Coupling device

A coupling device including a male member having a tapered tip portion and a lock groove and a female member for receiving said male member, comprising a lock pin resiliently urged toward said male member by means of spring means such that when said male member is inserted into said female member said lock pin is forced away from said male member by a camming action of the tapered tip portion of the male member and extends into said lock groove when said lock pin is placed in opposition to said lock groove by a further insertion of the male member into said female member;

• an outer race rotatively resiliently urged in one direction relative to said female member by outer race spring means and formed with a recess for receiving a part of said lock pin to enable its removal from said lock groove of said male member, said outer race being rotated by said outer race spring means when said lock pin extends into said lock groove of said male member to locate said recess of the outer race in a position remote from said lock pin to lock it relative to said male member;
• a slide pin for locking said outer race relative to said female member when said male member is not in said female member and releasing said outer race relative to said female member by a movement of said slide pin when said male member is inserted in said female member;
• and an outer race lock pin urged by outer race lock pin spring means to lock said outer race relative to said female member when the outer race is rotated to bring said recess in alignment with said lock pin for removing said male member from said female member.