US3913707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorbing device
Assignee: Hoganas AB
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Filing: 1974-08-16
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Granted: 1975-10-21
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Expires: 1994-08-16
Abstract
Abstract A shock absorbing device contains an energy absorbing member in the form of a porous metal body. A piston having a widening portion is arranged to be driven into the porous metal body. The widening portion of the piston compacts the porous metal in a direction transverse to the direction of movement of the piston. The retardation of the piston remains substantially constant during the travel of the piston through the porous metal body.
Inventors
- 👤 Erik Goran Wastenson
- 👤 Gote Allan Carlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:02
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/01; F16F7/12; F16F7/125
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
264 words
A shock absorbing device for a vehicle comprising a housing, means for fastening said housing to a first part of the vehicle, an energy absorbing member positioned in said housing and comprising a porous metal body having a central opening extending therethrough, said porous metal body is capable of being compacted, an axially extending piston having a first end and a second end spaced apart in the axial direction thereof, means for fastening the second end of said piston to a second part of the vehicle, the first end of said piston positioned within said housing and having a first portion extending from the first end and positiOned within said central opening of said porous metal body in closely fitting contact therewith, a second portion of said piston located closer to the second end thereof having a cross-sectional area greater than that of the first portion but less than that of said porous metal body, and a third portion located between said first and second portions and having tapering surfaces diverging in the direction toward the second end of said piston, said third portion arranged to compact said porous metal body in the direction transverse to the axial direction of the piston when the piston is forced to penetrate into the porous metal body as said first and second parts of the vehicle move toward one another during a collision, said porous metal body positioned within said housing having one end thereof remote from the piston abutting an end of said housing so as to prevent the axial movement of said porous metal body.
Claim 2
Dependent Claim
264 words
A shock absorbing device for a vehicle comprising a housing, means for fastening said housing to a first part of the vehicle, an energy absorbing member positioned in said housing and comprising a porous metal body having a central opening extending therethrough, said porous metal body is capable of being compacted, an axially extending piston having a first end and a second end spaced apart in the axial direction thereof, means for fastening the second end of said piston to a second part of the vehicle, the first end of said piston positioned within said housing and having a first portion extending from the first end and positiOned within said central opening of said porous metal body in closely fitting contact therewith, a second portion of said piston located closer to the second end thereof having a cross-sectional area greater than that of the first portion but less than that of said porous metal body, and a third portion located between said first and second portions and having tapering surfaces diverging in the direction toward the second end of said piston, said third portion arranged to compact said porous metal body in the direction transverse to the axial direction of the piston when the piston is forced to penetrate into the porous metal body as said first and second parts of the vehicle move toward one another during a collision, said porous metal body positioned within said housing having one end thereof remote from the piston abutting an end of said housing so as to prevent the axial movement of said porous metal body.
Claim 3
Dependent Claim
103 words
A shock absorbing device according to claim 1, wherein said piston comprises a central opening starting from said second end and extending partially into the interior of said piston, said piston having a spring mounted in said central opening, a rod having one end connected to the end of the spring near said second end, and said means for fastening the second end comprises fastening means connected to said rod at the end remote from that connected to said spring, whereby said shock absorber is prevented from being operated for low velocities of the vehicle, and operated only upon collisions involving high speeds.
References Cited (Backward Citations)
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Cited
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US3744338A
Cited
US3797872A
Cited
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Cited
US3721320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |