US3946637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mortar with variable vent for adjusting velocity of a single charge cartridge
Assignee: United States Department of the Army
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Filing: 1973-10-17
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Granted: 1976-03-30
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Expires: 1993-10-17
Abstract
Abstract A variably adjusted vent communicates with the interior of a mortar tube. adjusting the vent setting, the velocity of a single charge cartridge can be varied. In one embodiment of the invention, the vent discharge is exhausted below the base plate of the mortar to stabilize the mortar during firing.
Inventors
- 👤 Carl J. Campagnuolo
- 👤 Paul A. Curto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:08
CPC Classifications
F; F41; F41F; F41F1/00; F41F1/06; F41A; F41A1/00; F41A1/06; F41A21/00; F41A21/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
A mortar device comprising: a mortar tube for receiving a cartridge, the tube having an exhaust slot formed therein; a second tube radially larger that the mortar tube surrounding the mortar tube and creating an annular passageway between the tubes; arcuate vent valve means positioned in the passageway for sliding displacement over the slot to adjust exposed slot area which communicates with the passageway; and means connected to the the valve means for moving the valve means to a selected position corresponding to a predetermined exposed slot area; thereby permitting the exhaust of cartridge gas from the mortar tube to the atmosphere, via the slot and passageway.
Claim 2
Dependent Claim
107 words
A mortar device comprising: a mortar tube for receiving a cartridge, the tube having an exhaust slot formed therein; a second tube radially larger that the mortar tube surrounding the mortar tube and creating an annular passageway between the tubes; arcuate vent valve means positioned in the passageway for sliding displacement over the slot to adjust exposed slot area which communicates with the passageway; and means connected to the the valve means for moving the valve means to a selected position corresponding to a predetermined exposed slot area; thereby permitting the exhaust of cartridge gas from the mortar tube to the atmosphere, via the slot and passageway.
Claim 3
Dependent Claim
32 words
The subject matter of claim 1 together with a single charge cartridge received in the mortar tube capable of achieving maximum muzzle velocity when the valve means completely closing the exhaust slot.
Claim 4
Dependent Claim
85 words
The subject matter of claim 1 wherein the vent valve means comprises: a first arcuate member located in the annular passageway and disposed in sliding juxtaposition with the mortar tube; a guide slot formed in the second tube for receiving the valve moving means; a second arcuate member located in the annular passageway and disposed in sliding juxtaposition with the second tube for covering the guide slot and preventing gas exhaust therefrom; means connecting the first and second arcuate members for linking the motion therebetween.
Claim 5
Dependent Claim
86 words
The subject mattar as set forth in claim 1 wherein the vent valve means comprises: an arcuate member located in the annular passageway and disposed in sliding juxtaposition with the mortar tube for adjustably covering the exhaust slot, the width of the arcuate member being substantially as wide as the width of the annular passageway; a guide slot formed in the second tube; handle means located in the guide slot and connected to the arcuate member for selectively positioning the arcuate member over the exhaust slot.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |