Holding handle assembly of fitness equipment, manufacturing method of holding handle assembly and holding rod of holding handle assembly

Abstract

The invention relates to a grip assembly of fitness equipment, a manufacturing method of the grip assembly and a grip rod of the grip assembly, the grip assembly comprises the grip rod and two counterweight seats, the grip rod is provided with a grip part and two connecting parts; the two connecting parts are flat geometric bodies and are respectively positioned at the two ends of the holding part; the connecting holes with the preset number are formed in the two connecting parts and penetrate through the two connecting parts; and the two counterweight seats are respectively arranged on the two connecting parts, each counterweight seat covers each connecting part, and the material of each counterweight seat penetrates into the connecting hole and is combined with the connecting hole.

Description

Technical Field

[0001] This invention relates to sports or fitness equipment, and in particular to grip components for fitness equipment, methods of manufacturing thereof, and grip bars of grip components. Background Technology

[0002] Dumbbells are a common type of exercise or fitness equipment, allowing users to perform fitness exercises without being limited by location or time. Traditional dumbbells come in a fixed weight, so if users want to use dumbbells of different weights, they need to buy several dumbbells of different weights, which is obviously not economical or suitable for collection.

[0003] To overcome the aforementioned shortcomings, the industry has developed adjustable dumbbells. These dumbbells are equipped with multiple weight blocks of different weights. By combining different weights or different numbers of weight blocks, the weight of the dumbbell can be adjusted, allowing users to adjust the weight of the dumbbell for their desired fitness activities. These dumbbells are also suitable for different fitness users, allowing each fitness enthusiast to adjust to a suitable weight.

[0004] The aforementioned adjustable weight dumbbells offer the convenience of adjustable weight, and one dumbbell can replace several traditional dumbbells, saving storage space.

[0005] The adjustable weight dumbbell has a handle at both ends, which can be selectively connected to or released one or more weights. For connecting the weights, each end of the handle is provided with a support member, and each support member provides several positions for inserting and releasing the weights.

[0006] Different manufacturers produce counterweight dumbbells with varying designs and combinations of grip and support structures. However, a common drawback of known counterweight dumbbells is that the grip and support structure are not easy to assemble, resulting in higher manufacturing costs and slower manufacturing speeds, which needs improvement. Summary of the Invention

[0007] One object of the present invention is to provide a grip assembly for fitness equipment, particularly a grip assembly for fitness equipment with adjustable weights, such as a grip assembly for dumbbells or barbells, which is easy to manufacture.

[0008] One object of the present invention is to provide a method for manufacturing a grip assembly for fitness equipment, particularly a method for manufacturing a grip assembly for a dumbbell or barbell with adjustable weights. The grip assembly has a grip bar and two weight seats respectively mounted at both ends of the grip bar. The grip bar and weight seats are easy to manufacture and assemble.

[0009] One object of the present invention is to provide a grip bar for a fitness equipment grip assembly that is easy to manufacture and suitable for injection molding of a plastic material onto the grip bar, so that the molded material can be easily bonded to the grip bar and the bond is stable.

[0010] The present invention provides a grip assembly for fitness equipment, comprising: a grip bar and two counterweight seats;

[0011] The grip has: a grip portion and two connecting portions; the grip portion is located in the center of the grip.

[0012] The two connecting parts are flat geometric shapes and are located at the two ends of the gripping part respectively; a predetermined number of connecting holes are provided on the two connecting parts and pass through the two connecting parts from front to back;

[0013] The two counterweight seats are respectively located at the two connecting parts, and each has a receiving space for the counterweight block to be placed in. Each counterweight seat covers the connecting part, and the material of the counterweight seat passes through the connecting hole and is connected to the connecting hole.

[0014] Due to the above structural features, the grip bar of the grip assembly is easy to manufacture, and the two counterweights and the two connecting parts have a solid connection.

[0015] Preferably, each of the connecting parts is provided with a plurality of fastening parts, such as fastening holes, which pass through the front and rear sides of the connecting part. These fastening parts are exposed in the connecting part, located in the receiving space, and are not covered by the counterweight seat, so as to allow the counterweight to be combined with the grip assembly.

[0016] Preferably, the grip includes two connecting portions, which are respectively connected between one end of the grip portion and one of the connecting portions. Each connecting portion has an inner end and an outer end. The inner end has a circular or elliptical outline, and the outer end is flat. The inner end of the connecting portion is connected to one end of the grip portion, and the outer end is connected to one end of the connecting portion.

[0017] Preferably, the outer contour of each of the connecting parts of the grip gradually changes from a circular or elliptical shape at its inner end to a flat shape at its outer end; one end of each of the two counterweights covers the two connecting parts.

[0018] Preferably, one end of each counterweight extends a lip towards the gripping portion of the handle, covering each connecting portion, which can increase the bonding strength between the two counterweights and the handle.

[0019] Preferably, each counterweight has a main body and an inner end plate and an outer end plate. The main body has an inner end and an outer end. The inner end plate and the outer end plate are respectively disposed at the inner end and the outer end of the main body. Each base covers each connecting part with the main body, and the material of the main body passes through the connecting hole.

[0020] Preferably, the main body of each counterweight seat has a plurality of spacers between the inner end plate and the outer end plate for inserting counterweight blocks.

[0021] Preferably, each of the counterweights has a plurality of ribs protruding from its main body, maintaining a distance between them, and the ribs create a plurality of spacers between the inner end plate and the outer end plate; each of the connecting parts has a plurality of fastening parts, and the fastening parts correspond to the spacers respectively.

[0022] Preferably, the main body has a front part and a rear part, which respectively abut the front and rear sides of each of the connecting parts; a plurality of through parts are inserted into the connecting holes and connect the front part and the rear part.

[0023] Preferably, each counterweight seat has a top edge with a wall thickness greater than that of the main body, and the front and rear edges of the top wall protrude from the front and rear sides of the main body; a plurality of support ribs connect the top wall to the front and rear sides of the main body.

[0024] The present invention provides a method for manufacturing a grip assembly for fitness equipment, comprising the following steps:

[0025] 1. Preparation of a grip: Take a metal tube and flatten both ends of the metal tube to form an un-hammered grip in the center of the grip, and flat connecting parts at both ends of the grip.

[0026] 2. Punch holes in the two connecting parts to give them through connecting holes;

[0027] 3. The handle is inserted into an injection mold, and a plastic counterweight is injected at each of the two connecting parts, so that the two counterweights cover the two connecting parts and cover the connecting holes of the two connecting parts, so that the material of the counterweights is combined with the connecting holes of the connecting parts.

[0028] Fourth, once the two counterweights are formed, the grip assembly of the fitness equipment is manufactured.

[0029] Thanks to the aforementioned structural features and manufacturing process, this grip assembly is easy to manufacture.

[0030] Preferably, in step two, a fastening part, such as a fastening hole, is provided for the two connecting parts; in step three, when the two counterweights are ejected, the two counterweights are made not to cover the fastening part.

[0031] The present invention provides a grip arm for a fitness equipment grip assembly, the grip arm having: a gripping part and two connecting parts;

[0032] The grip is located in the center of the handle and is in the shape of a cylindrical tube;

[0033] The two connecting parts are flat geometric shapes and are located at both ends of the gripping part; a predetermined number of connecting holes are provided on the two connecting parts and penetrate the front and rear sides of the two connecting parts; and

[0034] Two connecting portions are respectively connected between one end of the grip portion and one end of the connecting portion. Each connecting portion has an inner end and an outer end. The inner end has a circular or elliptical outline, and the outer end is flat. The inner end of the connecting portion is connected to one end of the grip portion, and the outer end is connected to one end of the connecting portion.

[0035] Preferably, each of the connecting portions is further provided with a plurality of fastening parts, such as fastening holes, through the connecting portion, and the position of the fastening parts is lower than the position of the connecting holes.

[0036] The advantages of this invention are as follows: the grip bar is easy to manufacture, can be hammered and punched using automated machinery, and can be manufactured quickly with precise structure. The manufactured grip bar is then placed into an injection mold to injection mold a counterweight, thus producing the grip assembly of this invention, which is easy and convenient to manufacture.

[0037] The structure of this invention combines a grip bar made of dissimilar materials with a counterweight base. The combination structure is reasonable, reliable, and stable. The grip bar and the two counterweight bases are connected through a through-hole, which provides good stability. At the same time, the cylindrical lip of the counterweight base covers the connecting part of the grip bar. The design of the cross-section of the connecting part is not a single configuration, which can improve the combination strength between the grip bar and the counterweight base and prevent the counterweight base from separating from the grip bar. Attached Figure Description

[0038] The objectives, features, and effects achieved by this invention can be understood from the following description and drawings of preferred embodiments, wherein:

[0039] Figure 1 This is a perspective view of a grip assembly of a fitness equipment according to a preferred embodiment of the present invention, with a dumbbell grip assembly as an example.

[0040] Figure 2 yes Figure 1 An exploded perspective view of the grip assembly.

[0041] Figure 3 yes Figure 1 The front view of the grip component.

[0042] Figure 4 yes Figure 3 A cross-sectional view along section 4-4.

[0043] Figure 5 yes Figure 3 A cross-sectional view along section 5-5.

[0044] Figure 6 yes Figure 3 A cross-sectional view along section 6-6.

[0045] Figure 7 yes Figure 3 A cross-sectional view along section 7-7.

[0046] Figure 8 This is a flowchart illustrating the manufacturing process of the grip assembly of a fitness equipment according to a preferred embodiment of the present invention.

[0047] Figure 9 A schematic diagram of a fitness equipment is shown, including the grip assembly of the present invention.

[0048] 10 grip components

[0049] 20 Grip Bar 22 Grip Section 24 Connecting Section

[0050] 25 Embossing 26 Connecting part 261 Inner end

[0051] 262 outer end 28 columnar body 30 connecting hole

[0052] 32 buckle holes

[0053] 40 Counterweight seat 42 Main body 421 Inner end

[0054] 422 Outer end 43 Front body 44 Rear body

[0055] 45. Connecting part; 46. Rib; 47. Top wall

[0056] 48 Support ribs 51 Inner end plate 511 Lip

[0057] 52 Outer end plate 55 Accommodation space 56 Spacer

[0058] 60 counterweights, 65 base Detailed Implementation

[0059] This invention provides a grip assembly for fitness equipment and its manufacturing method. Please refer to [link / reference]. Figure 9 The fitness equipment mentioned is a handheld exercise tool, such as a dumbbell or barbell, and the grip assembly is a component of the dumbbell or barbell. For example, please refer to [link to dumbbell example]. Figure 9 The grip assembly 10 and a plurality of counterweights 60 constitute a dumbbell. It is preferable that each of the counterweights 60 has a different weight. By combining the grip assembly 10 with different numbers or weights of counterweights 60, the dumbbell can be adjusted to different weights. When the counterweights are separated from the grip assembly 10, they are placed on a base 65.

[0060] Please see Figures 1 to 3 The grip assembly 10 provided in a preferred embodiment of the present invention includes: a grip bar 20 and two counterweight seats 40, the two counterweight seats 40 being respectively assembled at both ends of the grip bar 20. The present invention combines the grip bar 20 and the counterweight seats 40 of different materials.

[0061] The grip 20 is made of a metal tube of suitable length, preferably a steel tube, and has: a grip portion 22 and two connecting portions 24; the grip portion 22 is the central part of the grip 20, for the user to hold, and has a circular outline. Please refer to the reference section. Figures 4 to 6 The two ends of the grip 20 are struck to form the two connecting portions 24. The two connecting portions 22 are flattened into flat rectangles and are located at the two ends of the grip portion. The grip portion 22 is not struck and maintains its circular outline. Two connecting portions 26 are respectively disposed between the two ends of the grip portion 22 and the two connecting portions 24, connecting the grip portion 22 and the connecting portion 24 with different outlines. Each connecting portion 26 has an inner end 261 and an outer end 262. The inner end 261 has a circular or elliptical outline, while the outer end 262 has a flattened outline. The outer outline of each connecting portion 26 gradually changes from the circular or elliptical shape of the inner end 261 to the flattened shape of the outer end 262, such as... Figure 2 and Figure 7 As shown. The inner end 261 of each connecting portion 26 is connected to one end of the gripping portion 22, and its outer end 262 is connected to one end of a connecting portion 24. Furthermore, please refer to... Figure 2 and Figure 7 In practice, before striking both ends of the grip 20, a cylindrical body 28, such as a metal tube or a solid metal cylinder, can be inserted into the grip 20. This cylindrical body 28, located at the grip portion 22, increases the structural strength of the grip portion 22. This prevents deformation of the grip portion 22 during striking. The outer circumferential surface of the grip portion 22 can be embossed 25 to provide a non-slip surface.

[0062] A predetermined number of connecting holes 30 and a predetermined number of fastening portions are provided on the two connecting portions 24. The fastening portions are components used to connect with the counterweight, and can be the fastening holes 32 shown in this embodiment or other structural types. The connecting holes 30 and fastening holes 32 are formed on the two connecting portions 24 by stamping and penetrate the front and rear sides of the two connecting portions 24. In this preferred embodiment, the connecting holes 30 on each connecting portion 24 are arranged in a horizontal row, and the fastening holes 32 are also arranged in a horizontal row, with the position of the connecting holes 30 higher than the position of the fastening holes 32.

[0063] Each counterweight 40 is injection molded from plastic material and has a main body 42, an inner end plate 51, and an outer end plate 52. The main body 42 has an inner end 421 and an outer end 422; the inner end plate 51 and the outer end plate 52 are respectively disposed at the inner end 421 and the outer end 422 of the main body; the main body 42 covers a connecting portion 24, and the material of the main body 42 passes through the connecting hole 30. For details, please refer to [link to relevant documentation]. Figures 1-3 and Figure 6 , Figure 7The main body 42 has a front body 43, a rear body 44, and a plurality of through-holes 45 on its bottom side. The front body 43 and the rear body 44 respectively adhere to the front and rear sides of each connecting part 24. The bottom side of the main body 42 covers the locations of the connecting holes 30, allowing the material of the main body 42 to pass through the connecting holes 30 and form the through-holes 45. The front and rear ends of each through-hole 45 are respectively connected to the front body 43 and the rear body 44, so that the counterweight 40 and the connecting part 24 of the handle 20 can be stably connected. The buckle hole 32 on the connecting part 24 is not covered by the counterweight 40 and remains exposed on the connecting part.

[0064] The main body 42 forms an accommodating space 55 between the inner end plate 51 and the outer end plate 52 for the counterweight 60 to be accommodated in the accommodating space 55. Furthermore, the front and rear sides of the main body 42 have several upright ribs 46 protruding forward and backward, respectively. These ribs 46 are spaced appropriately and divide the accommodating space 55 into a plurality of compartments 56. Preferably, these compartments 56 have different sizes to accommodate counterweights 60 of different weights. The fastening holes 32 on each connecting portion 24 correspond to the positions of each compartment 56. When each counterweight 60 is engaged with the grip assembly 10, it is fastened to a fastening hole 32 and located in a compartment 56. The manner in which the counterweight 60 engages and disengages from the fastening holes 32 is not the subject of this invention and will not be described in detail.

[0065] Furthermore, each counterweight 40 extends a cylindrical lip 511 from its inner end plate 51 toward the grip portion 22 of the handle 20, covering each connecting portion 26 to increase the bonding strength between the counterweight 40 and the handle 20. Since the outer end 262 of each connecting portion 26 has a larger outer diameter, the lip 511 covers the connecting portion 26, making it difficult for it to detach from the larger-diameter connecting portion 26, thus preventing the counterweight 40 from separating from the handle 20. Moreover, the top edge of the main body 24 of each counterweight 40 is provided with a top wall 47 with a wall thickness greater than that of the main body 42, such that the front and rear edges of the top wall 47 protrude beyond the front and rear sides of the main body 42, as shown below. Figure 1 , Figure 2 and Figure 6 As shown, a plurality of oblique support ribs 48 connect the front and rear sides of the top wall 47 and the main body 42, which can enhance the structural strength of the counterweight 40, prevent its deformation, and enable the counterweight 40 to stably support the counterweight 60.

[0066] The grip assembly 10 of the present invention is manufactured by the method of the following preferred embodiment. Please refer to... Figure 8 The process described includes, but is not limited to, the following steps:

[0067] Step 1: Prepare a grip: Take a metal tube and flatten both ends of the metal tube to make an unformed grip 20, so that an un-hammered grip part 22 is formed in the center of the grip 20, and flat connecting parts 24 are located at both ends of the grip part 22.

[0068] Step 2: Punch holes and set fastening parts, such as fastening holes 32, on the two connecting parts 24 so that the two connecting parts 24 have a plurality of through connecting holes 30 and fastening holes 32, thus completing a grip bar 20. The position of the fastening holes 32 is lower than the position of the connecting holes 30.

[0069] In step one or step two, the outer surface of the grip portion 22 may be treated with anti-slip treatment. In this preferred embodiment, the surface of the grip portion 22 is embossed 25 to form an uneven anti-slip surface.

[0070] Step 3: Injecting and molding counterweight seats 40 at the connecting portions 24 at both ends of the grip: The grip 20 is inserted into an injection mold, and a plastic counterweight seat 40 is injected and molded at each of the two connecting portions 24, so that the two counterweight seats 40 cover the two connecting portions 24 of the grip 20. The coverage area of ​​each counterweight seat 40 covers the connecting hole 30 of the connecting portion 24, but does not cover the fastening part (fastening hole 32), so that the material of the counterweight seat 40 extends into the connecting hole 30 of the connecting portion 24 and is connected to the connecting hole; each counterweight seat 40 has a receiving space 55 for accommodating the counterweight.

[0071] 4. After the two counterweight seats 40 are formed, the grip bar and the two counterweight seats are removed from the mold, thus forming the grip assembly 10 of the fitness equipment. The buckle holes 32 are exposed on the two connecting parts 24 for the counterweights to be connected to the grip assembly.

[0072] In the semi-finished product of the grip 20 made in step one, the grip portion 26 has a circular or elliptical outline, while the two connecting portions 24 are flat. One end of the grip portion 22 is connected to each connecting portion 24 by a connecting portion 26. One end (inner end) 261 of the connecting portion 26 is connected to one end of the grip portion 22, while its other end (outer end) is connected to one end of the connecting portion 24. The outer outline of the connecting portion 26 gradually changes from the circular or elliptical outline of the one end (inner end) 261 to the flat outline of the other end (outer end) 262. In step three, one end of each counterweight 40 has a cylindrical lip 511 that covers each connecting portion 26.

[0073] The grip bar 20 of the present invention is easy to manufacture. It can be hammered and punched by automated machinery, which can produce it quickly and with precise structure. The manufactured grip bar 20 is placed into an injection mold to injection mold the counterweight 40, thus producing the grip assembly 10 of the present invention, which is easy and convenient to manufacture.

[0074] The structure of this invention combines a grip bar made of dissimilar materials with a counterweight base. The combination structure is reasonable, reliable, and stable. The grip bar and the two counterweight bases are connected through a through-hole, which provides good stability. At the same time, the cylindrical lip of the counterweight base covers the connecting part of the grip bar. The design of the cross-section of the connecting part is not a single configuration, which can improve the combination strength between the grip bar and the counterweight base and prevent the counterweight base from separating from the grip bar.

[0075] This invention provides a novel assembly structure and manufacturing method for the grip components of fitness equipment, which improves upon the shortcomings of prior art and enhances its effectiveness. The embodiments of this invention are merely illustrative of its features and not intended to limit it; all equivalent modifications made to this invention should be considered within the scope of protection of this invention.

Claims

1. A grip assembly for fitness equipment, characterized in that: Includes: one grip bar and two counterweight seats; The grip bar has: a gripping part and two connecting parts; The grip is located in the center of the handle; The two connecting parts are flat geometric shapes and are located at both ends of the gripping part; a predetermined number of connecting holes are provided on the two connecting parts and penetrate the front and rear sides of the two connecting parts; and The two counterweights each have an accommodating space and are respectively located at the two connecting parts. Each counterweight covers the connecting part, and the material of the counterweight passes through the connecting hole and is connected to the connecting hole.

2. The grip assembly of the fitness equipment as described in claim 1, characterized in that: Each of the connecting parts is further provided with a plurality of fastening parts, which are exposed on the connecting part, located in the accommodating space, and are not covered by the counterweight seat.

3. The grip assembly of the fitness equipment as described in claim 1, characterized in that: The grip includes two connecting portions, which are respectively connected between one end of the grip portion and one end of the connecting portion. Each connecting portion has an inner end and an outer end. The inner end has a circular or elliptical outline, and the outer end is flat. The inner end of the connecting portion is connected to one end of the grip portion, and the outer end is connected to one end of the connecting portion.

4. The grip assembly of the fitness equipment as described in claim 3, characterized in that: The outer contour of each connecting part of the grip gradually changes from a circle or ellipse at its inner end to a flat shape at its outer end.

5. The grip assembly of the fitness equipment as described in claim 3 or 4, characterized in that: The two counterweights cover the two connecting parts at one end.

6. The grip assembly of the fitness equipment as described in claim 1, characterized in that: Each counterweight has a main body, an inner end plate, and an outer end plate. The main body has an inner end and an outer end. The inner end plate and the outer end plate are respectively disposed at the inner end and the outer end of the main body. Each counterweight covers the connecting portion with its main body, and the material of the main body passes through the connecting hole. Each accommodating space is formed between the inner end plate and the outer end plate of each counterweight.

7. The grip assembly of the fitness equipment as described in claim 6, characterized in that: The main body of the counterweight is spaced apart by a plurality of intervals between the inner end plate and the outer end plate.

8. The grip assembly of the fitness equipment as described in claim 6, characterized in that: Each counterweight has a number of ribs protruding from its main body to maintain spacing. Between the inner end plate and the outer end plate, the ribs create a plurality of spacers. Each connecting part has a plurality of fastening parts, which are exposed on the connecting part and located in the spacers respectively.

9. The grip assembly of the fitness equipment as described in any one of claims 6 to 8, characterized in that: The main body has a front part and a rear part, which respectively attach to the front and rear sides of each connecting part; a plurality of through parts are inserted into the connecting holes and connect the front part and the rear part.

10. The grip assembly of the fitness equipment as described in claim 5, characterized in that: Each counterweight seat extends a lip from one end toward the gripping part of the handle, covering each connecting part.

11. The grip assembly of the fitness equipment as described in claim 10, characterized in that: Each counterweight has a main body, an inner end plate, and an outer end plate. The main body has an inner end and an outer end. The inner end plate and the outer end plate are respectively disposed at the inner end and the outer end of the main body. Each base covers each connecting portion with the main body, and the material of the main body passes through the connecting hole. Each accommodating space is formed between the inner end plate and the outer end plate of each counterweight. The lip extends from the inner end plate to the grip portion of the handle.

12. The grip assembly of the fitness equipment as described in any one of claims 6 to 8, characterized in that: Each counterweight seat has a top wall with a wall thickness greater than that of the main body, and the front and rear edges of the top wall protrude from the front and rear sides of the main body; a plurality of support ribs connect the top wall to the front and rear sides of the main body.

13. A method for manufacturing a grip assembly for fitness equipment, characterized in that: It includes the following steps:

1. Preparation of a grip: Take a metal tube and flatten both ends of the metal tube to form an un-hammered grip in the center of the grip, and flat connecting parts at both ends of the grip.

2. Punch holes in the two connecting parts to give them through connecting holes; 3. Injecting counterweights at both ends of the grip: The grip is inserted into an injection mold, and a plastic counterweight is injected at each of the two connecting parts, so that the two counterweights cover the two connecting parts and cover the connecting holes of the two connecting parts, so that the material of the counterweights is combined with the connecting holes of the connecting parts. Fourth, once the two counterweights are formed, the grip assembly of the fitness equipment is manufactured.

14. The manufacturing method as described in claim 13, characterized in that: In step two, a fastening part is provided at the two connecting parts; in step three, when the two counterweights are ejected, the two counterweights are made not to cover the fastening part.

15. The manufacturing method as described in claim 13, characterized in that: Each counterweight seat has an inner end plate and an outer end plate at its two ends, and the inner end plate and the outer end plate form a plurality of spaces for accommodating the counterweight.

16. A grip bar of a grip assembly for fitness equipment, characterized in that: The grip bar has: a gripping part and two connecting parts; The grip is located in the center of the handle and is in the shape of a cylindrical tube; The two connecting parts are flat geometric shapes and are located at both ends of the gripping part; a predetermined number of connecting holes are provided on the two connecting parts and penetrate the front and rear sides of the two connecting parts; and Two connecting portions are respectively connected between one end of the grip portion and one end of the connecting portion. Each connecting portion has an inner end and an outer end. The inner end has a circular or elliptical outline, and the outer end is flat. The inner end of the connecting portion is connected to one end of the grip portion, and the outer end is connected to one end of the connecting portion.

17. The grip bar of the grip assembly of the fitness equipment as described in claim 16, characterized in that: Each of the connecting parts is further provided with a plurality of fastening parts, the positions of which are lower than the positions of the connecting holes.

Images