Patent US3898400A successfully refreshed from Google Patents.
US3898400A
Expired / Lapsed
US
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Pendulum type inertia switch
Assignee: Takata Kogyo Co Ltd
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Filing: 1973-11-23
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Granted: 1975-08-05
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Expires: 1993-11-23
Abstract
Abstract A compact pendulum type acceleration and inclination responsive switch includes a vertical cylindrical housing having a medial horizontal partition with a central opening and an upwardly directed short cylindrical wall surrounding the opening and terminating in a beveled top edge. A pendulum is concentric with the partition opening and terminates at its top in a cap member resting in the cylindrical wall with its skirt wall surrounding and spaced from the cylindrical wall, the cap being provided with an upwardly directed central actuating projection. A double throw micro-switch is mounted on the housing top wall and includes a spring switch arm registering with the actuating projection, so that the pivotal movement of the pendulum cap about the cylindrical wall as a multiple fulcrum attendent to a predetermined acceleration or inclination actuates the switch arm.
Inventors
- 👤 Takezo Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:05
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
In the electrical control of the locking of a safety belt take-up reel against belt withdrawal, an inertia switch device comprising a support structure, an upwardly directed circular fulcrum wall mounted to said support structure and delineating a circular opening, the upper edge of said circular wall being beveled, a pendulum member including a circular section resting on said upper edge of said circular wall and a depending section extending coaxially from said circular section through said opening, and a switch mounted on said support structure and including an actuating member movable from a deactuated to an actuated position in response to the pivotal movement of said pendulum member including said circular section about said top edge of said circular wall, the locking of said reel responding to the actuation of said switch.
Claim 2
Dependent Claim
133 words
In the electrical control of the locking of a safety belt take-up reel against belt withdrawal, an inertia switch device comprising a support structure, an upwardly directed circular fulcrum wall mounted to said support structure and delineating a circular opening, the upper edge of said circular wall being beveled, a pendulum member including a circular section resting on said upper edge of said circular wall and a depending section extending coaxially from said circular section through said opening, and a switch mounted on said support structure and including an actuating member movable from a deactuated to an actuated position in response to the pivotal movement of said pendulum member including said circular section about said top edge of said circular wall, the locking of said reel responding to the actuation of said switch.
Claim 3
Dependent Claim
32 words
The inertia switch device of claim 1 wherein said pendulum circular section comprises a peripheral skirt wall depending from said support member and coaxially surrounding and radially spaced from said circular wall.
Claim 4
Dependent Claim
71 words
The inertia switch device of claim 1 wherein said support structure includes a housing and comprising a horizontal partition located in said housing between the top and bottom thereof, and having formed therewith said central circular opening and upwardly directed circular wall, said switch being mounted to said housing above said partition and an actuating element mounted atop said pendulum and swingable therewith into actuating engagement with said switch actuating member.
Claim 5
Dependent Claim
62 words
The inertia switch device of claim 3 wherein said switch comprises first and second stationary contact elements and a resilient switch arm normally engaging one of said first contact elements and transferrable into engagement with said second contact element, said arm and contact elements being insulated from each other and said actuating element being movable into actuatable engagement with said switch arm.
Claim 6
Dependent Claim
25 words
The inertia switch device of claim 1 including a skirt wall depending from said circular section and surrounding the upper border of said circular wall.
Claim 7
Dependent Claim
35 words
The inertia switch device of claim 5 wherein said circular wall flares upwardly and outwardly and terminates in said beveled edge which engages the peripheral inside corner between said circular section and said skirt wall.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |