| 摘要 |
<p>Improvemente in the pressure-gauges for fire-extinguishers and the like, more particularly in the pressure-gauges of the axial movement type, comprising a calibrated coil spring (B) and a sensitive plunger (A) submitted to the pressure existing in the container, said improvements comprising the provision of a thin rod or stem (7) axially arranged through the pressure-gauge to engage said plunger and including a pushbutton (6) on the outer end thereof, and the provision of an indicating pointer (3) having a gooseneck formation permitting said pointer to move past the center of the pressure-gauge without interferring with said rod, the arrangement being such that, when a check of efficiency is desired, said pushbutton of the thin rod is just to be depressed, whereby said calibrated spring is temporarily put out of service, thus permitting the pointer of the gauge to move back to the zero position; thereafter, when the depressing action against the pushbutton is discontinued, said pointer should resume the original position.</p> |
