Filter screen device

Claim 1

An improved filter screen device, said device comprising, in combination: a. an elongated tubular housing having a hollow central interior, an open upstream end communicating with said interior and an enclosed end wall at the opposite downstream end, an inlet disposed at an acute angle to the main axis of said housing, intersecting said interior between said upstream and downstream ends, converging with the tubular housing in the direction of the downstream end and configured to cause liquid passing therethrough into said housing to spiral over the outer face of said screen, a first outlet extending through said end wall at said downstream end about perpendicular to said first outlet; b. a hollow elongated perforated tubular member releasably secured in said housing interior and having an open downstream end and a closed upstream end, the latter sealing said upstream end of said housing, said first outlet being in communication with the interior of said tubular member at the downstream end thereof, said tubular member having annular slots spaced longitudinally on the exterior thereof about perpendicular to the longitudinal axis thereof, and having a handle connected to the closed upstream end thereof and tabs which fit into slots in said upstream end of said housing, said tubular member being insertable into said housing and rotatable therein to lock to said housing by said tabs; c. a flexible sock type filter screen releasably disposed over the outer surface of said tubular member and spaced inwardly of said housing to define therewith an annular space with which said second outlet is in communication; d. an intermediate grid disposed between said screen and said tubular member to hold said screen away from said tubular member for improved filtration; and, e. O-rings clamping said screen to said grid, said downstream end of said housing having converging walls against which one of said O-rings resiliently abuts when said tubular member locks in said housing.