US3740648A - Distress call signalizer of the miniature transmitter type - Google Patents

Distress call signalizer of the miniature transmitter type Download PDF

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Publication number
US3740648A
US3740648A US00192835A US3740648DA US3740648A US 3740648 A US3740648 A US 3740648A US 00192835 A US00192835 A US 00192835A US 3740648D A US3740648D A US 3740648DA US 3740648 A US3740648 A US 3740648A
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United States
Prior art keywords
battery
coupled
transmitter
switch
circuit
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Expired - Lifetime
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US00192835A
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English (en)
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A Grotjahn
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Individual
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Individual
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/04—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons
    • G08B21/0438—Sensor means for detecting
    • G08B21/0446—Sensor means for detecting worn on the body to detect changes of posture, e.g. a fall, inclination, acceleration, gait
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0297—Robbery alarms, e.g. hold-up alarms, bag snatching alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions

Definitions

  • ABSTRACT A distress signal transmitter circuit comprising a position-sensitive mercury switch, and a pressure-sensitive mechanical switch, coupled in parallel to a transmitter and a power supply.
  • a continuously chargingdischarging capacitor coupled to the power supply and the transmitter, causes the generation and transmission of signals at predetermined intervals. Displacement of the mercury switch or pressure on the mechanical switch, interrupts the transmission of the signals at the predetermined intervals and causes a continuous signal to be transmitted by the circuit, thus indicating a distress condition.
  • the present invention relates to a distress signal transmitter circuit for attachment to a person or object for signalling a distress situation to a remote receiver.
  • An object of the invention is to provide an improved distress or emergency call signal transmitter which transmits a distress signal to a remote receiver tuned to the transmitter, producing in this way a distress signalling system always ready for use.
  • This object is achieved according to the invention by connecting a rhythmical pulse generator in parallel to a gravity responsive switch, and a pressure-sensitive mechanical switch. Displacement of the mercury switch, or the application of pressure on the mechanical switch, generates an alarm signal which is transmitted to the remote receiver.
  • the transmitter sends out a signal at regular intervals which, likewise, maintains the receiver in a state of readiness for operation.
  • the rhythm of these pulses is interrupted or interfered with by activation of the mercury or mechanical switches, the change in the,
  • the transmitted signal is detected by the receiver, which then generates a visual or audible alarm signal indicating a distress condition which can be observed on the receiver by the monitoring personnel and can be remedied or repaired at once.
  • the rhythmical pulse generator consists preferably of a capacitor which discharges at predetermined intervals thereby generating the pulse. If the pulsesare not sent out at the predetermined frequency to which e.g. a time-lag relay mounted on a receiver is tuned, then the technical alarm is given in the receiver. This occurs even when, in fact, the distress call signalizer is in order, yet its current sourceconsisting e.g. of button type dry batteries is exhausted or the voltage available is no longer sufficient.
  • Performance reliability of the distress call by connecting in parallel to its current source, a second power source via a second member dependent on said voltage.
  • This second power source is connected to the circuit of the distress call signalizer when the first current source no longer has sufficient voltage. In this way continuous performance reliability of the distress or emergency call signalizer is achieved even when the current source has become exhausted.
  • the emergency call signalling circuit comprises a housing (not shown) having the shape and size e.g. of a cigarette box with a battery 6 constituted, for instance, by button type cells, and a miniature transmitter which sends out a fixed frequency when connected to battery 6. This frequency is selectively received by a receiver (not shown) located in the vicinity and transferred via an integrating circuit to release the alarm.
  • a mercury toroid tube switch 7 is coupled in parallel to a pressure-sensitive mechanical switch 11 which is responsiveto pulling or pushing forces exerted on a pivotable cover mounted on the housing. Switches 7 and 11 are coupled to battery 6 and to transmitter 5.
  • Switch 11 includes two resilient external contacts 118 and 11C mounted on the outside of the housing which are connected to transmitter 5 by a changeover switch 10.
  • Switch 11 also includes a resilient center contact 1 1A which is connected to one of the terminals of battery 6 and miniature transmitter 5 there are, in addition to the mercury toroid tube switch 7, a change-over switch 11 parallel thereto which is responsive to pull or pressure exerted on a swivel hinged housing cover and comprises two resilient external contacts 11b and 11c alternatingly connectable via change-over switch 10 to the minature transmitter 5, as well as a resilient center contact 11a permanently connected to one pole of battery 6.
  • a central contact 7a directly connected to battery 6, as well as the contacts 7b and on the left and the right side and connected inparallel with each other. These later contacts are connected to the transmitter via cut-out or disconnector 2.
  • the filling of mercury 9 is, when the device is in the position of service, in the lower circumferential half portion of the toroid tube being of circular cross section. It closes its respective pairs of contacts 7a, 7b and and 7a, 70 of the mercury toroid tube swith 7 when swivelled to the left or the right.
  • a capacitor 14 is connected in parallel with the toriod tube switch 7 to in-' sure continuous operational readiness of the emergency call signalling circuit.
  • the capacitor 14 is proportioned so as to discharge at specified intervals, having the transmitter 5 transmit a signal which does not produce an alarm signal in the receiver. It is only when the pulse rhythm transmitted by the transmitter 5 is interrupted or disturbed that the receiver generates an alarm signal which notifies monitoring personnel that a distress situation exists.
  • the battery 16 become active when the voltage of battery 6 sinks below a predetermined limit value, thus making switching member 15 responsive.
  • Transmitter 5 is coupled to battery 6 by capacitor 14, whose capacitance is chosen so that its breakdown voltage is lower than the voltage of battery 6.
  • Switch 2 is closed in order to render the circuit responsive to switch 7.
  • Transmitter 5 generates a signal at a predetermined frequency which is interrupted intermittently at a specified rate by the discharging and charging of capacitor 14, thus resulting in the generation of a series of pulses, spaced apart at predetermined time intervals, which are transmitted to the remote receiver of the system.
  • mercury 9 in switch 7 bridges the gaps between contact members 7A and 7B or7C, thus or 7C, transmitter 5 directly to battery 6, bypassing capacitor 14, so that the transmitter emits a continuous signal at the specified frequency.
  • This change in the signal transmitted is detected by the receiver, which sets off an audible or visual alarm to attract the attention of monitoring personnel.
  • the receiver utilizes a conventional detector to detect the signals transmitted by the signalling circuit. When pressure is exerted on the housing adjacent switch 11, or the cover thereof is attempted to be opened, one of contacts 118 or 11C engages contact 11A and couples transmitter 5 directly to battery 6. The transmitter then generates a continuous single frequency signal as described previously. Switch enables the circuit to be set to respond to either pressure or pulling forces exerted on the cover of the housing.
  • the housing in which the signalling circuit is disposed is attached to an object or carried by a person.
  • the mercury switch sets off the alarm whenever the housing is displaced horizontally. If a pressure-sensitive activation is desired, the housing can be attached to the object so that the housing supports the weight thereof. When the object is moved, the mechanical switch activates the alarm signal at the remote receiver.
  • a distress call signalling circuit for transmitting a distress signal to a remote receiver which detects the distress signal and generates an alarm, comprising:
  • a transmitter having one of its terminals coupled to said battery, for .generating a signal at a specified frequency
  • a capacitor having a predetermined breakdown voltage,coupled at one end to said battery and at the other end to the other one of said transmitter terminals;
  • a mercury switch coupled in parallel to said capacitor, and having at least two contacts, one of said contacts being coupled to said transmitter and the other of said contacts being coupled to said battery;
  • a pressure-sensitive mechanical switch coupled in parallel to said capacitor, and including a stationary contact and a pair of movable pressuresensitive contacts diposed adjacent said stationary contact, said stationary contact being coupled to said battery, and said movable contacts being coupled to said transmitter.
  • circuit as recited in claim 1, further comprising a second battery, coupled in parallel to said first battery, and a switching member, coupled in series with said first and second batteries, and responsive to the voltage output of said first battery, for coupling said transmitter to said second battery when said voltage output of said first battery falls below a predetermined level.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Gerontology & Geriatric Medicine (AREA)
  • Transmitters (AREA)
  • Audible And Visible Signals (AREA)
  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)
US00192835A 1970-10-28 1971-10-27 Distress call signalizer of the miniature transmitter type Expired - Lifetime US3740648A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2052939A DE2052939C3 (de) 1970-10-28 1970-10-28 Als Kleinstsender ausgebildeter Notrufmelder

Publications (1)

Publication Number Publication Date
US3740648A true US3740648A (en) 1973-06-19

Family

ID=5786410

Family Applications (1)

Application Number Title Priority Date Filing Date
US00192835A Expired - Lifetime US3740648A (en) 1970-10-28 1971-10-27 Distress call signalizer of the miniature transmitter type

Country Status (3)

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US (1) US3740648A (enrdf_load_stackoverflow)
DE (1) DE2052939C3 (enrdf_load_stackoverflow)
FR (1) FR2111883B1 (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055839A (en) * 1975-07-25 1977-10-25 Locust Farms, Inc. Foaling alarm
US4296485A (en) * 1978-10-30 1981-10-20 Phillips Petroleum Company Tilt alarm in a seismic exploration system
US4667188A (en) * 1985-04-25 1987-05-19 Cable Electric Products, Inc. Portable alarm
US4719454A (en) * 1985-10-30 1988-01-12 Hopkins International Personal alarm
US4829285A (en) * 1987-06-11 1989-05-09 Marc I. Brand In-home emergency assist device
US4876532A (en) * 1988-06-23 1989-10-24 Fisher/Sauls Electronics, Inc. Vending rack burglar alarm
US5019803A (en) * 1987-12-02 1991-05-28 Morris Maram Detector units
US5157405A (en) * 1991-11-01 1992-10-20 Keith H. Wycoff Hunting arrow tracking system
US20100097207A1 (en) * 2008-10-16 2010-04-22 Stephen Mildenberger Activation device for personal alarm system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2314548A1 (fr) * 1975-06-09 1977-01-07 Seteca Appareil de signalisation individuel pour la detection rapide d'accident
DE2921470C2 (de) * 1979-05-26 1985-05-09 Alfred 3167 Burgdorf Grotjahn Tragbarer Notsignalgeber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176229A (en) * 1961-11-09 1965-03-30 Reginald R Pierce Radio rescue beacon
US3336530A (en) * 1964-10-14 1967-08-15 Trak Microwave Corp Direction finding system for hunting dogs
US3497808A (en) * 1966-03-28 1970-02-24 South Bay Associates Acceleration sensitive locating transmitter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176229A (en) * 1961-11-09 1965-03-30 Reginald R Pierce Radio rescue beacon
US3336530A (en) * 1964-10-14 1967-08-15 Trak Microwave Corp Direction finding system for hunting dogs
US3497808A (en) * 1966-03-28 1970-02-24 South Bay Associates Acceleration sensitive locating transmitter

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055839A (en) * 1975-07-25 1977-10-25 Locust Farms, Inc. Foaling alarm
US4296485A (en) * 1978-10-30 1981-10-20 Phillips Petroleum Company Tilt alarm in a seismic exploration system
US4667188A (en) * 1985-04-25 1987-05-19 Cable Electric Products, Inc. Portable alarm
US4719454A (en) * 1985-10-30 1988-01-12 Hopkins International Personal alarm
US4829285A (en) * 1987-06-11 1989-05-09 Marc I. Brand In-home emergency assist device
US5019803A (en) * 1987-12-02 1991-05-28 Morris Maram Detector units
US4876532A (en) * 1988-06-23 1989-10-24 Fisher/Sauls Electronics, Inc. Vending rack burglar alarm
US5157405A (en) * 1991-11-01 1992-10-20 Keith H. Wycoff Hunting arrow tracking system
US20100097207A1 (en) * 2008-10-16 2010-04-22 Stephen Mildenberger Activation device for personal alarm system

Also Published As

Publication number Publication date
DE2052939C3 (de) 1975-11-20
DE2052939B2 (enrdf_load_stackoverflow) 1975-04-03
FR2111883B1 (enrdf_load_stackoverflow) 1976-10-29
FR2111883A1 (enrdf_load_stackoverflow) 1972-06-09
DE2052939A1 (de) 1972-05-25

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