Parting locking device and injection molding mold assembly using same

A parting locking device comprising:

• a base holder;
• a locking member including a bar inserting hole vertically extending through the locking member;
• and
• a locking bar configured to be inserted into and pulled out of the bar inserting hole,
• wherein the base holder comprises:
• a vertically penetrating portion having two side surfaces;
• engagement ribs provided on the two side surfaces of the vertically penetrating portion so as to be opposed to each other, the engagement ribs including engagement recesses provided in respective longitudinal midway portions of the engagement ribs so as to be opposed to each other;
• and
• first engagement element paths and second engagement element paths arranged such that the engagement ribs are located between the first engagement element paths and the respective second engagement element paths,
• wherein the locking member comprises:
• an insertion portion configured to be inserted into and pulled out of the vertically penetrating portion of the base holder;
• an engagement element having two ends, the engagement element being mounted to the bar inserting hole such that the engagement element is movable in a thickness direction of the locking bar, and such that the two ends of the engagement element protrude out of the insertion portion so as to be engageable in the respective engagement recesses;
• and
• a spring configured to bias the engagement element,
• wherein the locking bar comprises a thick-walled portion and a thin-walled portion that are arranged in a longitudinal direction of the locking bar,
• wherein the parting locking device is configured to create:
• a first state in which the thick-walled portion is located between the engagement element and an inner surface of the bar inserting hole;
• a second state in which the thin-walled portion is located between the engagement element and the inner surface of the bar inserting hole;
• and
• a third state in which the locking bar is pulled out of the locking member,
• wherein the first state, the second state, and the third state are configured to be selectively switched according to how much the locking bar is inserted in the bar inserting hole,
• wherein, in the second state, the engagement element is pushed by the spring, and is moved to an engaged position in which the engagement element is engaged in the engagement recesses, thereby keeping the locking member coupled to the base holder,
• wherein, in the first state, the engagement element is moved into the first engagement element paths while compressing the spring, thereby uncoupling the locking member from the base holder, and
• wherein, in the third state, the engagement element is pushed by the spring, and moved into the second engagement element paths, thereby uncoupling the locking member from the base holder.