mât télescopique

Désignations

Codes : pays ou zone où la désignation a cours (CH, FR, DE, EU = Union européenne, INT = usage international). Une désignation barrée est déconseillée.

Définitions

anglais

A portable mast that is capable of being erected as a unit, usually by means of a tackle that hoists the wire line but sometimes hydraulic pistons. Generally the upper section of a telescoping derrick is nested (telescoped) inside the lower section of the structure and raised to full height by the wire line or by hydraulic means after it is in vertical position.