Handle holder of blade tool

A blade tool, comprising:

• a blade;
• and
• a handle holder, comprising:
• a blade holder configured to detachably mount said blade;
• a pivot unit;
• a first holder member having a first pivot end, a first opening end and a blade recess having a size and a shape configured to receive said blade holder with said blade mounted thereon;
• a second holder member having a second pivot end and a second opening end, wherein said second pivot end is pivotally connected with said first pivot end of said first holder member by said pivot unit to form a blade housing and define a blade opening at said first opening end of said first holder member and said second opening end of said second holder member, such that when said first holder member and said second holder member are overlapped with inner surfaces thereof facing each other, said second holder member covers said blade recess of said first holder member to form a blade cavity and said first opening end of said first holder member and said second opening end of said second holder member cooperatively defines said blade opening communicating with said blade cavity, and that said first holder member and said second holder member are rotatable relative to each other about said pivot unit between an enclosing condition and an operable condition, wherein in the enclosing condition, said first holder member and said second holder member are overlapped and said blade holder is able to be retained within said blade cavity, wherein in the operable condition, said first holder member and said second holder member are able to be rotated about said pivot unit for a predetermined included angle, such that said blade holder is able to slide within said blade cavity and move towards said blade opening of said blade cavity due to gravity to extend at least one portion of said blade out of said blade housing;
• and
• a locker device, coupled with at least one of said first holder member and said second holder member, comprising a movable locking element configured to:
• selectively limit said blade holder movably within said blade cavity in at least one of a retracted position and an extended position, wherein in the retracted position, said blade is received within said blade cavity, and in the extended position, said at least one portion of said blade is extended outwards through said blade opening, and
• selectively lock relative positions of said first holder member and said second holder member with respect to each other so as to selectively lock said handle holder in the enclosing condition and selectively permit rotation to the operable condition.