US3569928A - Magnetically actuated safety alarm circuit - Google Patents

Magnetically actuated safety alarm circuit Download PDF

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Publication number
US3569928A
US3569928A US658452A US3569928DA US3569928A US 3569928 A US3569928 A US 3569928A US 658452 A US658452 A US 658452A US 3569928D A US3569928D A US 3569928DA US 3569928 A US3569928 A US 3569928A
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Prior art keywords
alarm
switch
contact
magnet
antitheft device
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Expired - Lifetime
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US658452A
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English (en)
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Alfonso Avallone
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Individual
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Individual
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1003—Alarm systems characterised by arm or disarm features

Definitions

  • the great advantage of such a device consists in the fact that although the codification is subjective, it may be massproduced, as it does not require constructional differences.
  • the above-mentioned magnetic code substantially consists in the principle that through magnetic impulses given by a magnet (or magnetic key) on the bulb contact a relay is gradually rotated. This relay has different positions and only one of them corresponds to the idle position of the device.
  • the above-mentioned device is complete because the alarm system sounding is performed by a simple opening of the bonnet or of a door or by the incorrect approach of a magnet.
  • the alarm may cause a current break in the engine and start the horn sounding, which sounding time may be regulated by a timing device.
  • FIG. 1 schematically illustrates a glass bulb contact in protective gas with a pole arrangement magnet and controlling magnet
  • FIG. 2 is an example of two glass bulb contacts with pole arrangement magnet and controlling magnet
  • FIG. 3 is an electrical circuit diagram of a car safety-lock device designed in accordance with the present invention.
  • FIG. 4 is a perspective view of a memory controlling magnet.
  • FIG. 1 a tube contact device or switch gear where the tube contains inert or protective gas is illustrated, and arranged magnets B having an adequate magnetic field intensity are provided in order to arrange or pole orient their polarity, but not suitable to close the contacts.
  • the contact occurs in the tube contact device A when another control magnet C approaches the device A as shown in FIG. 1, with its magnetic field complementary to the pole-orienting field created by magnet B, completing the field created by magnet B, while if it is approached by a magnet positioned as shown in D, i.e., opposite to the field of D, it does not close the contact.
  • the same result is obtained when the contact of device A approaches magnet C instead of the magnet C approaching contact device A.
  • two tube contact devices or switch gears E and F are arranged on the polarity of magnet C having an adequate intensity and unsuitable for the closing of the contacts.
  • contact device E closes, while contact device F opens.
  • contact device I opposite to magnet H, contact device F closes and contact device E opens.
  • Magnets B (FIG. 1) and G suitable to set the field are not sufficient to close the contacts, but they may have such a field intensity that approaching magnets C and H, close the contacts yet upon moving them away immediately, they may either keep the contacts closed (stable contact) or be unable to maintain its condition (unstable contact).
  • a DC electrical source 1 i.e., a car battery
  • An unstable tube magnetic field switch gear 2 is provided for the impulse counting control, and an unstable tube magnetic field switch gear 3 for the alarm control by an incorrect magnetic position.
  • Switch gears 2 and 3 are permanently influenced by a permanent magnet 4 having a suitable intensity and cooperatively arranged on a sheath 5 to be fitted in a suitable position on the car dashboard or cockpit, always adjacent to an external surface, in order to be able to use from the outside another control magnet shown in the two possible positions 6 and 6.
  • a coil is provided and a dashboard warning light 8.
  • An engine starting key switch is connected to the battery l.
  • Horns 10 or another acoustic, optical, or radiosignalling alarm system are electrically connected into the system.
  • a container houses devices for selecting the impulses and controlling the alarm comprising a catch relay or step-bystep switch 12 of a type havinga predetermined number of releases and controlling two switch gears.
  • a switch gear 13 which is arranged on a coil 7 feeds and a switch gear 14 controls a relay 15.
  • the relay 15 controls two other switches, switch 16 connected to the horns I0 and a switch 17 suitable to keep the relay under tension even when it cuts switch 14 out.
  • In the circuit of the switch gear 17 there is a bimetallic valve-timing contact 18 with a resistance suitable to cut current out in relay 15 and therefore disconnect alarm 10.
  • Different trip switches or switch gears 21 are arranged on the bonnet, baggage compartment, doors, etc.
  • the switches 21 may also constitute magnetic tube contact devices subject to magnetic fields which may cause the switch gear opening or closing under any change.
  • mobile and numbered notches 22 are provided on the back of magnet 6 to remind the car owner of the impulses given to the alarm device.
  • the alarm device of FIG. 3 operates in its idle position as follows.
  • the catch relay 12, provided with, for example, twelve notches, is connected only to the notch-closing switch gear 13 and the opening switch gear 14. Under these conditions relay 15 cannot be operated by current during the closing of the various switch gears 21 arranged on the doors and on the other parts to be safeguarded and therefore the alarm is idle, while the engine-starting key switch 9 and the coil 7 of the engine starting circuit is closed. 7
  • the device is in its alarm phase with the following operation.
  • the driver after checking the bonnet and the closing of the doors, approaches with magnet 6, as shown in the drawings, adjacent to switch gear 2 as many times as he believes necessary (for instance 5 times). Therefore, the switch gear 2 is closed five times and the catch relay 12 rotates by five releases. In this way relay 12 leaves its idle position and opens switch gear 13 and closes switch gear 14. Under these conditions the engine coil 7 feeding circuit is cut out and the alarm circuit feeding is arranged, i.e., placed in the operative, or ready to be activated condition. If a thief opens the bonnet or a door, i.e., he closes one of contacts 21, the coil of the relay 15 is under voltage and it closes switch gears 16 and 17.
  • Switch gear 16 closes the horn circuit which will then sound, while switch gear 17 keeps the coil of the relay 15 under voltage, even if the thief immediately open the switch gear 21.
  • the horns sound for a long or short period of time according to the bimetallic thermoregulator 18 adjustment, such that, after the elapsing of the time allowed, it cuts out the coil of the relay 15 from feeding, and consequently open switch gears 16 and 17.
  • the driver in order to open the door without actuating the alarm and in order to start the engine, must take the catch relay 12 back to its initial idle position and must approach with magnet 6 seven times in order to operate relay 12 by seven releases.
  • the relay 12 then opens switch gear 14 and closes the switch gear 13.
  • switch gear 3 arranged in sheath is a further device safety measure.
  • switch gear 3 closes the circuit and operates the alarm device similarly corresponding to switch gear 21.
  • Another feature of the safety device against unauthorized entry consists in the following.
  • the magnet 4 arranged in the sheath 5 has a magnetic field intensity inferior to the magnet 6 and therefore the latter influences the switch gear 2, even if it is spaced few centimeters distant, and it cannot be further approached, because if the field of the magnet 6 is superior, as to its intensity, to that of magnet 4 it closes switch gear 2 and also switch gear 3, activating the alarm.
  • the above-mentioned incidence occurs also when, instead of a usual magnet, a magnet with a much stronger magnetic field intensity is used.
  • the meter is arranged with numbers different from the notches of relay l2, and may help the car owner to remember the impulses given when setting the alarm device.
  • Another suitable memory system may be the system of providing the back of magnet 6 with several movable notches 22, as many as the number of notches on relay 12, as shown in FIG. 4.
  • the above-described device may have particular shapes and may be applied to cars and to any other object as well where there is an order to be respected.
  • the pictures in a gallery may be provided with switch gears 21 closing complementary alarm circuit if they are taken away or only moved. Consequently, switch gears 21 may be arranged on statues, windows and door frames, tents, floors, bunches of banknotes etc., sounding the alarm if they are removed from their usual position.
  • a vehicle antitheft device comprising:
  • a contact making step-by-step switch including at least one The tube contact and operatively connected to said alarm and having a plurality of positions, only one of which cuts off said alarm;
  • said alarm and said step-by-step switch being mounted on a vehicle
  • the alarm condition being set by stepping said switch from an alarm cutoff position by a variable first number of steps, and reset by stepping said switch by a second number of steps, the sum of the two numbers being equal to the number of positions of said step-by-step switch.
  • the vehicle antitheft device as set forth in claim 1, further comprising a thermally actuated contact means in series with said at least one contact and said alarm for actuating said alarm for a predetermined period when said at least one alarm-initiating contact is actuated when said switch is set in a noncutoff alarm position.
  • the vehicle antitheft device further comprising:
  • said at least one alarm-initiating contact being operatively mounted on doors, windows and bonnet of said motor vehicle;
  • said contact means comprises a first reed switch and adapted to be positioned for ready access by a person to be opened and closed by said magnetic means; and container means for mounting the remainder of said device.
  • the vehicle antitheft device as set forth in claim 4, further comprising a second reed switch means mounted adjacent said first reed switch and connected in series with said at least one contact and adapted to be actuated by a magnet stronger than said magnetic means for actuating said alarm when said step-by-step switch is set in a noncutoff alarm positron.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)
  • Burglar Alarm Systems (AREA)
US658452A 1967-05-31 1967-08-04 Magnetically actuated safety alarm circuit Expired - Lifetime US3569928A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT704167 1967-05-31

Publications (1)

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US3569928A true US3569928A (en) 1971-03-09

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Application Number Title Priority Date Filing Date
US658452A Expired - Lifetime US3569928A (en) 1967-05-31 1967-08-04 Magnetically actuated safety alarm circuit

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US (1) US3569928A (it)
CH (1) CH497008A (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813663A (en) * 1972-11-10 1974-05-28 D Perkins Electrical locking alarm system
US3968483A (en) * 1975-01-08 1976-07-06 Leonard Jolley Burglar and fire alarm system
US3975723A (en) * 1975-05-14 1976-08-17 Overhead Door Alert Company, Inc. Door alert system and magnetic switch therefor
US4206439A (en) * 1978-01-05 1980-06-03 Steinitz Donald J Alerting system and arming/disarming apparatus therefor
US4473815A (en) * 1981-11-12 1984-09-25 Miller Sr Richard C Battery control and alarm system for vehicles
US6623326B2 (en) 2001-12-19 2003-09-23 Hasbro, Inc. Sound-effects generating device with bipolar magnetic switching for activity devices

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0535632A3 (en) * 1991-10-01 1993-05-19 Japan Magnetic Lock Co., Ltd. Burglarproof system for automotive vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1803292A (en) * 1927-11-21 1931-04-28 Adler Safety Control Company Automatic signal for automobiles
US3341813A (en) * 1964-05-25 1967-09-12 Security Controls Inc Magnetic sensor device
US3349323A (en) * 1964-08-19 1967-10-24 Robert D Mullen Apparatus and methods employing magnetic reed switches and static and varying bias fields for detecting magnetic phenomena

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1803292A (en) * 1927-11-21 1931-04-28 Adler Safety Control Company Automatic signal for automobiles
US3341813A (en) * 1964-05-25 1967-09-12 Security Controls Inc Magnetic sensor device
US3349323A (en) * 1964-08-19 1967-10-24 Robert D Mullen Apparatus and methods employing magnetic reed switches and static and varying bias fields for detecting magnetic phenomena

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813663A (en) * 1972-11-10 1974-05-28 D Perkins Electrical locking alarm system
US3968483A (en) * 1975-01-08 1976-07-06 Leonard Jolley Burglar and fire alarm system
US3975723A (en) * 1975-05-14 1976-08-17 Overhead Door Alert Company, Inc. Door alert system and magnetic switch therefor
US4206439A (en) * 1978-01-05 1980-06-03 Steinitz Donald J Alerting system and arming/disarming apparatus therefor
US4473815A (en) * 1981-11-12 1984-09-25 Miller Sr Richard C Battery control and alarm system for vehicles
US6623326B2 (en) 2001-12-19 2003-09-23 Hasbro, Inc. Sound-effects generating device with bipolar magnetic switching for activity devices

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CH497008A (it) 1970-09-30

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