Patent US3907080A successfully refreshed from Google Patents.
US3907080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic shock absorber and dust shield
Assignee: Motors Liquidation Co
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Filing: 1974-04-04
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Granted: 1975-09-23
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Expires: 1994-04-04
Abstract
Abstract An injection-moulded polypropylene dust shield tube (stone guard) which can be mounted with a snap-on fit on a flange member carried by a piston rod of a telescopic shock absorber, primarily for use in a motor vehicle, comprises a hollow cylindrical body portion formed adjacent one end with two axially spaced rings of circumferentially equi-spaced internal projections forming internal castellations, arranged with the castellations of the two rings in alternating sequence, and with circumferential clearance between the alternate castellations of the two rings as seen in end elevation. With this construction, the injection moulding may be carried out using a two-part mould core the two parts of which, after moulding, are withdrawn in opposite axial directions without riding over, and thereby possibly damaging, the newly formed internal castellations.
Inventors
- 👤 Stanley Vincent Chadwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:00
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/38; F16L; F16L37/00; F16L37/24; F16L37/244; F16L37/252; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49876
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
304 words
A telescopic shock absorber comprising an inner cylindrical casing having a central longitudinally extending axis, an outer cylindrical casing concentric with and radially spaced from said inner casing, a piston mounted for reciprocating axial movement in said inner cylindrical casing, a reciprocally movable piston rod operatively connected to said piston and extending axially out of said cylindrical casings, a disk-like flange member rigidly secured to a portion of said piston rod extending outwardly of said cylindrical casings, said flange member having an outer peripheral edge portion of predetermined thickness, a dust shield for said shock absorber, said dust shield consisting of a hollow and continuous cylindrical body of flexible plastic material extending around a portion of said rod and a portion of said outer cylindrical casing, said dust shield having a first ring of separate arcuately spaced and inwardly projecting castellations integral with said cylindrical body adjacent to one end thereof, said dust shield further having a second ring of separate arcuately spaced and inwardly projecting castellations integral with said cylindrical body axially spaced a predetermined distance from the first ring of castellations, said first and second rings of castellations providing a seat therebetween to receive said annular peripheral edge portion of said flange member, said castellations of said first and second rings respectively having contact surfaces which face one another for respectively engaging and gripping the upper and lower sides of said peripheral edge portion of said flange member when said flange member is positioned in said seat, said castellations of said second ring being formed with a ramp so that said dust shield can be deflected by said flange member when said flange portion is axially inserted into said dust tube to permit said peripheral portion of said flange member to be subsequently trapped between said first and second rings of castellations.
Claim 2
Dependent Claim
304 words
A telescopic shock absorber comprising an inner cylindrical casing having a central longitudinally extending axis, an outer cylindrical casing concentric with and radially spaced from said inner casing, a piston mounted for reciprocating axial movement in said inner cylindrical casing, a reciprocally movable piston rod operatively connected to said piston and extending axially out of said cylindrical casings, a disk-like flange member rigidly secured to a portion of said piston rod extending outwardly of said cylindrical casings, said flange member having an outer peripheral edge portion of predetermined thickness, a dust shield for said shock absorber, said dust shield consisting of a hollow and continuous cylindrical body of flexible plastic material extending around a portion of said rod and a portion of said outer cylindrical casing, said dust shield having a first ring of separate arcuately spaced and inwardly projecting castellations integral with said cylindrical body adjacent to one end thereof, said dust shield further having a second ring of separate arcuately spaced and inwardly projecting castellations integral with said cylindrical body axially spaced a predetermined distance from the first ring of castellations, said first and second rings of castellations providing a seat therebetween to receive said annular peripheral edge portion of said flange member, said castellations of said first and second rings respectively having contact surfaces which face one another for respectively engaging and gripping the upper and lower sides of said peripheral edge portion of said flange member when said flange member is positioned in said seat, said castellations of said second ring being formed with a ramp so that said dust shield can be deflected by said flange member when said flange portion is axially inserted into said dust tube to permit said peripheral portion of said flange member to be subsequently trapped between said first and second rings of castellations.
References Cited (Backward Citations)
US2788092A
Cited
US2884283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |