In-mold detachable marking device
The present invention provides an in-mold detachable marking device which does not lock rotation of an index body even when the index body is repeatedly rotated to switch marking indications. An in-mold detachable marking device comprises a substantially cylindrical outer shell body for indication fit into a molding mold, an index body fit into the outer shell body for indication and configured to be angularly displaceable around the axis line of the outer shell body for indication, a cover body screwed at the lowermost part of the outer shell body for indication, and a spring which biases the index body with the downward force, said outer shell body for indication and said index body having a marking indication part formed on their surfaces, wherein the index body comprises an index part facing inner surface of the mold, a positioning part extending downward from the index part, and a shaft extending downward from the positioning part, the shaft having a threaded part in its lower part, the spring has an engaging part which engages with the index part, and a fixed part which is fixed to the cover body, pitch of the spring of the engaging part and pitch of the threaded part are equal, and the engaging part and the threaded part engage each other.
1. An in-mold detachable marking device comprising:
a substantially cylindrical outer shell body for indication fit into a molding mold,
an index body fit into said outer shell body for indication and configured to be angularly displaceable around the axis line of said outer shell body for indication,
a cover body screwed at a lowermost part of said outer shell body for indication, and
a spring which biases said index body with the downward force,
said outer shell body for indication and said index body having a marking indication part formed on their surfaces,
wherein said index body comprises an index part facing inner surface of said mold, a positioning part extending downward from said index part, and a shaft extending downward from said positioning part,
said shaft having a threaded part in its lower part,
said spring has an engaging part which engages with said threaded part of the index body, and a fixed part which is fixed to said cover body,
pitch of said spring of said engaging part and pitch of said threaded part are equal, and said engaging part and said threaded part engage each other
wherein a groove portion is formed on the cover body, said groove portion comprising an annular part and a linear part;
wherein the fixed part is located at a lower part of the spring, and the fixed part has an annular part and a linear part; said annular part being arranged in the annular part of the groove portion of the cover body, and said linear part being arranged in the linear part of the groove portion of the cover body.
2. The in-mold detachable marking device according to claim 1 ,
wherein said marking device comprises an inner wall of said outer shell body for indication, an upper part receiving said index part, a middle part located below said upper part, where said positioning part is located in the middle part, and a lower part located below said middle part and receiving said shaft,
said lowermost part of said outer shell body for indication is located below said lower part of the outer shell body and has a larger diameter than said lower part, and comprises a female thread part to be screwed with said cover body,
and said top surface of said cover body and said lower part of said outer shell body for indication come into contact.
3. The in-mold detachable marking device according to claim 1 ,
wherein at said positioning part of said index body, a projecting part for positioning which projects in a radial direction of said positioning part is provided,
said projecting part for positioning comprising a positioning spring embedded in said positioning part and a fitting part placed at a tip of said positioning spring,
said projecting part for positioning is fit into said middle part of inner wall surface of said outer shell body for indication and positioning grooves extending in an axial direction of said outer shell body for indication are formed continuously and at equal intervals along a circumferential direction of said outer shell body for indication.
4. The in-mold detachable marking device according to claim 1 ,
said cover body is in a substantially cylindrical shape in a planar view and has a female thread part on the peripheral surface of said cylinder.
5. The in-mold detachable marking device according to claim 2 ,
where said fixed portion of the spring is held in place in the annular part and the linear part of the groove portion of the cover body when the cover body is screwed into the female threaded part of the outer shell body, and said top surface of said cover body and said lower part of said outer shell body for indication come into contact.