| 摘要 |
PURPOSE:To obtain the quake sensitive automatic blocking type gas tap with simple structure by a structure wherein the blocking of the gas tap is performed by th rotation of a core started by the disengagement of the locking of a spring energized in advance, the locking of which is also disengaged by the disengagement of the locking of a weight through the rotation of a core when the weight detects the quake having the magnitude larger than a fixed value. CONSTITUTION:The core as a whole is attracted downward so as to adhere the weight 8 to a magnet 9 by pulling a core shaft 5 downward, while winding up the spring 2 by pulling motion of the core shaft 5 and to engage a lower brake plate 3 with a pawl (not shown). The weight 8 rolls by earthquake and, when the earthquake has a magnitude larger than the predetermined seismic intensity, for example the intensity of 5, the weight 8 rolls off the magnet 9. As a result, the core containing the core shaft 5 is moved upward by the energized force of a spring (not shown), resulting in disengaging the locking of the lower brake plate 3 and consequently rotating the core by means of the spring 2. The rotation of the core is followed by the rotation of an upper coupling plate 1, which pivots the gas tap to close through an adaptor (not shown) connected by vanes 7. In such a manner as described above, the gas tap can be automatically closed by detecting earthquake with the simple structure. |
