GB1282038A - Safety limit switch operating without physical contact - Google Patents

Safety limit switch operating without physical contact

Info

Publication number
GB1282038A
GB1282038A GB48025/69A GB4802569A GB1282038A GB 1282038 A GB1282038 A GB 1282038A GB 48025/69 A GB48025/69 A GB 48025/69A GB 4802569 A GB4802569 A GB 4802569A GB 1282038 A GB1282038 A GB 1282038A
Authority
GB
United Kingdom
Prior art keywords
amplifier
actuated
switch
switching devices
timing
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
Application number
GB48025/69A
Inventor
Kurt Maecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB1282038A publication Critical patent/GB1282038A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
    • H03K17/9547—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator with variable amplitude
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9502—Measures for increasing reliability
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9505—Constructional details
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9517—Proximity switches using a magnetic detector using galvanomagnetic devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element

Landscapes

  • Auxiliary Devices For Machine Tools (AREA)
  • Electronic Switches (AREA)
  • Numerical Control (AREA)

Abstract

1282038 Limit switches K MAECKER 30 Sept 1969 [15 Nov 1968] 48025/69 Heading G1N A malfunction in a limit switch controlling, for example, the movement of a machine tool, is indicated by providing two switching devices 3À1, 3À2 which are both normally actuated by the proximity of the moving part to energize a relay, via an amplifier 6À1, the switching devices being connected to a further amplifier 13, via an arrangement of inverters 7, 9, AND members 8, 10, an OR member 11, and a timing member 12 so arranged that if the switching devices are not actuated within a pre-set (by timing device 12) time of each other, the further amplifier, 13 emits an alarm signal. As shown, the circuit is in the state when neither switching device is actuated. If one switch e.g. 3.1, is actuated, AND member 10 has input conditions L, L and thus passes a signal to the OR and timing members. If the second switch 3.2 is not actuated within the predetermined time to thus switch off member 10, then the amplifier 13 is energized to emit the alarm signal. A malfunction of the amplifier 6À1, e.g. due to a faulty supply source, may be indicated by connecting its output 0À1 to one input of a three-input AND member (14), the other two inputs of member (14) being obtained from the outputs of the inverters 7, 9, and the output of member (14) being connected to amplifier 13, Fig. 4 (not shown). The switching devices may be oscillators for use with moving metallic parts, or semi-conductor members having their resistance charged by a magnetic field, or a read switch for use with magnetic moving parts. The sensitive member of the switching device may be shielded so that only a part of a certain shape may enter the shield to actuate the switching device, Fig. 5, or 6-8 (not shown).
GB48025/69A 1968-11-15 1969-09-30 Safety limit switch operating without physical contact Expired GB1282038A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681809100 DE1809100B2 (en) 1968-11-15 1968-11-15 SAFETY LIMIT SWITCH FOR CONTACTLESS SWITCHING

Publications (1)

Publication Number Publication Date
GB1282038A true GB1282038A (en) 1972-07-19

Family

ID=5713420

Family Applications (1)

Application Number Title Priority Date Filing Date
GB48025/69A Expired GB1282038A (en) 1968-11-15 1969-09-30 Safety limit switch operating without physical contact

Country Status (4)

Country Link
US (1) US3636543A (en)
CH (1) CH532833A (en)
DE (1) DE1809100B2 (en)
GB (1) GB1282038A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2177216A (en) * 1985-07-05 1987-01-14 Baumer Electric Ag Proximity switch

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS569099A (en) * 1979-07-03 1981-01-29 Toyo Tokushu Kiki Kk Abnormality detecting method of automatic press
US4349814A (en) * 1979-10-08 1982-09-14 Duraplug Electricals Limited Electric switches
DE3220111C1 (en) * 1982-05-28 1983-06-09 Honeywell Gmbh, 6050 Offenbach Monitoring device for proximity switches
EP0522598A3 (en) * 1985-10-07 1993-03-10 Maschinenfabrik Rieter Ag Locating systems
ATE99264T1 (en) * 1988-08-23 1994-01-15 Inventio Ag METHOD AND DEVICE FOR GENERATION OF SHAFT INFORMATION WHEN ELEVATORS.
JPH0812994B2 (en) * 1988-09-22 1996-02-07 三菱自動車工業株式会社 Self-diagnosis type proximity switch
FI81700C (en) * 1988-12-22 1990-11-12 Kone Oy FOERFARANDE FOER ATT FORMA STYRSIGNALER I EN TRYCKKNAPPSTYRANORDNING SAMT EN TRYCKKNAPPSTYRANORDNING FOER TILLAEMPNING AV FOERFARANDET.
DE69033004T2 (en) * 1989-04-14 1999-11-18 Eja Engineering Plc, Wigan SAFETY SWITCH ARRANGEMENT
ES2124144B1 (en) * 1995-08-11 1999-08-16 Irausa Ing Sa ANTI-PINCH DEVICE.
US6114690A (en) * 1998-01-23 2000-09-05 Penn Engineering & Manufacturing Corp. Light-controlled safety switch for a punch press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2177216A (en) * 1985-07-05 1987-01-14 Baumer Electric Ag Proximity switch
GB2177216B (en) * 1985-07-05 1989-07-19 Baumer Electric Ag Proximity switch

Also Published As

Publication number Publication date
US3636543A (en) 1972-01-18
DE1809100B2 (en) 1971-09-02
DE1809100A1 (en) 1970-07-23
CH532833A (en) 1973-01-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees