Improved automatic spring clip

Abstract

This invention provides an improved automatic spring-loaded clamp, characterized by: having a first clamp body, a second clamp body, and a helical clutch shaft; the first and second clamp bodies are arranged correspondingly to each other and can rotate relative to each other to jointly clamp an item; the helical clutch shaft is pivotally disposed between the first and second clamp bodies, providing an elastic force for the first and second clamp bodies to automatically spring open; the helical clutch shaft has a first and second shaft, a cover, an elastic telescopic torsion element, and a shaft; the connection points between the first clamp body and the first shaft, and between the second clamp body and the second shaft, are provided with a mechanism for connecting to the corresponding first and second shafts. The wing-shaped parts are positioned in conjunction with the first and second slots, and the first clamping body corresponds to the second baffle, and the second clamping body corresponds to the first baffle. First and second pressing pieces are provided. At least one first and second locking block is protruding from the inner side of each slot. Each wing-shaped part is provided with a first and second locking hole corresponding to the corresponding locking block. When the user presses the first and second clamping bodies at the same time, the spiral clutch shaft can perform a multi-stage closing clamping operation. When the user presses both ends of the spiral clutch shaft at the same time, the aforementioned elastic telescopic torsion element can make the first and second clamping bodies automatically spring open.

Description

[Improved Automatic Spout Clip] Technical Field

[0001] This invention relates to a spring-loaded hair clip structure, and more particularly to an improved automatic spring-loaded hair clip that is easy to use. Prior Technology

[0002] A traditional hair clip consists of a left clip, a right clip, a pivot, and a torsion spring. The torsion spring holds the left and right clips tightly together. To use it, you must press the non-clamping side of the left and right clips with two fingers to open them and clamp the hair. To remove the hair clip from the hair, you must press the non-clamping side again to separate the left and right clips, allowing you to remove the hair clip from the hair.

[0003] Although it is simple to use, it is quite difficult to operate. A large amount of pressure must be applied to open the left and right clamps, and the clamping force cannot be adjusted, which can easily damage the hair.

[0004] In addition, the connection between the left and right clamps and the shaft seat is mostly done with glue, which limits the modularity and makes subsequent maintenance or modification difficult.

[0005] In view of this, how to provide an improved automatic spring clip that can solve the aforementioned problems has become the subject of this new invention. Summary of the Invention

[0006] The purpose of this invention is to provide an improved automatic spring-loaded clip that is easier to apply, maintain, and modify.

[0007] To solve the above problems and achieve the purpose of this invention, the technical means of this invention is as follows: An improved automatic spring-loaded clip, characterized in that: the improved automatic spring-loaded clip has a first clamping body, a second clamping body, and a helical clutch shaft; the first clamping body and the second clamping body are arranged correspondingly to each other and can rotate relative to each other to jointly clamp an item; the helical clutch shaft is pivotally disposed between the first clamping body and the second clamping body, providing elastic force for the first clamping body and the second clamping body to automatically spring open; the helical clutch shaft has a first shaft, a second shaft, a cover, an elastic telescopic torsion element, and a shaft; one side of the first shaft is connected to the first clamping body, and a first... The first clamp has a baffle, a first helical rack, and a guide portion. A first wing portion is provided at the connection point with the first clamp. One side of the second shaft is connected to the second clamp. A second baffle, a spacer, a second helical rack, and a sleeve are sequentially arranged along the axial direction. A second wing portion is provided at the connection point with the second clamp. The second baffle is located outside the first baffle and serves to restrict the first baffle. The spacer accommodates the first baffle and the first helical rack, allowing them to move axially within it. The first tooth of the first helical rack is located on the side of the first shaft away from the first wing portion. The second tooth of the second helical rack is located on the side of the second shaft away from the second wing portion. The first tooth and the second tooth are corresponding to each other and can mesh with each other; the cover is located at the free end of the guide portion, corresponding to the sleeve and able to be fitted onto it, and one side corresponds to the free end of the first wing portion, and is provided with a third wing portion that can be positioned on the first wing portion; the elastic telescopic torsion element is located between the sleeve and the cover, with its two ends abutting against the sleeve and the cover respectively, so as to use elasticity to provide meshing force between the first helical rack and the second helical rack, so that when pressed, the helical clutch shaft can produce a disengagement function; the shaft passes through the first baffle, the second baffle and over the spacer portion and the second helical rack, and is positioned at the top of the sleeve. The first clamping body and the first shaft are connected at one end, where a first slot is provided to engage with and position the first wing portion. The first clamping body, corresponding to the second baffle, is also provided with a first pressing piece. The second clamping body and the second shaft are connected at one end, where a second slot is provided to engage with and position the second wing portion. The second clamping body, corresponding to the cover, is also provided with a second pressing piece. At least one first locking block for positioning and connecting the first wing portion is also protruding from the inner side of the first slot. At least one second locking block for positioning and connecting the second wing portion is also protruding from the inner side of the second slot. The first wing portion, corresponding to the first locking block, is provided with a first locking hole for engaging and locking with the first locking block.The second wing section, corresponding to the second locking block, is provided with a second locking hole that can engage with the second locking block.

[0008] More preferably, the inner bottom surface of the sleeve corresponding to the elastic telescopic torsion element is further provided with a first fastening groove for positioning and connecting the corresponding end of the elastic telescopic torsion element; the inner bottom surface of the sleeve corresponding to the elastic telescopic torsion element is further provided with a second fastening groove for positioning and connecting the corresponding end of the elastic telescopic torsion element.

[0009] More preferably, the elastic telescopic torsion element is provided with a torsion part at the positioning connection between it and the first and second snap-fit ​​grooves, and the torsion part can rotate synchronously with the corresponding first and second snap-fit ​​grooves.

[0010] More preferably, a first engaging portion is recessed at the positioning connection between the first wing portion and the third wing portion, and the third wing portion is also provided with a second engaging portion corresponding to the first engaging portion, which can be positioned and connected with the first engaging portion.

[0011] More preferably, the first engaging portion is provided with at least one positioning hole on one side corresponding to the second engaging portion; and the second engaging portion is provided with a positioning block that can be engaged into the positioning hole at the location corresponding to the positioning hole.

[0012] More preferably, both the first and second card blocks are hook-shaped; and the cross-sections of both the first and second card holes are hook-shaped.

[0013] Compared with the prior art, the advantages of this new technology are as follows:

[0014] Firstly, in this new type of hair clip, when removing the hair clip from the hair, simply press both sides of the spiral clutch shaft to automatically open and separate the first and second clips, making it very convenient to remove the hair clip.

[0015] Secondly, in this new type of device, when clamping hair, simply close the first clamp and the second clamp to clamp the hair. The force is adjustable through the spiral clutch shaft, making it very convenient to use.

[0016] Thirdly, in this new type of clutch shaft, which is composed of a first shaft, a second shaft, a cover, an elastic telescopic torsion element and a shaft, the structure is modular, which can effectively engage and disengage. During use, it will not accidentally pop open, making it easier to clamp and automatically pop open, which is very convenient and labor-saving.

[0017] Fourthly, in this new invention, the modular design of the first and second slots facilitates the connection between the first and second clamping bodies and the helical clutch shaft. The first and second pressing plates not only facilitate pressing operations but also limit the position of the helical clutch shaft. Simultaneously, the first and second locking blocks, in conjunction with the first and second locking holes, allow the first and second wing portions to quickly and securely connect to the first and second clamping bodies, respectively, without the need for other connecting materials. This approach is both environmentally friendly and further reduces costs. Moreover, the overall modularity is excellent, making subsequent maintenance or modification operations simpler. Simple Explanation of the Diagram

[0018] [Figure 1] is a three-dimensional schematic diagram of the present invention.

[0019] [Figure 2] is a three-dimensional exploded view of Figure 1.

[0020] [Figure 3] is a three-dimensional exploded view of Figure 1 from another perspective.

[0021] [Figure 4] is a cross-sectional view of part A in Figure 1.

[0022] [Figure 5] is a three-dimensional exploded view of the spiral clutch shaft in this novel invention.

[0023] [Figure 6] is a three-dimensional exploded schematic diagram of the spiral clutch shaft in this novel invention from another perspective.

[0024] [Figure 7] is a three-dimensional schematic diagram of the present invention when it is to be closed.

[0025] [Figure 8] is a schematic rear side view of the implementation of the spiral clutch shaft of this novel invention when it is closed.

[0026] [Figure 9] is a three-dimensional schematic diagram of the present invention when it is to automatically pop open.

[0027] [Figure 10] is a rear side view illustrating the implementation of the automatic release of the spiral clutch shaft in this new type of clutch. Implementation

[0028] The following is a detailed description of the embodiments shown in the figures: As shown in Figures 1 to 10, an improved automatic spring-loaded clip is characterized in that: the improved automatic spring-loaded clip 100 has a first clamping body 1, a second clamping body 2, and a spiral clutch shaft 3; the first clamping body 1 and the second clamping body 2 are arranged correspondingly to each other and can rotate relative to each other to jointly clamp an item; the spiral clutch shaft 3 is pivotally disposed between the first clamping body 1 and the second clamping body 2, and can provide the elastic force for the first clamping body 1 and the second clamping body 2 to automatically spring open; the spiral clutch shaft 3 has a first shaft 31, a second shaft 32, a cover 33, an elastic telescopic torsion element 34, and a shaft 35; the first One side of the shaft 31 is connected to the first clamp 1. A first baffle 311, a first helical rack 312, and a guide portion 313 are sequentially arranged in the axial direction. A first wing portion 314 is provided at the connection point with the first clamp 1. One side of the second shaft 32 is connected to the second clamp 2. A second baffle 321, a spacer portion 322, a second helical rack 323, and a sleeve 324 are sequentially arranged in the axial direction. A second wing portion 325 is provided at the connection point with the second clamp 2. The second baffle 321 is located outside the first baffle 311 and is used to restrict the first baffle 311. The spacer portion 322 can accommodate the first baffle 311 and the first helical rack 312, allowing them to... The device can move axially within it; the first tooth 3121 of the first helical rack 312 is located on the side of the first shaft 31 away from the first wing portion 314; the second tooth 3231 of the second helical rack 323 is located on the side of the second shaft 32 away from the second wing portion 325; the first tooth 3121 and the second tooth 3231 are corresponding to each other and can mesh with each other; the cover 33 is located at the free end of the guide portion 313, corresponding to the sleeve 324 and can be fitted onto it, and on one side corresponding to the free end of the first wing portion 314, a third wing portion 331 that can be positioned on the first wing portion 314 is provided; the elastic telescopic torsion element 34 is located on the sleeve 313. Within the space between 24 and the cover 33, both ends abut against the sleeve 324 and the cover 33 respectively, so as to provide meshing force between the first helical rack 312 and the second helical rack 323 using elastic force, so that the helical clutch shaft 3 can engage and disengage when pressed; the shaft 35 passes through the first baffle 311, the second baffle 321 and over the spacer 322 and the second helical rack 323, and is positioned at the top of the sleeve 324; at the connection between the first clamp 1 and the first shaft 31, a first slot 11 is provided that can cooperate with the first wing portion 314 for positioning, and the first clamp 1 is also provided with a first pressing piece 12 corresponding to the second baffle 321;At the connection between the second clamping body 2 and the second shaft 32, a second slot 21 is provided for positioning and engaging with the second wing portion 325. Corresponding to the cover 33, the second clamping body 2 also has a second pressing piece 22. At least one first locking block 10 for positioning and connecting the first wing portion 314 is protruding from the inner side of the first slot 11. At least one second locking block 20 for positioning and connecting the second wing portion 325 is protruding from the inner side of the second slot 21. Corresponding to the first locking block 10, the first wing portion 314 has a first locking hole 30 for engaging and engaging with the first locking block 10. Corresponding to the second locking block 20, the second wing portion 325 has a second locking hole 40 for engaging and engaging with the second locking block 20.

[0029] The first clamp 1 and the second clamp 2 are clamping structures, as shown in Figure 1. They are mainly used to clamp hair and are made of various hard or elastic materials such as plastic, rubber, wood, ceramic, and metal. By changing the materials, the applicability of this invention can be improved. For example, when made of hard materials such as metal, ceramic, or wood that are not easily deteriorated or damaged, the durability and shape variation of this invention can be improved. When made of elastic materials such as plastic or rubber, the hair can be protected.

[0030] Secondly, because the first helical rack 312 and the second helical rack 323 move in a stepped forward manner, combined with the elastic force of the elastic torsion element 34, the clamping process of this new type is very smooth and easy to operate, and there is no jamming. As shown in Figures 7 and 8, when the user releases the clamp, the reaction force or elastic force generated by the clamped object will push the first clamp 1 and the second clamp 2 apart in the opposite direction. The stepped structure of the helical clutch shaft 3 will generate a very strong resistance to reverse movement when subjected to the thrust of reverse movement. The resistance to reverse movement comes from the structural characteristics of the first helical rack 312 and the second helical rack 323 and the elastic force of the elastic torsion element 34, so as to prevent the helical clutch shaft 3 from disengaging. The tighter the clamping, the more meshing parts there are, and the greater the resistance to reverse movement. In this way, the helical clutch shaft 3 can have the best meshing force and anti-disengagement effect.

[0031] Furthermore, the modular design of the first slot 11 and the second slot 21 facilitates the connection of the first clamp 1, the second clamp 2, and the spiral clutch shaft 3. The first pressing piece 12 and the second pressing piece 22 not only facilitate pressing but also restrict the position of the spiral clutch shaft 3. The first locking block 10 and the second locking block 20, together with the first locking hole 30 and the second locking hole 40, allow the corresponding first wing portion 314 to connect to the first clamp 1 and the second wing portion 325 to connect to the second clamp 2, quickly and securely connecting the first clamp 1, the second clamp 2, and the spiral clutch shaft 3. This eliminates the need for other connecting materials, making it more environmentally friendly, further reducing costs, improving modularity, and simplifying subsequent maintenance or modifications.

[0032] In addition, the elastic telescopic torsion element 34 is encased in the sleeve 324 and the cover 33, isolating it from the outside and reducing the impact of external factors (hair, water, hairspray and other contaminants), thus achieving the effects of aesthetics and protection.

[0033] Furthermore, although the first clamp 1 and the second clamp 2 are not shown in the figure, decorative structures, such as rhinestones, reliefs, or prints, can be set at any position on the outer surface of both.

[0034] As shown in Figures 7 and 8, when using this new type of device, only the two sides of the first clamping body 1 and the second clamping body 2 need to be pressed to gradually rotate and clamp. The user can control the degree of pressing and clamping according to their needs. At this time, the part of the elastic telescopic torsion element 34 is shown in Figure 5. Although it is not shown in Figures 7 and 8, the torsion parts 341 at both ends of the elastic telescopic torsion element 34 will be compressed. The rebound force of the middle part of the elastic telescopic torsion element 34 will automatically press the spiral clutch shaft 3. The first spiral rack 312 and the second spiral rack 323 can mesh with each other for positioning and prevent being pried open by the reverse elastic force of the torsion parts 341 at both ends of the elastic telescopic torsion element 34 and the reverse force of the clamped item, thus completing the clamping operation.

[0035] As shown in Figures 9 and 10, when the user wants to remove this new type of device, they only need to press the first pressing piece 12 and the second pressing piece 22 to separate the first helical rack 312 and the second helical rack 323 (disengage the teeth). At this time, referring to Figure 5, although not shown in Figures 9 and 8, the middle part of the elastic telescopic torsion element 34 will be compressed, and the reverse elastic force of the torsion parts 341 at both ends of the elastic telescopic torsion element 34 will cause the spiral clutch shaft 3 to automatically spring open, driving the first clamp 1 and the second clamp 2 to complete the opening operation.

[0036] Referring to Figures 1 to 4, both the first card block 10 and the second card block 20 are barbed; the cross-sections of both the first card hole 30 and the second card hole 40 are barbed.

[0037] Among them, the first hook-shaped locking block 10 and the second hook-shaped locking block 20 are used to cooperate with the first hook-shaped locking hole 30 and the second hook-shaped locking hole 40. Through the simplest geometric structure, a complex mechanical function is achieved. The hook-shaped structure can hook tightly, making the connection more stable. The elastic deformation of the material is used to achieve efficient fastening and precise positioning, realize a fast and stable mechanical connection, and reduce energy consumption and carbon emissions in the assembly process.

[0038] Referring to Figure 5, the inner bottom surface of the sleeve 324 corresponding to the elastic telescopic torsion element 34 is further provided with a first fastening groove 3241 for positioning and connecting the corresponding end of the elastic telescopic torsion element 34; the inner bottom surface of the sleeve 324 corresponding to the elastic telescopic torsion element 34 is further provided with a second fastening groove 332 for positioning and connecting the corresponding end of the elastic telescopic torsion element 34.

[0039] The application of the first snap-fit ​​groove 3241 and the second snap-fit ​​groove 332 enables a stable connection of the elastic telescopic torsion element 34, allowing the elastic telescopic torsion element 34 to extend, retract, and torsion smoothly, and to operate normally under the design.

[0040] Referring to Figure 5, at the positioning connection points of the elastic telescopic torsion element 34 with the first fastening groove 3241 and the second fastening groove 332, a torsion part 341 is also provided, which can rotate synchronously with the corresponding first fastening groove 3241 and the second fastening groove 332.

[0041] The torsion part 341 allows the elastic telescopic torsion element 34 to extend, retract, and torsion smoothly, providing elastic force to the spiral clutch shaft 3, realizing the clutch function, and preventing tooth dislodgement.

[0042] Referring to Figures 5 and 6, a first engaging portion 315 is recessed at the positioning connection between the first wing portion 314 and the third wing portion 331, and the third wing portion 331 is also provided with a second engaging portion 333 that can be positioned and connected with the first engaging portion 315 at the corresponding location of the first engaging portion 315.

[0043] The first engaging part 315 and the second engaging part 333 cooperate to ensure a stable fit between the first wing part 314 and the third wing part 331, making assembly easier and reducing the defect rate.

[0044] Referring to Figure 5, the first engaging portion 315 is provided with at least one positioning hole 316 on one side corresponding to the second engaging portion 333; and the second engaging portion 333 is provided with a positioning block 334 that can be engaged into the positioning hole 316 at the location corresponding to the positioning hole 316.

[0045] The positioning hole 316 and the positioning block 334 work together to ensure that the first engaging part 315 can be properly engaged with the second engaging part 333, which can prevent mistakenly, quickly position and engage, and avoid slippage.

[0046] The above description details the structure, features, and effects of this invention based on the embodiments shown in the drawings. However, the above description is only a preferred embodiment of this invention, but the scope of implementation of this invention is not limited to what is shown in the drawings. Therefore, any modifying changes that are consistent with the intent of this invention should be included within the scope of this invention's patent, as long as they have equivalent effects.

[0047] 1: First clamp

[0048] 11: First Card Slot

[0049] 12: First press tablet

[0050] 2: Second clamp

[0051] 21: Second card slot

[0052] 22: Second pressing tablet

[0053] 3: Spiral clutch shaft

[0054] 31: First axis

[0055] 311: First baffle

[0056] 312: First helical rack

[0057] 3121: First tooth

[0058] 313: Guidance Department

[0059] 314: First Wing Section

[0060] 315: First Card Section

[0061] 316: Positioning hole

[0062] 32: Second axis

[0063] 321: Second baffle

[0064] 322: Spacing section

[0065] 323: Second helical rack

[0066] 3231: Second tooth

[0067] 324: Sleeve

[0068] 3241: First snap-fit ​​groove

[0069] 325: Second Wing Section

[0070] 33: Cover

[0071] 331: Third Wing Section

[0072] 332: Second snap-fit ​​groove

[0073] 333: Second Card Combination

[0074] 334: Positioning Card Block

[0075] 34: Elastic telescopic torsion element

[0076] 35: Axis

[0077] 100: Improved automatic spring-loaded clip

[0078] 10: First Card Block

[0079] 20: Second Card Block

[0080] 30: First slot

[0081] 40: Second card slot

Claims

1. An improved automatic spring-loaded clip, characterized in that: the improved automatic spring-loaded clip (100) has a first clamping body (1), a second clamping body (2), and a helical clutch shaft (3); the first clamping body (1) and the second clamping body (2) are arranged correspondingly to each other and can rotate relative to each other to jointly clamp an item; the helical clutch shaft (3) is pivotally disposed between the first clamping body (1) and the second clamping body (2) and can provide an elastic force for the first clamping body (1) and the second clamping body (2) to automatically spring open; the helical clutch shaft (3) has a first shaft (31), a second shaft (32), a cover (33), and an elastic telescopic torsion element (34). And a shaft (35); one side of the first shaft (31) is connected to the first clamp (1), and a first baffle (311), a first helical rack (312), and a guide (313) are arranged sequentially in the axial direction, and a first wing portion (314) is provided at the connection with the first clamp (1); one side of the second shaft (32) is connected to the second clamp (2), and a second baffle (321), a spacer (322), a second helical rack (323), and a sleeve (324) are arranged sequentially in the axial direction, and a second wing portion (325) is provided at the connection with the second clamp (2); the second baffle (321) is located at the first baffle (311) The outer side is used to restrict the first baffle (311); the spacer (322) is used to accommodate the first baffle (311) and the first helical rack (312), so that both can move axially within it; the first tooth (3121) of the first helical rack (312) is provided on the side of the first shaft (31) away from the first wing portion (314); the second tooth (3231) of the second helical rack (323) is provided on the side of the second shaft (32) away from the second wing portion (325); the first tooth (3121) and the second tooth (3231) are corresponding to each other and can mesh with each other; the cover The body (33) is located at the free end of the guide portion (313), corresponding to the sleeve (324) and can be fitted onto it. One side corresponds to the free end of the first wing portion (314), and a third wing portion (331) is provided that can be positioned on the first wing portion (314). The elastic telescopic torsion element (34) is located between the sleeve (324) and the cover (33), with both ends abutting against the sleeve (324) and the cover (33) respectively, so as to provide the meshing force between the first helical rack (312) and the second helical rack (323) by using elastic force, so that when pressed, the helical clutch shaft (3) can produce a disengagement function.The shaft (35) passes through the first baffle (311), the second baffle (321), and over the spacer (322) and the second helical rack (323), and is positioned at the top of the sleeve (324); at the connection between the first clamping body (1) and the first shaft (31), a first slot (11) is provided that can cooperate with the first wing portion (314) for positioning, and at the location corresponding to the second baffle (321) of the first clamping body (1), a first pressing piece (12) is also provided; at the connection between the second clamping body (2) and the second shaft (32), a second slot (21) is provided that can cooperate with the second wing portion (325) for positioning, and at the location corresponding to the second baffle (321) of the second clamping body (2) for positioning, a second pressing piece (21) is provided that can cooperate with the second wing portion (325) for positioning, and at the location corresponding to the second baffle (324) of the second clamping body (2) for positioning, a first pressing piece (12) is also provided. At the cover (33), a second pressing piece (22) is also provided; at least one first locking block (10) for positioning and connecting the first wing portion (314) is also provided on the inner side of the first slot (11); at least one second locking block (20) for positioning and connecting the second wing portion (325) is also provided on the inner side of the second slot (21); corresponding to the first locking block (10), the first wing portion (314) is provided with a first locking hole (30) that can engage with the first locking block (10); corresponding to the second locking block (20), the second wing portion (325) is provided with a second locking hole (40) that can engage with the second locking block (20).

2. The improved automatic spring-loaded clip as described in claim 1, wherein: The inner bottom surface of the sleeve (324) corresponding to the elastic telescopic torsion element (34) is further provided with a first fastening groove (3241) for positioning and connecting the corresponding end of the elastic telescopic torsion element (34); the inner bottom surface of the sleeve (324) corresponding to the elastic telescopic torsion element (34) is further provided with a second fastening groove (332) for positioning and connecting the corresponding end of the elastic telescopic torsion element (34).

3. The improved automatic spring-loaded clip as described in claim 2, wherein: At the positioning connection points of the elastic telescopic torsion element (34) with the first snap-fit ​​groove (3241) and the second snap-fit ​​groove (332), a torsion part (341) is also provided, and the torsion part (341) can rotate synchronously with the corresponding first snap-fit ​​groove (3241) and second snap-fit ​​groove (332).

4. The improved automatic spring-loaded clip as described in claim 3, wherein: At the positioning connection between the first wing portion (314) and the third wing portion (331), a first engaging portion (315) is recessed, and the third wing portion (331) is also provided with a second engaging portion (333) that can be positioned and connected with the first engaging portion (315) at the corresponding location of the first engaging portion (315).

5. The improved automatic spring-loaded clip as described in claim 4, wherein: The first engaging portion (315) is provided with at least one positioning hole (316) on one side corresponding to the second engaging portion (333); and the second engaging portion (333) is provided with a positioning block (334) that can be engaged into the positioning hole (316) at the location of the positioning hole (316).

6. The improved automatic spring-loaded clip as described in claim 5, wherein: Both the first card block (10) and the second card block (20) are barbed; the cross-sections of both the first card hole (30) and the second card hole (40) are barbed.