CLARK MASTS FOR MILITARY USERS
Series 90 MECHANICALLY
EXTENDED
THE LIFTER, 300 Kg UP TO 40 METRES
This mast was developed from the
Type 73 to meet the need to lift 300 kg vertical antenna loads to
40 metres with great stability and safety. It uses 4 legged
erection gear and guys at 90 degrees. The Series' great rigidity
typically enables grid parabola antennas up to 3 metres in
diamater to be placed at heights up to 40 metres with the
necessary torsional stability. The guy control system retains
safety at all stages of erection and retraction. A buit-in crane
device enables heavy antennas to be mounted with minimum effort.
Once erected, all erection gear may be removed leaving a
semi-permanent mast.
ERECTION EXAMPLE: 30 Metres : 5 Persons, time to erect with
typical antenna, 2.5 hours.
The Series 90 Masts are built around a
standard mast section of 150 mm in diameter and 2 metres long.
Sections are joined together with a keyed spigot member and
secured by means of an external clamp. The joint is free of all
torsional play. The erection gear comprises a four legged mast
section guiding unit incorporating steps and a work platform. A
Crane lifts big antennas into position on the mast at ground
level. The Lifting Hoist, common to both Crane and mast erection
has a double braking system, finger controlled and automatic.
Guying is handled by guy control units on the ground near the
mast base.
TABLE OF STANDARD SERIES 90 MASTS
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