| 摘要 |
A pressure sensitive switch has means for producing linear motion in response to pressure, means for springably resisting the linear motion, means for operating a switch after a predetermined linear motion, and a lifter pin having a projection on a first end for slidably engaging a hole in the means for springably resisting the linear motion, the lifter pin being mounted between the means for producing linear motion and the means for springably resisting the linear motion so as to transmit force from the means for producing linear motion to the means for springably resisting the linear motion, the lifter pin decoupling rotational motion between the means for producing linear motion and the means for springably resisting the linear motion. A piston may serve as the means for producing linear motion in response to pressure. The piston is mounted in a cylinder, and is supported on a first end by a fluorocarbon polymer ring and is supported on a second end by a fluorocarbon polymer slip ring which supports an elastomeric O ring, thereby minimizing friction between the piston and the cylinder. The piston has a substantially hemispherical hammer end for engaging the lifter pin without applying a moment to the lifter pin of any significant degree. The lifter pin engages a spring seat which in turn has an operating rod screwed into a threaded hole of the spring seat. The operating rod in turn engages a lever and induces rotational motion of the lever about an axle in order for the lever to operate the plunger of a switch. The switch may be either an electrical switch or an optical switch. The pressure transmitting parts comprising the piston, the lifter pin, the spring seat, and the operating rod are made of high strength materials in order to provide a rugged construction which can withstand pressure transients having a high rate of rise.
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