US3820772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy absorbing unit
Assignee: Motors Liquidation Co
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Filing: 1972-11-24
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Granted: 1974-06-28
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Expires: 1992-11-24
Abstract
Abstract An improved energy absorbing unit of the hydropneumatic type wherein the rate at which the unit returns to a fully extended condition after an impact stroke is retarded, the unit including a piston tube subassembly telescopically disposed on a cylinder tube subassembly, a metering pin on the cylinder tube subassembly adapted for cooperation with an aperture on the piston tube subassembly in defining a primary orifice for throttling the flow of working fluid thereby to effect energy absorption during telescopic collapse of the unit, and a flexible valve disc on the piston tube subassembly adapted to normally seal against the metering pin except during telescopic collapse of the piston tube subassembly when the pressure of the working fluid distends the valve disc. When the valve disc is sealed against the metering pin, as during telescopic extension of the piston tube subassembly, the working fluid is directed through secondary throttling orifices which function to retard the rate of telescopic extension.
Inventors
- 👤 L Kerr
- 👤 J Pees
- 👤 R Riner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:55
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/02; B60R19/24; B60R19/26; B60R19/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
339 words
In a hydropneumatic energy absorbing unit of the type including a cylinder tube subassembly, a piston tube subassembly disposed on said cylinder tube subassembly for relative telescopic collapse and extension, and a tapered metering pin having a circular cross-sectional configuration rigidly attached to said cylinder tube subassembly for cooperation with a circular aperture in said piston tube subassembly in defining an annular primary throttling orifice for a working fluid disposed in a primary chamber in said cylinder tube subassembly, said working fluid being expelled from said primary chamber through said primary throttling orifice into a secondary chamber in said piston tube subassembly during telescopic collapse of the latter and from said secondary chamber into said primary chamber during telescopic extension of said piston tube subassembly, the improvement comprising, a flexible valve disc having a planar configuration and including a centrally located circular aperture and a pair of secondary throttling orifices, means rigidly attaching the periphery of said valve disc to said piston tube subassembly within said secondary chamber and with said valve disc circular aperture in alignment with said piston tube subassembly circular aperture so that said metering pin projects through said aligned apertures and one surface of said valve disc is exposed generally to the pressure of said working fluid in said primary chamber and the opposite surface thereof is exposed to the pressure of said working fluid in said secondary chamber, the pressure of said working fluid in said primary chamber being operative to distend said valve member during telescopic collapse of said piston tube subassembly anD the pressure of said working fluid in said secondary chamber being operative to effect sealing engagement between the marginal edge of said valve member aperture and said metering pin during telescopic extension of said piston tube subassembly, and means defining a flow passage between said secondary throttling orifices and said primary throttling orifice, said working fluid being positively directed through said secondary throttling orifices during telescopic extension of said piston tube subassembly thereby to retard the rate of telescopic extension.
Claim 2
Dependent Claim
339 words
In a hydropneumatic energy absorbing unit of the type including a cylinder tube subassembly, a piston tube subassembly disposed on said cylinder tube subassembly for relative telescopic collapse and extension, and a tapered metering pin having a circular cross-sectional configuration rigidly attached to said cylinder tube subassembly for cooperation with a circular aperture in said piston tube subassembly in defining an annular primary throttling orifice for a working fluid disposed in a primary chamber in said cylinder tube subassembly, said working fluid being expelled from said primary chamber through said primary throttling orifice into a secondary chamber in said piston tube subassembly during telescopic collapse of the latter and from said secondary chamber into said primary chamber during telescopic extension of said piston tube subassembly, the improvement comprising, a flexible valve disc having a planar configuration and including a centrally located circular aperture and a pair of secondary throttling orifices, means rigidly attaching the periphery of said valve disc to said piston tube subassembly within said secondary chamber and with said valve disc circular aperture in alignment with said piston tube subassembly circular aperture so that said metering pin projects through said aligned apertures and one surface of said valve disc is exposed generally to the pressure of said working fluid in said primary chamber and the opposite surface thereof is exposed to the pressure of said working fluid in said secondary chamber, the pressure of said working fluid in said primary chamber being operative to distend said valve member during telescopic collapse of said piston tube subassembly anD the pressure of said working fluid in said secondary chamber being operative to effect sealing engagement between the marginal edge of said valve member aperture and said metering pin during telescopic extension of said piston tube subassembly, and means defining a flow passage between said secondary throttling orifices and said primary throttling orifice, said working fluid being positively directed through said secondary throttling orifices during telescopic extension of said piston tube subassembly thereby to retard the rate of telescopic extension.
Claim 3
Dependent Claim
342 words
In a hydropneumatic energy absorbing unit of the type including a cylinder tube subassembly, a piston tube subassembly disposed on said cylinder tube subassembly for relative telescopic collapse and extension, and a tapered metering pin having a circular cross-sectional configuration rigidly attached to said cylinder tube subassembly for cooperation with a circular aperture in said piston tube subassembly in defining an annular primary throttling orifice for a working fluid disposed in a primary chamber in said cylinder tube subassembly, said working fluid being expelled from said primary chamber through said primary throttling orifice into a secondary chamber in said piston tube subassembly during telescopic collapse of the latter and from said secondary chamber into said primary chamber during telescopic extension of said piston tube subassembly, the improvement comprising, a flexible valve disc having a generally planar configuration and including a secondary throttling orifice and a centrally located circular aperture surrounded by an integral upturned lip, means rigidly attaching the periphery of said valve disc to said piston tube subassembly within said secondary chamber and with said valve disc circular aperture in alignment with said tube subassembly circular aperture so that said metering pin projects through said aligned apertures and one surface of said valve disc is exposed generally to the pressure of said working fluid in said primary chamber and the opposite surface thereof and said integral lip are exposed to the pressure of said working fluid in said secondary chamber, the pressure of said working fluid in said primary chamber being operative to distend said valve member during telescopic collapse of said piston tube subassembly and the pressure of said working fluid in said secondary chamber being operative to effect sealing engagement between said integral lip and said metering pin during telescopic extension of said piston tube subassembly, and means defining a flow passage between said secondary throttling orifice and said primary throttling orifice, said working fluid being positively directed through said secondary throttling orifice during telescopic extension of said piston tube subassembly thereby to retard the rate of telescopic extension.
Claim 4
Dependent Claim
342 words
In a hydropneumatic energy absorbing unit of the type including a cylinder tube subassembly, a piston tube subassembly disposed on said cylinder tube subassembly for relative telescopic collapse and extension, and a tapered metering pin having a circular cross-sectional configuration rigidly attached to said cylinder tube subassembly for cooperation with a circular aperture in said piston tube subassembly in defining an annular primary throttling orifice for a working fluid disposed in a primary chamber in said cylinder tube subassembly, said working fluid being expelled from said primary chamber through said primary throttling orifice into a secondary chamber in said piston tube subassembly during telescopic collapse of the latter and from said secondary chamber into said primary chamber during telescopic extension of said piston tube subassembly, the improvement comprising, a flexible valve disc having a generally planar configuration and including a secondary throttling orifice and a centrally located circular aperture surrounded by an integral upturned lip, means rigidly attaching the periphery of said valve disc to said piston tube subassembly within said secondary chamber and with said valve disc circular aperture in alignment with said tube subassembly circular aperture so that said metering pin projects through said aligned apertures and one surface of said valve disc is exposed generally to the pressure of said working fluid in said primary chamber and the opposite surface thereof and said integral lip are exposed to the pressure of said working fluid in said secondary chamber, the pressure of said working fluid in said primary chamber being operative to distend said valve member during telescopic collapse of said piston tube subassembly and the pressure of said working fluid in said secondary chamber being operative to effect sealing engagement between said integral lip and said metering pin during telescopic extension of said piston tube subassembly, and means defining a flow passage between said secondary throttling orifice and said primary throttling orifice, said working fluid being positively directed through said secondary throttling orifice during telescopic extension of said piston tube subassembly thereby to retard the rate of telescopic extension.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |