초록 ▼

A retractable indicator assembly 10 may be mounted on a container C which transmits air through the container and removes deleterious gases with an activated charcoal medium M in the container. An elongate indicator housing 12 has a chamber 20 therein. A male adaptor 14 has external threads 16 for s

A retractable indicator assembly 10 may be mounted on a container C which transmits air through the container and removes deleterious gases with an activated charcoal medium M in the container. An elongate indicator housing 12 has a chamber 20 therein. A male adaptor 14 has external threads 16 for sealing engagement with the container. A plug 40 is provided at the upper end of the housing 12. Housing 12 includes a transparent wall portion 28 for viewing at least a portion of the chamber 20. A litmus indicator 42 is moveable by a retractable rod 54 from a retracted position within the container to an extended position within the chamber 20 of the housing 12. An outer housing 64 is secured to the upper end of the rod 54, and protects the indicator housing 12 while the litmus indicator 42 is in its normally retracted position. The assembly may be manually manipulated between its extended position wherein the litmus indicator may be viewed through the transparent wall 28 of the indicator housing 12, and a retracted position wherein the outer housing 64 encloses the indicator housing 12 and engages the exterior of the container C.

대표청구항 ▼

[ What is claimed is:] [7.] An indicator assembly for mounting on a container having an air input port and an air discharge port for passing air through the interior of the container, the indicator assembly providing an indication of deleterious gases within the interior of the container, the indica

[ What is claimed is:] [7.] An indicator assembly for mounting on a container having an air input port and an air discharge port for passing air through the interior of the container, the indicator assembly providing an indication of deleterious gases within the interior of the container, the indicator assembly comprising:a threaded fitting having external threads for threaded engagement with a threaded aperture within a wall of the container, the threaded fitting having a passageway therethrough;an elongate indicator housing having a lower end adapted to be sealingly engaged with the threaded fitting and an upper plugged end, the indicator assembly having a housing chamber within the indicator housing and having an opening communicating between the housing chamber and the passageway of the threaded fitting, the passageway providing fluid communication with the interior of the container, the indicator housing including a transparent wall portion for viewing at least a portion of the housing chamber;a litmus indicator movable within the passageway between a retracted position within the container and an extended position within the housing chamber, the litmus indicator including a chemically responsive litmus material for changing color in response to the deleterious gases;a retractable rod interconnected with the litmus indicator and extending through the upper plugged end of the indicator housing, the retractable rod comprising means for moving the litmus indicator between the retracted position and the extended position; anda seal for providing sealing and sliding association between the retractable rod and the plugged end of the indicator housing.