US4825696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acceleration detector
Assignee: Robert Bosch GmbH
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Filing: 1987-10-28
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Granted: 1989-05-02
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Expires: 2007-10-28
Abstract
Abstract An acceleration detector, the spring is a substrate plate, e.g., of Al 2 O 3 , which is fixed at one end in a housing. The resistors and the evaluating circuit are arranged on the spiral spring and can be applied to the substrate plate in a single work step using thick-film technology.
Inventors
- 👤 Dieter Seipler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:59
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
An acceleration detector for triggering passenger protection devices in motor vehicles, comprising a plate-like spring; means for fixing one end portion of said spring while leaving the opposite end portion free; means for retaining an intermediate portion of said spring to define a non-bending spring area between the intermediate and the fixed end portions, and a flexible spring area between the free end and the intermediate portions; a seismic mass secured to said free end portion to form therewith a flexural resonator; at least one expansion sensitive resistor arranged on said flexible spring area; and an active evaluation circuit arranged on said non-bending spring area and being connected to said at least one expansion sensitive resistor to evaluate its condition.
Claim 2
Dependent Claim
120 words
An acceleration detector for triggering passenger protection devices in motor vehicles, comprising a plate-like spring; means for fixing one end portion of said spring while leaving the opposite end portion free; means for retaining an intermediate portion of said spring to define a non-bending spring area between the intermediate and the fixed end portions, and a flexible spring area between the free end and the intermediate portions; a seismic mass secured to said free end portion to form therewith a flexural resonator; at least one expansion sensitive resistor arranged on said flexible spring area; and an active evaluation circuit arranged on said non-bending spring area and being connected to said at least one expansion sensitive resistor to evaluate its condition.
Claim 3
Dependent Claim
20 words
An accelerator detector as defined in claim 1 wherein said spring is a flexible substrate plate of a ceramic material.
Claim 4
Dependent Claim
18 words
An accelerator detector as defined in claim 2 wherein said flexible substrate plate is formed of aluminum oxide.
Claim 5
Dependent Claim
31 words
An accelerator detector as defined in claim 2 wherein said at least one expansion sensitive resistor and said evaluation circuit are applied on said flexible substrate plate by a thick-film technology.
Claim 6
Dependent Claim
22 words
An accelerator detector as defined in claim 1 wherein said one end portion of said spring is fixed in a plastic housing.
Claim 7
Dependent Claim
23 words
An accelerator detector as defined in claim 1 wherein said retaining means almost contact intermediate upper and lower regions of said plate-like spring.
References Cited (Backward Citations)
GB1000456A
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US4164263A
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US4311980A
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US4432247A
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US4430895A
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US4481497A
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US4699006A
Cited
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Cited
US4670092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |