KR101809083B1 - Heading practice device - Google Patents

Abstract

The head lifter according to the present invention comprises: a vertical support having a support formed of a vertically installed long pipe; and a horizontal rotation part having a horizontal stand installed to be horizontally rotatable around the support on the vertical support part; And a mounting part having one end connected in the horizontal direction and the other end hanging the ball. In the present invention, a ball can be moved by rotating a horizontal bar suspended from a ball at a predetermined height, so that a player can practice heading for a ball moving alone.

Description

{HEADING PRACTICE DEVICE}

The present invention relates to a heading exerciser capable of performing heading exercises using a hanging ball. More particularly, the present invention relates to a heading exerciser capable of adjusting the height of a heading exerciser and exercising heading exercises for a moving ball alone.

In soccer games, it is acceptable to control the ball with the head, and during the game, the player takes a lot of time to practice the heading because the ball is taken as head and the shot by the heading is frequently tried.

However, the conventional heading practice method has a disadvantage in that it is difficult to practice by yourself because it is performed by a method in which another person throws the ball by hand or takes a ball that is kicked by a kick.

In order to solve such a problem, Korean Patent Laid-Open No. 10-2015-0073333 (hereinafter referred to as "Gugi Practice Organization", hereinafter referred to as "prior art") has been proposed.

The prior art includes a vertical frame installed vertically on the upper surface of a post installed at each of four corners, a vertical frame allowing the ball hanging from the rope to stand at a certain height from the ground while supporting the rope, And a rope stopper means for releasing the rope so that the ball and the rope extend together in the striking direction while the players are hitting the ball with the head or foot while the rope is fixed, will be.

Therefore, in the prior art, when the player hits the ball with his head or foot while the ball is hanged at a certain height, the ball is extended with the rope in a state of hanging from the rope so that the player can directly see whether the ball is sent in the desired direction It is an invention that has the advantage of being able to practice by checking.

However, in the prior art, since the vertical frame is fixedly installed on the post, it is difficult to freely adjust the height of the vertical frame. In addition, since the horizontal frame bent at the upper portion of the vertical frame is also integrally fixed to the vertical frame and can not move, the ball mounted thereon remains stationary at a predetermined position. Therefore, there is a problem that the athlete must perform the heading or kick practice only for the ball in the stop state at all times.

Korean Patent Publication No. 10-2015-0073333

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a technique structure capable of making a ball move by rotating a horizontal stand suspended at a predetermined height.

Another object of the present invention is to provide a technology structure for adjusting the height of a support stand vertically erected, and a technique for easily adjusting the height of the support stand or the degree of improvement of a jump force of a player.

It is yet another object of the present invention to provide a technique structure capable of reducing the impact of a body part that is in conflict with a ball.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a heading exerciser comprising: a vertical support having a support formed by a vertically installed long pipe; and a horizontal support unit installed horizontally rotatable about the support, A horizontal rotating part having a stand; And a mounting part having one end connected in the horizontal direction and the other end hanging the ball.

The vertical supporting part includes a lower supporting part and an upper supporting part installed so as to be able to move forward and backward into the lower supporting part. The supporting part fixing device for fixing the upper supporting part pulled out from the lower supporting part .

The horizontal rotation unit may include a horizontal rotation unit having a horizontal axis through-hole provided to penetrate the horizontal band and a supporting frame coupling hole to which the upper end of the supporting frame is coupled.

In this case, the support bar coupling hole may be configured such that one end thereof is inserted into the upper inner hollow portion of the support bar, the other end thereof is fixedly coupled to the support bar coupling hole, and the core having the bearing coupled thereto is inserted into the outer surface thereof.

The mounting portion includes a vertical rotation ring coupled to the horizontal bar so as to be rotatable around the horizontal bar, and a long rod type having flexibility, one end connected to the vertical rotation ring, and the other end mounted with a ball And a connecting rod to which a cooperating hole capable of being coupled is combined.

To this end, a connecting rod coupling for connecting the vertical rotating ring and the connecting rod is provided, and the connecting rod coupling is formed in a hollow cylindrical shape and has a threaded portion coupled to the upper rotating ring at an upper end thereof, And a connecting rod may be inserted into the lower end.

The heading exerciser of the present invention can create a situation in which the ball is moved by rotating the horizontal bar suspended from the ball at a predetermined height, so that it is possible to practice the heading for the ball in which the athlete moves alone.

In addition, since the height of the vertical support stand can be adjusted, the height of the ball can be adjusted to the height of the athlete to enable efficient training, and the numerical display means indicated on the support can simplify the setting of the support height, It is possible to obtain an effect of measuring whether or not the jump force is improved.

In addition, the present invention has a means for absorbing an impact force generated when a ball is hit by a body part such as a head or a hand, thereby preventing the player from being injured.

1 is a perspective view showing the overall configuration of the present invention;
2 is a cross-sectional view showing the main configuration of the vertical support portion of the present invention
3 is a cross-sectional view showing a core configuration of the horizontal rotary part of the present invention
Fig. 4 is a perspective view of the overall configuration of the mounting portion of the present invention and an enlarged cross-

Hereinafter, a heading exerciser according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the thicknesses of the lines, the sizes of the components, and the like shown in the drawings may be exaggerated or reduced for convenience in order to more clearly understand the structure of the present invention.

The terms used for describing the present invention are terms defined in consideration of the functions of the present invention. However, since these terms can be expressed in other terms depending on the intention or custom of the designer or the user, the definition of these terms used in the present invention should be made in consideration of the contents described throughout the specification.

It is to be understood that within the scope of the present invention, directional terms such as 'top', 'bottom', 'front', 'back', 'left', 'right', 'front', 'front', 'rear' Quot; is based on the orientation of the disclosed drawing (s). And since the elements of the embodiments of the present invention can be positioned in various orientations, the directional terminology is used for illustrative purposes and not limitation.

In the case where the constituent elements used in the present invention are referred to as being 'connected', 'coupled' or 'contracted', the 'connected', 'coupled' or 'contracted' As used herein.

In the following description, well-known functions or constructions are not described in detail since they would unnecessarily obscure the gist of the invention.

Referring to FIG. 1, the heading exerciser according to the embodiment of the present invention may be divided into a vertical support portion 20, a horizontal rotation portion 20, and a mounting portion 40. In addition, the structure of the pedestal 10 can be further added.

The vertical supporting part 20 has a vertical supporting part as a core, and other main components are installed on the basis of the supporting part as described later.

Referring to FIG. 1, in this embodiment, the support of the vertical support part 20 is formed by a vertically erected long pipe, and the upper support part 22 and the lower support part 21 can be separated from each other.

2, the lower support 21 is formed by a pipe having a hollow therein, and the upper support 22 is formed by a pipe having an outer diameter smaller than the hollow diameter of the lower support, Is inserted from the upper part of the lower support (21) into the hollow. The length of the entire support can be adjusted by drawing the upper support 22 inserted into the lower support 21 to the upper portion of the lower support 21 by a desired length.

In addition, as shown in FIG. 2, a pedestal coupling member 25 may be provided at the lower end of the lower pedestal 21. The pedestal coupling member 25 of this embodiment has a cylindrical body fitted to the inner hollow portion of the lower support table 21 and a screw coupling portion 26 in the form of a bolt, which protrudes to the lower portion of the body. When the threaded portion 26 is fastened to the receiving portion 10 shown in FIG. 1, the lower support 21 can be vertically erected.

On the outer surface of the upper support 22, a groove 23 with a closed bottom is elongated in the longitudinal direction. The groove 24 serves as a position for inserting the end of the support rod fixing member 28 to be described later and also serves as a guide for securing the linearity of the upper support rod 22 when the upper support rod 22 is moved up and down.

Also, the upper support 22 can display a scale (not shown) indicating the dimensions on the surface, as shown in Fig. As a result, the athlete can accurately set the height of the ball to match his or her height, and it is also possible to measure the degree of increase in the jump force of the athlete.

2 is a device used for fixing the pulled-up upper support 22 on the lower support 21. As shown in FIG.

In this embodiment, the support stand fixing device 23 is formed in the form of a hollow body having a hollow therein. The lower support 21 is fitted to the lower part of the cylindrical hollow and the upper support 22 is fitted to the upper part.

As shown in FIG. 2, the upper support 22 is inserted into the lower support 21 in the hollow of the support 23. For this purpose, The inner diameter of the lower portion into which the lower support 21 is inserted is formed larger than the inner diameter of the upper portion into which the upper support 22 is inserted.

The coupling between the support device fixing device 23 and the inserted lower support 21 is made by a fastener 29. The fastener 29 can be a bolt, and is installed to penetrate the cylindrical body constituting the support restraining device 23 from the outside and to tighten the outer surface of the lower support.

The coupling fixation between the support fixture 23 and the inserted upper support 22 consists of a support fixture 28. The support stand fixture 28 may be formed in the form of a screw formed in a bag portion attached to a handle, and may be replaced with a general bolt if necessary.

The support fixture 28 is also installed so that the end of the support part can penetrate the cylindrical body constituting the support fixture 23 from the outside and tighten the outer surface of the upper support 22. This has the effect that the upper support 22 can be fixed so as not to move up and down.

At this time, after the end of the bag end of the support stand fixture 28 is inserted into the groove 24, there is also a tilting operation so as to come into close contact with the bottom of the groove. In this case, the upper support 22 can be prevented from moving up and down as well as the upper support 22 can be prevented from rotating about the longitudinal axis of the support by external force.

When the distal end of the upper support 22 is moved away from the bottom of the groove 24, the movement of the upper end of the upper support 22 is guided by the groove 24 into which the end of the stem is inserted, The straightness can be ensured.

The horizontal rotation unit 30 shown in FIG. 3 includes a horizontal support 31 which is horizontally rotatable about the support base at an upper portion of the vertical support unit 20.

The horizontal base 31 can be formed of a simple circular or square pipe. In this embodiment, the upper support 22 is formed of a pipe having the same structure as that of the upper support 22. Thus, as shown in Fig. 1, a groove 32 formed long in the longitudinal direction and a scale do.

The horizontal rotation unit 30 includes a horizontal rotation unit 33 that is coupled to the upper end of the upper support 22 to rotate the horizontal support 31.

As shown in Figs. 1 and 3, the horizontal rotating device 33 of this embodiment has a generally cylindrical body, and a horizontal base through hole 35, which is a hole through which the horizontal base 31 is inserted, Is formed on the upper side.

At this time, when the load received by the horizontal support 31 is supported only by the cylindrical body, the contact area between the horizontal support 31 and the body is narrow, so horizontal horizontal deformation due to the concentrated load tends to occur.

Therefore, in this embodiment, the horizontal support 34 formed of a hollow pipe having a predetermined length is first inserted into the horizontal support hole 35, and then the horizontal support 31 is inserted into the horizontal support 34 So as to penetrate and install it. In this case, since the contact area between the horizontal base 31 and the horizontal base support 34 is widened, horizontal horizontal deformation due to the concentrated load can be prevented.

The fixing of the horizontal support 34 inserted in the horizontal through-hole 35 is made by a fastener 38. The fixture 38 may be formed by forming a screw in the bag portion attached to the handle, and may be replaced with a general bolt if necessary. The fixture 38 is installed to penetrate the upper surface of the cylindrical body of the horizontal rotary device 33 and to tighten the outer surface of the horizontal support 34.

The auxiliary fixture 39 is also installed to be able to tighten the outer surface of the horizontal support 34 through the upper surface of the cylindrical body of the horizontal rotary device 33 and can be constituted by a normal bolt. The auxiliary fixture 39 is used for supplementing the fixture 38 when the fixing force of the fixture 38 is insufficient, and may be omitted if not necessary.

These fasteners 38 and 39 function to fix the horizontal support 34 so as not to move left and right.

Meanwhile, in the horizontal rotary device 33 of this embodiment, the support frame coupling holes 37 are formed on the lower surface of the body, and the upper support frame 22 is fitted and coupled.

3, a core insertion hole (not shown) having a diameter smaller than that of the support arm engagement hole 37 is formed on the upper portion of the support arm engagement hole 37. As shown in Fig. The core insertion hole is a hole into which an upper portion of a core 50 to be described later is inserted. On the inner wall surface of the core insertion hole, a screw hole is formed through which the fastener 53 and the auxiliary fastener 52 penetrate from the outside.

The inner diameter of the support base coupling hole 37 is formed to be larger than the outer diameter of the upper support base 22 to be inserted so that a gap is formed between the inner surface of the support base coupling hole 37 and the outer surface of the upper support base 22 . This clearance prevents friction between the support pin engagement hole 37 and the upper support 22 when the horizontal rotary device 33 rotates.

In this embodiment, a cylindrical core 50 is provided at the center of the support base engagement hole 37. At this time, the upper portion of the core is inserted into the core insertion hole formed at the center upper portion of the support arm engagement hole 37.

A fixing groove 54 and an auxiliary fixing groove 55 may be formed on the outer surface of the inserted core. The positions of the fixing groove 54 and the auxiliary fixing groove 55 are formed such that the ends of the fixing member 53 and the auxiliary fixing member 52, which will be described later, correspond to the position where the ends of the fixing member 53 and the auxiliary fixing member 52 pass through the body of the horizontal rotating unit 33 to be.

When the fastener 53 is tightened, the end of the bag portion is strongly adhered to the outer surface of the core 50, so that the body of the horizontal rotating device 33 The inserted cores 50 are coupled to each other. If the fixing groove 54 is formed on the outer surface of the core 50, the end of the fixing part 54 will be strongly adhered to the bottom of the fixing groove 54 of the fixing part. The fixture 53 may be replaced with a conventional bolt if necessary.

The auxiliary fixture 52 functions in a similar manner to the fixture in a configuration additionally provided for more stably fixing the core 50 to the body. The auxiliary fastener 52 may be formed of a common bolt, and may be omitted if not necessary.

On the other hand, there may occur a situation where the fastener (53) and the auxiliary fastener (52) are loosened so that the distal end of the outer surface of the core or the bottom of the grooves (54, 55) In this case, if the grooves 54 and 55 are not provided on the outer surface of the core 50, the core 50 inserted into the horizontal rotator 33 may be easily detached. However, when the fixture groove 54 and the auxiliary fixture groove 55 are present, the ends of the fixture 53 and the auxiliary fixture 52 are still attached to the wall surfaces of the grooves 54 and 55, The core 50 inserted into the body of the core 50 is not easily separated.

The diameter of the lower portion of the core 50 located in the support fitting hole 37 is formed to be slightly smaller than the inner diameter of the upper support 22. Accordingly, when the cylindrical core 50 is installed at the center of the support arm engagement hole 37, a space is formed in which the upper support arm 22 can be inserted, as shown in FIG. In the space thus formed, a bearing 51 surrounding the outer surface of the core 50 is installed.

The bearing 51 of this embodiment shown in Fig. 3 is a thrust bearing. When the upper support member 22 is fitted into the support member engagement hole 37, the bearing is installed between the upper surface of the upper support member 22 and the upper surface of the support member engagement hole 37. Therefore, the body of the horizontal rotating device 33 can smoothly rotate on the upper surface of the upper support 22.

The mounting portion 40 shown in FIG. 4 is installed in a hanging form on the horizontal base 31, and the hole 70 is hung on the end hanging downward.

The mounting portion 40 includes a vertical rotation ring 43 coupled to the horizontal bar 31 and a connecting rod 41 having one end connected to the vertical rotation ring 43 and the other end mounted with a hole 70, Respectively.

The inner diameter of the vertical rotation ring 43 is slightly larger than the outer diameter of the horizontal base 31. The vertical rotation ring 43 is formed in a ring shape, Respectively. As a result, the vertical rotation ring 43 can freely rotate about the horizontal support 31. [

The vertical rotation ring 43 is formed with two through holes passing through an inner surface and an outer surface of the ring so that one fastener 48 is fastened to one through hole and the other fastener is fastened to the threaded portion 64 are fastened.

The fixing member 48 is used when it is desired to fix the vertical rotating ring 43 so as not to rotate on the horizontal base 21. For this purpose, the fixture 48 is installed to be inserted into the groove 32 formed in the outer surface of the horizontal bar 21 through the vertical rotation ring 43. The fixture 48 may be formed by forming a screw in a bag portion attached to a handle, and may be replaced with a conventional bolt if necessary.

As shown in Fig. 3, one stopper 44 may be provided on the side of the vertical rotation ring 43, or a pair of left and right stoppers 44 may be additionally provided. When the stopper 44 is thus installed, the vertical rotation ring 43 is caught by the stopper 44 and prevented from moving on the horizontal table 31.

The stopper 44 of this embodiment is formed in a thin ring shape and has a fastening hole 49 for fixing the stopper by tightening the outer surface of the horizontal base 31 or the bottom surface of the groove 32 through the ring. The fastener 49 can be formed of a normal bolt. When the fastener 49 is loosened, the position of the stopper 44 can be moved on the horizontal base 31.

A connecting rod (41) is connected to the vertical rotating ring (43). The connection block 41 may be formed by molding a flexible synthetic resin such as a urethane resin into a long rod shape or using a flexible material such as a rope or a leather strap.

At the upper end of the connecting rod 41, a connecting rod coupling hole 60 for connecting the vertical rotating ring 43 is provided.

In the present embodiment, the connecting rod coupling member 60 is formed in a cylindrical shape having an inner hollow portion, and a screw coupling portion 64 is formed on the upper surface thereof to be screwed with the through hole of the vertical rotating ring 43. And the lower surface of the connecting rod 41 is opened to be inserted into the hollow portion.

In addition, a long hole 62 is formed on a side surface of the connection block 41 to a predetermined length. A coupling hole 61 is inserted into the slot 62 and one end of the coupling hole 61 is inserted into the coupling slot 41 inserted into the coupling hole 60 to be fastened. As a result, the connecting rod 41 is coupled to the connecting rod coupling hole 60. The coupling hole 61 may be a normal bolt or a screw.

A spring (63) is provided between the upper surface of the inner hollow portion of the connecting rod coupling hole (60) and the upper surface of the inserted connecting rod (41). At this time, the spring 63 adjusts its compressive force so that the spring 63 is in a state of pushing the connecting rod 41 outwardly with an appropriate force. Therefore, the coupling hole 61 is engaged with the lower end of the elongated hole 62 (see FIG. 4).

A ball is suspended to the lower end of the connecting rod 41. To this end, a ball coupling port 65 for mounting the ball 70 is coupled to the lower end of the connecting rod.

A hole for inserting the connecting rod 41 is formed in the upper part of the hole 65. When the connecting rod 41 is inserted into the hole, the connecting rod 67 passes through the side of the hole 65, ). As a result, the connecting rod 41 is engaged with the ball joint 65.

A hole 70 is attached to the lower end of the hole 65. A method of mounting the hole 70 to the hole 65 is well known in the art such as adhesion.

The reference numeral 80 denotes a stopper which serves to close both ends of the horizontal base 31 for the purpose of aesthetics and a reference numeral 66 denotes a lid which covers the joint portion between the hole 70 and the hole 65, .

Hereinafter, the operation of the heading exerciser according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

A player who wishes to use the heading exerciser of the present invention releases the fixture 28 of the support fixture 23 shown in FIG. 2 to move the upper support 22 up and down. When the upper support 22 is moved up and down, as shown in FIG. 1, the holes 70 hanging at both ends of the horizontal stand 31 are also moved up and down. When the ball reaches a suitable height, the fixture (28) of the support fixture (23) is tightened to fix the upper support (22).

At this time, the scale shown on the surface of the upper support 22 is checked, and the height of the upper support 22 can be adjusted by adjusting only the indicated scale at the next exercise. If the athlete wishes to ascertain the degree of improvement of the jump force for the heading, the heading height he exercises for a predetermined period may be confirmed by the scale indicated on the surface of the upper support and recorded.

In addition, if the length of the horizontal bar 31 is adjusted so that one of the horizontal bar 31 is pulled out longer with respect to the horizontal rotary device 33, the horizontal position of the ball may be adjusted accordingly.

After adjusting the height of the upper support and adjusting the length of the horizontal bar, the player pushes the horizontal bar (31) to rotate. That is, when the horizontal base 31 is pushed, the body of the horizontal rotary device 33 easily rotates on the upper support 22 by the bearing 51 of the horizontal rotary device 33 as shown in FIG.

As a result, the ball 70 suspended at both ends of the horizontal table 31 also rotates, so that the player can practice the timing of heading to the ball 70 rotating and moving. At this time, if the strength of the pushing force of the horizontal bar 31 is adjusted, the rotational speed of the hanging hole 70 can be adjusted, so that effective heading exercises can be performed on various ball speeds.

On the other hand, if the ball 70 is suspended in a form fixed firmly to the horizontal base 31, the head of the athlete heading the ball 70 may receive a large impact load, which may cause injury.

In order to mitigate such an impact, the present invention forms an air-suspended linkage 41 of a flexible material.

In addition, by adopting the configuration of the long hole 62 and the spring 63 as shown in FIG. 4, the impact force transmitted to the connecting rod 41 at the heading can be compressed and absorbed by the spring 63.

When the fastener 48 shown in FIG. 4 is loosened, the vertical rotation ring 43 can rotate around the horizontal table 31 as shown by the arrows at both ends of the horizontal table 31 shown in FIG. 1, The ball 70 connected to the vertical rotation ring 43 by the connecting rod 41 can also rotate vertically about the horizontal axis. Therefore, the impact energy generated when the ball is headed is dispersed as kinetic energy while the ball 70 rotates about the horizontal base 31.

Meanwhile, the present invention can be used for a practice such as a spike of volleyball or a kick of a taekwondo. However, since the impact energy generated when hitting the ball with the hand or foot is incomparably greater than that caused by the heading, it is very important to disperse the ball 70 into the kinetic energy by rotating the ball 70 vertically around the horizontal base 31 .

The present invention has the advantage of being able to reduce the impact force applied to the body by the ball by various methods as described above, and thus is advantageous for prevention of bow injury.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention should be understood only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention if they are apparent to those skilled in the art.

10:
20: vertical support
21: lower support 22: upper support
23: support base fixing device 24, 32:
25: pedestal coupling member 26, 64:
28, 38, 48, 53: fixture 29, 49: fastener
30:
31: horizontal unit 33: horizontal rotating unit
34: horizontal base zone 35: horizontal base zone
36: support rod coupling portion 37: support rod coupling hole
39, 52: auxiliary fixture
40:
41: connecting rod 43: vertical rotating ring
44: Stopper
50: core 51: bearing
60: connecting rod coupling hole 61, 67: coupling hole
62: Slot 63: Spring
64: screw coupling part 65: ball coupling part
66: Cover
70: Ball 80: Plug

Claims (6)

A horizontal support which is horizontally extended from the support at an upper part of the vertical support part, and a mounting part which is horizontally connected at one end and a mounting part at which the ball is suspended at the other end, In the exerciser,
And a horizontal rotation unit (30) having a horizontal rotation unit (33) for horizontally rotating the horizontal base (31) extending horizontally from the support base about the support base,
The horizontal rotary device 33 has a support base coupling hole 37 to which the upper end of the support base is coupled,
A core 50 having one end inserted into the upper inner hollow portion of the support base and the other end fixedly coupled to the support base engagement hole 37 and having a bearing 51 coupled to the outer surface thereof, Is inserted into the headrest.
2. The apparatus of claim 1, wherein the vertical support (20)
And the upper support part 22 is installed to allow the support part to move back and forth into the lower support part 21 and the lower support part 21,
Further comprising a support fixture (23) for fixing the upper support (22) drawn out from the lower support (21).
The apparatus according to claim 1, wherein the horizontal rotation unit (33) provided in the horizontal rotation unit (30)
And a horizontal base through hole (35) penetrating through the horizontal base (31).
delete The connector according to claim 1, wherein the mounting portion (40)
A vertical rotation ring 43 coupled to the horizontal table 31 so as to be rotatable about the horizontal table 31;
And a connecting rod 41 having an elongated rod shape having flexibility and one end connected to the vertical rotating ring 43 and the other end connected to a ball coupling hole 65 for mounting the ball 70 And a heading exercise machine.
6. The method of claim 5,
The vertical rotation ring 43 and the connecting rod 41 are connected to each other by a connecting rod engaging hole 60. The connecting rod engaging hole 60 is formed in a hollow cylindrical shape, And a threaded portion (64) which is engaged with the threaded portion (43), and a connecting rod (41) is inserted into the opened lower end.

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