A mop holder for adapting a mop stick and clamping a mop which is made of a plurality of elongated flexible strips, the mop holder comprising:
- a. triangular shaped hollow frame having a downwardly extending central cylindrical shaped shaft portion, a pair of downwardly tapered top walls integrally formed at opposite sides of the central shaft portion, a pair of opposite longitudinal sidewalls and a pair of opposite transverse end walls, the pair of sidewalls and the pair of end walls integrally formed with and downwardly extending from the pair of tapered top walls which form a bottom opening, the central shaft portion having a closed cavity with inner screw threads for threadedly engaging with said mop stick;
- b. an attachment socket integrally formed within said hollow frame and located adjacent to one of said pair of end walls, and between said pair of sidewalls and a respective one of said pair of top walls, the attachment socket having a channel slot extending through from the respective one of said pair of top walls of said frame to said bottom opening of said frame and an inner arrowhead annular shaped groove interconnecting with the channel slot;
- c. a longitudinal swingable mop clamping member having one end hingeably connected to the other one of said pair of end walls of said frame by a living hinge;
- d. a cylindrical shaped slidable attachment rod integrally formed on another end of said longitudinal mop clamping member opposite from said living hinge for slidably inserting through said channel slot of said attachment socket for clamping said mop thereto, the slidable attachment rod having outer screw threads;
- e. a quick release locking nut having a generally cylindrical shaped body with an upper portion, a lower portion and a central slot for accommodating said slidable attachment rod, the upper portion having a side slot interconnecting with the central slot and an outer annular groove so that a user can firmly grip the body of the quick release locking nut to rotate it, the lower portion having two spaced apart halves, each half having an outer annular protruding ridge, where the two spaced apart halves are squeezable toward each other to be press fitted within said channel slot of said attachment socket with the annular protruding ridges engaging said arrowhead annular shaped groove, the outer diameter of the lower portion being smaller than the outer diameter of the upper portion;
- f. a pawl pivotally mounted in said side slot of said cylindrical shaped body of said quick release locking nut and having a tip with inner screw threads;
- g. a coil spring biasing said tip of said pawl to engage it onto said slidable attachment rod, the coil spring being installed in said side slot;
- h. said quick release locking nut being a self-contained unit wherein said pawl and said coil spring are securely attached to said upper portion of said cylindrical shaped body of said quick release locking nut even when said lower portion of said quick release locking nut is not installed within said attachment socket;
- i. a thin wall disposed between said central slot and said side slot to partially divide them, so that said side slot is partially connected with said central slot;
- j. said thin wall disposed between said central slot and said side slot having an outward facing recess for adapting one end of said biasing spring;
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- k. said pawl having an inward facing recess located remote from said tip for adapting an opposite end of said biasing spring;
- l. whereby when said pawl is pressed against said spring and its tip is disengaged from said slidable attachment rod, said quick release locking nut is unlocked and said slidable attachment rod can be slid out from said attachment socket for allowing said mop clamping member to be released, and when said pawl is biased by said spring and its tip is engaged to said slidable attachment rod, said quick release locking nut is locked on said slidable attachment rod for preventing said mop clamping member from being released, and said quick release locking nut can be rotated to further thread on said slidable attachment rod to precisely adjust the tightness of said mop clamping member.