Composite clutch device

Abstract

The compound clutch device according to the present invention comprises: a rotating block having an upwardly extending central shaft and an upwardly inclined boss surrounding a lower portion of the central shaft and spaced apart from the central shaft by a certain distance; the C-shaped plate spring surrounds the periphery of the upward inclined convex part and is elastically and tightly contacted with the outer surface of the upward inclined convex part; the clutch gear is provided with a downwards-inclined protruding part and a stop protrusion, when the upwards-inclined protruding part is inserted downwards, the downwards-inclined protruding part is arranged between the center shaft and the upwards-inclined protruding part in a press fit mode, and the stop protrusion is inserted between the two longitudinal end parts of the C-shaped plate spring; and an elastic body fixedly coupled to the central shaft and applying a downward elastic force to an upper surface of the clutch gear. The compound clutch device of the present invention can generate a large clutch force even when a product is miniaturized, since the clutch force is generated by various parts, the element for generating the clutch force can be manufactured by using various materials, and the compound clutch device has the advantages of reducing manufacturing cost and improving design freedom.

Description

Technical Field

[0001] The present disclosure relates to a clutch device for transmitting power, and more particularly, to a composite clutch device, in which components for transmitting and blocking power are configured in multiple stages, thereby significantly increasing the clutch force generated within limited specifications, and can be made of multiple types of materials, thereby increasing the design freedom of the product. Background Art

[0002] The fuel inlet or charging port of a vehicle usually adopts a cover driving device to automatically open and close the corresponding cover. The cover driving device includes a driving motor, a clutch having an output end connected to the cover rotating shaft, and a reducer located between the driving motor and the clutch to be connected thereto.

[0003] The disadvantage of the conventional cover driving device is that, due to the low transmission efficiency of the reducer, the energy consumption of the driving motor needs to be increased to effectively drive the cover. In addition, the conventional cover driving device has a complex internal structure and large component size, making it difficult to miniaturize the cover driving device.

[0004] Meanwhile, when the cover is configured to be rotated by a drive motor, the rotation axis of the cover is usually connected to the drive shaft of the drive motor through a gear coupling structure. In this case, there are the following disadvantages: the cover cannot be opened and closed manually from the outside of the vehicle, and when the rotation force output by the drive motor is too large, the cover may be damaged.

[0005] In order to solve this problem, a clutch device has been proposed, which prevents excessive power transmission to automatically open and close the cover and to manually open and close the cover.

[0006] Next, a conventional clutch device will be described in detail.

[0007] Figure 1 It is an exploded perspective view of a conventional clutch device.

[0008] like Figure 1 As shown, the conventional clutch device comprises: a rotating block 10 having a central shaft 12 extending upward; a clutch gear 20 into which the central shaft 12 is inserted; a clutch plate 30 located on the clutch gear 20 and rotating integrally with the central shaft 12; a stopper 40 coupled to one end of the central shaft 12; and a spring 50 compressed between the clutch plate 30 and the stopper 40 and elastically pressing the clutch plate 30 toward the clutch gear 20. When a rotational force is applied to the clutch gear 20, due to the friction between the clutch gear 20 and the clutch plate 30, the clutch plate 30 rotates together with the clutch gear 20, and the rotating block 10 coupled to the clutch plate 30 also rotates.

[0009] In this case, if the force fixing the rotating block 10 is small, when the clutch gear 20 rotates, the clutch plate 30 rotates with the clutch gear 20 due to the friction between the clutch gear 20. However, when the force fixing the rotating block 10 is greater than the friction between the clutch gear 20 and the clutch plate 30, even if the clutch gear 20 rotates, the clutch plate 30 slides on the clutch gear 20, and the clutch plate 30 and the rotating block 10 coupled thereto do not rotate.

[0010] In order to make the clutch gear 20 and the clutch plate 30 rotate as a whole, the friction between the clutch gear 20 and the clutch plate 30 needs to be large, so the clutch gear 20 and the clutch plate 30 need to be made of a material with a high friction coefficient. However, since materials with a high friction coefficient are usually expensive, there is a problem of increased manufacturing cost of the clutch device. Of course, when the clutch gear 20 and the clutch plate 30 are manufactured in a larger size, a higher clutch force can be obtained, but in this case, the problem of increased overall size of the clutch device will occur. Summary of the invention

[0011] Technical issues

[0012] The present disclosure is proposed to solve the above-mentioned problems, and aims to propose a composite clutch device in which clutch force is generated in multiple parts so that a high clutch force can be obtained even if the product is miniaturized, and the components generating the clutch force can be made of various types of materials, thereby reducing manufacturing costs and improving design freedom.

[0013] Technical Solution

[0014] In order to achieve the above-mentioned purpose, the composite clutch device of the present invention includes: a rotating block, which is provided with a central axis extending upward and an upward inclined protrusion, wherein the upward inclined protrusion surrounds the lower part of the central axis and is separated from the central axis by a predetermined distance; a C-shaped leaf spring, which surrounds the outer peripheral surface of the upward inclined protrusion and elastically and tightly contacts the outer side surface of the upward inclined protrusion; a clutch gear, which is provided with a downward inclined protrusion, when the upward inclined protrusion is inserted into the lower side of the clutch gear, the downward inclined protrusion is pressed between the central axis and the upward inclined protrusion, and a retaining protrusion inserted between the longitudinal opposite ends of the C-shaped leaf spring; and an elastic body, which is fixedly coupled to the central axis and applies a downward elastic force to the upper surface of the clutch gear.

[0015] Each of the upwardly inclined protrusion and the downwardly inclined protrusion may be formed in a cylindrical shape.

[0016] The inner surface of the upwardly inclined protrusion may be formed to be inclined in a direction gradually decreasing along the inner diameter of the upwardly inclined protrusion toward the lower end of the upwardly inclined protrusion, and the outer surface of the downwardly inclined protrusion may be formed to be inclined to make surface contact with the inclined inner surface of the upwardly inclined protrusion.

[0017] The sidewall of the downwardly inclined protrusion may include a plurality of cutting slits formed thereon, wherein the cutting slits extend upward from a lower end of the downwardly inclined protrusion.

[0018] The plurality of cutting slits may be arranged in a circular shape around a central axis of the upwardly inclined protrusion and may be spaced apart from each other at the same interval.

[0019] Downward sloping protrusion

[0020] The rotating block may be provided with a mounting flange on which the C-shaped leaf spring is mounted.

[0021] The C-shaped leaf spring may be provided with a plurality of C-shaped leaf springs.

[0022] The elastic body may include an insertion hole formed at a central portion thereof, wherein the central shaft is inserted into the insertion hole, and the elastic body may be formed to have a disk shape whose height gradually decreases toward an outer end thereof.

[0023] The inner diameter side of the elastomer may be provided with a horizontally protruding engagement protrusion, the central shaft may include a large diameter portion having a cylindrical shape and a small diameter portion extending upward from the upper end of the large diameter portion and having an outer diameter smaller than that of the large diameter portion, and the composite clutch device may further include an engagement slit, the engagement slit including a vertical slit and a horizontal slit, the vertical slit being formed to a size allowing the engagement protrusion to be inserted therein and extending downward from the upper end of the large diameter portion, and the horizontal slit extending horizontally from the lower end of the vertical slit.

[0024] A holding claw protruding downward may be provided at an upper end of a portion of the horizontal slit connected to the vertical slit.

[0025] Beneficial Effects

[0026] According to the composite clutch device of the present disclosure, clutch force is generated at multiple locations, so a high clutch force can be obtained even if the product is miniaturized, and the components generating the clutch force can be manufactured using various types of materials, thereby reducing manufacturing costs and increasing design freedom. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an exploded perspective view of a conventional clutch device.

[0028] Figure 2 is a perspective view of a composite clutch device of the present disclosure.

[0029] Figure 3 is a cross-sectional perspective view of a composite clutch device of the present disclosure.

[0030] Figure 4 is an exploded perspective view of a composite clutch device of the present disclosure.

[0031] Figure 5 is an exploded perspective view of a clutch gear and a C-shaped leaf spring included in the composite clutch device of the present disclosure.

[0032] Figure 6 is a horizontal cross-sectional view of a composite clutch device of the present disclosure.

[0033] Figure 7 is an exploded perspective view showing a coupling structure of an elastic body and a rotating block.

[0034] Figure 8 1 is a bottom exploded perspective view of a second embodiment of a composite clutch device of the present disclosure.

[0035] Fig. 9 1 is a horizontal cross-sectional view of a clutch gear included in a second embodiment of a composite clutch device of the present disclosure. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the composite clutch device disclosed herein will be described in detail with reference to the accompanying drawings.

[0037] Figure 2 is a three-dimensional diagram of a composite clutch device disclosed herein, Figure 3 is a cross-sectional perspective view of a composite clutch device of the present disclosure, Figure 4 is an exploded perspective view of a composite clutch device disclosed herein, Figure 5 is an exploded perspective view of a clutch gear and a C-shaped leaf spring included in the composite clutch device of the present disclosure, and Figure 6 is a horizontal cross-sectional view of a composite clutch device of the present disclosure.

[0038] The composite clutch device disclosed in the present invention is a power transmission device for blocking power transmission and unblocking power transmission of a cover plate applied to a fuel inlet or a charging port of a vehicle. The power transmission device includes: a rotating block 100, which is provided with an upwardly extending central axis 110 and an upwardly inclined protrusion 120 surrounding the lower part of the central axis 110 and separated from the central axis 110 by a predetermined distance; a clutch gear 300, which is provided with a downwardly inclined protrusion 310, when the upwardly inclined protrusion 120 is inserted into the lower side of the clutch gear, the downwardly inclined protrusion 310 is press-fitted between the central axis 110 and the upwardly inclined protrusion 120; an elastic body 400, which is fixedly coupled to the central axis 110 and applies a downward elastic force to the upper surface of the clutch gear 300.

[0039] Since the downwardly inclined protrusion 310 is pressed downward by the elastic body 400 and is in close contact with the upwardly inclined protrusion 120, a large friction force is generated between the downwardly inclined protrusion 310 and the upwardly inclined protrusion 120. Therefore, when a rotational force is applied to the clutch gear 300 from the outside, the rotating block 100 rotates together with the clutch gear 300 due to the friction force between the downwardly inclined protrusion 310 and the upwardly inclined protrusion 120.

[0040] In this case, the composite clutch device of the present disclosure is further provided with a C-shaped leaf spring 200, which surrounds the outer peripheral surface of the upwardly inclined protrusion 120 and is in elastic and close contact with the outer side surface of the upwardly inclined protrusion 120, so that even if the friction between the downwardly inclined protrusion 310 and the upwardly inclined protrusion 120 is reduced, the rotating block 100 still rotates together with the clutch gear 300, and its structural feature is that a retaining protrusion 320 inserted between the longitudinal opposite ends of the C-shaped leaf spring 200 is provided on the inner side surface of the clutch gear 300.

[0041] Since the retaining protrusion 320 of the clutch gear 300 is inserted between the longitudinally opposite ends of the C-shaped leaf spring 200, the C-shaped leaf spring 200 always rotates integrally with the clutch gear 300, and since the C-shaped leaf spring 200 is in close contact with the outer side surface of the upwardly inclined protrusion 120 by its elastic force, a large friction force is generated between the C-shaped leaf spring 200 and the upwardly inclined protrusion 120. Therefore, when the C-shaped leaf spring 200 rotates with the clutch gear 300, the upwardly inclined protrusion 120 and the rotating block 100 provided with the upwardly inclined protrusion 120 also rotate together with the clutch gear 300.

[0042] Of course, when the force that stops the rotating block 100 from rotating is greater than the friction between the C-shaped leaf spring 200 and the upward inclined protrusion 120, when the clutch gear 300 rotates, sliding will occur between the C-shaped leaf spring 200 and the upward inclined protrusion 120, so that the rotating block 100 will not rotate with the clutch gear 300.

[0043] Therefore, in the composite clutch device of the present disclosure, the rotational force of the clutch gear 300 is transmitted to the rotating block 100 not only through the friction force between the upward inclined protrusion 120 and the downward inclined protrusion 310, but also through the friction force between the C-shaped leaf spring 200 and the upward inclined protrusion 120. Therefore, even if the clutch gear 300 and the rotating block 100 are made of a material with relatively small friction (such as synthetic resin), there is an advantage that a sufficiently high clutch force can be obtained, that is, the degree of freedom of the material of each component is increased.

[0044] In addition, as described above, when the clutch force occurs in multiple parts, even if the clutch gear 300 and the rotating block 100 are made small, a sufficiently high clutch force can be obtained, thus also having the advantage of miniaturizing the composite clutch device of the present disclosure.

[0045] At the same time, the upwardly inclined protrusion 120 and the downwardly inclined protrusion 310, which are in close contact with each other through the elastic body 400, need to contact each other on the surface to increase the friction between them. When the contact surface between them is formed to be horizontal, there is a problem that the diameters of the rotating block 100 and the clutch gear 300 need to be greatly increased to increase the contact area.

[0046] To solve the above problems, the composite clutch device of the present disclosure has another structural feature, that is, the contact surface between the upward inclined protrusion 120 and the downward inclined protrusion 310 is formed to be obliquely inclined. For example, the upward inclined protrusion 120 may be formed in a cylindrical shape, but the inner side surface of the upward inclined protrusion 120 may be formed to be inclined in a direction in which the inner diameter of the upward inclined protrusion 120 gradually decreases toward the lower end of the upward inclined protrusion 120, and the outer side surface of the downward inclined protrusion 310 may be formed to be inclined to make surface contact with the inclined inner side surface of the upward inclined protrusion 120.

[0047] In this way, when the upwardly inclined protrusion 120 and the downwardly inclined protrusion 310 are each formed to have a wedge-shaped vertical cross section, the upwardly inclined protrusion 120 and the downwardly inclined protrusion 310 are in close contact with each other through the elastic body 400 to contact each other on the surface, and the contact area between them can be significantly increased within a limited space, thereby having the advantage of being able to obtain a high clutch force while miniaturizing the product. In this case, the angle of the contact surface between the upwardly inclined protrusion 120 and the downwardly inclined protrusion 310 can be changed in various ways according to various circumstances (such as the specifications and materials of each component).

[0048] In addition, if both the upwardly inclined protrusion 120 and the downwardly inclined protrusion 310 are formed in a wedge shape, the upwardly inclined protrusion 120 may be deformed to open outward when the clutch gear 300 rotates and the downwardly inclined protrusion 310 is pressed downward. However, in the composite clutch device of the present disclosure, the C-shaped leaf spring 200 is pressed against the outer side surface of the upwardly inclined protrusion 120, so there is also an advantage of preventing the upwardly inclined protrusion 120 from being deformed.

[0049] Meanwhile, in order to prevent the C-shaped leaf spring 200 from being disengaged from the clutch gear 300 when the rotating block 100 and the clutch gear 300 rotate, the rotating block 100 may be provided with a mounting flange 140 on which the C-shaped leaf spring 200 is mounted. In this case, preferably, the mounting flange 140 is formed in a ring shape, surrounding the entire outer peripheral surface of the rotating block 100, so that the entire lower end of the C-shaped leaf spring 200 can be located thereon.

[0050] In addition, the contact force between the upwardly inclined protrusion 120 and the C-shaped leaf spring 200 is determined by the elastic force of the C-shaped leaf spring 200. When the C-shaped leaf spring 200 is manufactured as one body, there is a problem that the contact force between the upwardly inclined protrusion 120 and the C-shaped leaf spring 200 is not adjustable. In the composite clutch device of the present disclosure, the C-shaped leaf spring 200 may include a plurality of C-shaped leaf springs so that the contact force between the upwardly inclined protrusion 120 and the C-shaped leaf spring 200 is adjustable.

[0051] Therefore, when a plurality of C-shaped leaf springs 200 are provided, the advantage is that the manufacturer can achieve the strength of the clutch force desired by the user by appropriately increasing or decreasing the number of C-shaped leaf springs 200. In the present embodiment, only two C-shaped leaf springs 200 are provided, but the number of C-shaped leaf springs 200 may be three or more.

[0052] In addition, the elastic body 400 pressing the clutch gear 300 downward is preferably formed to uniformly press the entire upper surface of the clutch gear 300. That is, the elastic body 400 may include an insertion hole 410 formed in a central portion thereof, into which the central shaft 110 is inserted, and the elastic body 400 may be formed to have a disc shape whose height gradually decreases toward its outer end. In this case, the clutch gear 300 may form a mounting groove 330 on its upper surface to fit to the outer end of the elastic body 400, so that the outer end of the elastic body 400 can be stably mounted.

[0053] Thus, when the elastic body 400 is formed into a disc shape, the outer end of the elastic body 400 uniformly presses down the entire upper surface of the clutch gear 300. Therefore, all parts of the upwardly inclined protrusion 120 and the downwardly inclined protrusion 310 in all directions uniformly contact each other closely, thereby maximizing the clutch force.

[0054] Figure 7 is an exploded perspective view showing a coupling structure of the elastic body 400 and the rotating block 100 .

[0055] The composite clutch device of the present disclosure can be configured so that power transmission between the clutch gear 300 and the rotating block 100 is achieved not only by the friction force between the downwardly inclined protrusion 310 and the upwardly inclined protrusion 120, and the friction force between the C-shaped leaf spring 200 and the upwardly inclined protrusion 120, but also by the friction force between the elastic body 400 and the clutch gear 300.

[0056] That is, the elastic body 400 pressing the clutch gear 300 downward is fixedly coupled to the central shaft 110 of the rotating block 100, and can be installed to be in close contact only with the clutch gear 300. In this way, when the outer end of the elastic body 400 is configured to be in close contact with the upper surface of the clutch gear 300, the rotational force of the clutch gear 300 can be transmitted to the central shaft 110 through the elastic body 400, thereby further improving the clutch force of the composite clutch device of the present disclosure.

[0057] In addition, when the elastic force of the elastic body 400 changes, the friction between the elastic body 400 and the clutch gear 300 also changes, thereby increasing or decreasing the clutch force. Therefore, the user can easily control the clutch force of the composite clutch device of the present disclosure by replacing the elastic body 400 with a product having a different elastic force.

[0058] Therefore, in the composite clutch device of the present disclosure, it is preferred that the elastic body 400 is detachably coupled to the central shaft 110 , and the elastic body 400 coupled to the central shaft 110 is configured to always rotate integrally with the central shaft 110 .

[0059] For example, the inner diameter side of the elastic body 400 may be provided with a horizontally protruding engagement protrusion 420, and the central shaft 110 may be divided into a large diameter portion 110a and a small diameter portion 110b extending upward from the upper end of the large diameter portion 110a, wherein the large diameter portion 110a may be formed with an engagement slit 130, and the engagement protrusion 420 may be inserted into the engagement slit 130. In this case, the engagement slit 130 may be composed of a vertical slit 132 extending downward from the upper end of the large diameter portion 110a and a horizontal slit 134 extending horizontally from the lower end of the vertical slit 132.

[0060] In this way, when the engagement slit 130 is formed in the large diameter portion 110a of the center shaft 110, the user can fixedly couple the elastic body 400 to the center shaft 110 by inserting the engagement protrusion 420 of the elastic body 400 into the engagement slit 130. At the same time, in order to prevent the elastic body 400 from sliding with the center shaft 110 when the elastic body 400 rotates with the clutch gear 300, a downwardly protruding retaining claw 136 is formed at the upper end of a portion of the horizontal slit 134 connected to the vertical slit 132. When the retaining claw 136 is formed in this way, when the elastic body 400 rotates, the engagement protrusion 420 interferes with the retaining claw 136, so that the elastic body 400 and the center shaft 110 always rotate integrally.

[0061] Figure 8 is a bottom exploded perspective view of a second embodiment of a composite clutch device of the present disclosure, Fig. 9 1 is a horizontal cross-sectional view of a clutch gear included in a second embodiment of a composite clutch device of the present disclosure.

[0062] It is preferred that the upwardly inclined protrusion 120 and the downwardly inclined protrusion 310 included in the composite clutch device of the present disclosure are both formed in a cylindrical shape to maximize the contact area therebetween. In this case, when the downwardly inclined protrusion 310 is formed in a cylindrical shape, there is no elasticity in the radial direction thereof. Therefore, when the outer side surface of the central shaft 110 and the inner side surface of the upwardly inclined protrusion 120 do not form a perfect circle, the outer side surface of the downwardly inclined protrusion 310 and the inner side surface of the upwardly inclined protrusion 120 may not be in complete close contact with each other.

[0063] In the composite clutch device of the present disclosure, in order to solve this problem, that is, in order to enable the downward inclined protrusion 310 to have elasticity in the diameter direction (horizontal direction in this embodiment), the side wall of the downward inclined protrusion 310 may include a plurality of cutting slits 312 formed thereon, wherein the cutting slits 312 extend upward from the lower end of the downward inclined protrusion 310.

[0064] Therefore, when a plurality of cutting slits 312 are formed in the downwardly inclined protruding portion 310, a portion between two adjacent cutting slits 312 of the downwardly inclined protruding portion 310 is slitted in the diameter direction of the downwardly inclined protruding portion 310 (see Fig. 9 , and the outer surface of the downwardly inclined protrusion 310 and the inner surface of the upwardly inclined protrusion 120 are in perfect close contact with each other, thereby obtaining the effect of improving the clutch force.

[0065] In this case, in order to uniformly form elasticity on all parts of the downwardly inclined protrusion 310, it is preferred that the cutting slits 312 are arranged in a circle around the central axis of the upwardly inclined protrusion 120 and are equally spaced from each other. Meanwhile, in this embodiment, only the case where eight cutting slits 312 are formed in the downwardly inclined protrusion 310 is shown, but the number and specifications of the cutting slits 312 can be variously changed according to various conditions.

[0066] Although the present disclosure has been described in detail using preferred embodiments, the scope of the present disclosure is not limited to specific embodiments, but should be understood according to the scope of the appended claims. In addition, those skilled in the art will appreciate that many modifications and variations can be made without departing from the scope of the present disclosure.

Claims

1. A composite clutch device, comprising: a rotating block, the rotating block being provided with a central axis extending upward and an upwardly inclined protrusion, the upwardly inclined protrusion surrounding a lower portion of the central axis and being spaced apart from the central axis by a predetermined distance; a C-shaped leaf spring surrounding an outer peripheral surface of the upwardly inclined protrusion and in elastic close contact with the outer peripheral surface of the upwardly inclined protrusion; a clutch gear provided with a downwardly inclined protrusion which is press-fitted between the center shaft and the upwardly inclined protrusion when the upwardly inclined protrusion is inserted into a lower side of the clutch gear, and a retaining protrusion which is inserted between longitudinally opposite ends of the C-shaped leaf spring; and An elastic body is fixedly coupled to the central shaft and applies a downward elastic force to an upper surface of the clutch gear.

2. The composite clutch device according to claim 1, wherein: The upwardly inclined protrusion and the downwardly inclined protrusion are each formed in a cylindrical shape.

3. The composite clutch device according to claim 2, wherein: The inner side surface of the upwardly inclined protrusion is formed to be inclined in a direction gradually decreasing along the inner diameter of the upwardly inclined protrusion toward the lower end of the upwardly inclined protrusion, and the outer side surface of the downwardly inclined protrusion is formed to be inclined to make surface contact with the inclined inner side surface of the upwardly inclined protrusion.

4. The composite clutch device according to claim 2, wherein: The side wall of the downwardly inclined protrusion includes a plurality of cutting slits formed thereon, the cutting slits extending upward from a lower end of the downwardly inclined protrusion.

5. The composite clutch device according to claim 4, wherein: The plurality of cutting slits are arranged in a circle around a central axis of the upwardly inclined protrusion and are equally spaced apart from one another.

6. The composite clutch device according to claim 1, wherein: The rotating block is provided with a mounting flange, and the C-shaped leaf spring is mounted on the mounting flange.

7. The composite clutch device according to claim 1, wherein: The C-shaped leaf spring is provided with a plurality of C-shaped leaf springs.

8. The composite clutch device according to claim 1, wherein: The elastic body includes an insertion hole formed at a central portion thereof, the central shaft is inserted into the insertion hole, and the elastic body is formed in a disk shape whose height gradually decreases toward an outer end thereof.

9. The composite clutch device according to claim 8, wherein: The inner diameter side of the elastic body is provided with a horizontally protruding engagement protrusion, The central shaft includes a large diameter portion having a cylindrical shape, and a small diameter portion extending upward from an upper end of the large diameter portion and having an outer diameter smaller than that of the large diameter portion, and The composite clutch device further includes an engagement slit including a vertical slit formed in a size to allow the engagement protrusion to be inserted therein and extending downward from an upper end of the large diameter portion and a horizontal slit extending horizontally from a lower end of the vertical slit.

10. The composite clutch device according to claim 9, wherein: The upper end of the portion of the horizontal slit connected to the vertical slit is formed with a holding claw protruding downward.

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