US3892073A
Expired / Lapsed
US
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Pyrotechnic positioning device
Assignee: Societe Nationale des Poudres et Explosifs
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Filing: 1973-05-24
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Granted: 1975-07-01
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Expires: 1993-05-24
Abstract
Abstract New pyrotechnic positioning device which is useful especially as a tensioning device for safety belts.
Inventors
- 👤 Bernard E Plantif
- 👤 Andre H Hiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/006; B; B60; B60R; B60R22/00; B60R22/18; B60R22/195; B60R22/1954; B60R22/1955; B60R22/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A pyrotechnic positioning device which comprises a cylinder, a piston disposed for movement in one direction within said cylinder, a rod connected to said piston for movement therewith and extending beyond said cylinder to impart such movement to a means to be positioned by the device, a pyrotechnic charge having an annular configuration and disposed within said cylinder in laterally surrounding relation to said rod and behind said piston, said charge being detonatable by means operable from outside said cylinder to propel the piston and rod in said one direction, and unidirectional acting blocking means disposed to allow movement of the rod in said one direction and block movement thereof in the opposite direction.
Claim 2
Dependent Claim
114 words
A pyrotechnic positioning device which comprises a cylinder, a piston disposed for movement in one direction within said cylinder, a rod connected to said piston for movement therewith and extending beyond said cylinder to impart such movement to a means to be positioned by the device, a pyrotechnic charge having an annular configuration and disposed within said cylinder in laterally surrounding relation to said rod and behind said piston, said charge being detonatable by means operable from outside said cylinder to propel the piston and rod in said one direction, and unidirectional acting blocking means disposed to allow movement of the rod in said one direction and block movement thereof in the opposite direction.
Claim 3
Dependent Claim
53 words
A pyrotechnic positioning device according to claim 1 including a breakable fastener connecting the piston to the rod, said fastener being disposed to break and release the piston from the rod upon occurrence of a predetermined tensile force in the rod to correspondingly limit the force exerted upon the means to be positioned.
Claim 4
Dependent Claim
61 words
A pyrotechnic positioning device according to claim 1 wherein said unidirectional acting blocking means includes a plurality of balls arranged between a surface that moves in unison with the rod and a surface that is stationary with respect to the cylinder, said balls being put into jamming engagement with said surfaces to block movement of the rod in said opposite direction.
Claim 5
Dependent Claim
63 words
A pyrotechnic positioning device according to claim 1 wherein said unidirectional acting blocking means includes at least one blocking member arranged between a surface that moves in unison with the rod and a surface that is stationary with respect to the cylinder, said blocking member being put into jamming engagement with said surfaces to block movement of the rod in said opposite direction.
Claim 6
Dependent Claim
20 words
A pyrotechnic positioning device according to claim 1 wherein said charge is disposed in endwise abutting contact with the piston.
Claim 7
Dependent Claim
24 words
A pyrotechnic positioning device according to claim 1 wherein said cylinder has at least one orifice operable to clamp the movement of the piston.
Claim 8
Dependent Claim
25 words
A pyrotechnic positioning device according to claim 1 including a deformable member disposed within said cylinder for impact with the piston to absorb energy therefrom.
References Cited (Backward Citations)
US2860736A
Cited
US3459165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |