JPS6241013Y2 - - Google Patents
Info
- Publication number
- JPS6241013Y2 JPS6241013Y2 JP1982016671U JP1667182U JPS6241013Y2 JP S6241013 Y2 JPS6241013 Y2 JP S6241013Y2 JP 1982016671 U JP1982016671 U JP 1982016671U JP 1667182 U JP1667182 U JP 1667182U JP S6241013 Y2 JPS6241013 Y2 JP S6241013Y2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- oil temperature
- signal
- hydraulic
- speed command
- 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
- 239000003921 oil Substances 0.000 claims description 32
- 238000001514 detection method Methods 0.000 claims description 13
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 5
- 230000001174 ascending effect Effects 0.000 description 3
- 238000009429 electrical wiring Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Types And Forms Of Lifts (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は油圧エレベータの速度制御装置に係
り、特に作動油の温度変化に起因する速度特性へ
の悪影響を補正する装置の改良に関するものであ
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a speed control device for a hydraulic elevator, and particularly relates to an improvement of a device that corrects the adverse effect on speed characteristics caused by temperature changes in hydraulic fluid. .
［従来技術］
従来の油圧エレベータは、エレベータ乗かごの
位置に応じて制御弁の弁開度をある定まつた値に
設定するオープンループ制御方式が一般的であつ
たため、エレベータの積載荷重等の変化によりエ
レベータ乗かごの速度が著しく変動する欠点があ
つた。[Prior Art] Conventional hydraulic elevators generally used an open-loop control system in which the valve opening of the control valve was set to a certain fixed value depending on the position of the elevator car. There was a drawback that the speed of the elevator car fluctuated significantly due to the change.
このため、面積流量計を用いてエレベータかご
の速度を等価的に検出し、比例電磁弁で速度制御
する方式の速度帰還形油圧エレベータが近時提案
されている。しかし、面積流量計でエレベータの
速度を検出する場合にも、第１図からわかるよう
に気温変化等による油温変化によつて油の粘性が
変化するため、エレベータの速度を正確に検出す
ることができず、検出誤差が出易いという問題が
あつた。 For this reason, a speed feedback type hydraulic elevator has recently been proposed in which the speed of the elevator car is equivalently detected using an area flow meter and the speed is controlled using a proportional solenoid valve. However, even when detecting the speed of an elevator using an area flowmeter, as shown in Figure 1, the viscosity of the oil changes due to changes in oil temperature due to changes in air temperature, etc., so it is difficult to accurately detect the speed of the elevator. There was a problem that detection errors were likely to occur.
したがつて、例えば第２図に示すように、速度
帰還回路における面積流量計１９の後段に油温検
出素子を内蔵した速度信号補正装置２３を設け
て、油温の変化による面積流量計１９の検出誤差
を補正して速度特性を良好に保とうとする速度制
御装置がまず考えられる。即ち、第２図中１はシ
リンダ、２はプランジヤ、３は乗かご、４はタン
ク、５はストレーナ、６はポンプ、７は電動機、
８は逆止弁、９，１０，１１は主管路、１２は上
昇用油圧制御弁、１３は上昇用油圧制御弁１２と
主管路９とを結合する管路、１４は上昇用油圧制
御弁１２を操作するソレノイド、１５は下降用油
圧制御弁、１６は下降用油圧制御弁１５と主管路
１０とを結合する管路、１７は下降用油圧制御弁
１５を操作するソレノイド、１８はリリーフ弁、
１９は面積流量計、２０は速度指令発生装置、２
１は比較器、２２は増幅器、２３は速度信号補正
装置で、内部に油温検出素子を内蔵し例えば抵
抗、可変抵抗、オペアンプとで反転増幅器を構成
している。尚、油温検出素子はタンク４あるいは
管路１０，１１等に設けられ、例えばサーミスタ
のように抵抗値が変化するものである。２４は面
積流量計１９と速度信号補正装置２３とを接続す
る電気配線、２５は速度信号補正装置２３と比較
器２１とを接続する電気配線、２６は増幅器２２
とソレノイド１４とを接続する電気配線、２７は
増幅器２２とソレノイド１７とを接続する電気配
線、RY１ａは上昇運転指令が発せられる所定時
間後に閉路し、乗かごが減速点に達すると開路す
る常開接点、RY２ａは上昇中の乗かごが減速点
に達すると閉路し、停止点に達すると開路する常
開接点、RY３ａは下降運転指令が発せられると
所定時間後に閉路し、乗かごが減速点に達すると
開路する常開接点、RY４ａは下降中の乗かごが
減速点に達すると閉路し、停止点に達すると開路
する常開接点である。 Therefore, as shown in FIG. 2, for example, a speed signal correction device 23 having a built-in oil temperature detection element is provided downstream of the area flow meter 19 in the speed feedback circuit to correct the area flow meter 19 due to changes in oil temperature. A first consideration is a speed control device that attempts to maintain good speed characteristics by correcting detection errors. That is, in Fig. 2, 1 is a cylinder, 2 is a plunger, 3 is a car, 4 is a tank, 5 is a strainer, 6 is a pump, 7 is an electric motor,
8 is a check valve; 9, 10, and 11 are main pipes; 12 is a rising hydraulic control valve; 13 is a pipe connecting the rising hydraulic control valve 12 and the main pipe 9; 14 is a rising hydraulic control valve 12. 15, a descending hydraulic control valve; 16, a pipe line connecting the descending hydraulic control valve 15 and the main pipeline 10; 17, a solenoid that operates the descending hydraulic control valve 15; 18, a relief valve;
19 is an area flowmeter, 20 is a speed command generator, 2
Reference numeral 1 denotes a comparator, 22 an amplifier, and 23 a speed signal correction device, which includes an oil temperature detection element therein and constitutes an inverting amplifier with, for example, a resistor, a variable resistor, and an operational amplifier. The oil temperature detection element is provided in the tank 4 or the pipes 10, 11, etc., and has a variable resistance value, such as a thermistor. 24 is electrical wiring connecting the area flowmeter 19 and the speed signal correction device 23; 25 is electrical wiring connecting the speed signal correction device 23 and the comparator 21; 26 is the amplifier 22;
27 is an electrical wiring that connects the amplifier 22 and the solenoid 17, and RY1a is a normally open circuit that closes after a predetermined time when the ascending operation command is issued and opens when the car reaches the deceleration point. The contact, RY2a, is a normally open contact that closes when the car reaches the deceleration point while it is ascending, and opens when it reaches the stop point.RY3a closes after a predetermined time when the descending operation command is issued, and the car reaches the deceleration point. RY4a is a normally open contact that opens when the descending car reaches the deceleration point, and opens when the car reaches the stop point.
次に、図面を用いてこの装置の動作について説
明する。 Next, the operation of this device will be explained using the drawings.
(a) 上昇運転の場合
上昇運転指令が発せられるとまず電動機７が起
動し、ポンプ６を駆動する。ポンプ６の吐出油は
主管路９、管路１３及び上昇用油圧制御弁１２を
介してタンク４に排出され、タンク内の油が循環
する。次に、上昇運転指令が発せられ所定時間後
に接点RY１ａが閉路すると、速度指令発生装置
２０に加速指令が入力され、速度指令発生装置２
０は第３図で示すように徐々に増加して後所定値
を維持する速度指令信号ＶPを出力する。速度指
令発生装置２０から速度指令信号ＶPが出力され
ると、比較器２１は速度指令信号ＶPと後述する
速度信号補正装置２３の出力信号Vs（以下、速
度帰還信号Vsと称す）とを比較して、その差の
出力が増幅器２２を介してソレノイド１４を磁励
し上昇用油圧制御弁１２の開口部を自動的に絞り
調整し、ポンプ６の吐出油をシリンダ１に供給さ
せ、プランジヤ２を押し上げ乗かご３を加速して
所定の定格運転を行う。(a) In the case of upward operation When the upward operation command is issued, the electric motor 7 is first started and drives the pump 6. The oil discharged from the pump 6 is discharged into the tank 4 via the main pipe line 9, the pipe line 13, and the rising hydraulic control valve 12, and the oil in the tank is circulated. Next, when a rising operation command is issued and contact RY1a closes after a predetermined time, an acceleration command is input to the speed command generator 20, and the speed command generator 2
0 outputs a speed command signal V P that gradually increases and then maintains a predetermined value as shown in FIG. When the speed command signal V P is output from the speed command generation device 20, the comparator 21 outputs the speed command signal V P and the output signal Vs of the speed signal correction device 23 (hereinafter referred to as speed feedback signal Vs), which will be described later. By comparison, the output of the difference magnetically excites the solenoid 14 via the amplifier 22, automatically adjusts the opening of the lift hydraulic control valve 12, supplies the oil discharged from the pump 6 to the cylinder 1, and controls the plunger. 2 and accelerates the car 3 to perform a predetermined rated operation.
次に乗かごが減速点に達すると接点RY１ａが
開路し、接点RY２ａが閉路することにより、速
度指令発生装置２０には減速指令が与えられ、速
度指令信号ＶPを第３図に示すように徐々に減少
させ小さな所定の信号値に落ち着かせる。やがて
乗かごが停止点に達すると、接点RY２ａが開路
することにより、速度指令発出装置２０には停止
指令が与えられるため、速度指令信号ＶPは第３
図に示すように零電圧になる。 Next, when the car reaches the deceleration point, the contact RY1a opens and the contact RY2a closes, so that a deceleration command is given to the speed command generator 20, and the speed command signal V P is output as shown in FIG. Gradually decrease the signal value and let it settle to a small predetermined signal value. When the car eventually reaches the stop point, contact RY2a opens and a stop command is given to the speed command issuing device 20, so the speed command signal V P
As shown in the figure, the voltage becomes zero.
このような速度指令信号ＶPに乗かごの実際速
度が追従するように、主管路１０，１１に流れる
油量を面積流量計１９により検出して乗かごの速
度信号ＶSOを検出し速度帰還制御が行われる。 In order for the actual speed of the car to follow such a speed command signal V P , the amount of oil flowing in the main pipes 10 and 11 is detected by the area flow meter 19, the speed signal V SO of the car is detected, and the speed is returned. Control takes place.
ところで、速度信号補正装置２３のゲイン特性
は第４図のように油温の高い場合には大きく、低
い場合には小さく変化させるので、結果として、
面積流量計１９を通過する作動油流量対速度帰還
信号ＶSは第５図に示す如く、油温状態にかかわ
らずほぼ一定の比例特性をもつことになり、エレ
ベータ乗かごの実際速度を第６図に示すように油
温状態に関係なく常にほぼ一定の理想速度とさせ
ることができる。 By the way, as shown in FIG. 4, the gain characteristics of the speed signal correction device 23 are changed greatly when the oil temperature is high, and changed small when the oil temperature is low, so as a result,
As shown in FIG. 5, the hydraulic oil flow rate vs. speed feedback signal V S passing through the area flow meter 19 has a nearly constant proportional characteristic regardless of the oil temperature state, and the actual speed of the elevator car can be expressed as As shown in the figure, it is possible to maintain a substantially constant ideal speed regardless of the oil temperature state.
(b) 下降運転の場合
下降運転指令が発せられ接点RY３ａが閉路す
ると上昇運転の場合と同様、速度指令信号ＶPと
かご速度帰還信号ＶSとを比較器２１で比較し、
その差の出力が増幅器２２を介してソレノイド１
７を励磁して下降用油圧制御弁１５を開き、自動
的に絞り調整を行い、シリンダ１内の圧油を主管
路１１，１０、管路１６および下降用油圧制御弁
１５を介して排出させる。したがつてブランジヤ
２は押し上げられ、乗かご３は加速して下降の定
格運転を行う。(b) In the case of descending operation When the descending operation command is issued and contact RY3a is closed, the comparator 21 compares the speed command signal V P and the car speed feedback signal V S , as in the case of ascending operation.
The output of the difference is sent to the solenoid 1 via the amplifier 22.
7 is excited to open the descending hydraulic control valve 15, the throttle is automatically adjusted, and the pressure oil in the cylinder 1 is discharged via the main pipes 11, 10, the pipe 16, and the descending hydraulic control valve 15. . Therefore, the plunger 2 is pushed up, and the car 3 is accelerated to perform a rated downward operation.
次に乗かごが減速点に達すると接点RY３ａが
開路し、接点RY４ａが閉路することにより速度
指令信号ＶPが上昇運転の場合と同様に変化す
る。乗かごはこの速度指令信号ＶPに追従するよ
うに制御され、停止点に達すると接点RY４ａの
開路により停止する。 Next, when the car reaches the deceleration point, the contact RY3a opens and the contact RY4a closes, causing the speed command signal V P to change in the same way as in the case of upward operation. The car is controlled to follow this speed command signal VP , and when it reaches a stopping point, it stops by opening the contact RY4a.
以上説明したようにこの装置は、油温に応じて
抵抗値が変化する油温検出素子を利用して速度帰
還回路における速度信号を修正し、できるだけ実
際の乗かご速度を検出するようにして、良好な速
度帰還制御を行うようにしたものである。 As explained above, this device corrects the speed signal in the speed feedback circuit by using an oil temperature detection element whose resistance value changes depending on the oil temperature, and detects the actual car speed as much as possible. It is designed to perform good speed feedback control.
［考案が解決しようとする問題点］
しかし、このように速度帰還回路に面積流量計
の感度を補正する補正装置を挿入するような手段
では、いたずらに帰還回路を複雑にしてしまい、
最も危険な速度帰還信号の喪失機会等を否応なく
増やす結果となつて、安全性の低下を招くことに
なる。[Problems to be solved by the invention] However, such a method of inserting a correction device for correcting the sensitivity of the area flowmeter into the velocity feedback circuit unnecessarily complicates the feedback circuit.
This inevitably increases the chance of losing the speed feedback signal, which is the most dangerous, resulting in a decrease in safety.
即ち、速度信号補正装置２３を構成するオペア
ンプ等の半導体素子については、十分な信頼性は
あるものの、故障した場合の形態が一様ではな
く、正負の電源電圧に振り切れる故障あるいは零
ボルトに落ちる故障などがあり、さしずめ零ボル
トに落ちる故障や正帰還となる極性への電源電圧
に振り切れる故障では正常な速度帰還制御が不可
能なだけでなく、エレベータ乗かごが暴走してし
まい甚だ危険である。 That is, although semiconductor elements such as operational amplifiers that constitute the speed signal correction device 23 have sufficient reliability, the forms of failure are not uniform, and failures that swing between positive and negative power supply voltages or drop to zero volts occur. If there is a failure, such as a failure that suddenly drops to zero volts or a failure that causes the power supply voltage to swing to the positive feedback polarity, not only will normal speed feedback control be impossible, but the elevator car will run out of control, which is extremely dangerous. be.
本考案は上記の点に鑑みなされたもので、作動
油の温度が変化しても安全性を損なわずに常に良
好な速度制御を行い得る油圧エレベータの速度制
御装置を提供することを目的とする。 The present invention was devised in view of the above points, and aims to provide a speed control device for a hydraulic elevator that can always perform good speed control without compromising safety even when the temperature of hydraulic oil changes. .
［問題点を解決するための手段］
第７図は本考案の一実施例を示す油圧エレベー
タの速度制御装置の全体の構成図であり、図中第
２図と同一符号のものは同一のものを示すが、４
３は速度指令発出装置２０の段部に挿入された速
度指令補正装置で、オペアンプOPと抵抗Ｒと可
変抵抗VRとサーミスタ等の油温検出素子４４と
で構成され、油温検出素子４４は温度が高い場合
には抵抗値が小となり速度指令補正装置４３のゲ
インが小さく、油温が低い場合には抵抗値が大と
なり速度指令補正装置４３のゲインが大きくなる
ように、オペアンプOPの負帰還回路に挿入され
ている。[Means for solving the problem] Fig. 7 is an overall configuration diagram of a speed control device for a hydraulic elevator showing an embodiment of the present invention, and the same reference numerals as in Fig. 2 are the same. 4
Reference numeral 3 denotes a speed command correction device inserted into the step part of the speed command issuing device 20, which is composed of an operational amplifier OP, a resistor R, a variable resistor VR, and an oil temperature detection element 44 such as a thermistor. When the oil temperature is high, the resistance value is small and the gain of the speed command correction device 43 is small, and when the oil temperature is low, the resistance value is large and the gain of the speed command correction device 43 is large. inserted into the circuit.
従つて、速度帰還回路には手を加えていないた
め、極めて公共性の高いエレベータの安全性を維
持できるだけでなく、万一油温変化による面積流
量計の検出誤差が生じても、速度指令値を油温が
高くなるに従い相対的に小さくさせ適当な大きさ
に変化させることにより、吸収することができ、
常に良好な速度制御特性を有する制御装置が得ら
れるものである。 Therefore, since no modifications have been made to the speed feedback circuit, not only can the safety of highly public elevators be maintained, but even if a detection error of the area flow meter occurs due to changes in oil temperature, the speed command value can be maintained. can be absorbed by making it relatively smaller and changing to an appropriate size as the oil temperature increases,
A control device that always has good speed control characteristics can be obtained.
因に、本考案による半導体素子で構成された速
度指令補正装置も従来技術の場合と同様に故障す
ることが考えられるが、零ボルトに落ちる故障の
場合にはエレベータの乗かごの速度が零になるフ
エイルセイフ側の故障であり、電源電圧に振り切
れる故障であつても、速度帰還制御が不能になる
わけではないので、エレベータ乗かごが暴走する
ことはない。又、電源電圧に振り切れる故障につ
いては簡単なリミツター回路を追加してできるだ
け正常な電圧レベルの範囲に抑え安全性を向上さ
せることもできる。 Incidentally, it is conceivable that the speed command correction device composed of semiconductor elements according to the present invention may fail in the same way as the conventional technology, but in the case of a failure that drops to zero volts, the speed of the elevator car will drop to zero. This is a fail-safe failure, and even if it is a failure that can be overcome by the power supply voltage, speed feedback control will not become impossible, so the elevator car will not run out of control. Furthermore, for failures that can be caused by the power supply voltage, it is possible to add a simple limiter circuit to suppress the voltage level as much as possible within the normal range, thereby improving safety.
尚、実施例では速度指令補正装置を速度指令発
生装置の後段に設けた例について述べたが、速度
指令発生装置の中に補正装置を組み入れて本考案
の装置を構成することもできる。 In the embodiment, an example has been described in which the speed command correction device is provided at a stage subsequent to the speed command generation device, but the correction device can also be incorporated into the speed command generation device to configure the device of the present invention.
［考案の効果］
以上述べたように本考案によれば、作動油の温
度変化に応じて、即ち油温が高くなるに従い速度
指令信号の値を相対的に小さくさせる速度指令補
正装置を通じて速度帰還制御を行うため、安全性
及び制御性能の良好な速度制御装置を得ることが
できる。[Effects of the invention] As described above, according to the invention, speed feedback is achieved through a speed command correction device that relatively decreases the value of the speed command signal according to changes in the temperature of the hydraulic oil, that is, as the oil temperature increases. Since the control is performed, a speed control device with good safety and control performance can be obtained.
第１図は面積流量計の作動油流量対出力信号の
特性図、第２図は従来の油圧エレベータの速度制
御装置の一例を示す全体構成図、第３図は第２図
の速度指令信号ＶPの波形図の一例、第４図は第
２図の速度補正装置２３のゲイン特性図、第５図
は第２図の作動油流量対速度帰還信号ＶSの特性
図、第６図は第２図のかご実際速度の波形図、第
７図は本考案の一実施例を示す油圧エレベータの
速度制御装置の全体構成図である。
３……乗かご、９，１０，１１，１３，１６…
…管路、１９……面積流量計、２０……速度指令
発生装置、２１……比較器、４３……速度指令補
正装置、４４……油温検出素子、ＶP……速度指
令信号、ＶSO……乗かご速度信号、OP……オペ
アンプ、Ｒ……抵抗、VR……可変抵抗。
Fig. 1 is a characteristic diagram of the hydraulic oil flow rate versus output signal of an area flowmeter, Fig. 2 is an overall configuration diagram showing an example of a conventional hydraulic elevator speed control device, and Fig. 3 is a speed command signal V of Fig. 2. An example of a waveform chart of P , Fig. 4 is a gain characteristic diagram of the speed correction device 23 in Fig. 2, Fig. 5 is a characteristic diagram of hydraulic oil flow rate versus speed feedback signal V S in Fig. 2, and Fig. 6 is a characteristic diagram of the speed feedback signal V S in Fig. 2. FIG. 2 is a waveform diagram of the actual car speed, and FIG. 7 is an overall configuration diagram of a speed control device for a hydraulic elevator showing an embodiment of the present invention. 3... Car, 9, 10, 11, 13, 16...
... Pipeline, 19 ... Area flow meter, 20 ... Speed command generator, 21 ... Comparator, 43 ... Speed command correction device, 44 ... Oil temperature detection element, V P ... Speed command signal, V SO : Car speed signal, OP: Operational amplifier, R: Resistor, VR: Variable resistor.
Claims (1)
の速度を等価的に検出し乗かご速度信号を出力
する面積流量計を設け、加速指令が発せられる
と徐々に増加して後所定値を維持し、減速点に
達し減速指令が発せられると徐々に減少して零
になる速度指令信号を出力する速度指令発生装
置を設け、該速度指令発生装置の前記速度指令
信号と前記面積流量計の前記乗かご速度信号と
を比較して、その差の信号により油圧制御弁が
制御され油圧エレベータが速度制御されるもの
において、 前記作動油の油温を検出する油温検出素子を
備え前記油温が高くなるに従い前記速度指令信
号の値を小さくさせる働きを有する速度指令補
正装置を前記速度指令発生装置の後段に設け、
前記速度指令補正装置の出力信号と前記面積流
量計の前記乗かご速度信号とを比較して前記油
圧制御弁を制御することを特徴とする油圧エレ
ベータの速度制御装置。 (2) 前記油温検出素子は油温に応じて抵抗値が変
化する素子であることを特徴とする実用新案登
録請求の範囲第１項記載の油圧エレベータの速
度制御装置。 (3) 前記速度指令補正装置はオペアンプと抵抗と
可変抵抗と油温検出素子とで回路構成され、油
温が高い場合にはゲインが小さく、油温が低い
場合にはゲインが大きくなるように、前記油温
検出素子を前記オペアンプの負帰還回路に挿入
したことを特徴とする実用新案登録請求の範囲
第１項記載の油圧エレベータの速度制御装置。[Scope of Claim for Utility Model Registration] (1) An area flowmeter is installed in the pipe through which hydraulic oil flows, which equivalently detects the speed of the elevator car and outputs a car speed signal, and when an acceleration command is issued, A speed command generation device is provided that outputs a speed command signal that gradually increases and then maintains a predetermined value, and then gradually decreases to zero when a deceleration point is reached and a deceleration command is issued, The speed command signal and the car speed signal of the area flowmeter are compared, and the hydraulic control valve is controlled by the difference signal to control the speed of the hydraulic elevator, and the temperature of the hydraulic oil is detected. A speed command correction device including an oil temperature detection element and having a function of decreasing the value of the speed command signal as the oil temperature increases is provided at a stage subsequent to the speed command generation device,
A speed control device for a hydraulic elevator, characterized in that the output signal of the speed command correction device and the car speed signal of the area flowmeter are compared to control the hydraulic control valve. (2) The speed control device for a hydraulic elevator according to claim 1, wherein the oil temperature detection element is an element whose resistance value changes depending on the oil temperature. (3) The speed command correction device has a circuit configuration including an operational amplifier, a resistor, a variable resistor, and an oil temperature detection element, and the gain is small when the oil temperature is high, and becomes large when the oil temperature is low. The speed control device for a hydraulic elevator according to claim 1, wherein the oil temperature detection element is inserted into a negative feedback circuit of the operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1667182U JPS58120162U (en) | 1982-02-08 | 1982-02-08 | Hydraulic elevator speed control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1667182U JPS58120162U (en) | 1982-02-08 | 1982-02-08 | Hydraulic elevator speed control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58120162U JPS58120162U (en) | 1983-08-16 |
| JPS6241013Y2 true JPS6241013Y2 (en) | 1987-10-20 |
Family
ID=30029030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1667182U Granted JPS58120162U (en) | 1982-02-08 | 1982-02-08 | Hydraulic elevator speed control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58120162U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0751904B2 (en) * | 1986-09-05 | 1995-06-05 | 日野自動車工業株式会社 | Timing control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5642584U (en) * | 1979-09-10 | 1981-04-18 | ||
| JPS5682775A (en) * | 1979-12-10 | 1981-07-06 | Hitachi Ltd | Oil pressure elevator |
-
1982
- 1982-02-08 JP JP1667182U patent/JPS58120162U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5642584U (en) * | 1979-09-10 | 1981-04-18 | ||
| JPS5682775A (en) * | 1979-12-10 | 1981-07-06 | Hitachi Ltd | Oil pressure elevator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58120162U (en) | 1983-08-16 |
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