| 摘要 |
<p>A delay switch working pneumatically comprises a piston and cylinder arrangement with the cylinder compartment being in communication with the outside air through a non-return valve and a throttle bore connected in parallel. The switch contacts comprise a contact spring connected to the piston and a portion of the inner cylinder wall which is made at least partially conducting. The piston is connected to an axially directed actuating pin through a first compression spring and is supported in the cylinder by a second compression spring which is weaker than the first compression spring. The cylinder may comprise a metallic sleeve which forms one switch connection and which has an insulating insert which the compact spring engages in the off state. In this arrangement, a second switch connection is electrically connected with the contact spring by means of the second compression spring.</p> |
