Wrist sports equipment capable of finely adjusting sports intensity

Abstract

The utility model discloses wrist sports equipment capable of finely adjusting sports intensity, and particularly, the wrist sports equipment is provided with a holding part which is elastically supported in a manner of rotating in only one direction relative to a fixed body, a plurality of blocking parts formed in the circumferential direction of the fixed body and the strength adjusting cover are formed in a mutually engaged manner, and the plurality of blocking parts are configured as ratchet wheels, so that the exercise strength can be finely adjusted by changing the angle of the strength adjusting cover.

Description

Technical Field

[0001] The utility model relates to a wrist exercise equipment capable of fine-tuning exercise intensity. Specifically, the wrist exercise equipment comprises a gripping portion which is elastically supported in a manner of rotating in only one direction relative to a fixed body, a plurality of obstructed portions formed in the peripheral direction of the fixed body and an intensity adjustment cover are formed in a manner of meshing with each other and the plurality of obstructed portions are configured as ratchets so that the exercise intensity can be fine-tuned by changing the angle of the intensity adjustment cover. Background Art

[0002] Recently, the number of people doing fitness exercises has increased due to reasons such as health, body balance and weight loss.

[0003] Fitness exercises are mainly divided into endurance exercises and muscle exercises. Nowadays, there are many sports equipment for various parts of the body, including fixed sports equipment installed in fitness clubs and the like and portable sports equipment.

[0004] On the other hand, people who work in professions that require continuous and repeated use of their hands or arms, for example, professionals in computer word processing, electronic equipment, computer graphics, drawing, athletes, drivers, etc., need to use their hands and arms repeatedly within a certain range during their entire working hours, which accumulates fatigue in these areas.

[0005] In particular, occupational groups that use their wrists extensively may suffer from diseases such as wrist joint syndrome due to accumulated wrist fatigue.

[0006] Therefore, it is very important to prevent wrist-related diseases through wrist strengthening exercises. General wrist strengthening equipment has little effect on wrist training because it cannot properly exercise the wrist. Exercises that use barbells and other objects to repeatedly bend and stretch the wrists are not portable because the barbells are difficult to store and carry, and are therefore restricted in terms of exercise time and location.

[0007] As a wrist exercise device that solves this problem, Korean registered patent No. 10-1068853 can be cited.

[0008] The Korean registered patent No. 10-1068853 sandwiches springs inside the handles on both sides and uses the elastic force of the springs to allow the grip of the handles to rotate bidirectionally to perform wrist-enhancing exercises using only wrist strength. The intensity of the exercise can be adjusted by changing the elastic force of the springs.

[0009] Furthermore, in order to change the elastic force of the spring, a strength adjustment portion having a wrench groove is placed inside the lower spring clamp of the handle so that the strength adjustment portion can be rotated to change the angle using a wrench, thereby adjusting the elastic force of the spring, that is, the degree of torsion, but it is necessary to carry a wrench together to adjust the exercise intensity.

[0010] Moreover, when changing the angle of the strength adjustment part, the strength adjustment part needs to be put back to its original position after being rotated while being pressed strongly with a wrench, making it inconvenient to use. It is difficult for women, the elderly and the weak to use the strength adjustment part.

[0011] As another wrist exercise equipment, Korean registered patent No. 10-0996742 can be cited. Korean registered patent No. 10-0996742 has a rotating ring that can rotate together with the handle. After pressing the handle, the rotating ring rotates and the shaft is tightened or loosened by the fixing bolt, thereby changing the compression degree of the spring to change the exercise intensity.

[0012] The advantage of the Korean registered patent No. 10-0996742 is that no additional tools are required to change the exercise intensity, but if the handle is pressed during wrist movement, the exercise intensity may be changed unexpectedly, and the rotation angle of the rotating ring is limited to 6 levels and the exercise intensity cannot be fine-tuned. In addition, its internal structure is complicated, which increases the production unit price and reduces production efficiency. Utility Model Content

[0013] The utility model aims to solve the above-mentioned problems. The purpose of the utility model is to provide a wrist exercise equipment, which can adjust the elastic force of the internal elastic body by simply rotating the angle adjustment cover, and can easily adjust the exercise intensity according to the user's own situation, including general men, women and the elderly and the weak.

[0014] In order to achieve the above object, the wrist exercise equipment according to the utility model comprises:

[0015] The fixed body has a first set of hanging parts protruding inwards;

[0016] A handle having a gripping portion with one end connected to the other end of the fixed body and rotatable relative to the fixed body;

[0017] A fixed cover is coupled to the other end of the grip portion, and the second hanging portion protrudes inward; and,

[0018] The elastic body has two ends fixed to the first hanging part and the second hanging part respectively to exert elastic force in one direction of the peripheral direction;

[0019] A plurality of first obstruction parts and a plurality of second obstruction parts corresponding to and meshing with each other are formed in the peripheral direction of the fixed body inside the fixed body and at one end of the handle, and one of the first obstruction parts or the second obstruction parts is constituted by a first ratchet protrusion.

[0020] Furthermore, in the wrist exercise equipment according to the utility model, the handle also includes a strength adjustment cover, one end of the strength adjustment cover provided with the multiple second obstruction parts is inserted into the interior of the fixed body and the other end is inserted into the outside of the gripping part, so that it can rotate together with the gripping part in one direction and can rotate independently of the gripping part in another direction.

[0021] Moreover, in the wrist exercise equipment according to the present invention, the elastic body is composed of a tension spring, and the strength adjustment cover is combined in a manner that it can reciprocate in the length direction relative to the fixed body.

[0022] At the same time, in the wrist exercise equipment according to the utility model, the strength adjustment cover is provided with a first guide groove and a second guide groove separated from each other in the upper and lower directions on the inner circumference, including a first stopper protruding from the first guide groove and a second stopper protruding from the second guide groove; the holding part includes a first blocked protrusion and a second blocked protrusion, and the first blocked protrusion and the second blocked protrusion protrude from the outer circumference at the heights corresponding to the first guide groove and the second guide groove, respectively, and are respectively blocked by the first stopper and the second stopper to limit the bidirectional rotation angle of the holding part.

[0023] The wrist exercise equipment according to the utility model has the following advantages and beneficial effects:

[0024] Wrist strengthening exercises can be easily performed by rotating the grip part. The elastic force of the internal elastic body can be changed simply by rotating the intensity adjustment cover, so that ordinary men, women and the elderly and the weak can easily adjust the exercise intensity. The exercise intensity can also be fine-tuned to allow exercise to be performed according to the user's condition, thereby improving convenience.

[0025] In addition to the grip portion for wrist exercise, an intensity adjustment cover for adjusting the intensity of exercise is also provided, thereby distinguishing between wrist enhancement exercise and exercise intensity adjustment and being able to use them as needed.

[0026] A tension spring constituting the elastic body is combined with a handle that can reciprocate in the length direction relative to the fixed body, so that the strength adjustment cover can be easily fixed after the angle is changed.

[0027] The fixing cover covered with the elastic body can be fixed after being rotated relative to the gripping part, so the basic intensity of the wrist enhancement exercise itself can be set to different intensities for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the wrist exercise equipment according to the present invention.

[0029] Figure 2 yes Figure 1 Exploded three-dimensional diagram of the main parts.

[0030] Figure 3 yes Figure 1 AA section view.

[0031] Figure 4 yes Figure 1 BB cross-sectional view.

[0032] Figure 5 yes Figure 4 CC cross-sectional view.

[0033] Figure 6 yes Figure 4 DD cross-sectional view.

[0034] Description of Reference Numerals

[0035] 1: Handle assembly 2: Gear head

[0036] 10: Fixed body 11: First hanging part 12: First obstructed part

[0037] 13: First insertion hole 14: First restraining member 15: Reference line

[0038] 20: Strength adjustment cover 21: Second obstruction portion 22: Baffle portion

[0039] 23: First guide groove 24: Second guide groove 25: Constraint groove

[0040] 26: Second insertion hole 27: Second restraining member 28: Threshold portion

[0041] 30: gripping portion 31: serrated portion 32: first obstructing protrusion

[0042] 33: second blocking protrusion 34: third blocking portion 35: restraining groove

[0043] 36: The third insertion hole

[0044] 40: fixed cover 41: second set of hanging parts 42: fourth obstruction part

[0045] 43: Insertion groove 44: Third restraining member

[0046] 50: tension spring 51: first set of hanging ends 52: second set of hanging ends DETAILED DESCRIPTION

[0047] The utility model can be modified in various ways and can have various forms. This specification will describe the embodiments in detail. However, the utility model cannot be limited to the disclosed embodiments. It should be understood that all replacements, deformations and modifications within the technical and spiritual scope of the utility model are included.

[0048] The same symbols in the drawings, especially the symbols with the same tens digit and units digit, or the same tens digit, units digit and English letters, represent components with the same or similar functions. Unless otherwise specified, the components represented by each symbol are parts that comply with the standard.

[0049] Moreover, the size or thickness of the elements in each figure is exaggeratedly enlarged (or thickened) or reduced (or thinned) or simplified for reasons such as ease of understanding, and this shall not be used to limit the scope of protection of the present utility model.

[0050] The terms used in this application are only used to illustrate specific embodiments and shall not be used to limit the present invention. Unless it can be clearly distinguished in the context of the sentence, the singular expression also includes the plural case.

[0051] The terms "including" or "having" in this application only specify the existence of features, numbers, steps, actions, elements, parts or their combinations recorded in the specification, and shall not be regarded as excluding the possibility of the existence or addition of one or more other features, numbers, steps, actions, elements, parts or their combinations in advance.

[0052] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meanings as those generally understood by people with general knowledge in the technical field to which the present invention belongs. The meanings of terms defined in general dictionaries should be interpreted as consistent with the meanings they have according to the context of the relevant technology, and shall not be interpreted abnormally or excessively unless clearly defined in this application.

[0053] The terms “first”, “second”, etc. described in this specification are only used to distinguish different elements and are not limited to the manufacturing order. The names may be inconsistent in the detailed description of the utility model and the claims.

[0054] For the sake of convenience, the following Figure 1 The description is based on an imprecise and approximate direction reference of the wrist exercise equipment of the present invention, in which the direction of gravity is taken as the lower side and up, down, left and right are directly defined in the direction seen. Unless otherwise specified, other detailed descriptions of other drawings and the claims are also described after defining the directions according to this reference.

[0055] The wrist exercise equipment according to the present utility model is described in detail below with reference to the accompanying drawings.

[0056] like Figure 1 to Figure 2 As shown, the wrist exercise equipment of the present invention comprises a handle assembly 1, which mainly comprises a fixing body 10, a strength adjustment cover 20, a gripping portion 30, a fixing cover 40 and an elastic body.

[0057] The figure representatively shows the following form, that is, a pair of handle assemblies 1 are connected to each other by means of a gear head 2 so that the handle assemblies 1 can be used at multiple angles, but the present invention is not limited to this.

[0058] For example, not only can a pair of handle assemblies 1 be simply connected in a straight bar shape, but a single-item wrist exercise equipment can also be realized with only one handle assembly 1.

[0059] Therefore, this specification only describes the main elements of the handle assembly 1 for easy understanding.

[0060] Next, the fixed body 10 has a tubular shape with one upper end (upper surface) closed and the other lower end (lower surface) open. On the inner side of the upper surface of the fixed body 10, the first hanging part 11 protrudes toward the inside (lower part).

[0061] The first hanging portion 11 is in the shape of a column or a tube with a first hanging hole 111 passing through it laterally.

[0062] At the same time, the fixing body 10 has a plurality of first obstruction portions 12 protruding along the inner side surface of the side wall portion at a certain interval in the peripheral direction of the first hanging portion 11 .

[0063] The strength adjustment cover 20 has a drum shape with one end on the upper side and the other end on the lower side forming an opening. At one end, a plurality of second obstruction parts 21 correspondingly engaged with the plurality of first obstruction parts 12 protrude and are arranged in a circumferential direction, and the lower part is connected to a baffle part 22 with an expanded diameter.

[0064] Furthermore, one side surface of the first obstructed portion 12 (the surface on the rotation direction side of the strength adjustment cover 20) is Figure 3 The left side surface of the second obstructed portion 21 (the side opposite to the rotation direction of the strength adjustment cover 20) is formed by Figure 3 The right side surface (based on the right side) is constructed in the form of having corresponding inclined surfaces (hypotenuses), thereby forming a first ratchet that restricts the strength adjustment cover 20 from rotating in only one direction relative to the fixed body 10.

[0065] At the same time, the strength adjustment cover 20 is provided with a first guide groove 23 and a second guide groove 24 separated from each other in upper and lower directions on its inner circumference, including a first stopper 231 protruding from the first guide groove 23 and a second stopper 241 protruding from the second guide groove 24 .

[0066] The first guide groove 23 and the second guide groove 24 are formed in a manner of being separated from each other up and down and having different diameters on the inner side surface of the baffle portion 22, and the first obstructed protrusion 32 and the second obstructed protrusion 33 of the holding portion 30 are inserted into the guide grooves 23, 24 to guide the rotational movement of the obstructed protrusions 32, 33.

[0067] At this time, the first obstructed protrusion 32 and the second obstructed protrusion 33 are respectively blocked by the first stopper 231 and the second stopper 241 to limit the bidirectional rotation angle of the gripping portion 30 .

[0068] Specifically, the first stopper 231 and the second stopper 241 protrude at different positions, more preferably, at positions opposite to each other, so that when the holding portion 30 rotates bidirectionally, the first blocked protrusion 32 and the second blocked protrusion 33 rotate and move along the guide grooves 22, 23 and contact one side or the other side of the first stopper 231 and the second stopper 241 respectively and are blocked, thereby limiting the maximum rotation angle of the holding portion 30.

[0069] At the same time, the strength adjustment cover 20 is formed with a third guide groove 25 on the outer peripheral surface, and the fixed body 10 includes a first insertion hole 13 formed on both sides of the side wall portion at a height corresponding to the third guide groove 25, and a first restraint member 14 clamped into the first insertion hole 13 and inserted into the third guide groove 25.

[0070] The first restraining member 14 is inserted into the third guide groove 25 and blocked at the top and bottom, thereby preventing the strength adjustment cover 20 from being separated and guiding the rotation when the strength adjustment cover 20 rotates.

[0071] In the drawing, the first restraining member 14 in the shape of an arrow pointing in the rotation direction of the strength adjustment cover 20 can be confirmed.

[0072] Next, one end of the grip portion 30 is coupled to the other end of the strength-adjusting cover 20 in a manner of being bidirectionally rotatable relative to the strength-adjusting cover 20 .

[0073] The gripping portion 30 has a long tube shape with openings formed at the upper and lower parts, a serration portion 31 protruding from one end and arranged in the peripheral direction, and a plurality of third obstruction portions 34 protruding from the other end and arranged in the peripheral direction.

[0074] The sawtooth portion 31 has a shape in which isosceles triangle-shaped sawtooth is continuously arranged, and the sawtooth portion 31 is blocked and supported by a protruding threshold portion 28 formed on the inner peripheral surface of the strength adjustment cover 20 .

[0075] The serrations 31 can not only prevent the gripping portion 30 from being excessively inserted into the strength adjustment cover 20 , but also reduce friction when the gripping portion 30 rotates relative to the strength adjustment cover 20 .

[0076] The outer peripheral surface of the grip portion 30 may be covered with a soft cover such as sponge or rubber to enhance the gripping feeling.

[0077] At the same time, the first blocking protrusion 32 and the second blocking protrusion 33 are protruded from the outer circumferential surface of the upper end of the holding portion 30 at heights corresponding to the first guiding groove 23 and the second guiding groove 24 respectively, and are inserted into the first guiding groove 23 and the second guiding groove 24 .

[0078] Moreover, in order to achieve the combination between the strength adjustment cover 20 and the holding part 30, the holding part 30 is formed with a constraint groove 35 along the outer peripheral surface of the upper end portion, and the strength adjustment cover 20 also includes a second insertion hole 26 formed on both sides of the side wall part, and a second constraint member 27 clamped into the second insertion hole 26 and inserted into the constraint groove 35.

[0079] The second restraining member 27 is blocked by the restraining groove 35 like the first restraining member 14 to prevent the gripping portion 30 from being separated from the strength adjustment cover 20 and guide the gripping portion 30 to rotate independently.

[0080] Below the reference line 15 of the strength adjustment cover 20 in the drawing, a second restraining member 27 in the shape of an inverted triangle for indicating the scale 221 formed on the outer peripheral surface of the baffle portion 22 can be confirmed.

[0081] Next, the fixing cover 40 is coupled to the other end of the grip portion 30 , and the second hook portion 41 protrudes toward the inside (upper portion).

[0082] The fixed cover 40 has an opening on the upper surface and a locked lower surface. The second hanging portion 41 protrudes in the shape of a column or a tube in the center of the bottom surface. The second hanging portion 41 is formed with a second hanging hole that penetrates laterally perpendicular to the first hanging hole 111. The two side ends of the elastomer are respectively clamped in the first hanging hole 111 and the second hanging hole to provide an elastic force to drive the holding portion 30 to return to its original position when it rotates relative to the strength adjustment cover 20.

[0083] At the same time, the fixing cover 40 has a plurality of fourth obstruction portions 42 protruding at a certain interval along the periphery of the second hanging portion 41 , which correspond to the plurality of third obstruction portions 34 and mesh with each other.

[0084] Like the first obstruction portion 12 and the second obstruction portion 21, the third obstruction portion 34 and the fourth obstruction portion 42 have mutually corresponding inclined surfaces (bevels) on the side surfaces in opposite directions, forming a second ratchet that restricts the fixed cover 40 from rotating in only one direction relative to the grip portion 30.

[0085] At this time, in order to increase the rotational movement distance of the fixed cover 40 , it is more preferred that the fourth obstruction parts 42 are formed in a ladder shape with an oblique side on only one side while increasing the interval between the fourth obstruction parts 42 so that the third obstruction part 34 can be inserted between the fourth obstruction parts 42 .

[0086] When assembling, the fixed cover 40 is inserted to the outside of the other end of the gripping part 30 in a state where the elastic body is hung so that the third obstruction part 34 and the fourth obstruction part 42 are meshed with each other. In this state, if the fixed cover 40 is rotated in one direction by a certain angle, the elastic body formed by the tension spring 50 is twisted in the torsional direction so that the elastic force is increased and the basic exercise intensity is set in the zero point state of the intensity adjustment cover 20.

[0087] At the same time, in order to combine with the holding part 30 after the fixed cover 40 is rotated, the holding part 30 is formed with a plurality of third insertion holes 36 in the peripheral direction, and the fixed cover 40 includes an insertion groove 43 having a shape corresponding to the third insertion hole 36, and a third restraint member 44 that is clamped into the insertion groove 43 and inserted into one of the plurality of third insertion holes 36.

[0088] As can be seen from the drawings, a total of four third insertion holes 36 are formed at an angle of 90 degrees in the grip portion 30 , and a third restraining member 44 is formed in the same appearance as a portion of the upper end of the fixing cover 40 .

[0089] Thus, after the fixing cover 40 is rotated by a preset angle with a portion of the third restraining member 44 clamped in the insertion groove 43 , the third restraining member 44 is pressed to be inserted into the third insertion hole 36 , thereby completing the combination of the grip 30 and the fixing cover 40 .

[0090] At this time, although not shown in the drawings, if a pulling tool such as a ring is added to the third restraint 44, the user can pull out the third restraint 44 in the initial assembly state at the time of shipment, rotate the fixed cover 40 at will, and reassemble it to change the basic exercise intensity according to the user's situation.

[0091] Next, the two ends of the elastic body are respectively fixed to the first hanging portion 11 and the second hanging portion 41 to exert elastic force in one direction of the peripheral direction.

[0092] The elastic body is composed of a tension spring 50 including the following elements: the tension spring 50 includes a torsion portion 51, a first hanging end 52 connected to one side of the torsion portion 51 and clamped into the first insertion hole 13, and a second hanging end 53 connected to the other side of the torsion portion 51 and clamped into the second insertion hole 26.

[0093] When the tension spring 50 expands in the tension direction, it exerts elastic force in the compression direction. Furthermore, the torsion portion 51 is twisted in one peripheral direction by the external force to accumulate elastic force, and then is released in the other peripheral direction by the restoring force when the external force is released.

[0094] When the wrist exercise device is used to rotate the grip portion 30 bidirectionally by using the wrist force after the grip portion 30 is gripped, the tension spring 50 exerts elastic force and restoring force every time the wrist rotates, thereby performing wrist muscle strengthening exercises.

[0095] Moreover, when the strength adjustment cover 20 is used to rotate the gripping portion 30 and the fixed cover 40 in one direction, the second hanging end 53 fixed to the fixed cover 40, which is different from the first hanging end 52 fixed to the fixed body 10, rotates together to twist the tension spring 50, thereby changing the exercise intensity.

[0096] At this time, the strength adjustment cover 20 is coupled to the fixed body 10 so as to be reciprocable in the longitudinal direction.

[0097] For this purpose, the vertical height of the third guide groove 25 is formed to be wider than the vertical thickness of the first restraining member 14 .

[0098] Therefore, when the intensity adjustment cover 20 is rotated in one direction so that the second obstruction portion 21 passes over the first obstruction portion 12, the grip portion 30 is led out and then introduced to change the exercise intensity.

[0099] When the strength adjustment cover 20 is returned to its original position after the exercise, if the strength adjustment cover 20 or the gripping portion 30 is held and force is applied in the length direction to remove the strength adjustment cover 20 from the fixing body 10, the plurality of second obstruction portions 21 are separated from the plurality of first obstruction portions 12.

[0100] In this state, if the strength adjustment cover 20 is rotated to the basic exercise strength position and then released, the elastic force of the tension spring 50 allows the strength adjustment cover 20 to be reintroduced into the fixed body 10 so that the multiple first obstruction parts 12 and the multiple second obstruction parts 21 are re-engaged and maintained in a combined state.

[0101] The utility model can be used to slightly change the intensity of exercise by using the intensity adjustment cover 20 without the need for additional tools. The basic intensity of exercise can be set by changing the fixed cover 40, so that customized exercise can be performed according to the user's physical condition, allowing men, women, old and young to easily perform wrist strengthening exercises.

[0102] At the same time, by using the basic elements constituting the appearance of the utility model as the restraints 14, 27, 44, the restraints between the fixed body 10, the strength adjustment cover 20, the gripping portion 30 and the fixed cover 40 and the rotation between the elements can be realized, so that the handle assembly 1 can be assembled more easily without using assembly parts such as bolts.

[0103] When describing the present invention in the foregoing text, the wrist exercise equipment was mainly described using the accompanying drawings, but technicians in the field to which the present invention belongs can make various deformations, modifications and substitutions to the present invention, and such deformations, modifications and substitutions should be interpreted as belonging to the scope of rights of the present invention.

Claims

1. A wrist exercise device capable of fine-tuning exercise intensity, characterized in that: include: The fixed body has a first set of hanging parts protruding inwards; A strength adjustment cover, one end of which is coupled to the other end of the fixed body; A gripping portion, one end of which is coupled to the other end of the strength adjustment cover and can be bidirectionally rotated relative to the strength adjustment cover; A fixed cover is coupled to the other end of the grip portion, and the second hanging portion protrudes inwardly; The elastic body has two ends fixed to the first hanging part and the second hanging part respectively to exert elastic force in one direction of the peripheral direction; On the fixed body and the strength adjustment cover, a plurality of first obstruction parts and a plurality of second obstruction parts corresponding to and engaging with each other are arranged in a peripheral direction. The first obstruction portion and the second obstruction portion constitute a first ratchet that allows the strength adjustment cover to rotate in only one direction relative to the fixed body.

2. The wrist exercise equipment capable of fine-tuning exercise intensity according to claim 1, characterized in that: The strength adjustment cover is provided with a first guide groove and a second guide groove separated from each other in an upper and lower direction on the inner circumferential surface, including a first stopper protruding from the first guide groove and a second stopper protruding from the second guide groove. The holding portion includes a first obstruction protrusion and a second obstruction protrusion, which protrude from the outer circumferential surface at heights corresponding to the first guide groove and the second guide groove, and are respectively blocked by the first stopper and the second stopper to limit the bidirectional rotation angle of the holding portion.

3. The wrist exercise equipment capable of fine-tuning exercise intensity according to claim 2, characterized in that: The elastic body is composed of a tension spring. The strength adjustment cover is coupled to the fixed body in a reciprocating manner in the longitudinal direction.

4. The wrist exercise equipment capable of fine-tuning exercise intensity according to any one of claims 1 to 3, characterized in that: At the other end of the gripping portion and inside the fixed cover, a plurality of third obstruction portions and a plurality of fourth obstruction portions corresponding to and meshing with each other are formed in the peripheral direction of the gripping portion, and the third obstruction portions and the fourth obstruction portions constitute a second ratchet that allows the fixed cover to rotate only in another direction relative to the gripping portion.

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