EP3406161B1

EP3406161B1 - Cartridge core

Info

Publication number: EP3406161B1
Application number: EP17859360.4A
Authority: EP
Inventors: Yongqing Fang; Weifeng ZHU; Guofu Chen; Baifeng GU
Original assignee: Zhejiang Axilone Shunhua Aluminium and Plastic Co Ltd
Current assignee: Zhejiang Axilone Shunhua Aluminium and Plastic Co Ltd
Priority date: 2017-04-10
Filing date: 2017-11-28
Publication date: 2021-05-19
Anticipated expiration: 2037-11-28
Also published as: WO2018188348A1; CN107232735B; CN107232735A; EP3406161A1; EP3406161A4

Description

Technical Field

The disclosure relates to a technical field of rouge or lipstick packages, and more particularly, to a mechanism.

Background

A rouge or a lipstick is a frequently-used cosmetic for the female. Generally, it is of a paste shape or a fluid shape, and is placed in a packaging tube. The packaging tube is mainly composed of a cover body, a base and a mechanism, wherein the mechanism mostly consists of four parts, namely, a cup, a inner-body, a spiral and a shell. The cup is a container for containing the paste body; the inner-body and the spiral are cooperatively configured to drive a movement of the cup, thereby pushing the paste body out or hiding it in the packaging tube. The shell is fixed with the spiral to take a decorative effect.
For example, a mechanism of a lipstick tube disclosed in Patent Application No. CN201767295U comprises a shell, a spiral, an inner-body and a cup sleeving coaxially in sequence from outside to inside. The shell is fixedly connected with the spiral; a helical guiding groove is provided on an inner peripheral surface of the spiral; a notch provided along an axial direction of the inner-body is formed on a wall surface of the inner-body; a bulge penetrated through the notch and stretched to the guiding groove is provided on an outer peripheral surface of the cup; a plurality of convex points fixed on the inner peripheral surface of the spiral or on the outer peripheral surface of the inner-body are provided between a bottom end of the spiral and the inner-body. The spiral of the mechanism disclosed in the patent is axially fixed using limiting steps on the outer peripheral surface of the inner-body. However, due to a machining error, there is a space between the spiral and the limiting steps.
To solve the above problem, there is provided a lipstick tube mechanism in Patent Application No. CN204292453U . It comprises an inner-body and a spiral; an upper limiting ring for clamping an upper end surface of the spiral is provided on an outer wall, close to an upper end, of the inner-body. An elastic piece for abuting against a lower end surface of the spiral is provided on the outer wall, close to a lower end, of the inner-body. When the lipstick tube mechanism of the disclosure is assembled, the spiral sleeves outside the inner-body, and is clamped between the upper limiting ring at the upper end of the inner-body and the elastic piece at the lower end of the inner-body; and thus, the spiral is fixed relative to the inner-body on an axial direction and the product has no motion in an axial movement. Although the patent can solve the motion of the spiral, the structure of the inner-body is relatively complex, and the manufacturing cost is relatively high. In addition, the elastic piece is easy to have an irreversible deformation and loses a capability of compensating the space.
There is provided a lipstick dispenser in Patent Application No. US 006036387A . A lipstick dispenser includes a tubular element with a slideway in which there is mounted a cup for receiving a stick of lipstick and at least one stub engaged in a slideway, a cylindrical casing in the Wall of Which is provided at least one helical slot, this casing being fitted tightly onto the tubular element, the stub being engaged in a slot, and an outer sleeve in Which the casing is immobilized. The tubular element can turn relative to the casing and sleeve. A tongue, flexible in the radial direction, is provided on one of the casing and the tubular element components and is designed to interact with an inclined bearing surface provided on the other component. The tongue and the inclined bearing surface are situated, in the axial direction, beyond the lower end of the outer sleeve. Another cosmetic dispenser with an inner body rotatably engaged with a spiral member is described in document EP 3 096 645 .

Summary

The disclosure provides a mechanism comprising an inner-body and a spiral, two convex rings are provided on an outer wall of the inner-body to form two limiting steps, the two limiting steps are matched with two end portions of the spiral, so as to limit an axial movement of the spiral, wherein the spiral is provided with an annular elastic telescopic portion; the elastic telescopic portion is provided with a plurality of grooved holes provided along a circumferential direction of the elastic telescopic portion, thereby forming an elastic deformation strip between adjacent grooved holes, the elastic deformation strip is oblique to a plane perpendicular to the outer wall;wherein, an oblique angle of the elastic deformation strip is 10° -15° , the oblique angle of the elastic deformation strip is an angle between the elastic deformation strip and the plane perpendicular to the outer wall.
Since the spiral is of a thin tube structure made of a plastic material, and a hole is formed on a certain annular area thereof, a plurality of elastic deformation strips obliquely arranged are formed. The elastic deformation strips take an action of connecting upper and lower portions, and when the oblique angle changes under an action of an external force and an external force is eliminated, can recover the original oblique angle. Therefore, the area has a certain telescopic property on an axial direction.
For the mechanism of the prior art, the fit clearance between the spiral and a convex ring on the inner-body generally is about 0.1mm. Correspondingly, after the assembly is finished, a telescopic length of the elastic telescopic portion is 0.1-0.2mm.
The oblique angle of each of the elastic deformation strips has an impact on the telescopic amount of the elastic telescopic portion. The deformation amount will be undersized if the angle is overlarge. In case of 90° , there is no deformation amount completely.
The oblique angle of the elastic deformation strip is 10-15° .
In a preferred embodiment, there are four grooved holes and correspondingly four elastic deformation strips.
The grooved holes can be any form theoretically as long as the elastic deformation strip is formed. In order to guarantee an overall strength uniform, each of the plurality of grooved holes is of an isosceles trapezoid, an isosceles triangle or a prism.
More preferably, each of the grooved holes is of the isosceles trapezoid; two bottom edges of the isosceles trapezoid are perpendicular to an axial line of the spiral. Adjacent two elastic deformation strips are symmetrically provided, which means the directions of the adjacent grooved holes are opposite.
In order to prevent the spiral from being compressed excessively to incline such that the elastic deformation strips are torn, an upper bottom edge of each of the grooved holes is provided with a bulge extended to a lower bottom edge; the upper bottom edge refers to an upper bottom of the isosceles trapezoid, and the lower bottom edge refers to a lower bottom of the isosceles trapezoid. The bulge can abut against the lower bottom edge, thereby preventing the elastic telescopic portion from being compressed excessively.
A distance between the bulge and the lower bottom edge of the grooved hole corresponding to the bulge is 0.3-0.5mm.
An annular groove is provided inside a bottom end of the spiral; an elastic piece abutting against a bottom surface of the annular groove is provided on the outer wall of the inner-body. The elastic piece abuts against the bottom surface of the annular groove, so when the spiral is rotated, a friction is provided between the elastic piece and the spiral, thereby generating a certain torsion to improve the hand feeling in use.
The elastic telescopic portion is provided at a position where the annular groove locates. The annular groove is equivalent to a clearance between the inner-body and the spiral, thus providing a space for the deformation of an elastic deformation piece.
According to the mechanism of the invention, by forming the grooved holes in the certain annular area of the spiral and forming the plurality of the elastic deformation strips arranged along a circumferential direction thereof, the spiral has a certain telescopic capability. The spiral is provided at an outer peripheral surface of the inner-body in a sleeving manner, so if the original length of the spiral is greater than the space between the two limiting steps of the inner-body, the two end portions of the spiral can implement tight assembly with the limiting steps and the motion is avoided.
In the invention, by opening holes on a sidewall of the spiral to form the elastic telescopic portion, the mould opening is relatively easy and the manufacturing cost is low. The elastic deformation strips are provided obliquely, so to achieve the same telescopic amount of the spiral, the elastic deformation strips are required to have a relatively small deformation compared with the existing structure. Therefore, the irreversible deformation is not easily occurred.

Brief Description of the Drawings

Fig. 1 is a cross-section diagram of a mechanism of the prior art.
Fig. 2 is an enlarged view of a local A portion in Fig. 1.
FIG .3 is a systematic diagram of an explosion structure of a mechanism of the invention.
Fig. 4 is a systematic diagram of an assembly structure of a mechanism of the invention.
Fig. 5 is a longitudinal cross-section diagram of a mechanism of the invention.
Fig. 6 is an enlarged view of a local B portion in Fig. 5.
Fig. 7 is an enlarged view of a local C portion in Fig. 5.
Fig. 8 is a structure diagram of a shell and a spiral in a separation state of the invention.
Fig. 9 is a transverse cross-section diagram of a mechanism of the invention.
Fig. 10 is an enlarged view of a local D portion in Fig. 9.
Fig. 11 is a comparison diagram in a structural change before and after a spiral is assembled, in which (a) is an inner-body, (b) is a spiral before assembly and (c) is a spiral after assembly.

Detailed Description of the Embodiments

As shown in Fig. 1, a mechanism of the prior art comprises a shell 1, a spiral 2, an inner-body 4 and a cup 3, all of which sleeve together coaxially in sequence from outside to inside; two convex rings are provided on an outer wall of the inner-body to form two limiting steps; the two limiting steps are matched with two end portions of the spiral 2, so as to limit an axial movement of the spiral. As shown in Fig. 2, due to a machining error, a space about 0.1mm is provided between a top of the spiral 2 and each of the limiting steps 42.
As shown in Fig. 3 and Fig. 5, a mechanism of the invention also comprises a shell 1, a spiral 2, an inner-body 4 and a cup 3; an inner wall of the spiral 2 is provided with a helical groove 21; guiding grooves 41 arranged along an axial direction of the inner-body 4 are provided on the inner-body 4; two bulges 31 penetrated through the guiding grooves 41 respectively and stretched to the groove 21 are provided on an outer wall of the cup 3; the shell 1 is fixedly provided on an outer peripheral surface of the spiral 2 in a sleeving manner.
As shown in Fig. 8 to Fig. 10, a top portion of the shell is provided with an internal turnup 11, and a bottom inner wall of the shell after being thinned is folded to form a double-layer structure 13. Atop end of the spiral 2 is matched with the internal turnup 11, and a side surface is further provided with a snap ring 27 matched with the double-layer structure 13, such that the shell 1 is axially fixed relative to the spiral 2. An inner wall of the shell 1 is provided with splines 12 arranged along an axial direction of the shell 1. Correspondingly, the outer wall of the spiral 2 is provided with spline grooves 26 matched with the splines 12. After the spline grooves 26 and the splines 12 are matched, the shell 1 and the spiral 2 are circumferentially fixed. In such a design, the shell 1 and the spiral 2 are fixedly connected and the usage of glue is avoided, being more environment-friendly.
In order to solve the problems of the mechanism in the prior art, as shown in Fig. 4, the spiral 2 of the mechanism of the invention is provided with an annular elastic telescopic portion 20; the elastic telescopic portion 20 is provided with four grooved holes 23 arranged along a circumferential direction of the elastic telescopic portion 20; the grooved holes 23 are of an isosceles trapezoid and the directions of adjacent grooved holes are opposite, such that two edges next to one another are mutually parallel and oblique elastic deformation strips 24 are formed therebetween. The elastic deformation strips 24 take a connecting effect. More importantly, it may be deformed such that the spiral 2 has a certain telescopic property.
The maximum telescopic amount and the resilience force of the spiral are associated with materials thereof and oblique length, length, width and the like of the oblique elastic deformation strips 24. To obtain appropriate resilience, it is necessary to take above factors into account comprehensively. The oblique angle of each of the elastic deformation strips 24 generally is 10-15° , the spiral generally is made of lubricant-containing high molecular materials such as Polyvinyl Chloride (PVC) and Polycarbonate (PC), and the length and the width both are adjusted as required.
If the elastic telescopic portion 20 is shrunk excessively and is beyond a yield strength of the material, the elastic deformation strips 24 may be torn. To solve the problem, an upper bottom edge of each of the grooved holes 23 is provided with a bulge 25 extended to a lower bottom edge; the distances L1 from the bulges 25 to the lower bottom edges of the grooved holes 23 are 0.45mm and may be adjusted to 0.3-0.5mm as required. That is, the maximum shrinkage length of the spiral 2 may be controlled within 0.3-0.5mm.
Each of the grooved holes 23 in the embodiment is of the isosceles trapezoid, and also may be an isosceles triangle, a prism and the like. When it is the isosceles triangle, the grooved hole is overhigh, so the isosceles trapezoid is adopted. If the prism is adopted, all elastic deformation strips 24 are inclined toward a same direction.
As shown in Fig. 6 and Fig. 7, two limiting steps 42, 44 are provided on the outer wall of the inner-body 4, and are respectively matched with upper and lower end surfaces of the spiral 2. An annular groove 22, which is equivalent to a space between the spiral 2 and the inner-body 4, is further provided inside a bottom portion of the spiral 2. In the space, elastic pieces 43 abuting against the spiral 2 are provided on the outer wall of the inner-body 4. In use, the spiral 2 is rotated relative to the inner-body 2, the elastic pieces 43 rub an inner wall of the spiral and a friction force is a resistance force for rotation of a lipstick tube, such that a "dignified" hand feeling is provided. It may be possible to adjust the corresponding hand feeling by adjusting the number and the area of the elastic pieces 4 till an expected effect is achieved. The elastic telescopic portion 20 is provided at a position where the annular groove 22 locates, and the space herein provides a space for the deformation of the elastic deformation strips.
As shown in Fig. 11, before assembly, a distance L1 between each of the bulges 25 and the lower bottom edge of the grooved hole 23 corresponding to the bulge is 0.45mm, and a height of the spiral 2 is greater than a space between the limiting step 42 and the limiting step 44 on the inner-body 4. After assembly, a distance L2 between the bulge 25 and the lower bottom edge of the grooved hole 23 is 0.3mm; that is, the elastic telescopic portion 20 is shrunk axially with 0.15mm. Due to the resilience force of the elastic deformation strips 24, the two end surfaces of the spiral 2 abut against the limiting step 42 and the limiting step 44. Because there is no any small space therebetween, the spiral 2 is not moved during use.
The elastic deformation strips 24 of the invention are obliquely provided. Mechanism shrapnels disclosed in CN204292453U are horizontally provided. On a premise of a same shrinkage length, the deformation amount of the elastic pieces obliquely provided is smaller than that of the elastic pieces horizontally provided, and therefore relatively speaking, the irreversible deformation is not easily occured. In addition, the elastic pieces are provided on the spiral, so the mould opening and the manufacturing are relatively easy and the cost is low.

Claims

A mechanism for cosmetic packagings such as lipstick tubes, comprising an inner-body (4) and a spiral (2), two convex rings are provided on an outer wall of the inner-body (4) to form two limiting steps (42, 44), the two limiting steps (42, 44) are matched with two end portions of the spiral (2), so as to limit an axial movement of the spiral (2), wherein the spiral (2) is provided with an annular elastic telescopic portion (20); the elastic telescopic portion (20) is provided with a plurality of grooved holes (23) provided along a circumferential direction of the elastic telescopic portion (20), thereby forming an elastic deformation strip (24) between adjacent grooved holes(23), the elastic deformation strip (24) is oblique to a plane perpendicular to the outer wall;
wherein, an oblique angle of the elastic deformation strip (24) is 10° -15° , the oblique angle of the elastic deformation strip (24) is an angle between the elastic deformation strip (24) and the plane perpendicular to the outer wall.
The mechanism as claimed in claim 1, wherein after an assembly is finished, a telescopic length of the elastic telescopic portion (20) is 0.1-0.2mm; wherein the telescopic length of the elastic telescopic portion (20) is a length of axial telescoping along the spiral (2).
The mechanism as claimed in claim 1, wherein there are four grooved holes (23) and correspondingly four elastic deformation strips (24).
The mechanism as claimed in claim 1, wherein each of the plurality of grooved holes (23) is of an isosceles trapezoid, an isosceles triangle or a prism.
The mechanism as claimed in claim 4, wherein when the mechanism comprises multiple elastic deformation strips (24), each of the grooved holes (23) is of the isosceles trapezoid; two bottom edges of the isosceles trapezoid are perpendicular to an axial line of the spiral (2); adjacent two elastic deformation strips (24) are symmetrically provided.
The mechanism as claimed in claim 5, wherein an upper bottom edge of each of the grooved holes (23) is provided with a bulge (25) extended to a lower bottom edge.
The mechanism as claimed in claim 6, wherein a distance between the bulge (25) and the lower bottom edge of the grooved hole (23) corresponding to the bulge (25) is 0.3-0.5mm.
The mechanism as claimed in claim 1, wherein an annular groove (22) is provided inside a bottom end of the spiral (2); an elastic piece (43) abutting against a bottom surface of the annular groove (22) is provided on the outer wall of the inner-body (4).
The mechanism as claimed in claim 8, wherein the elastic telescopic portion (20) is provided at a position where the annular groove (22) locates.