An extensible bar with a simplified locking system

The invention refers to an extensible bar for tractors, comprised by a bar (1) and a sleeve (2) that slide over one another and are kept together by a pin (9) and including a locking system (3). According to the invention, the locking system is comprised by a latch (7) that prevents the sliding movement between the sleeve (2) and the bar (1) when it is positioned within the housings of the bar and sleeve when they are aligned, by means of the actuation of a wire spring (6). The assembly is unlocked when the latch (7) is manually pulled out of the housings by means of a pull handle (8) directly attached to the latch. The locking system can be blocked to facilitate the detachment of the accessory, by turning the latch (7) about the wire spring (6), to prevent the latch (7) from engaging the housing. All these three functions: locking, unlocking and blocking of the system are performed by an assembly of only three parts (6, 7 and 8) of low production cost.