Patent US3603574A successfully refreshed from Google Patents.
US3603574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorber for independent front wheel suspension
Assignee: Individual
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Filing: 1969-07-24
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Granted: 1971-09-07
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Expires: 1989-07-24
Abstract
Abstract In a hydropneumatic shock absorber of the piston-and-cylinder type for a front wheel of a motorcar, an annular spacer mounted on the piston rod or on the inner cylinder wall between the piston and the end wall of the cylinder through which the piston rod passes limits radial deflection of the piston rod under stresses due to steering or to travel of the sprung wheel over an obstacle.
Inventors
- 👤 Dieter Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:49
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/36; B; B60; B60G; B60G15/00; B60G15/02; B60G15/06; B60G15/07; F16F9/06; F16F9/062
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
199 words
A shock absorber comprising, in combination: a. a cylinder element enclosing a cavity and having an axis; b. a piston member axially movable in said cavity; c. abutment means limiting the axial movement of said piston member to a predetermined stroke between two terminal positions; d. a piston rod element fastenEd to said piston member and axially extending from the same through an end wall of said cylinder element; and e. spacer means for limiting radial deflection of said piston rod element in said cavity, 2. said spacer means including a spacer member fixedly fastened to one of said elements in said cavity axially intermediate said piston member and said end wall and axially spaced from said end wall and said piston member when said piston member is in a normal position thereof, equidistant from said terminal positions, 2. said spacer member having a face spacedly opposite the other element in the absence of said deflection, 3. the spacing of said face from said other element being but a small fraction of the radial dimension of said piston rod element in said absence and decreasing in response to said radial deflection until said face abuttingly engages said other element.
Claim 2
Dependent Claim
199 words
A shock absorber comprising, in combination: a. a cylinder element enclosing a cavity and having an axis; b. a piston member axially movable in said cavity; c. abutment means limiting the axial movement of said piston member to a predetermined stroke between two terminal positions; d. a piston rod element fastenEd to said piston member and axially extending from the same through an end wall of said cylinder element; and e. spacer means for limiting radial deflection of said piston rod element in said cavity, 2. said spacer means including a spacer member fixedly fastened to one of said elements in said cavity axially intermediate said piston member and said end wall and axially spaced from said end wall and said piston member when said piston member is in a normal position thereof, equidistant from said terminal positions, 2. said spacer member having a face spacedly opposite the other element in the absence of said deflection, 3. the spacing of said face from said other element being but a small fraction of the radial dimension of said piston rod element in said absence and decreasing in response to said radial deflection until said face abuttingly engages said other element.
Claim 3
Dependent Claim
52 words
said spacer means including a spacer member fixedly fastened to one of said elements in said cavity axially intermediate said piston member and said end wall and axially spaced from said end wall and said piston member when said piston member is in a normal position thereof, equidistant from said terminal positions,
Claim 4
Dependent Claim
52 words
said spacer means including a spacer member fixedly fastened to one of said elements in said cavity axially intermediate said piston member and said end wall and axially spaced from said end wall and said piston member when said piston member is in a normal position thereof, equidistant from said terminal positions,
Claim 5
Dependent Claim
17 words
said spacer member having a face spacedly opposite the other element in the absence of said deflection,
Claim 6
Dependent Claim
17 words
said spacer member having a face spacedly opposite the other element in the absence of said deflection,
Claim 7
Dependent Claim
51 words
A shock absorber as set forth in claim 1, wherein said spacer member is fastened to said one element in a position such that the spacer member approximately bisects the axial distance between said end wall and said piston member when said piston member is equidistant from said terminal positions thereof.
Claim 8
Dependent Claim
61 words
A shock absorber as set forth in claim 2, wherein said spacer member is annular about said axis, the shock absorber further comprising a fluid substantially filling said cavity, and means defining respective throttling passages for axial flow of said fluid past said piston member and past said spacer member, when said piston member is equidistant from said terminal positions thereof.
Claim 9
Dependent Claim
42 words
the spacing of said face from said other element being but a small fraction of the radial dimension of said piston rod element in said absence and decreasing in response to said radial deflection until said face abuttingly engages said other element.
Claim 10
Dependent Claim
42 words
the spacing of said face from said other element being but a small fraction of the radial dimension of said piston rod element in said absence and decreasing in response to said radial deflection until said face abuttingly engages said other element.
Claim 11
Dependent Claim
52 words
A shock absorber as set forth in claim 1, wherein said face is annular, and said face and said other element define therebetween a gap for axial flow of fluid past said spacer member, the cross section of said gap decreasing when said piston member approaches one of said terminal positions thereof.
Claim 12
Dependent Claim
56 words
A shock absorber as set forth in claim 4, said spacer member being fixedly fastened to said piston rod member, said cylinder element having a wall opposite said face and formed with an axial groove therein, said spacer member passing an axial end of said groove when said piston member approaches one of said terminal positions.
Claim 13
Dependent Claim
22 words
A shock absorber as set forth in claim 1, further comprising biasing means biasing said piston member toward said normal position thereof.
Claim 14
Dependent Claim
54 words
A shock absorber as set forth in claim 2, further comprising a tubular shell spacedly and substantially coaxially enveloping said cylinder element, and a pressure transmitting member radially interposed between said shell and said cylinder element in approximate radial alignment with said piston member when said piston member is in said normal position thereof.
Claim 15
Dependent Claim
32 words
A shock absorber as set forth in claim 1, further comprising a steering knuckle having an axis transverse to the axis of said cylinder element and fixedly fastened to the last-mentioned element.
Claim 16
Dependent Claim
31 words
A shock absorber as set forth in claim 8, further comprising a helical compression spring extending about said axis, respective axially terminal portions of said spring being fastened to said elements.
Claim 17
Dependent Claim
28 words
A shock absorber as set forth in claim 1, wherein the spacing of said face from said other element in said absence is approximately 0.1 to 0.3 mm.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |