CN110174729A - Tail portion sheath and the connector for using the tail portion sheath - Google Patents

Abstract

The invention provides a tail sheath and a connector using the tail sheath. The tail sheath of the invention includes a sleeve body, the middle part of the sleeve body has an axially extending threading channel, and the front end of the sleeve body has a In the connection section of body connection, two or more shear groove groups are arranged at intervals along the axial direction on the tail section of the sleeve body, and the groove widths of the shear groove groups of each shear groove group increase sequentially from front to back on the tail section. Considering that the farther the cable is from the front end of the sleeve, the greater the degree of deformation, the groove width of each shear groove group increases sequentially from front to back, which can increase the deformation capacity of the tail section of the sleeve from front to back, It is possible to ensure that the deformation ability of the sleeve in the axial direction is consistent with the deformation characteristics of the cable, so as to realize the smooth transition of cable bending and avoid sudden bending.

Description

Boots and connectors using the boots

technical field

The invention relates to a tail sheath and a connector using the same.

Background technique

With the rapid development of communication and information technology, fiber optic connectors are used more and more widely in people's lives, and various types of fiber optic connectors such as SC, FC, and LC have also been derived. As disclosed in the Chinese utility model patent with the authorized announcement number CN202472060U and the utility model name being a new type of SC fiber optic connector, the fiber optic connector generally includes a housing and a tail sheath installed at the tail of the housing, and the optical cable from the tail sheath The middle of the housing penetrates into the housing, and is connected with the pins in the housing and fixed relative to the housing, and the front end of the housing is used for plugging connection with an adapted connector. Wherein, the tail sheath of the optical fiber connector is used to protect the optical cable at the tail of the housing. However, when the optical fiber connector disclosed in the above-mentioned utility model patent is in use, when the optical cable is subjected to lateral tension, because the lateral bending resistance of the tail sheath is relatively large, the maximum bending deformation of the optical cable is mostly located at the tail end of the tail sheath , and it is easy to cause the cable bending radius to be smaller than the minimum bending radius required by the specification.

Aiming at such problems, the prior art also provides various solutions. For example, a Chinese invention patent application with an application publication date of 2014.01.01 and an application publication number of CN103492921A discloses a strain relief boot for optical fiber connectors. , the front end of the boot has a connection section for connecting with a connector, and a strain relief portion is provided on the tail section, the strain relief portion has a frusto-conical outer shape, and the strain relief portion consists of a plurality of coaxial annular rings spaced axially partly formed, and the ring parts are interconnected by the axial connecting part extending across the circumferential gap, that is, two adjacent ring parts and the axial connecting part enclose a shear groove, and the adjacent two ring parts are formed by The shearing groove group composed of two shearing grooves, the length direction of the grooves of the two adjacent shearing groove groups are perpendicular to each other, so that when the optical fiber in it receives lateral pulling force, it passes through the shearing groove to make the optical cable in the optical fiber connector The deformation at the tail position is relatively smooth. However, due to the axial direction of the shear groove formed by the strain relief part of the boot, the deformation capacity of the boot remains unchanged, and the farther the optical fiber is from the connector housing, the greater the deformation. The contradiction makes the optical fiber at the position where the tail section of the boot protrudes and has a sudden bending part relative to the boot, which is likely to cause the bending radius of the optical fiber at this place to be smaller than the minimum bending radius required by the use specification.

Contents of the invention

The object of the present invention is to provide a curved tail sheath that can smoothly transition with the connector housing when the cable is subjected to lateral tension; meanwhile, the invention also provides a connector using the tail sheath.

In order to achieve the above object, the tail sheath of the present invention includes a sleeve body. The middle part of the sleeve body has an axially extending threading channel. The front end of the sleeve body has a connecting section for connecting with the connector housing. More than two shearing groove groups are arranged at intervals in the direction, and the width of the shearing grooves of each shearing groove group increases sequentially from the front to the rear on the tail section. Considering that the farther the cable is from the front end of the sleeve, the greater the degree of deformation, the groove widths of the shear grooves of each shear groove group increase sequentially from front to back, which can increase the deformation capacity of the tail section of the sleeve from front to rear, as much as possible. It is possible to ensure that the deformation ability of the sleeve in the axial direction is consistent with the deformation characteristics of the cable, so as to realize the smooth transition of cable bending and avoid sudden bending.

Each group of shearing grooves includes at least one pair of single grooves, and the two grooves included in the same pair of single grooves are arranged symmetrically with respect to the axis of the sleeve body. Such a set of shear grooves ensures deformation of the tail section in two opposite directions.

When shearing grooves are arranged in groups, at least one group of shearing grooves includes two pairs of single grooves, and the groove length directions of the two pairs of single grooves are perpendicular to each other, so that the same group of shearing grooves ensures that the tail sections can be cut in four directions perpendicular to each other. out of shape.

The set of shearing grooves is evenly arranged in the axial direction of the sleeve body, so as to ensure uniform variation of the axial deformation of the sleeve body as much as possible.

The sleeve body is made of elastically deformable plastic material such as TPE, TPV or TPU, so that the sleeve body has a certain hardness and elasticity, and the deformation cushioning effect is better when the cable is subjected to lateral tension.

The connector of the present invention includes a housing and a tail sheath installed at the rear end of the housing. The tail sheath includes a sleeve body. The middle part of the sleeve body has an axially extending threading channel. The front end of the sleeve body has a The connecting section of the sleeve body is provided with more than two shearing groove groups at intervals along the axial direction on the tail section of the sleeve body, and the groove width of the shearing grooves of each shearing groove group increases sequentially from front to back on the tail section. Considering that the farther the cable is from the front end of the sleeve, the greater the degree of deformation, the groove widths of the shear grooves of each shear groove group increase sequentially from front to back, which can increase the deformation capacity of the tail section of the sleeve from front to rear, as much as possible. It is possible to ensure that the deformation ability of the sleeve in the axial direction is consistent with the deformation characteristics of the cable, so as to realize the smooth transition of cable bending and avoid sudden bending.

Each group of shearing grooves includes at least one pair of single grooves, and the two grooves included in the same pair of single grooves are arranged symmetrically with respect to the axis of the sleeve body. Such a set of shear grooves ensures deformation of the tail section in two opposite directions.

When shearing grooves are arranged in groups, at least one group of shearing grooves includes two pairs of single grooves, and the groove length directions of the two pairs of single grooves are perpendicular to each other, so that the same group of shearing grooves ensures that the tail sections can be cut in four directions perpendicular to each other. out of shape.

The set of shearing grooves is evenly arranged in the axial direction of the sleeve body, so as to ensure the uniform change of the axial deformation of the sleeve body as much as possible.

The sleeve body is made of elastically deformable plastic material such as TPE, TPV or TPU, so that the sleeve body has a certain hardness and elasticity, and the deformation cushioning effect is better when the cable is subjected to lateral tension.

Description of drawings

Fig. 1 is the structural representation of the embodiment of SC optical fiber connector of the present invention;

Fig. 2 is the sectional view of B-B place in Fig. 1;

Fig. 3 is the structural representation of tail sheath of the present invention;

Fig. 4 is a cross-sectional view at A-A in Fig. 3 .

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

The connector of the present invention may be an electrical connector or an optical fiber connector. Here, the present invention is described by taking an SC optical fiber connector as an example.

The SC optical fiber connector of the present invention includes a housing and a tail sheath installed at the rear end of the housing. The optical cable passes through the threading channel in the middle of the tail sheath and protrudes forward into the housing to connect with the pins in the housing and Keep relatively fixed with the shell. Among them, the tail sheath is shown in Figures 3 to 4, including a sleeve body, which can be made of rubber materials such as TPE, TPV, or TPU, and has certain hardness and elasticity. The front end of the sleeve has a connecting section 10 , and an inner convex ring 12 is provided on the inner peripheral surface of the front end of the connecting section 10 , and is connected to the connector housing through the inner convex ring 12 . The sleeve body has a tail section 11 on the rear side of the connecting section. In this embodiment, the tail section 11 is preferably set to a conical shape that gradually shrinks from front to back. Of course, it is not limited to other shapes in other embodiments. Such as cylindrical or stepped column. The front end of the tail section 11 close to the connecting section 10 has a deformed transition ring groove 3, and the deformed transition ring groove 3 is closed in the circumferential direction so that when the optical cable outside the housing is subjected to lateral tension, the sleeve body tail section can be deformed from the transition ring groove. Lateral deformation begins to occur at the position, and no matter what direction the optical cable is subjected to lateral tension, the lateral deformation capacity of the tail section of the sleeve at the deformation transition ring groove remains the same.

On the rear side of the deformation transition ring groove 3, a shear groove is also provided on the tail section of the sleeve body. The depth direction of the shear groove extends radially along the sleeve body, the opening is radially outward, and the length is perpendicular to the axis of the sleeve body. There are multiple shear grooves and they are arranged in groups. As shown in Figure 3, the shear groove group 2 includes two pairs of single grooves, and the same pair of single grooves, that is, the single groove pair 21 and the single groove pair 22, both include two U-shaped grooves, and The two U-shaped grooves included in the same pair of single grooves are symmetrical about the axis of the casing. The groove length directions of the two pairs of single grooves included in the shearing groove group 2 are perpendicular, so that the same group of shearing grooves ensures that the tail section can be deformed in four directions perpendicular to each other.

Of course, in other embodiments, the shear groove group includes a pair of single grooves, such as the connector shown in Figures 1 to 2, including a housing 1 and a tail sheath installed at the rear end of the housing 1, and the optical cable passes through the middle of the tail sheath. The threading channel 4 passes through and protrudes forward into the housing 1, is connected with the pin 19 in the housing 1 and remains relatively fixed with the housing. The tail section of the sleeve body of the tail sheath is also provided with seven shear groove groups on the rear side of the deformation transition ring groove 3, each shear groove group includes a pair of single grooves, and the single groove groups of two adjacent shear groove groups The groove length directions of the groove pairs are perpendicular to each other.

In the embodiment shown in Figures 3 to 4, there are four shearing groove groups 2 and they are arranged at uniform intervals in the axial direction on the tail section. The distance from the axis of the tail section decreases in depth, and the groove width increases in sequence, and the shear grooves of the shear groove group located on the rear side even communicate with the threading channel 4 . In this way, the closer the tail section is to the rear side, the stronger the deformability is, so that the optical cable located outside the casing makes a smooth transition when it is bent and deformed from the front to the rear. Of course, the number of shear groove groups is designed according to the length of the tail section of the casing, and in its implementation, it is not limited to four groups, but can be five groups, three groups, six groups, seven groups and eight groups.

On the basis of Embodiment 1, Embodiment 2 and Embodiment 3 of the connector can also be changed. As in Embodiment 2, the difference from Embodiment 1 is that in the direction from front to back, the cutting The distance from the groove bottom of the shear groove of the groove group to the axis of the tail section decreases successively, and the groove width remains unchanged; in embodiment three, the difference from embodiment one is that in the direction from front to rear, the shear The groove width of the shear grooves of the groove group increases sequentially, and the distance from the bottom of the groove to the axis of the tail section remains unchanged.

In addition, the present invention also provides a fourth embodiment of the connector. In the fourth embodiment, the shearing groove group only includes one shearing groove, and multiple shearing groove groups are evenly spaced in the axial direction, and each shearing groove group The circumferential positions of the shearing grooves on the tail section are staggered, preferably, the shearing grooves of each shearing groove group can be covered with the tail section of the casing in the circumferential direction, for example, two adjacent shearing grooves The shearing grooves of the group are staggered by a certain angle in the circumferential direction, such as 30°, 45° or 60°, so that the shearing grooves of multiple shearing groove groups can cover the tail section in the circumferential direction.

The present invention also provides a fifth embodiment of the connector. In the fifth embodiment, the shearing groove group includes three shearing grooves, and the three shearing grooves are located on the same circumference and staggered by 60° in the circumferential direction. Of course, a variety of implementations can be obtained by similar changes in Embodiment 5, such as the shearing groove group including two or four shearing grooves located on the same circumference, and the multiple shearing grooves of the same shearing groove group are in the circumferential direction Stagger a certain angle.

The present invention also provides a tail sheath, the specific structure of which is the same as that of the tail sheath in the embodiment of the above-mentioned connector, which will not be repeated here.

Claims (10)

1. The tail sheath includes a sleeve body. The middle part of the sleeve body has an axially extending threading channel. The front end of the sleeve body has a connecting section for connecting with the connector housing. The tail section of the sleeve body is arranged at intervals along the axial direction. There are more than two shearing groove groups, and the characteristic is that the width of the shearing grooves of each shearing groove group increases sequentially from the front to the rear on the tail section. 2. The tail sheath according to claim 1, wherein each set of shearing grooves includes at least one pair of single grooves, and the two grooves included in the same pair of single grooves are arranged symmetrically with respect to the axis of the casing. 3. The tail sheath according to claim 2, wherein at least one set of shearing grooves comprises two pairs of single grooves, and the groove length directions of the two pairs of single grooves are perpendicular to each other. 4. The tail sheath according to any one of claims 1-3, characterized in that, the shear groove groups are uniformly arranged in the axial direction of the sheath body. 5. The tail sheath according to any one of claims 1-3, wherein the sheath is made of elastically deformable plastic material such as TPE, TPV or TPU. 6. The connector includes a shell and a tail sheath installed at the rear end of the shell. The tail sheath includes a sleeve body. The middle part of the sleeve body has an axially extending threading channel. The front end of the sleeve body has a The connecting section of the sleeve body is provided with more than two shear groove groups at intervals along the axial direction on the tail section of the sleeve body. It is characterized in that the width of the shear grooves of each shear groove group increases sequentially from front to back on the tail section. . 7. The connector according to claim 6, wherein each set of shearing grooves includes at least one pair of single grooves, and the two grooves included in the same pair of single grooves are arranged symmetrically with respect to the axis of the casing. 8 . The connector according to claim 7 , wherein at least one set of shearing grooves includes two pairs of single grooves, and the groove length directions of the two pairs of single grooves are perpendicular to each other. 9. The connector according to any one of claims 6-8, characterized in that, the set of shearing grooves is uniformly arranged in the axial direction of the casing. 10. The connector according to any one of claims 6-8, wherein the sleeve is made of elastically deformable plastic material such as TPE, TPV or TPU.