Side top clamping tool

Abstract

The utility model discloses a side top clamping tool which is used for clamping and fixing a workpiece in the machining process. The structure comprises a foundation platform; the positioning table is arranged on the base table, the positioning table is provided with an L-shaped leaning table, and a first supporting face and a positioning face perpendicular to the first supporting face are formed on the leaning table; the supporting tables are arranged on the base table, the number of the supporting tables is at least two, and the tops of the supporting tables are second supporting faces flush with the first supporting faces; the locking mechanism comprises a mounting block, a supporting block and a clamping block, the mounting block is arranged on the base table, the length direction of the mounting block is perpendicular to the length direction of the leaning table, the supporting block is arranged on the mounting block, the position of the supporting block can be adjusted in the length direction of the mounting block, and the clamping block is arranged on the supporting block and arranged on the side, close to the positioning table, of the supporting block. A driving device is arranged between the clamping block and the supporting block and used for driving the clamping block to move in the direction close to or away from the positioning table.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible tooling, in particular to a side-pressing clamping tooling. Background Art

[0002] During the machining process, it is usually necessary to clamp and fix workpieces. For example, in die machining and surface milling of plates, since these workpieces are usually in small batches, the tooling used in the previous batch is usually not universal after changing products.

[0003] The existing problems are as follows: First, the tooling is not universal. If a special tooling is specially processed for a certain product, the processing cost will become higher, which will affect the enterprise's benefits and market competitiveness. Second, the efficiency of line change and debugging is reduced, making the adjustment of the tooling more complex. Third, the applicable range of general clamping tooling is small and the universality is not strong.

[0004] For example, a large aluminum block side-pressing roughing fixture disclosed in the utility model patent with the publication number CN206677591U has very limited workpiece size specifications that the fixture (clamping tooling) can apply to, and the universality is not strong. When changing products, it is necessary to consider replacing the tooling.

[0005] For example, a long board flying surface side-pressing tooling disclosed in the utility model patent with the publication number CN221560493U solves the universality problem, but the force applied during clamping is borne by the lead screw, which requires a high demand for the lead screw. If it is used for the machining of metal molds, the clamping reliability and long-term use stability are difficult to guarantee.

[0006] In view of this, a clamping tooling with strong universality and convenient and fast adjustment when the product specifications change is specially developed. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a side-pressing clamping tooling, which solves at least the problem of clamping and fixing workpieces during the machining process.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A side-top clamping tooling, comprising: a base table; a positioning table disposed on the base table, the positioning table is provided with an L-shaped abutment, and a first support surface and a positioning surface perpendicular to the first support surface are formed on the abutment; a support table disposed on the base table, on one side of the first support surface away from the positioning surface direction, the number of the support tables is at least two, arranged along the length direction of the abutment, the top of the support table is a second support surface, and the second support surface is flush with the first support surface; a locking mechanism, including a mounting block, a support block and a clamping block, the mounting block is disposed on the base table, between two of the support blocks, the length direction of the mounting block is perpendicular to the length direction of the abutment, the height direction of the mounting block is not higher than the top of the support block, the support block is disposed on the mounting block, the support block can adjust its position along the length direction of the mounting block, the clamping block is disposed on the support block, on one side of the support block close to the positioning table direction, a driving device is disposed between the clamping block and the support block, and the driving device is used to drive the clamping block to move in a direction close to or away from the positioning table.

[0010] On the basis of the above solution and as a preferred solution of the above solution: a plurality of mutually parallel T-shaped grooves are arranged on the base table.

[0011] On the basis of the above solution and as a preferred solution of the above solution: the positioning table is provided with a first convex block and a plurality of through holes, the first convex block is disposed at the bottom of the positioning table, the through holes extend from one side of the positioning table away from the first convex block direction towards the first convex block direction and penetrate through the positioning table, the first convex block is embedded in the opening groove of the T-shaped groove, a nut is disposed in the inner groove of the T-shaped groove, a first screw is disposed in the through hole, and after the first screw passes through the through hole, it is in threaded cooperation with the nut to connect the positioning table and the base table.

[0012] On the basis of the above solution and as a preferred solution of the above solution: the bottom of the support table is provided with a second convex block, one end of the second convex block away from the support table direction is provided with a first large end portion with a contour diameter larger than the width of the opening groove of the T-shaped groove, the second convex block is embedded in the opening groove of the T-shaped groove, and the first large end portion is disposed in the inner groove of the T-shaped groove.

[0013] On the basis of the above solution and as an optimized solution of the above solution: A number of third bumps arranged along the length direction of the mounting block are provided at the bottom of the mounting block. One end of the third bump away from the mounting block is provided with a second large end portion whose contour diameter is greater than the width of the opening groove of the T-shaped groove. The bottom of the mounting block is attached to the base table. The third bump is embedded in the opening groove of the T-shaped groove. The second large end portion is arranged in the inner groove of the T-shaped groove. The second large end portion is attached to one side of the inner groove of the T-shaped groove close to the opening groove direction.

[0014] On the basis of the above solution and as an optimized solution of the above solution: The mounting block is of a T-shaped block structure. The support block is provided with a first sliding groove for sliding cooperation with the mounting block. One side of the support block close to the upper side surface of the mounting block is provided with an embedding groove and a first threaded hole penetrating through the embedding groove along the depth direction of the embedding groove. An embedding block capable of sliding along the depth direction of the embedding groove is arranged in the embedding groove. One surface of the embedding block close to the upper side surface of the mounting block is provided with a first pattern for increasing friction. A second screw is arranged in the first threaded hole and is in threaded cooperation with it. Rotating the second screw can push the embedding block to abut against the upper side surface of the mounting block.

[0015] On the basis of the above solution and as an optimized solution of the above solution: The upper side surface of the mounting block is provided with a second pattern for increasing friction.

[0016] On the basis of the above solution and as an optimized solution of the above solution: A first groove extending along the length direction of the mounting block is provided on the upper side of the mounting block. An auxiliary block is embedded in the first groove. The second pattern is arranged on the upper side surface of the auxiliary block.

[0017] On the basis of the above solution and as an optimized solution of the above solution: One side of the support block close to the positioning table is provided with an inclined surface. The position of the inclined surface on the side close to the positioning table is closer to the upper side surface of the mounting block than the position on the side away from the positioning table. The driving device includes a slide rail arranged on the inclined surface. The slide rail extends along the inclined direction of the inclined surface. The clamping block is provided with a second sliding groove for sliding cooperation with the slide rail. One side of the clamping block close to the positioning table is provided with a third support surface parallel to the length direction of the abutting table and perpendicular to the length direction of the mounting block. A connecting block is arranged on the support block. The connecting block is arranged on the side of the slide rail away from the positioning table. A second threaded hole is arranged on the connecting block. A third screw is arranged on the second threaded hole. One end of the third screw abuts against the clamping block. Rotating the third screw can push the clamping block to move towards the positioning table. A spring for driving the clamping block to move away from the positioning table is arranged between the support block and the clamping block.

[0018] Based on the above solution and as a preferred solution to the above solution: a second groove parallel to the slide rail is provided on the inclined surface, a first blocking portion is provided at one end of the second groove close to the positioning table, a second blocking portion extending into the second groove is provided on the clamping block, the spring is arranged in the second groove, and the spring is supported between the first blocking portion and the second blocking portion.

[0019] To solve the problem of clamping and fixing workpieces during the machining process, the utility model has the following beneficial effects:

[0020] The side-top clamping tooling of the utility model can be used for clamping and fixing workpieces during the machining process, such as fixing workpieces during die machining and surface milling of plates. This side-top clamping tooling has strong versatility and is convenient and fast to adjust when dealing with product specification changes.

[0021] Specifically, the base table can be fixed to the processing machine tool, the workpiece is placed on the base table, and the workpiece is supported by the first support surface of the abutment and the second support surface of the support table. Then, the position of the workpiece is adjusted so that one side surface of the workpiece abuts against the positioning surface of the abutment. Then, the position of the support block on the mounting block is adjusted so that the clamping block approaches the surface of the workpiece away from the positioning surface. The clamping block is controlled by the driving device of the locking mechanism, and the clamping block is driven to move towards the direction close to the positioning table, and the workpiece is clamped and fixed by using the clamping block in cooperation with the positioning surface.

[0022] Among them, the design method in which the support block of the locking mechanism can be moved and adjusted on the mounting block increases the use flexibility of this side-top clamping tooling, enabling it to be suitable for clamping and fixing workpieces of different specifications.

[0023] In addition to the purposes, features, and advantages described above, the utility model has other purposes, features, and advantages. The following will refer to the drawings for a further detailed description of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the side-top clamping tooling of the utility model;

[0025] Figure 2 It is an exploded assembly diagram of the side-top clamping tooling of the utility model;

[0026] Figure 3 It is a schematic diagram of the positioning table of the utility model;

[0027] Figure 4 It is a schematic diagram of the support table of the utility model;

[0028] Figure 5 It is a schematic diagram of the locking mechanism of the utility model;

[0029] Figure 6 Schematic exploded view of the mounting block assembly of the present utility model;

[0030] Figure 7 Schematic exploded view of the partial assembly of the driving device of the present utility model;

[0031] Figure 8 Schematic application diagram of the side top clamping tooling of the present utility model. Detailed implementation manners

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0033] Refer to Figure 1-8 , the present utility model discloses a side top clamping tooling, and this side top clamping tooling can be used for clamping and fixing workpieces during the machining process, such as fixing workpieces during die machining and surface milling of plates.

[0034] As Figure 1 shown, this side top clamping tooling includes a base table 100, a positioning table 200, a support table 300, and a locking mechanism 400.

[0035] Among them, the positioning table 200, the support table 300, and the locking mechanism 400 are all arranged on the base table 100. In some cases, the base table 100 can directly be the base of the processing machine, such as the installation table of a machining center.

[0036] Among them, the positioning table 200 is arranged on the base table 100, and the positioning table 200 is provided with an L-shaped abutment 201, and a first support surface 203 and a positioning surface 202 perpendicular to the first support surface 203 are formed on the abutment 201.

[0037] Among them, the support table 300 is arranged on the base table 100, on the side of the first support surface 203 away from the positioning surface 202. The number of support tables 300 is at least two, arranged along the length direction of the abutment 201. The top of the support table 300 is a second support surface 301, and the second support surface 301 is flush with the first support surface 203.

[0038] Among them, the locking mechanism 400 includes a mounting block 401, a support block 407, and a clamping block 415. The mounting block 401 is arranged on the base table 100, between two of the support blocks 407. The length direction of the mounting block 401 is perpendicular to the length direction of the abutment 201. To avoid interference with the workpiece, the height direction of the mounting block 401 is not higher than the top of the support block 407. The support block 407 is arranged on the mounting block 401, and the support block 407 can adjust its position along the length direction of the mounting block 401. The clamping block 415 is arranged on the support block 407, on the side of the support block 407 close to the positioning table 200. A driving device 418 is arranged between the clamping block 415 and the support block 407, and the driving device 418 is used to drive the clamping block 415 to move towards or away from the positioning table 200.

[0039] During specific applications, as Figure 8 shown, the base table 100 can be fixed to the processing machine tool, the workpiece is placed on the base table 100, and the workpiece is supported jointly by the first support surface 203 of the abutment 201 and the second support surface 301 of the support table 300. Then, the position of the workpiece is adjusted so that one side surface of the workpiece abuts against the positioning surface 202 of the abutment 201. Then, the position of the support block 407 on the mounting block 401 is adjusted so that the clamping block 415 is close to the surface of the workpiece on the side away from the positioning surface 202. The clamping block 415 is controlled through the driving device 418 of the locking mechanism 400, and the clamping block 415 is driven to move towards the positioning table 200, and the workpiece is clamped and fixed by using the clamping block 415 in cooperation with the positioning surface 202.

[0040] Among them, the design method that the support block 407 of the locking mechanism 400 can move and adjust on the mounting block 401 increases the use flexibility of this side top clamping fixture, enabling it to be applicable to clamping and fixing workpieces of different specifications.

[0041] In some embodiments, as Figure 2 shown, the positioning table 200 is detachably arranged on the base table 100, the support table 300 can be movably adjusted or freely placed on the base table 100, and the mounting block 401 can be adjusted in position on the base table 100. In such a case, based on the size range of the bottom contour of the workpiece, the positions of the positioning table 200, the support table 300, the locking mechanism 400 and other components can be adaptively adjusted.

[0042] In some embodiments, based on the necessity of actual application, such as factors like the size of the bottom contour of the workpiece, two or more locking mechanisms 400 are selected and arranged.

[0043] In the embodiments of the present disclosure, in order to facilitate the installation of each component such as the positioning table 200, the support table 300, and the locking mechanism 400, a number of mutually parallel T-shaped grooves 101 are arranged on the base table 100.

[0044] Among them, as Figure 2 and Figure 3 shown, the positioning table 200 is provided with a first convex block 204 and a number of through holes 205. The first convex block 204 is arranged at the bottom of the positioning table 200. The through holes 205 extend from one side of the positioning table 200 away from the first convex block 204 towards the first convex block 204 and pass through the positioning table 200. The first convex block 204 is embedded in the opening groove of the T-shaped groove 101. A nut 206 is arranged in the inner groove of the T-shaped groove 101. A first screw 207 is arranged in the through hole 205. After passing through the through hole 205, the first screw 207 is in threaded cooperation with the nut 206 to connect the positioning table 200 and the base table 100.

[0045] Among them, as Figure 4 shown, the bottom of the support table 300 is provided with a second convex block 302. One end of the second convex block 302 away from the support table 300 is provided with a first large end portion 303 whose contour diameter is greater than the width of the opening groove of the T-shaped groove 101. The second convex block 302 is embedded in the opening groove of the T-shaped groove 101, and the first large end portion 303 is arranged in the inner groove of the T-shaped groove 101. First, the position of the support table 300 can be adjusted along the length direction of the T-shaped groove. Second, the support table 300 can be arranged in different T-shaped grooves to adjust the support position of the workpiece.

[0046] Among them, as Figure 2 、 Figure 5 and Figure 6 shown, in order to optimize the installation method of the mounting block 401, a number of third convex blocks 402 arranged along the length direction of the mounting block 401 are provided at the bottom of the mounting block 401. One end of the third convex block 402 away from the mounting block 401 is provided with a second large end portion 403 whose contour diameter is greater than the width of the opening groove of the T-shaped groove 101. The bottom of the mounting block 401 is attached to the base table 100. The third convex block 402 is embedded in the opening groove of the T-shaped groove 101, and the second large end portion 403 is arranged in the inner groove of the T-shaped groove 101. The second large end portion 403 is attached to one side of the inner groove of the T-shaped groove 101 close to the opening groove. The mounting block 401 and the T-shaped groove are connected through the cooperation of the third convex block 402 and the second large end portion 403, which facilitates installation and position adjustment.

[0047] In the embodiments of the present disclosure, as Figure 5 and Figure 7As shown, the mounting block 401 is of a T-shaped block structure. The support block 407 is provided with a first chute 408 for sliding cooperation with the mounting block 401. On one side of the support block 407 close to the upper side of the mounting block 401, a slot 409 and a first threaded hole 410 penetrating through the slot 409 along the depth direction of the slot 409 are provided. An insert block 411 capable of sliding along the depth direction of the slot 409 is arranged in the slot 409. On one side of the insert block 411 close to the upper side of the mounting block 401, a first pattern 412 for increasing friction is provided. A second screw 413 in threaded cooperation with the first threaded hole 410 is arranged in the first threaded hole 410. Rotating the second screw 413 can push the insert block 411 to abut against the upper side of the mounting block 401. When the relative fixation between the mounting block 401 and the support block 407 is realized, the second screw 413 presses the insert block 411 and makes the first pattern 412 act on the upper side of the mounting block 401, making the connection method more reliable. On this basis, further, a second pattern 406 for increasing friction is provided on the upper side of the mounting block 401. Under the interaction of the second pattern 406 and the first pattern 412, the reliability of the connection is further improved.

[0048] When the position of the support block 407 needs to be adjusted, the second screw 413 is moved away from the insert block 411, and the insert block 411 and the upper side of the mounting block 401 are not stressed, so that the support block 407 can slide on the mounting block 401 to adjust the position.

[0049] Among them, in order to optimize the design structure and reduce the processing and manufacturing difficulty of the components of this tooling, a first groove 404 extending along the length direction of the mounting block 401 is provided on the upper side of the mounting block 401. An auxiliary block 405 is embedded in the first groove 404, and the second pattern 406 is provided on the upper side of the auxiliary block 405.

[0050] In the embodiment of the present disclosure, as Figure 7As shown in the figure, one side of the support block 407 close to the positioning table 200 is provided with an inclined surface 414. The position of the inclined surface 414 on the side close to the positioning table 200 is closer to the upper surface of the mounting block 401 than the position on the side far from the positioning table 200. The driving device 418 includes a slide rail 419 (preferably a T-shaped structure) arranged on the inclined surface 414. The slide rail 419 extends along the inclined direction of the inclined surface 414. The clamping block 415 is provided with a second chute 420 which is slidably matched with the slide rail 419. One side of the clamping block 415 close to the positioning table 200 is provided with a third support surface 416 parallel to the length direction of the abutment 201 and perpendicular to the length direction of the mounting block 401. A connecting block 421 is arranged on the support block 407. The connecting block 421 is arranged on the side of the slide rail 419 far from the positioning table 200. A second threaded hole 422 is arranged on the connecting block 421. The depth direction of the second threaded hole 422 is parallel to the length direction of the slide rail 419. A third screw 423 is arranged on the second threaded hole 422. One end of the third screw 423 abuts against the clamping block 415. Rotating the third screw 423 can push the clamping block 415 to move towards the positioning table 200. A spring 424 for driving the clamping block 415 to move away from the positioning table 200 is arranged between the support block 407 and the clamping block 415. When the third screw 423 is rotated in the reverse direction, the spring 424 can push the clamping block 415 to move away from the positioning table 200.

[0051] Wherein, a second groove 425 parallel to the slide rail 419 is arranged on the inclined surface 414. A first stop portion 426 is arranged at one end of the second groove 425 close to the positioning table 200. A second stop portion 417 extending into the second groove 425 is arranged on the clamping block 415. The spring 424 is arranged in the second groove 425. The spring 424 is supported between the first stop portion 426 and the second stop portion 417.

[0052] In summary, the side top clamping tooling has strong versatility and is convenient and fast to adjust when dealing with product specification changes.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A side-top clamping tooling, characterized in that, Comprising: Base table (100); Positioning table (200), arranged on the base table (100), the positioning table (200) is provided with an L-shaped abutment (201), a first support surface (203) and a positioning surface (202) perpendicular to the first support surface (203) are formed on the abutment (201); Support table (300), arranged on the base table (100), on one side of the first support surface (203) in the direction away from the positioning surface (202), the number of the support tables (300) is at least two, arranged along the length direction of the abutment (201), the top of the support table (300) is a second support surface (301), and the second support surface (301) is flush with the first support surface (203); Locking mechanism (400), including a mounting block (401), a support block (407) and a clamping block (415), the mounting block (401) is arranged on the base table (100), between two of the support blocks (407), the length direction of the mounting block (401) is perpendicular to the length direction of the abutment (201), the height direction of the mounting block (401) is not higher than the top of the support block (407), the support block (407) is arranged on the mounting block (401), the support block (407) can adjust its position along the length direction of the mounting block (401), the clamping block (415) is arranged on the support block (407), on the side of the support block (407) close to the positioning table (200), a driving device (418) is arranged between the clamping block (415) and the support block (407), and the driving device (418) is used to drive the clamping block (415) to move towards or away from the positioning table (200).

2. The side top clamping tooling according to claim 1, wherein A number of mutually parallel T-shaped grooves (101) are arranged on the base table (100).

3. The side-top clamping tooling according to claim 2, characterized in that, The positioning table (200) is provided with a first convex block (204) and a number of through holes (205), the first convex block (204) is arranged at the bottom of the positioning table (200), the through holes (205) extend from one side of the positioning table (200) away from the first convex block (204) towards the first convex block (204) and pass through the positioning table (200), the first convex block (204) is embedded in the opening groove of the T-shaped groove (101), a nut (206) is arranged in the inner groove of the T-shaped groove (101), a first screw (207) is arranged in the through hole (205), and after passing through the through hole (205), the first screw (207) is in threaded cooperation with the nut (206) to connect the positioning table (200) and the base table (100).

4. The side top clamping tooling according to claim 2, wherein A second bump (302) is provided at the bottom of the support platform (300). One end of the second bump (302) away from the support platform (300) is provided with a first large end portion (303) whose contour diameter is greater than the opening groove width of the T-shaped groove (101). The second bump (302) is embedded in the opening groove of the T-shaped groove (101), and the first large end portion (303) is arranged in the inner groove of the T-shaped groove (101).

5. The side-top clamping tooling according to claim 2, wherein, A plurality of third bumps (402) arranged along the length direction of the mounting block (401) are provided at the bottom of the mounting block (401). One end of the third bump (402) away from the mounting block (401) is provided with a second large end portion (403) whose contour diameter is greater than the opening groove width of the T-shaped groove (101). The bottom of the mounting block (401) is attached to the base platform (100). The third bump (402) is embedded in the opening groove of the T-shaped groove (101), and the second large end portion (403) is arranged in the inner groove of the T-shaped groove (101). The second large end portion (403) is attached to one side of the inner groove of the T-shaped groove (101) close to the opening groove direction.

6. The side-top clamping tooling according to claim 1, characterized in that The mounting block (401) has a T-shaped block structure. The support block (407) is provided with a first sliding groove (408) that slidably cooperates with the mounting block (401). One side of the support block (407) close to the upper side of the mounting block (401) is provided with an embedding groove (409) and a first threaded hole (410) penetrating along the depth direction of the embedding groove (409) to the embedding groove (409). An embedding block (411) capable of sliding along the depth direction of the embedding groove (409) is arranged in the embedding groove (409). One side of the embedding block (411) close to the upper side of the mounting block (401) is provided with a first pattern (412) for increasing friction. A second screw (413) that is threadedly engaged therewith is arranged in the first threaded hole (410). Rotating the second screw (413) can push the embedding block (411) to abut against the upper side of the mounting block (401).

7. The side-top clamping tooling according to claim 6, characterized in that, A second pattern (406) for increasing friction is provided on the upper side of the mounting block (401).

8. The side-top clamping tooling according to claim 7, characterized in that, A first groove (404) extending along the length direction of the mounting block (401) is provided on the upper side of the mounting block (401). An auxiliary block (405) is embedded in the first groove (404), and the second pattern (406) is provided on the upper side of the auxiliary block (405).

9. The side-top clamping tooling according to claim 1, wherein, One side of the support block (407) close to the positioning table (200) is provided with an inclined surface (414). The position of the inclined surface (414) on the side close to the positioning table (200) is closer to the upper side of the mounting block (401) than the position on the side far from the positioning table (200). The driving device (418) includes a slide rail (419) provided on the inclined surface (414). The slide rail (419) extends along the inclination direction of the inclined surface (414). The clamping block (415) is provided with a second chute (420) which is in sliding fit with the slide rail (419). One side of the clamping block (415) close to the positioning table (200) is provided with a third support surface (416) parallel to the length direction of the abutting platform (201) and perpendicular to the length direction of the mounting block (401). A connecting block (421) is provided on the support block (407). The connecting block (421) is arranged on the side of the slide rail (419) far from the positioning table (200). A second threaded hole (422) is provided on the connecting block (421). A third screw (423) is provided on the second threaded hole (422). One end of the third screw (423) abuts against the clamping block (415). Rotating the third screw (423) can push the clamping block (415) to move towards the positioning table (200). A spring (424) for driving the clamping block (415) to move away from the positioning table (200) is arranged between the support block (407) and the clamping block (415).

10. The side-top clamping tooling according to claim 9, wherein A second groove (425) parallel to the slide rail (419) is provided on the inclined surface (414). One end of the second groove (425) close to the positioning table (200) is provided with a first stop portion (426). A second stop portion (417) extending into the second groove (425) is provided on the clamping block (415). The spring (424) is arranged in the second groove (425). The spring (424) is supported between the first stop portion (426) and the second stop portion (417).

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