USD252950S - Lightweight trench box - Google Patents
Lightweight trench box Download PDFInfo
- Publication number
- USD252950S USD252950S US05/828,879 US82887977F USD252950S US D252950 S USD252950 S US D252950S US 82887977 F US82887977 F US 82887977F US D252950 S USD252950 S US D252950S
- Authority
- US
- United States
- Prior art keywords
- trench box
- lightweight
- lightweight trench
- box
- ornamental design
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Description
FIG. 1 is a side elevational view of a lightweight trench box constructed in accordance with the teachings of this invention;
FIG. 2 is a top plan view of the invention;
FIG. 3 is an end view looking from the left (as viewed in FIG. 1); and
FIG. 4 is an end view of the invention looking from the right (as viewed in FIG. 1).
Claims (1)
- The ornamental design for a lightweight trench box, as shown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/828,879 USD252950S (en) | 1977-08-29 | 1977-08-29 | Lightweight trench box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/828,879 USD252950S (en) | 1977-08-29 | 1977-08-29 | Lightweight trench box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| USD252950S true USD252950S (en) | 1979-09-18 |
Family
ID=69671494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/828,879 Expired - Lifetime USD252950S (en) | 1977-08-29 | 1977-08-29 | Lightweight trench box |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | USD252950S (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7559724B1 (en) | 2008-03-17 | 2009-07-14 | Olen Jeffrey D | Adjustable and portable trench support |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2188077A (en) | 1938-05-16 | 1940-01-23 | Thomas L Dowd | Means for sheathing excavation walls |
| US3335573A (en) | 1965-07-27 | 1967-08-15 | Allied Steel Tractor Prod Inc | Hydraulically-operated shoring apparatus with pressure safety lock |
| US4056940A (en) | 1976-10-26 | 1977-11-08 | Griswold Machine & Engineering, Inc. | Trench box height adaptor |
| US4114383A (en) | 1976-10-12 | 1978-09-19 | Efficiency Production, Inc. | Portal frame for trench box stack |
-
1977
- 1977-08-29 US US05/828,879 patent/USD252950S/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2188077A (en) | 1938-05-16 | 1940-01-23 | Thomas L Dowd | Means for sheathing excavation walls |
| US3335573A (en) | 1965-07-27 | 1967-08-15 | Allied Steel Tractor Prod Inc | Hydraulically-operated shoring apparatus with pressure safety lock |
| US4114383A (en) | 1976-10-12 | 1978-09-19 | Efficiency Production, Inc. | Portal frame for trench box stack |
| US4056940A (en) | 1976-10-26 | 1977-11-08 | Griswold Machine & Engineering, Inc. | Trench box height adaptor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7559724B1 (en) | 2008-03-17 | 2009-07-14 | Olen Jeffrey D | Adjustable and portable trench support |
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