| 摘要 |
A device for leakproofing instrument-control buttons, particularly for the winding and time-setting buttons (3) of watches, comprises a sealing element (8) fitted on the casing of the instrument in order to form a leaktight seal against the button, as well as a bridge unit (7) beneath which the button projects laterally and which carries an articulated lever (1) having a cam appendage (2) for pressing the button against the sealing element in a first position and for releasing the button to permit conventional movements thereof in a second position, the upper portion of the button (3) being machined in a manner such that a compartment is formed therein for housing a small piston element (4) in an axially slidable manner, the cam appendage (2) of the articulated lever (1) acting on the piston element (4), which is urged axially outwardly by resilient means (5) so as to take up clearance created between the button (3) and the casing.
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