(57) This invention relates to farm vehicles of the telescopic lift type, equipped with
a lift arm (1) fitted with an improved drive mechanism.
The arm (1) is of the type comprising a first base section (2) fitted directly to
the chassis of a telescopic lift device, a second section (3) which slides inside
said first section (2), and a third section (4) which slides inside said second section
(3), which said arm (1) also acts as support for pressurised hydraulic pipes (14,15)
that connect a pressurised oil generator on board said device to one or more hydraulic
jacks (6,13) fitted at the end of said arm (1), the reciprocal movements of said three
sections (2,3,4) being controlled by a hydraulic jack (6) which acts directly between
said first and second sections (2,3), a system being provided with flexible elements
(10,11) stretched between said first and third sections (2,3) and tautened by pulleys
integral with said second section, which effects the extension and retraction of said
third section (4), and is characterised in that it includes:
• a first flexible element (10) which connects a first part (7), integral with said
first base section (2), to a part (4a) integral with said third section (4), said
first flexible element (10) being tautened by a first pulley (8) integral with said
second section (3);
• a second flexible element (11) which connects a second part (12) integral with said
first base section (2) to said part (4a), which is integral with said third section
(4), said second flexible element (11) being tautened by a second pulley (9) integral
with said second section (3):
• a first pipe (14) which follows the same route as said first flexible element (10)
from said first part (7), integral with said first section (2), to said part (4a)
of said third section (4);
• a second pipe (15) which connects said part (4a), integral with said third section
(4), to said at least one jack present on the end of said arm (1);
said first and second flexible elements (10,11), said first and second pulleys (8,9)
and said first and second pipes (14,15) being wholly contained inside said first,
second and third sections (2,3,4).
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