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(11) | EP 1 310 305 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Trigger type liquid discharge device |
| (57) A trigger type liquid discharge device comprising a container, a pump unit having
a cylinder and a piston, a discharge pipe (F) having a discharge aperture (405), and
a trigger (102) for reciprocating the piston. Liquid drawn up from the container is
discharged through the discharge aperture by movement of the piston to a stroke end.
A liquid guide (403) is arranged in a liquid flow path (407) disposed upstream relative
to the discharge aperture (405). The liquid guide (403) comprises a valve body (410)
for closing the liquid flow path (407), a pressure bearing sleeve (411) formed integrally
with the valve body (410), a guide sleeve (417) connecting the valve body (410) and
the pressure bearing sleeve (411) through an opening (420). The guide sleeve (417)
of the liquid guide (403) is inserted into the inside of a guide sleeve (418) of a
spin element (404). The valve body (410) is urged by a spring (413) between the guide
sleeve (417) and a guide sleeve (418) to close the liquid flow path (407). The pressure
bearing sleeve (411) has a pressure bearing surface (414) facing the upstream side
of the liquid flow path (407) for bearing the liquid pressure. An area of the said
pressure bearing surface (414) is so selected that a force generated by a proper liquid
discharge pressure that is applied to said pressure bearing surface (411) is greater
than the sum of a resilient force of the spring member (413) and a force applied to
the pressure bearing surface (414) and directed to the downstream side of the liquid
flow path (407). |