Deformation-resistant plastic pivot shaft

Abstract

A deformation-resistant plastic pivot shaft, comprising a cover, a base, and a pivot unit. The cover is provided with a pivot part; shaft holes are respectively formed in and penetrate two axial ends of the pivot part; a notch is formed in the base at the position corresponding to the pivot part, and through holes are respectively formed at and penetrate the positions which are close to two sides of the notch and respectively correspond to the shaft holes; the pivot unit comprises two pivot shafts; the pivot shafts are generally solid cylinders; a cut groove is formed in each pivot shaft; each pivot shaft passes through a corresponding through hole and shaft hole; and each cut groove can provide a margin space for thermal expansion and contraction of a corresponding pivot shaft. Because the diameter of each pivot shaft hardly changes, no gap is generated between each pivot shaft and the corresponding shaft hole, so that a certain friction force can be generated between the cover when opened and the surface of each pivot shaft , and the cover can be maintained at any angle when opened without falling towards the base, thereby improving the use convenience.

Description

Deformation-resistant plastic pivot Technical Field

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

[0002] Conventional cosmetic cases consist of a plastic lid and base, each with a pivot hole and secured together with a metal pin. Consumers typically recycle the entire cosmetic case after use. However, due to the material differences, recyclers must first remove the pin and recycle it separately, preventing it from being recycled along with the plastic lid and base. This can damage recycling equipment and cause problems for recyclers.

[0003] In view of this, the applicant has developed a plastic pin pivotally mounted on the lid and base of a cosmetic box and its application to address the above-mentioned shortcomings. The pin replaces the above-mentioned metal pin with a plastic pin. Since the pin, lid, and base are all made of plastic, they can be recycled as a whole, thus solving 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 pin expands, and the pivot hole that penetrates the lid and the base is also enlarged by the pin. When the temperature returns to normal, the volume of the pin returns to its original state, but the pivot hole has been expanded and shaped. Therefore, a gap is generated between the pin and the pivot hole, and effective friction with the lid cannot be generated. As a result, the lid cannot be maintained at any specific angle when opened, causing inconvenience in use.

[0005] Therefore, based on 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 to achieve the above-mentioned goals. The shaft can completely solve or effectively improve many of the shortcomings of conventional products.

[0006] Summary of the Invention

[0007] The object of the present invention is to provide a deformation-resistant plastic pivot shaft, which has a simple structure and is easy to operate and maintain, and can solve or effectively improve many shortcomings of conventional ones.

[0008] To achieve the above objectives, the present invention discloses a deformation-resistant plastic pivot shaft, which is characterized by comprising:

[0009] A cover body, wherein a pivot portion is provided downwardly extending from one side of the periphery of the cover body, and an axial hole is respectively provided at both axial ends of the pivot portion;

[0010] A base, which can be engaged with the cover body, has a notch formed on the periphery of the base corresponding to the pivot portion, and has a through-hole formed on both sides adjacent to the notch and corresponding to the position of each shaft hole, each through-hole communicating with each shaft hole;

[0011] A pivot unit includes two pivot shafts, which are made of plastic and are solid cylinders. Each pivot shaft has a slot, wherein the depth of the slot extends from the periphery of the pivot shaft toward its center, and the width of the slot expands outward from the center of the pivot shaft toward both sides. Each pivot shaft is inserted into each through hole and each shaft hole, so that the cover body is pivoted on the base.

[0012] The bottom of the cover is provided with a first receiving groove, and the first receiving groove receives a mirror.

[0013] The bottom of the base is provided with a second container for accommodating makeup pigments.

[0014] 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.

[0015] The cover body is provided with a first buckle portion extending downward 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 correspondingly buckled with the second buckle portion.

[0016] The pivot shafts are manufactured by injection molding.

[0017] The diameter of each pivot shaft is less than 3.5 mm.

[0018] The diameter of each pivot shaft is larger than the diameter of each through hole and each shaft hole.

[0019] As can be seen from the above structure, the advantages of the present invention are as follows:

[0020] 1. Anti-deformation effect: Each of the pivot shafts of the present invention is provided with a respective slot, which can provide a margin space for each pivot shaft when it expands and contracts due to heat. Therefore, its diameter is hardly affected by thermal expansion and contraction. Therefore, there is no gap between each pivot shaft and each through-hole and each shaft hole. After the cover is opened, it can be maintained at any angle without falling toward the base, thereby improving the convenience of use.

[0021] 2. Wide applicability: Since the dimensions of each pivot shaft are equivalent to conventional metal pins, they can be directly applied to the pivot joint of the lid and base of an existing cosmetic case. Furthermore, the nailing machine originally used for metal pins can be used for pushing the nails for assembly, without the need for a new nailing machine. Therefore, the plastic pivot shaft of the present invention has a wide range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a perspective view of a cosmetic box according to a preferred embodiment of the present invention.

[0023] FIG2 is an exploded view of a cosmetic case according to a preferred embodiment of the present invention.

[0024] FIG3 is a perspective view of the pivot shaft according to a preferred embodiment of the present invention.

[0025] FIG. 4 is a front view of the pivot shaft according to the preferred embodiment of the present invention.

[0026] FIG5 is a perspective view of a base according to a preferred embodiment of the present invention.

[0027] FIG6 is a cross-sectional view of the combination of the cosmetic case and the pivot shaft according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0028] Referring to Figures 1 to 6 , the present invention discloses a deformation-resistant plastic pivot shaft, which includes:

[0029] As shown in Figures 1 and 2, 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 both ends of the axial direction 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 provided for accommodating a mirror 14.

[0030] A base 20, which can be relatively covered with the cover body 10, has a notch 21 formed on the periphery of the base 20 corresponding to the position of the pivot portion 11, and a through-hole 211 is respectively formed on both sides of 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, and 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 correspondingly buckled with the second buckling portion 22. In addition, a second receiving groove 23 is provided at the bottom of the base 20, and the second receiving groove 23 can be used to accommodate makeup pigments, such as powder, eye shadow, etc. (not shown).

[0031] A pivot unit 30, the pivot unit 30 includes two pivot shafts 31, the pivot shafts 31 are made of plastic and are generally solid cylinders, each of the pivot shafts 31 is provided with a slot 32, and is made by injection molding, wherein the depth of the slot 32 is extended from the periphery of the pivot shaft 31 toward the center thereof, and the width of the slot 32 is expanded outward from the center of the pivot shaft 31 toward both sides, so that the bottom of the slot 32 is U-shaped, each of the pivot shafts 31 is passed through each of the through holes 21 1 and each of the axis holes 111, so that the cover 10 is pivoted on the base 20. The diameter of each pivot axis 31 is less than 3.5 mm, and the diameter of each pivot axis 31 is slightly larger than the diameter of each through hole 211 and each of the axis holes 11. After each of the pivot axis 31 is inserted into each of the through holes 211 and each of the axis holes 111, a certain friction force can be generated between the cover 10 and the surface of each of the pivot axis 31 when the cover 10 is opened, so that the cover 10 can be maintained at any opening angle without falling toward the base 20.

[0032] As shown in FIG5 and FIG6 , since the aperture of the first end 212 is larger than the aperture of the second end 213 , when each pivot shaft 31 is inserted into each through hole 211 , it can be easily aligned and inserted through the first end 212 of each through hole 211 , and then directly inserted into each shaft hole 111 after passing through the second end 213 .

[0033] 2 , 3 and 4 , each of the pivot shafts 31 of the present invention is provided with a slot 32 , and each of the slots 32 can provide a margin space for each of the pivot shafts 31 when it expands and contracts due to heat, and can avoid the volume of each of the pivot shafts 31 from expanding and contracting due to different temperatures. Therefore, its diameter hardly changes, so the through-holes 211 and the shaft holes 111 will not be expanded. Therefore, no gap will be generated 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.

[0034] In the above description, each pivot shaft 31 is designed with each slot 32 to achieve the effect of resisting deformation.

[0035] It is worth mentioning that, when the lid and base of a traditional cosmetic box are assembled, a nailing machine (not shown) is used to push metal pins into the pivot holes fixed to the lid and the base, so that the lid 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 conventional metal pins of smaller size. Therefore, when the lid 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, without the need to additionally develop another new nailing machine. Therefore, the plastic pivot shaft of the present invention has a wide range of applicability. Moreover, since the size of the pivot shafts 31 is relatively small, the structural size of the joints between the pivot shafts 31 and the lid 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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