Patent attributes
An insulation cap of a wire joint of a joined electrical wire, the insulation cap including a cap main body for receiving the wire joint being formed by joining cores of a plurality of covered wires and an electro-conductive sleeve, and a flexible fastener provided on an inner wall of the cap main body for fastening the wire joint by contacting a rear end of the electro-conductive sleeve thereon. The flexible fastener is formed as an integral part of the cap main body by fastening a molding die through a hole provided at an opposite end of a joint insertion end of the cap main body. A plurality of flexible fasteners are provided axial symmetrically to extend toward a direction of inserting the wire joint from a base formed as an integral part of the inner wall of the cap main body.