GB1213352A - Multiple telescopic jib for a crane - Google Patents
Multiple telescopic jib for a craneInfo
- Publication number
- GB1213352A GB1213352A GB284068A GB284068A GB1213352A GB 1213352 A GB1213352 A GB 1213352A GB 284068 A GB284068 A GB 284068A GB 284068 A GB284068 A GB 284068A GB 1213352 A GB1213352 A GB 1213352A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rams
- crane
- piston
- rods
- point
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
1,213,352. Telescopic jibs. DEMAG BAUMASCHINEN G.m.b.H. 18 Jan., 1968, No. 2840/68. Headings B8B and B8H. A telescopic jib 1-4, Fig. 1, for a crane, is extended by double-acting hydraulic rams 7, 10, 13 which have their piston-rods and cylinders attached to cross-members 5, 8, 11, 14. Hydraulic fluid is supplied to the rams through the piston-rods, which are hollow, fluid passing from the point 6 through the first ram 7 to the point 9 and so on. Thus, no flexible conduits are required. The rams are arranged in staggered relationship. Fig. 3 (not shown), illustrates an hydraulic circuit with a three position slide-valve for extending and retracting the rams. Pressure limiting valves prevent the build up of pressure due to temperature increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB284068A GB1213352A (en) | 1968-01-18 | 1968-01-18 | Multiple telescopic jib for a crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB284068A GB1213352A (en) | 1968-01-18 | 1968-01-18 | Multiple telescopic jib for a crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1213352A true GB1213352A (en) | 1970-11-25 |
Family
ID=9746942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB284068A Expired GB1213352A (en) | 1968-01-18 | 1968-01-18 | Multiple telescopic jib for a crane |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1213352A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998004492A1 (en) * | 1996-07-26 | 1998-02-05 | Trimatic A/S | Telescope |
| CN102431911A (en) * | 2011-09-29 | 2012-05-02 | 中联重科股份有限公司 | Control method and control device for boom extension and retraction and engineering machinery |
-
1968
- 1968-01-18 GB GB284068A patent/GB1213352A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998004492A1 (en) * | 1996-07-26 | 1998-02-05 | Trimatic A/S | Telescope |
| CN102431911A (en) * | 2011-09-29 | 2012-05-02 | 中联重科股份有限公司 | Control method and control device for boom extension and retraction and engineering machinery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |