초록 ▼

The present invention relates to a press-type liquid pump. The liquid pump comprises a fixed unit fixed relative to a container and a movable unit capable of performing a reciprocating motion relative to the fixed unit, and a liquid product is pumped to the exterior of the container. The reciprocati

The present invention relates to a press-type liquid pump. The liquid pump comprises a fixed unit fixed relative to a container and a movable unit capable of performing a reciprocating motion relative to the fixed unit, and a liquid product is pumped to the exterior of the container. The reciprocating motion is achieved by a pressing force applied by a user to the movable unit to move the movable unit relative to the fixed unit in combination with an elastic restoring means for restoring the movable unit relative to the fixed unit after the pressing force is removed. The elastic restoring means is a plastic elastic compressing means located below a toothed sleeve and installed between the fixed unit and the movable unit, which comprises at least one elastic strip generally formed in an arc shape.

대표청구항 ▼

1. A press-type liquid pump for fitting to a container to pump a liquid product within the container to an exterior of the container, the liquid pump defining a longitudinal axis and comprising: a fixed unit fixed relative to the container, the fixed unit including a toothed sleeve for fixing the li

1. A press-type liquid pump for fitting to a container to pump a liquid product within the container to an exterior of the container, the liquid pump defining a longitudinal axis and comprising: a fixed unit fixed relative to the container, the fixed unit including a toothed sleeve for fixing the liquid pump to the container and a cylinder which is located below and fixedly connected to the toothed sleeve; anda movable unit capable of performing a reciprocating motion relative to the fixed unit, the liquid product being pumped to the exterior of the container by means of the reciprocating motion, the reciprocating motion being achieved by a pressing force applied by a user to the movable unit to move the movable unit relative to the fixed unit along the longitudinal axis of the liquid pump in combination with an elastic force of an elastic restoring means for restoring the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed, the movable unit comprising a pressing head which is positioned above the toothed sleeve for the user to press and a piston rod which is positioned below and fixedly connected to the pressing head,the elastic restoring means being a plastic elastic compressing means which is located below the toothed sleeve and installed between the piston rod and the cylinder, the plastic elastic compressing means comprising at least one elastic strip generally formed in an arc shape, an upper end of the elastic strip acting on the piston rod and a lower end of the elastic strip acting on the cylinder, such that a movement of the piston rod relative to the cylinder along the longitudinal axis causes the elastic strip to be elastically compressed, and a line of action of a resultant force of elastic forces generated by the elastic strip is always coincident with the longitudinal axis. 2. The liquid pump as claimed in claim 1, wherein the elastic strip is deformed in one and the same plane which passes through the longitudinal axis. 3. The liquid pump as claimed in claim 1, wherein the elastic strip is deformed in one and the same plane which does not pass through the longitudinal axis. 4. The liquid pump as claimed in claim 1, at least one of the upper end and the lower end of the elastic strip is connected together by a base. 5. The liquid pump as claimed in claim 4, wherein the base is in the form of a circular ring. 6. The liquid pump as claimed in claim 4, wherein, without the pressing force applied to the pressing head, the liquid pump is able to switch between a first position in which the plastic elastic compressing means is in an unloaded state and a second position in which the plastic elastic compressing means is in a pre-loaded state, by means of rotation of the piston rod around the longitudinal axis. 7. The liquid pump as claimed in claim 1, wherein the lower end of the plastic elastic compressing means acts on an upper portion of the cylinder. 8. The liquid pump as claimed in claim 1, wherein the lower end of the plastic elastic compressing means acts on a lower portion of the cylinder. 9. The liquid pump as claimed in claim 1, wherein, when uncompressed, a ratio of a length of the elastic strip from the upper end to the lower end along the arc shape to a distance thereof in the direction of the longitudinal axis is within a range greater than 1 and less than π/2. 10. A press-type liquid pump for fitting to a container to pump a liquid product within the container to an exterior of the container, the liquid pump defining a longitudinal axis and comprising: a fixed unit fixed relative to the container, the fixed unit including a toothed sleeve for fixing the liquid pump to the container; anda movable unit capable of performing a reciprocating motion relative to the fixed unit, the liquid product being pumped to the exterior of the container by means of the reciprocating motion, the reciprocating motion being achieved by a pressing force applied by a user to the movable unit to move the movable unit relative to the fixed unit along the longitudinal axis of the liquid pump in combination with an elastic force of an elastic restoring means for restoring the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed, the movable unit comprising a pressing head which is positioned above the toothed sleeve for a user to press,the elastic restoring means being a plastic elastic compressing means which is installed between the pressing head and the toothed sleeve, the plastic elastic compressing means comprising at least two elastic strips which are arranged around the longitudinal axis, an upper end of each of the elastic strips acting on the pressing head while a lower end of each of the elastic strips is connected to the toothed sleeve, such that a movement of the pressing head relative to the toothed sleeve along the longitudinal axis causes the elastic strips to be elastically compressed, and a line of action of a resultant force of elastic forces generated by the elastic strips is always coincident with the longitudinal axis,each of the elastic strips being generally formed in an arc shape, and when uncompressed, a ratio of a length of each of the elastic strips from the upper end to the lower end along the arc shape to a distance thereof in the direction of the longitudinal axis is within a range greater than 1 and less than π/2. 11. The liquid pump as claimed in claim 10, wherein each of the elastic strips is deformed in one and the same plane which passes through the longitudinal axis. 12. The liquid pump as claimed in claim 10 wherein each of the elastic strips is deformed in one and the same plane which does not pass through the longitudinal axis. 13. The liquid pump as claimed in claim 10, wherein at least one of the upper end and the lower end of the elastic strips is connected together by a base. 14. The liquid pump as claimed in claim 10, wherein the base is in the form of a ring. 15. The liquid pump as claimed in claim 10, wherein, without the pressing force applied to the pressing head, the liquid pump is able to switch between a first position in which the plastic elastic compressing means is in an unloaded state and a second position in which the plastic elastic compressing means is in a pre-loaded state, by means of rotation of the pressing head relative to the toothed sleeve around the longitudinal axis. 16. The liquid pump as claimed in claim 15, wherein the upper ends of the elastic strips are connected together by a ring, the ring comprising two bearing faces at different levels in the direction of the longitudinal axis, a phase difference between the two bearing faces in the direction of rotation being approximately 90 degrees, the pressing head being provided at a lower side thereof with a projection for cooperating with the bearing faces, so as to compress or stretch the plastic elastic compressing means by means of rotation of the pressing head relative to the toothed sleeve. 17. A press-type liquid pump for fitting to a container to pump a liquid product within the container to an exterior of the container, the liquid pump defining a longitudinal axis and comprising: a fixed unit fixed relative to the container and including a toothed sleeve for fixing the liquid pump to the container and a piston rod fixed relative to the toothed sleeve; anda movable unit capable of performing a reciprocating motion relative to the fixed unit, the liquid product being pumped to the exterior of the container by means of the reciprocating motion, the reciprocating motion being achieved by a pressing force applied by a user to the movable unit to move the movable unit relative to the fixed unit along a longitudinal axis of the liquid pump in combination with an elastic force of an elastic restoring means for restoring the movable unit relative to the fixed unit along the longitudinal axis after the pressing force is removed, the movable unit comprising a pressing head which is positioned above the toothed sleeve for a user to press and a cylinder which is fixedly connected to the pressing head,the elastic restoring means being a plastic elastic compressing means which is located below the toothed sleeve and installed between the cylinder and the piston rod, the plastic elastic compressing means comprising at least one elastic strip generally formed in an arc shape, an upper end of the elastic strip acts on the cylinder and a lower end of the elastic strip acts on the piston rod, such that a movement of the cylinder relative to the piston rod along the longitudinal axis causes the elastic strip to be elastically compressed, and a line of action of a resultant force of elastic forces generated by the elastic strip is always coincident with the longitudinal axis. 18. The liquid pump as claimed in claim 17, wherein each of the at least one elastic strip is deformed in one and the same plane which passes through the longitudinal axis. 19. The liquid pump as claimed in claim 17, wherein each of the at least one elastic strip is deformed in one and the same plane which does not pass through the longitudinal axis. 20. The liquid pump as claimed in claim 17, wherein at least one of the upper end and the lower end of the at least one elastic strip is connected together by a base. 21. The liquid pump as claimed in claim 20, wherein the base is in the form of a ring.