초록 ▼

A pump which will atomize a liquid without dribble is formed of a pump body having a pump chamber with a throat at the bottom thereof; a pump stem and piston assembly disposed in the chamber for reciprocal motion therein, an axial bore being formed through the bottom of said piston and stem terminat

A pump which will atomize a liquid without dribble is formed of a pump body having a pump chamber with a throat at the bottom thereof; a pump stem and piston assembly disposed in the chamber for reciprocal motion therein, an axial bore being formed through the bottom of said piston and stem terminating in an axial outlet port; a valve member having a top section sealing against said axial port and a bottom section passing through and sealing said throat after the initial operation when said pump is operated; and a spring biasing said valve member upward. The sealing area at the axial port is selected so as to be less than the sealing area at the throat at the bottom of the chamber whereby when a predetermined pressure is reached within the pump chamber the net force exerted on the valve member acts against the spring to open the axial port to the stem causing material to be dispensed at the predetermined pressure without dribbling.

대표청구항 ▼

An improved pump for use with a container of liquid material for dispensing and atomizing the liquid material without dribble comprising: (a) means defining a pump chamber of substantially fixed volume having an inlet, said pump chamber having an opening at the inner end thereof and being of essenti

An improved pump for use with a container of liquid material for dispensing and atomizing the liquid material without dribble comprising: (a) means defining a pump chamber of substantially fixed volume having an inlet, said pump chamber having an opening at the inner end thereof and being of essentially constant inner diameter; (b) valving means disposed at said inlet for preventing a back flow from said pump chamber; (c) a pump stem having a piston on the end thereof disposed for reciprocal motion in said pump chamber; (d) said pump stem having a passageway therethrough with a dispensing outlet at the outer end of said passageway and an axial inlet port located inwardly thereof; (e) a rigid valve member made of plastic having a first end portion cooperating with said axial inlet port to close off said port and a second end portion of a predetermined cross-sectional sealing area, the axial length of said second end portion of predetermined cross-sectional area being at least equal to the range of movement of said pump stem over which dispensing occurs; (f) a plastic annular member having a flexible sealing surface inserted in said pump chamber at the inner end thereof, forming a throat at said inner end of said chamber for guiding said second end portion, said second portion cooperating with said throat to form means sealing the bottom of said pump chamber with a surface to surface seal at said throat as said pump is operated by depressing said pump stem to prevent any flow from said pump chamber through said throat when said pump is dispensing; (g) means to retain said annular member in place; (h) means for supplying liquid in a container to said valving means; (i) means biasing said valve member outwardly so that the first end portion thereof closes off said inlet port, and thereby also biasing said pump stem outwardly; (j) means for venting said pump; (k) an annular flange on the outward portion of said means defining a pump chamber; (l) a mounting cup containing a least two detent portions, said flange being retained in said mounting cup by said detent portions; (m) a collar having an annular flange extending from an intermediate point on its side wall so as to form an upper collar portion above said flange and a lower collar portion below said flange, said upper portion inserted through an opening in said mounting cup and said lower portion sealing against the top of said piston, said collar frictionally engaging said stem when said stem in in an unoperated position, with said valving means permitting communication into said pump chamber, to thereby prevent spillage of the liquid stored therein; and (n) the cross-sectional area closed off at said inlet port being smaller than the cross-sectional area of said second end portion of said valve member at the point where it is sealingly guided, whereby, as said pump is operated by pressing said pump stem, the pressure in the pump chamber is increased until, at a predetermined pressure, said biasing is overcome and said valve member is moved away from said pump stem to open said inlet port and permit pressurized material to be discharged through said passageway and dispensing outlet.