Tape reel and method for manufacturing the same

Abstract

A tape reel according to the present invention includes: a disk-shape first flange having an opening in its central portion; a disk-shape second age having an opening in its central portion; and a cylindrical hub that includes, on an outer periphery thereof, a first pedestal for receiving the first flange and a second pedestal for receiving the second flange. The first flange and the second flange are joined to the first and second pedestals of the hub, respectively, and extend in a radial direction from the outer periphery of the hub. When viewed along a direction of a rotation axis of the reel, an outer periphery of the first pedestal and an outer periphery of the second pedestal are on circumferences of different concentric circles, and an upper surface of the first pedestal and an upper surface of the second pedestal face the same direction.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a tape reel that achieves high accuracy and a method for manufacturing the same.

2. Description of Related Art

In recent years, means for high-speed information transmission such as optical fibers have made remarkable progress. As a result, it became possible to transmit images and data with an enormous amount of information, while at the same time, there arises an increasing demand for advanced techniques to record, reproduce, and store such images and data. Examples of recording and reproducing media include flexible disks, magnetic drums, hard disks, and magnetic tapes. Tape-shaped recording media such as magnetic tapes play a major role mainly as data backup media, because their recording capacity per reel is large. Examples of the tape-shaped recording media include magnetic tapes and optical tapes.

Usually, the tape-shaped recording medium is used in the state where it is wound around a reel and housed in a cartridge. Lately, with an increase in recording capacity of a tape cartridge, further improvement in shape accuracy and rotational accuracy of a reel of the tape cartridge has been demanded.

The reel falls into two types, namely, a two-piece type and a three-piece type (see JP 10(1998)-320958 A and JP 2002-298542 A, for instance). As shown in FIG. 9, a two-piece type reel 100 includes: a hub 102 (a magnetic tape, for example, can be wound around an outer peripheral surface 101 of this hub 102); a disk-shape first flange 103 that has an opening in its center and is fixed to the hub 102 by welding; and a disk-shaped second age 104 that is formed integrally with the hub 102. The first flange 103 can be joined to the hub 102 by ultrasonic welding, caulking, or the like. Furthermore, as shown in FIG. 10, when the reel 100 is in use, a magnetic tape 105 is wound around the outer peripheral surface 101 of the hub 102. As shown in FIGS. 11A and 11B, the hub 102 as a component of the two-piece type reel is formed integrally with the second flange 104, and the second flange 104 is formed so as to extend in the radial direction from an outer periphery of the hub 102.

On the other hand, a three-piece type reel corresponds to, for example, the above-described two-piece type reel 100 in which the hub 102 and the second flange 104 are provided as separate components. In the three-piece type reel, the first age, the hub, and the second flange are joined to each other by ultrasonic welding, snap-fitting, or the like.

In both the two-piece type reel and the three-piece type reel, the components thereof generally are manufactured by injection molding of a resin. In the two-piece type reel, the first flange and the hub provided with the second flange are manufactured separately by injection molding. At this time, since the first flange has a flat disk shape, the resin flows smoothly during the injection molding, so that it is possible to manufacture the first flange with high shape accuracy. In contrast, in the hub provided with the second flange, the flange bends with respect to the tape-winding surface of the hub and the thickness of the tape-winding surface of the hub is different from that of the flange. Thus, when the resin flows during the injection molding, an internal pressure in the mold is liable to be nonuniform, which makes it difficult to form the hub and the second flange integrally with high shape accuracy. Accordingly, the shape accuracy of the reel obtained by joining these components also is deteriorated.

On the other hand, in the three-piece type reel, the first flange, the hub, and the second flange are manufactured separately by injection molding. The components of the three-piece type reel can be manufactured with higher shape accuracy as compared with the components of the two-piece type reel, because the components of the three-piece type reel do not have a large bent portion and have a substantially uniform thickness. However, in order to manufacture the three-piece type reel, the flanges need to be joined to both sides of the hub, respectively. Thus, it is usually necessary to perform, after one of the flanges has been joined to the hub, the step of turning over the hub to join the other flange, for example, thereby making the manufacturing process complicated. Also, a method of joining the flanges to both the sides of the hub, respectively, by snap-fitting has been proposed. However, when the flanges are joined by snap-fitting, each fitting portion needs to have a clearance due to its construction, which poses a problem in that the components cannot be fixed together sufficiently after being joined, resulting in deteriorated shape accuracy of the reel as a whole.

When the shape accuracy of the reel is not sufficient as described above, the rotational accuracy of the reel also is deteriorated to make the tape run unstable. This deteriorates the reading accuracy and recording accuracy of recording signals by the drive head, thereby causing errors in reading and recording the recording signals.

SUMMARY OF THE INVENTION

The present invention is intended to solve the above-described problems and to provide a tape reel that is of a three-piece type with each component having high shape accuracy and is improved in shape accuracy of the reel as a whole and a method for manufacturing such a tape reel efficiently.

A tape reel according to the present invention includes: a disk-shape first flange having an opening in its central portion; a disk-shape second flange having an opening in its central portion; and a cylindrical hub that comprises, on an outer periphery thereof, a first pedestal for receiving the first flange and a second pedestal for receiving the second flange. The first flange and the second flange are joined to the first and second pedestals of the hub, respectively, and extend in a radial direction from the outer periphery of the hub. When viewed along a direction of a rotation axis of the reel, an outer periphery of the first pedestal and an outer periphery of the second pedestal are on circumferences of different concentric circles, and an upper surface of the first pedestal and an upper surface of the second pedestal face the same direction.

A method for manufacturing a tape reel according to the present invention is a method for manufacturing a tape reel that includes: a disk-shape first flange having an opening in its central portion; a disk-shape second flange having an opening in its central portion; and a cylindrical hub that comprises, on an outer periphery thereof, a first pedestal for receiving the first flange and a second pedestal for receiving the second flange, wherein the first flange and the second flange are joined to the first and second pedestals of the hub, respectively, and extend in a radial direction from the outer periphery of the hub, when viewed along a direction of a rotation axis of the reel, an outer periphery of the first pedestal and an outer periphery of the second pedestal are on circumferences of different concentric circles, and an upper surface of the first pedestal and an upper surface of the second pedestal face the same direction. The method includes the steps of: joining the first flange to the first pedestal; and joining the second flange to the second pedestal.

Since the tape reel according to the present invention can achieve high shape accuracy, the rotational accuracy of the reel also is improved, which allows the running stability of the tape to be improved.

Moreover, by the method for manufacturing a tape reel according to the present invention, the above-described tape reel of the present invention can be manufactured efficiently with simple facilities.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a plan view showing an example of a first flange used in a tape reel according to the present invention, FIG. 1B is a sectional view taken along a line I-I in FIG. 1A, and FIG. 1C is an enlarged view of a portion 1C in FIG. 1B.

FIG. 2A is a plan view showing an example of a second flange used in a tape reel according to the present invention, FIG. 2B is a sectional view taken along a line II-II in FIG. 2A, and FIG. 2C is an enlarged view of a portion 2C in FIG. 2B.

FIG. 3A is a plan view showing an example of a hub used in a tape reel according to the present invention, FIG. 3B is a side view of the same, FIG. 3C is a sectional view taken along a line III-III in FIG. 3A, and FIGS. 3D and 3E are enlarged views of portions 3D and 3E in FIG. 3C, respectively.

FIG. 4A is a sectional view showing an example of a tape reel according to the present invention, and FIGS. 4B and 4C are enlarged views of portions 4B and 4C in FIG. 4A, respectively.

FIG. 5A is a sectional view illustrating an example of the step of joining the hub and the second flange, and FIG. 5B is an enlarged view of a portion 5B in FIG. 5A.

FIG. 6A is a sectional view illustrating an example of the step of joining the hub and the first flange, and FIG. 6B is an enlarged view of a portion 6B in FIG. 6A.

FIG. 7A is a sectional view showing another example of a tape reel according to the present invention, and FIGS. 7B and 7C are enlarged views of portions 7B and 7C in FIG. 7A, respectively.

FIG. 8A is a sectional view showing still another example of a tape reel according to the present invention, and FIGS. 8B and 8C are enlarged views of portions 8B and 8C in FIG. 8A, respectively.

FIG. 9 is a sectional view showing a conventional tape reel for a magnetic tape.

FIG. 10 is a sectional view showing the state where a tape is wound around the tape reel shown in FIG. 9.

FIG. 11A is a plan view showing a hub used in the conventional tape reel for a magnetic tape, and FIG. 11B is a side view of the same.

DETAILED DESCRIPTION OF THE INVENTION

The tape reel according to the present invention is a three-piece type tape reel including: a disk-shape first flange having an opening in its central portion: a cylindrical hub; and a disk-shape second flange having an opening in its central portion. The first flange and the second flange are joined to both sides of the hub, respectively, and extend in a radial direction from an outer periphery of the hub. By configuring the tape reel so as to be a three-piece type tape reel, the shape accuracies of the respective components can be improved.

Furthermore, the hub include, on its outer periphery, a first pedestal for receiving the first flange and a second pedestal for receiving the second flange. When viewed along a direction of a rotation axis of the reel, an outer periphery of the first pedestal and an outer periphery of the second pedestal are on circumferences of different concentric circles, and an upper surface of the first pedestal and an upper surface of the second pedestal face the same direction. With this configuration, it becomes possible to join the first flange and the second flange to the hub from the same direction (the uniaxial direction), which allows an apparatus used for joining the hub and the flanges to be simplified.

Still further, the first flange is joined to the first pedestal, and the second flange is joined to the second pedestal. With this configuration, the flanges can be joined to the hub by ultrasonic welding, caulking, adhesion with the use of an adhering member, or the like, which allows a plurality of components to be fixed and joined with high accuracy. Accordingly the shape accuracy of the reel as a whole after the respective components have been joined also can be improved. It should be noted that means for joining the hub and the flanges is not limited to those described above, and any other means can be used as long as a plurality of components can be fixed and joined with high shape accuracy.

The tape reel according to the present invention is applicable not only to a single-reel type tape cartridge but also to a double-reel type tape cartridge. Moreover, the tape reel according to the present invention can be used not only as a reel of a tape cartridge but also as a reel of a drive.

On the other hand, the method for manufacturing a tape reel according to the present invention is a method for manufacturing the above-described tape reel of the present invention. The method includes the steps of joining the first flange to the first pedestal; and joining the second flange to the second pedestal. According to this method, it becomes possible to join the first flange and the second flange to the hub from the same direction (the uniaxial direction) as described above, thereby allowing a reel having high shape accuracy to be manufactured efficiently. There is no particular limitation on the method of joining the hub and the flanges. However, methods of joining them by ultrasonic welding, caulking, adhesion with the use of an adhering member, or the like can fix and join a plurality of components with high accuracy and also can improve the shape accuracy of the reel as a whole after the respective components have been joined.

Hereinafter, the present invention will be described by way of illustrative embodiments with reference to the drawings.

Embodiment 1

FIG. 1A is a plan view showing an example of a first flange used in a tape reel according to the present invention, and FIG. 1B is a sectional view taken along a line I-I in FIG. 1A. As shown in FIGS. 1A and 1B, a first flange 10 is formed in a disk shape with an opening 11 in its central portion. FIG. 1C is an enlarged view of a portion 1C in FIG. 1B. As shown in FIG. 1C, the first flange 10 has a joining rib 12 provided on its inner periphery. On the tip end of the joining rib 12, a welding projection 13 is provided. Furthermore, the first flange 10 has a rib 14 provided on its inner periphery on the side opposite to the joining rib 12. As the material of the first flange 10, resins can be used. In this case, since the first flange 10 has a substantially flat disk shape, the resin can be caused to flow with a uniform internal pressure at the time of injection molding, so that the shape of the first flange 10 can be formed with high accuracy. It is to be noted that the material of the first flange 10 is not limited to resins as long as the first flange 10 can be joined to other components.

FIG. 2A is a plan view showing an example of a second flange used in a tape reel according to the present invention, and FIG. 2B is a sectional view taken along a line II-II in FIG. 2A. As shown in FIGS. 2A and 2B, a second flange 20 is formed in a disk shape with an opening 21 in its central portion. FIG. 2C is an enlarged view of a portion 2C in FIG. 2B. As shown in FIG. 2C, the second flange 20 has a joining rib 22 provided on its inner periphery. On the tip end of the joining rib 22, a welding projection 23 is provided. As the material of the second flange 20, resins can be used In this case, since the second flange 20 has a substantially flat disk shape, the resin can be caused to flow with a uniform internal pressure at the time of injection molding so that the shape of the second flange 20 can be formed with high accuracy. It is to be noted that the material of the second flange 20 is not limited to resins as long as the second flange 20 can be joined to other components.

FIG. 3A is a plan view showing an example of a hub used in a tape reel according to the present invention, FIG. 3B is a side view of the same, and FIG. 3C is a sectional view taken along a line III-III in FIG. 3A. As shown in FIGS. 3A to 3C, a hub 30 is formed in a bottomed cylindrical shape. The hub 30 includes, on its outer periphery, a first pedestal 31 for receiving the above-described first flange 10 (FIG. 1A) and a second pedestal 32 for receiving the above-described second flange 20 (FIG. 2A). When viewed along the direction of a rotation axis 33 of the reel, an outer periphery 31a of the first pedestal 31 and an outer periphery 32a of the second pedestal 32 are on circumferences of different concentric circles, and an outer diameter of the first pedestal 31 is set to be smaller than that of the second pedestal 32. Furthermore, an upper surface 31b of the first pedestal 31 and an upper surface 32b of the second pedestal 32 both face the same direction (they face upward in FIG. 3B). FIGS. 3D and 3E are enlarged views of portions 3D and 3E in FIG. 3C, respectively. As shown in FIG. 3D, the first pedestal 31 has a joining groove 34, and as shown in FIG. 3E, the second pedestal 32 has a joining groove 35. As the material of the hub 30, resins can be used. In this case, since the hub 30 has no flange portion, the resin can be caused to flow with a uniform internal pressure at the time of injection molding, in contrast to the case of a conventional hub provided with flanges. Thus, the shape of the hub 30 can be formed with high accuracy. It is to be noted that the material of the hub 30 is not limited to resins as long as the hub 30 can be joined to other components.

FIG. 4A is a sectional view showing an example of a tape reel according to the present invention. As shown in FIG. 4A, a reel 40 is formed by joining the first flange 10, the second flange 20, and the hub 30, which have been described with reference to FIGS. 1A to 3E above. FIGS. 4B and 4C are enlarged views of portions 4B and 4C in FIG. 4A, respectively. As shown in FIG. 4B, the joining rib 12 of the first flange 10 is joined to the joining groove 34 of the first pedestal 31 by ultrasonic welding that will be described later, and as shown in FIG. 4C, the joining rib 22 of the second flange 20 is joined to the joining groove 35 of the second pedestal 32 by ultrasonic welding that will be described later.

Next, a method for manufacturing the tape reel according to the present embodiment will be described. FIG. 5A is a sectional view illustrating an example of the step of joining the hub and the second flange, and FIG. 5B is an enlarged view of a portion 5B in FIG. 5A. FIG. 6A is a sectional view illustrating an example of the step of joining the hub and the first flange, and FIG. 6B is an enlarged view of a portion 6B in FIG. 6A. Note here that, in FIGS. 5 and 6, components other than the hub and the flanges are not shown in cross section.

First, as shown in FIGS. 5A and 5B, the hub 30 is fixed to a receiving jig 50 that is formed in a protruding shape. Thereafter, the second flange 20 is placed on the second pedestal 32 from above, and the joining rib 22 of the second flange 20 is inserted into the joining groove 35 of the second pedestal 32. Then, a first welding horn 51 is placed on the side opposite to the joining rib 22 of the second flange 20 such that a portion to be joined is sandwiched between the first welding horn 51 and the receiving jig 50. Finally, the first welding horn 51 applies an ultrasonic wave to the portion to be joined to melt the welding projection 23 of the joining rib 22, thereby welding the joining rib 22 to the joining groove 35. By this first step, the second flange 20 can be joined and fixed to the hub 30 with high shape accuracy.

Next, as shown in FIGS. 6A and 6B, the first flange 10 is placed on the first pedestal 31 from above, and the joining rib 12 of the first flange 10 is inserted into the joining groove 34 of the first pedestal 31. Then, a second welding horn 52 is placed on the rib 14 of the first flange 10 such that a portion to be joined is sandwiched between the second welding horn 52 and the receiving jig 50. Finally, the second welding horn 52 applies an ultrasonic wave to the portion to be joined to melt the welding projection 13 of the joining rib 12, thereby welding the joining rib 12 to the joining groove 34. By this second step, the first flange 10 can be joined and fixed to the hub 30 with high shape accuracy.

According to the manufacturing method of the present embodiment, the first flange 10 and the second flange 20 can be placed on the hub 30 from the same direction, so that it is possible to join the first flange 10 and the second flange 20 without turning over the hub 30. Thus, an apparatus used for joining can be simplified and the joining process can be carried out efficiently.

Furthermore, in the first and second steps described above, by sandwiching the portion to be joined between the first and second welding horns 51, 52 and the receiving jig 50, the loss in welding energy can be suppressed and the welding accuracy can be improved. Note here that a common horn may be used as the first welding horn 51 and the second welding horn 52 in the first and second steps.

Embodiment 2

FIG. 7A is a sectional view showing another example of a tape reel according to the present invention. As shown in FIG. 7A, a reel 60 is formed by joining a first flange 15, a second flange 20, and a hub 36. The first flange 15 is formed in a disk shape with an opening in its central portion and has a pass-through slit 16 for caulking on its inner periphery. The second flange 20 has the same configuration as that used in Embodiment 1. Thus, in the following, the same components are given the same reference numerals and the description thereof has been omitted. Furthermore, the hub 36 has the same configuration as the hub 30 used in Embodiment 1 except that a caulking boss 37 is provided instead of the joining groove 34 (FIG. 3D). Thus, in the following, the same components are given the same reference numerals and the description thereof has been omitted.

FIGS. 7B and 7C are enlarged views of portions 7B and 7C in FIG. 7A, respectively. As shown in FIG. 7B, the first flange 15 is joined to a first pedestal 31 of the hub 36 by caulking via the caulking boss 37. As shown in FIG. 7C, a joining rib 22 of the second flange 20 is joined to a joining groove 35 of a second pedestal 32 by ultrasonic welding, as in Embodiment 1. The reason why only the first flange 15 is joined by caulking in the present embodiment is that, even if the first flange 15 is joined by caulking, the caulking boss 37 does not interfere with the tape-winding surface. On the other hand, if the second flange 20 is joined by caulking, a caulking boss sticks out so as to interfere with the tape-winding surface, thus hindering the tape winding.

The tape reel 60 of the present embodiment has substantially the same configuration as the tape reel 40 of Embodiment 1 except that the first flange 15 and the hub 36 are joined by caulking and produces the same effect as the tape reel 40 of Embodiment 1. Moreover, according to a method for manufacturing the tape reel 60 of the present embodiment, the first flange 15 and the second flange 20 can be placed on the hub 36 from the same direction, so that it is possible to join the first flange 15 and the second flange 20 without turning over the hub 36; Thus, an apparatus used for joining can be simplified and the joining process can be carried out efficiently.

Embodiment 3

FIG. 8A is a sectional view showing still another example of a tape reel according to the present invention. As shown in FIG. 8A, a reel 70 is formed by joining a first flange 80, a second flange 25, and a hub 30. The first flange 80 is formed in a disk shape with an opening in its central portion and has a rib 81 on its inner periphery. The second flange 25 has the same configuration as the second flange 20 used in Embodiment 1 except that the joining rib 22 (FIG. 2C) is not provided, and thus the description thereof has been omitted. Furthermore, the hub 30 has the same configuration as that used in Embodiment 1. Thus, in the following, the same components are given the same reference numerals and the description thereof has been omitted.

FIGS. 8B and 8C are enlarged views of portions 8B and 8C in FIG. 8A, respectively. As shown in FIGS. 8B and 8C, each of a joining groove 34 and a joining groove 35 of the hub 30 is filled with an adhesive 82, so that the first flange 80 is joined to a first pedestal 31 of the hub 30 with the adhesive 82 and the second flange 25 is joined to a second pedestal 32 of the hub 30 with the adhesive 82. There is no particular limitation on the adhesive 82, and ultraviolet-curing resins and the like can be used as the adhesive 82.

The tape reel 70 of the present embodiment has substantially the same configuration as the tape reel 40 of Embodiment 1 except that the first flange 80 and the second flange 25 are joined to the hub 30 with the adhesive 82 and produces the same effect as the tape reel 40 of Embodiment 1. Moreover, according to a method for manufacturing the tape reel 70 of the present embodiment, the first flange 80 and the second flange 25 can be placed on the hub 30 from the same direction, so that it is possible to join the first flange 80 and the second flange 25 without turning over the hub 30. Thus, an apparatus used for joining can be simplified and the joining process can be carried out efficiently.

As specifically described above, since the tape reel according to the present invention can achieve high shape accuracy, the rotational accuracy of the reel also is improved, which allows the running stability of the tape to be improved. Consequently, the tape reel according to the present invention can contribute to higher performance of tape cartridges.

Moreover, by the method for manufacturing a tape reel according to the present invention, the above-described tape reel of the present invention can be manufactured efficiently with simple facilities. Thus, the method according to the present invention is extremely valuable from an industrial viewpoint.

The invention may be embodied in other forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed in this application are to be considered in all respects as illustrative and not limiting. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims

1. A tape reel comprising:

a disk-shape first flange having an opening in its central portion;

a disk-shape second flange having an opening in its central portion; and

a cylindrical hub that comprises, on an outer periphery thereof, a first pedestal for receiving the first flange and a second pedestal for receiving the second flange,

wherein the first flange and the second flange are joined to the first and second pedestals of the hub, respectively, and extend in a radial direction from the outer periphery of the hub,

when viewed along a direction of a rotation axis of the reel, an outer periphery of the first pedestal and an outer periphery of the second pedestal are on circumferences of different concentric circles, and an upper surface of the first pedestal and an upper surface of the second pedestal face the same direction.

2. The tape reel according to claim 1, wherein

an outer diameter of the first pedestal is smaller than an outer diameter of the second pedestal,

each of the first flange and the second flange has a joining rib on its inner periphery,

each of the first pedestal and the second pedestal has a joining groove,

the joining rib of the first flange is joined to the joining groove of the first pedestal by ultrasonic welding, and

the joining rib of the second flange is joined to the joining groove of the second pedestal by ultrasonic welding.

3. The tape reel according to claim 2, wherein a welding projection is provided on a tip end of the joining rib of each of the first flange and the second flange.

4. The tape reel according to claim 1, wherein

an outer diameter of the first pedestal is smaller than an outer diameter of the second pedestal,

the first flange is joined to the first pedestal by caulking, and

the second flange is joined to the second pedestal by ultrasonic welding.

5. The tape reel according to claim 1, wherein

an outer diameter of the first pedestal is smaller than an outer diameter of the second pedestal,

the first flange is joined to the first pedestal with an adhering member, and

the second flange is joined to the second pedestal with an adhering member.

6. A method for manufacturing a tape reel, the tape reel comprising:

a disk-shape first flange having an opening in its central portion;

a disk-shape second flange having an opening in its central portion; and

a cylindrical hub that comprises, on an outer periphery thereof, a first pedestal for receiving the first flange and a second pedestal for receiving the second flange,

wherein the first flange and the second flange are joined to the first and second pedestals of the hub, respectively, and extend in a radial direction from the outer periphery of the hub,

when viewed along a direction of a rotation axis of the reel, an outer periphery of the first pedestal and an outer periphery of the second pedestal are on circumferences of different concentric circles, and an upper surface of the first pedestal and an upper surface of the second pedestal face the same direction,

the method comprising the steps of:

joining the first flange to the first pedestal; and

joining the second flange to the second pedestal.

7. The method according to claim 6, wherein

an outer diameter of the first pedestal is smaller than an outer diameter of the second pedestal,

each of the first flange and the second flange has a joining rib on its inner periphery,

each of the first pedestal and the second pedestal has a joining groove,

the joining rib of the first flange is joined to the joining groove of the first pedestal by ultrasonic welding, and

the joining rib of the second flange is joined to the joining groove of the second pedestal by ultrasonic welding.

8. The method according to claim 6, wherein

an outer diameter of the first pedestal is smaller than an outer diameter of the second pedestal,

the first flange is joined to the first pedestal by caulking, and

the second flange is joined to the second pedestal by ultrasonic welding.

9. The method according to claim 6, wherein

an outer diameter of the first pedestal is smaller than an outer diameter of the second pedestal,

the first flange is joined to the first pedestal with an adhering member, and

the second flange is joined to the second pedestal with an adhering member.