| 摘要 |
The short-stroke push-button switch described here has an elastic push-button element, in a manner known per se, which is in the form of a disc, can be pressed in in a sprung manner against a mating contact device as a contact device, and at the same time connects the poles of a circuit to one another. The novel feature is that the push-button element (1) is produced integrally with the push-button housing (2). Access to the hermetically sealed air space (26, 27) between the push-button element and the mating push-button device (13) is thus possible only by exercising sufficient force for breakage. Another novel feature is that the air pressure in the air space (opposing pressure against the switching pressure) remains virtually constant over the temperature range -30@C to +80@C as a result of a special pressure equalizing device (22, 24). The excellent progress on the short-stroke push-button switch according to the invention is, however, the reliability of switching even when the switch is pressed off-centre. Even a slight switching pressure on the edge of the push-button element (1) results in reliable switching. The reliability is based on the novel multi-point circuit which is contained in a contact support (13) and whose eight switching points (14, 15) are arranged in a circular shape around the vertical axis of the flexibly elastic contact disc (7) which is mounted on the push-button element (1), at a distance from it. The switching movement (distance between the contact disc and the switching points) can be adjusted by displacing the cylindrical contact support along the vertical axis in a moulded ring (11) which is mounted in the push-button housing. <IMAGE>
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