Patent US4227834A successfully refreshed from Google Patents.
US4227834A
Expired / Lapsed
US
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Block laying machine
Assignee: TERRAFIX EROSION CONTROL PRODUCTS Inc
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Filing: 1979-01-16
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Granted: 1980-10-14
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Expires: 1999-01-16
Abstract
Abstract A machine for assisting in the laying of courses of blocks to form a ground covering layer in erosion control systems has a flexible apron on which the blocks are laid, a frame attached to one side of the apron, and two spaced and independently actuable pusher bar assemblies, which can act between the frame and the blocks to position the blocks, steer the machine, and withdraw the apron from beneath the blocks.
Inventors
- 👤 Robert E. Crowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:35
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/52; E02; E02B; E02B3/00; E02B3/04; E02B3/12; E02B3/121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
A machine for laying interlocking blocks on a prepared surface comprising a thin, flexible, rectangular apron upon which successive courses of blocks may be laid extending parallel to and commencing at one marginal edge, said apron presenting a low frictional resistance to movement of the blocks over its upper surface and to movement of its lower surface over the prepared surface, a frame connected to a second marginal edge of the apron opposite said one marginal edge, at least two laterally spaced pusher bars overlying the apron and extending substantially parallel to said marginal edges, each pusher bar being engageable with a different part of the same course of blocks, a retractable actuator acting between each pusher bar and the frame and operable so as to push its associated bar and the frame apart, and means for operating each of said actuators independently.
Claim 2
Dependent Claim
143 words
A machine for laying interlocking blocks on a prepared surface comprising a thin, flexible, rectangular apron upon which successive courses of blocks may be laid extending parallel to and commencing at one marginal edge, said apron presenting a low frictional resistance to movement of the blocks over its upper surface and to movement of its lower surface over the prepared surface, a frame connected to a second marginal edge of the apron opposite said one marginal edge, at least two laterally spaced pusher bars overlying the apron and extending substantially parallel to said marginal edges, each pusher bar being engageable with a different part of the same course of blocks, a retractable actuator acting between each pusher bar and the frame and operable so as to push its associated bar and the frame apart, and means for operating each of said actuators independently.
Claim 3
Dependent Claim
16 words
A machine according to claim 1, wherein the actuators are independently controlled double acting pneumatic rams.
Claim 4
Dependent Claim
29 words
A machine according to claim 1 or 2, wherein the actuators are articulated to the frame for vertical pivotal movement, and to the pusher bars for horizontal pivotal movement.
Claim 5
Dependent Claim
14 words
A machine according to claim 3, wherein the apron is articulated to the frame.
Claim 6
Dependent Claim
15 words
A machine according to claim 4, wherein the apron is a flexible stainless steel sheet.
Claim 7
Dependent Claim
16 words
A machine according to claim 1, wherein the actuators and pusher bars are two in number.
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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |