GB595209A - Improvements in and relating to safety devices for preventing over-luffing in jib cranes and like apparatus - Google Patents
Improvements in and relating to safety devices for preventing over-luffing in jib cranes and like apparatusInfo
- Publication number
- GB595209A GB595209A GB843445A GB843445A GB595209A GB 595209 A GB595209 A GB 595209A GB 843445 A GB843445 A GB 843445A GB 843445 A GB843445 A GB 843445A GB 595209 A GB595209 A GB 595209A
- Authority
- GB
- United Kingdom
- Prior art keywords
- jib
- luffing
- control
- lever
- cranes
- 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
- B66C23/88—Safety gear
- B66C23/92—Snubbers or dashpots for preventing backwards swinging of jibs, e.g. in the event of cable or tackle breakage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
595,209. Jib cranes; end stop-gears. ANGLO-IRANIAN OIL CO., Ltd., and MILLS, E. E. April 5, 1945, No. 8434. f Classes 78(iv) and 78(v)] [Also in Group XXXVII] A device applied to the luffing unit of jib cranes or like apparatus for preventing overluffing comprises two control units operated respectively by the luffing control member when this is set into the up position and by the jib when this reaches its inner limiting position, the arrangement being, such that when both control units are operated the luffing unit is rendered ineffective for further upward movement of the jib. In the embodiment shown in which luffing of the jib is effected by a petrol motor controlled by a hand-lever b, the control device comprises two switches c, d, [see Group XXXVII], which are arranged in a 'circuit for earthing the magneto through the frame of the crane and which are adapted to be closed by the lever when this is moved to the " up " position and by the jib when it reaches its upward limiting position, respectively. When the luffing unit is an electric motor closure of the two switches serves to interrupt the supply to the motor and if necessary operate a brake. In the case of a Diesel or like engine the control circuit may serve to operate a solenoid to disengage a driving clutch.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB595209A true GB595209A (en) | 1947-11-28 |
Family
ID=1629334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB843445A Expired GB595209A (en) | 1945-04-05 | Improvements in and relating to safety devices for preventing over-luffing in jib cranes and like apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB595209A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2840244A (en) * | 1953-06-22 | 1958-06-24 | Jr Thomas W Thomas | Boom stop ram |
| GB2314550A (en) * | 1996-06-27 | 1998-01-07 | Seatrax Inc | Hdraulic boom stop for a crane |
| CN102730581A (en) * | 2012-06-29 | 2012-10-17 | 上海三一科技有限公司 | Main luffing mast rope collection operating device and crane including same |
-
1945
- 1945-04-05 GB GB843445A patent/GB595209A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2840244A (en) * | 1953-06-22 | 1958-06-24 | Jr Thomas W Thomas | Boom stop ram |
| GB2314550A (en) * | 1996-06-27 | 1998-01-07 | Seatrax Inc | Hdraulic boom stop for a crane |
| GB2314550B (en) * | 1996-06-27 | 2000-06-28 | Seatrax Inc | Hydraulic boom stop |
| CN102730581A (en) * | 2012-06-29 | 2012-10-17 | 上海三一科技有限公司 | Main luffing mast rope collection operating device and crane including same |
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