CA1127261A - Theft prevention apparatus for vehicles - Google Patents
Theft prevention apparatus for vehiclesInfo
- Publication number
- CA1127261A CA1127261A CA342,718A CA342718A CA1127261A CA 1127261 A CA1127261 A CA 1127261A CA 342718 A CA342718 A CA 342718A CA 1127261 A CA1127261 A CA 1127261A
- Authority
- CA
- Canada
- Prior art keywords
- pointer
- transmitter
- movement detector
- receiver
- electric potential
- 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
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
THEFT PREVENTION APPARATUS FOR VEHICLES
ABSTRACT OF THE DISCLOSURE
Theft prevention apparatus for vehicles which includes a movement detector provided with a pointer and generating an electric potential when the pointer is moved, a trans-mitter connected to the movement detector and a receiver provided with a loudspeaker and adapted to produce an alarm sound. The movement detector and the transmitter are mounted on a vehicle, and the receiver is detachably connected to the transmitter. When the receiver is detached from the connection with the transmitter, the transmitter transmits an alarm signal to the receiver in response to a predetermined amount of electric potential generated by movements of the pointer of the detector which is adapted to detect movements of the vehicle. When the receiver is connected to the transmitter, the pointer of the detector is locked against its movements, whereby proper and reliable operation of the detector can be assured.
ABSTRACT OF THE DISCLOSURE
Theft prevention apparatus for vehicles which includes a movement detector provided with a pointer and generating an electric potential when the pointer is moved, a trans-mitter connected to the movement detector and a receiver provided with a loudspeaker and adapted to produce an alarm sound. The movement detector and the transmitter are mounted on a vehicle, and the receiver is detachably connected to the transmitter. When the receiver is detached from the connection with the transmitter, the transmitter transmits an alarm signal to the receiver in response to a predetermined amount of electric potential generated by movements of the pointer of the detector which is adapted to detect movements of the vehicle. When the receiver is connected to the transmitter, the pointer of the detector is locked against its movements, whereby proper and reliable operation of the detector can be assured.
Claims (10)
1. A theft prevention apparatus for a vehicle, comprising:
a movement detector provided with a pointer;
said movement detector including means for generating an electric potential when said pointer is moved;
a transmitter including said movement detector;
a receiver provided with a loudspeaker and adapted for receiving an alarm signal from said transmitter;
said transmitter transmitting said alarm signal to said receiver in response to a predetermined amount of electric potential when said pointer of said movement detector is moved by a predetermined amount; and said pointer of said movement detector being capable of being biased to a fixed condition against movement of said pointer, by applying an electric potential to said movement detector.
a movement detector provided with a pointer;
said movement detector including means for generating an electric potential when said pointer is moved;
a transmitter including said movement detector;
a receiver provided with a loudspeaker and adapted for receiving an alarm signal from said transmitter;
said transmitter transmitting said alarm signal to said receiver in response to a predetermined amount of electric potential when said pointer of said movement detector is moved by a predetermined amount; and said pointer of said movement detector being capable of being biased to a fixed condition against movement of said pointer, by applying an electric potential to said movement detector.
2. An apparatus according to claim 1, wherein said movement detector is of the moving-coil type.
3. An apparatus according to claim 2, wherein said means for generating an electric potential includes a coil mounted on a base portion of said pointer of said movement detector, and magnet poles disposed on both sides, in the vertical direction, of said coil at a proper distance from said coil.
4. An apparatus according to claim 1, 2 or 3, wherein said pointer of said movement detector includes a spiral coil spring connected at one end to a shaft,about which said pointer is pivotally mounted, said pointer being provided at its distal end with a weight and being connected at the other end with the other end of said spiral spring so that said pointer is normally directed horizontally.
5. A theft prevention apparatus according to claim 1, wherein said transmitter is mounted on said vehicle; said receiver is detachably attached to said transmitter; said pointer is set movable with no electric potential supplied to said movement detector from a battery on said vehicle when said receiver is detached from said transmitter; and said pointer is set immovable with electric potential supplied to said movement detector by said vehicle battery when said receiver is attached to said transmitter.
6. An apparatus according to claim 1, wherein said loudspeaker is inseparably provided in said transmitter so that said transmitter can produce an alarm sound with no use of said receiver.
7. An apparatus according to claim 1, further including an adjustment device connected to said transmitter for varying the frequency or tone of a transmitting signal to prevent interference of alarm signals.
8. A theft prevention apparatus on a vehicle provided with a radio and a receiving antenna for said radio, said apparatus comprising:
a main section attached to said vehicle;
a receiver separated from said main section;
said main section including a movement detector provided with a pointer movable in response to vehicle movements for producing an electric potential, a transmitter connected to said movement detector, and a switch for connecting said receiving antenna to either one of said transmitter or said radio;
said transmitter transmitting an alarm signal via said antenna to said receiver in response to a predetermined amount of electric potential generated by movement of said pointer of said movement detector by a predetermined amount when said switch connects said transmitter to said antenna;
and, said movement detector being supplied with an electric potential to hold said pointer immovably when said switch connects said radio to said antenna.
a main section attached to said vehicle;
a receiver separated from said main section;
said main section including a movement detector provided with a pointer movable in response to vehicle movements for producing an electric potential, a transmitter connected to said movement detector, and a switch for connecting said receiving antenna to either one of said transmitter or said radio;
said transmitter transmitting an alarm signal via said antenna to said receiver in response to a predetermined amount of electric potential generated by movement of said pointer of said movement detector by a predetermined amount when said switch connects said transmitter to said antenna;
and, said movement detector being supplied with an electric potential to hold said pointer immovably when said switch connects said radio to said antenna.
9. An apparatus according to claim 8, wherein said movement detector is of the moving-coil type.
10. An apparatus according to claim 8, wherein said receiving is charged by being attached to said main section when said switch connects said radio to said antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA342,718A CA1127261A (en) | 1979-12-28 | 1979-12-28 | Theft prevention apparatus for vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA342,718A CA1127261A (en) | 1979-12-28 | 1979-12-28 | Theft prevention apparatus for vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1127261A true CA1127261A (en) | 1982-07-06 |
Family
ID=4115915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA342,718A Expired CA1127261A (en) | 1979-12-28 | 1979-12-28 | Theft prevention apparatus for vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1127261A (en) |
-
1979
- 1979-12-28 CA CA342,718A patent/CA1127261A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |