Thermoelectric pulse generator for motor vehicles |
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| 申请号 | US3707633D | 申请日 | 1972-03-01 | 公开(公告)号 | US3707633A | 公开(公告)日 | 1972-12-26 |
| 申请人 | BOSCH GMBH ROBERT; | 发明人 | URSEL ECKHARD; | ||||
| 摘要 | A pulse generator arrangement in which a heat-sensitive bimetallic snap disc is connected to a heating circuit when in its initial position. After being heated by current passing directly through the snap disc, the element moves to an actuated position in which a second circuit becomes closed. In the second circuit, the bimetallic snap disc becomes subjected to a lower heating current and thereby cools to a temperature required for the disc to snap back to its initial position. A motor and control circuit operating in conjunction with the snap disc serves for intermittent operation of windshield wipers in a motor vehicle. | ||||||
| 权利要求 | 1. A pulse generator, comprising, in combination, a heatsensitive movable element having a first position when in a substantially low-heated state and having a second position when in a relatively high-heated state; first circuit means connected to said heat-sensitive movable element and closed when said element is in said first position, the current in said first circuit means passing through said element when in said first position and heating said element; second circuit means closed when said element is in said second position, said element moving from said first position to said second position after predetermined heating by said first circuit means, said second circuit means heating said element in said second position with current having a smaller magnitude than the current of said first circuit means, said element cooling under the passage of said smaller current to a predetermined temperature for returning said element to said first position; and means for regulating the magnitude of the current in said second circuit means for regulating the pulse frequency of said pulse generator. 2. The pulse generator as defined in claim 1 wherein said regulating means comprises an adjustable resistor. 3. The pulse generator as defined in claim 1, wherein said first circuit means comprises electrical contact means closed when said element is in said first position, said contact means being opened when said element moves from said first position to said second position. 4. The pulse generator as defined in claim 1 wherein the current in said first circuit means passes directly through said element when in said first position for heating said element. 5. The pulse generator as defined in claim 4, wherein said first circuit means comprises contact means, the current in said first circuit means and passing through said element for heating said element also passing through said contact means. 6. The pulse generator as defined in claim 1, wherein said element comprises a bimetallic snap disc, said first circuit means including first contact means closed by said bimetallic snap disc when in said first position, said second circuit means including second contact means closed when said bimetallic snap disc is in said second position. 7. A pulse generator as defined in claim 5, including circuit load means connected in series with said element when In said first position. 8. The pulse generator as defined in claim 7, including resistor means connected in parallel with said circuit load means. 9. The pulse generator as defined in claim 8, including manually operated switching means connected to said first circuit means and said second circuit means for switching the pulse output signal of said pulse generator, said regulating means comprising variable resistor means connected in circuit with said switching means. 10. The pulse generator as defined in claim 1, including motor means; and control circuit means connected to said first circuit means and said second circuit means for controlling the operation of said motor in relation to the position of said element. |
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