Pipe plug latch unit

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Description

FIG. 1 is a top perspective view of a pipe plug latch unit showing our new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image of the right side;

FIG. 3 is a top plan view thereof;

FIG. 4 is another top perspective view thereof showing the unit in an open position;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevation view thereof.

The broken line representation of a pipe plug in FIGS. 1, 2 and 4 and a lock in FIGS. 2 and 4 are for purposes of illustration only and form no part of the claimed design.

Referenced Cited
U.S. Patent Documents
D208016 June 1967 Bullard
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D257218 October 7, 1980 Eriksson
D283246 April 1, 1986 Jack
D300350 March 21, 1989 Mathison
D305927 February 6, 1990 Linderman et al.
2566816 September 1951 Work
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3747541 July 1973 Reese
4073168 February 14, 1978 Takada
4370919 February 1, 1983 Wagner
4415005 November 15, 1983 Janzen
4493344 January 15, 1985 Mathison et al.
4614206 September 30, 1986 Mathison et al.
4762151 August 9, 1988 Kinnan
Other references
  • Morrison Bros Co, Dubuque IA, Monitoring Wall Specification Guide, Apr. 1989, pp. 1-3 and 6. Chama Corp., IN, Monitor Wells product brochure, pp. 1-3, dated Jan. 1, 1989. Crane Enterprises, Helena, MT, Locking Well Caps product brochure, 1986, pp. 1 and 2. EBW, Inc., Muskegon, MI, Well Cap Plugs Advertisement, Feb. 1990/WWJ, p. 1.
Patent History
Patent number: D329686
Type: Grant
Filed: Jun 14, 1990
Date of Patent: Sep 22, 1992
Assignee: Cherne Industries Incorporated (Minneapolis, MN)
Inventors: Allen D. Mathison (Richfield, MN), Bryan R. Benson (North Branch, MN)
Primary Examiner: James R. Largen
Attorney: Anthony G. Eggink
Application Number: 7/538,176
Classifications
Current U.S. Class: Element Or Attachment (D23/249)