| 摘要 |
Method and apparatus are disclosed for producing pin operators for pressure switches in which the pin operator is adjusted in length while in a pressure environment with an associated diaphragm when subjected to proof pressure for the finished switch assembly. The pressure housing is preferably the actual switch housing. A die with a recess is aligned with the diaphragm and pin. The pin blank has an opening and tapered wall thickness. When proof pressure is applied to the opposite face of the diaphragm, the diaphragm forces the pin into the die recess to form the end of the pin and shorten its length. Thereafter the pin and diaphragm combination in the pressure housing will provide a prescribed travel when the diaphragm is subjected to proof pressure. An alternative device is disclosed for forming the ends of pins where proof pressure for the particular device is less than the required forming pressure for the pin. Semi-cylindrical, truncated conical and outwardly flared pin forms are disclosed. The alternate embodiment apparatus includes a body including an adjustable screw at one side and a dial indicator at the opposite side. A die is movable by the screw to deform a hollow end pin located in a pin receiver in the body. Deformation of the pin by advancement of the screw is measured by the dial indicator as compared to a reference length pin.
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