Pneumatic telescopic mast

A pneumatic telescoping mast, comprising a plurality of telescopically-coupled sealing tubes, the telescopically-coupled sealing tubes being operable to switch from a retracted configuration to an extended configuration, and vice versa, wherein actuation of the telescopically-coupled sealing tubes occurs by introducing pressurized air into the pneumatic telescoping mast, tube locking means suitable for locking the telescopically-coupled sealing tubes in the extended configuration by interference or friction even in absence of the pressurized air in the pneumatic telescoping mast, wherein the tube locking means comprise at least one safety device configured to keep the tube locking means in a locked position, the at least one safety device being deactivatable to allow the tube locking means to switch to a released position only when air in the pneumatic telescoping mast reaches a preset pressure threshold, wherein, when the air inside the pneumatic telescoping mast reaches the preset pressure threshold, a manual control member operatively connected to at least one latch becomes operable, and wherein the at least one safety device is operable by the pressurized air in the pneumatic telescoping mast,

• wherein the tube locking means comprise at least one latch radially movable between an inactive retracted position and an active advanced position, and wherein the at least one latch engages a latch pocket formed in a tube of the plurality of telescopically-coupled sealing tubes having a smaller diameter than that of the tube of the plurality of telescopically-coupled sealing tubes supporting the latch, and
• wherein movement of the at least one latch is caused by actuation of the manual control member operatively connected to the at least one latch, and wherein the at least one safety device comprises a single acting cylinder normally biased by at least one elastic element to prevent actuation of the manual control member and operable by the pressurized air in the pneumatic telescoping mast to be disengaged from the manual control member.