Patent ID: 9206635
Filing Date: 2015-12-08
Classification: E05F

Abstract:
1. A door closing device, comprising: a cylinder including a cylinder body having a fixed end and a free end opposite to said fixed end, and a piston rod axially movable in said cylinder body and having one end extending out of said free end; a locking unit including a casing disposed around said piston rod and on said free end of said cylinder body, and a locking ring and an abutment member both disposed in said casing, said locking ring being disposed around said piston rod and being movable between an inclined position, where said locking ring is oblique to said piston rod and an inner periphery of said locking ring engages said piston rod, and a non-inclined position, where said inner periphery of said locking ring disengages said piston rod; and a press unit disposed on said casing and movable between a pressed position, where said press unit presses said locking ring to move to said inclined position, and an unpressed position, where said press unit moves away from said locking ring; wherein said abutment member is able to abuts against said locking ring to keep said locking ring in said inclined position when said press unit is in said unpressed position; wherein said press unit includes a press button slidably disposed on said casing, and a push member that protrudes from said press button, that pushes one end of said locking ring which is spaced apart radially from said piston rod when said press unit is in said pressed position, and that does not push said one end of said locking ring when said press unit is in said unpressed position, said abutment member including an abutment element that is biased to move toward and abut against another end of said locking ring which is spaced apart radially from said piston rod and which is opposite to said one end of said locking ring in order to place said locking ring in said inclined position when said push member does not push said one end of said locking ring and when said press unit is in said unpressed position.