Anti-separation type cold contraction cable accessory

Abstract

The invention discloses an anti-separation type cold shrinkage cable accessory in the technical field of cable accessories. The anti-separation type cold shrinkage cable accessory comprises a sleeve main body, a clamping assembly, a sliding sleeve and a tightening assembly, the sleeve main body sleeves the outer side of the cold shrink tube, and the clamping assembly is arranged in the sleeve main body and is used for clamping or loosening the cold shrink tube; the sliding sleeves are rotationally arranged on the two sides of the sleeve body, and the tightening assemblies are arranged in the sliding sleeves and used for applying pressure to a cold shrink pipe. And the clamping assembly is matched with the tightening assembly to prevent the port separation between the cold shrink tube and the cable. The contact rod in the tightening assembly continuously applies radial pressure to the port of the cold shrink tube under the action of the compression spring, so that long-term tight attachment of the port and the cable outer sheath is ensured, the risk of external moisture infiltration is reduced, and the hidden danger of short circuit is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of cable accessories, specifically to a type of anti-separation cold-shrink cable accessory. Background Technology

[0002] Cold shrink cable accessories are devices commonly used for connecting, sealing, and insulating power cables. Their main body is typically made of highly elastic and weather-resistant silicone rubber, and is expanded at the factory using built-in supports. During installation, the supports are placed in the predetermined position outside the cable, and then pulled out. The cold shrink tubing automatically tightens under the material's retraction, tightly wrapping around the cable's outer surface to form a seal and provide insulation protection.

[0003] Existing cold-shrink cable accessories can achieve a relatively tight fit during initial installation. However, during long-term operation, due to factors such as changes in ambient temperature, material aging, and mechanical vibration, the tightness of the fit between the cold-shrink tubing's port and the cable's outer sheath gradually decreases. When a tiny gap appears at the port, external moisture, humidity, or contaminants may enter the accessory through the gap, causing dampness at the cable joint and increasing the risk of insulation breakdown and short circuits.

[0004] To improve this problem, some technical solutions add auxiliary fixing methods such as adhesives, cable ties or heat shrink tubing at the port. However, these methods have drawbacks such as cumbersome construction, poor repeatability or weakened adhesive performance after high-temperature aging, making it difficult to maintain the sealing performance of the port effectively in the long term. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-separation cold shrink cable accessory to solve the problem mentioned in the background art where the port of the cold shrink cable accessory loosens and separates due to elastic decay during long-term use, and the sealing performance deteriorates, leading to water ingress.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an anti-separation cold shrink cable accessory, comprising a sleeve body, a snap-fit ​​assembly, a sliding sleeve, and a tightening assembly; the sleeve body is sleeved on the outside of the cold shrink tube, the snap-fit ​​assembly is disposed in the sleeve body for clamping or loosening the cold shrink tube; the sliding sleeve is rotatably disposed on both sides of the sleeve body, and the tightening assembly is disposed inside the sliding sleeve and is used to apply pressure to the cold shrink tube; the snap-fit ​​assembly cooperates with the tightening assembly to prevent separation of the cold shrink tube from the cable at the port.

[0007] Preferably, the snap-fit ​​assembly includes a snap-fit ​​cavity rotatably disposed in the sleeve body and a rotating block rotatably disposed in the snap-fit ​​cavity. The snap-fit ​​cavity has a rotating groove on its side, and a rotating rod is fixedly disposed on the rotating block, passing through the rotating groove. The snap-fit ​​cavity has an inclined groove on its side wall, and the rotating block has a sliding groove on its side wall. Multiple snap-fit ​​teeth are disposed between the snap-fit ​​cavity and the rotating block. Sliding protrusions are respectively disposed on both sides of the snap-fit ​​teeth and are placed in the inclined groove and the sliding groove respectively. By rotating the rotating rod, the rotating block is driven to rotate, so that the multiple snap-fit ​​teeth can clamp or release the cold shrink tubing.

[0008] Preferably, the tightening assembly includes a plurality of tightening elements arranged circumferentially in a sliding sleeve.

[0009] Preferably, the tightening component includes: a sliding track disposed within the sliding sleeve; a convex mounting block disposed at one end of the sliding track; a mounting groove formed within the convex mounting block; and a rotating knob disposed outside the convex mounting block. A rotating gear and two residual gears are rotatably disposed within the mounting groove. The two residual gears mesh with the rotating gear, and each residual gear has a protruding block. The rotating gear is connected to the rotating knob. A sliding block is slidably disposed on the sliding track, and the sliding block abuts against the mounting block to form an insertion space. A contact rod is slidably disposed on the other side of the sliding block, and a compression spring is provided between the contact rod and the sliding block. The end of the contact rod abuts against the cold shrink tubing. The protruding block can enter through the insertion space and push out the sliding block, thereby pushing the contact rod against the cold shrink tubing for tightening.

[0010] Preferably, the tightening component further includes a one-way snap-fit ​​connector disposed between the sliding block and the sliding track.

[0011] Preferably, the one-way locking component includes telescopic locking teeth disposed on both sides of the sliding block and locking strips disposed on both sides of the sliding track; the telescopic locking teeth and locking strips engage with each other to maintain a self-locking effect in a tightened state.

[0012] Preferably, the tightening component further includes a return component.

[0013] Preferably, the return component includes an upper through groove and a lower through groove formed in the sliding block, and an oblique sliding groove formed on the locking teeth; a sliding crank is slidably arranged in the upper through groove, the lower through groove and the oblique sliding groove, and a baffle that can abut against the protruding block is provided below the sliding crank; when the sliding crank moves downward, it drives its inclined surface to slide along the oblique sliding groove, causing the locking teeth to retract backward to release the self-locking, thereby causing the sliding block to move backward and reset under the action of elastic force.

[0014] Preferably, the end of the protruding block closest to the insertion space is smaller than the other end, so that the protruding block can smoothly enter the insertion space and push out the sliding block.

[0015] Preferably, the side of the protruding block that contacts the sliding block has an arc surface.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The contact rod inside the tightening assembly continuously applies radial pressure to the cold shrink tube port under the action of the compression spring, ensuring that the port is in close contact with the cable outer sheath for a long time, reducing the risk of external moisture infiltration and reducing the risk of short circuit.

[0017] 2. The tightening assembly uses multiple tightening parts distributed in a circumferential array to achieve uniform compression, avoiding localized force concentration that could cause deformation or damage to the cold shrink tubing material and extending its service life.

[0018] 3. It is equipped with a release mechanism, which can release the locking and tightening state when needed, so as to realize the quick disassembly and reset of accessories, which facilitates subsequent maintenance or replacement.

[0019] 4. The sliding sleeve is rotatably mounted on both sides of the sleeve body, which can be adjusted during installation according to different lengths of cold shrink tubing, enhancing versatility and adaptability.

[0020] 5. Tightening or loosening is achieved by rotating the knob to drive the gear mechanism. The structure and operation are intuitive, the on-site construction efficiency is high, and the clamping force is controllable. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the structure at point A; Figure 3 This is a schematic diagram of the snap-fit ​​assembly of the present invention; Figure 4 This is an exploded view of the snap-fit ​​assembly of the present invention; Figure 5 This is a side view of the structure of the present invention; Figure 6 This is a schematic diagram of the tightening component structure of the present invention; Figure 7 This is an internal view of the tightening component structure of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the structure at point B.

[0023] The attached diagram lists the components represented by each number as follows: Sleeve body 100, snap-fit ​​assembly 101, snap-fit ​​cavity 102a, rotating block 102b, rotating groove 102c, rotating rod 102d, inclined groove 102e, sliding groove 102f, snap-fit ​​tooth 102g, sliding protrusion 102h, sliding sleeve 103, tightening assembly 104, tightening piece 104a, sliding track 104a-1, convex mounting block 104a-2, mounting groove 104a-3, rotating knob 104a-4, rotation Moving gear 104a-5, residual gear 104a-6, protruding block 104a-7, sliding block 104a-8, contact rod 104a-9, compression spring 104a-10, one-way snap-fit ​​part 104b, telescopic snap-fit ​​tooth 104b-1, snap-fit ​​bar 104b-2, return part 104c, upper through groove 104c-1, lower through groove 104c-2, inclined slide groove 104c-3, sliding crank 104c-4, baffle 104c-5. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1-8 This invention provides a technical solution: an anti-separation cold shrink cable accessory, comprising a sleeve body 100, a snap-fit ​​assembly 101, a sliding sleeve 103, and a tightening assembly 104; the sleeve body 100 is sleeved on the outside of the cold shrink tube, the snap-fit ​​assembly 101 is disposed in the sleeve body 100 for clamping or loosening the cold shrink tube; the sliding sleeve 103 is rotatably disposed on both sides of the sleeve body 100, and the tightening assembly 104 is disposed inside the sliding sleeve 103 for applying pressure to the cold shrink tube; the snap-fit ​​assembly 101 and the tightening assembly 104 cooperate to prevent the port of the cold shrink tube from separating from the cable. In this embodiment: this invention provides an anti-separation cold shrink cable accessory, comprising a sleeve body 100, a snap-fit ​​assembly 101, a sliding sleeve 103, and a tightening assembly 104. The sleeve body 100 is fitted onto the outside of the cold shrink tubing, serving as the overall load-bearing and support structure. Both ends of the sleeve body 100 are provided with outwardly protruding snap rings for mutual positioning with the sliding sleeve 103. The sliding sleeve 103 is rotatably mounted between the two ends of the sleeve body 100, with an inwardly protruding snap ring at one end and a blocking block fixed in the middle, allowing the sliding sleeve 103 to slide back and forth between the two ends of the sleeve body 100.

[0026] The snap-fit ​​assembly 101 includes a snap-fit ​​cavity 102a rotatably disposed in the sleeve body 100 and a rotating block 102b rotatably disposed in the snap-fit ​​cavity 102a. A rotating groove 102c is formed on the side of the snap-fit ​​cavity 102a. A rotating rod 102d is fixedly disposed on the rotating block 102b and passes through the rotating groove 102c. An inclined groove 102e is formed on the side wall of the snap-fit ​​cavity 102a and a sliding groove 102f is formed on the side wall of the rotating block 102b. Multiple snap-fit ​​teeth 102g are disposed between the snap-fit ​​cavity and the rotating block 102b. Sliding protrusions 102h are respectively provided on both sides of the snap-fit ​​teeth 102g and are respectively placed in the inclined groove 102e and the sliding groove 102f. By rotating the rotating rod 102d, the rotating block 102b is rotated, so that the multiple snap-fit ​​teeth 102g can clamp or release the cold shrink tube. The snap-fit ​​assembly 101 is fixedly installed inside the sleeve body 100 and is used to clamp or release the cold shrink tubing. This assembly includes a fixed snap-fit ​​block and a snap-fit ​​cavity within the snap-fit ​​block. A rotating block 102b is rotatably mounted inside the snap-fit ​​cavity. The rotating block 102b has a hollow structure, allowing the cold shrink tubing to pass through. A rotating groove 102c is formed on the side wall of the snap-fit ​​block. A rotating rod 102d is fixed on the rotating block 102b, passing through the rotating groove 102c for operation. An inclined groove 102e is formed on the inner wall of the snap-fit ​​cavity, and a sliding groove 102f is formed on the side wall of the rotating block 102b. Multiple snap-fit ​​teeth 102g are distributed between the snap-fit ​​cavity and the rotating block 102b. Each snap-fit ​​tooth 102g has sliding protrusions 102h on both sides, which are respectively embedded in the inclined groove 102e and the sliding groove 102f. When the rotating rod 102d drives the rotating block 102b to rotate, the clamping teeth 102g move radially under the action of the inclined groove 102e and the sliding groove 102f, thereby achieving the clamping or loosening of the cold shrink tube.

[0027] The tightening assembly 104 includes multiple tightening members 104a arranged circumferentially in the sliding sleeve 103. Each tightening member 104a includes a sliding track 104a-1 disposed within the sliding sleeve 103, a convex mounting block 104a-2 disposed at one end of the sliding track 104a-1, a mounting groove 104a-3 formed within the convex mounting block 104a-2, and a rotating knob 104a-4 disposed outside the convex mounting block 104a-2. A rotating gear 104a-5 and two residual gears 104a-6 are rotatably disposed within the mounting groove 104a-3; the two residual gears 104a-6 mesh with the rotating gear 104a-5, and each residual gear 104a-6 has a protruding block 104a-7. The rotating gear 104a-5... 4a-5 is connected to the rotating knob 104a-4; a sliding block 104a-8 is slidably mounted on the sliding rail 104a-1, and the sliding block 104a-8 abuts against the mounting block to form an insertion space; a contact rod 104a-9 is slidably mounted on the other side of the sliding block 104a-8, and a compression spring 104a-10 is provided between the contact rod 104a-9 and the sliding block 104a-8, with the end of the contact rod 104a-9 abutting against the cold shrink tube; a protruding block 104a-7 can enter through the insertion space and push out the sliding block 104a-8, thereby pushing the contact rod 104a-9 against the cold shrink tube for fastening. The end of the protruding block 104a-7 near the insertion space is smaller than the other end, so that the protruding block 104a-7 can smoothly enter through the insertion space and push out the sliding block 104a-8. The side of the protruding block 104a-7 that contacts the sliding block 104a-8 has an arc surface. In this embodiment, the tightening assembly 104 is disposed inside the sliding sleeve 103, and multiple tightening elements 104a are arrayed along the circumference of the cold shrink tube. Each tightening element 104a includes a sliding track 104a-1, with a convex mounting block 104a-2 at one end of the track. The mounting block has a mounting groove 104a-3 inside and a rotating knob 104a-4 on the outside. A rotating gear 104a-5 is rotatably mounted in the mounting groove 104a-3, and residual gears 104a-6 that mesh with the rotating gear 104a-5 are respectively provided on both sides. The residual gears 104a-6 are provided with protruding blocks 104a-7. Rotating gear 104a-5 is fixedly connected to rotating knob 104a-4. When the knob is rotated, rotating gear 104a-5 drives two residual gears 104a-6 to rotate synchronously, causing protruding block 104a-7 to enter the insertion space formed between sliding block 104a-8 and mounting block, and pushing sliding block 104a-8 out. Sliding block 104a-8 is installed in sliding track 104a-1, with one side abutting against the mounting block and the other side connected to contact rod 104a-9. Compression spring 104a-10 is provided between contact rod 104a-9 and sliding block 104a-8, and the end of contact rod 104a-9 abuts against the outer wall of cold shrink tubing.During the process of the protruding block 104a-7 pushing out the sliding block 104a-8, the sliding block 104a-8 pushes the contact rod 104a-9 towards the cold shrink tubing, and applies continuous pressure through the compression spring 104a-10, thereby reliably clamping the cold shrink tubing to the cable connection port. To ensure smooth operation, the end of the protruding block 104a-7 near the insertion space is smaller than the other end, and its surface in contact with the sliding block 104a-8 is designed as a curved surface to facilitate smooth insertion and fit against the outer surface of the cold shrink tubing. The curved surface reduces friction and jamming during insertion, making it easier for the protruding block 104a-7 to enter through the insertion space between the sliding block 104a-8 and the mounting block, reducing operating resistance. The curved contact surface can distribute the force more evenly on the surface of the sliding block 104a-8, avoiding concentrated force at sharp corners that could cause localized wear or damage to the sliding block 104a-8.

[0028] The one-way locking component 104b includes telescopic locking teeth 104b-1 disposed on both sides of the sliding block 104a-8, and locking strips 104b-2 disposed on both sides of the sliding track 104a-1; the telescopic locking teeth 104b-1 and the locking strips 104b-2 engage with each other to maintain a self-locking effect in a tightened state. In this embodiment, to prevent loosening, the tightening assembly 104 further includes the one-way locking component 104b. This locking component includes telescopic locking teeth 104b-1 disposed on both sides of the sliding block 104a-8 and corresponding locking strips 104b-2 disposed on both sides of the sliding track 104a-1. The telescopic locking teeth 104b-1 consist of locking grooves formed on both sides of the sliding block 104a-8, locking teeth 102g slidably disposed therein, and telescopic springs disposed between the locking teeth 102g and the bottom of the grooves. The locking tooth 102g extends outward under the action of elastic force and engages with the locking strip 104b-2, thereby maintaining self-locking after the sliding block 104a-8 is pushed out, so that the tightened state can be maintained for a long time and will not loosen due to reverse slippage caused by external force.

[0029] The tightening assembly 104 also includes a return element 104c. The return element 104c includes an upper through groove 104c-1 and a lower through groove 104c-2 formed in the sliding block 104a-8, and an inclined sliding groove 104c-3 formed on the engaging tooth 102g. A sliding crank 104c-4 is slidably disposed in the upper through groove 104c-1, the lower through groove 104c-2, and the inclined sliding groove 104c-3. A baffle 104c-5 is disposed below the sliding crank 104c-4, which can abut against the protruding block 104a-7. When the sliding crank 104c-4 moves downward, it causes its inclined surface to slide along the inclined sliding groove 104c-3, causing the engaging tooth 102g to retract backward to release the self-locking mechanism, thereby causing the sliding block 104a-8 to move backward and reset under the action of elastic force. In this embodiment, the tightening assembly 104 also includes a return element 104c for unlocking. The resetting component 104c includes an upper through groove 104c-1 and a lower through groove 104c-2 formed in the sliding block 104a-8, and an inclined sliding groove 104c-3 formed in the locking tooth 102g. A sliding crank 104c-4 is slidably installed between these grooves, and a baffle 104c-5 is provided below the sliding crank 104c-4, which can abut against the protruding block 104a-7. When reset is required, the sliding crank 104c-4 moves downward, its inclined surface slides along the inclined sliding groove 104c-3, and drives the locking tooth 102g to retract backward, thereby releasing the self-locking state. Under this action, the compression spring 104a-10 returns to its extension, driving the sliding block 104a-8 to move backward, so that the tightening component 104 automatically resets, preparing for the next operation.

[0030] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cold-shrink cable accessory for preventing separation, comprising a sleeve body (100), a snap-fit ​​assembly (101), a sliding sleeve (103), and a tightening assembly (104). The sleeve body (100) is sleeved on the outside of the cold shrink tubing, and the snap-fit ​​assembly (101) is disposed in the sleeve body (100) for clamping or loosening the cold shrink tubing; The sliding sleeve (103) is rotatably disposed on both sides of the sleeve body (100), and the tightening assembly (104) is disposed inside the sliding sleeve (103) and is used to apply pressure to the cold shrink tube; The snap-fit ​​assembly (101) cooperates with the tightening assembly (104) to prevent the port between the cold shrink tubing and the cable from separating.

2. The anti-separation cold-shrink cable accessory according to claim 1, characterized in that: The snap-fit ​​assembly (101) includes a snap-fit ​​cavity (102a) rotatably disposed in the sleeve body (100) and a rotating block (102b) rotatably disposed in the snap-fit ​​cavity (102a). A rotating groove (102c) is provided on the side of the snap-fit ​​cavity (102a). A rotating rod (102d) is fixedly disposed on the rotating block (102b) and passes through the rotating groove (102c). An inclined groove (102e) is provided on the side wall of the snap-fit ​​cavity (102a), a sliding groove (102f) is provided on the side wall of the rotating block (102b), and multiple snap-fit ​​teeth (102g) are provided between the snap-fit ​​cavity (102a) and the rotating block (102b). The two sides of the snap-fit ​​tooth (102g) are respectively provided with sliding protrusions (102h), which are placed in the inclined groove (102e) and the sliding groove (102f); By rotating the rotating rod (102d), the rotating block (102b) is driven to rotate, so that multiple clamping teeth (102g) can clamp or loosen the cold shrink tube.

3. The anti-separation cold-shrink cable accessory according to claim 1, characterized in that: The tightening assembly (104) includes a plurality of tightening elements (104a) arranged in a circumferential array in the sliding sleeve (103).

4. The anti-separation cold-shrink cable accessory according to claim 3, characterized in that: The tightening component (104a) includes a sliding track (104a-1) disposed in the sliding sleeve (103), a convex mounting block (104a-2) disposed at one end of the sliding track (104a-1), a mounting groove (104a-3) opened in the convex mounting block (104a-2), and a rotating knob (104a-4) disposed on the outside of the convex mounting block (104a-2). A rotating gear (104a-5) and two residual gears (104a-6) are rotatably disposed in the mounting groove (104a-3). The two residual gears (104a-6) mesh with the rotating gear (104a-5), and the residual gears (104a-6) are provided with protruding blocks (104a-7). The rotating gear (104a-5) is connected to the rotating knob (104a-4); A sliding block (104a-8) is slidably disposed on the sliding track (104a-1). The sliding block (104a-8) abuts against the convex mounting block (104a-2) to form an insertion space. A contact rod (104a-9) is slidably provided on the other side of the sliding block (104a-8). A compression spring (104a-10) is provided between the contact rod (104a-9) and the sliding block (104a-8). The end of the contact rod (104a-9) abuts against the cold shrink tube. The protruding block (104a-7) can enter through the insertion space and push out the sliding block (104a-8), thereby pushing the contact rod (104a-9) against the cold shrink tube for fastening.

5. The anti-separation cold-shrink cable accessory according to claim 4, characterized in that: The tightening assembly (104) further includes a one-way snap-fit ​​connector (104b) disposed between the sliding block (104a-8) and the sliding rail (104a-1).

6. The anti-separation cold-shrink cable accessory according to claim 5, characterized in that: The one-way snap-fit ​​component (104b) includes telescopic snap teeth (104b-1) disposed on both sides of the sliding block (104a-8) and snap strips (104b-2) disposed on both sides of the sliding track (104a-1). The telescopic locking teeth (104b-1) and the locking strip (104b-2) engage with each other to maintain a self-locking effect in the tightened state.

7. The anti-separation cold-shrink cable accessory according to claim 6, characterized in that: The tightening assembly (104) also includes a return component (104c).

8. The anti-separation cold-shrink cable accessory according to claim 7, characterized in that: The return piece (104c) includes an upper through groove (104c-1) and a lower through groove (104c-2) formed in the sliding block (104a-8), and an oblique groove (104c-3) formed on the snap-fit ​​tooth (102g). A sliding crank rod (104c-4) is slidably installed in the upper through groove (104c-1), the lower through groove (104c-2) and the inclined sliding groove (104c-3). A baffle (104c-5) is provided below the sliding crank rod (104c-4) to abut against the protruding block (104a-7). When the sliding crank (104c-4) moves downward, it causes its inclined surface to slide along the inclined slide groove (104c-3), causing the locking tooth (102g) to retract backward to release the self-locking, thereby causing the sliding block (104a-8) to move backward and reset under the action of elastic force.

9. A cold-shrink cable accessory for preventing separation according to claim 4, characterized in that: The protruding block (104a-7) is smaller at one end near the insertion space than at the other end, so that the protruding block (104a-7) can smoothly enter the insertion space and push out the sliding block (104a-8).

10. A cold-shrink cable accessory for preventing separation according to claim 9, characterized in that: The side of the protruding block (104a-7) that contacts the sliding block (104a-8) has an arc surface.

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