 Pulse damper |
| I claim: 1. In a liquid chromatography system comprising a reciprocating pump, a chromatographic ... |
|
| Hydraulic slide valve |
| I claim: 1. A hydraulic control valve, comprising, a housing having a cylindrically shaped bore, ... |
|
| Hydroblasting spray gun having an on/off safety switch system |
| The present invention is an improved hydroblasting spray gun having a base frame, a first ... |
|
| Balanced airflow control valve for helicopter blade |
| Briefly, the present invention is a valve for a CCR blade which extends the length of the blade. T... |
|
| Gas valve |
| The present invention provides attachment of an elastomeric poppet to a bi-metal actuator arm in an ... |
|
| Mechanically actuated slot for circulation control rotor |
| The valving device controlling air flow distribution to the rotor blades in a circulation control ... |
|
| Thermally actuated valve with ambient temperature compensation |
| The present invention employs a resilient poppet mounted on the end of a cantilevered bimetal blade ... |
|
| Pressurized modular system for space applications |
| OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1, a modular system 8 in accordance with the ... |
|
| Method and apparatus for controlling the mixing of two fluids |
| According to a broad aspect of the present invention, there is provided a method of controlling the ... |
|
| Piezoelectric low-pressure fuel injector |
| The general object of the present invention is to eliminate the aforementioned disadvantages. The ... |
|
|
Liquid dispensing pump
| Details |
Inventors: Corsette, Douglas F.;
Assignee:
Primary Examiner: Rolla; Joseph J.
Assistant Examiner: Noland; Kenneth
Attorney, Agent or Firm: Watson, Cole, Grindle & Watson
A liquid dispensing pump in the form of a trigger sprayer includes a thimble-shaped valving element containing inlet and outlet valves, and located within a cylindrical portion of the pump body. In one embodiment, a pressure accumulation chamber is defined between the pump body and the valving element, and a pump piston operates within the valving element and defines therewith a pump chamber in open communication with the accumulation chamber via spaced, flexible and extendable straps which interconnect the inlet and outlet valves for permitting a portion of the valving element to move axially into a discharge valve opening position. Vent valving is effected by either the pump piston or the valving element during inward reciprocation movement of the piston. In another embodiment, the sprayer is converted into a throttle pump by the provision of a pump piston which operates within the cylindrical portion of the pump body. |
|
DETAILED DESCRIPTION As an alternative construction over the aforementioned patent, the pump according to the invention includes a thimble-shaped element which includes inlet and outlet check valves and defines a pump cylinder in which a piston operates, the thimble-shaped element being of a simple construction which is simple to manufacture and assemble, and which renders the pump easy to operate while at the same time effects a dripless product discharge.
A container vent is located in the pump body and may be controlled by a flexible lip seal on the piston when it engages means provided on the pump body for opening a vent passage in the inward movement of the piston.
Otherwise, the container vent may be controlled by a flange provided on the piston which uncovers the vent in the inward movement the piston.
Alternatively, the container vent may be controlled by the thimble-shaped element itself, a portion of which moves axially during an open position of the outlet into a vent opening position.
Also, the pump body according to the invention includes inlet and outlet passages respectively terminating in inlet and outlet ports respectively located at one axial end of a cylindrical pressure accumulation chamber and opening radially outwardly from such chamber, the axis of the thimble shaped member extending at an angle between such passages, or extending parallel to the outlet passage.
The piston operating within the pump cylinder defines therewith a pump chamber in open communication with the pressure accumulation chamber via openings defining flexible extendable-shaped straps located in an end wall of the thimble-shaped element, such end wall preferably being of conical configuration when the axis of the element extends at an angle to the inlet and outlet passages, and being flat when the axis of the element extends parallel to the outlet passage.
In another embodiment according to the invention, the pressure accumulation chamber is omitted, and the pump chamber is defined between the piston and a cylindrical portion of the pump body
|
|
Gutter-related 
