Fluid handling – Systems – With pump
Patent
1992-11-06
1993-12-07
Chambers, A. Michael
Fluid handling
Systems
With pump
251342, 251349, 433 95, E03B 500
Patent
active
052675866
ABSTRACT:
The invention concept is a shutoff valve mechanism (40) for use in conjunction with the oral evacuator of a dental unit, said mechanism being connectable to a suction tube (14) communicating with a vacuum pump. The shutoff valve mechanism (40) comprises a valve (42, 48) by means of which an air flow (S) induced by the vacuum applied to the suction tube (14) can be switched on to effect via an evacuator tip (30) attached to the shutoff valve mechanism (40), whereby the evacuator tip can be employed for evacuating liquids and solid particles (SP) from the patient's mouth. The shutoff valve mechanism (40) further comprises non-moving elements (41, 42, 43, 44, 45, 46) permanently attached to the suction tube (14) and elements (49, 50, 51, 52, 53, 54, 55) adapted movable relative to said non-moving elements, both sets of elements incorporating a flow channel (41a, 42a, 43a, 53a).
REFERENCES:
patent: 1418592 (1922-06-01), McGee
patent: 2149584 (1939-03-01), Davis
patent: 2785016 (1957-03-01), Vollertzen et al.
patent: 3476144 (1969-11-01), Krantz
patent: 4015336 (1977-04-01), Johnson
patent: 4081176 (1978-03-01), Johnson
patent: 4215476 (1980-08-01), Armstrong
patent: 4356998 (1982-11-01), Bach
patent: 4501409 (1985-02-01), Hill
Chambers A. Michael
Planmeca Oy
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