Title: Sight glass assembly

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Abstract: A sight glass assembly generally including a housing structure having an opening therethrough, the opening having an enlarged section providing a shoulder, a face plate having an opening registered with the opening in the housing structure, mounted on the housing structure in opposed relation to the shoulder provided by the enlarged section of the housing opening, a lens disposed in the enlarged section of the housing opening and interposed between the shoulder provided by the enlarged section of the housing opening and the face plate, a compressible packing member disposed in the enlarged section of the housing opening between the housing and a periphery of the lens, an outer end of the packing member having an annular recess extending toward the face plate, an annular wedging member disposed on the shoulder provided by the enlarged section of the housing opening and projecting into the recess of the packing member, the wedging member having a cross-sectional area greater than the cross section area of the recess of the packing member in the uncompressed state, and means for securing the face plate to the housing, applying a force on the packing member whereby the packing member is caused to engage the wedging member and expand it laterally to provide a compressive force about the periphery of the lens and effect a seal between the housing structure and the periphery of the lens.


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