| 摘要 |
<p>A hinge assembly for pivotally mounting a @ dow particularly applicable to friction supporting stays in which the window pivots on the stays bodily outwards. The stay has a track 10 and a pivoted strut 16 which moves outwardly as the window opens. The track 10 carries one element 30 of a switch (e.g., a magnetic switch) and the strut 16 carries the other element 29. At one end of the fixed track 10 is mounted a burglar alarm or radio transmitter operable by the opening of the window which separates elements 29, 30.</p> |
