Abstract: A removable device for attaching two mechanical parts includes a pin removably locking a first part with respect to a second part, a retainer member on the pin and a resiliently loaded tension member which collaborate to prevent the pin from coming out of its locked position; the removable device further includes at least two inclined surfaces, the general shape of which is that of a projection oriented in the axial direction of the pin, such that when the pin rotates, the retainer member runs along the inclined surfaces and the pin moves between the locked position and unlocked position against a force exerted on the pin along a longitudinal axial direction of the pin exerted by the tension member.

Abstract: The tooth and adaptor for dredging machines object of the present invention relates to a tooth or wear member which, attached to an adaptor or adaptor member, creates an assembly the purpose of which is to deepen and clean the beds of ports, rivers, channels, etc., removing therefrom sludge, stones, sand, etc., the adaptors being attached to the blades of the propellers and thus forming the cutter head of the dredging machine. The constructive features of the coupling between the tooth and the tooth bar or adaptor allow making better use of the cutting material of the tooth and a simple and quick replacement thereof in the adaptor, between other advantages.

Abstract: The removable device for attaching two mechanical parts comprises a pin removably locking a first part with respect to a second part, a retainer member associated to the pin and a resiliently loaded tension member which collaborate to prevent the pin from coming out of its lock position; it is characterized in that it further comprises at least two inclined surfaces, the general shape of which is that of a projection oriented in the axial direction of the pin, such that when the pin rotates, the retainer member runs along said inclined surfaces and the pin moves between the lock position and unlock position against the force axial to the axis of the pin exerted by said tension member. The assembly and removal of the parts is carried out in a simple manner, but the attachment during operation of the excavator is at the same time secure and reliable.