| 摘要 |
<p>MULTIPLE PURPOSE INSTRUMENT HOUSING A pressure gauge assembly is provided having a pressure responsive mechanism, a case enclosing the mechanism, and a transparent face plate for the front of the case. The case has a back plate and a generally cylindrical wall attached thereto. A plurality of relatively short segmented thread projections, forming a thread of relatively fine pitch, protrude from the outer surface of the wall and extend along a helical path. Additionally, a plurality of protuberances protrude from the inner surface of the wall. Either the projections or the protuberances function to mount the face plate. The back plate may include a portion which is recessed inwardly toward the face plate and a plurality of holes, for blowout protection, distributed about its remaining portion.</p> |
