US-20260124665-A1 - INTERMITTENT ROTATION STRUCTURE FOR EXTENSION TOOL, AND EXTENSION TOOL

US20260124665A1US 20260124665 A1US20260124665 A1US 20260124665A1US-20260124665-A1

Abstract

Disclosed is an intermittent rotation structure for an extension tool. Wherein the roller is in contact with the circumferential side wall of the rotary cam, the front end of the ejector pin is sleeved with a rotary sleeve, the tail of the ejector pin is sleeved with a guide sleeve, the outer side wall of the ejector pin disposed in the rotary sleeve and the guide sleeve is sleeved with a spring, a rotary gear is disposed on an outer side wall of the rotary sleeve in a transmission manner, a plurality of extending portions are disposed on the end face of the rotary sleeve; an incomplete gear is disposed on an end face of the rotary cam, a first driven gear is disposed at one side of the incomplete gear in a transmission manner.

Inventors

Jianwei SHAO
Jiazhong Cheng

Assignees

CHANGZHOU CANTY ELECTRIC INDUSTRY CO., LTD

Dates

Publication Date: 20260507
Application Date: 20221114
Priority Date: 20221104

Claims (18)

1 . An intermittent rotation structure for extension tool, wherein the intermittent rotation structure comprises: a rotary cam, a roller and an ejector pin, the roller is rotationally disposed at the tail of the ejector pin, the roller is in contact with the circumferential side wall of the rotary cam, the front end of the ejector pin is sleeved with a rotary sleeve, the tail of the ejector pin is sleeved with a guide sleeve, the outer side wall of the ejector pin disposed in the rotary sleeve and the guide sleeve is sleeved with a spring, the ejector pin moves along the direction of a guide groove disposed in the guide sleeve, a rotary gear is disposed on an outer side wall of the rotary sleeve in a transmission manner, a plurality of extending portions are disposed on the end face of the rotary sleeve close to the front end portion of the ejector pin; an incomplete gear is disposed on an end face of the rotary cam, a first driven gear is disposed at one side of the incomplete gear in a transmission manner, an extension rod is disposed on the first driven gear, the extension rod extends to the rotary gear and is in transmission connection with the rotary gear by means of a second driven gear.
2 . The intermittent rotation structure for extension tool according to claim 1 , wherein the incomplete gear is provided with a meshing tooth, the first driven gear comprises a first gear seat and a first driven tooth, which is disposed on the first gear seat and is in transmission connection with the meshing tooth on the incomplete gear.
3 . The intermittent rotation structure for extension tool according to claim 2 , wherein the incomplete gear comprises a gear seat and a meshing tooth disposed on the gear seat, the meshing tooth is a conical tooth, the gear seat where the meshing tooth is located is provided with a notch, the side of the first gear seat is a regular polygon in shape, the first driven tooth is a conical tooth, the first driven tooth is in transmission connection with the meshing tooth.
4 . The intermittent rotation structure for extension tool according to claim 3 , wherein the side of the first gear seat is in contact connection with the side surface of a side of the gear seat of the incomplete gear close to the meshing tooth, the corner of the two connecting sides of the first gear seat rotates in a transitional manner through the notch provided on the gear seat of the incomplete gear.
5 . The intermittent rotation structure for extension tool according to claim 3 , wherein the regular polygon comprises a regular triangle, a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon.
6 . The intermittent rotation structure for extension tool according to claim 1 , wherein a first step is disposed on the rotary sleeve close to the rotary gear, a plurality of protruding portions are disposed on the first step, the inner wall of the rotary gear is provided with a plurality of slots, each of the plurality of slots is engaged with one of the plurality of protruding portions.
7 . The intermittent rotation structure for extension tool according to claim 6 , wherein a gap is disposed between the side wall of the first step and the rotary gear, inclined surfaces are disposed on the side walls of the two sides of the plurality of extending portions disposed on the end surface of the rotary sleeve.
8 . The intermittent rotation structure for extension tool according to claim 1 , wherein an end of the rotary sleeve close to the guide sleeve is fitted inside the guide sleeve.
9 . The intermittent rotation structure for extension tool according to claim 1 , wherein a second step is disposed on the inner side wall of an end of the rotary sleeve close to the guide sleeve, a third step extending outward is disposed on the rear end of the ejector pin, the two ends of the spring are respectively abutted against the second step and the third step.
10 . An extension tool, wherein the extension tool comprises an intermittent rotation structure for extension tool, the intermittent rotation structure for extension tool comprises: a rotary cam, a roller and an ejector pin, the roller is rotationally disposed at the tail of the ejector pin, the roller is in contact with the circumferential side wall of the rotary cam, the front end of the ejector pin is sleeved with a rotary sleeve, the tail of the ejector pin is sleeved with a guide sleeve, the outer side wall of the ejector pin disposed in the rotary sleeve and the guide sleeve is sleeved with a spring, the ejector pin moves along the direction of a guide groove disposed in the guide sleeve, a rotary gear is disposed on an outer side wall of the rotary sleeve in a transmission manner, a plurality of extending portions are disposed on the end face of the rotary sleeve close to the front end portion of the ejector pin; an incomplete gear is disposed on an end face of the rotary cam, a first driven gear is disposed at one side of the incomplete gear in a transmission manner, an extension rod is disposed on the first driven gear, the extension rod extends to the rotary gear and is in transmission connection with the rotary gear by means of a second driven gear; and the extension tool further comprises a casing, a fixed sleeve and a conical extension head, the intermittent rotation structure for extension tool is disposed in the casing, an ejector pin and a front end of a rotary sleeve extend from the casing, the fixed sleeve is sleeved on the rotary sleeve and is fixedly connected with the casing, the conical extension head is movably and detachably disposed on the fixed sleeve, the ejector pin is configured to expand the conical extension head.
11 . The extension tool according to claim 10 , wherein the incomplete gear is provided with a meshing tooth, the first driven gear comprises a first gear seat and a first driven tooth, which is disposed on the first gear seat and is in transmission connection with the meshing tooth on the incomplete gear.
12 . The extension tool according to claim 11 , wherein the incomplete gear comprises a gear seat and a meshing tooth disposed on the gear seat, the meshing tooth is a conical tooth, the gear seat where the meshing tooth is located is provided with a notch, the side of the first gear seat is a regular polygon in shape, the first driven tooth is a conical tooth, the first driven tooth is in transmission connection with the meshing tooth.
13 . The extension tool according to claim 12 , wherein the side of the first gear seat is in contact connection with the side surface of a side of the gear seat of the incomplete gear close to the meshing tooth, the corner of the two connecting sides of the first gear seat rotates in a transitional manner through the notch provided on the gear seat of the incomplete gear.
14 . The extension tool according to claim 12 , wherein the regular polygon comprises a regular triangle, a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon.
15 . The extension tool according to claim 10 , wherein a first step is disposed on the rotary sleeve close to the rotary gear, a plurality of protruding portions are disposed on the first step, the inner wall of the rotary gear is provided with a plurality of slots, each of the plurality of slots is engaged with one of the plurality of protruding portions.
16 . The intermittent rotation structure for extension tool according to claim 15 , wherein a gap is disposed between the side wall of the first step and the rotary gear, inclined surfaces are disposed on the side walls of the two sides of the plurality of extending portions disposed on the end surface of the rotary sleeve.
17 . The intermittent rotation structure for extension tool according to claim 10 , wherein an end of the rotary sleeve close to the guide sleeve is fitted inside the guide sleeve.
18 . The intermittent rotation structure for extension tool according to claim 10 , wherein a second step is disposed on the inner side wall of an end of the rotary sleeve close to the guide sleeve, a third step extending outward is disposed on the rear end of the ejector pin, the two ends of the spring are respectively abutted against the second step and the third step.

Description

TECHNICAL FIELD The present application relates to the field of extension tool, in particular, relates to an intermittent rotation structure for extension tool and an extension tool. BACKGROUND Due to the rising cost of metal copper pipes, polymer pipe fittings are becoming increasingly popular in residential and commercial building structures. One of common types of polymer pipe fittings is made from cross-linked polyethylene, commonly known as PEX. The polymer pipe fittings have good toughness, utilizing the characteristics of slow contraction after the nozzle is expanded, they are connected to the joint before the nozzle is completely shrunk. After completely shrinking, the nozzle is tightly wrapped on the joint, the closer the expanded nozzle is to a circle, the better the airtightness between the joint and the connector. A typical building will have a plurality of joints, it can be seen that, the installation of the pipe fitting refers to expanding the nozzles of a plurality of pipes. At present, there is an extension tool on the market, during use, it is found that after the end of the extension tool is inserted into the pipe fitting, due to the extension tool is operated manually by the worker, that is, the extension tool is not easy to rotate, resulting in the expanded end of the pipe fitting to be non-circular in shape, which is caused by the shape of the conical extension head installed on the end of the extension tool. Therefore, when expanding the pipe fitting, the conical extension head is needed to be rotated, so that the pipe fitting is round in shape after being expanded, this facilitates the fitting and installation with the joint, ensuring that the expanded nozzle fits tightly with the joint. However, the conical extension head cannot be rotated all the time during the extension process, otherwise the extension of the pipe fitting cannot be realized, it is thus needed to provide an intermittent rotation structure for extension tool and an extension tool to solve the above problems. SUMMARY Therefore, it is necessary to provide an intermittent rotation structure for extension tool and an extension tool that are simple in structure, easy to operate, and effective to rotate the conical extension head. In order to achieve the above object, the present application provides an intermittent rotation structure for extension tool, the intermittent rotation structure comprises: a rotary cam, a roller and an ejector pin, the roller is rotationally disposed at the tail of the ejector pin, the roller is in contact with the circumferential side wall of the rotary cam, the front end of the ejector pin is sleeved with a rotary sleeve, the tail of the ejector pin is sleeved with a guide sleeve, the outer side wall of the ejector pin disposed in the rotary sleeve and the guide sleeve is sleeved with a spring, the ejector pin moves along the direction of a guide groove disposed in the guide sleeve, a rotary gear is disposed on an outer side wall of the rotary sleeve in a transmission manner, a plurality of extending portions are disposed on the end face of the rotary sleeve close to the front end portion of the ejector pin; an incomplete gear is disposed on an end face of the rotary cam, a first driven gear is disposed at one side of the incomplete gear in a transmission manner, an extension rod is disposed on the first driven gear, the extension rod extends to the rotary gear and is in transmission connection with the rotary gear by means of a second driven gear. As a preferred embodiment of the present application, the incomplete gear is provided with a meshing tooth, the first driven gear comprises a first gear seat and a first driven tooth, which is disposed on the first gear seat and is in transmission connection with the meshing tooth on the incomplete gear. As a preferred embodiment of the present application, the incomplete gear comprises a gear seat and a meshing tooth disposed on the gear seat, the meshing tooth is a conical tooth, the gear seat where the meshing tooth is located is provided with a notch, the side of the first gear seat is a regular polygon in shape, the first driven tooth is a conical tooth, the first driven tooth is in transmission connection with the meshing tooth. As a preferred embodiment of the present application, the side of the first gear seat is in contact connection with the side surface of a side of the gear seat of the incomplete gear close to the meshing tooth, the corner of the two connecting sides of the first gear seat rotates in a transitional manner through the notch provided on the gear seat of the incomplete gear. As a preferred embodiment of the present application, the regular polygon comprises a regular triangle, a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon. As a preferred embodiment of the present application, a first step is disposed on the rotary sleeve close to the rotary gear, a plurality of pr