Patent ID: 11920707
Assignee: HANATECH CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A sealed sleeve installed at an insertion coupling portion in a state in which a first pipe and a second pipe are insertion coupled to each other in order to seal couple the first pipe having a first outer diameter and a first inner diameter and the second pipe having a second outer diameter and a second inner diameter larger than the first outer diameter, the sealed sleeve comprising:
a pillar-shaped main body having a main body central shaft; and
a through-hole formed through the main body central shaft and having an inlet as a second pipe side opening in an installation state and an outlet as a first pipe side opening in the installation state,
wherein the through-hole comprises:
a pressing portion adapted to hermetically press the insertion coupling portion, wherein the pressing portion extends from a first boundary portion positioned at an outer edge of the outlet to a second boundary portion adjoining the pressing portion, and
a pressing introducing portion extending from the inlet to the second boundary portion,

wherein the pressing portion has a constant inner diameter which is larger than the first outer diameter of the first pipe and smaller than the second outer diameter of the second pipe in prior to the state in which the sealed sleeve is installed,
wherein the sealed sleeve is formed to couple the first pipe and the second pipe after the sealed sleeve is inserted over the first pipe,
wherein the secondary boundary portion is a boundary line directly dividing the pressing portion and the pressing introducing portion such that the pressing portion and the pressing introducing portion are directly adjacent to the second boundary portion,
wherein the pressing introducing portion has a curved surface at its inner wall and an inner diameter that gradually decreases from the inlet towards the second boundary portion,
wherein in a cross-sectional view of the main body central shaft, an outer edge of the pressing introducing portion forms a convex-shaped arc having a predetermined curvature radius, and
wherein a minimum of the inner diameter of the pressing introducing portion is same as the constant inner diameter of the pressing portion.