Abstract: A pump dispenser has a body consisting of two hollow cylinders of dissimilar diameters, the diameters of the two cylinders defining an outer boundary of a pump chamber. A piston defines the inner boundary of the pump chamber. The piston also defines a slidable seal with both body diameters and is provided with an aperture which can function as an outlet port on a downstroke and an inlet port port on an upstroke. A stem cooperates with the piston to form a discharge path which can be opened or closed and also cooperates with the aperture to define the ports. The stem is biased to close the discharge port when the dispenser is in rest position.

Abstract: A finger actuated pump dispenser employs a first upper hollow vertical cylinder with a first diameter and open upper and lower ends and a second lower hollow vertical cylinder with a second and smaller diameter and a closed lower end with a central opening. The lower end of the first cylinder is joined to an open upper end of the second cylinder. The inner wall of the second cylinder has a horizontal annular recess. A first vertical hollow piston has openings in top and bottom ends and extends slidably above and within the cylinders. The first piston has an enlargement intermediate upper and lower ends peripherally engaging and defining a first unbroken seal with the inner surface of the first cylinder. The first piston has a lower section extending downward from the enlargement to its lower end, the lower section having an outer diameter slightly less than the diameter of the second cylinder.

Abstract: A lower end of a first hollow cylinder is connected to an upper end of a second hollow cylinder. A first outer hollow stem has an intermediately disposed first external enlargement disposed within the first cylinder. A hollow vertical main piston is vertically slidable within the first cylinder. A second inner stem extends upwardly through the main piston and through a bore in the first stem. A space between an upper section of the second stem and the first stem defines a vertical fluid discharge path. An upper end of an integral lower vertical section of the second stem engages the lower end of the main piston so that a horizontal channel extends between the lower section and the lower end of the main piston and connects the region between the lower section and the inner wall of the first cylinder to the fluid discharge path. A fluid discharge port is formed between the upper ends of the first section and the inner stem.

Abstract: A hand powered rotatable toothbrush is characterized by elements, such as tufts of brush bristles, positionally fixed to the brush head to frictionally engage tooth surfaces and thereby positionally stabilize the brush head so that a distal portion of the brush handle can be longitudinally reciprocated relative to the brush head. One or more rotatable brush members mounted on the brush head are operatively connected to the distal handle portion, as by a rack and pinion, to cause the brush members to be rotated in response to longitudinal handle reciprocation. In one embodiment the rotatable brush member cyclically rotates in opposite directions in response to back and forth linear motion of the handle. In another embodiment the rotation of the brush member is in the same direction, irrespective of the direction in which the handle moves.

Abstract: The lower end of a first hollow vertical cylinder curves inwardly to merge with the upper end of a lower second cylinder. A hollow vertical piston extends through a top opening of the first cylinder into the first cylinder and is vertically movable therein with a lower end of the piston slidably engaging the inner surface of the first cylinder. A vertical member has upper and lower integral sections, the lower section being enlarged with respect to the upper portion, the upper section being engagable or disengagable with the upper end of the piston to define a first closed or open port therewith. A third vertical hollow cylinder has a lower end in continuous fluid sealing engagement with the inner surface of the second cylinder. An upper end of the third cylinder is engagable or disengagable with the lower section to define a second closed or open port therewith. The first port is open when the second port is closed and vice versa.

Abstract: The lower end of a first hollow vertical cylinder is connected to the upper end of a second vertical hollow cylinder of smaller diameter. A first outer hollow stem open at its ends has an intermediately disposed first external enlargement disposed below the top open end of the first cylinder. A hollow vertical main piston is vertically slidable within the first cylinder. A second inner stem has an upper vertical section which extends upwardly through the main piston and through a bore in the first stem. A vertical fluid discharge path is formed between the upper section and the first stem. An integral lower vertical section of the second stem engages the lower end of the main piston. A fluid discharge port is formed between the first section and the stem. A vertical inner piston is slidable in the second cylinder. A first spring normally biases the stems together, closing the discharge port. A second spring causes the discharge port to open during a selected point on the downstroke.

Abstract: An atomizing fluid dispenser has a pump chamber defined by a hollow vertical region defined by adjacent portions of interconnected upper and lower cylinders, a vertical member and a piston. The chamber has a first fluid entry port and a second fluid discharge port. The second port is opened and the first port is closed during a downstroke and the first port is opened and the second port is closed during an upstroke. Both ports are closed during periods of non use.

Abstract: An atomizing dispenser employs a vertical hollow elongated body with upper and lower ends and an orifice centered on the body axis and disposed between the upper and lower body ends. A hollow sleeve is disposed within the body with a relatively large open lower end and a relatively small open upper end and is vertically slidable. A vertically movable member has a lower enlarged section disposed within the sleeve and an upper section extending through the upper end of the sleeve. A vertically movable hollow piston has upper and lower open ends. The upper section of the member extends through the lower end of the piston into the piston interior; the lower end of the piston slidably engaging the inner surface of the upper body end.

Abstract: A finger operated pump dispenser employing interconnected upper and lower cylinders, first and second pistons disposed in the upper and lower cylinders, a hollow sleeve, and a stem which extends upwardly through the first piston into the sleeve. The first cylinder, the stem and the two pistons define a pump chamber which is filled with fluid. When the dispenser is actuated, fluid is displaced from the chamber into the second cylinder and a port is opened. The port can be made to open at the moment that all of the fluid is displaced into the second cylinder. Once the port is opened, the fluid is discharged and further piston movement enables fluid to be pulled upward out of the container secured to the dispenser via an opening formed between the second piston, stem and inner wall of the second cylinder refilling the chamber. The motions of pistons, stem and sleeve are so controlled that accurate dosage is produced independently of the method of actuation.

Abstract: A vertical hollow body has a first upper hollow vertical cylinder and a second lower hollow outer vertical cylinder. A third inner hollow vertical cylinder is disposed concentrically within and spaced from the second cylinder. The lower ends of the first and second cylinders are joined. The upper end of the third cylinder has an aperture. A hollow piston is vertically movable within the first cylinder. A vertical member has an upper section extending into the piston interior, an enlarged middle section and a fourth vertical hollow cylinder as an enlarged lower section. The fourth cylinder has an inner shoulder at its upper end. A spring is disposed between and bears against the joined lower ends and the shoulder. A pump chamber is defined by a hollow vertical region bounded by adjacent portions of the body, member and piston and has a first fluid entry port and a second fluid discharge port.

Abstract: 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.