Intermittent pneumatic buzzer

A system for lifting vehicles off the ground comprising at least one vehicle lift, connected to a relative pneumohydraulic pump, and at least one acoustic signalling device comprising:

• an oscillator arranged to transform a feed pneumatic flow in an intermittent pneumatic flow, said oscillator comprising:
• an inlet port arranged to be connected to a pneumatic line of said pneumohydraulic pump of said vehicle lift to supply said oscillator with said feed pneumatic flow;
• an outlet port arranged to expel said intermittent pneumatic flow;
• an acoustic signaller connected to said oscillator by said outlet port said acoustic signaller arranged to compress said intermittent pneumatic flow for producing an intermittent acoustic signal.

A system for lifting vehicles off the ground comprising at least one vehicle lift, connected to a relative pneumohydraulic pump, said pneumohydraulic pump comprising:

• a compression chamber;
• a piston arranged to carry out a forward stroke and a return stroke in said compression chamber;
• an inverter arranged, once ended said forward stroke of said piston, to unload said compression chamber to allow said piston to carry out said return stroke;
• said system also comprising an acoustic signaller connected to said compression chamber of said pneumohydraulic pump, said acoustic signaller arranged to compress an intermittent pneumatic flow coming from said compression chamber for producing an intermittent acoustic signal.