Limiting and guiding structure of unloosening screw

Abstract

The invention relates to a limiting and guiding structure of an unloosening screw. The limiting and guiding structure comprises a mounting shell and a plug-in shell arranged at a front end of the mounting shell, wherein a flange of the plug-in shell is provided with a through hole for a non-disengagement screw to penetrate out, the front end of the mounting shell is provided with a supporting typestepped hole used for conducting axial limiting and radial limiting of the non-disengagement screw, the supporting type stepped hole comprises a stepped inner hole and a stepped outer hole formed ona front end of the stepped inner hole, the diameter of the stepped outer hole is larger than the outer diameter of a threaded portion of the non-disengagement screw, the outer diameter of the threadedportion is larger than the diameter of the stepped inner hole, and a screw rod is arranged in the stepped inner hole in a sliding mode. The limiting and guiding structure is advantaged in that the mounting shell adopts the support type stepped hole form to realize axial limiting and radial limiting of the screw, so the screw which is not separated is kept in a good horizontal posture, a connectoris convenient to insert and mount, the supporting type stepped hole extends to abut against a rear end face of the flange of the plug-in shell, a supporting face of the plug-in shell is increased inthe vertical direction, repeated plugging and unplugging are facilitated, and the service life of the connector is prolonged.

Description

technical field [0001] The invention belongs to the technical field of connectors, in particular to a position-limiting guide structure that does not come out of screws. Background technique [0002] The DB9 connector is a widely used data interface connector. The DB9 connector usually needs to be fitted with screws that do not come out to achieve anti-loosening after mating. At the same time, the installation shell of the small DB9 connector is often designed with a closed structure at the hand-held part for the convenience of hand-held insertion. The specific structure is as follows: Figure 1 to Figure 3 As shown: the existing DB9 connector includes a screw 101 that does not come out, a mounting shell 102, a socket shell 103 fixed inside the front end of the mounting shell, and an insulator 104 installed in the socket shell. Contacts are installed in the insulator. The contact piece is generally a pin, and the socket housing 103 is clamped and fixed in the installation sh...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the prior art are as follows: (1) the mounting hole cannot hold the screw without coming out, which may cause the screw to come out during use; even if the design is improved, such as Figure 4 As shown, the size of the mounting hole is between the thread of the non-protruding screw and the outer diameter of the screw, and the screw can still be partially protruded without protruding, causing the screw to rub against the outer wall of the mounting shell; (2) The depth of the opening of the mounting shell is the shell The wall thickness and the contact surface with the screw are small, which leads to no guide structure design when the screw does not come out, and the screw is prone to skew (such as Figure 5 As shown), it is necessary to manually adjust the screw posture during installation to achieve inter-plugging. In an environment that is not convenient for direct observation or blind-mating operation, it is difficult to align the non-protruding screw with the corresponding threaded hole of the opposite device, reducing assembly efficiency.

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