Fluid injector
AssigneeColorflo Limited
InventorHarold F. Farrow
Life of this patent
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Abstract
A fluid injector unit, functioning as a pump-type injector unit through cooperation between an upper and lower press platen, being easily disassembled into a minimum number of parts for cleaning. Disengagement of a unitary assembly comprising a piston collar for supporting a main piston through biasing means therefor from a housing member containing a pump chamber results in easy access to those parts requiring cleaning without disassembly of parts external to fluid passages which do not require cleaning.
Claims7
A fluid injector unit for delivering a charge of fluid under pressure onto a substrate comprising
- a housing having a bore therein defining a fluid chamber and an outlet passage in fluid communication with said fluid chamber,
- a unitary assembly means including a main piston slidably engagable with the wall of said bore of said housing, a cylindrical collar for releasably engaging said housing, and biasing means interposed between said cylindrical collar and said main piston,
- said cylindrical collar having an externally threaded surface for threaded engagement with corresponding threads on an upper portion of said bore in said housing, an annular laterally-extending flange at the upper portion of said collar for contact with an upper surface of said housing, and an inner bore within said collar for guiding reciprocal movement therethrough of said main piston, and
- an auxiliary piston slidably engagable in an inner bore within said main piston and having an inlet valve for permitting flow of fluid into said fluid chamber and an outlet valve for controlling flow of fluid into said outlet passage from said fluid chamber,
- said unitary assembly means being removable from said housing as a unit without disassembly of said biasing means from said main piston or said cylindrical collar.
A fluid injector unit for delivering a charge of fluid under pressure onto a substrate comprising
- a housing having a bore therein defining a fluid chamber and outlet passage in fluid communication with said fluid chamber,
- a unitary assembly means including a main piston slidably engagable with the wall of said bore of said housing, a cylindrical collar for releasably engaging said housing, and biasing means interposed between said cylindrical collar and said main piston,
- said cylindrical collar having external threads for threaded engagement with corresponding threads on an upper portion of said bore in said housing to removably secure said unitary assembly to said housing, and an inner bore within said collar for guiding reciprocal movement therethrough of said main piston, and
- an auxiliary piston slidably engagable in an inner bore within said main piston and having an inlet valve for permitting flow of fluid into said fluid chamber and an outlet valve for controlling flow of fluid into said outlet passage from said fluid chamber,
- said unitary assembly means thereby being removable from said housing as a unit while maintaining said biasing means interposed between said main piston and said cylindrical collar.
Dependencies are inferred from the claim text.