Flapper valve blade for a concrete pump or the like

- Thomsen Equipment Company
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Description

FIG. 1 is a top plan view of the flapper valve blade for a concrete pump, or the like, showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof, the rear being the same as the front shown; and

FIG. 4 is an end elevational view thereof, the opposite end being the same as the end shown.

Referenced Cited
U.S. Patent Documents
RE26820 March 1970 Bennett
D202835 November 1966 Bennett
D202836 November 1966 Bennett
D218518 August 1970 Oden
D219778 January 1971 Leeming
3194271 July 1965 Viessmann
3295554 January 1967 Huppert
3545893 December 1970 Schlecht
3829254 August 1974 Stetter et al.
Foreign Patent Documents
1024299 February 1958 DE
1280109 November 1960 FR
Patent History
Patent number: D252515
Type: Grant
Filed: May 20, 1977
Date of Patent: Jul 31, 1979
Assignee: Thomsen Equipment Company (Gardena, CA)
Inventor: John T. McGraw (Laguna Beach, CA)
Primary Examiner: James R. Largen
Attorney: Edward J. DaRin
Application Number: 5/798,914
Classifications
Current U.S. Class: Pump Or Compressor (D15/7); D23/19
International Classification: D1502;