Patent US4172408A successfully refreshed from Google Patents.
US4172408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid propellant gun, breech pressure axial injection
Assignee: United States Department of the Navy
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Filing: 1977-08-29
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Granted: 1979-10-30
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Expires: 1997-08-29
Abstract
Abstract A liquid propellant gun having a chamber adapted to receive a projectile liquid propellant and having a breech area containing a fuel injection system and a valve internally thereof and a bolt which is chambered within said valve and adapted to move from a projectile load to a fire position. The movement of the bolt from projectile load to fire position is done in one movement and this is possible in that the valve is able to hold high-pressure, making unnecessary a forward jogging of the bolt before firing.
Inventors
- 👤 Steve Ayler
- 👤 John Holtrop
- 👤 Bruce Bartels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:29
CPC Classifications
F; F41; F41A; F41A1/00; F41A1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
223 words
In a liquid propellant gun having a chamber adapted to receive a projectile and liquid propellant the combination comprising: a gun having a rear portion with a substantially cylindrical hollow breech area having a central axis; fluid injector means contained within the breech area and having a central axis co-extensive with the axis of the breech area for insecting liquid propellant into said chamber; valve means contained within the breech area and also having a central axis co-extensive with the axis of the breech area for regulating the injection of said liquid propellant in a predetermined manner; a bolt contained within said breech area and having a central axis co-extensive with the axis of the breech area and having unloaded and loaded positions; means for moving said bolt forward from an unloaded to a loaded position; said bolt and fluid injector means cooperating such that when said bolt is moved from the unloaded to the loaded position the fluid injector means is carried along therewith and said valve means is caused to open thereby forcibly injecting liquid propellant into the chamber of said liquid propellant gun duing the initial movement of said bolt forward and where said valve means is closed and sealed upon said bolt reaching its farthest advance such that said gun may be fired without forward jogging of said bolt.
Claim 2
Dependent Claim
223 words
In a liquid propellant gun having a chamber adapted to receive a projectile and liquid propellant the combination comprising: a gun having a rear portion with a substantially cylindrical hollow breech area having a central axis; fluid injector means contained within the breech area and having a central axis co-extensive with the axis of the breech area for insecting liquid propellant into said chamber; valve means contained within the breech area and also having a central axis co-extensive with the axis of the breech area for regulating the injection of said liquid propellant in a predetermined manner; a bolt contained within said breech area and having a central axis co-extensive with the axis of the breech area and having unloaded and loaded positions; means for moving said bolt forward from an unloaded to a loaded position; said bolt and fluid injector means cooperating such that when said bolt is moved from the unloaded to the loaded position the fluid injector means is carried along therewith and said valve means is caused to open thereby forcibly injecting liquid propellant into the chamber of said liquid propellant gun duing the initial movement of said bolt forward and where said valve means is closed and sealed upon said bolt reaching its farthest advance such that said gun may be fired without forward jogging of said bolt.
Claim 3
Dependent Claim
38 words
In a liquid propellant gun as set forth in claim 1 wherein; said fluid injector means and said valve means have an opening therein adapted to receive a projectile for loading into the chamber of said propellant gun.
Claim 4
Dependent Claim
23 words
In a liquid propellant gun as set forth in claim 2 wherein; said fluid injector means lies outside and around said valve means.
Claim 5
Dependent Claim
111 words
A liquid propellant gun as set forth in claim 1 wherein said fluid injector means comprises: a hollow piston slideably mounted in a cylinder surrounding said valve means so as to be carried in a compression stroke when said bolt advances a projectile in said chamber, where the chamber of said liquid propellant gun has a tension closed fitting with said piston which is opened to permit liquid propellant into said chamber when said piston compresses fluid within said hollow piston beyond a predetermined pressure; and a step on the inside diameter of said piston for closing said valve means when said piston is at the end of its compression stroke.
Claim 6
Dependent Claim
49 words
A liquid propellant gun as set forth in claim 4 further comprising a manifold for injecting either fuel or oxidizer to said chamber through an opening on a face of said manifold where said face forms one surface for the tension closed fitting between said chamber and said piston.
Claim 7
Dependent Claim
76 words
A liquid propellant gun as set forth in claim 5 further comprising: a lip seal on said manifold face within said chamber for supporting high pressure in said chamber that does not backup into said fluid injector means such that further advancement of said bolt in said chamber to prevent such back pressure is not required; and a seal on said bolt for preventing high pressure in said chamber during firing from backing around said bolt.
Claim 8
Dependent Claim
196 words
A liquid propellant gun having a chamber adapted to receive a projectile and liquid propellant in the form of fuel and oxidizer comprising: a substantially cylindrical hollow breech area having a central axis for loading a projectile into said chamber; fluid injector means contained within said breech area and having a central axis co-extensive with the axis of said breech area for injecting liquid propellant into said chamber; a bolt contained within said chamber for advancing a projectile forward from its initial placement in said chamber through said breech area; means for moving said bolt forward in said chamber located in the rear portion of said chamber; valve means contained within said breech area and also having a central axis co-extensive with the axis of said breech area for regulating the flow of fuel and oxidizer into said chamber in a predetermined manner, said valve means, fluid injector means and bolt cooperating such that when said bolt advances a projectile forward said fluid injector means pumps liquid propellant between said projectile and said bolt through said valve means; and sealing means within said chamber for preventing back pressure through said valve means or around said bolt.
Claim 9
Dependent Claim
196 words
A liquid propellant gun having a chamber adapted to receive a projectile and liquid propellant in the form of fuel and oxidizer comprising: a substantially cylindrical hollow breech area having a central axis for loading a projectile into said chamber; fluid injector means contained within said breech area and having a central axis co-extensive with the axis of said breech area for injecting liquid propellant into said chamber; a bolt contained within said chamber for advancing a projectile forward from its initial placement in said chamber through said breech area; means for moving said bolt forward in said chamber located in the rear portion of said chamber; valve means contained within said breech area and also having a central axis co-extensive with the axis of said breech area for regulating the flow of fuel and oxidizer into said chamber in a predetermined manner, said valve means, fluid injector means and bolt cooperating such that when said bolt advances a projectile forward said fluid injector means pumps liquid propellant between said projectile and said bolt through said valve means; and sealing means within said chamber for preventing back pressure through said valve means or around said bolt.
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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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |