Vacuum breaker for valve stem packing

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Description

FIG. 1 is a top plan view of a vacuum breaker for valve stem packing showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a perspective cross sectional view taken on line 3--3 of FIG. 1; and

FIG. 4 is an exploded perspective view thereof.

Referenced Cited
U.S. Patent Documents
2270838 January 1942 Langdon
3106935 October 1963 Gatzke
3929150 December 1975 Flinner et al.
Patent History
Patent number: D246251
Type: Grant
Filed: Oct 14, 1975
Date of Patent: Nov 1, 1977
Inventors: Elder F. Hirsch (Greeley, CO), Ronald F. Hirsch (Greeley, CO)
Primary Examiner: James R. Largen
Attorney: Max L. Wymore
Application Number: 5/621,689
Classifications
Current U.S. Class: D23/47
International Classification: D2301;