JPH0117527B2 - - Google Patents
Info
- Publication number
- JPH0117527B2 JPH0117527B2 JP3613582A JP3613582A JPH0117527B2 JP H0117527 B2 JPH0117527 B2 JP H0117527B2 JP 3613582 A JP3613582 A JP 3613582A JP 3613582 A JP3613582 A JP 3613582A JP H0117527 B2 JPH0117527 B2 JP H0117527B2
- Authority
- JP
- Japan
- Prior art keywords
- flip
- flop
- circuit
- rotation
- detection elements
- 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
- 238000001514 detection method Methods 0.000 claims description 32
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
- G01D5/2451—Incremental encoders
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、回転数計数装置に関し、特に電力潮
流中における電力量を測る誘導形電力量計の円板
のような回転体の回転数の計数に適した装置に関
する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a rotation speed counting device, and in particular to counting the rotation speed of a rotating body such as a disk of an inductive watt-hour meter that measures the amount of electric power in a power flow. Regarding equipment suitable for.
電力が潮流する電力系統中に配置された誘導形
電力量計の円板は、電力の流れの向きによつて正
転のみならず逆転もすることが知られている。仮
に、円板を正転させる向き（正方向）にP1の電
力量が流れ、次いで円板を逆転させる向き（逆方
向）にP2の電力量が流れ、しかる後再び正方向
にP3の電力量が流れたとする。この場合、P1−
P2＋P3を求めることが要求される。即ち、所定
回転角毎にパルスを発生し、これを計数する型の
電力量計においては、−P2の逆方向電力が流れる
期間およびこれに続く＋P3の正方向電力が流れ
る期間のうちの−P2と絶対値が等しい＋P2の正
方向電力が流れる期間にパルスが発生しないよう
に、または発生されたパルスを無視することが要
求される。しかし、P2は一般には大きくなく、
また簡易な回路に大きなP2に対しても上記のよ
うな機能を持たせることは困難なので、１回転以
下の所定の回転角（逆転許容角）の範囲内で上記
の機能を持たせ、それ以上の範囲については、機
械的な阻止機構等により逆転を阻止するようにし
ているが、当然この逆転許容角は大きい方がよ
い。しかるに、従来の回転計数装置は、逆転許容
角が小さく、また検出素子の数に対して１回転当
りの発生パルス数が少いという欠点があつた。
It is known that the disk of an inductive watt-hour meter placed in a power system through which power flows not only rotates forward but also reverses depending on the direction of the flow of power. Suppose that an amount of power P 1 flows in the direction that rotates the disk in the normal direction (forward direction), then an amount of power P 2 flows in the direction that reverses the disk (reverse direction), and then P 3 flows again in the positive direction. Suppose that the amount of electricity flows. In this case, P 1 −
It is required to find P 2 + P 3 . In other words, in a type of watt-hour meter that generates a pulse at every predetermined rotation angle and counts the pulses, the period during which -P 2 reverse power flows and the subsequent period when +P 3 forward power flows. It is required that no pulses occur or that pulses that are generated be ignored during the period when a positive power of +P 2 with an absolute value equal to −P 2 flows. However, P 2 is generally not large;
In addition, it is difficult to provide the above function in a simple circuit even for a large P 2 , so it is necessary to provide the above function within a predetermined rotation angle (reversal allowable angle) of 1 revolution or less. Regarding the above range, a mechanical blocking mechanism or the like is used to prevent reversal, but it is natural that this reversal allowable angle should be larger. However, conventional rotation counting devices have the disadvantage that the permissible angle for reverse rotation is small and the number of pulses generated per rotation is small relative to the number of detection elements.
本発明の目的は、１回転当たりの発生パルス数
を検出素子の数と等しくすることができ、また逆
転許容角を大きくすることができる回転数計数装
置を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a rotational speed counting device that can make the number of pulses generated per rotation equal to the number of detection elements and can increase the permissible reversal angle.
本発明は、検出素子に対応してフリツプフロツ
プ回路が設けられ、各フリツプフロツプ回路は、
対応する検出素子が被検出部を検出し、かつ前段
の（対応する検出素子の、回転体の正転方向につ
き上流側に位置する検出素子に対応する）フリツ
プフロツプ回路がセツト状態にあるときにセツト
され、後段のフリツプフロツプ回路がセツト状態
にあるときにリセツトされるように接続され、い
ずれかのフリツプフロツプ回路がリセツト状態か
らセツト状態に変化したときにパルスが発生し
て、これが計数されるものである。
In the present invention, flip-flop circuits are provided corresponding to the detection elements, and each flip-flop circuit has the following characteristics:
Set when the corresponding detection element detects the detected part and the flip-flop circuit at the previous stage (corresponding to the detection element located upstream of the corresponding detection element in the normal rotation direction of the rotating body) is in the set state. It is connected so that it is reset when the subsequent flip-flop circuit is in the set state, and when any flip-flop circuit changes from the reset state to the set state, a pulse is generated and this pulse is counted. .
第１図は本発明の回転数計数装置の一実施例を
示したものである。同図において、Ｄは信号円
板、K1，K2，K3は信号円板Ｄの回転を検出する
検出素子、Ｐは検出素子K1，K2，K3の出力を受
け、通常はこれらからのパルスを出力する一方、
逆転中および逆転に続く正転中に逆転角と同じ角
度だけ正転する間、検出素子からのパルスを阻止
する信号処理回路、Ｃは信号処理回路Ｐからのパ
ルスを計数するカウンタである。
FIG. 1 shows an embodiment of the rotational speed counting device of the present invention. In the figure, D is a signal disk, K 1 , K 2 , and K 3 are detection elements that detect the rotation of the signal disk D, and P receives the outputs of the detection elements K 1 , K 2 , and K 3 , and normally While outputting pulses from these,
C is a counter that counts pulses from the signal processing circuit P. C is a signal processing circuit that blocks pulses from the detection element during reverse rotation and normal rotation following reverse rotation by the same angle as the reverse rotation angle.
信号円板Ｄは、電力量の円板軸に同軸状に１：
１の関係で連動するように設けられ、第２図に示
すように回転中心D0に対して角度αを持つた被
検出部、例えば切欠部Daを備えている。 The signal disk D is coaxial with the power disk axis.
1, and as shown in FIG. 2, it is provided with a detected portion, for example, a notch Da, which has an angle α with respect to the center of rotation D 0 .
検出素子K1，K2，K3の各々は、第３図に示す
ように、抵抗１０を介して電池１１の両端子間に
接続されたフオトダイオード１２と、発光ダイオ
ード１２からの光を受けるように配置されたフオ
トトランジスタ１３とを備えたもので、発光ダイ
オード１２とフオトトランジスタ１３とは円板Ｄ
の周縁部を挾むように、即ち、両者間の光の授受
が通常は阻止され、切欠部Daの通過中のみ許容
されるように設けられている。発光ダイオード１
２とフオトトランジスタ１３とを結ぶ光束の円板
Ｄの中心D0に対する中心角はβである。また、
３つの検出素子K1，K2，K3の発光ダイオード１
２、フオトトランジスタ１３の組合せは互いに2/
３πの間隔で配置されている。 Each of the detection elements K 1 , K 2 , and K 3 receives light from a photodiode 12 and a light emitting diode 12 connected between both terminals of a battery 11 via a resistor 10, as shown in FIG. The light-emitting diode 12 and the phototransistor 13 are arranged on a disk D.
In other words, the transmission and reception of light between the two is normally prevented and is allowed only while passing through the notch Da. light emitting diode 1
The central angle of the light beam connecting the phototransistor 2 and the phototransistor 13 with respect to the center D 0 of the disk D is β. Also,
Light emitting diode 1 with three detection elements K 1 , K 2 , K 3
2. The combination of phototransistors 13 is 2/
They are arranged at intervals of 3π.
検出素子K1，K2，K3の各々は、上記のほか、
抵抗１４を介して電池１１に正極端子に、またフ
オトトランジスタ１３を介して電池１１の負極端
子に接続された出力端子１５を備えている。この
結果、出力端子１５の信号レベルは、切欠部Da
がフオトトランジスタ１３の対向している時は
「低」そうでない時は「高」である。 In addition to the above, each of the detection elements K 1 , K 2 , and K 3 has the following characteristics:
The output terminal 15 is connected to a positive terminal of the battery 11 via a resistor 14 and to a negative terminal of the battery 11 via a phototransistor 13. As a result, the signal level of the output terminal 15 is changed to the notch Da
It is "low" when it faces the phototransistor 13, and "high" when it is not.
第４図は信号処理回路Ｐの詳細を示したもので
ある。同図において、I1，I2，I3は検出素子K1，
K2，K3からの信号を反転するインバータ、A1，
A2，A3はインバータI1，I2，I3の出力を一方の入
力とするアンドゲート、F1，F2，F3はアンドゲ
ートA1，A2，A3の出力によりセツトされるフリ
ツプフロツプ回路、M1，M2，M3はフリツプフ
ロツプ回路、F1，F2，F3の出力の立上りととも
に立上り、所定時間後に立下るパルスを発生する
単安定マルチバイブレータ回路、ORは単安定マ
ルチバイブレータ回路M1，M2，M3の出力を入
力とするオアゲートで、その出力は信号処理回路
Ｐの出力としてカウンタＣに与えられる。フリツ
プフロツプ回路F1，F2，F3の出力はそれぞれア
ンドゲートA2，A3，A1の他方の入力に加えられ
るとともに、フリツプフロツプ回路F3，F1，F2
のリセツト入力に加えられる。このように、フリ
ツプフロツプ回路F1，F2，F3は、前段の（即ち、
対応する検出素子K1，K2，K3の、円板Ｄの正転
方向につき上流側に位置する検出素子K3，K1，
K2に対応する）フリツプフロツプ回路F3，F1，
F2の出力を、セツト条件の１つとし、後段のフ
リツプフロツプ回路F2，F3，F1の出力によりリ
セツトされるように接続されている。 FIG. 4 shows details of the signal processing circuit P. In the figure, I 1 , I 2 , I 3 are the detection elements K 1 ,
Inverter that inverts the signals from K 2 , K 3 , A 1 ,
A 2 and A 3 are AND gates that have the outputs of inverters I 1 , I 2 , and I 3 as one input, and F 1 , F 2 , and F 3 are set by the outputs of AND gates A 1 , A 2 , and A 3 . M 1 , M 2 , M 3 are flip-flop circuits; a monostable multivibrator circuit generates a pulse that rises with the rise of the output of F 1 , F 2 , F 3 and falls after a predetermined time; OR is a monostable This is an OR gate that receives the outputs of the multivibrator circuits M 1 , M 2 , and M 3 as input, and its output is given to the counter C as the output of the signal processing circuit P. The outputs of flip-flop circuits F 1 , F 2 , F 3 are respectively applied to the other inputs of AND gates A 2 , A 3 , A 1 , and the outputs of flip-flop circuits F 3 , F 1 , F 2
added to the reset input. In this way, the flip-flop circuits F 1 , F 2 , F 3 are connected to the previous stage (i.e.,
Of the corresponding detection elements K 1 , K 2 , K 3 , the detection elements K 3 , K 1 , which are located upstream in the normal rotation direction of the disk D;
(corresponding to K 2 ) flip-flop circuits F 3 , F 1 ,
The output of F 2 is used as one of the set conditions, and the circuit is connected so as to be reset by the outputs of flip-flop circuits F 2 , F 3 , and F 1 at the subsequent stage.
第５図は、円板Ｄの期間T1中は正転し、期間
T2中は逆転し、期間T3中は正転した場合の、信
号処理回路Ｐの各部の信号の波形を示したもので
ある。正転期間T1中は、インバータI1，I2，I3の
出力が順次「高」レベルとなり、アンドゲート
A1，A2，A3の出力が順次「高」レベルとなり、
フリツプフロツプ回路F1，F2，F3が順次セツト
される。フリツプフロツプ回路F1，F2，F3がセ
ツトされると、前段のフリツプフロツプ回路F3，
F1，F2がリセツトされる。正回転中においては
１回転につきパルスが３回発生される。 Figure 5 shows that disk D rotates normally during period T 1 ;
This figure shows the waveforms of the signals in each part of the signal processing circuit P when the rotation is reversed during the period T 2 and the rotation is normal during the period T 3 . During the normal rotation period T1 , the outputs of inverters I1 , I2 , and I3 sequentially become "high" level, and the AND gate
The outputs of A 1 , A 2 , and A 3 become "high" level in sequence,
Flip-flop circuits F 1 , F 2 , and F 3 are set in sequence. When the flip-flop circuits F 1 , F 2 , F 3 are set, the previous stage flip-flop circuits F 3 ,
F 1 and F 2 are reset. During forward rotation, three pulses are generated per rotation.
逆転期間T2中には円板Ｄが略π回転し、切欠
部Daが２つの検出素子K1，K2を通過したものと
仮定している。この期間は、フリツプフロツプ回
路F1，F2，F3のいずれにも変化が生じない。こ
のため、信号処理回路Ｐの出力パルスが発生しな
い。例えば、インバータI3の出力が「高」レベル
となつても、このとき前段のフリツプフロツプ回
路F2の出力が「高」レベルにないため、アンド
ゲートA3の出力は「高」レベルとならず、フリ
ツプフロツプ回路F3はセツトされない。従つて、
フリツプフロツプ回路F1はリセツトされない。 It is assumed that during the reversal period T 2 , the disk D rotates approximately π and the notch Da passes through the two detection elements K 1 and K 2 . During this period, no change occurs in any of the flip-flop circuits F 1 , F 2 , and F 3 . Therefore, no output pulse from the signal processing circuit P is generated. For example, even if the output of inverter I3 goes high, the output of flip-flop circuit F2 in the previous stage is not at high level, so the output of AND gate A3 will not go high. , flip-flop circuit F3 is not set. Therefore,
Flip-flop circuit F1 is not reset.
逆転期間T2に続く正転期間T3のうち、円板Ｄ
が逆転したのと同じ量正転する期間T2′中にも、
フリツプフロツプ回路F1，F2，F3のいずれにも
変化が生じない。 During the forward rotation period T3 following the reverse rotation period T2 , the disk D
During the period T 2 ′ in which it rotates forward by the same amount as it reversed,
No change occurs in any of the flip-flop circuits F 1 , F 2 , and F 3 .
第６図は第５図と同様のタイムチヤートである
が、第５図の場合と異なり逆転期間T2が長い場
合を示している。図示のように、逆転が続いて、
切欠部Daが検出素子K1，K3，K2と順次通過した
とすると、逆転開始後３番目の検出素子K2の通
過の際に、フリツプフロツプ回路F2がセツトさ
れ、フリツプフロツプ回路F1がリセツトされる。
このため、単安定マルチバイブレータ回路M2の
出力パルスが発生し、これがオアゲートORを通
つてカウンタＣに与えられる。これは誤パルスで
ある。このように、逆転により円板Ｄの切欠部
Daが３つの検出素子を通過すると、誤パルスが
出る。即ち、逆転許容角（逆転による誤パルスが
発生しない回転角）は2/3π−α−βである。 FIG. 6 is a time chart similar to FIG. 5, but unlike the case in FIG. 5, it shows a case where the reversal period T 2 is long. As shown, the reversal continues,
Assuming that the notch Da passes through the detection elements K 1 , K 3 , and K 2 in sequence, when the third detection element K 2 passes after the start of reverse rotation, the flip-flop circuit F 2 is set and the flip-flop circuit F 1 is set. It will be reset.
Therefore, an output pulse of the monostable multivibrator circuit M2 is generated, which is applied to the counter C through the OR gate OR. This is a false pulse. In this way, by reversing the notch of the disk D,
When Da passes through three detection elements, a false pulse is generated. That is, the allowable reversal angle (rotation angle at which no erroneous pulse occurs due to reversal) is 2/3π-α-β.
以上、検出素子を３個設ける場合について説明
したが、検出素子の数は任意でよい。その数をｍ
とすれば、１回転当りのパルス発生回数もｍとな
り、逆転許容角はｍ−１／ｍ・2π−α−βとなり、
ｍの増加とともに増大する。 Although the case where three detection elements are provided has been described above, the number of detection elements may be arbitrary. m the number
Then, the number of pulses generated per rotation is also m, and the allowable angle of reverse rotation is m-1/m·2π-α-β, which increases as m increases.
以上、回転数計数装置を電力量計に組込むもの
として説明したが、本発明の回転数計数装置は、
水道、ガス等他の積算計器にも組込むことができ
るものである。 Although the rotation speed counting device has been described above as being incorporated into a power meter, the rotation speed counting device of the present invention has the following features:
It can also be incorporated into other integration meters such as water and gas meters.
尚、上記の単安定マルチバイブレータ回路の代
りに例えば微分回路のように、対応するフリツプ
フロツプ回路がリセツト状態からセツト状態に変
化したときにパルスを発生する他の種々の回路を
用いることができる。 It should be noted that instead of the monostable multivibrator circuit described above, various other circuits such as a differentiating circuit can be used which generate a pulse when the corresponding flip-flop circuit changes from the reset state to the set state.
以上のように、本発明によれば、１回転当りの
パルス発生回路を検出素子と同数とすることがで
き、しかも逆転許容角を大きくすることができ
る。
As described above, according to the present invention, the number of pulse generation circuits per rotation can be the same as the number of detection elements, and the allowable reverse rotation angle can be increased.
第１図は本発明の回転数検出装置の一実施例の
全体的構成を示すブロツク図、第２図は信号円板
に対する検出素子の配置を示す概略図、第３図は
各検出素子の構成を示す回路図、第４図は信号処
理回路の構成を示すブロツク図、第５図および第
６図は第４図の回路の動作を示すブロツク図であ
る。
Ｄ……回転円板、Da……切欠部、K1，K2，K3
……検出素子、A1，A2，A3……アンドゲート、
F1，F2，F3……フリツプフロツプ回路、M1，
M2，M3……単安定マルチバイブレータ回路、
OR……オアゲート、Ｃ……カウンタ。
Fig. 1 is a block diagram showing the overall configuration of an embodiment of the rotation speed detecting device of the present invention, Fig. 2 is a schematic diagram showing the arrangement of the detection elements with respect to the signal disk, and Fig. 3 is the configuration of each detection element. FIG. 4 is a block diagram showing the configuration of a signal processing circuit, and FIGS. 5 and 6 are block diagrams showing the operation of the circuit shown in FIG. 4. D... Rotating disk, Da... Notch, K 1 , K 2 , K 3
...detection element, A 1 , A 2 , A 3 ...and gate,
F 1 , F 2 , F 3 ... flip-flop circuit, M 1 ,
M 2 , M 3 ... monostable multivibrator circuit,
OR...Or gate, C...Counter.
Claims (1)
得るように互いに間隔をあけて配設され、前記被
検出部の通過の際に信号を発生する複数の検出素
子と、前記検出素子にそれぞれ対応して設けられ
たフリツプフロツプ回路と、前記フリツプフロツ
プ回路にそれぞれ対応して設けられ、対応するフ
リツプフロツプ回路がリセツト状態からセツト状
態に変化したときにパルスを発生するパルス発生
回路と、前記パルス発生回路の出力を入力とする
オアゲートと、前記オアゲートの出力を計数する
カウンタとを備え、前記フリツプフロツプ回路の
各々は、対応する検出素子が信号を発生し、かつ
対応する検出素子の、回転体の正転方向につき上
流側に位置する検出素子に対応するフリツプフロ
ツプ回路がセツト状態にあるときにセツトされ、
また対応する検出素子の、回転体の正転方向につ
き下流側に位置する検出素子に対応するフリツプ
フロツプ回路がセツト状態にあるときにリセツト
されるように接続されていることを特徴とする回
転数検出装置。1. A plurality of detection elements that are arranged at intervals from each other so as to face a detected part provided on the periphery of a rotating body and generate signals when passing the detected part, and a plurality of detection elements that generate signals when passing the detected part; flip-flop circuits provided correspondingly to each other; a pulse generating circuit provided correspondingly to the flip-flop circuits and generating a pulse when the corresponding flip-flop circuit changes from a reset state to a set state; and the pulse generating circuit. and a counter that counts the output of the OR gate, each of the flip-flop circuits has a corresponding detection element that generates a signal, and a corresponding detection element that detects normal rotation of the rotating body. is set when the flip-flop circuit corresponding to the sensing element located on the upstream side in the direction is in the set state;
Further, the rotation speed detection device is characterized in that the flip-flop circuit corresponding to the detection element located downstream of the corresponding detection element in the normal rotation direction of the rotating body is connected to be reset when the flip-flop circuit is in the set state. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3613582A JPS58153112A (en) | 1982-03-08 | 1982-03-08 | Device for measuring number of rotations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3613582A JPS58153112A (en) | 1982-03-08 | 1982-03-08 | Device for measuring number of rotations |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58153112A JPS58153112A (en) | 1983-09-12 |
| JPH0117527B2 true JPH0117527B2 (en) | 1989-03-30 |
Family
ID=12461339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3613582A Granted JPS58153112A (en) | 1982-03-08 | 1982-03-08 | Device for measuring number of rotations |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58153112A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2664973B1 (en) * | 1990-07-20 | 1992-10-23 | Schlumberger Ind Sa | DEVICE FOR DETECTING THE ROTATION OF A ROTATING ELEMENT SUCH AS THE TURBINE OF A WATER METER. |
| FR2750094B1 (en) * | 1996-06-25 | 1998-09-04 | Peugeot | CHILD SEAT DETECTION DEVICE, HOSE REEL COMPRISING SUCH A DEVICE AND DEVICE FOR INHIBITING AN INFLATABLE SAFETY BAG |
-
1982
- 1982-03-08 JP JP3613582A patent/JPS58153112A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58153112A (en) | 1983-09-12 |
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