An apparatus for manufacturing a medical cable

Abstract

The application relates to the technical field of cable manufacturing devices, and provides a manufacturing device for medical cables, which comprises a base horizontally arranged, a wire core vertically penetrating a hole in the middle of the base, an outer layer wire conveying element rotatably arranged above the base and used for conveying an outer layer wire to the outer side of the wire core to form an outer layer on the outer periphery of the wire core, a lifting device arranged above the base, and a loose-tight forming element connected with the lifting device, the loose-tight forming element being partially arranged between the wire core and the outer layer, and the lifting device periodically driving the loose-tight forming element to lift, so that the size of the gap between the wire core and the braided layer is controlled by lifting the loose-tight forming element, and tight parts and loose parts are formed in the outer layer. The manufacturing device can form tight parts and loose parts in the outer layer of the cable, can improve the bending resistance of the cable, and prolongs the service life of the cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable manufacturing devices, in particular to the technical field of medical cable manufacturing devices. BACKGROUND

[0002] Medical cables play a crucial role in medical equipment, connecting various components of the equipment, ensuring accurate data transmission and stable power supply. Medical cables have a wide range of applications, including high-end imaging equipment such as CT scanners, MRI machines, endoscopes, etc.

[0003] In particular, the cable of the endoscope has higher requirements and is difficult to manufacture.

[0004] In the prior art, the endoscope cable is operated by a doctor and needs to be constantly bent during use. After long-term bending, the cable is prone to breakage, resulting in signal transmission damage or even interruption, so it is necessary to improve the bending resistance of the existing cable to improve the service life of the endoscope cable. SUMMARY

[0005] The purpose of the present application is to provide a medical cable manufacturing device to solve the problem of endoscope cable breakage after long-term bending.

[0006] In order to achieve the above purpose, the present application realizes the following technical scheme:

[0007] A medical cable manufacturing device is provided, the cable comprising a core and an outer layer wrapped around the outer periphery of the core, the outer layer comprising tight and loose sections arranged periodically along the extension direction of the core, comprising:

[0008] A base is provided, the base is horizontally arranged, and the core vertically passes through the hole in the middle of the base;

[0009] An outer layer wire conveying member is provided, the outer layer wire conveying member is rotatably arranged above the base, for conveying the outer layer wire to the outer side of the core to form the outer layer around the core;

[0010] A lifting device is provided, the lifting device is arranged above the base;

[0011] A tight and loose forming member is provided, the tight and loose forming member is connected with the lifting device, the tight and loose forming member is partially arranged between the core and the outer layer, and the lifting device periodically drives the tight and loose forming member to lift, the size of the gap between the core and the braided layer is controlled by lifting the tight and loose forming member, so as to form the tight and loose sections in the outer layer.

[0012] Further, the tightness forming piece comprises a base, a limiting ring and a baffle, the limiting ring is arranged above the base, the baffle is arranged above the limiting ring, and the baffle is configured to be at least partially periodically inserted between the core and the outer layer to adjust the gap between the core and the outer layer.

[0013] Further, the baffle is a long strip-shaped plate, the width direction of the baffle is arc-shaped, and the arc-shaped baffle is matched with the outer wall of the core.

[0014] Further, the baffle comprises an upper segment and a lower segment, the upper segment is arranged above the lower segment, and the thickness of the upper segment is smaller than the thickness of the lower segment.

[0015] Further, the baffle further comprises a transition segment arranged between the upper segment and the lower segment, and the transition segment is a slope surface extending from the lower segment to the upper segment.

[0016] Further, the lifting device comprises a fixed ring, an elastic member and a rotating member.

[0017] The fixed ring is arranged on the base, and the base of the tightness forming piece is arranged in the ring of the fixed ring.

[0018] The elastic member is arranged between the base and the base, and the elastic member is configured to provide an upward force to the base.

[0019] The rotating member is used to drive the base to periodically move downward relative to the fixed ring.

[0020] Further, the base is a concave shape, the outer side of the side wall of the concave shape is provided with a vertically extending rack, the rotating member comprises an incomplete gear and a driving member for driving the rotation of the incomplete gear, and the incomplete gear is matched with the rack to realize the driving of the base to periodically move downward relative to the fixed ring.

[0021] Further, the elastic member is a spring, the inner side of the side wall of the concave shape is provided with an annular groove opening downward, the upper end of the spring is arranged in the annular groove, and the lower end of the spring is arranged on the upper surface of the base.

[0022] Further, the fixed ring is a C-shaped ring, and the rotating member is arranged at the gap of the C-shaped ring.

[0023] Further, the lifting device further comprises a guide device, the guide device comprises a strip-shaped groove and a protrusion matched therewith, the strip-shaped groove is arranged on the inner side of the side wall of the C-shaped ring and extends vertically, and the protrusion is arranged on the outer side of the side wall of the concave shape.

[0024] Further, a sizing member is connected to the base through a support, the sizing member is arranged above the tight and loose forming member, the cable passes through the sizing hole of the sizing member, and the outer layer is formed below the sizing hole to form the outer layer.

[0025] Further, an annular protruding lip is arranged around the lower part of the sizing hole of the sizing member.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] The cable provided by the present application has tight and loose parts, and the tight and loose parts are formed by the lifting of the tight and loose forming member, which avoids the breakage caused by long-time bending and improves the service life of the cable, and the cable has certain support property and avoids being too loose. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the description will be briefly introduced as follows. Obviously, the drawings in the following description are one embodiment of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings:

[0029] Figure 1 The structure schematic diagram of the medical cable manufacturing device provided by the present application is shown in the figure;

[0030] Figure 2 The structure schematic diagram of the cable provided by the present application is shown in the figure;

[0031] Figure 3 The structure schematic diagram of the tight and loose forming member provided by the present application is shown in the figure;

[0032] Figure 4 The structure schematic diagram of the tight and loose forming member and the lifting device provided by the present application is shown in the figure;

[0033] Figure 5 The top view of the tight and loose forming member and the lifting device provided by the present application is shown in the figure;

[0034] Figure 6 The structure schematic diagram of the sizing member provided by the present application is shown in the figure;

[0035] Figure 7 The side view of the baffle of the tight and loose forming member provided by the present application is shown in the figure;

[0036] Figure 8 The structure schematic diagram of the tight part of the cable manufactured by the sizing member and the baffle provided by the present application is shown in the figure;

[0037] Figure 9 The structure schematic diagram of the loose part of the cable manufactured by the sizing member and the baffle provided by the present application is shown in the figure.

[0038] The reference signs in the drawings are:

[0039] The core 201, the outer layer 202, the tight part 210, the sparse part 220, the base 110, the outer layer wire conveying member 102, the roller 106, the tight-sparse forming member 130, the support 140, the wire conveying roller 103, the lower roller 104, the locking screw 141, the convex lip 121, the base 131, the limiting ring 132, the baffle 134, the fan-shaped inclined surface 133, the fixing ring 111, the elastic member 115, the rotating member 113, the strip-shaped groove 112, the incomplete gear 114, the annular vertical plate 135, the annular groove 136, the protrusion 137, the gear rack 138, the diameter fixing member 120, the positioning ring 122, the diameter fixing hole 123, the upper section 1341, the lower section 1343, and the transition section 1342. DETAILED DESCRIPTION

[0040] The scheme provided by the present application is further described in detail below in combination with the drawings and the specific embodiments. The advantages and features of the present application will be more apparent according to the following description. It should be noted that the drawings are greatly simplified and all use non-precise proportions, only for the purpose of facilitating and clearly assisting the description of the embodiments of the present application. In order to make the purpose, features and advantages of the present application more apparent and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the conditions for implementing the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0041] Figure 1 A schematic diagram of a medical cable manufacturing device provided by the present application is shown, Figure 2 A schematic diagram of the structure of the cable is shown, Figures 1-2 As shown, the medical cable manufacturing device is used to manufacture a cable, which includes a core 201 and an outer layer 202 wrapped around the outer periphery of the core 201. The outer layer 202 is wrapped around the outer periphery of the core 201 by weaving, and the outer layer 202 includes tight parts 210 and sparse parts 220 arranged periodically along the extension direction of the core 201; by Figure 2It can be seen that there is a gap between the sparse part 220 and the core 201, so that when the cable is bent, the problem of easy breakage of the outer layer 202 and the core 201 due to close fitting is solved, and the problem of easy breakage of the woven outer layer 202 due to mutual stretching and extrusion is avoided. In addition, the gap between the tight part 210 and the core 201 is small or non-existent, which has the advantage of providing a certain support between the core 201 and the outer layer 202, avoiding too loose cable. Therefore, the periodically arranged tight part 210 and sparse part 220 are beneficial to the extension of the service life of the cable.

[0042] In order to form the tight part 210 and the sparse part 220 on the outer layer 202, the application provides a medical cable manufacturing device, as shown in Figure 1 It comprises a base 110, an outer layer wire conveying member 102, a lifting device, a roller 106 and a tight and sparse forming member 130.

[0043] The roller 106 is arranged directly above the base 110, the base 110 is horizontally arranged, the base 110 is supported by a supporting leg, a hole (not shown in the figure) is arranged in the middle of the base 110, the core 201 vertically passes through the hole in the middle of the base 110, and the roller 106 provides power for conveying the cable, which is conveyed from bottom to top. The lower roller 104 is arranged directly below the base, the core 201 is pulled upwards by the roller 106, and the lower roller 104 guides the formation of the cable conveyed from bottom to top.

[0044] The outer layer wire conveying member 102 is rotatably arranged above the base 110, and is used to convey the outer layer wire to the outside of the core 201 to form the outer layer 202 on the outer periphery of the core 201. Specifically, the outer layer wire conveying member 102 is annular, a plurality of wire conveying rollers 103 are uniformly and spacedly arranged on the upper surface of the annular outer layer wire conveying member 102, and a plurality of outer layer wires are conveyed. The center of the annular outer layer wire conveying member 102 is provided with a circular opening.

[0045] The lifting device is arranged above the base 110 and around the hole of the base 110.

[0046] The tight and sparse forming member 130 is connected with the lifting device and is also arranged above the base 110, the tight and sparse forming member 130 is partially arranged between the core 201 and the outer layer 202, the lifting device periodically drives the tight and sparse forming member 130 to lift, and the size of the gap between the core 201 and the woven layer is controlled by lifting the tight and sparse forming member 130, so as to form the tight part 210 and the sparse part 220 on the outer layer 202. Specifically, the lifting device and the tight and sparse forming member 130 are arranged at the circular opening in the center of the outer layer wire conveying member 102 and pass through the circular opening. The circular opening is much larger than the hole of the base 110.

[0047] The manufacturing apparatus further includes a sizing member 120 and a bracket 140. Both the sizing member 120 and the roller 106 are connected and fixed to the base 110 via the bracket 140. The sizing member 120 is positioned directly above the loosening forming member 130 and directly below the roller 106. The cable vertically passes through the sizing hole 123 of the sizing member 120. The outer layer wire forms an outer layer region S below the sizing hole 123 (e.g., ...). Figure 9 As shown, the outer layer 202 is formed by wrapping the core 201.

[0048] Figure 6 A schematic diagram of the sizing component is shown, such as... Figure 6 As shown, the sizing component 120 includes a cylindrical body, a positioning ring 122, and a convex lip 121. The positioning ring 122 is disposed above the outer periphery of the cylindrical body. A sizing hole 123 is disposed at the center of the cylindrical body, extending vertically upwards and downwards. An annular convex lip 121 is disposed around the lower periphery of the sizing hole 123. The outer layer wire wraps around the core 201 in the outer layer forming area S below the sizing hole 123 to form the outer layer 202. The manufactured cable is conveyed vertically upwards through the sizing hole 123. When the outer layer wire is braided in the outer layer forming area S, the convex lip 121 can effectively protect the outer layer wire that converges here, preventing it from being cut, because the outer layer wire has a large angle relative to the vertical direction. The bracket 140 includes a sizing member 120 fixing plate and a locking screw 141. The sizing member 120 fixing plate is horizontally arranged and has a vertical T-shaped through hole. The inner contour of the T-shaped through hole is adapted to the outer contour of the sizing member 120. The sizing member 120 is disposed in the T-shaped through hole. The locking screw 141 is threaded from the side of the sizing member 120 fixing plate to the T-shaped through hole to fix the sizing member 120.

[0049] Figure 3 A schematic diagram of the structure of the loosening forming element is shown, such as Figure 3 As shown, the tensioning forming member 130 includes a base 131, a limiting ring 132, and a baffle 134. The limiting ring 132 is disposed above the base 131, and the baffle 134 is disposed above the limiting ring 132. The baffle 134 is configured to be inserted at least partially and periodically between the wire core 201 and the outer layer 202 to adjust the gap between the wire core 201 and the outer layer 202. The base 131 is generally a flattened cylinder with an inverted concave cross-section. The limiting ring 132 is annular, communicating with and concentrically positioned with the base 131. The wire core 201 passes through the base 131 first, then through the limiting ring 132. The through-hole in the center of the limiting ring 132 is used to constrain the passing wire core 201. Preferably, the diameter of the base 131 is larger than the diameter of the limiting ring 132.

[0050] Preferably, the loose-tight forming member 130 further comprises a fan-shaped slope 133, which is arranged between the limiting ring 132 and the baffle 134, and which is inclined towards the wire core 201. The fan-shaped slope 133 is used to prevent the outer layer wire from being stuck, while avoiding the outer layer wire from being cut.

[0051] The baffle 134 is a vertically extending long strip-shaped plate, the width direction of which is arc-shaped, and the arc-shaped plate is adapted to the outer wall of the wire core 201 to prevent the outer layer wire from being cut. The inner surface of the long strip-shaped plate close to the wire core 201 is parallel to the outer wall of the wire core 201. Preferably, the arc-shaped plate in the width direction only circumferentially surrounds less than 1 / 3 of the circumference of the wire core 201. The baffle 134 comprises an upper section 1341 and a lower section 1343, the upper section 1341 is arranged above the lower section 1343, and the top end surface of the upper section 1341 is arc-shaped, so as to facilitate the movement of the baffle 134 between the wire core 201 and the outer layer 202 without cutting the outer layer wire.

[0052] In some embodiments, the thickness of the upper section 1341 and the lower section 1343 of the baffle 134 is equal, as shown in Figure 3 In this embodiment, the baffle 134 is configured to be at least partially periodically inserted between the wire core 201 and the outer layer 202 to adjust the gap between the wire core 201 and the outer layer. Specifically, in the loose portion 220 forming stage, the lifting device drives the whole loose-tight forming member 130 to move upward, and the baffle 134 is inserted between the wire core 201 and the outer layer 202. The top end surface of the upper section 1341 of the baffle 134 passes through the sizing hole 123 of the sizing member 120 upward until it exceeds the upper surface of the sizing member 120. In this stage, due to the effect of the baffle 134, there is a larger gap between the wire core 201 and the outer layer 202, and finally the loose portion 220 is formed.

[0053] Subsequently, the lifting device drives the whole loose-tight forming member 130 to move downward, and when the top end surface of the upper section 1341 of the baffle 134 moves downward below the outer layer forming area S, it enters the tight portion 210 forming stage. In this stage, since the baffle 134 is not between the wire core 201 and the outer layer 202, there is no gap between the wire core 201 and the outer layer 202, and finally the tight portion 210 is formed. By repeating the above two stages, the periodic tight portion 210 and loose portion 220 of the outer layer can be formed.

[0054] Figures 7-9 Another embodiment of the loose-tight forming member is shown in Figures 7-9As shown, optionally, the thickness of the outer surface of the upper section 1341 of the baffle of the sparse-tight forming piece 130 is less than the thickness of the outer surface of the lower section 1343, the baffle 134 further comprises a transition section 1342, which is arranged between the upper section 1341 and the lower section 1343, and the transition section 1342 is a slope surface extending from the lower section 1343 to the upper section 1341. That is, the baffle 134 is stepped near the outer surface of the wire core 201.

[0055] In this embodiment, in the sparse portion 220 forming stage (as shown in Figure 9 As shown, the lifting device drives the sparse-tight forming piece 130 to move upward as a whole, the baffle 134 is inserted between the wire core 201 and the outer layer 202, the top end of the upper section 1341 of the baffle 134 passes through the sizing hole 123 of the sizing piece 120 upward until it exceeds the upper surface of the sizing piece 120, at this stage, the lower section 1343 of the baffle 134 is always in the outer layer forming area S, so that there is a large gap between the wire core 201 and the outer layer 202, and finally the sparse portion 220 is formed. Subsequently, the lifting device drives the sparse-tight forming piece 130 to move downward as a whole, when the upper section 1341 of the baffle 134 enters the outer layer forming area S, it enters the tight portion 210 forming stage (as shown in Figure 8 As shown, the lifting device drives the sparse-tight forming piece 130 to move upward as a whole, the baffle 134 is inserted between the wire core 201 and the outer layer 202, the top end of the upper section 1341 of the baffle 134 passes through the sizing hole 123 of the sizing piece 120 upward until it exceeds the upper surface of the sizing piece 120, at this stage, the lower section 1343 of the baffle 134 is always in the outer layer forming area S, so that there is a large gap between the wire core 201 and the outer layer 202, and finally the sparse portion 220 is formed. Subsequently, the lifting device drives the sparse-tight forming piece 130 to move downward as a whole, when the upper section 1341 of the baffle 134 enters the outer layer forming area S, it enters the tight portion 210 forming stage (as shown in

[0056] Figures 4-5 The structure of the sparse-tight forming piece and the lifting device is shown in the schematic diagram, as shown in Figures 4-5 The lifting device comprises a fixed ring 111, an elastic member 115 and a rotating member 113; the fixed ring 111 is arranged above the base 110 and surrounds the hole of the base 110, and the base 131 of the sparse-tight forming piece 130 is arranged in the ring of the fixed ring 111; preferably, the diameter of the base 131 is slightly larger than the diameter of the hole of the base 110, and the diameter of the hole of the base 110 is slightly larger than the diameter of the wire core 201, so that the wire core 201 can pass through. The elastic member 115 is arranged between the base 110 and the base 131, and the elastic member 115 is configured to provide an upward force to the base 131. The rotating member 113 is used to drive the base 131 to move downward periodically relative to the fixed ring 111.

[0057] Optionally, the base 131 is concave, and a vertically extending rack 138 is provided on the outer side of the concave sidewall. The rotating member 113 includes an incomplete gear 114 and a driving member that drives it to rotate. The incomplete gear 114 cooperates with the rack 138 to drive the base 131 to move downward periodically relative to the fixed ring 111.

[0058] The elastic element 115 is a spring. An annular vertical plate 135 is provided inside the concave sidewall to provide an annular groove 136 with an opening facing downward inside the concave sidewall. The upper end of the spring is provided in the annular groove 136, and the lower end of the spring is provided on the upper surface of the base 110.

[0059] Preferably, the fixed ring 111 is a C-shaped ring, and the rotating member 113 is disposed at the notch of the C-shaped ring. The lifting device further includes a guide device, which includes a strip groove 112 and a cooperating protrusion 137. The strip groove 112 is disposed on the inner side of the side wall of the C-shaped ring and extends vertically; the protrusion 137 is disposed on the outer side of the inverted concave side wall.

[0060] by Figure 4 As shown in the example, the rotating member 113 rotates counterclockwise, and the toothed part of the incomplete gear 114 engages with the rack 138, driving the base 131 to move downward. When the toothless part of the incomplete gear 114 rotates to the position of the rack 138, the base 131 cannot continue to move downward due to the absence of teeth. At this time, the upward force of the spring drives the base 131 to move upward. Due to the presence of the guide device, the base 131 is only limited to moving in a fixed position. The lifting and lowering time can be adjusted according to the ratio of the toothed and toothless parts of the incomplete gear 114 and the rotational speed of the rotating member 113, thereby adjusting the formation time of the tight part 210 and the loose part 220.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] While the application has been described in detail and with reference to specific preferred embodiments thereof, it will be apparent to one skilled in the art that various modifications and alternatives can be employed without departing from the spirit and scope of the application. Accordingly, the scope of the application should be determined by the appended claims and their equivalents.

Claims

1. An apparatus for manufacturing a medical cable, the cable including a core and an outer layer wrapped around an outer circumference of the core, the outer layer including tight portions and sparse portions periodically arranged along an extension direction of the core, characterized in that, The application relates to a cable manufacturing device, which comprises a base, an outer layer wire conveying element, a lifting device and a loose-tight forming element. The base is horizontally arranged, and the core wire vertically passes through a hole in the middle of the base. The outer layer wire conveying element is rotatably arranged above the base and used for conveying outer layer wires to the outside of the core wire to form an outer layer on the periphery of the core wire. The lifting device is arranged above the base. The loose-tight forming element is connected with the lifting device and is partially arranged between the core wire and the outer layer. The lifting device periodically drives the loose-tight forming element to lift and control the gap size between the core wire and the braided layer to form tight and loose parts on the outer layer. The loose-tight forming element comprises a base, a limiting ring and a baffle.

2. The apparatus for manufacturing a medical cable according to claim 1, wherein The limiting ring is arranged above the base, and the baffle is arranged above the limiting ring.

3. The apparatus according to claim 2, wherein The baffle is configured to be at least partially periodically inserted between the core wire and the outer layer to adjust the gap between the core wire and the outer layer.

4. The apparatus according to claim 3, wherein The device further comprises a diameter forming element connected with the base through a support.

5. The apparatus for manufacturing a medical cable according to claim 1, wherein The diameter forming element is arranged above the loose-tight forming element. The cable passes through a diameter hole of the diameter forming element. The outer layer wire wraps the core wire in the outer layer forming area below the diameter hole to form the outer layer. The baffle is a long strip-shaped plate.

6. The apparatus according to claim 5, wherein the first and second conductors are formed by a single wire. The width direction of the baffle is arc-shaped.

7. The apparatus according to claim 6, wherein the plurality of conductors are arranged in a plurality of layers. The arc-shaped baffle is matched with the outer wall of the core wire.

8. The apparatus according to claim 7, wherein the plurality of conductors are arranged in a plurality of layers. The baffle comprises an upper segment and a lower segment.

9. The apparatus according to claim 8, wherein the plurality of conductors are arranged in a plurality of layers. The upper segment is arranged above the lower segment.

10. The apparatus according to claim 1, wherein The thickness of the upper segment is smaller than that of the lower segment. The baffle further comprises a transition segment arranged between the upper segment and the lower segment. The transition segment is a slope surface extending from the lower segment to the upper segment. The lifting device comprises a fixed ring, an elastic element and a rotating element. The fixed ring is arranged on the base. The base of the loose-tight forming element is arranged in the ring of the fixed ring. The elastic element is arranged between the base and the base. The elastic element is configured to provide upward force to the base. The rotating element is used for periodically driving the base to move downward relative to the fixed ring. The base is inversely concave-shaped. The outer side of the side wall of the inversely concave-shaped base is provided with a vertically extending rack. The rotating element comprises an incomplete gear and a driving element for driving the rotating element to rotate. The incomplete gear is matched with the rack to realize the periodic downward movement of the base relative to the fixed ring. The elastic element is a spring. The inner side of the side wall of the inversely concave-shaped base is provided with a downwardly opening annular groove. The upper end of the spring is arranged in the annular groove. The lower end of the spring is arranged on the upper surface of the base. The fixed ring is a C-shaped ring. The rotating element is arranged at the gap of the C-shaped ring. The lifting device further comprises a guide device. The guide device comprises a strip-shaped groove and a protrusion matched with the strip-shaped groove. The strip-shaped groove is arranged on the inner side of the side wall of the C-shaped ring and vertically extends. The protrusion is arranged on the outer side of the side wall of the inversely concave-shaped base. An annular convex lip is arranged around the lower side of the diameter hole of the diameter forming element.

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