A cartridge tensioner (10) for drive transmission belts and chains comprises a cylinder (12) with a cylinder bore, a piston (14) slidably received in the cylinder bore and provided with a piston bore (40), a vent device (16) housed in the piston bore and comprising an end part and a stem integral with each other, a pressure spring (18) acting between a shoulder of the cylinder and the vent device, and a retaining device (20), accessible from the outside of the cylinder. The retaining device, in a position engaged with the stem of the vent device, retains the vent device preventing the action of the spring on the piston, and, in a position of disengagement from the stem of the vent device, allows the spring to bias the device against the piston and to act consequently on the piston.

REFERENCE TO RELATED APPLICATIONS

This application claims an invention which was disclosed in EPC application number 02425131.6, filed Mar. 7, 2002, entitled "HYDRAULIC TENSIONER OF THE HOLLOW PISTON TYPE WITH A SCREW-TYPE RETAINING DEVICE". The benefit under 35 USC.sctn.119(a) of the EPC application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.

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