Patent US3853311A successfully refreshed from Google Patents.
US3853311A
Expired / Lapsed
US
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Shock absorber for automobile bumper
Assignee: ZF Friedrichshafen AG
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Filing: 1973-02-20
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Granted: 1974-12-10
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Expires: 1993-02-20
Abstract
Abstract In a telescoping shock absorber, the flow section of the throttling passage between two fluid-filled compartments is determined by an axial slot in a sleeve bounding a conduit between the two compartments. The slot constitutes the orifice of the conduit in one of the compartments, and is axially defined at one end by a partition which separates the two compartments and is attached to one of the two telescoping members of the shock absorber, the sleeve being attached to the other member so that the size of the orifice is reduced when the shock absorber is shortened by an applied force.
Inventors
- 👤 D Kreuzer
- 👤 D Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:46
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/48; F16F9/486; B; B60; B60R; B60R19/00; B60R19/02; B60R19/24; B60R19/26; B60R19/32; F16F9/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
205 words
An elongated shock absorber comprising, in combination: a. a cylinder member having an axis and defining a sealed cavity therein; b. a piston rod member axially projecting from said cavity and engaging said cylinder member for relative axial movement between a first position in which the axial length of said shock absorber reaches a maximum, and a second position in which said length reaches a minimum; c. a piston attached to said piston rod member in said cavity and dividing said cavity into first and second axially offset chambers; d. yieldably resilient means biasing said members toward said first position; e. a sleeve member lining the inner face of said cylinder member in said cavity and movably engaging said piston, respective axial portions of said sleeve member extending in said chambers, 1. said sleeve member bounding a permanently open conduit between said chambers and being formed with an axial slot, 2. a portion of said slot longitudinally defined by said piston constituting the orifice of said conduit in said first chamber, the flow section of said orifice varying during relative movement of said sleeve member and said piston; and f. fluid filling said chambers and said conduit under the pressure of said yieldably resilient means.
Claim 2
Dependent Claim
205 words
An elongated shock absorber comprising, in combination: a. a cylinder member having an axis and defining a sealed cavity therein; b. a piston rod member axially projecting from said cavity and engaging said cylinder member for relative axial movement between a first position in which the axial length of said shock absorber reaches a maximum, and a second position in which said length reaches a minimum; c. a piston attached to said piston rod member in said cavity and dividing said cavity into first and second axially offset chambers; d. yieldably resilient means biasing said members toward said first position; e. a sleeve member lining the inner face of said cylinder member in said cavity and movably engaging said piston, respective axial portions of said sleeve member extending in said chambers, 1. said sleeve member bounding a permanently open conduit between said chambers and being formed with an axial slot, 2. a portion of said slot longitudinally defined by said piston constituting the orifice of said conduit in said first chamber, the flow section of said orifice varying during relative movement of said sleeve member and said piston; and f. fluid filling said chambers and said conduit under the pressure of said yieldably resilient means.
Claim 3
Dependent Claim
54 words
a portion of said slot longitudinally defined by said piston constituting the orifice of said conduit in said first chamber, the flow section of said orifice varying during relative movement of said sleeve member and said piston; and f. fluid filling said chambers and said conduit under the pressure of said yieldably resilient means.
Claim 4
Dependent Claim
54 words
a portion of said slot longitudinally defined by said piston constituting the orifice of said conduit in said first chamber, the flow section of said orifice varying during relative movement of said sleeve member and said piston; and f. fluid filling said chambers and said conduit under the pressure of said yieldably resilient means.
Claim 5
Dependent Claim
43 words
An elongated shock absorber comprising, in combination: a. two longitudinally terminal members engaged for relative longitudinal movement between a first position in which the length of said shock absorber reaches a maximum, and a second position in which said length reaches a minimum,
Claim 6
Dependent Claim
43 words
An elongated shock absorber comprising, in combination: a. two longitudinally terminal members engaged for relative longitudinal movement between a first position in which the length of said shock absorber reaches a maximum, and a second position in which said length reaches a minimum,
Claim 7
Dependent Claim
11 words
respective axial portions of said sleeve member extendin in said chambers,
Claim 8
Dependent Claim
11 words
respective axial portions of said sleeve member extendin in said chambers,
Claim 9
Dependent Claim
78 words
said first chamber being longitudinally adjacent one of said members, and the second chamber being longitudinally adjacent the other member; b. yieldably resilient means biasing said members toward said first position; c. a partition secured to said other member and longitudinally separating said chambers; d. a tubular sleeve member having an axis extending substantially longitudinally of said shock absorber and having an axial bore axially open toward said second chamber in all relative positions of said terminal members,
Claim 10
Dependent Claim
78 words
said first chamber being longitudinally adjacent one of said members, and the second chamber being longitudinally adjacent the other member; b. yieldably resilient means biasing said members toward said first position; c. a partition secured to said other member and longitudinally separating said chambers; d. a tubular sleeve member having an axis extending substantially longitudinally of said shock absorber and having an axial bore axially open toward said second chamber in all relative positions of said terminal members,
Claim 11
Dependent Claim
40 words
A shock absorber as set forth in claim 2, wherein said bore has an effective flow sEction at least equal to the effective flow section of said orifice in all relative positions of said sleeve member and of said partition.
Claim 12
Dependent Claim
26 words
said sleeve member being formed with an axially elongated slot connecting said bore to said first chamber in all relative positions of said longitudinally terminal members,
Claim 13
Dependent Claim
26 words
said sleeve member being formed with an axially elongated slot connecting said bore to said first chamber in all relative positions of said longitudinally terminal members,
Claim 14
Dependent Claim
64 words
A shock absorber as set forth in claim 3, further comprising securing means securing said sleeve member to said one terminal member while permitting limited longitudinal movement of said sleeve member over a distance substantially smaller than the difference between said maximum length and said minimum length, and sealing means sealing said sleeve member to said one terminal member during said limited movement thereof.
Claim 15
Dependent Claim
54 words
a portion of said slot longitudinally defined by said partition constituting an orifice of said bore in said first chamber, the flow section of said orifice varying during relative movement of said sleeve member and said partition; and e. fluid filling said chambers and said bore under the pressure of said yieldably resilient means.
Claim 16
Dependent Claim
54 words
a portion of said slot longitudinally defined by said partition constituting an orifice of said bore in said first chamber, the flow section of said orifice varying during relative movement of said sleeve member and said partition; and e. fluid filling said chambers and said bore under the pressure of said yieldably resilient means.
Claim 17
Dependent Claim
41 words
A shock absorber as set forth in claim 2, wherein said terminal members are tubular, said other member being received in said one member for telescoping movement and bounding said second chamber, said first chamber being contained within said one member.
Claim 18
Dependent Claim
45 words
A shock absorber as set forth in claim 2, further comprising a pressure relief valve in said partition biased toward the closed position and responsive to a pressure in said first chamber substantially greater than the pressure in said second chamber for connecting said chambers.
Claim 19
Dependent Claim
78 words
A shock abosrber as set forth in claim 6, further comprising a check valve in said partition responsive to a pressure in said second chamber higher than the pressure in said first chamber for opening a passage in said partition and connecting said chambers, the pressure difference between said chambers sufficient for opening of said passage by said check valve being much smaller than the pressure difference required for causiong said pressure relief valve to connect said chambers.
Claim 20
Dependent Claim
34 words
A shock absorber as set forth in claim 1, wherein said sleeve member is unitary piece of sheet material of uniform thickness, said slot extending over the entire axial length of said sleeve member.
Claim 21
Dependent Claim
33 words
A shock absorber as set forth in claim 2, further comprising fastening means on said terminal members for fastening the same to the body and to a bumper of an automotive vehicle respectively.
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |