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PumpRelated Patent Categories: Pumps, Expansible Chamber Type, Biasing Means Effects Induction Stroke Of Abutment Driven, Vacuum Producing Pumping MemberPump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070110602, Pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to a pump, more particularly to a pump adapted to dispense liquid from a container. [0003] 2. Description of the Related Art [0004] As shown in FIG. 1 and FIG. 2, a container assembly for a liquid, such as shampoo, lotion, etc., includes a container (not shown) for receiving the liquid, a conventional pump 10, and a nozzle assembly 17 including a nozzle 171, a cap 172, and a riser tube 174 (partially shown in FIG. 1) . The nozzle 171 and the riser tuber 174 are coupled to the conventional pump 10 at opposite ends, respectively. The conventional pump 10 is movable together with the nozzle 171 relative to the container such that the liquid in the container can be dispensed from the container through the riser tube 174 and out of the nozzle 171. [0005] The conventional pump 10 includes a tubular main body 11, an inlet valve 12, a delivery shaft 13, a piston 14, an elastic component 16, and a delivery tube 15. [0006] The main body 11 extends along an axis (X) and has an upper body part 111 confining a chamber 113, and a lower body part 112 connected to the upper body part 111 and confining an inlet 114 distal from the upper body part 111. [0007] The inlet valve 12 includes a valve seat 121 formed in the lower body part 112, and a ball member 122 disposed in the lower body part 112 and seated movably on the valve seat 121 to block fluid communication between the inlet 114 and the chamber 113. [0008] The delivery shaft 13 extends through the upper body part 111 into the chamber 113 along the axis (X), and includes an upper delivery segment 131, and a lower piston-seating segment 133 connected to the delivery segment 131. The delivery segment 131 is formed with two channels 132 to be disposed in fluid communication with the chamber 113. [0009] The piston 14 is disposed movably in the chamber 113 along the axis (X), and includes a sleeve portion 141 sleeved on the delivery segment 131 of the delivery shaft 13, a peripheral portion 142 disposed around the sleeve portion 141 and in sealing contact with the upper body part 111, and a connecting portion 143 that interconnects the sleeve and peripheral portions 141, 142. [0010] The elastic component 16 is a compression spring that is disposed in the main body 11, that is sleeved on the piston-seating segment 133 of the delivery shaft 13, and that has opposite ends that abut against the lower body part 112 and the piston-seating segment 133, respectively. The elastic component 16 provides a biasing force to move the delivery shaft 13 away from the inlet valve 12, and to cause the piston-seating segment 133 to push the sleeve portion 141 of the piston 14 away from the inlet valve 12. [0011] The delivery tube 15 is sleeved on the delivery segment 131 of the delivery shaft 13, is connected to the nozzle 171, and is spaced apart from the piston 14 at a separation distance (D) . The delivery tube 15 is operable to drive movement of the delivery shaft 13 toward the inlet valve 12 against urging action of the elastic component 16. [0012] As shown in FIG. 3, to dispense the liquid from the container, the nozzle 171 is pressed downwardly along the axis (X) to actuate the delivery tube 15 to push the delivery shaft 13 toward the inlet valve 12 until the delivery tube 15 abuts against the sleeve portion 141 of the piston 14, at which point the piston-seating segment 133 of the delivery shaft 13 is spaced apart from the sleeve portion 141 of the piston 14 at the separation distance (D) due to pressure in the chamber 113, such that the channels 132 are in fluid communication with the chamber 113. The nozzle 171 is pressed downwardly in the direction as illustrated by arrow (A) along the axis (X) further to actuate the delivery tube 15 to push the delivery shaft 13 and the piston 14 toward the inlet valve 12. At the same time, the elastic component 16 is compressed, and the pressure in the chamber 113 is increased, such that the liquid in the chamber 113 is dispensed through the channels 132 out of the nozzle 171. [0013] As shown in FIG.4, when the nozzle 171 is released, the biasing force of the elastic component 16 moves the delivery shaft 13 away from the inlet valve 12 in the direction as illustrated by arrow (B), and causes the piston-seating segment 133 of the delivery shaft 13 to abut against the sleeve portion 141 of the piston 14 away from the inlet valve 12, such that fluid communication between the channels 132 and the chamber 113 is prevented. Due to pressure difference inside the chamber 113 and the riser tube 174, the ball member 122 moves away from the valve seat 121, such that the inlet 114 is in fluid communication with the chamber 113 to permit flow of the liquid from the container into the chamber 113. As the pressure inside the chamber 113 and that inside the riser tube 174 reach equilibrium, the ball member 122 is seated once more on the valve seat 121 such that fluid communication between the inlet 114 and the chamber 113 is blocked once again, as best illustrated in FIG. 1. [0014] As shown in FIG. 5, when the liquid is highly viscous, it is likely to accumulate on the valve seat 121, such that the ball member 122 cannot be properly seated thereon to block fluid communication between the inlet 114 and the chamber 113. As result, the liquid cannot be dispensed from the container. SUMMARY OF THE INVENTION [0015] Therefore, the object of the present invention is to provide a pump that is adapted to dispense highly viscous liquids from a container. [0016] According to the present invention, there is provided a pump that includes a tubular main body, an inlet valve, a delivery shaft, a piston, an elastic component, and a delivery tube. The main body extends along an axis and has an upper body part confining a chamber, and a lower body part connected to the upper body part and confining an inlet distal from the upper body part. The inlet valve includes a valve seat formed in the lower body part, and a ball member disposed in the lower body part and seated movably on the valve seat to block fluid communication between the inlet and the chamber. The delivery shaft extends through the upper body part into the chamber along the axis, and includes an upper delivery segment, a lower valve-control segment, and a piston-seating segment disposed between the delivery and valve-control segments. The delivery segment of the delivery shaft is formed with a channel to be disposed in fluid communication with the chamber. The piston is disposed movably in the chamber and includes a sleeve portion sleeved on the delivery segment of the delivery shaft, a peripheral portion disposed around the sleeve portion and in sealing contact with the upper body part, and a connecting portion that interconnects the sleeve and peripheral portions. The elastic component is disposed in the main body for providing a biasing force to move the valve-control segment of the delivery shaft away from the inlet valve, and to cause the piston-seating segment of the delivery shaft to push the sleeve portion of the piston away from the inlet valve. The delivery tube is sleeved on the delivery segment of the delivery shaft, and is operable to drive movement of the delivery shaft toward the inlet valve such that the valve-control segment of the delivery shaft forces the ball member to be seated on the valve seat, and to drive movement of the piston toward the inlet valve. BRIEF DESCRIPTION OF THE DRAWINGS [0017] Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which: [0018] FIG. 1 is a sectional view of a conventional pump coupled to a nozzle assembly; [0019] FIG. 2 is a top sectional view taken along line II-II in FIG. 1; [0020] FIG. 3 is a sectional view similar to FIG. 1, illustrating pressing of a nozzle; [0021] FIG. 4 is a sectional view similar to FIG. 1, illustrating releasing of the nozzle; Continue reading about Pump... Full patent description for Pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Pump or other areas of interest. ### Previous Patent Application: Compressor unit comprising a centrifugal compressor and an electric motor Next Patent Application: High-pressure fuel pump Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Pump patent info. IP-related news and info Results in 0.21114 seconds Other interesting Feshpatents.com categories: Accenture , Agouron Pharmaceuticals , Amgen , AT&T , Bausch & Lomb , Callaway Golf 174 |
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