Patent US3937026A successfully refreshed from Google Patents.
US3937026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lining apparatus for the protection of trenches
Assignee: Individual
•
Filing: 1974-09-24
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Granted: 1976-02-10
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Expires: 1994-09-24
Abstract
Abstract This disclosure relates to a lining apparatus for the protection of trenches, which lining apparatus includes lining plates which are insertable in pairs in vertical sliding carriers on the side of the trench and are capable of being pressed against the wall of the trench by expanding devices, each lining plate including two component plates connected together loosely and detachably and the component plates being guided together in the sliding carriers with the outer dimension of the component plates being approximately equal to those of a unitary lining plate.
Inventors
- 👤 Josef Krings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:23
CPC Classifications
E; E02; E02D; E02D17/00; E02D17/06; E02D17/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
Lining apparatus for the protection of trenches comprising vertical sliding carriers and lining plates which are insertable in pairs in said vertical sliding carriers on the side of a trench and capable of being pressed against walls of a trench by expanding devices, each said lining plate comprising two component plates assembled together loosely and detachably, said component plates being guided together in said sliding carriers, and one of said component plates has a bracket along its lower edge which engages under the lower edge of the other of said plates to generally maintain a vertically adjacent relationship between said two component plates.
Claim 2
Dependent Claim
103 words
Lining apparatus for the protection of trenches comprising vertical sliding carriers and lining plates which are insertable in pairs in said vertical sliding carriers on the side of a trench and capable of being pressed against walls of a trench by expanding devices, each said lining plate comprising two component plates assembled together loosely and detachably, said component plates being guided together in said sliding carriers, and one of said component plates has a bracket along its lower edge which engages under the lower edge of the other of said plates to generally maintain a vertically adjacent relationship between said two component plates.
Claim 3
Dependent Claim
38 words
Lining apparatus according to claim 1 wherein a pointed plate foot part forms an extension of said component plates and is connected to said bracket with a lower edge of other of said component plates being seatable thereon.
Claim 4
Dependent Claim
16 words
Lining apparatus according to claim 1 wherein friction reducing means are disposed between said component plates.
Claim 5
Dependent Claim
23 words
Lining apparatus according claim 3 wherein said friction reducing means comprise perpendicular sliding bars connected to at least one of said component plates.
Claim 6
Dependent Claim
36 words
Lining apparatus according to claim 4 wherein both said component plates are connected to respective ones of said sliding bars, and there are guide bars respectively guided in one another and connected to said component plates.
Claim 7
Dependent Claim
41 words
Lining apparatus according to claim 3 wherein said friction reducing means is in the form of at least that face of at least one of said component plates facing the other of said component plate being coated with a plastics material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |