Portable mast for radio link systems
US4212015A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1978 |
| Grant date | Jul 8, 1980 |
| Priority date | — |
| Expiry date | Aug 1, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H12/34
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A portable radio link system mast, particularly for use in the field, employing mast tube elements which are lifted, one after the other, by means of a lifting device installed in the head of the stand and, after a certain height is reached, are connected with always the next mast tube element. The lifting device consists of three frictionally self-locking pawls arranged on top of each other, a carrying pawl, a lowering pawl and a lifting pawl, which permit a slipless lifting, lowering and locking of the mast tube elements in connection with springs. A cardigan cam lever with a feeler stud draws attention to a wrong connection of the mast tube elements, and a mast tube element in the range of the lifting device can only be pushed out of the head of the stand after a correct contact is established with the following mast tube element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.