Positioning tool for positioning retaining ring and upper footstock and air spring assembling equipment

Abstract

The utility model provides a positioning tool used for positioning a retaining ring and an upper footstock and an air spring assembling equipment, the positioning tool used for positioning the retaining ring and the upper footstock comprises a base, a positioning seat, an adjusting mechanism and a plurality of limiting mechanisms, and the adjusting mechanism and the limiting mechanisms are arranged on the base connected with a crimping machine in a matched mode. In the process of adjusting the height of the upper top seat on the positioning seat up and down through the adjusting mechanism, the upper top seat on the positioning seat can be stopped by the limiting clamping jaw to be limited at a buckling position with a preset height only by rotating the limiting clamping jaw to the first position; after the retaining ring is buckled on the shoulder position of the upper top seat and is limited to the buckling position with the preset height due to the stopping of the limiting clamping jaw, the height position of the upper top seat can be adaptively adjusted according to the height size of the upper top seat, so that the upper top seats with different height sizes and the retaining ring with different height sizes are positioned to the buckling position with the preset height; therefore, the crimping machine has better universality, and the use cost of a user is saved.

Description

Technical Field

[0001] This utility model belongs to the technical field of passenger vehicle air spring assembly equipment, and in particular, it relates to a positioning fixture for positioning buckles and upper top seats and an air spring assembly equipment. Background Technology

[0002] Air springs are gradually becoming more widely used in automotive suspensions. Since air springs are assembled from various components such as the air spring bladder and the top mount, a clamping machine is typically used to neck the clamping ring during the assembly process. The necked-out clamping ring is then pressed onto the connection between the air spring bladder and the top mount, ensuring they are securely fastened together.

[0003] Currently, because the crimping cutter used by crimping machines to achieve buckle necking is in a fixed position, the buckle and upper support usually need to be positioned at a predetermined crimping height to successfully pass through the crimping machine and achieve buckle necking, thus crimping the necked buckle onto the connection between the air spring bladder and the upper support. However, for different models or types of air springs, the height of the upper support is usually different. Due to the difference in the height of the upper support, it is impossible to position the buckle and upper support at the predetermined crimping height using the same crimping machine. This means that a crimping machine of the same model can only crimp and assemble air springs of the same model or type, and cannot crimp and assemble air springs of different models or types, resulting in poor versatility of the crimping machine and increased user costs. Utility Model Content

[0004] Based on the aforementioned problems in the existing technology, the purpose of this utility model embodiment is to provide a positioning fixture for positioning the buckle and upper top seat, which can adaptively adjust the height position of the upper top seat with different height dimensions to position the upper top seat and buckle with different height dimensions at a predetermined clamping position. This solves the problem in the existing technology that due to the difference in the height dimensions of the upper top seat of different models or types of air springs, it is impossible to position the buckle and upper top seat at a predetermined clamping position, resulting in poor versatility of the clamping machine, which cannot clamp and assemble different models or types of air springs.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a positioning fixture for a positioning buckle and an upper top seat, comprising:

[0006] The base is used for connection to the crimping machine;

[0007] Positioning seat, used to support and position the upper top seat;

[0008] An adjustment mechanism is disposed on the base, and a positioning seat is disposed on the adjustment mechanism, so that the adjustment mechanism can adjust the height of the positioning seat vertically; and

[0009] Multiple limiting mechanisms are spaced apart on the base. Each limiting mechanism includes a fixed rod vertically mounted on the base and a limiting claw rotatably mounted on the top of the fixed rod.

[0010] Specifically, when the limiting pawl rotates inward to the first position, the limiting pawl can stop the upper top seat on the positioning seat, thereby limiting the shoulder of the upper top seat to the position of the clamping cutter of the clamping machine, and limiting the buckle to the shoulder of the upper top seat; when the limiting pawl rotates outward to the second position, the limiting pawl releases its stop on the upper top seat, and the limiting pawl releases its restriction on the buckle on the shoulder of the upper top seat.

[0011] Furthermore, the limiting claw includes a hinge seat fixedly connected to the top end of the fixed rod, a rotating part rotatably connected to the hinge seat via a rotating shaft, a swing rod fixedly connected to the rotating part, and a claw part fixedly connected to one end of the swing rod away from the rotating part. The claw part is used to stop the upper top seat on the positioning seat and limit the buckle to the shoulder position of the upper top seat.

[0012] Furthermore, the claw portion is vertically connected to the swing arm to form an L-shaped limiting claw.

[0013] Furthermore, the limiting mechanism also includes a locking structure for locking the rotating part onto the hinge seat to position the limiting claw in a first position.

[0014] Furthermore, the locking structure includes a threaded hole on the hinge seat and a locking screw screwed into the threaded hole.

[0015] Furthermore, the adjustment mechanism includes a lead screw vertically mounted on the base and an adjusting nut screwed onto the lead screw. The positioning seat has a sleeve hole for the lead screw to pass through, the top end of the lead screw passes through the sleeve hole, and the positioning seat is supported on the adjusting nut so that the adjusting nut can drive the positioning seat to move up and down along the axial direction of the lead screw.

[0016] Furthermore, the plurality of limiting mechanisms are distributed at intervals along the circumference of the positioning seat, and the distance between two adjacent limiting mechanisms is equal.

[0017] Furthermore, the base is provided with a connecting flange for connecting to the interface of the crimping machine.

[0018] Furthermore, the positioning seat is provided with a boss for positioning the upper top seat.

[0019] Another objective of this utility model is to provide an air spring assembly device to solve the problem in the prior art that due to the difference in the height of the upper seat of different models or types of air springs, it is impossible to position the upper seat at the corresponding snapping position below the snap ring, resulting in the snapping machine being unable to snap and assemble different models or types of air springs and having poor versatility.

[0020] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an air spring assembly device, including the positioning fixture for positioning buckle and upper top seat provided in any of the above embodiments.

[0021] Compared with the prior art, one or more technical solutions in the embodiments of this utility model have at least one of the following beneficial effects:

[0022] The positioning fixture and air spring assembly equipment for positioning buckles and upper seats in this embodiment of the utility model, by setting an adjustment mechanism and multiple limiting mechanisms on a base connected to a buckling machine, and installing a positioning seat adapted to the model or type of the upper seat on the adjustment mechanism, after the upper seat is supported and positioned on the positioning seat, it is only necessary to rotate the limiting claw inward to the first position. During the process of adjusting the height of the upper seat on the positioning seat by adjusting the adjustment mechanism, the upper seat on the positioning seat can be stopped by the limiting claw and limited to the buckling position at a predetermined height. At this time, the bottom port of the air spring airbag is fitted onto the shoulder of the upper seat, and the necked buckle is buckled at the connection between the air spring airbag and the upper seat. After the buckle is buckled at the shoulder of the upper seat and is stopped by the limiting claw and limited to the buckling position at a predetermined height, the height position of the upper seat can be adaptively adjusted according to its height size, so as to position the upper seat and buckle of different height sizes at the buckling position at a predetermined height. Furthermore, the positioning fixture for positioning the buckle and the upper top seat provided in this embodiment of the utility model can replace the corresponding positioning seat according to the model or type of the upper top seat, and the height of the upper top seat can be adjusted up and down by adjusting the mechanism. This can effectively overcome the problem that the buckle and the upper top seat cannot be positioned at the predetermined clamping position due to the difference in the height of the upper top seat of different models or types of air springs. Therefore, the clamping machine can clamp and assemble different models or types of air springs, thus making the clamping machine more versatile. Users do not need to purchase a separate clamping machine for different models or types of air springs, saving users' operating costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A three-dimensional structural schematic diagram of the positioning fixture for positioning buckle and upper top seat provided in an embodiment of this utility model;

[0025] Figure 2 This is a front view structural schematic diagram of the positioning fixture for positioning buckle and upper top seat provided in an embodiment of the present utility model;

[0026] Figure 3 A cross-sectional view of the positioning fixture for the positioning buckle and the upper top seat provided in an embodiment of this utility model;

[0027] Figure 4 A top view of the positioning fixture for the positioning buckle and the upper top seat provided in an embodiment of this utility model;

[0028] Figure 5 A three-dimensional structural diagram of the limiting mechanism provided in the embodiment of this utility model;

[0029] Figure 6 Exploded view of the limiting mechanism provided in the embodiment of this utility model;

[0030] Figure 7 A three-dimensional structural schematic diagram of the positioning seat provided in another embodiment of the present utility model;

[0031] Figure 8 A three-dimensional structural diagram of the connecting flange provided in an embodiment of this utility model;

[0032] Figure 9 A three-dimensional structural diagram of the connection between the air spring airbag and the upper seat provided in an embodiment of this utility model;

[0033] Figure 10 An exploded view of the positioning fixture for the positioning buckle and the upper seat provided in the embodiment of this utility model.

[0034] The following are the labeling elements in the figure:

[0035] 1-Base; 2-Positioning seat; 21-Boss;

[0036] 3-Adjusting mechanism; 31-Lead screw; 32-Adjusting nut;

[0037] 4-Limiting mechanism; 41-Fixing rod; 42-Limiting claw; 421-Hinge seat; 422-Rotating part; 423-Swing rod; 424-Claw part; 43-Locking structure; 431-Threaded hole; 432-Locking screw;

[0038] 5-Top mount; 5-Shoulder; 6-Air spring airbag; 7-Hook ring;

[0039] 8-Rotating shaft; 9-Connecting flange; 10-Foolproof structure. Detailed Implementation

[0040] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0041] It should be noted that when an element is referred to as "connected to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0043] Please refer to the following: Figures 1 to 10 The positioning fixture for the positioning buckle and the upper top seat provided in this embodiment of the utility model will now be described. Please refer to the following for further details. Figure 1 , Figure 2 and Figure 3 The positioning fixture for positioning buckles and upper top seats provided in this embodiment of the utility model includes a base 1, a positioning seat 2, an adjustment mechanism 3, and multiple limiting mechanisms 4. The base 1 is a plate-shaped seat body, used to connect to the interface on the buckling machine. The positioning seat 2 supports and positions the upper top seat 5. The adjustment mechanism 3 is disposed on the base 1, and the positioning seat 2 is disposed on the adjustment mechanism 3. The adjustment mechanism 3 can adjust the height of the positioning seat 2 up and down, so that the height of the upper top seat 5 of the positioning seat 2 can be adjusted. Multiple limiting mechanisms 4 are spaced apart on the base 1. Each limiting mechanism 4 includes a fixed rod 41 vertically disposed on the base 1 and a limiting claw 42 rotatably disposed on the top of the fixed rod 41. The bottom end of the fixed rod 41 is fixedly connected to the base 1 by bolts. For further details, please refer to the following references. Figure 2 , Figure 3 and Figure 4 When the limiting pawl 42 rotates inward to the first position, it stops the upper top seat 5 on the positioning seat 2, thus limiting the shoulder 51 of the upper top seat 5 to the position of the clamping cutter of the clamping machine (the clamping position at a predetermined height), and limiting the buckle 7 to the position of the shoulder 51 of the upper top seat 5 (the clamping position at a predetermined height). When the limiting pawl 42 rotates outward to the second position, it releases its stop on the upper top seat 5, and also releases its limitation on the buckle 7 on the shoulder 51 of the upper top seat 5. In use, simply connect the base 1 to the interface on the crimping machine, rotate the limiting claw 42 outward to the second position, install the positioning seat 2 that matches the model or type of the upper top seat 5 onto the adjustment mechanism 3, then support and position the upper top seat 5 onto the positioning seat 2, then rotate the limiting claw 42 inward to the first position, and then adjust the height of the positioning seat 2 up and down using the adjustment mechanism 3 until the limiting claw 42 stops the upper top seat 5 on the positioning seat 2, preventing the upper top seat 5 from moving upward further. Until the stop is reached, the shoulder 51 of the upper top seat 5 is limited to the position of the clamping cutter of the clamping machine (the clamping position at a predetermined height) under the stop action of the limiting claw 42. At this time, the bottom port of the air spring bladder 6 is fitted onto the shoulder 51 of the upper top seat 5, and the necked buckle 7 is clamped at the connection between the air spring bladder 6 and the upper top seat 5 until the buckle 7 is clamped at the shoulder 51 position of the upper top seat 5 (the clamping position at a predetermined height) and is stopped by the limiting claw 42 and cannot move downward for further adjustment.

[0044] The positioning fixture for positioning buckles and upper top seats provided in this embodiment of the utility model, compared with the prior art, is achieved by setting an adjustment mechanism 3 and multiple limiting mechanisms 4 on a base 1 connected to a buckling machine, and installing a positioning seat 2 adapted to the model or type of the upper top seat 5 on the adjustment mechanism 3. After supporting and positioning the upper top seat 5 on the positioning seat 2, it is only necessary to rotate the limiting claw 42 inward to the first position. During the process of adjusting the height of the upper top seat 5 on the positioning seat 2 by adjusting the adjustment mechanism 3, the upper top seat 5 on the positioning seat 2 can be controlled by the limiting claw. The stop 42 limits the upper seat 6 to a predetermined height. At this time, the bottom port of the air spring 6 is fitted onto the shoulder 51 of the upper seat 5, and the constricted buckle 7 is fastened at the connection between the air spring 6 and the upper seat 5. After the buckle 7 is fastened to the shoulder 51 of the upper seat 5 and limited to a predetermined height by the stop 42, the height of the upper seat 5 can be adaptively adjusted according to its height size, so as to position the upper seat 5 and the buckle 7 of different height sizes at the predetermined height. Furthermore, the positioning fixture for positioning the buckle and the upper top seat provided in this embodiment of the utility model can replace the corresponding positioning seat 2 according to the model or type of the upper top seat 5, and adjust the height of the upper top seat 5 by adjusting the mechanism 3. This can effectively overcome the problem that the buckle 7 and the upper top seat 5 cannot be positioned at the predetermined height due to the difference in the height of the upper top seat 5 of different models or types of air springs. Therefore, the buckling machine can buckle and assemble air springs of different models or types, thus making the buckling machine more versatile. Users do not need to purchase a separate buckling machine for different models or types of air springs, saving users' operating costs.

[0045] Please refer to the following: Figure 3 , Figure 5 and Figure 6 In some embodiments, the limiting claw 42 includes a hinge seat 421, a rotating part 422, a swing rod 423, and a claw part 424. The hinge seat 421 is fixedly connected to the top end of the fixed rod 41. The rotating part 422 is rotatably connected to the hinge seat 421 via a rotating shaft 8. The swing rod 423 is fixedly connected to the rotating part 422. The claw part 424 is fixedly connected to the end of the swing rod 423 away from the rotating part 422. The claw part 424 is used to stop the upper top seat 5 on the positioning seat 2 and to limit the buckle 7 to the shoulder 51 position of the upper top seat 5. In this embodiment, the swing rod 423 drives the claw part 424 to rotate between a first position and a second position, which facilitates the adjustment of the positioning seat 2, the upper top seat 5, and the buckle 7. It should be noted that in some specific application scenarios, the claw part 424 and the swing rod 423 are connected at an angle. The angle between the claw part 424 and the swing rod 423 is preferably a right angle, that is, the claw part 424 and the swing rod 423 are vertically connected to form an L-shaped limiting claw 42.

[0046] Please refer to the following: Figure 1 , Figure 3 and Figure 6 In some embodiments, the limiting mechanism 4 further includes a locking structure 43 for locking the rotating part 422 onto the hinge seat 421 to position the limiting claw 42 in a first position. In this embodiment, by providing the locking structure 43 on the hinge seat 421, the rotating part 422 is locked onto the hinge seat 421, preventing the rotating part 422 from rotating relative to the hinge seat 421. This achieves the positioning of the limiting claw 42 in the first position, improving the stability of the limiting claw 42 in limiting the upper top seat 5 and the buckle 7, and preventing the limiting claw 42 from slipping off the shoulder 51 of the upper top seat 5.

[0047] Please refer to the following: Figure 1 , Figure 3 and Figure 6 In some embodiments, the locking structure 43 includes a threaded hole 431 on the hinge seat 421 and a locking screw 432 screwed into the threaded hole 431. By tightening the locking screw 432 in the threaded hole 431, the rotating part 422 of the locking screw 432 is locked onto the hinge seat 421, preventing the rotating part 422 from rotating relative to the hinge seat 421. To further improve the stability of the locking, a locking hole for inserting the locking screw 432 can be correspondingly provided on the rotating part 422, or multiple threaded holes 431 can be provided on the hinge seat 421, with a locking screw 432 screwed into each threaded hole 431. Understandably, in other embodiments, the locking structure 43 may also include a through hole on the hinge seat 421 and a locking rod inserted into the through hole, with the locking rod preventing the rotating part 422 from rotating relative to the hinge seat 421.

[0048] Please refer to the following: Figure 2 , Figure 3 and Figure 10In some embodiments, the adjusting mechanism 3 includes a lead screw 31 and an adjusting nut 32. The lead screw 31 is vertically mounted on the base 1, and its bottom end is fixedly connected to the base 1 by bolts. The adjusting nut 32 is screwed onto the lead screw 31. The positioning seat 2 has a sleeve hole for the lead screw 31 to pass through, and the top end of the lead screw 31 passes through the sleeve hole of the positioning seat 2, enabling the positioning seat 2 and the adjusting mechanism 3 to be detachably installed. This allows the positioning seat 2 to be replaced according to different models or types of air spring upper seats 5, making the positioning fixtures used for the positioning buckle and upper seat compatible with different models or types of air spring upper seats 5, thus improving versatility. Furthermore, after the top end of the lead screw 31 passes through the sleeve hole of the positioning seat 2, the positioning seat 2 can be supported on the adjusting nut 32, allowing the adjusting nut 32 to drive the positioning seat 2 to move up and down along the axial direction of the lead screw 31. This enables the adjusting mechanism 3 to adjust the height of the positioning seat 2, allowing the upper seat 5 of the positioning seat 2 to be height-adjusted. It should be noted that in some other embodiments, the adjustment mechanism 3 may also be a height adjustment mechanism such as a cylinder, hydraulic cylinder, electric cylinder, ball screw 31 mechanism or linear motion module to achieve height adjustment.

[0049] Please refer to the following: Figure 4 In some embodiments, multiple limiting mechanisms 4 are distributed circumferentially along the positioning seat 2, and the distance between two adjacent limiting mechanisms 4 is equal. This is beneficial to improve the balanced force applied by the limiting mechanisms 4 to the shoulder 51 of the upper top seat 5, thereby improving the stability of the limiting claw 42 in limiting the upper top seat 5 and the buckle 7.

[0050] Please refer to the following: Figure 1 , Figure 8 and Figure 10 In some embodiments, the base 1 is provided with a connecting flange 9 for connecting to the interface of the crimping machine. The connecting flange 9 is fixedly connected to the base 1 by bolts. The connecting flange 9 is provided with a foolproof structure 10, which facilitates the operator to quickly install the interface between the base 1 and the crimping machine.

[0051] Please refer to the following: Figure 3 , Figure 7 and Figure 10 In some embodiments, the positioning seat 2 is provided with a boss 21 for positioning the upper top seat 5. The upper top seat 5 is positioned by inserting the boss 21 into the stepped hole at the bottom of the upper top seat 5. On the one hand, it can realize quick assembly and disassembly of the upper top seat 5 and the positioning seat 2, and on the other hand, it can enhance the stability of the positioning seat 2 in supporting and positioning the upper top seat 5.

[0052] This utility model embodiment also provides a crimping device for assembling air springs, which includes the positioning fixture for positioning the buckle and the upper top seat provided in any of the above embodiments. Since this crimping device for assembling air springs has all the technical features of the positioning fixture for positioning the buckle and the upper top seat provided in any of the above embodiments, it has the same technical effect as the positioning fixture for positioning the buckle and the upper top seat.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning tool for positioning a clamping ring and an upper top seat, characterized in that, include: The base is used for connection to the crimping machine; Positioning seat, used to support and position the upper top seat; An adjustment mechanism is disposed on the base, and a positioning seat is disposed on the adjustment mechanism, so that the adjustment mechanism can adjust the height of the positioning seat vertically; and Multiple limiting mechanisms are spaced apart on the base. Each limiting mechanism includes a fixed rod vertically mounted on the base and a limiting claw rotatably mounted on the top of the fixed rod. When the limiting claw rotates inward to the first position, the limiting claw can stop the upper top seat on the positioning seat, so as to limit the shoulder of the upper top seat to the position of the buckling cutter of the buckling machine, and limit the buckle to the shoulder position of the upper top seat. When the limiting pawl rotates outward to the second position, the limiting pawl releases its stop on the upper top seat, and the limiting pawl also releases its restriction on the buckle on the shoulder of the upper top seat.

2. The positioning tool for positioning the clamping ring and the upper top seat according to claim 1, wherein, The limiting claw includes a hinge seat fixedly connected to the top end of the fixed rod, a rotating part rotatably connected to the hinge seat via a rotating shaft, a swing rod fixedly connected to the rotating part, and a claw part fixedly connected to one end of the swing rod away from the rotating part. The claw part is used to stop the upper top seat on the positioning seat and limit the buckle to the shoulder position of the upper top seat.

3. The positioning tool for positioning the clamping ring and the upper top seat according to claim 2, wherein, The claw portion is vertically connected to the swing arm to form an L-shaped limiting claw.

4. The positioning tool for positioning the clamping ring and the upper top seat according to claim 2, wherein, The limiting mechanism further includes a locking structure for locking the rotating part onto the hinge seat to position the limiting claw in a first position.

5. The positioning tool for positioning the clamping ring and the upper top seat according to claim 4, wherein, The locking structure includes a threaded hole on the hinge seat and a locking screw screwed into the threaded hole.

6. The positioning tool for positioning the clamping ring and the upper top seat according to claim 1, wherein, The adjustment mechanism includes a lead screw vertically mounted on the base and an adjusting nut screwed onto the lead screw. The positioning seat has a sleeve hole for the lead screw to pass through, and the top end of the lead screw passes through the sleeve hole. The positioning seat is supported on the adjusting nut so that the adjusting nut can drive the positioning seat to move up and down along the axial direction of the lead screw.

7. The positioning fixture for positioning the buckle and the upper top seat as described in claim 1, characterized in that, The plurality of limiting mechanisms are distributed at intervals along the circumference of the positioning seat, and the distance between two adjacent limiting mechanisms is equal.

8. The positioning tool for positioning the clamping ring and the upper top seat according to claim 1, wherein, The base is provided with a connecting flange for connecting to the interface of the crimping machine.

9. The positioning tool for positioning the grommet and the upper top holder according to any one of claims 1 to 8, wherein, The positioning seat is provided with a boss for positioning the upper top seat.

10. An air spring assembly apparatus, characterized by, The positioning fixture for positioning buckle and upper top seat as described in any one of claims 1 to 9 is included.

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