초록 ▼

An improved manually actuated pump is disclosed for dispensing a volume of liquid from a container, comprising a body having a duct with a duct conduit communicating with the body. A piston is disposed within the body for slidably sealing with the duct to define a pump chamber with at least a portio

An improved manually actuated pump is disclosed for dispensing a volume of liquid from a container, comprising a body having a duct with a duct conduit communicating with the body. A piston is disposed within the body for slidably sealing with the duct to define a pump chamber with at least a portion of the piston being disposed external to the body defining a piston stem having a stem passage extending therethrough. A spring biases the piston into an extended position. An induction tube is received within the duct conduit for providing fluid communication between the liquid within the container and the pump chamber. A first one-way valve enables the flow of the liquid only from the container into the pump chamber whereas a second one-way valve enables the flow of the liquid only from the pump chamber into the stem passage. An actuator having a terminal orifice communicates with the stem passage for discharging a volume of the liquid from the container through the terminal orifice upon a longitudinal movement of the actuator from the extended position to a retracted position by an operator.

대표청구항 ▼

An improved one-way valve for a manually actuated pump for dispensing a volume of liquid from a container, comprising in combination: a body having a first and a second body end with an internal body surface defining an internal body region; securing means for securing said body to the container; a

An improved one-way valve for a manually actuated pump for dispensing a volume of liquid from a container, comprising in combination: a body having a first and a second body end with an internal body surface defining an internal body region; securing means for securing said body to the container; a duct extending from said first end of said body into said internal body region of said body; said duct having a substantially cylindrical external duct surface and an internal duct surface defining a duct conduit communicating with said internal body region of said body; a piston having a first and a second piston portion with said first piston portion disposed within said internal body region of said body and with at least a portion of said second piston portion being disposed external to said internal body region of said body; a spring coacting between said body and said pistol for biasing said piston into an extended position; said first portion of said piston being substantially cylindrical to slidably seal with said external duct surface for defining a pump chamber; an induction tube receivable within said duct conduit for providing fluid communication between the liquid within the container and said pump chamber; a first one-way valve disposed within said duct conduit for enabling the flow of the liquid only from the container into said pump chamber; said second piston portion defining a piston stem having a first stem end disposed within said internal body region and a second stem end disposed external said internal body region with a stem passage extending therebetween; a second one-way valve disposed in proximity to said stem passage for enabling the flow of the liquid only from said pump chamber into said stem passage of said piston stem: an actuator having a terminal orifice communicating with said stem passage of said piston stem; said actuator discharging a volume of the liquid from the container through said terminal orifice upon a longitudinal movement of said actuator from said extended position to a retracted position by an operator; said second one-way valve comprising said first stem end of said piston stem defining a second valve seat and a second valve element being moveable within said stem passage and biased into engagement with said second valve seat; said second valve element defining a first and a second end with said second end having a respite for receiving a helical spring therein; said helical spring disposed in said respite for biasing said second valve element into engagement with said second valve seat; and said helical spring having a helical pitch for substantially totally collasping when said second valve element is displaced from said second valve seat for occupying a substantial volume of said respite.