US4260280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Road roller
Assignee: MASCHINENFABRIK LIEZEN AN AUSTRIAN CORP GmbH
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Filing: 1979-02-26
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Granted: 1981-04-07
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Expires: 1999-02-26
Abstract
Abstract A road roller comprises a central frame part, a main drive including a hydraulic pump and a steering control carried by the main frame part. Replaceable roller units each including a frame part detachably mounted on the central frame part at a front and rear end, respectively, of the central frame part comprise front and rear rollers. A hydraulic motor and a hydraulic steering mechanism are incorporated in at least one of the roller units, the hydraulic motor being connected to the hydraulic pump to be powered thereby for driving the roller and the steering mechanism being connected to the steering control for steering the roller.
Inventors
- 👤 Ferdinand Hirn
- 👤 Manfred Edlinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:53
CPC Classifications
B; B62; B62D; B62D21/00; B62D21/18; B62D21/186; E; E01; E01C; E01C19/00; E01C19/22; E01C19/23; E01C19/26; E01C19/28; E01C19/282
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
201 words
A modular road roller comprising (a) a central frame part unit having a front end and a rear end, each end having a connecting flange and the central frame part unit having no wheels, (b) a main drive means including a hydraulic pump carried by the central frame part unit, (c) steering control means carried by the central frame part unit, (d) a first replaceable roller unit including a frame part having a connecting flange detachably mounted on the connecting flange of the central frame part unit at the front end thereof and comprising a front roller, (e) a second replaceable roller unit including a frame part having a connecting flange detachably mounted on the connecting flange of the central frame part unit at the rear end thereof and comprising a rear roller, (f) a hydraulic motor incorporated in at least one of the roller units, the hydraulic motor being connected to the hydraulic pump to be powered thereby for driving the roller of the one unit, and (g) a hydraulic steering means incorporated in at least one of the roller units, the steering means being operatively connected to the steering control means for steering the roller of the one unit.
Claim 2
Dependent Claim
201 words
A modular road roller comprising (a) a central frame part unit having a front end and a rear end, each end having a connecting flange and the central frame part unit having no wheels, (b) a main drive means including a hydraulic pump carried by the central frame part unit, (c) steering control means carried by the central frame part unit, (d) a first replaceable roller unit including a frame part having a connecting flange detachably mounted on the connecting flange of the central frame part unit at the front end thereof and comprising a front roller, (e) a second replaceable roller unit including a frame part having a connecting flange detachably mounted on the connecting flange of the central frame part unit at the rear end thereof and comprising a rear roller, (f) a hydraulic motor incorporated in at least one of the roller units, the hydraulic motor being connected to the hydraulic pump to be powered thereby for driving the roller of the one unit, and (g) a hydraulic steering means incorporated in at least one of the roller units, the steering means being operatively connected to the steering control means for steering the roller of the one unit.
Claim 3
Dependent Claim
29 words
The modular road roller of claim 1, wherein each of the roller units incorporates a hydraulic motor connected to the hydraulic pump for driving the front and rear rollers.
Claim 4
Dependent Claim
25 words
The modular road roller of claim 1, wherein each of the roller units incorporates a hydraulic steering means for steering the front and rear rollers.
References Cited (Backward Citations)
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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) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |