Positive or negative acceleration operated conductive liquid switch for vehicle safety devices |
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| 申请号 | US32916873 | 申请日 | 1973-02-02 | 公开(公告)号 | US3869588A | 公开(公告)日 | 1975-03-04 |
| 申请人 | SAID UBUKATA BY SAID MIZUTANI; | 发明人 | UBUKATA SUSUMU; MIZUTANI YASUKAZU; | ||||
| 摘要 | This conductive liquid switch is a novel mercury switch to be mounted on a horizontally moving apparatus such as an automobile and clearly distinguishes the condition of acceleration caused during the abnormal motion period in which the automobile is subjected to sudden acceleration or deceleration or skidding which is dangerous for the automobile from the conditions of acceleration caused during the period in which the automobile is parking, or is subjected to the usual acceleration or deceleration, or is travelling at a normal speed, thereby to open or close at least one electric circuit. This switch is activated when a predetermined value of acceleration is applied thereto in one direction for a predetermined period of time before the moving apparatus is tilted at a dangerous angle or turned upside down owing to a collision or the like, that is, the position of the moving apparatus is not different from the usual position thereof, thereby to operate an occupant''s protection device such as a safety belt, an air bag, or a safety net. | ||||||
| 权利要求 | 1. A positive or negative acceleration operated conductive liquid switch for a horizontally moving apparatus which comprises: at least one sealed container which is to be mounted on the horizontally moving apparatus and has electrically conductive contact means to selectively open and close at least one electrical circuit to provide respectively first and second operating modes thereof; and electrically conductive fluid contained in the sealed container and adapted to electrically communicate with the electrically conductive contact means, the electrically conductive contact means and the electrically conductive fluid being arranged so that the electrically conductive contact means operaTes to selectively connect the electrical circuit in the first of said operating modes upon only gravity being applied to the electrically conductive fluid, but, when acceleration in a horizontal direction and the gravity are simultaneously applied to the electrically conductive fluid, the electrically conductive fluid is deformed to cause the electrically conductive contact means to connect the electrical circuit in the second of said operating modes both in the case where a first acceleration in a horizontal direction exceeding a first threshold value which is relatively low is applied in one direction for a first duration period which is relatively long and in the case where a second acceleration in a horizontal direction exceeding a second threshold value which is relatively high is applied in one direction for a second duration period which is relatively short. 2. A positive or negative acceleration operated conductive liquid switch for a horizontally moving apparatus as claimed in claim 1, which comprises first and second sealed containers each of which has at least one pair of electrically conductive contacts and is to be mounted on the horizontally moving apparatus, the electrically conductive contacts in the first and second sealed containers being connected in parallel to each other; and first and second electrically conductive fluids contained respectively in the first and second sealed containers, the first and second electrically conductive fluids causing the respective electrically conductive contacts to be electrically disconnected for a period during which only gravity is applied to the first and second electrically conductive fluids, the first electrically conductive fluid causing the electrically conductive contacts of the first sealed container to be electrically connected when the first acceleration and the gravity are simultaneously applied to the first electrically conductive fluid for the first duration period, and the second electrically conductive fluid causing the electrically conductive contacts of the second sealed container to be electrically connected when the second acceleration and the gravity are simultaneously applied to the second electrically conductive fluid for the second duration period. 3. A positive or negative acceleration operated conductive liquid switch as claimed in claim 1, which comprises first and second sealed containers each of which has at least one pair of electrically conductive contacts and is to be mounted on the horizontally moving apparatus, the electrically conductive contacts being connected in series to each other; and first and second electrically conductive fluids contained respectively in the first and second sealed containers, the first and second electrically conductive fluids causing the respective electrically conductive contacts to be electrically connected for a period during which only gravity is applied to the first and second electrically conductive fluids, the first electrically conductive fluid causing the electrically conductive contacts of the first sealed container to be electrically disconnected when the first acceleration and the gravity are simultaneously applied to the first electrically conductive fluid for the first duration period, and the second electrically conductive fluid causing the electrically conductive contacts of the second sealed container to be electrically disconnected when the second acceleration and the gravity are simultaneously applied to the second electrically conductive fluid for the second duration period. 4. A positive and negative acceleration operated conductive liquid switch as claimed in claim 1, which comprises: a container including a cone-shaped bottom part and a cylindrical part extending from the cone-shaped bottom part; and electrical insulating lid inserted in the container along the inside of the bottom part so as to form a sealed room; a proper quantity of electrically conductive fluid enclosed in the electrically conductive fluid enclosed iN the sealed room; a first electrode connected to the lower end of a conductor penetrating through a protruded portion extending downwards from the center of the lid; a ring-shaped second electrode with a surface confronting the cone-shaped bottom part substantially at a constant distance; and a spatial part formed around the protruded portion and in succession with the sealed room, the electrically conductive fluid being maintained in contact with the first electrode and the second electrode thereby forming an electrical circuit for a period during which only gravity is applied to the electrically conductive fluid, moving outwards along the cone-shaped bottom part when the first acceleration and the gravity are simultaneously applied to the electrically conductive fluid for the first duration period, and allowing a part of the electrically conductive fluid to move into the upper part of the spacial part to open the electrical circuit when the second acceleration and the gravity are simultaneously applied to the electrically conductive fluid for the second duration period. 5. A positive and negative acceleration operated conductive liquid switch as claimed in claim 2, which comprises a control member provided at a passage, into which the electrically conductive fluid is moved upon application of acceleration, so as to control movement of the electrically conductive fluid, thereby to obtain desired responsive conditions of the switch. 6. A positive and negative acceleration operated conductive liquid switch as claimed in claim 3, which comprises a control member provided at a passage, into which the electrically conductive fluid is moved upon application of acceleration, so as to control movement of the electrically conductive fluid, thereby to obtain desired responsive conditions of the switch. 7. A positive and negative acceleration operated conductive liquid switch as claimed in claim 5, in which at least a pair of electrically conductive contacts and the control members for controlling the movement of the electrically conductive fluid are coaxially arranged in a horizontal plane. 8. A positive and negative acceleration operated conductive liquid switch for a horizontally moving apparatus which comprises: a sealed container which has at least one pair of electrically conductive contacts and is to be mounted on the horizontally moving apparatus; and an electrically conductive fluid contained in the sealed container and adapted to electrically communicate with the electrically conductive contacts, the sealed container having a part adapted to be deformed to adjust sensitivity of the switch with respect to acceleration applied thereto in a horizontal direction, said deformable part of said sealed container being a cylindrical part, the cross-section of the cylindrical part being deformed, for instance, from an ellipse to a circle or vice versa to increase or decrease the volume of an interior space in the sealed container where the electrically conductive fluid is contained and accordingly to raise or lower the upper surface of the electrically conductive fluid, whereby the switch is adjusted to respond to a predetermined acceleration which is applied to the switch in a horizontal direction. |
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