US3693768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact absorber for railroad cars
Assignee: TDK Micronas GmbH
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Filing: 1970-10-14
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Granted: 1972-09-26
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Expires: 1990-10-14
Abstract
Abstract A railroad car impact absorber having a fluid filled cylinder with a matching piston movable in the cylinder to force fluid through an orifice in the piston, the area of the orifice varying with the piston position by means of a grooved throttle rod attached to the cylinder and extending into the orifice. A floating piston in the chamber on the other side of the piston forms a gas return spring. The throttle rod causes a lower deceleration during the first part of the piston displacement than during the second part of the displacement.
Inventors
- 👤 Hans Erdmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
CPC Classifications
B; B61; B61D; B61D45/00; B61D45/008; F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/342
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
560 words
An impact absorbing device comprising: a hollow cylinder having a longitudinal axis; a first member disposed transverse of said axis secured to one end of said cylinder; a flange secured to the other end of said cylinder, said flange extending radially toward said axis a predetermined distance from the inner surface of said cylinder, the inner surface of said flange being radially spaced from said axis to provide a circular opening coaxial of said axis; a piston member slidably sealed to the inner surface of said cylinder, said piston member having a portion thereof coextensive with the transverse surface of said flange adjacent said first member and an aperture therethrough offset with respect to said axis; a control rod secured to the inner transverse surface of said first member and extending parallel to and offset with respect to said axis through said aperture, said rod having three grooves formed by three equally spaced radially extending rib members disposed therealong, each of said grooves increasing in depth as defined by the width of said rib member in a predetermined relationship from a point against said first member to the end of said rod; a hollow tubular piston rod having one end secured to the transverse surface of said piston member remote from said first member and slidably sealed to said inner surface of said flange, said piston rod being disposed coaxially of an extension of said axis; a second member disposed transverse of said extension of said axis secured to the other end of said piston rod; a cup-shaped separating piston slidably sealed to the inner surface of said piston rod, the bottom of said cup-shaped piston facing said piston member; a first chamber defined by the inner transverse surface of said first member, the inner surface of said cylinder and the transverse surface of said piston member facing the inner transverse surface of said first member; a second chamber defined by the outer surface of said piston rod, the inner surface of said cylinder, the transverse surface of said flange facing said inner transverse surface of said first member and the transverse surface of said portion of said piston member remote from said inner transverse surface of said first member; a third chamber defined by the inner surface of said piston rod, said bottom of said cup-shaped piston and the transverse surface of said piston member within said piston rod facing said bottom of said cup-shaped piston; a fourth chamber defined by the inner surface of said piston rod, the transverse surface of said second member facing said cup-shaped piston and the concave surface of said cup-shaped piston; a duct disposed solely within said piston member interconnecting said second and third chambers; a pressure medium disposed within said first, second and third chambers; and a pressure gas disposed within said fourth chamber; said first and fourth chambers decreasing in size and said second and third chambers increasing in size when said piston member moves toward said first member due to impact to absorb said impact; and during the movement of said piston member toward said first member the flow of said pressure medium is from said first chamber to said third chamber through said aperture under control of said control rod and the flow of said pressure medium is from said third chamber to said second chamber through said duct.
Claim 2
Dependent Claim
560 words
An impact absorbing device comprising: a hollow cylinder having a longitudinal axis; a first member disposed transverse of said axis secured to one end of said cylinder; a flange secured to the other end of said cylinder, said flange extending radially toward said axis a predetermined distance from the inner surface of said cylinder, the inner surface of said flange being radially spaced from said axis to provide a circular opening coaxial of said axis; a piston member slidably sealed to the inner surface of said cylinder, said piston member having a portion thereof coextensive with the transverse surface of said flange adjacent said first member and an aperture therethrough offset with respect to said axis; a control rod secured to the inner transverse surface of said first member and extending parallel to and offset with respect to said axis through said aperture, said rod having three grooves formed by three equally spaced radially extending rib members disposed therealong, each of said grooves increasing in depth as defined by the width of said rib member in a predetermined relationship from a point against said first member to the end of said rod; a hollow tubular piston rod having one end secured to the transverse surface of said piston member remote from said first member and slidably sealed to said inner surface of said flange, said piston rod being disposed coaxially of an extension of said axis; a second member disposed transverse of said extension of said axis secured to the other end of said piston rod; a cup-shaped separating piston slidably sealed to the inner surface of said piston rod, the bottom of said cup-shaped piston facing said piston member; a first chamber defined by the inner transverse surface of said first member, the inner surface of said cylinder and the transverse surface of said piston member facing the inner transverse surface of said first member; a second chamber defined by the outer surface of said piston rod, the inner surface of said cylinder, the transverse surface of said flange facing said inner transverse surface of said first member and the transverse surface of said portion of said piston member remote from said inner transverse surface of said first member; a third chamber defined by the inner surface of said piston rod, said bottom of said cup-shaped piston and the transverse surface of said piston member within said piston rod facing said bottom of said cup-shaped piston; a fourth chamber defined by the inner surface of said piston rod, the transverse surface of said second member facing said cup-shaped piston and the concave surface of said cup-shaped piston; a duct disposed solely within said piston member interconnecting said second and third chambers; a pressure medium disposed within said first, second and third chambers; and a pressure gas disposed within said fourth chamber; said first and fourth chambers decreasing in size and said second and third chambers increasing in size when said piston member moves toward said first member due to impact to absorb said impact; and during the movement of said piston member toward said first member the flow of said pressure medium is from said first chamber to said third chamber through said aperture under control of said control rod and the flow of said pressure medium is from said third chamber to said second chamber through said duct.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |