| 摘要 |
<p>An improved concealed sprinkler head for an automatic sprinkler system. The sprinkler head includes an orifice body that is mounted above the ceiling of the building and is connected to the water line. The body has an outlet which is normally closed by a valve cap, and the cap is held in the closed position by a lever assembly which includes a lever and a leaf spring. The lever has a pair of parallel spaced arms and a tube, which houses a fusible metallic element, extends between the arms. Balls are located within the ends of the tube on either side of the fusible element and impressed into the ends of the element, and the balls are engaged with sockets in the arms. One end of the lever is engaged with an abutment on the valve body and the opposite end of the lever is engaged with the leaf spring which is fulcrummed on the abutment. The leaf spring bears against the tube and urges the tube in a downward direction. A decorative plate is positioned against the ceiling and is connected by a fusible material to a cup-shaped plastic sleeve that is slidable on the body. When the decorative plate is exposed to an elevated temperature, the fusible material will melt enabling the decorative plate to be released, and subsequently the fusible element associated with the lever assembly will melt to release the lever assembly and open the valve cap.</p> |
