| 摘要 |
A partially concealed fast response sprinkler head having a body defining an inlet to be connected to a water line and having an outlet normally enclosed by a valve cap. The upper ends of a pair of lever members are supported on an internal shoulder in the body. Each lever member is generally semicircular in cross section and the lower ends of the lever members taper inwardly and define a central passage. The valve cap is provided with a threaded bore which receives a screw and the head of the screw engages a retaining bar, the ends of which bear against the upper ends of the respective lever members at a location spaced inwardly from the engagement of the lever members with the body, so that the force of the retaining bar against the lever members will tend to pivot the lower ends of the lever members outwardly away from each other. The retaining bar has a central opening that exposes the head of the screw and by turning out the screw from the threaded bore, a force will be applied to the lever members to urge the lever members outwardly away from each other. The lower ends of the lever members are retained together by a pair of metal heat transfer discs, which are disposed flatwise to each other and have mating open ended recesses that receive the lower ends of the lever members. A fusible metal is located at the interface between the discs. A decorative plate is removably attached to the body and the plate is urged by a spring against the ceiling. When the sprinkler head is exposed to an elevated temperature, the fusible metal will melt and the biasing action on the lever members will urge the lever members apart to release the lever members from engagement with the body and open the valve cap.
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