EP 0000793 B1 19810211 - TRANSPORTABLE MAST, ESPECIALLY FOR DIRECTIONAL BROADCAST INSTALLATIONS
Title (en)
TRANSPORTABLE MAST, ESPECIALLY FOR DIRECTIONAL BROADCAST INSTALLATIONS
Publication
Application
Priority
CH 956677 A 19770804
Abstract (en)
[origin: US4212015A] 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.
IPC 1-7
IPC 8 full level
E04H 12/34 (2006.01); H01Q 1/12 (2006.01)
CPC (source: EP US)
E04H 12/34 (2013.01 - EP US); H01Q 1/1235 (2013.01 - EP US)
Designated contracting state (EPC)
FR GB NL
DOCDB simple family (publication)
EP 0000793 A1 19790221; EP 0000793 B1 19810211; CA 1105612 A 19810721; CH 616984 A5 19800430; DE 2738317 A1 19790215; DE 7726367 U1 19790510; IT 1097412 B 19850831; IT 7826106 A0 19780726; US 4212015 A 19800708
DOCDB simple family (application)
EP 78200068 A 19780629; CA 308614 A 19780802; CH 956677 A 19770804; DE 2738317 A 19770825; DE 7726367 U 19770825; IT 2610678 A 19780726; US 93000778 A 19780801