガス圧力比例制御弁７を備えている。2. Description of the Related Art In general, a gas instantaneous water heater has a configuration as shown in FIG. That is, a hot water temperature setting section 1 and a heat exchanger 2,
A first sensor having an inlet water temperature detection sensor 3 that detects the temperature of water flowing into the heat exchanger 2, a water amount sensor 4 that detects the water 'jk flowing into the heat exchanger 2, and two burners that heat the heat exchanger 2. A gas burner block 5a, a second gas burner block 5b having two gas burners, a gas electromagnetic valve 6 for stopping or flowing gas in the second gas burner block 5b, and controlling the amount of gas to both gas burner blocks 5a and 5b. A gas pressure proportional control valve 7 is provided to control the gas pressure.
そして、さらに出湯温度を検知する出湯温度センサ８と
、燃焼するガス量に応じて供給する空気量を制御する空
気量制御ファン９と、空気量制御ファン９の回転を検出
する回転センサ１ｏと、バーナブロック５ａの点火器１
１と、これらを制御する制御装置１２とからなっている
。Furthermore, a hot water outlet temperature sensor 8 that detects the hot water outlet temperature, an air amount control fan 9 that controls the amount of air to be supplied according to the amount of gas to be combusted, and a rotation sensor 1o that detects the rotation of the air amount control fan 9. Igniter 1 of burner block 5a
1, and a control device 12 that controls them.
発明が解決しようとする問題点
ところが、このような構成で第４図のようなガス量とガ
ス圧力比例制御弁７の開度との関係で制御すると、すな
わち、ガス電磁弁６が閉の状態で第１ガスバーナブロッ
ク５ａのみ燃焼しているとき、Ａのガス量制御域、ガス
電磁弁６が開の状態で両ガスバーナブロック５ａ、５ｂ
が燃焼しているときのガス量制御域がＢ、Ｃはそれぞれ
の制御域Ａ１Ｂがオーバーラツプしている域で、ガス量
制御域Ａからガス量制御域Ｂに変わるのは、Ｐ点又ガス
量制御域Ｂからガス量制御域Ａに変るのば０点である。Problems to be Solved by the Invention However, if such a configuration is controlled based on the relationship between the gas amount and the opening degree of the gas pressure proportional control valve 7 as shown in FIG. When only the first gas burner block 5a is burning, in the gas amount control region A, both gas burner blocks 5a and 5b are in the open state with the gas solenoid valve 6 open.
The gas flow control ranges B and C when the gas is burning are regions where the respective control ranges A and B overlap, and the change from gas flow control range A to gas flow control range B occurs at point P or gas flow. A change from control area B to gas amount control area A is 0 point.
そしてＰ点からガス量制御域Ｂに移るときに、同一ガス
量Ｑになるようにガス量を制御すると、ガス量制御域Ａ
では２本のガスバーナを有する第１ガスバーナブロック
５ａでＱのガス量あったとする（１本当りはＱ／２のガ
ス量）。そこで、Ｐ点でガス量制御域Ｂになり、それぞ
れ２本のバーナを有スる第１と第２ガスバーナブロック
５ａ。Then, when moving from point P to gas amount control area B, if the gas amount is controlled so that the gas amount is the same Q, then gas amount control area A
Now, assume that the first gas burner block 5a having two gas burners has a gas amount of Q (one burner has a gas amount of Q/2). Therefore, the gas amount control region B is reached at point P, and the first and second gas burner blocks 5a each have two burners.
５ｂ合計４木のバーナでＱを燃焼させると１本光たりは
１／４Ｑとなり、ガス圧を小さくしないと１／４Ｑにな
らない。そして一般にガス圧が低くなると、となりのバ
ーナに火移しにくくなる為、一方のガスバーナブロック
５ａである２本のバーナから他のガスバーナブロック５
ｂである２本のバーナへ火が移らないで未燃ガスが多量
に出たり燃焼室内に未燃ガス充満してから火が移るなど
して、火移りが遅れて大きな音が出たりする等の問題点
があった。5b If you burn Q with a total of 4 wood burners, each light will be 1/4Q, and it will not be 1/4Q unless you reduce the gas pressure. In general, when the gas pressure becomes low, it becomes difficult for the flame to transfer to the adjacent burner.
(b) The flame does not transfer to the two burners and a large amount of unburned gas comes out, or the combustion chamber is filled with unburned gas and then the flame transfers, resulting in delayed flame transfer and loud noises. There was a problem.
本発明は、前記のような従来の問題点分解消するもので
あり、一方のガスバーナブロックかう他方のガスバーナ
ブロックに火移りさせるとき、火移りが遅れ未燃ガスが
出たり、大きな火移り音がしたりしないようにしたガス
瞬間式給湯器を提供するものである。The present invention solves the above-mentioned conventional problems, and when the flame transfers from one gas burner block to the other, the flame transfer is delayed, unburned gas is emitted, and a loud flame transfer noise is generated. To provide a gas instantaneous water heater that does not cause
問題点を解決するための手段
上記問題点を解決するために、本発明のがヌ瞬間式給湯
器は、ガス圧力比例制御弁の開度の急変を検出しない弁
開度検出回路と、この弁開度検出回路が動作した後、第
１ガスバーナブロックと同時に第２ガスバーナブロック
を燃焼させるように燃料を送るガス電磁弁と、このガス
電磁弁が開いた後、前記弁開度検出回路が動作した状態
の開度でガス圧力比例制御弁を所定時間保つ保持回路を
設ケ、第１ガスバーナブロックから第２ガスバーナブロ
ックのバーナに火移りさせるものである。Means for Solving the Problems In order to solve the above problems, the instant water heater of the present invention includes a valve opening detection circuit that does not detect sudden changes in the opening of the gas pressure proportional control valve, and a valve opening detection circuit that does not detect sudden changes in the opening of the gas pressure proportional control valve. After the opening detection circuit was activated, a gas solenoid valve that sent fuel so as to burn the second gas burner block at the same time as the first gas burner block, and after this gas solenoid valve was opened, the valve opening detection circuit was activated. A holding circuit is installed to maintain the gas pressure proportional control valve at the opening degree for a predetermined period of time, and the flame is transferred from the first gas burner block to the burner of the second gas burner block.
作 用
上記構成により第１ガスバーナブロックだケチ燃焼して
いるときに、開度検出回路で設定した開度以上が数秒間
続いた後、第２ガヌパーナブロツクへガスを供給するガ
ス電磁弁をガス弁回路によって開く。このとき第１ガス
バーナブロックで燃焼していたガス量を第１ガスバーナ
ブロックと、第２ガスバーナブロックとに分けるのでな
く開度積出した状態の開度で（ガス量としては約２倍に
なる）所定時間保持回路で保持する。これにより第１ガ
スバーナブロックから第２ガヌパーナブロツクにヌムー
ズに火移抄する。Operation With the above configuration, when the first gas burner block is burning stingily, after the opening degree continues for several seconds at or above the opening degree set by the opening degree detection circuit, the gas solenoid valve that supplies gas to the second gas burner block is activated. Opened by gas valve circuit. At this time, the amount of gas being burned in the first gas burner block is not divided into the first gas burner block and the second gas burner block, but the opening degree is set to a predetermined value (the amount of gas is approximately twice as much). It is held by a time holding circuit. As a result, the flame is smoothly transferred from the first gas burner block to the second gas burner block.
実施例
以下本発明の一実施例のガス瞬間式給湯器の図面を参照
して説明する。第１図は本発明の一実施例を示す構成図
で、出湯温度設定部１〜点火器１１は前記従来技術の第
２図と同じであるので同一符号を付してその説明を省略
するとともに異なる部分を中心に説明する。第１ガヌパ
ーナブロツク５ａと第２がスバーナブロック５ｂが同時
に燃焼している時にガス圧力比例制御弁７はその燃料供
給路である弁を最少開度になっていることを検知する最
少弁開度検出回路１ａ、この最少弁開度検出回路１３が
最少弁開度を数秒間連続していることを検知するタイマ
回路１４と、がヌ電磁弁６が閉の時にガス圧力比例制御
弁７の開度が約６０％程度以とである状態が数秒間続い
たことを検出する弁開度検出回路１５と、との弁開度検
出回路１５が動作した後、前記ガス電磁弁６を開くガス
弁回路１６と、弁開度検出回路１５が動作した時のガス
圧力比例制御弁７の状態（約６０％程度Ｂ。Embodiment A gas instantaneous water heater according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. Since the hot water temperature setting unit 1 to the igniter 11 are the same as those in FIG. The explanation will focus on the different parts. When the first ganupana block 5a and the second svarna block 5b are burning at the same time, the gas pressure proportional control valve 7 is a minimum valve that detects that the valve, which is the fuel supply path, is at the minimum opening degree. An opening detection circuit 1a, a timer circuit 14 that detects that the minimum valve opening detection circuit 13 continues to maintain the minimum valve opening for several seconds, and a gas pressure proportional control valve 7 when the solenoid valve 6 is closed. The gas electromagnetic valve 6 is opened after the valve opening detection circuit 15 detects that the opening of the valve remains at about 60% or more for several seconds. The state of the gas pressure proportional control valve 7 when the gas valve circuit 16 and the valve opening detection circuit 15 operate (approximately 60% B).
との開度）で約１秒間その開度な保つ保持回路１７と、
これらを制御する制御装置１８とからなる。a holding circuit 17 that maintains the opening position for about 1 second at the opening degree);
It consists of a control device 18 that controls these.
次にその動作を説明する。蛇口１９を開くと水が流れ水
量センサ４が水の流れを検知する。するとこの信号をう
けて制御装置１８が働らいて点火器１１を動作させる。Next, its operation will be explained. When the faucet 19 is opened, water flows and the water flow sensor 4 detects the flow of water. Then, in response to this signal, the control device 18 is activated to operate the igniter 11.
一方、点火器１０が動作中に制御装置１８によりガス圧
力比例制御弁７が開き、これを検出した弁開度検出回路
１５の信号でガス弁回路１６が動作してガス電磁弁６が
開き、第１ガスバーナブロック５ａと、第２ガスバーナ
ブロック５ｂにガスが流れ、点火器１１により第１ガス
バーナブロック５ａが着火し、これよりの炎で第２がス
バーナブロック５ｂに火がつく。すると熱交換器２の中
を通る水が加熱され加熱された湯が出湯温度センサ８に
よって検出され、出湯温度設定部１で設定された温度に
なるようにガス圧力比例制御弁７でガス量が制御される
。そこで蛇口９で水をしぼると水が少なくなる為設定温
度に保とうとしてガス圧力比例制御弁７の開度が少なく
なる。ここでガス量とガス圧力比例制御弁７の開度を第
２図のように示す。上記のように第１ガスバーナブロッ
ク５ａと第２ガヌバーナプロノク５ｂとが同時に燃焼し
ているときはガス量制御域Ｂでガス量が制御される。そ
こで上記のように開度が少なくなると０点に達する。こ
の点に達すると最少弁開度検出回路１３が動作し、この
状態が数秒間続くとタイマ回路１４が動作し、ガフ弁回
路１６が動作しガス電磁弁６が閉になりガス１と開度は
Ｐ点になるように制御する。そして第１ガスバーナブロ
ック５ａだけが開のときはガス量制御域Ａでガス量が制
御される。次に再び蛇口９が少し開けられ水量が増加す
るとガス量も多くなる。するとガス量制御域ＡでＰ点よ
ゆ多くのガス量が出るＱ点にくる。すると、ガス圧力比
例制御弁７の６０％程度の弁の開度を弁開度検出回路１
５が検出して動作し、そしてガス弁回路１６が動作し、
ガス電磁弁６を開き、第２がスバーナブロック５ｂにガ
スを供給する。このとき弁開度検出回路１５が動作した
ときと同じ開度（約６０９６程度以上）でガス圧力比例
制御弁７を約１秒保つ保持回路１７が動作して似るので
、点火しやすいガスｆｉＬカ第２ガヌバーナブロック５
ｂに得られ、火は第１ガスバーナブロック５ａから第２
がスバーナブロック５ｂに円滑に移る。その後ガス量と
弁開度はガス量制御域Ｂの０点より多いＲ点に移り出湯
温度センサ８の信号に応じてガス圧力比例制御弁７は制
御される。したがって、ガス電磁弁６が閉の状態から開
の状態に移るとともにガス圧力の低下がなく確実に第１
ガスバーナブロック５ａから第２ガスバーナブロック５
ｂへ火が移せる。On the other hand, while the igniter 10 is operating, the gas pressure proportional control valve 7 is opened by the control device 18, and the gas valve circuit 16 is operated by the signal from the valve opening detection circuit 15 that detects this, and the gas solenoid valve 6 is opened. Gas flows through the first gas burner block 5a and the second gas burner block 5b, the first gas burner block 5a is ignited by the igniter 11, and the flame from this ignites the second burner block 5b. Then, the water passing through the heat exchanger 2 is heated and the heated hot water is detected by the outlet temperature sensor 8, and the gas pressure proportional control valve 7 adjusts the gas amount so that the temperature reaches the temperature set in the outlet temperature setting section 1. controlled. Therefore, when the water is squeezed using the faucet 9, the amount of water decreases, and the opening degree of the gas pressure proportional control valve 7 decreases in an attempt to maintain the set temperature. Here, the gas amount and the opening degree of the gas pressure proportional control valve 7 are shown as shown in FIG. As described above, when the first gas burner block 5a and the second gas burner block 5b are burning at the same time, the gas amount is controlled in the gas amount control region B. Therefore, as mentioned above, when the opening degree decreases, it reaches the 0 point. When this point is reached, the minimum valve opening detection circuit 13 is activated, and when this state continues for several seconds, the timer circuit 14 is activated, the gaff valve circuit 16 is activated, the gas solenoid valve 6 is closed, and the gas 1 and opening are activated. is controlled so that it is at point P. When only the first gas burner block 5a is open, the gas amount is controlled in the gas amount control region A. Next, the faucet 9 is slightly opened again and as the amount of water increases, the amount of gas also increases. Then, in the gas amount control area A, a point Q is reached where a larger amount of gas than point P is produced. Then, the valve opening detection circuit 1 detects the opening of about 60% of the gas pressure proportional control valve 7.
5 detects and operates, and the gas valve circuit 16 operates,
The gas solenoid valve 6 is opened and the second one supplies gas to the svarna block 5b. At this time, the holding circuit 17 that maintains the gas pressure proportional control valve 7 for about 1 second at the same opening (approximately 6096 or more) as when the valve opening detecting circuit 15 operates operates in a similar manner, so the gas fiL is easily ignited. 2nd Ganubhana Block 5
b, and the fire flows from the first gas burner block 5a to the second gas burner block 5a.
is smoothly transferred to the svarna block 5b. Thereafter, the gas amount and valve opening degree shift to point R, which is greater than 0 point, in gas amount control region B, and gas pressure proportional control valve 7 is controlled in accordance with the signal from hot water temperature sensor 8. Therefore, when the gas solenoid valve 6 moves from the closed state to the open state, the gas pressure does not drop and the first
Gas burner block 5a to second gas burner block 5
The fire can be transferred to b.
発明の効果
以上のように本発明のガス瞬間式給湯器によれば、ガス
圧が少なくならないうちに第１ガスバーナブロックから
第２ガスバーナブロックに火移りさせるため、火移りが
遅れ未燃ガスが出たり、大きな音が出たりしないように
させることができる。Effects of the Invention As described above, according to the instantaneous gas water heater of the present invention, since the flame transfers from the first gas burner block to the second gas burner block before the gas pressure decreases, the transfer of the flame is delayed and unburned gas is produced. You can also prevent loud sounds from being emitted.
第１図は本発明の一実施例を示すがヌ瞬間式給湯器のブ
ロック図、第２図は同がス圧力比例制御弁の開度とガス
量の関係を示した制御図、第３図は従来例のブロック図
、第４図は同じくガス圧力比例制御弁の開度とガス量を
示す制御図である。
５ａ・・・・・・第１ガスバーナブロック、５ｂ・・・
・・・第２ガスバーナブロック、６・・・・・・ガス電
磁弁、７・・・・・・ガス圧力比例制御弁、１３・・・
・・・最少弁開度検出回路、１４・・・・・−タイマ回
路、１５・・・・・・弁開度検出回路、１６・・・・・
・ガス弁回路、１７・・・・・・保持回路、１８・・・
・・・制御装置。Fig. 1 is a block diagram of an instantaneous water heater showing an embodiment of the present invention, Fig. 2 is a control diagram showing the relationship between the opening degree of the pressure proportional control valve and the gas amount, and Fig. 3 is a block diagram of an instantaneous water heater. is a block diagram of the conventional example, and FIG. 4 is a control diagram showing the opening degree and gas amount of the gas pressure proportional control valve. 5a...first gas burner block, 5b...
...Second gas burner block, 6...Gas solenoid valve, 7...Gas pressure proportional control valve, 13...
...Minimum valve opening detection circuit, 14...-timer circuit, 15...Valve opening detection circuit, 16...
・Gas valve circuit, 17...Holding circuit, 18...
···Control device.
Claims (1)
たガスを燃焼させる第１ガスバーナブロックと、この第
１ガスバーナブロックへ通じるガス通路より分岐した第
２ガスバーナブロックと、この第２ガスバーナブロック
へ流れるガスを止めたり、流したりするガス電磁弁と、
前記ガス電磁弁が開いていて、第１ガスバーナブロック
と、第２ガスバーナブロックが同時に燃焼しているとき
にガス圧力比例制御弁の最少開度になっていることを検
知する最少弁開度検出回路と、最少弁開度が数秒間連続
していることを検知するタイマ回路と、前記ガス電磁弁
が閉の状態で第１ガスバーナブロックだけで燃焼してい
るときに、ガス圧力比例制御弁の開度が所定の開度以上
である状態が所定時間続いたことを検出する弁開度検出
回路と、この回路が動作した後、前記ガス電磁弁を開く
ガス弁回路と、前記ガス電磁弁が開いた後、前記所定の
開度を検出した状態で所定時間その開度を保つ保持回路
と、これらを制御する制御装置とからなる給湯器。A gas pressure proportional control valve, a first gas burner block that burns the gas emitted from the gas pressure proportional control valve, a second gas burner block that branches from a gas passage leading to the first gas burner block, and a second gas burner block that branches off from the gas passage leading to the first gas burner block. A gas solenoid valve that stops or starts flowing gas,
a minimum valve opening detection circuit that detects that the gas pressure proportional control valve is at the minimum opening when the gas solenoid valve is open and the first gas burner block and the second gas burner block are burning simultaneously; and a timer circuit that detects that the minimum valve opening continues for several seconds, and a timer circuit that detects when the gas pressure proportional control valve opens when the gas solenoid valve is closed and combustion is occurring only in the first gas burner block. a valve opening detection circuit that detects that the degree of opening has continued for a predetermined time or more; a gas valve circuit that opens the gas solenoid valve after this circuit is activated; and a gas valve circuit that opens the gas solenoid valve. The water heater comprises a holding circuit that detects the predetermined opening degree and then maintains the opening degree for a predetermined period of time, and a control device that controls these circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152466A JPH0799258B2 (en) | 1986-06-27 | 1986-06-27 | Water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152466A JPH0799258B2 (en) | 1986-06-27 | 1986-06-27 | Water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6314012A true JPS6314012A (en) | 1988-01-21 |
| JPH0799258B2 JPH0799258B2 (en) | 1995-10-25 |
Family
ID=15541126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61152466A Expired - Lifetime JPH0799258B2 (en) | 1986-06-27 | 1986-06-27 | Water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0799258B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5574971A (en) * | 1978-11-28 | 1980-06-05 | Mitsubishi Electric Corp | Elevator |
| JPS56162272U (en) * | 1980-05-06 | 1981-12-02 | ||
| JPS56170175U (en) * | 1980-05-20 | 1981-12-16 |
-
1986
- 1986-06-27 JP JP61152466A patent/JPH0799258B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5574971A (en) * | 1978-11-28 | 1980-06-05 | Mitsubishi Electric Corp | Elevator |
| JPS56162272U (en) * | 1980-05-06 | 1981-12-02 | ||
| JPS56170175U (en) * | 1980-05-20 | 1981-12-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0799258B2 (en) | 1995-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |