Piston structure of pumping type cosmetic container

Abstract

A piston structure of a pumping-type cosmetic container. The piston structure includes two pistons which come into close contact with an inner wall of a container body and are overlapped. During a pumping operation, a first piston firstly ascends to a certain section and then lifts up a second piston located on the lower part thereof such that the first piston and the second piston ascend together; thus, it is possible to reduce the volume taken up by the pistons when the contents are initially filled, while the thickness for a normal operation of the pistons is still maintained, so that relatively more contents for the same volume can be filled in the same container.

Claims

1. A piston structure of a cosmetic container, the cosmetic container comprising: a piston which is installed inside a container body receiving contents therein, wherein the piston ascends as the contents are consumed by a pumping operation, wherein the piston comprises: a first piston having a hollow cavity; and a second piston having a closed upper end portion and liftably coupled to the hollow cavity, wherein the second piston overlaps the first piston when the contents are initially filled and is configured to firstly ascend independently of the first piston as the contents are consumed, the second piston configured to subsequently lift the first piston such that the first and the second pistons ascend together, wherein the first and the second pistons are configured to ascend while the first and the second pistons are in close contact with an inner wall of the container body, wherein a locking jaw is formed on an inner upper portion of the first piston to surround an inner circumferential surface of the first piston such that the first and the second pistons ascend together while being in contact with each other, wherein a coupling portion which is liftably coupled to the hollow cavity of the first piston is provided to a lower central portion of the second piston, wherein the coupling portion comprises a locking protrusion formed on a lower outer circumferential surface thereof such that the first and the second pistons ascend together while the locking protrusion is in contact with the locking jaw.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an exploded perspective view illustrating elements of a piston structure of a pumping-type cosmetic container according to a preferred embodiment of the present invention.

(2) FIG. 2 is a cross-sectional view illustrating a coupled piston structure of a pumping-type cosmetic container according to a preferred embodiment of the present invention.

(3) FIGS. 3 and 4 are schematic diagrams illustrating operations of a piston installed in a pumping-type cosmetic container according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION

(4) Hereinafter, the present invention will be described in detail with reference to the drawings. Like reference numerals refer to like elements throughout.

(5) FIG. 1 is an exploded perspective view illustrating constituents of a piston structure of a pumping-type cosmetic container according to a preferred embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a coupled piston structure of a pumping-type cosmetic container according to a preferred embodiment of the present invention, and FIGS. 3 and 4 are schematic diagrams illustrating operations of a piston installed in a pumping-type cosmetic container according to a preferred embodiment of the present invention.

(6) Referring to FIGS. 1 to 4, a piston 100 of a pumping-type cosmetic container according to a preferred embodiment of the present invention is installed inside a container body 10 in which contents are received, and includes a first piston 110 and a second piston 120, the piston 100 being configured to ascend as the contents are consumed.

(7) The first piston 110 is in close contact with an inner wall of the container body 10 such that the first piston 110 may ascend together with the second piston 120 as the second piston 120 which will be described below ascends, and a hollow cavity 111 is formed such that a coupling portion of the second piston 120 is coupled thereto.

(8) In the present invention, the first piston 110 is characterized by including a locking jaw 112 formed on an inner upper portion thereof to surround an inner circumferential surface such that the first piston 110 may ascend together with the second piston 120 while the first piston is in close contact with the second piston, and a locking protrusion 122 of the second piston 120 is configured to be in contact with a lower end of the locking jaw 112 as the second piston 120 ascends such that the first piston 110 possibly ascends together with the second piston 120 as the second piston 120 ascends.

(9) The second piston 120 is located in close contact with the inner wall of the container body 10, is liftably coupled to the hollow cavity 111, and has a closed upper end portion, and in the present invention, the second piston 120 is characterized in that the second piston 120 is located overlapping the first piston 110 when the contents are initially filled, then the second piston 120 firstly ascends independently as the contents are consumed, and thus the first piston 110 is lifted up such that the first and the second pistons 110 and 120 ascend together.

(10) For this, a coupling portion 121 which is liftably coupled to the hollow cavity 111 of the first piston 110 is provided to a lower central portion of the second piston 120, and a locking protrusion 122 is formed on an outer circumferential surface of the coupling portion 121 such that the locking protrusion 122 is in contact with the lower section of the locking jaw 112 while the second piston 120 ascends, and thus the second piston 120 and the first piston 110 may ascend together by the locking protrusion.

(11) Hereinafter, operations of the piston installed in the pumping-type cosmetic container according to a preferred embodiment of the present invention will be described with reference to FIGS. 3 and 4.

(12) FIGS. 3 and 4 are schematic diagrams illustrating operations of the piston installed in the pumping-type cosmetic container according to a preferred embodiment of the present invention.

(13) Referring to FIGS. 3 and 4, the piston installed in the pumping-type cosmetic container according to a preferred embodiment of the present invention is configured such that the first piston 110 and the second piston 120 are located overlapping each other after the contents are initially filled, and when a user performs a pumping operation using a pumping means provided on an upper portion of the container body 10, the second piston 120 firstly ascends independently until the locking protrusion 122 of the second piston 120 contacts the locking jaw 112 of the first piston 110, and the second piston 120 then ascends together with the first piston 110 by lifting the first piston 110.

(14) As described above, according to the present invention, the piston 100 installed inside the container body 10 is configured to include the first and the second pistons 110 and 120, wherein the first and the second pistons 110 and 120 are located overlapping each other when the contents are initially filled such that the thickness of the piston is made thin, thus the volume taken up by the piston may be reduced, and thus relatively more contents can be filled in the same container having the same volume, and also the first piston firstly ascends to a predetermined section and then lifts up the second piston provided thereunder such that the first and the second pistons ascend together, and thus a thickness for a normal operation of the pistons can be maintained.

(15) Hitherto, the best mode has been disclosed in the drawings and specification. Although the specific terms have been used herein, they have been used merely for the purpose of describing the present invention, and have not been used to limit the meanings thereof and the scope of the present invention set forth in the claims. Therefore, it will be understood by those having ordinary knowledge in the art that various modifications and other equivalent embodiments can be made. Hence, the technical range of the present invention shall be defined by the technical spirit of the accompanying claims.