| 摘要 |
PCT No. PCT/GB91/00677 Sec. 371 Date Dec. 18, 1992 Sec. 102(e) Date Dec. 18, 1992 PCT Filed Apr. 29, 1991 PCT Pub. No. WO91/16993 PCT Pub. Date Nov. 14, 1991.A dispensing device is described which is a pump for dispensing accurately metered amount of fluids in the form of a spray. The device has a piston sliding in a cylinder. A fluid inlet to the cylinder is normally closed off by a ball valve and, when open, communicates with an outlet passage leading to a swirl chamber and outlet nozzle. Cooperating first and second cam surfaces are provided on parts fixed to the cylinder and piston respectively so that relative rotational movement of the cam surfaces causes the piston to slide in the cylinder, the stroke being fixed by the profiles of the cam surfaces.
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