Patent US3837364A successfully refreshed from Google Patents.
US3837364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible sheath for tachometer shafts or the like
Assignee: Frankische Isolierrohr and Metallwaren Werke Gehrueder Kirchner
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Filing: 1972-11-21
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Granted: 1974-09-24
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Expires: 1992-11-21
Abstract
Abstract A synthetic plastic soundproofing and heat-insulating sheath for a tachometer shaft has a thin-walled flexible cylindrical tube which surrounds a first set of hollow flexible ribs and is surrounded by a second set of hollow flexible ribs. The ribs of the first set may constitute circumferentially complete annuli or one or more helices, and the ribs of the second set may extend in parallelism with the axis of the tube or constitute circumferentially complete annuli or one or more helices. The profile of the ribs is rectangular or trapeziform, and the width of helical or annular ribs of the second set may exceed the width of ribs of the first set, as considered in the axial direction of the tube. The ribs of one or both sets may form part of a discrete corrugated tube which is surrounded by or surrounds the cylindrical tube, or portions of the ribs of at least one set may form part of a second tube which is spaced apart from and surrounds or is surrounded by the cylindrical tube.
Inventors
- 👤 H Jenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:55
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/12; F16C; F16C1/00; F16C1/02; F16C1/06; F16C1/26; F16L59/14; F16L59/16; F16C2370/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
91 words
A protective sheath for a flexible drive shaft, particularly of a speedometer, tachometer or an analogous instrument, comprising a flexible synthetic plastic tube having an inner side and an outer side; a first set of flexible ribs adjacent to said inner side and defining a first plurality of compartments adjacent said inner side; and a second set of flexible ribs adjacent to said outer side and defining a second plurality of compartments adjacent said outer side, the ribs of at least one of said sets extending substantially circumferentially of said tube.
Claim 2
Dependent Claim
91 words
A protective sheath for a flexible drive shaft, particularly of a speedometer, tachometer or an analogous instrument, comprising a flexible synthetic plastic tube having an inner side and an outer side; a first set of flexible ribs adjacent to said inner side and defining a first plurality of compartments adjacent said inner side; and a second set of flexible ribs adjacent to said outer side and defining a second plurality of compartments adjacent said outer side, the ribs of at least one of said sets extending substantially circumferentially of said tube.
Claim 3
Dependent Claim
19 words
A sheath as defined in claim 1, wherein the wall thickness of said tube is less than 1 millimeter.
Claim 4
Dependent Claim
24 words
A sheath as defined in claim 1, wherein the ribs of at least one of said sets are of at least substantially annular shape.
Claim 5
Dependent Claim
20 words
A sheath as defined in claim 1, wherein the ribs of said first set are spaced apart from each other.
Claim 6
Dependent Claim
20 words
A sheath as defined in claim 1, wherein the ribs of said second set are spaced apart from each other.
Claim 7
Dependent Claim
26 words
A sheath as defined in claim 1, wherein the ribs of said first set form at least one helix along the inner side of said tube.
Claim 8
Dependent Claim
21 words
A sheath as defined in claim 1, wherein the ribs of said first set form a plurality of circumferentially complete annuli.
Claim 9
Dependent Claim
25 words
A sheath as defined in claim 1, wherein the ribs of said second set extend at least substantially in the longitudinal direction of said tube.
Claim 10
Dependent Claim
19 words
A sheath as defined in claim 8, wherein the ribs of said second set are integral with said tube.
Claim 11
Dependent Claim
22 words
A sheath as defined in claim 1, wherein the ribs of said second set form at least one helix surrounding said tube.
Claim 12
Dependent Claim
24 words
A sheath as defined in claim 1, wherein the ribs of said second set form a plurality of circumferentially complete annuli around said tube.
Claim 13
Dependent Claim
25 words
A sheath as defined in claim 1, wherein the ribs of said second set form a discrete corrugated tube which surrounds said first mentioned tube.
Claim 14
Dependent Claim
19 words
A sheath as defined in claim 12, wherein the corrugations of said corrugated tube form at least one helix.
Claim 15
Dependent Claim
26 words
A sheath as defined in claim 12, wherein the corrugations of said corrugated tube form a plurality of circumferentially complete annuli around said first mentioned tube.
Claim 16
Dependent Claim
27 words
A sheath as defined in claim 1, wherein the ribs of said first set form a discrete corrugated tube which is surrounded by said first mentioned tube.
Claim 17
Dependent Claim
22 words
A sheath as defined in claim 1, wherein the ribs of at least one of said sets exhibit a substantially trapeziform profile.
Claim 18
Dependent Claim
22 words
A sheath as defined in claim 1, wherein the ribs of at least one of said sets exhibit a substantially rectangular profile.
Claim 19
Dependent Claim
41 words
A sheath as defined in claim 1, further comprising a second flexible synthetic plastic tube including portions of one of said sets of ribs, one of said tubes being spaced apart from and being surrounded by the other of said tubes.
Claim 20
Dependent Claim
51 words
A sheath as defined in claim 1, wherein the ribs of each of said sets extend substantially circumferentially of said tube and the width of ribs in one of said sets, as considered in the longitudinal direction of said tube, exceeds the width of ribs of the other of said sets.
Claim 21
Dependent Claim
27 words
A sheath as defined in claim 1, wherein at least some of the compartments of at least one of said pluralities of compartments communicate with one another.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |