US3629818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antitheft device for a motor vehicle
Assignee: Nissan Motor Co Ltd
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Filing: 1969-10-29
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Granted: 1971-12-21
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Expires: 1989-10-29
Abstract
Abstract An antitheft device for a motor vehicle, which device is a combination of steering shaft locking means and two switches operated by the motion of the locking means. One of the switches is closed only when the door is opened and the other when the steering shaft is not ready to be locked so that the alarming means, which may actually be an alarming light or buzzer, becomes operative if and only if the door is opened when the locking means is held in the unlocking positions.
Inventors
- 👤 Teruo Hirama
- 👤 Yukio Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:34
CPC Classifications
B; B60; B60R; B60R25/00; B60R25/01; B60R25/02; B60R25/021; B60R25/0211; B60R25/02115; B60R25/02126; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5889; Y10T70/5956
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
In a vehicle having an engine ignition switch, a steering shaft, and at least one door for entry into the vehicle and exit thereof, a theft-prevention device comprising, a key-operated unit mounted on said steering shaft or receiving a key for locking and unlocking said steering shaft and including a generally cylindrical hollow housing, a locking member slidably received in said housing, a sliding member connected with said locking member adjacent an end thereof for actuating said locking member to lock the steering shaft when said key is inserted in said unit and actuated to a selected position, an alarm switch mounted on said cylindrical housing operable to an opened and closed position by said sliding member, said switch being in a closed position when said steering shaft is in an unlocked condition, a door switch circuit completed when said door is opened, a door switch in said circuit operable by said door to close said circuit each time when said door is opened, an alarm means and a power source in series with said alarm switch and said door switch to produce alarm signals whenever said door is opened without said steering shaft being locked, and a relay switch in series with said alarm means having an operating coil connected to said ignition switch energized upon closing of said ignition switch, and opening said relay switch when energized upon closing of said ignition switch thereby rendering the alarm means ineffective.
Claim 2
Dependent Claim
241 words
In a vehicle having an engine ignition switch, a steering shaft, and at least one door for entry into the vehicle and exit thereof, a theft-prevention device comprising, a key-operated unit mounted on said steering shaft or receiving a key for locking and unlocking said steering shaft and including a generally cylindrical hollow housing, a locking member slidably received in said housing, a sliding member connected with said locking member adjacent an end thereof for actuating said locking member to lock the steering shaft when said key is inserted in said unit and actuated to a selected position, an alarm switch mounted on said cylindrical housing operable to an opened and closed position by said sliding member, said switch being in a closed position when said steering shaft is in an unlocked condition, a door switch circuit completed when said door is opened, a door switch in said circuit operable by said door to close said circuit each time when said door is opened, an alarm means and a power source in series with said alarm switch and said door switch to produce alarm signals whenever said door is opened without said steering shaft being locked, and a relay switch in series with said alarm means having an operating coil connected to said ignition switch energized upon closing of said ignition switch, and opening said relay switch when energized upon closing of said ignition switch thereby rendering the alarm means ineffective.
Claim 3
Dependent Claim
111 words
The theft-preventing device as claimed in claim 1, wherein said alarm switch comprises a stationary contact connected to said door switch, a movable contact connected to said alarm means and normally disengaged from said stationary contact, a plunger mechanically connected to said movable contact, and a leaf spring normally spaced from said plunger, said leaf spring being pressed by said sliding member when said sliding member is held in position remote from the steering shaft to hold said moving contact in contact with said stationary contact and released from said sliding member as the sliding member draws nearer to the steering shaft to disengage said movable contact from said stationary contact.
Claim 4
Dependent Claim
100 words
The theft-preventing device as claimed in claim 1, wherein said door switch comprises, a housing defining a stationary contact, a plunger mounted in the last-mentioned housing and retracted in the housing when depressed by the wall of the door, and a movable contact mechanically connected with said plunger and isolated from said last-mentioned housing when said plunger is in its retracted position, and a spring causing said plunger to protrude from said housing as the door is opened to cause said movable contact to contact said last-mentioned housing, whereby the door switch is closed only when the door is opened.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |