US3537621A - Mortar gun and disc therefor - Google Patents

Description

Q i United States Patent I [1l13,537,621

[72] Inventor Walter A. Jesse [56] R fere e Cit d JICIKSDII, North, Unioutown, 44685 I i n 1828 056 10/1931 Lamb 92/250 [2|] Appl. No. 751,396 [22] Filed Aug, 1968 2,958,4l5 ll/l96 0 Jesse 222/386 [45] Patented Nov. 3, 1970 FOREIGN PATENT S 1,270,689 7/l96l France .l 92/250 Primary Examiner-Stanley H. Tollberg Assistant Examiner-11. S. Lane Attorney Freeman & Taylor [54] MORTAR GUN AND DISC THEREFOR l chimdnnwlng Figs ABSTRACT: An improved resilient disc for use on the [52] U.S.Cl. 222/386, plunger of a mortar gun characterized by having a concave 92/2 peripheral groove terminating in opposed feathered edges so [51] Int. Cl. B671! 5/42 that sealing and wiping contact with the interior surface of the Search 2/ barrel of the gun are achieved when the plunger is both advanced and retracted.

Patented Nov. 3, 1970 3,537,621

I NVEN TOR. WALTER A. JESSE BY yummy ATTORNEYS While a full and complete description of the invention has been set forth in accordance with the dictates of the Patent Statutes, it should be understood that modifications thereof may be resorted to without departing from the spirit hereof or the scope of the appended claims.

I claim:

1. In combination witha mortar gun the improvement comprising:

A. an elongate cylindrical barrel;

8. an elongate shaft mounted within said barrel for reciprocal movement therein;

C. a backup plate carried on said shaft; D. a rubbery disc having;

1. opposed flat parallel sides;

2. a substantially solid body with a through axial opening for mounting said disc on said shaft with one side thereof abutting said backup plate; and

3. a concave peripheral edge terminating in opposed feathered edges:

E. the relationship. between the internal diameter of said barrel and the diameter of said disc being such that:

1. said feathered-edges normally contact said barrel and lie in the same plane as said sides while being slightly deformed out of said plane upon movement of said shaft; and

2. with said concave edge of said disc being at all times spaced from said barrel;

F. a pressure plate;

1. carried on said shaft;

2. having one face thereof abutted against the remaining face of said disc with the peripheral edge thereof being disposed in close proximity with one of said feathered edges of said disc;

G. means for releasably securing said backup plate, said disc and said pressure plate in axial alignment on said shaft; and

H. said backup plate having its peripheral edge disposed in close proximity to the remaining feathered edge of said disc.

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