| 摘要 |
<p>An electrical pressure sensing switch for a pressure cooker comprises a plunger slidably and sealingly mounted in a lid 21 of a cooking vessel 20. The plunger 24 is moved towards one end of a pivoted lever 33 when pressure rises inside the vessel 20. The other end of the lever is positioned to press down against an operating arm 26. When the force applied by the plunger as a result of higher pressures in the vessel 20 is sufficient to overcome bias of a spring 28, the arm 26 is moved down by the lever. This results in operation of micro-switches 31 and 32. Embodiments of the invention are mechanically simple and accommodate wide tolerances without loss of calibration, while necessary electrical parts are separated or separable from the lid 21 to facilitate cleaning and washing. <IMAGE></p> |
