US3649984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roadbed broom and bristle
Assignee: Marmon Group Inc
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Filing: 1970-08-17
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Granted: 1972-03-21
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Expires: 1990-08-17
Abstract
Abstract A bristle element especially adapted for use in a broom machine for a railway roadbed or track. The bristle elements are replaceably mounted on a mandrel rotatable on a horizontal axis. The bristle elements have a core made of a bundle of parallel straight spring-steel splines or wires fixed together at one end in a detachable coupling and encased in a resilient sheath which binds the splines into mutually supporting relation and distributes flexing stress in them away from their fixed end.
Inventors
- 👤 John Knox Kershaw
- 👤 Edwin S Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:19
CPC Classifications
A; A46; A46B; A46B3/00; A46B13/00; A46B13/001; A46B2200/00; A46B2200/30; A46B2200/3093
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
197 words
A bristle element adapted for use on a roadbed broom, comprising a bristle core composed of a bundle of straight spring-steel splines in parallel axial relation, fixed together at one end and relatively slidable with respect to each other over the remainder of their lengths when the bundle is bent, mounting means connected to the fixed end of the bundle of splines for mounting the bristle element to a bristle support, a flexible tubular sheath secured to the fixed end of the bundle and extending therefrom toward and substantially to the free end of said core, said sheath binding the splines together to cause the same to flex together over substantially their entire length when the bristle element is bent, said sheath being formed of resilient material and being of greatest thickness and stiffness adjacent the fixed end of the splines and of decreasing thickness and stiffness toward the free end of the splines and thereby resiliently supporting said bundle of splines against flexure adjacent the fixed end thereof and providing resilient support thereto distributed over substantially the entire length of the bundle of splines and decreasing from the fixed end thereof to the free end thereof.
Claim 2
Dependent Claim
197 words
A bristle element adapted for use on a roadbed broom, comprising a bristle core composed of a bundle of straight spring-steel splines in parallel axial relation, fixed together at one end and relatively slidable with respect to each other over the remainder of their lengths when the bundle is bent, mounting means connected to the fixed end of the bundle of splines for mounting the bristle element to a bristle support, a flexible tubular sheath secured to the fixed end of the bundle and extending therefrom toward and substantially to the free end of said core, said sheath binding the splines together to cause the same to flex together over substantially their entire length when the bristle element is bent, said sheath being formed of resilient material and being of greatest thickness and stiffness adjacent the fixed end of the splines and of decreasing thickness and stiffness toward the free end of the splines and thereby resiliently supporting said bundle of splines against flexure adjacent the fixed end thereof and providing resilient support thereto distributed over substantially the entire length of the bundle of splines and decreasing from the fixed end thereof to the free end thereof.
Claim 3
Dependent Claim
50 words
A bristle element as in claim 1 in which said sheath is in the form of a molded sheath molded about the bundle of splines, thickest at the fixed end of the core and extending with progressively decreasing thickness toward and substantially to the free end of the bristle element.
Claim 4
Dependent Claim
195 words
A broom element adapted for use on a roadbed broom comprising a core composed of a bundle of flexible core elements in parallel relation, fixed together at one end and relatively movable axially with respect to each other over the remainder of their length when the bundle is bent, mounting means connected to the fixed end of the bundle for mounting the broom element to a support, a flexible tubular sheath secured to the fixed end of the bundle and extending therefrom toward and substantially to the free end of said bundle said sheath binding the flexible core elements together to cause the same to flex together over substantially their entire length when the broom element is bent, said sheath being formed of resilient material and being of greatest thickness and stiffness adjacent the fixed end of the bundle and of decreasing thickness and stiffness toward the free end of the bundle and thereby resiliently supporting said bundle of core elements and providing minimum flexure thereof adjacent the fixed end thereof and resilient support distributed over substantially the entire length of the bundle and decreasing from the fixed end thereof to the free end thereof.
Claim 5
Dependent Claim
195 words
A broom element adapted for use on a roadbed broom comprising a core composed of a bundle of flexible core elements in parallel relation, fixed together at one end and relatively movable axially with respect to each other over the remainder of their length when the bundle is bent, mounting means connected to the fixed end of the bundle for mounting the broom element to a support, a flexible tubular sheath secured to the fixed end of the bundle and extending therefrom toward and substantially to the free end of said bundle said sheath binding the flexible core elements together to cause the same to flex together over substantially their entire length when the broom element is bent, said sheath being formed of resilient material and being of greatest thickness and stiffness adjacent the fixed end of the bundle and of decreasing thickness and stiffness toward the free end of the bundle and thereby resiliently supporting said bundle of core elements and providing minimum flexure thereof adjacent the fixed end thereof and resilient support distributed over substantially the entire length of the bundle and decreasing from the fixed end thereof to the free end thereof.
Claim 6
Dependent Claim
195 words
A broom element adapted for use on a roadbed broom, comprising an elongated body having a fixed end and extending therefrom to a free end, mounting means connected to the fixed end for mounting the same to a rotatable support to position the free end for sweeping action as the support is rotated, said body having an outer molded sheath portion of rubber or like resilient material, and having an inner core portion including a plurality of flexible core elements secured at their inner ends to said mounting means and extending longitudinally through said sheath, said broom element being adapted to flex resiliently from its fixed end to its free end in the sweeping action of its free end, the inner end of the body being of greatest thickness and stiffness adjacent its fixed end and of decreasing thickness and stiffness toward its free end, said sheath and core portions interacting to support the said elongated body over substantially its entire length in such flexure and to distribute the flexure over the length of the body with minimum flexure at the fixed end of the body and progressively decreasing flexure toward the free end thereof.
Claim 7
Dependent Claim
195 words
A broom element adapted for use on a roadbed broom, comprising an elongated body having a fixed end and extending therefrom to a free end, mounting means connected to the fixed end for mounting the same to a rotatable support to position the free end for sweeping action as the support is rotated, said body having an outer molded sheath portion of rubber or like resilient material, and having an inner core portion including a plurality of flexible core elements secured at their inner ends to said mounting means and extending longitudinally through said sheath, said broom element being adapted to flex resiliently from its fixed end to its free end in the sweeping action of its free end, the inner end of the body being of greatest thickness and stiffness adjacent its fixed end and of decreasing thickness and stiffness toward its free end, said sheath and core portions interacting to support the said elongated body over substantially its entire length in such flexure and to distribute the flexure over the length of the body with minimum flexure at the fixed end of the body and progressively decreasing flexure toward the free end thereof.
Claim 8
Dependent Claim
197 words
A broom element adapted for use on a roadbed broom, comprising an elongated body having a fixed end and extending therefrom to a free end, mounting means connected to the fixed end for mounting the same to a rotatable support to position the free end for sweeping action as the support is rotated, said body having an outer molded sheath portion of rubber or like resilient material, and having an inner flexible core portion adapted to resist elongation, said core portion being secured at its inner end to said mounting means and extending longitudinally through said sheath, said broom element being adapted to flex resiliently from its fixed end to its free end in the sweeping action of its free end, the inner end of the body being of greatest thickness and stiffness adjacent its fixed end and of decreasing thickness and stiffness towards its free end, said sheath and core portions interacting to support the said elongated body over substantially its entire length in such flexure and to distribute the flexure over the length of the body with minimum flexure at the fixed end of the body and progressively decreasing flexure toward the free end thereof.
Claim 9
Dependent Claim
197 words
A broom element adapted for use on a roadbed broom, comprising an elongated body having a fixed end and extending therefrom to a free end, mounting means connected to the fixed end for mounting the same to a rotatable support to position the free end for sweeping action as the support is rotated, said body having an outer molded sheath portion of rubber or like resilient material, and having an inner flexible core portion adapted to resist elongation, said core portion being secured at its inner end to said mounting means and extending longitudinally through said sheath, said broom element being adapted to flex resiliently from its fixed end to its free end in the sweeping action of its free end, the inner end of the body being of greatest thickness and stiffness adjacent its fixed end and of decreasing thickness and stiffness towards its free end, said sheath and core portions interacting to support the said elongated body over substantially its entire length in such flexure and to distribute the flexure over the length of the body with minimum flexure at the fixed end of the body and progressively decreasing flexure toward the free end thereof.
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |