Portable device for projecting measured quantities of a fluid substance by means of a puff of compressed air

A device for projecting measured quantities of a fluid substance by means of a puff of compressed air, said device comprising:

• a body (1) having an ejection channel (4);
• an actuator member (2) displaceable relative to the body (1) between a rest position and an actuated position;
• a resilient return member (19) for the actuator member, urging the actuator member (2) towards its rest position;
• a supply (3) of said substance;
• feed means (5, 6) adapted to displace a measured quantity of said substance from the supply (3) into the ejection channel (4) when the actuator member (2) is displaced from its rest position to its actuated position;
• and
• an air pump (7) having a pump chamber (8) provided with a displaceable wall (9) secured to the actuator member (2) and adapted to compress the pump chamber (2) when the actuator member is displaced from its rest position to its actuated position, said pump chamber (8) having an inlet valve (10, 11) which communicates with the atmosphere, and an outlet valve (12, 13, 14) which communicates with the ejection channel (4), the outlet valve being constituted by a shutter member (12) which co-operates with an outlet opening (14), said shutter member (12) isolating the outlet opening (14) from the pump chamber (8) so long as the actuator member (2) is not in the immediate vicinity of its actuated position, said shutter member (12) opening communication between the pump chamber (8) and the outlet opening (14) when the actuator member (2) is in the immediate vicinity of its actuated position;
• the device being characterized in that the outlet valve is constituted by a valve piston (12) constrained to move with the actuator member (2) and sliding in sealed manner in a valve cylinder (13) having a top end (13a), said cylinder having a lateral outlet orifice (14) which communicates with the ejection channel (4), said valve cylinder having its top end in communication with the pump chamber (8), said lateral outlet orifice being positioned sufficiently far from said top end of the valve cylinder for the valve piston (12) to isolate the lateral outlet orifice (14) from the pump chamber so long as the actuator member (2) is not in the immediate vicinity of its actuated position.