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Patent US4033224A successfully refreshed from Google Patents.
US4033224A
Expired / Lapsed
US
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Liquid propellant gun
Assignee: United States Department of the Navy
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Filing: 1976-09-16
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Granted: 1977-07-05
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Expires: 1996-09-16
Abstract
Abstract A liquid propellant gun featuring concentric propellant pump, valve and b. Forward movement of the bolt causes forward movement of the propellant pump by interconnection of ball detents. The valve is forced open by differential pressure and closed by abutment of pump surfaces. At this juncture the ball detent connection is relieved and the bolt continues forward to pressurize the propellant charge before firing.
Inventors
- 👤 John W. Holtrop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:42
CPC Classifications
F; F41; F41A; F41A1/00; F41A1/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
In a liquid propellant gun having a barrel, a receiver, a chamber, a bolt slidably mounted in said receiver and chamber for reciprocating motion along the axis of said barrel, and means for injection of fuel for firing a round from said barrel, the improvement comprising: valve means in said receiver cooperating with said bolt for controlling access of fuel to said chamber; pump means in said receiver coaxial with said bolt and cooperating with said valve means and said bolt to pressurize fuel in said chamber. interconnecting means linking said valve means and said pump means and responsive to action of said bolt to effect injection of fuel from said chamber to a position between the bolt and the round.
Claim 2
Dependent Claim
121 words
In a liquid propellant gun having a barrel, a receiver, a chamber, a bolt slidably mounted in said receiver and chamber for reciprocating motion along the axis of said barrel, and means for injection of fuel for firing a round from said barrel, the improvement comprising: valve means in said receiver cooperating with said bolt for controlling access of fuel to said chamber; pump means in said receiver coaxial with said bolt and cooperating with said valve means and said bolt to pressurize fuel in said chamber. interconnecting means linking said valve means and said pump means and responsive to action of said bolt to effect injection of fuel from said chamber to a position between the bolt and the round.
Claim 3
Dependent Claim
34 words
The liquid propellant gun of claim 1 wherein said interconnecting means comprises a sphere confined in a closely fitting opening in said pump means and riding in an elongated slot in said valve means.
Claim 4
Dependent Claim
42 words
The liquid propellant gun of claim 1 wherein said interconnecting means comprises at least one detent member slidably mounted in a bore in said pump means and including a portion thereof riding in a slot in a portion of said valve means.
Claim 5
Dependent Claim
22 words
The liquid propellant gun of claim 1 wherein said valve means is biased to a closed position by a constant fluid pressure.
Claim 6
Dependent Claim
42 words
The liquid propellant gun of claim 4 wherein said interconnecting means comprises at least one detent member slidably mounted in a bore in said pump means and including a portion thereof riding in a slot in a portion of said valve means.
Claim 7
Dependent Claim
16 words
The liquid propellant gun of claim 5 and each said detent member being a metal sphere.
Claim 8
Dependent Claim
92 words
The liquid propellant gun of claim 1 further including: a first tapered surface forming a portion of the forward wall of said chamber in line with the forward end of said valve means; and a second tapered surface on the forward end of said valve means; said tapered surfaces being at slightly differing angles to the longitudinal axis of the barrel so as to form a wedge shaped pumping area; whereby, when propellant is forced into said chamber, pressure building up in said pumping area will cause opening of said valve means.
Claim 9
Dependent Claim
22 words
The liquid propellant gun of claim 7 wherein said valve means is biased to a closed position by a constant fluid pressure.
Claim 10
Dependent Claim
42 words
The liquid propellant gun of claim 7 wherein said interconnecting means comprises at least one detent member slidably mounted in a bore in said pump means and including a portion thereof riding in a slot in a portion of said valve means.
Claim 11
Dependent Claim
16 words
The liquid propellant gun of claim 9 and each said detent member being a metal sphere.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |