Patent US2702685A successfully refreshed from Google Patents.
Patent US3774895A successfully refreshed from Google Patents.
US3774895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic impact absorber
Assignee: ThyssenKrupp Bilstein GmbH
•
Filing: 1972-06-20
•
Granted: 1973-11-27
•
Expires: 1992-06-20
Abstract
Abstract A hydraulic impact absorber designed particularly for the front and rear ends of motor vehicles which can absorb impacts by radial expansion of a resilient liquid-filled bag upon compression of a pair of telescopic tubes secured to and encircled by the bag. The bag has restorative properties permitting repeated use of the impact absorber up to a predetermined impact velocity. Special provision is made for controlled throttling of the damping liquid in its passage within the impact absorber in the event of compression under impact.
Inventors
- 👤 Jean Herbert Willich
- 👤 Johannes J Debaan
- 👤 Erich Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:53
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; F16F9/10; F16F9/3207; F16F9/3235; F16F9/3257; F16F9/34; F16F9/346; F16F2230/00; F16F2230/10; F16F2230/20
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
116 words
A hydraulic impact absorber comprising two telescopically movable tubes containing damping liquid, a resilient bag encircling and secured to said tubes, said bag being arranged to receive damping liquid expelled from the tubes through throttling port means upon compression of the tubes and at the end of a compRession stroke being able to restore itself resiliently, wherein the length of the sliding and mutually guiding overlapping surfaces of the two tubes in the rest position of the impact absorber is at least as great as the diameter of the said surfaces, wherein said diameter is less than the maximum stroke length, and wherein the resilient bag is formed as a tubular rolling bag with reinforcing means.
Claim 2
Dependent Claim
116 words
A hydraulic impact absorber comprising two telescopically movable tubes containing damping liquid, a resilient bag encircling and secured to said tubes, said bag being arranged to receive damping liquid expelled from the tubes through throttling port means upon compression of the tubes and at the end of a compRession stroke being able to restore itself resiliently, wherein the length of the sliding and mutually guiding overlapping surfaces of the two tubes in the rest position of the impact absorber is at least as great as the diameter of the said surfaces, wherein said diameter is less than the maximum stroke length, and wherein the resilient bag is formed as a tubular rolling bag with reinforcing means.
Claim 3
Dependent Claim
27 words
An impact absorber as claimed in claim 1, in which the damping liquid is held permanently under a pressure greater than atmospheric pressure by the resilient bag.
Claim 4
Dependent Claim
42 words
An impact absorber as claimed in claim 1, in which the resilient bag has a resilient internal layer on the inside of its reinforcing means, and on the outside of its reinforcing means has a dirt-resistant, and preferably ozone-resistant, resilient external layer.
Claim 5
Dependent Claim
28 words
An impact absorber as claimed in claim 1 in which the external diameter of the resilient bag is limited by said reinforcing means with the tubes telescoped together.
Claim 6
Dependent Claim
25 words
An impact absorber as claimed in claim 1 in which the resilient bag has its ends rigidly secured to the respective tubes by fastening rings.
Claim 7
Dependent Claim
27 words
An impact absorber as claimed in claim 1, in which the resilient bag is formed as an end stop limiting the outward relative movement of the tubes.
Claim 8
Dependent Claim
100 words
An impact absorber as claimed in claim 1, in which the throttling port means comprises a plurality of ports provided through one of said tubes, said throttling ports being arranged to be sealed off sequentially by the other tube upon inward telescoping movement of the tubes, wherein at the outer end of said one tube provided with said throttling ports there is provided a flange ring encircling and radially spaced from said one tube and overlapping at least certain of the throttling ports adjacent to the tube outer end, and wherein said flange ring has the resilient bag mounted thereon.
Claim 9
Dependent Claim
26 words
An impact absorber as claimed in claim 7, in which the throttling ports are shaped to be of increasing cross-section radially outwardly of the tube axis.
Claim 10
Dependent Claim
37 words
An impact absorber as claimed in claim 7, in which the outer tube includes a rigid stop which is arranged to engage against the inner tube with the parts of the impact absorber in their rest positions.
Claim 11
Dependent Claim
58 words
An impact absorber as claimed in claim 9, in which said rigid stop comprises a cross-piece positioned within the internal chamber of the inner tube and carried by an axial rod, the cross-piece being arranged to abut against a stop ring secured in the inner tube when the parts of the impact absorber are in their rest positions.
Claim 12
Dependent Claim
38 words
An impact absorber as claimed in claim 10, in which the cross-piece is of rectangular cross-section viewed in the direction of compression and is positioned offset through 90* relative to a correspondingly shaped aperture in the stop ring.
Claim 13
Dependent Claim
71 words
An impact absorber as claimed in claim 1, in which the throttling port means is formed by a control rod carried by the outer tube, determining the flow cross-section. and displaceable into a bore through a control plate dividing the internal chambers of the tubes from one another, and wherein the internal chamber of the inner tube is connected to the chamber enclosed by the resilient bag by overflow port means.
Claim 14
Dependent Claim
46 words
An impact absorber as claimed in claim 12, in which said control rod is basically cylindrical with a flat surface area in which the annular groove for the sealing ring has a bottom surface which slopes radially inwardly towards the inner end of the inner tube.
Claim 15
Dependent Claim
37 words
An impact absorber as claimed in claim 12, in which the outer tube includes a rigid stop which is arranged to engage against the inner tube with the parts of the impact absorber in their rest positions.
Claim 16
Dependent Claim
55 words
An impact absorber as claimed in claim 14, in which the rigid stop comprises a cross-piece positioned within the internal chamber of the inner tube and carried by said control rod, the cross-piece being arranged to abut against said control plate when the parts of the impaCt decreasing in flow cross-section with increasing compression stroke.
Claim 17
Dependent Claim
20 words
An impact absorber as claimed in claim 12, in which the control rod is floatingly guided within the control plate.
Claim 18
Dependent Claim
49 words
An impact absorber as claimed in claim 16, in which the control plate comprises a guide ring which is only movable radially, and in which a sealing ring is provided axially between a radial shoulder of the guide ring and the inner tube or a support ring secured thereto.
Claim 19
Dependent Claim
27 words
An impact absorber as claimed in claim 17, in which said radial shoulder is positioned between the sealing ring and the inner end of the inner tube.
Claim 20
Dependent Claim
38 words
An impact absorber as claimed in claim 17, in which the control plate includes two support rings held spaced apart and connected rigidly to the inner tube, said support rings holding the guide ring therebetween for radial displacement.
Claim 21
Dependent Claim
49 words
An impact absorber as claimed in claim 19, in which the control plate is rigidly held in the inner end of the inner tube by pressing the tube on to the control plate and thereby reducing the external diameter of the tube in the region of the control plate.
Claim 22
Dependent Claim
38 words
An impact absorber as claimed in claim 1, in which the two tubes fit inside one another with clearance therebetween and a sealing ring is provided in an annular groove in the external surface of the inner tube.
Claim 23
Dependent Claim
14 words
An impact absorber as claimed in claim 21, absorber are in their rest positions.
Claim 24
Dependent Claim
32 words
An impact absorber as claimed in claim 1, in which a filler hole for the damping liquid is provided in a zone of the outer tube not encircled by the resilient bag.
Claim 25
Dependent Claim
21 words
An impact absorber as claimed in claim 1, in which the damping liquid is an oil with a flat viscosity curve.
Claim 26
Dependent Claim
43 words
An impact absorber as claimed in claim 1, having a maximum stroke length corresponding to a particular predetermined impact velocity, but wherein the resilient bag can only receive damping liquid expelled from the tubes in an amount corresponding to only a partial stroke.
Claim 27
Dependent Claim
26 words
An impact absorber as claimed in claim 1, in which the maximum stroke length does not exceed the length of said sliding surfaces of the tubes.
References Cited (Backward Citations)
US1234311A
Cited
US1350414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |