Patent US4458901A successfully refreshed from Google Patents.
US4458901A
Expired / Lapsed
US
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Backstop (target)
Assignee: PF ACQUISITION Corp A CORP OF MINNESOTA
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Filing: 1982-08-06
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Granted: 1984-07-10
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Expires: 2002-08-06
Abstract
Abstract A target back-stop behind a target area with lamellar rows of lamellae mounted at a distance from one another while the lamellae of a front row of lamellae form a predetermined angle α 1 with the normal of the target area, and while the lamellae of a rear row of lamellae form, in the opposite direction, a predetermined angle α 2 to the normal of the target area. A front end of one lamella of the rear row of lamellae borders on the rear end of one lamella of the front row of lamellae, so that channels will be formed that zigzag between the lamellae, and in which projectiles of widely varying caliber will shuttle to and fro and, in that way, will be braked.
Inventors
- 👤 Allan S. Wojcinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:48
CPC Classifications
F; F41; F41J; F41J13/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
149 words
Target back-stop in which, behind a target surface, separate devices for braking the projectiles, characterized by the fact that the devices consist of series of lamellae that are arranged behind one another, in such a way that the lamellae of the first series (row) of lamellae are inclined, by a predetermined angle (α1) in one direction in relation to the normal of the target surface, and that the lamellae of the second row of lamellae are inclined at an angle (α2) in the opposite direction in relation to the normal of the target surface, that the individual lamellae of the lamellae rows are placed at a distance to one another, and that the front end of one lamella each of the second row of lamellae abuts upon the rear end of one lamella each of the first row of lamellae, that zigzagged channels will be formed between the lamellae.
Claim 2
Dependent Claim
149 words
Target back-stop in which, behind a target surface, separate devices for braking the projectiles, characterized by the fact that the devices consist of series of lamellae that are arranged behind one another, in such a way that the lamellae of the first series (row) of lamellae are inclined, by a predetermined angle (α1) in one direction in relation to the normal of the target surface, and that the lamellae of the second row of lamellae are inclined at an angle (α2) in the opposite direction in relation to the normal of the target surface, that the individual lamellae of the lamellae rows are placed at a distance to one another, and that the front end of one lamella each of the second row of lamellae abuts upon the rear end of one lamella each of the first row of lamellae, that zigzagged channels will be formed between the lamellae.
Claim 3
Dependent Claim
18 words
Target back-stop in accordance with claim 1, characterized by the fact that two rows of lamellae are provided.
Claim 4
Dependent Claim
58 words
Target back-stop in accordance with claim 2, characterized by the fact that the predetermined angle (α1) between the lamellae of the first row of lamellae and the normal to the target surface and the predetermined angle (α2) between the lamellae of the second row of lamellae and the normal to the target surface are of the same magnitude.
Claim 5
Dependent Claim
37 words
Target back-stop in accordance with claim 3, characterized by the fact that the angle (α1) between the lamellae of the first row of lamellae and the normal to the target surface amount to from 20° to 40°.
Claim 6
Dependent Claim
35 words
Target back-stop in accordance with claim 4, characterized by the fact that the angle (α1) between the lamellae of the first row of lamellae and the normal to the target surface amounts to about 25°.
Claim 7
Dependent Claim
37 words
Target back-stop in accordance with claim 5, characterized by the fact that the angle (α2) between the lamellae of the second row of lamellae and the normal to the target surface amounts to from 20° to 40°.
Claim 8
Dependent Claim
35 words
Target back-stop in accordance with claim 6, characterized by the fact that the angle (α2) between the lamellae of the second row of lamellae and the normal to the target surface amount to about 25°.
Claim 9
Dependent Claim
30 words
Target back-stop in accordance with claim 7, characterized by the fact that the individual lamellae of the row of lamellae are suspended in each case so as to swing freely.
Claim 10
Dependent Claim
50 words
Target back-stop in accordance with claim 8, characterized by the fact that the width of the individual lamellae amount to about 25 cm, that the thickness of the individual lamellae amount to about 20 cm, and that the lamellae are placed at a distance of 30 mm from one another.
Claim 11
Dependent Claim
44 words
Target back-stop in accordance with claim 9, characterized by the fact that the individual lamellae consist of several partial lamellae that have been arranged parallel to one another, and that the upper ends of the partial lamellae are interconnected by means of fastening devices.
Claim 12
Dependent Claim
38 words
Target back-stop in accordance with claim 10, characterized by the fact that the width of the individual partial lamellae amounts to some 25 cm, and that the thickness of the individual partial lamellae amounts to some 10 mm.
Claim 13
Dependent Claim
23 words
Target back-stop in accordance with claim 11, characterized by the fact that the individual lamellae have been subdivided into three parallel partial lamellae.
Claim 14
Dependent Claim
34 words
Target back-stop in accordance with claim 12, characterized by the fact that the individual lamellae consist of a hard rubber material with synthetic fiber mats that have been poured into it in several layers.
Claim 15
Dependent Claim
22 words
Target back-stop in accordance with claim 13, characterized by the fact that the lamellae consist of six layers of hard rubber material.
Claim 16
Dependent Claim
35 words
Target back-stop in accordance with claim 4, characterized by the fact that the angle (α1) between the lamellae of the first row of lamellae and the normal to the target surface amounts to about 30°.
Claim 17
Dependent Claim
36 words
Target back-stop in accordance with claim 6, characterized by the fact that the angle (α2) between the lamellae of the second row of the lamellae and the normal to the target surface amounts to about 30°.
Claim 18
Dependent Claim
58 words
Target back-stop in accordance with claim 1, characterized by the fact that the predetermined angle (α1) between the lamellae of the first row of lamellae and the normal to the target surface and the predetermined angle (α2) between the lamellae of the second row of lamellae and the normal to the target surface are of the same magnitude.
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |