| Document ID (ISN) | 40971 |
| CIS number |
83-1839 |
| ISSN - Serial title |
0409-2961 - Bezopasnost' truda v promyšlennosti |
| Year |
1982 |
| Convention or series no. |
|
| Author(s) |
Levin M.M. |
| Title |
Devices to prevent crane booms from falling back over the cab |
| Original title |
Ustrojstva dlja predotvraščenija zaprokidyvanija strely krana [in Russian] |
| Bibliographic information |
Feb. 1982, No.2, p.26. Illus. |
| Abstract |
When boom-type cranes operate at angles near the vertical, wind or inertial forces (such as those resulting from loss or shifting of the load) can cause the boom to fall back over the cab. Devices presently in use have drawbacks which can be avoided by the use of the proposed device. This consists of a heavy cable which passes through a brake mounted in front of the boom, and a strain gauge attached to the boom angle sheave. When the boom approaches the vertical, the load on the boom angle sheave falls sharply. The resulting change in strain gauge output is sensed by an actuator circuit which closes the brake on the cable, thus restraining the boom. |
| Descriptors (primary) |
travel limiting devices; crane jibs; cranes |
| Descriptors (secondary) |
brakes; description of equipment |
| Document type |
D - Periodical articles |
| Subject(s) |
Other equipment and plant
|
| Broad subject area(s) |
|
| Browse category(ies) |
Cranes
|
