HEIGHT-ADJUSTABLE GOLF TEE

Abstract

The present invention relates to a height-adjustable golf tee. According to the height-adjustable golf tee disclosed herein, a fixing member, a main body member, and a height-maintaining member are provided, and accordingly, the height of the main body member may be adjusted only with a simple manipulation of varying the height of the main body member with respect to the fixing member by transferring an external force. Even when the impact of a tee shot is transferred to the main body member, as well as a case in which the external force is removed, the impact can be buffered via the height-maintaining member and the adjusted height of the main body member can be maintained.

Description

TECHNICAL FIELD

The present invention relates to a height-adjustable golf tee.

BACKGROUND ART

Golf starts at a point of tee shot for each hole, and the tee shot is played with a golf ball floating in the air by a predetermined distance above a grassy ground.

A golf tee is to seat the golf ball for floating the golf ball at a predetermined height from the ground, which is a must-have item for playing golf.

In general, the golf tee is inserted to a predetermined depth into the ground together with the golf ball seated thereon by an external force pressed by a golfer, and since the golf tee is formed to have a limited length, there is a limitation in appropriately adjusting the height of the golf ball according to a ground state of a teeing ground.

For example, when a relatively long golf tee is used to prevent the golf tee from flying together during the tee shot, the golf tee is inserted deep into the ground, and when the golf tee is not inserted to a desired depth due to a relatively hard bottom of the teeing ground of a certain hole, the golfer is psychologically and adversely affected, and when the tee shot is performed by inserting the golf tee only to a depth at which the golf tee is inserted in order to reduce a time, there are frequent cases where the golfer does not satisfy the tee shot.

To prevent the above-described case, a height-adjustable golf tee has been invented, and Korean Registered Patent No. 10-1672441 (registration date: 2016.10.28, title of the invention: height-adjustable golf tee) and the like may be presented as an example of the height-adjustable golf tee.

However, according to the conventional height-adjustable golf tee of the presented patent document described below, the height of the golf tee, which was adjusted by an impact of swing transmitted to the golf tee during the tee shot, was frequently changed, and a structure of the golf tee was also complicated, and thus there was a limitation in actual application as the manufacturing cost increased.

DISCLOSURE

Technical Problem

One object of the present invention is to provide a height-adjustable golf tee which may adjust a height only using a simple manipulation due to a simple structure, and may maintain the height in an adjusted state even when an impact of a tee shot is transmitted.

Technical Solution

A height-adjustable golf tee according to one aspect of the present invention includes: a fixing member having a predetermined length in a vertical direction and inserted into a ground so that a position thereof is fixed; a main body member slidably connected to the fixing member so as to protrude from the fixing member in a longitudinal direction of the fixing member or to be retracted into the fixing member; and a height maintenance member provided at an end portion of the main body member, formed of an elastic material, and configured to maintain an adjusted height of the main body member in a state where a height of the main body member with respect to the fixing member is adjusted by varying the height of the main body member connected to the fixing member, in which in a state where the main body member is connected to the fixing member, the height of the main body member with respect to the fixing member is varied by an external force to adjust the height of the main body member to a required height, and when the external force is removed in a state where the height of the main body member is adjusted, the adjusted height of the main body member is maintained by the height maintenance member.

Advantageous Effects

According to the height-adjustable golf tee according to one aspect of the present invention, the height-adjustable golf tee includes the fixing member, the main body member, and the height maintenance member, and accordingly, the height of the main body member may be adjusted only using a simple manipulation of varying the height of the main body member with respect to the fixing member by transferring an external force, and even when the impact of the tee shot is transmitted to the main body member, as well as when the external force is removed, the impact may be buffered by the height maintenance member, thereby maintaining the height of the main body member in an adjusted state.

DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view showing a state of a height-adjustable golf tee according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the height-adjustable golf tee according to the first embodiment of the present invention is separated.

FIG. 3 is a sectional view of the height-adjustable golf tee according to the first embodiment of the present invention, which is vertically cut.

FIG. 4 is an enlarged view of part A of FIG. 3.

FIG. 5 is a plan view of a fixing member constituting a height-adjustable golf tee according to a second embodiment of the present invention, when viewed from above.

FIG. 6 is a sectional view of a height-adjustable golf tee according to a third embodiment of the present invention, which is vertically cut.

FIG. 7 is an enlarged view of part B of FIG. 6.

FIG. 8 is an enlarged view showing a state of an expansion and pressurization member.

BEST MODE

Hereinafter, a height-adjustable golf tee according to embodiments of the present invention will be described with reference to accompanying drawings.

FIG. 1 is a perspective view showing a state of a height-adjustable golf tee according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a state where the height-adjustable golf tee according to the first embodiment of the present invention is separated, FIG. 3 is a sectional view of the height-adjustable golf tee according to the first embodiment of the present invention, which is vertically cut, and FIG. 4 is an enlarged view of part A of FIG. 3.

Referring to FIGS. 1 to 4, a height-adjustable golf tee 100 according to the present embodiment includes a fixing member 110, a main body member 120, and a height maintenance member 125.

The fixing member 110 has a predetermined length in a vertical direction, is inserted into the ground so that a position thereof is fixed, is formed of a metal material or a synthetic resin material, and includes a fixing body 111, a ground seating portion 112, and a connection hole 113.

The fixing body 111 is formed in a cylindrical shape and has a predetermined length in the vertical direction with a lower portion formed in a shape that is gradually sharpened outward such that the fixing body 111 is easily inserted into the ground.

The ground seating portion 112 is provided at an upper end of the fixing body 111 and extends laterally outward of the fixing body 111.

In detail, the ground seating portion 112 is formed in a disc shape having a diameter that is relatively larger than a diameter of the fixing body 111, and when the fixing body 111 is inserted into the ground, the ground seating portion 112 is seated on the ground to limit an insertion depth of the fixing body 111 and to stably maintain an inserted state of the fixing body 111 inserted into the ground.

The connection hole 113 is recessed inward from a central portion of the upper surface of the fixing body 111 by a predetermined depth, and is a space into which at least a part of the main body member 120 is inserted.

Reference numeral 114 is a catching protrusion protruding from an inner circumferential surface of the connection hole 113 toward a central portion to prevent the main body member 120 and the height maintenance member 125 from being arbitrarily separated from the fixing member 110 after the main body member 120 and the height maintenance member 125 are inserted into the connection hole 113.

The catching protrusion 114 has a diameter that is relatively smaller than a diameter of the height maintenance member 125. In that case, the main body member 120 may be slid such that the height thereof is varied in the connection hole 113, whereas when the main body member 120 protrudes from the fixing member 110 by a predetermined length, the main body member 120 is caught on the catching protrusion 114, thereby preventing the height maintenance member 125 and the main body member 120, which is coupled to the height maintenance member 125, from being arbitrarily separated in the connection hole 113.

The main body member 120 is slidably connected to the fixing member 110 to protrude from the fixing member 110 in a longitudinal direction of the fixing member 110 or to be retracted into the fixing member 110, and includes a main body 121, a golf ball seating portion 122, and a main body-side central hole 123.

The main body 121 has a predetermined length in the vertical direction, and is slidably inserted into the connection hole 113.

That is, when the main body 121 is slid in the connection hole 113 to protrude to the outside of the connection hole 113, the height of the main body member 120 with respect to the fixing member 110 is relatively increased, so that the overall height of the height-adjustable golf tee 100 is relatively increased.

In contrast, when the main body member 120 is slid in the connection hole 113 to be retracted into the connection hole 113, the height of the main body member 120 with respect to the fixing member 110 is relatively reduced, so that the overall height of the height-adjustable golf tee 100 is relatively reduced.

The ground seating portion 122 is provided at an upper end of the main body 121 and extends laterally outward of the main body 121 so that a golf ball is seated thereon.

A central portion of the golf ball seating portion 122 is formed at a position relatively lower than an edge part of the golf ball seating portion 122 so that the golf ball is safely seated on the golf ball seating portion 122.

The main body-side central hole 123 is formed through the central portion of the main body 121 in a longitudinal direction of the main body 121.

The main body-side central hole 123 communicates with the connection hole 113.

Meanwhile, the fixing member 110 is formed with a reflection portion 130 which connects an upper surface of the ground seating portion 112 and the inner circumferential surface of the connection hole 113 to each other, and is inclined in the form that gradually converges from the upper surface of the ground seating portion 112 toward an inside of the connection hole 113.

The reflection portion 130 reflects a shape, a picture, a figure, or the like disposed in front thereof, and may be presented as an example of a metal plate having a smooth surface or a mirror formed of a glass material.

The main body 121 constituting the main body member 120 is formed with a height checking indicator 131 that enables checking of a height.

A plurality of height checking indicators 131 are spaced apart from each other at mutually different heights in a vertical direction, which is the longitudinal direction of the main body 121, and a scale or number capable of checking the mutually different heights may be presented by way of example.

As the height checking indicator is formed as described above, the adjusted height of the main body member 120 with respect to the fixing member 110 may be checked through an image of the height checking indicator 131 reflected by the reflection portion 130.

According to the present embodiment, the height checking indicator 131 is formed in a number, and is formed in a reverse direction in which the top and bottom thereof are reversed as shown in FIG. 2.

In that case, the image of the height checking indicator 131 reflected by the reflection portion 130 is viewed in the forward direction, so that a golfer may easily check the adjusted height of the main body member 120 through the image of the height checking indicator 131 reflected by the reflection portion 130 on the height-adjustable golf tee 100 while putting the height-adjustable golf tee 100 in the ground without checking the height checking indicator 131 in the lateral direction in order to check the height of the height-adjustable golf tee 100.

The height maintenance member 125 is formed at an end portion of the main body member 120, is formed of an elastic material such as rubber, is configured to maintain the adjusted height of the main body member 120 in a state where the height of the main body member 120 with respect to the fixing member 110 is adjusted by varying the height of the main body member 120 connected to the fixing member 110, and includes a height maintenance body 126, an elastic protrusion body 127, and a height maintenance-side central hole 128.

The height maintenance body 126 is formed in a cylindrical shape and is coupled to an opposite end portion of the main body 121, which is in a direction opposite to the golf ball seating portion 122 formed at one end portion of the main body 121.

The elastic protrusion body 127 protrudes laterally outward from an outer circumferential surface of the height maintenance body 126, and makes contact with an inner surface of the connection hole 113 while being elastically deformed when the main body 121 is inserted into the connection hole 113.

The height maintenance-side central hole 128 is formed through the central portion of the height maintenance body 121 in the longitudinal direction of the main body 121.

The height maintenance-side central hole 128 communicates with the main body-side central hole 123 and the connection hole 113.

The main body-side central hole 123 and the connection hole 113 serve as an air flow path through which air in an inner space of the connection hole 113 is discharged to the outside when the main body member 120 is slid with respect to the fixing member 110.

In addition, since the height maintenance member 125 is coupled to a lower end of the main body member 120 and is formed of an elastic material, an impact of golf swing transmitted to the main body member 120 during a tee shot is absorbed while the height maintenance member 125 is elastically deformed, and accordingly, an impact of the tee shot transmitted to the main body member 120 may be alleviated by the height maintenance member 125.

When the height-adjustable golf tee 100 is configured as described above, the height of the main body member 120 with respect to the fixing member 110 is varied by an external force in a state where the main body member 120 is connected to the fixing member 110 so that the height of the main body member 120 is adjusted to a required height, and when the external force is removed in a state where the height of the main body member 120 is adjusted, the adjusted height of the main body member 120 may be maintained by the height maintenance member 125.

In detail, the main body member 120 is slid by the external force after being inserted into the fixing member 110, and the air in the connection hole 113, which is an inner space of the fixing member 110, is discharged to the outside through the height maintenance-side central hole 128 and the main body-side central hole 123, so that the height of the main body member 120 with respect to the fixing member 110 may be varied, and in a state where the height of the main body member 120 with respect to the fixing member 110 is varied, the height of the main body member 120 with respect to the fixing member 110 may be maintained in an adjusted state by a frictional force between the inner surface of the connection hole 113 and the elastic protrusion body 127.

In more detail, since the elastic protrusion body 127 makes contact with the inner surface of the connection hole 113 while being elastically deformed, the frictional force is generated between the elastic protrusion body 127 and the inner surface of the connection hole 113, and the position of the main body member 120 with respect to the fixing member 110 may be fixed by the frictional force in a state where the height of the main body member 120 is varied.

In this state, when an external force that is relatively smaller than the frictional force generated between the elastic protrusion body 127 and the inner surface of the connection hole 113 is transmitted to the main body member 120, the main body member 120 maintains the position with respect to the fixing member 110, and when an external force that is relatively larger than the frictional force generated between the elastic protrusion body 127 and the inner surface of the connection hole 113 is transmitted to the main body member 120, the main body member 120 protrudes from the fixing member 110 or is retracted into the fixing member 110 so that the height with respect to the fixing member 110 is varied, and when the external force is removed in a state where the height of the main body member 120 is varied, the main body member 120 is maintained in a state in which the height thereof is adjusted by the frictional force between the elastic protrusion body 127 and the inner surface of the connection hole 113.

Hereinafter, an operation of the height-adjustable golf tee 100 according to the present embodiment of the present invention will be described with reference to accompanying drawings.

First, the main body member 120 is connected to the fixing member 110.

Thereafter, the fixing member 110 is inserted into the ground.

In this case, the fixing member 110 is preferably inserted by a depth at which the ground seating portion 112 is seated on the ground.

Thereafter, the external force is transmitted to the main body member 120 to vary the height of the main body member 120 with respect to the fixing member 110.

The height of the main body member 120 is varied while being slid in the longitudinal direction of the fixing member 110, that is, in the vertical direction, and the adjustment of the height of the main body member 120 to a required height with respect to the fixing member 110 may be checked through the image of the height checking indicator 131 reflected by the reflection portion 130.

As described above, the height-adjustable golf tee 100 includes the fixing member 110, the main body member 120, and the height maintenance member 125, and accordingly, the height of the main body member 120 may be adjusted only using a simple manipulation of varying the height of the main body member 120 with respect to the fixing member 110, and even when the impact of the tee shot is transmitted to the main body member, as well as when the external force is removed, the impact may be buffered by the height maintenance member 125, thereby maintaining the height of the main body member 120 in an adjusted state.

MODE FOR INVENTION

Hereinafter, a height-adjustable golf tee according to other embodiments of the present invention will be described with reference to accompanying drawings.

In performing this description, a description overlapping with the contents already described in the first embodiment of the present invention will be replaced, and the description will be omitted herein.

FIG. 5 is a plan view of a fixing member constituting a height-adjustable golf tee according to a second embodiment of the present invention, when viewed from above.

Referring to FIG. 5, the height-adjustable golf tee according to the present embodiment includes a fixing member 210, a main body member, and a height maintenance member.

The fixing member 210 has a predetermined length in a vertical direction and is inserted into the ground so that a position thereof is fixed, and includes a fixing body, a ground seating portion 212, a connection hole 213, and a direction guide protrusion 215.

The fixing body has a predetermined length with a lower portion formed in a shape that is gradually sharpened outward.

The ground seating portion 212 is provided at an upper end of the fixing body and extends laterally outward of the fixing body.

The connection hole 213 is recessed inward from a central portion of the upper end of the fixing body by a predetermined depth.

The direction guide protrusion 215 protrudes from the ground seating portion 212 by a predetermined length to guide a trajectory direction of the golf ball.

The trajectory direction is checked to allow the golf ball to fly in a required direction, and when the golfer stands toward a direction where the ball flies to check the direction, and then takes an address posture to hit a tee shot, distortion of the trajectory direction may occur.

When the direction guide protrusion 215 is formed, the golfer may perform the tee shot after adjusting the direction in advance such that the direction guide protrusion 215 is directed toward the trajectory direction when the fixing member 210 is inserted into the ground, and accordingly, the trajectory direction of the golf ball may be accurately recognized even when the golfer takes the address posture.

Only one direction guide protrusion 215 may protrude from the ground seating portion 212, or two direction guide protrusions 215 may protrude in a symmetrical form with respect to the center of the connection hole 213 as in the present embodiment, or a plurality of direction guide protrusions 215 may be spaced apart from each other at equal intervals.

FIG. 6 is a sectional view of a height-adjustable golf tee according to a third embodiment of the present invention, which is vertically cut. FIG. 7 is an enlarged view of part B of FIG. 6, and FIG. 8 is an enlarged view showing a state of an expansion and pressurization member.

Referring to FIGS. 6 to 8 together, the height-adjustable golf tee according to the present embodiment includes a fixing member 310, a main body member, a height maintenance member 325, and an expansion and pressurization member 340.

The height maintenance member 325 includes a height maintenance body 326, an elastic protrusion body 327, and a height maintenance-side central hole 328.

The height maintenance body 326 is coupled to a main body 321 from an opposite end portion of the main body 321, which is in a direction opposite to the golf ball seating portion formed at one end portion of the main body 321.

The elastic protrusion body 327 protrudes laterally outward from an outer circumferential surface of the height maintenance body 326, and makes contact with an inner surface of a connection hole 313 when the main body 321 is inserted into the connection hole 313.

The height maintenance-side central hole 328 is formed through the central portion of the height maintenance body 326 in a longitudinal direction of the main body 321.

The expansion and pressurization member 340 pressurizes an inner circumferential surface of the connection hole 313 while being expanded due to an external force applied to an upper end of the main body member, and includes an air accommodation body 341, an air flow tube 342, an expansion body 343, and an expansion body accommodation groove 344.

The air accommodation body 341 is disposed at an upper end of the golf ball seating portion, is formed therein with a space for accommodating air, and has an open lower portion.

The air accommodation body 341 is formed of an elastic material such as rubber to be elastically deformable.

The air accommodation body 341 is detachably connected to the golf ball seating portion, and is fixed to an upper portion of the golf ball seating portion in the form in which a part of the lower portion of the air accommodation body 341 is inserted into the main body-side central hole 323 in a state where the height of the main body member with respect to the fixing member 310 is adjusted.

The air flow tube 342 is formed in a cylindrical shape with open both ends, is inserted into the height maintenance body 326, and has an inside communicating with the height maintenance-side central hole 328.

The expansion body 343 is coupled to an end of the air flow tube 342, which is relatively close to an outer side of the height maintenance body 326, and is formed of an elastic material.

The expansion body accommodation groove 344 is recessed by a predetermined depth from the outer side of the height maintenance body 326 such that the expansion body 343 is accommodated therein.

When the main body member connected to the fixing member 310 is slid so that the height thereof is varied and adjusted to a required height with respect to the fixing member 310, and the air accommodation body 341 is connected to the upper end of the golf ball seating portion, the height maintenance member 325 makes close contact with the inner circumferential surface of the connection hole 313 so that the main body-side central hole 323, the height maintenance-side central hole 328, and an inner space of the connection hole 313, which communicate with each other, are sealed, thereby primarily maintaining the height of the main member body with respect to the fixing member 310.

In addition, when the height of the main body member with respect to the fixing member 310 is adjusted, and the air accommodation body 341 is pressed by the external force in a state where the air accommodation body 341 is connected, the air inside the air accommodation body 341 is introduced into the expansion body 343 through the main body-side central hole 323, the height maintenance-side central hole 328, and the air flow tube 342, and the expansion body 343 is expanded from the expansion body accommodation groove 344 by the air introduced into the expansion body 343 to pressurize the inner circumferential surface of the connection hole 313, so that a frictional force is generated between the expansion body 343 and the inner circumferential surface of the connection hole 313, thereby secondarily maintaining the adjusted height of the main body member with respect to the fixing member 310 by the frictional force generated between the expansion body 343 and the inner circumferential surface of the connection hole 313.

At least one expansion and pressurization member 340 may be formed along an outer circumferential surface of the height maintenance body 326, but preferably, a plurality of expansion and pressurization members 340 are spaced apart from each other at a predetermined angle and make close contact at a plurality of points on the inner circumferential surface of the connection hole 313.

Although the present invention has been shown and described with respect to specific embodiments, it will be understood by those skilled in the art that the present invention may be variously modified and changed without departing from the spirit and scope of the present invention described in the following claims. However, it is intended to clearly clarify that all of these modifications and variations are included within the scope of the present invention.

INDUSTRIAL APPLICABILITY

According to the height-adjustable golf tee according to one aspect of the present invention, the height of the main body member may be adjusted only using a simple manipulation, and the adjusted height may be maintained even when the external force is removed and the impact from the tee shot is transmitted, thereby achieving improved industrial applicability.

Claims

1. A height-adjustable golf tee comprising:

a fixing member having a predetermined length in a vertical direction and inserted into a ground so that a position thereof is fixed;

a main body member slidably connected to the fixing member so as to protrude from the fixing member in a longitudinal direction of the fixing member or to be retracted into the fixing member; and

a height maintenance member provided at an end portion of the main body member, formed of an elastic material, and configured to maintain an adjusted height of the main body member in a state where a height of the main body member with respect to the fixing member is adjusted by varying the height of the main body member connected to the fixing member,

wherein in a state where the main body member is connected to the fixing member, the height of the main body member with respect to the fixing member is varied by an external force to adjust the height of the main body member to a required height, and when the external force is removed in a state where the height of the main body member is adjusted, the adjusted height of the main body member is maintained by the height maintenance member.

2. The height-adjustable golf tee of claim 1, wherein the fixing member includes:

a fixing body having a predetermined length with a lower portion formed in a shape that is gradually sharpened outward;

a ground seating portion provided at an upper end of the fixing body and extending laterally outward of the fixing member; and

a connection hole recessed inward from a central portion of an upper surface of the fixing body by a predetermined depth,

wherein the main body member includes:

a main body having a predetermined length and inserted into the connection hole;

a golf ball seating portion provided at an upper end of the main body and extending laterally outward of the main body so that a golf ball is seated thereon; and

a main body-side central hole formed through a central portion of the main body in a longitudinal direction of the main body,

wherein the height maintenance member includes:

a height maintenance body coupled to an opposite end portion of the main body, which is in a direction opposite to the golf ball seating portion formed at one end portion of the main body;

an elastic protrusion body protruding laterally outward from an outer circumferential surface of the height maintenance body, and making contact with an inner surface of the connection hole when the main body is inserted into the connection hole; and

a height maintenance-side central hole formed through a central portion of the height maintenance body in the longitudinal direction of the main body, and

wherein the main body is slid by an external force after being inserted into the fixing member, the height of the main body member with respect to the fixing member is varied as air, which is present in the connection hole serving as an internal space of the fixing member, is discharged to an outside through the height maintenance-side central hole and the main body-side central hole, and in a state where the height of the main body member with respect to the fixing member is varied, a position of the main body member with respect to the fixing member is maintained due to a frictional force between the inner surface of the connection hole and the elastic protrusion body.

3. The height-adjustable golf tee of claim 2, wherein the fixing member is formed with a reflection portion which connects an upper surface of the ground seating portion and an inner circumferential surface of the connection hole to each other, and is inclined in a form that gradually converges from the upper surface of the ground seating portion toward an inside of the connection hole,

wherein the main body constituting the main body member is formed with a height checking indicator that enables checking of a height, and

wherein the adjusted height of the main body member with respect to the fixing member is checked through an image of the height checking indicator reflected on the reflection portion.

4. The height-adjustable golf tee of claim 2, wherein the fixing member includes a direction guide protrusion protruding from the ground seating portion by a predetermined length to guide a trajectory direction of the golf ball.

5. The height-adjustable golf tee of claim 3, further comprising an expansion and pressurization member configured to pressurize the inner circumferential surface of the connection hole while being expanded due to an external force applied to an upper end of the main body member,

wherein the expansion and pressurization member includes:

an air accommodation body disposed at an upper end of the golf ball seating portion, formed therein with a space for accommodating air, and having an open lower portion;

an air flow tube inserted into the height maintenance body and having an inside communicating with the height maintenance-side central hole;

an expansion body coupled to an end of the air flow tube, which is relatively close to an outer side of the height maintenance body, and formed of an elastic material; and

an expansion body accommodation groove recessed by a predetermined depth from the outer side of the height maintenance body such that the expansion body is accommodated therein,

wherein when the main body member connected to the fixing member is slid so that the height thereof is varied to adjust the height to a required height with respect to the fixing member, and the air accommodation body is connected to the upper end of the golf ball seating portion, the height maintenance member makes close contact with the inner circumferential surface of the connection hole so that the main body-side central hole, the height maintenance-side central hole, and an inner space of the connection hole, which communicate with each other, are sealed, thereby primarily maintaining the adjusted height of the main member body with respect to the fixing member, and

wherein when the height of the main body member with respect to the fixing member is adjusted, and the air accommodation body is pressed by the external force in a state where the air accommodation body is connected, the air inside the air accommodation body is introduced into the expansion body through the main body-side central hole, the height maintenance-side central hole, and the air flow tube, and the expansion body is expanded from the expansion body accommodation groove by the air introduced into the expansion body to pressurize the inner circumferential surface of the connection hole, so that a frictional force is generated between the expansion body and the inner circumferential surface of the connection hole, thereby secondarily maintaining the adjusted height of the main body member with respect to the fixing member by the frictional force generated between the expansion body and the inner circumferential surface of the connection hole.