Anti-deformation plastic pivoting shaft

Abstract

An anti-deformation plastic pin joint shaft comprises a cover body, a base and a pin joint unit, the cover body is provided with a pin joint part, two axial ends of the pin joint part are respectively provided with a shaft hole in a penetrating mode, a notch is formed in the position, corresponding to the pin joint part, of the base, and through holes are formed in the positions, close to the two sides of the notch, corresponding to the shaft holes respectively in a penetrating mode. The pivot joint unit comprises two pivot joint shafts which are approximately solid cylinders, each pivot joint shaft is provided with a cutting groove, each pivot joint shaft is arranged in each through hole and each shaft hole in a penetrating mode, each cutting groove can provide margin space when each pivot joint shaft expands with heat and contracts with cold, and therefore the diameter of each pivot joint shaft is almost not changed. Therefore, no gap is generated between each pivoting shaft and each shaft hole, a certain friction force can be generated between the cover body and the surface of each pivoting shaft when the cover body is opened, the cover body can be maintained at any angle when the cover body is opened and cannot fall towards the base, and the use convenience is improved.

Description

Technical Field

[0001] The present invention relates to a plastic pivot shaft, and in particular to a plastic pivot shaft that resists deformation. Background Art

[0002] A conventional cosmetic box has a plastic cover and a base. The cover and the base are respectively provided with pivot holes and are fixedly connected by a metal pin. Usually, consumers directly hand over the entire cosmetic box for recycling after use. However, due to the difference in materials, recycling companies must first remove the pin for separate recycling, and cannot recycle it together with the plastic cover and base to avoid damage to the recycling equipment, which also causes trouble for recycling companies.

[0003] In view of this, the applicant has developed a plastic pin pivotally mounted on the cover and base of a cosmetic box and its application to address the above shortcomings. The above metal pin is replaced with a pin made of plastic. Since the pin, the cover and the base are all made of plastic, they can be recycled as a whole to solve the recycling problem.

[0004] However, the volume of the plastic pin is easily expanded and contracted due to temperature changes. When the temperature is high, the volume of the pin expands, and the pivot hole that penetrates the cover and the base will be enlarged by the pin. When the temperature rises, the volume of the pin returns to its original state, but the pivot hole has been expanded and shaped, so a gap will be generated between the pin and the pivot hole, and effective friction cannot be generated with the cover, resulting in the cover being unable to maintain a position at any specific angle when opened, causing inconvenience in use.

[0005] Therefore, based on the applicant's many years of experience in manufacturing, developing and designing related products, the applicant has developed a deformation-resistant plastic pivot shaft after detailed design and careful evaluation for the above-mentioned goals, which can completely solve or effectively improve many of the conventional deficiencies. Summary of the invention

[0006] The object of the present invention is to provide a plastic pivot shaft that resists deformation, which has a simple structure and is easy to operate and maintain, and can solve or effectively improve many defects of conventional ones.

[0007] To achieve the above object, the present invention discloses a deformation-resistant plastic pivot shaft, which is characterized by comprising:

[0008] A cover body, wherein a pivot portion is extended downwardly from one side of the periphery of the cover body, and an axial hole is respectively formed at two axial ends of the pivot portion;

[0009] A base, which can be relatively covered with the cover body, a notch is formed on the periphery of the base corresponding to the pivotal portion, and a through hole is respectively formed on both sides adjacent to the notch and corresponding to the position of each shaft hole, and each through hole is communicated with each shaft hole;

[0010] A pivot unit includes two pivot shafts, which are made of plastic and are solid cylinders. Each pivot shaft is provided with a slot, wherein the depth of the slot extends from the periphery of the pivot shaft toward the center thereof, and the width of the slot expands outward from the center of the pivot shaft toward both sides. Each pivot shaft is passed through each through hole and each shaft hole, so that the cover body is pivoted on the base.

[0011] The bottom of the cover body is provided with a first containing groove, and a mirror is contained in the first containing groove.

[0012] The bottom of the base is provided with a second container for accommodating makeup pigments.

[0013] Each through hole has a first end away from the notch and a second end close to the notch, and the aperture of the first end is larger than that of the second end.

[0014] The cover body is provided with a first buckle portion extending downwardly from the other side of the periphery, and the periphery of the base is provided with a second buckle portion corresponding to the first buckle portion, and the first buckle portion is buckled with the second buckle portion.

[0015] The pivot shafts are manufactured by injection molding.

[0016] Wherein, the diameter of each pivot axis is less than 3.5 mm.

[0017] The diameter of each pivot shaft is larger than the diameter of each through hole and each shaft hole.

[0018] It can be seen from the above structure that the advantages of the present invention are as follows:

[0019] 1. Anti-deformation effect: Each of the pivot shafts of the present invention is provided with a slot, which can provide a margin space for the pivot shaft when it expands or contracts due to heat, so its diameter will hardly change due to thermal expansion or contraction. Therefore, no gap will be generated between each pivot shaft and each through hole and each shaft hole, so that the cover body can be maintained at any angle after opening without falling toward the base, thereby improving the convenience of use.

[0020] 2. Wide applicability: Since the size of each pivot shaft is equivalent to that of a conventional metal pin, it can be directly applied to the pivot connection of the lid and the base of an existing cosmetic box, and the nailing machine originally used for metal pins can be used for the push-nail assembly, without the need to develop a new nailing machine. Therefore, the plastic pivot shaft of the present invention has wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of a cosmetic box according to a preferred embodiment of the present invention.

[0022] Figure 2The figure is an exploded view of a cosmetic box according to a preferred embodiment of the present invention.

[0023] Figure 3 It is a three-dimensional diagram of the pivot shaft of the preferred embodiment of the present invention.

[0024] Figure 4 It is a front view of the pivot shaft of the preferred embodiment of the present invention.

[0025] Figure 5 It is a three-dimensional diagram of a base according to a preferred embodiment of the present invention.

[0026] Figure 6 It is a cross-sectional view of the combination of the cosmetic box and the pivot shaft according to the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0027] See also Figures 1 to 6 As shown, the present invention discloses a deformation-resistant plastic pivot shaft, which includes:

[0028] like Figure 1 and Figure 2 As shown, a cover body 10 is provided with a pivot portion 11 extending downward from one side of the periphery of the cover body 10, and an axial hole 111 is respectively penetrated at two axial ends of the pivot portion 11. A first buckle portion 12 is extended downward from the other side of the periphery of the cover body 10, and a first receiving groove 13 is provided at the bottom of the cover body 10, and the first receiving groove 13 is used to receive a mirror 14.

[0029] A base 20, which can be relatively covered with the cover body 10, a notch 21 is formed on the periphery of the base 20 corresponding to the position of the pivot portion 11, and a through hole 211 is respectively penetrated at both sides adjacent to the notch 21 and corresponding to the position of each shaft hole 111, each of the through holes 211 is communicated with each shaft hole 111, and each of the through holes 211 has a first end 212 away from the notch 21 and a second end 213 close to the notch 21, wherein the aperture of the first end 212 is larger than the aperture of the second end 213, a second buckling portion 22 is provided on the periphery of the base 20 corresponding to the position of the first buckling portion 12, and the first buckling portion 12 is buckled with the second buckling portion 22, and a second containing groove 23 is provided at the bottom of the base 20, and the second containing groove 23 can be used to accommodate makeup pigments, such as powder, eye shadow, etc. (not shown).

[0030] A pivot unit 30, the pivot unit 30 includes two pivot shafts 31, the pivot shafts 31 are made of plastic material and are generally solid cylinders, each of the pivot shafts 31 is respectively provided with a section groove 32, and is made by injection molding, wherein the depth of the section groove 32 is extended from the periphery of the pivot shaft 31 toward the center thereof, and the width of the section groove 32 is expanded outward from the center of the pivot shaft 31 toward both sides, so that the bottom of the section groove 32 is U-shaped, and each of the pivot shafts 31 is penetrated through each of the through holes 21 1 and each of the shaft holes 111, so that the cover body 10 is pivoted on the base 20, the diameter of each of the pivot shafts 31 is less than 3.5 mm, and the diameter of each of the pivot shafts 31 is slightly larger than the diameters of each of the through holes 211 and each of the shaft holes 11, so that after each of the pivot shafts 31 is penetrated through each of the through holes 211 and each of the shaft holes 111, a certain friction force can be generated between the cover body 10 and the surface of each of the pivot shafts 31 when it is opened, so that the cover body 10 can be maintained at any angle of opening without falling toward the base 20.

[0031] Among them, Figure 5 and Figure 6 As shown, since the hole diameter of the first end 212 is larger than the hole diameter of the second end 213, when each of the pivot shafts 31 passes through each of the through holes 211, it can be easily aligned and penetrated from the first end 212 of each of the through holes 211, and then directly inserted into each of the shaft holes 111 after passing through the second end 213.

[0032] See also Figure 2 , Figure 3 and Figure 4 As shown, each of the pivot shafts 31 of the present invention is respectively provided with the slot 32, and each of the slots 32 can provide a margin space for each of the pivot shafts 31 when it expands or contracts due to heat, and can avoid the volume of each of the pivot shafts 31 from expanding or contracting due to different temperatures. Therefore, its diameter will hardly change, so the through holes 211 and the shaft holes 111 will not be enlarged, so there will be no gap between each of the pivot shafts 31 and each of the through holes 211 and the shaft holes 111, so that the cover body 10 can be maintained at any angle after opening without falling toward the base 20, thereby improving the convenience of use. In addition, each of the pivot shafts 31 can also improve its telescopic performance due to the design of each of the slots 32, so that each of the pivot shafts 31 can be more easily inserted into each of the through holes 211 and the shaft holes 111.

[0033] In the above description, each of the pivot shafts 31 is designed with each of the slots 32 to achieve the effect of resisting deformation.

[0034] It is worth mentioning that, when assembling the cover and the base of a conventional cosmetic box, a nailing machine (not shown) is used to push a metal pin into the pivot hole fixed to the cover and the base, so that the cover is pivoted to the base. The size of each pivot shaft 31 of the present invention is less than 3.5 mm in diameter, and can directly replace the smaller metal pins of the conventional size. Therefore, when the cover 10 and the base 20 are assembled, the nailing machine can be used to push each pivot shaft 31 into each through hole 211 and each shaft hole 111 to complete the assembly, and there is no need to prepare another new nailing machine. Therefore, the plastic pivot shaft of the present invention has a wide range of applicability. Since the size of the pivot shafts 31 is relatively small, the structural size of the joints between the pivot shafts 31 and the cover 10 and the base 20 does not need to be too large, thereby improving the overall aesthetics and being applicable to most cosmetic boxes on the market.

Claims

1. A deformation-resistant plastic pivot shaft, characterized in that Include: A cover body, wherein a pivot portion is extended downwardly from one side of the periphery of the cover body, and an axial hole is respectively formed at two axial ends of the pivot portion; A base, which can be relatively covered with the cover body, a notch is formed on the periphery of the base corresponding to the pivotal portion, and a through hole is respectively formed on both sides adjacent to the notch and corresponding to the position of each shaft hole, and each through hole is communicated with each shaft hole; A pivot unit includes two pivot shafts, which are made of plastic and are solid cylinders. Each pivot shaft is provided with a slot, wherein the depth of the slot extends from the periphery of the pivot shaft toward the center thereof, and the width of the slot expands outward from the center of the pivot shaft toward both sides. Each pivot shaft is passed through each through hole and each shaft hole, so that the cover body is pivoted on the base.

2. The anti-deformation plastic pivot shaft according to claim 1, characterized in that: The bottom of the cover body is provided with a first containing groove, and the first containing groove contains a mirror.

3. The anti-deformation plastic pivot shaft according to claim 1, characterized in that: The bottom of the base is provided with a second containing groove for containing makeup pigments.

4. The anti-deformation plastic pivot shaft according to claim 1, characterized in that: Each through hole has a first end away from the notch and a second end close to the notch, and the aperture of the first end is larger than that of the second end.

5. The anti-deformation plastic pivot shaft according to claim 1, characterized in that: The cover body is provided with a first buckle portion extending downwardly from the other side of the periphery, and a second buckle portion is provided at the periphery of the base corresponding to the first buckle portion, and the first buckle portion is buckled with the second buckle portion correspondingly.

6. The anti-deformation plastic pivot shaft according to claim 1, characterized in that: The pivot shafts are made by injection molding.

7. The anti-deformation plastic pivot shaft according to claim 1, characterized in that: The diameter of each pivot shaft is less than 3.5 mm.

8. The anti-deformation plastic pivot shaft according to claim 1, characterized in that: The diameter of each pivot shaft is larger than the diameter of each through hole and each shaft hole.

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