Patent ID: 9562551
Date: 2017-02-07
CPC Classifications: B23Q,B25B,F16B,Y10T

Claim:
1. A locking device for a mechanical piece comprising at least one hollow body that forms a sliding seat, a movable stem that is accommodated slidingly partially within said sliding seat and radial expansion means which are interposed between said hollow body and said movable stem and are adapted to mutually lock said hollow body and said movable stem, said movable stem protruding partially from said hollow body with said hollow body and said movable stem jointly connectable, at their free ends, by way of means for connection, respectively, to said mechanical piece or a fixed part of a machine with which said mechanical piece is to be processed, wherein said radial expansion means comprise an elastically deformable tubular element, which is fitted slidingly on said movable stem and is jointly accommodated with play within said sliding seat so as to form, between the outside wall of said tubular element and the inside wall of said sliding seat, at least one empty interspace, which is closed and can be connected functionally to a system for dispensing a pressurized fluid in order to introduce said pressurized fluid into said at least one interspace, so as to deform elastically said tubular element and lock the translational motions of said movable stem with respect to said hollow body and vice versa, as a consequence of the increase in pressure in said at least one interspace.