Cup cover unlocked by pressing and pushing

By designing a beveled surface and a contact part to press and push to unlock the cup lid, the problem of traditional push-button cup buttons being laborious and prone to misalignment is solved, enabling quick one-handed unlocking and locking, thus improving the user experience.

CN223873684UActive Publication Date: 2026-02-06YONGKANG ZHENQI IND DESIGN CO LTD
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Patent Information

Application Number
CN202520722707.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-15
Publication Date
2026-02-06
Estimated Expiration
2035-04-15

AI Technical Summary

Technical Problem

Traditional push-button water cups have buttons that are not easy to use, and the buttons are prone to shifting and getting stuck during use, resulting in low unlocking efficiency and requiring two-hand operation.

Method used

A cup lid designed for pressing and pushing to unlock is described. Through the cooperation of the inclined surface and the contact part, and by utilizing the movement of the elastic element and the locking element, it can be unlocked and locked with one hand. The design includes the structure of the lid body, the mounting base, the pressing block, the pushing block and the locking element.

Benefits of technology

It enables quick unlocking and locking with one hand, improving efficiency, extending the lifespan of the locking mechanism, and preventing button misalignment and jamming.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of articles for daily use, in particular to a cup cover unlocked by pressing and pushing, which comprises a cover body and a mounting seat which are connected with each other, a pressing block is connected onto the cover body in a sliding manner, an avoiding hole is arranged on the cover body, the pressing block is provided with a first pushing block, a first inclined surface is arranged on the first pushing block, and a clamping piece is arranged on the mounting seat. The clamping piece comprises a clamping hook and a driven part which are connected with each other, the driven part is provided with a first contact part, the first inclined surface extrudes the first contact part, and the first pushing block can push the clamping piece to move outwards; the mounting base is provided with a mounting disc, the pressing block is attached to the mounting disc, the mounting disc and the mounting base jointly abut against an elastic part, the mounting disc is provided with a second pushing block, the second pushing block is provided with a second inclined face, the driven part is provided with a second contact part, the second inclined face extrudes the second contact part, and the second pushing block can push the clamping part to move inwards; the push type cup cover solves the problems that a button of a traditional push type cup cover is not labor-saving enough and not convenient to use.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the field of daily necessities, especially to a cup cover which is unlocked by pressing and pushing. BACKGROUND

[0002] The most common water cup in daily life is a threaded one, but it is easy to screw the threaded cup cover too loosely or too tightly, resulting in water leakage or excessive sealing of the cup cover, and the threaded water cup needs to be operated with both hands, and the operation space is limited in some scenarios, and the user cannot open the threaded water cup with one hand.

[0003] Therefore, a pressing type water cup appears, which can be opened by pressing a button on the cup cover with one hand, making it more convenient for the user to drink water, but the pressing mechanism of the traditional pressing type water cup is relatively complex, it is laborious for the user to press the button from top to bottom, the unlocking efficiency of the cup cover is not fast enough, and the components inside the button are prone to deviation and jamming during use, greatly affecting the use efficiency of the pressing type cup cover. UTILITY MODEL CONTENT

[0004] To solve the above problems, the utility model provides a cup cover which is unlocked by pressing and pushing, solving the problems of the button of the traditional pressing type cup cover being not labor-saving and being not convenient to use.

[0005] The technical scheme adopted by the utility model is: a cup cover which is unlocked by pressing and pushing, comprising a cover body and a mounting seat connected with each other, further comprising a pressing block, the pressing block and the cover body are connected in sliding mode, the cover body is provided with an avoiding hole for the pressing block to pass through, the bottom of the pressing block is provided with a first pushing block, the first pushing block is provided with a first inclined surface, the mounting seat is provided with a clamping piece which slides horizontally, the clamping piece comprises a clamping hook and a driven part connected with each other, the driven part is provided with a first contact part, the first inclined surface presses the first contact part, and the first pushing block can push the clamping piece to move outward; the mounting seat is further provided with a mounting disc, the pressing block and the mounting disc are attached, the mounting disc and the mounting seat are jointly abutted with an elastic piece, the mounting disc is provided with a second pushing block, the second pushing block is provided with a second inclined surface, the driven part is further provided with a second contact part, the second inclined surface presses the second contact part, and the second pushing block can push the clamping piece to move inward.

[0006] By the technical scheme, the user applies a driving force to the pressing block to make the pressing block slide downward, drives the first pushing block to move downward, transmits the driving force to the driven part through the extrusion of the first inclined surface on the first contact part, enables the first pushing block to drive the clamping piece to move outward, extrudes the mounting disc downward by the pressing block and enables the elastic piece to be compressed under force, enables the second pushing block to also move downward, until the clamping hook releases the locking action on the cup cover, and the user can remove the cup cover; the user removes the force applied to the pressing block, the elastic piece rebounds upward to reset, enables the mounting disc to move upward, drives the second pushing block to move upward, transmits the driving force to the driven part through the extrusion of the second inclined surface on the second contact part, enables the second pushing block to drive the clamping piece to move inward, extrudes the mounting disc upward by the pressing block, enables the first pushing block to also move upward, enables the clamping hook to lock the cup cover, and the pressing block slides on the cover body to the initial position; the user only needs to use one hand to drive the pressing block to unlock the cup cover, the opening of the cup cover is very convenient, the cooperation of the first inclined surface on the first pushing block and the first contact part and the cooperation of the second inclined surface on the second pushing block and the second contact part enable the pressing block to be pushed more labor-saving, the mounting disc resets more quickly, the opening, unlocking and resetting of the cup cover are more efficient, and the user experience is greatly improved.

[0007] Further, the driven part is provided with a first connecting opening, the first contact part is arranged in the first connecting opening, and the first pushing block is always located in the first connecting opening.

[0008] By the technical scheme, the first pushing block is always located in the first connecting opening, the first connecting opening can limit the first pushing block when the first pushing block moves, to prevent the first pushing block from deviating or being separated, and the arrangement of the first connecting opening makes the overall structure of the driven part more firm, effectively prolonging the service life of the clamping piece.

[0009] Further, the first contact part is an inclined surface, the first inclined surface is inclined downward, the first contact part is inclined upward, and the first inclined surface and the first contact part are in abutment.

[0010] By the technical scheme, the first contact part is designed as an inclined surface, and the abutment cooperation of the first inclined surface inclined downward and the first contact part inclined upward makes the first pushing block very smooth when the first pushing block drives the clamping piece in the first connecting opening, the user is more labor-saving when driving the pressing block to slide, and the use is more convenient.

[0011] Further, the driven part is provided with a second connecting opening, the second contact part is arranged in the second connecting opening, and the second pushing block is always located in the second connecting opening.

[0012] Through the technical scheme, the second pushing block is always located at the second connecting port, so that the second connecting port can limit the second pushing block when the second pushing block moves, preventing the second pushing block from deviating or separating, and the second connecting port makes the overall structure of the driven part more firm, effectively prolonging the service life of the clamping piece.

[0013] Further, the second contact part is a slope, the second slope is obliquely upward, the second contact part is obliquely downward, and the second slope and the second contact part abut.

[0014] Through the technical scheme, the structure of the second contact part is designed as a slope, and the abutting cooperation of the second slope obliquely upward and the second contact part obliquely downward makes the second pushing block very smooth when pushing the clamping piece in the second connecting port, the user is more labor-saving when driving the pressing block to slide, and the use is more convenient.

[0015] Further, the mounting seat is further provided with a detachable positioning block, the positioning block is located above the clamping piece, and the clamping piece is limited by the positioning block.

[0016] Through the technical scheme, the positioning block is provided, so that the clamping piece can be limited by the positioning block when sliding on the mounting seat, avoiding deviation of the clamping piece during movement, making the movement path of the clamping piece on the mounting seat very stable, and ensuring normal realization of the function of the clamping piece.

[0017] Further, the mounting seat is provided with a limiting gap, the limiting gap is located above the driven part, the positioning block is sheet-shaped, and the positioning block is clamped in the limiting gap.

[0018] Through the technical scheme, the limiting gap is arranged above the driven part, so that the driven part can be limited when being pushed, making the clamping piece as a whole more stable when sliding, and the sheet-shaped positioning block can be quickly assembled into the limiting gap, making the disassembly and assembly of the positioning block on the mounting seat very convenient.

[0019] Further, the bottom of the pressing block is provided with an annular protrusion, the mounting disc is correspondingly provided with an annular groove, and the annular protrusion and the annular groove are embedded.

[0020] Through the technical scheme, the embedding of the annular protrusion and the annular groove makes the connection of the pressing block and the mounting disc very stable, the annular groove can limit the sliding pressing block, avoiding slipping of the pressing block on the mounting disc, and the annular protrusion increases the contact area of the pressing block and the mounting disc, making the overall stress of the mounting disc very uniform when being driven.

[0021] Further, the bottom of the avoiding hole is provided with a ring-shaped flange, and the outer sidewall of the pressing block is provided with a ring-shaped step surface, and the ring-shaped flange can abut against the ring-shaped step surface.

[0022] Through the technical scheme, the pressing block can slide upward under the resilience of the elastic member, and the ring-shaped step surface and the ring-shaped flange abut against each other in the process of the upward movement of the pressing block, so that the initial position of the pressing block on the cover body can be accurately positioned, and the excessive sliding of the pressing block in the avoiding hole is prevented, and the normal use of the cup cover is affected. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative labor.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 It is a sectional view of the present application;

[0026] Figure 3 It is an explosion diagram of the present application;

[0027] Figure 4 It is a schematic diagram of the cover structure of the present application;

[0028] Figure 5 It is a schematic diagram of the pressing block structure of the present application;

[0029] Figure 6 It is a schematic diagram of the mounting disc structure of the present application;

[0030] Figure 7 It is a schematic diagram of the clamping piece structure of the present application;

[0031] Figure 8 It is a schematic diagram of the clamping piece structure of the present application;

[0032] Figure 9 It is a schematic diagram of the mounting seat structure of the present application;

[0033] The utility model label information is as follows:

[0034] 1, cover; 2, mounting seat; 3, pressing block; 4, avoiding hole; 5, first pushing block; 6, first inclined surface; 7, clamping piece; 701, clamping hook; 702, driven part; 8, first contact part; 9, second contact part; 10, mounting disc; 11, second pushing block; 12, second inclined surface; 13, first connecting port; 14, second connecting port; 15, positioning block; 16, limiting notch; 17, annular protrusion; 18, annular groove; 19, annular flange; 20, annular step surface; 21, elastic piece;

[0035] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0037] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0038] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0039] Reference Figures 1-9As shown, a push-pull unlocking cup cover comprises a cover body 1 and a mounting base 2 connected with each other, and a pressing block 3, the pressing block 3 and the cover body 1 are in sliding connection, the cover body 1 is provided with a clearance hole 4 for the pressing block 3 to pass through, the bottom of the pressing block 3 is provided with a first push block 5, the first push block 5 is provided with a first inclined surface 6, the mounting base 2 is provided with a transversely sliding clamping piece 7, the clamping piece 7 comprises a clamping hook 701 and a driven part 702 connected with each other, the driven part 702 is provided with a first contact part 8, the first inclined surface 6 extrudes the first contact part 8, and the first push block 5 can push the clamping piece 7 to move outward; the mounting base 2 is further provided with a mounting disc 10, the pressing block 3 is attached to the mounting disc 10, the mounting disc 10 and the mounting base 2 jointly abut against an elastic piece 21, the mounting disc 10 is provided with a second push block 11, the second push block 11 is provided with a second inclined surface 12, and the driven part 702 is further provided with a second contact part 9, the second inclined surface 12 extrudes the second contact part 9, and the second push block 11 can push the clamping piece 7 to move inward. The user applies a driving force to the pressing block 3 to make the pressing block 3 slide downward, drives the first push block 5 to move downward, transmits the driving force to the driven part 702 through the extrusion of the first inclined surface 6 on the first contact part 8, allows the first push block 5 to push the clamping piece 7 to move outward, simultaneously extrudes the mounting disc 10 downward by the pressing block 3 and allows the elastic piece 21 to be compressed under stress, so that the second push block 11 also moves downward until the clamping hook 701 releases the locking effect on the cup cover, and the user can remove the cup cover; the user removes the force applied to the pressing block 3, and the elastic piece 21 returns to the original position upward, so that the mounting disc 10 moves upward, drives the second push block 11 to move upward, transmits the driving force to the driven part 702 through the extrusion of the second inclined surface 12 on the second contact part 9, allows the second push block 11 to push the clamping piece 7 to move inward, simultaneously extrudes the pressing block 3 upward by the mounting disc 10, so that the first push block 5 also moves upward, allows the clamping hook 701 to lock the cup cover, and the pressing block 3 slides on the cover body 1 to the initial position; the user only needs to use one hand to drive the pressing block 3 to unlock the cup cover, so that the opening of the cup cover is very convenient, and the cooperation of the first inclined surface 6 on the first push block 5 and the first contact part 8 and the cooperation of the second inclined surface 12 on the second push block 11 and the second contact part 9 make the pressing block 3 more labor-saving to push, the mounting disc 10 is more rapid during resetting, the opening, unlocking and resetting of the cup cover are more efficient, and the user experience is greatly improved.

[0040] Preferably, the elastic piece 21 is a spring, which is convenient for factory production and assembly.

[0041] Preferably, the number of the first pushing blocks 5 on the pressing block 3 is six, and the six first pushing blocks 5 are evenly distributed in the circumference of the pressing block 3; the number of the second pushing blocks 11 on the mounting disc 10 is six, and the six second pushing blocks 11 are evenly distributed in the circumference of the mounting disc 10; the number of the clamping pieces 7 on the mounting seat 2 is six, and the six clamping pieces 7 are evenly distributed in the circumference of the mounting seat 2.

[0042] Referring to Figure 2 , 3 , 4, 5, 7, the driven part 702 is provided with a first connecting port 13, the first contact part 8 is arranged in the first connecting port 13, and the first pushing block 5 is always located in the first connecting port 13. The first pushing block 5 is always located in the first connecting port 13, so that the first connecting port 13 can limit the first pushing block 5 when the first pushing block 5 moves, preventing the first pushing block 5 from deviating or separating, and the arrangement of the first connecting port 13 makes the overall structure of the driven part 702 more firm, effectively prolonging the service life of the clamping piece 7.

[0043] Referring to Figure 2 , 3 , 4, 5, 7, the first contact part 8 is a slope, the first slope 6 is inclined downward, the first contact part 8 is inclined upward, and the first slope 6 and the first contact part 8 abut. The first contact part 8 is designed as a slope, and the abutment of the first slope 6 inclined downward and the first contact part 8 inclined upward makes the first pushing block 5 very smooth when pushing the clamping piece 7 in the first connecting port 13, so that the user is more labor-saving when driving the pressing block 3 to slide, and the use is more convenient.

[0044] Referring to Figure 2 , 3 , 4, 5, 8, the driven part 702 is provided with a second connecting port 14, the second contact part 9 is arranged in the second connecting port 14, and the second pushing block 11 is always located in the second connecting port 14. The second pushing block 11 is always located in the second connecting port 14, so that the second connecting port 14 can limit the second pushing block 11 when the second pushing block 11 moves, preventing the second pushing block 11 from deviating or separating, and the arrangement of the second connecting port 14 makes the overall structure of the driven part 702 more firm, effectively prolonging the service life of the clamping piece 7.

[0045] Referring to Figure 2 , 3As shown in FIGS. 4, 5, 8, the second contact portion 9 is a bevel, the second bevel 12 is inclined upward, the second contact portion 9 is inclined downward, and the second bevel 12 and the second contact portion 9 abut. The structure of the second contact portion 9 is designed as a bevel, and the abutment of the second bevel 12 inclined upward and the second contact portion 9 inclined downward makes the second push block 11 very smooth when pushing the clamping piece 7 in the second connecting port 14, and the user is more labor-saving when driving the press block 3 to slide, and it is more convenient to use.

[0046] Referring to Figure 2 , 3 , 9, the mounting seat 2 is further provided with a detachable positioning block 15, the positioning block 15 is located above the clamping piece 7 and limits the clamping piece 7. The positioning block 15 makes the clamping piece 7 be limited by the positioning block 15 when sliding on the mounting seat 2, avoids the clamping piece 7 from deviating during movement, and makes the movement path of the clamping piece 7 on the mounting seat 2 very stable, thereby ensuring the normal implementation of the function of the clamping piece 7.

[0047] Preferably, the number of the positioning blocks 15 on the mounting seat 2 is six, and the positioning block 15 corresponds to the clamping piece 7 one by one.

[0048] Referring to Figure 2 , 3 , 9, the mounting seat 2 is provided with a limiting gap 16, the limiting gap 16 is located above the driven portion 702, the positioning block 15 is sheet-shaped, and the positioning block 15 is clamped in the limiting gap 16. The limiting gap 16 is arranged above the driven portion 702 so that the driven portion 702 can be limited when being pushed, and the clamping piece 7 is more stable when sliding as a whole, and the sheet-shaped positioning block 15 can be quickly assembled into the limiting gap 16, so that the positioning block 15 is very convenient to disassemble and assemble on the mounting seat 2.

[0049] Referring to Figure 2 , 3 , 5, 6, the press block 3 is provided with an annular protrusion 17 at the bottom, the mounting disc 10 is correspondingly provided with an annular groove 18, and the annular protrusion 17 and the annular groove 18 are embedded. The embedding of the annular protrusion 17 and the annular groove 18 makes the connection of the press block 3 and the mounting disc 10 very stable, the annular groove 18 can limit the sliding press block 3, avoids the press block 3 from slipping on the mounting disc 10, and the annular protrusion 17 increases the contact area of the press block 3 and the mounting disc 10, so that the mounting disc 10 is very uniform in stress when being driven.

[0050] Referring to Figures 2-3As shown, the bottom of the avoiding hole 4 is provided with a ring-shaped flange 19, and the outer sidewall of the pressing block 3 is provided with a ring-shaped step surface 20, and the ring-shaped flange 19 can abut against the ring-shaped step surface 20. The pressing block 3 can slide upward under the rebounding action of the elastic member 21, and during the lifting of the pressing block 3, the ring-shaped step surface 20 abuts against the ring-shaped flange 19, so that the initial position of the pressing block 3 on the cover body 1 can be accurately positioned, and the excessive sliding of the pressing block 3 in the avoiding hole 4 is prevented, so as to affect the normal use of the cup cover.

[0051] In use, the user applies a driving force to the pressing block 3 to make the pressing block 3 slide downward, drives the first pushing block 5 to move downward, and transmits the driving force to the driven part 702 through the extrusion of the first inclined surface 6 on the first contact part 8, so that the first pushing block 5 can drive the clamping piece 7 to move outward, and at the same time, the pressing block 3 extrudes the mounting disc 10 downward, the ring-shaped protrusion 17 abuts against the ring-shaped groove 18, and the elastic member 21 is forced to compress, so that the second pushing block 11 also moves downward until the clamping hook 701 releases the locking action on the cup cover, and the user can take down the cup cover; the user removes the force applied to the pressing block 3, and the elastic member 21 rebounds upward to reset, so that the mounting disc 10 moves upward, drives the second pushing block 11 to move upward, transmits the driving force to the driven part 702 through the extrusion of the second inclined surface 12 on the second contact part 9, so that the second pushing block 11 can drive the clamping piece 7 to move inward, and at the same time, the mounting disc 10 extrudes the pressing block 3 upward, so that the first pushing block 5 also moves upward, so that the clamping hook 701 can lock the cup cover, and when the ring-shaped flange 19 abuts against the ring-shaped step surface 20, the pressing block 3 slides to the initial position on the cover body 1.

[0052] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made according to the utility model specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A push-to-unlock cup lid, comprising a lid body (1) and a mounting base (2) connected to each other, characterized in that: Further include pressing block (3), the pressing block (3) and the cover (1) sliding connection, the cover (1) is provided with the avoiding hole (4) for the pressing block (3) passes through, the pressing block (3) bottom is provided with first push block (5), first push block (5) is provided with first inclined plane (6), the mounting seat (2) is provided with the transverse sliding clamping piece (7), the clamping piece (7) includes hook (701) and driven part (702) connected with each other, the driven part (702) is provided with first contact part (8), the first inclined plane (6) extrudes the first contact part (8), the first push block (5) can push the clamping piece (7) and move outward;The mounting seat (2) is further provided with mounting disc (10), the pressing block (3) and the mounting disc (10) are attached, the mounting disc (10) and the mounting seat (2) are in contact with elastic element (21) jointly, the mounting disc (10) is provided with second push block (11), the second push block (11) is provided with second inclined plane (12), the driven part (702) is further provided with second contact part (9), the second inclined plane (12) extrudes the second contact part (9), the second push block (11) can push the clamping piece (7) and move inward.

2. A push-to-pull, unlockable cup lid according to claim 1, wherein: The driven part (702) is provided with first connecting port (13), the first contact part (8) is arranged in the first connecting port (13), and the first push block (5) is always located in the first connecting port (13).

3. A push-to-pull, unlockable cup lid according to claim 2, wherein: The first contact part (8) is inclined, the first inclined plane (6) is inclined downward, the first contact part (8) is inclined upward, and the first inclined plane (6) and the first contact part (8) are in contact.

4. A push-to-pull, unlockable cup lid as defined in claim 3, wherein: The driven part (702) is provided with second connecting port (14), the second contact part (9) is arranged in the second connecting port (14), and the second push block (11) is always located in the second connecting port (14).

5. A push-to-pull, unlockable cup lid as defined in claim 4, wherein: The second contact part (9) is inclined, the second inclined plane (12) is inclined upward, the second contact part (9) is inclined downward, and the second inclined plane (12) and the second contact part (9) are in contact.

6. A push-to-pull, unlockable cup lid as claimed in claim 1 or 2 or 3 or 4 or 5, wherein: The mounting seat (2) is further provided with detachable positioning block (15), the positioning block (15) is located above the clamping piece (7) and the clamping piece (7) is limited by the positioning block (15).

7. A push-to-pull, unlockable cup lid as defined in claim 6, wherein: The mounting seat (2) is provided with limiting gap (16), the limiting gap (16) is located above the driven part (702), the positioning block (15) is sheet-shaped, and the positioning block (15) is clamped in the limiting gap (16).

8. A push-to-pull, unlockable cup lid according to claim 7, wherein: The bottom of the pressing block (3) is provided with an annular protrusion (17), and the mounting disc (10) is correspondingly provided with an annular groove (18), and the annular protrusion (17) and the annular groove (18) are embedded.

9. A push to open, push to close, push to lock, push to unlock cup closure according to claim 1 or 2 or 3 or 4 or 5 or 7 or 8, wherein: The bottom of the avoiding hole (4) is provided with a ring-shaped flange (19), and the outer sidewall of the pressing block (3) is provided with a ring-shaped step surface (20), and the ring-shaped flange (19) can abut against the ring-shaped step surface (20).