# US 2019/0170947 A1 · Plug protection cap, optical fiber connector assembly, fiber plug, and network device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170947 A1 - Document ID: US20190170947A1 - Status: Published application - Kind: A1 - Application number: 16/272,081 - Filed: 2019-02-11 - Published: 2019-06-06 - Earliest claimed: 2015-05-20 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xiongwei YAN; Wenxin WU; Yuliang WANG; Xuesong HUANG - Web page: https://patentgrep.com/patent/US20190170947A1 ## CPC - G02B 6/3821: {with axial spring biasing or loading means (G02B6/3847 takes precedence)} - G02B 6/387: {Connector plugs comprising two complementary members, e.g. shells, caps, covers, locked together} - G02B 6/3849: {using mechanical protective elements, e.g. caps, hoods, sealing membranes (G02B6/3816 takes precedence; provisionally see H01R13/44)} - G02B 6/3869: {Mounting ferrules to connector body, i.e. plugs} - G02B 6/545: {Pulling eyes (G02B6/475 takes precedence)} - G02B 6/3816: {for use under water, high pressure connectors (provisionally see G02B6/4428)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract The present disclosure discloses a plug protection cap that includes a main body, a connecting sleeve, and a traction stub. An accommodating cavity is disposed in the main body. An inlet is through the accommodating cavity that is disposed on an end face of one end of the main body. One end of the connecting sleeve detachably sheathes one end that is of the main body and that is away from the inlet, and the other end of the connecting sleeve is connected to one end of the traction stub in a rotatable manner. The present disclosure further discloses an optical fiber connector assembly, a fiber plug, and a network device. ## Claims ### Claim 1 A plug protection cap comprising: a main body, wherein an accommodating cavity is disposed in the main body, an inlet that extends through the accommodating cavity is disposed on an end face of one end of the main body; a connecting sleeve; and a traction stub, wherein one end of the connecting sleeve detachably sheathes one end that is of the main body and that is away from the inlet, and the other end of the connecting sleeve is connected to one end of the traction stub in a rotatable manner. ### Claim 2 (depends on 1) The plug protection cap according to claim 1, comprises: a first flange disposed on an outer circumferential surface of the one end of the traction stub; and a second flange disposed on an inner circumferential surface of the other opening that is of the connecting sleeve and that is away from a first inner thread, wherein the first flange is clamped onto the second flange, and wherein the first flange is rotatable relative to the second flange. ### Claim 3 (depends on 2) The plug protection cap according to claim 2, wherein the traction stub is a column, wherein one end of the traction stub is away from the first flange is a pointed part, and a groove is disposed inside the end of the traction stub at which the first flange is disposed. ### Claim 4 (depends on 1) The plug protection cap according to claim 1, further comprising a locking part is disposed at a position that is on an inner circumferential surface of the accommodating cavity and that is near the inlet, wherein the locking part is one of an inner thread, a hook, a slot, or an elastic bulge. ### Claim 5 (depends on 1) The plug protection cap according to claim 1, comprising: openings disposed at both ends of the connecting sleeve; a first inner thread disposed on an inner circumferential surface of one of the openings; and a first outer thread connected to the first inner thread disposed on an outer circumferential surface of the end that is of the main body and that is away from the inlet. ### Claim 6 (depends on 5) The plug protection cap according to claim 5, wherein the main body is a hollow column that is open at one end and closed at the other end and has a terraced pattern, and wherein an outer circumference of the end at which the inlet is disposed is greater than an outer circumference of the end at which the first outer thread is disposed. ### Claim 7 (depends on 1) The plug protection cap according to claim 1, wherein a through hole is further disposed on the traction stub. ### Claim 8 An optical fiber connector assembly, wherein the optical fiber connector assembly comprises a plug protection cap, and a connector, wherein the plug protection cap comprises: a main body, wherein an accommodating cavity is disposed in the main body, an inlet that extends through the accommodating cavity is disposed on an end face of one end of the main body; a connecting sleeve; and a traction stub, wherein one end of the connecting sleeve detachably sheathes one end that is of the main body and that is away from the inlet, and the other end of the connecting sleeve is connected to one end of the traction stub in a rotatable manner; and wherein the connector comprises a plug core, a plug core holder, a limiting sleeve, a spring, a rear retainer, and a sealing ring; wherein the limiting sleeve comprises an accommodating cavity, a first jack, a second jack opposite to the first jack, and at least one limiting elastic plate, wherein both the first jack and the second jack extend through the accommodating cavity, the at least one limiting elastic plate is disposed at an edge of the second jack and extends in a direction parallel to an axis of the limiting sleeve, and the sealing ring sheathes one end, at which the second jack is disposed, of the limiting sleeve; wherein one end of the limiting sleeve is connected to the plug core holder in a plug-in manner, the spring and the rear retainer sheathe the plug core, and the plug core passes through the plug core holder and the accommodating cavity and protrudes out of the second jack; wherein the spring and a portion of the rear retainer are located in the accommodating cavity, and the spring connects the rear retainer and the accommodating cavity; and wherein the at least one limiting elastic plate is clamped onto the rear retainer. ### Claim 9 (depends on 8) The optical fiber connector assembly according to claim 8, wherein an abut flange is disposed on an inner circumferential surface of the accommodating cavity, wherein a boss is disposed on an outer circumferential surface of one end of the rear retainer, and wherein two end parts of the spring separately abut against the boss and the abut flange. ### Claim 10 (depends on 9) The optical fiber connector assembly according to claim 9, wherein the plug core comprises a connecting body and a head located at one end of the connecting body, wherein the rear retainer sheathes the plug core, and wherein the end of the rear retainer at which the boss is disposed is located at a joint between the head and the connecting body. ### Claim 11 (depends on 9) The optical fiber connector assembly according to claim 9, the at least one limiting elastic plates comprising two limiting elastic plates, wherein a hook is disposed at a free end of one of the two limiting elastic plates, and wherein a clamping bulge or a slot adaptable to the hook is disposed on the boss of the rear retainer. ### Claim 12 (depends on 8) The optical fiber connector assembly according to claim 8, wherein the plug core holder comprises an outer sealing sleeve and an inner crimping ring, wherein the inner crimping ring is disposed by clinging to an inner circumferential surface of the outer sealing sleeve, and wherein an axial length of the inner crimping ring is less than an axial length of the outer sealing sleeve. ### Claim 13 A connector, wherein the connector comprises: a plug core; a plug core holder; a limiting sleeve; a spring; a rear retainer; and a sealing ring; wherein the limiting sleeve comprises an accommodating cavity, a first jack, a second jack opposite to the first jack, and at least one limiting elastic plate, both the first jack and the second jack extend through the accommodating cavity, the at least one limiting elastic plate is disposed at an edge of the second jack and extends in a direction parallel to an axis of the limiting sleeve, and the sealing ring sheathes one end, at which the second jack is disposed, of the limiting sleeve; wherein one end of the limiting sleeve is connected to the plug core holder in a plug-in manner, the spring and the rear retainer sheathe the plug core, and the plug core passes through the plug core holder and the accommodating cavity and protrudes out of the second jack; wherein the spring and a portion of the rear retainer are located in the accommodating cavity, and the spring connects the rear retainer and the accommodating cavity; and wherein the at least one limiting elastic plate is clamped onto the rear retainer. ### Claim 14 (depends on 13) The connector according to claim 13, wherein an abut flange is disposed on an inner circumferential surface of the accommodating cavity, wherein a boss is disposed on an outer circumferential surface of one end of the rear retainer, and wherein two end parts of the spring separately abut against the boss and the abut flange. ### Claim 15 (depends on 14) The connector according to claim 14, wherein the plug core comprises a connecting body and a head located at one end of the connecting body, wherein the rear retainer sheathes the plug core, and wherein the end of the rear retainer at which the boss is disposed is located at a joint between the head and the connecting body. ### Claim 16 (depends on 14) The connector according to claim 14, the at least one limiting elastic plates comprising two limiting elastic plates, wherein a hook is disposed at a free end of one of the two limiting elastic plates, and wherein a clamping bulge or a slot adaptable to the hook is disposed on the boss of the rear retainer. ### Claim 17 (depends on 13) The connector according to claim 13, wherein the plug core holder comprises an outer sealing sleeve and an inner crimping ring, wherein the inner crimping ring is disposed by clinging to an inner circumferential surface of the outer sealing sleeve, and wherein an axial length of the inner crimping ring is less than an axial length of the outer sealing sleeve.