US4889030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile equipped with deployable parachute
Assignee: Rheinmetall Industrie AG
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Filing: 1987-11-05
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Granted: 1989-12-26
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Expires: 2007-11-05
Abstract
Abstract A projectile has at two parts (3, 4) axially arranged one behind the other and mutually linked, of which at least one contains a deployable parachute (6, 6'). In order to achieve a design that ensures a smooth and reliable separation of the parts (3, 4), followed by the deployment of the parachute (6, 6'), both parts (3, 4) are mutually linked by radial bolts (19) that can be radially actuated by the gas pressure generated by at least one pyrotechnic load (15) and radially moved by the gas pressure, thus separating the two parts (3, 4). The pyrotechnic load (15) can be ignited by a fuse (9).
Inventors
- 👤 Werner Grosswendt
- 👤 Klaus Unterstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:37
CPC Classifications
F; F42; F42B; F42B15/00; F42B15/36; F42B10/00; F42B10/32; F42B10/48; F42B10/56
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
137 words
In a projectile including at least two sections arranged axially in tandem, a plurality of radial bolts disposed in respective radially extending bores connecting said two sections together, means, disposed in said projectile and including a pyrotechnic charge and a fuse for causing ignition of said charge, for producing a gas pressure for radially displacing said bolts to release the connection between and separate said two sections of said projectile, and at least one deployable parachute accommodated in one of said two sections; the improvement wherein said means for generating a gas pressure for radially displacing said bolts include gas conducting channels leading from said pyrotechnic charge to said radial bores to directly apply said gas pressure to a respective frontal face of each of said plurality of bolts which is to be charged with gas pressure.
Claim 2
Dependent Claim
137 words
In a projectile including at least two sections arranged axially in tandem, a plurality of radial bolts disposed in respective radially extending bores connecting said two sections together, means, disposed in said projectile and including a pyrotechnic charge and a fuse for causing ignition of said charge, for producing a gas pressure for radially displacing said bolts to release the connection between and separate said two sections of said projectile, and at least one deployable parachute accommodated in one of said two sections; the improvement wherein said means for generating a gas pressure for radially displacing said bolts include gas conducting channels leading from said pyrotechnic charge to said radial bores to directly apply said gas pressure to a respective frontal face of each of said plurality of bolts which is to be charged with gas pressure.
Claim 3
Dependent Claim
22 words
Projectile according to claim 1 wherein said pyrotechnic charge is ignited by a flame capsule disposed in the projectile adjacent the charge.
Claim 4
Dependent Claim
11 words
Projectile according to claim 1, wherein said fuses are delayed-action fuses.
Claim 5
Dependent Claim
59 words
A projectile according to claim 1 wherein said bolts are displaceable radially inwardly by the gas pressure and are provided with larger diameter piston portions at their interior ends; and said gas conducting channels open into said bores exteriorly of the respective exterior frontal faces of said piston portions which are charged by the gas pressure from the exterior.
Claim 6
Dependent Claim
56 words
Projectile according to claim 1 wherein one of said two sections accommodates an insert which is provided with said radial bores for the bolts and accommodates said pyrotechnic charge and said gas conducting channels which lead from the pyrotechnic charge to the respective frontal faces of the bolts which are to be charged with gas pressure.
Claim 7
Dependent Claim
44 words
A projectile as defined in claim 5 wherein: said one section accommodating said parachute is a tail section of said projectile; said insert is fastened to the second of said two connected sections at its rear; and said parachute is connected to said insert.
Claim 8
Dependent Claim
27 words
Projectile according to claim 5 wherein said insert is disposed in the second of said two connected sections and is connected with said parachute by an eye.
Claim 9
Dependent Claim
22 words
Projectile according to claim 7, wherein said insert accommodates a bearing by which the eye is held rotatable relative to the insert.
Claim 10
Dependent Claim
58 words
Projectile according to claim 5 wherein: said bolts are displaceable radially inwardly by the gas pressure and are provided with larger diameter piston portions at their interior ends; and said gas conducting channels open into said bores exteriorly of the respective exterior frontal faces of said piston portions which are charged by the gas pressure from the exterior.
Claim 11
Dependent Claim
59 words
Projectile according to claim 9, wherein said gas conducting channels include an annular channel disposed on the exterior circumference of said insert with said annular channel opening into said bores adjacent to the outwardly oriented frontal face of the respective piston portions and being connected with further gas conducting channels which open into the region containing the pyrotechnic charge.
Claim 12
Dependent Claim
14 words
Projectile according to claim 9, wherein said bolts are provided with axial passage openings.
Claim 13
Dependent Claim
49 words
Projectile according to claim 1 wherein: said bolts can be displaced radially outwardly by the gas pressure; said gas conducting channels open into said bores so that the respective interior frontal faces of said bolts can be charged with gas pressure; and said bolts are secured by shear means.
Claim 14
Dependent Claim
13 words
Projectile according to claim 12, wherein said shear means are axial shear pins.
Claim 15
Dependent Claim
56 words
Projectile according to claim 12, wherein: said one section is the tail section of said projectile; each bolt is screwed to a clamp which connects the other section with the tail section; and said clamps are releasable from the other section and from the tail section by the radial displacement of the bolt toward the outside.
Claim 16
Dependent Claim
12 words
Projectile according to claim 12, wherein said shear means are shear discs.
Claim 17
Dependent Claim
18 words
Projectile according to claim 15, wherein said shear discs are held by said bolts which are two-part bolts.
Claim 18
Dependent Claim
27 words
Projectile according to claim 15, wherein said bores are configured as threaded bores and each receives a threaded ring which supports the shear disc toward the exterior.
Claim 19
Dependent Claim
47 words
Projectile according to claim 15 wherein a ring which surrounds the respective bolt is inserted between the bottom of each bore and the respective shear disc, with the gas conducting channels opening within the ring into the space between the bolts and the bottom of respective bore.
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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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |