US3748415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acceleration responsive switch with magnetic actuator means
Assignee: Tokai Rika Co Ltd
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Filing: 1971-11-26
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Granted: 1973-07-24
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Expires: 1991-11-26
Abstract
Abstract An acceleration responsive switching device which comprises a substantially generally cylindrical casing having formed a limited space over its upper peripheral surface and a substantially vertical bore with its one end open extending at a slight distance from a central portion of the limited space, acceleration sensing means accommodated in the limited space, a switch actuating means accommodated in the vertical bore and a switch element provided downwardly of the open end of the vertical bore. The acceleration sensing and switch actuating means are composed of a permanent magnet and a magnet substance, respectively, and vice versa. With this arrangement, the acceleration responsive switching device is actuated by an acceleration exceeding a predetermined level encountered in such moving vehicle as an automobile.
Inventors
- 👤 M Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:31
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/14; H01H35/141; G; G01; G01C; G01C9/00; G01C9/02; G01C9/06; H01H36/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
An acceleration responsive switching device, comprising in combination: a casing having a limited space over the upper peripheral surface thereof, and a substantially vertical bore extending from a central portion of said limited space and separated therefrom by a partition, said bore having an open lower end; an acceleration sensing means normally located in the central portion of said limited space and laterally displaceable therefrom in response to a predetermined magnitude of acceleration of said device; a switch actuating means freely movable in said bore and normally held at said partition by magnetic attraction between said acceleration sensing means and switch actuating means, one of said acceleration sensing means and switch actuating means comprising a permanent magnet and the other comprising a magnetically attractable member; a switch element adjacent the open lower end of said bore and actuable by downward movement of said switch actuating means theretoward resulting from said lateral displacement of said acceleration responsive means from said central portion.
Claim 2
Dependent Claim
161 words
An acceleration responsive switching device, comprising in combination: a casing having a limited space over the upper peripheral surface thereof, and a substantially vertical bore extending from a central portion of said limited space and separated therefrom by a partition, said bore having an open lower end; an acceleration sensing means normally located in the central portion of said limited space and laterally displaceable therefrom in response to a predetermined magnitude of acceleration of said device; a switch actuating means freely movable in said bore and normally held at said partition by magnetic attraction between said acceleration sensing means and switch actuating means, one of said acceleration sensing means and switch actuating means comprising a permanent magnet and the other comprising a magnetically attractable member; a switch element adjacent the open lower end of said bore and actuable by downward movement of said switch actuating means theretoward resulting from said lateral displacement of said acceleration responsive means from said central portion.
Claim 3
Dependent Claim
89 words
An acceleration responsive switching device according to claim 1, wherein said acceleration sensing means is a steel weight ball and said switch actuating means is a permanent magnet having magnet poles at the upper and lower ends thereof, said limited space accommodating said weight ball comprises a chamber formed by a reverse conical upper end wall of said casing and a cap member, said cap member being configurated in a conical shape corresponding to said reverse conical upper end wall of said casing and being fitted to said casing.
Claim 4
Dependent Claim
146 words
An acceleration responsive switching device according to claim 1, wherein said acceleration sensing means is a permanent magnet having magnet poles at upper and lower ends thereof and said switch actuating means is a steel weight ball, said casing having a concave upper end wall, and further comprising a closure member fitted to the upper end of said casing and defining said limited space as a relatively deep cavity in combination with said concave upper end wall of said casing, a cap member securing said closure member to said casing, said closure member having a further bore formed centrally of its upper peripheral surface and defining a ball bearing surface, a rotatable spherical member seated on said ball bearing surface and a non-magnetic rod having one end fitted to said spherical member and the other end holding said permanent magnet and extending midway into said cavity.
Claim 5
Dependent Claim
30 words
An acceleration responsive switching device according to claim 1, wherein said switching element is a microswitch having a push button normally held in an extended conditin through a spring force.
Claim 6
Dependent Claim
96 words
An acceleration responsive switching device according to claim 1, in which said casing is substantially cylindrical and has a concave upper surface, means including a cap threaded to said casing and spaced above said upper surface to define said limited space, said bore being aligned between said central portion and said switch element, said switch actuating means being longitudinally slidabLy disposed in said bore, whereby said magnetic attraction between said acceleration sensing means and switch actuating means tends to hold the acceleration sensing means at said central portion in the normal unaccelerated condition of said device.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |