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A lock set for a door has a cylindrical spindle integrally coupled with a knob and containing a slide plate which can be actuated to lock and unlock the cylindrical spindle against rotation. The cylindrical wall of the spindle is provided with two diametrically opposing grooves which extend axially

A lock set for a door has a cylindrical spindle integrally coupled with a knob and containing a slide plate which can be actuated to lock and unlock the cylindrical spindle against rotation. The cylindrical wall of the spindle is provided with two diametrically opposing grooves which extend axially from one end thereof to a predetermined depth and which are opened at the one end so as to facilitate installation of the slide plate in the spindle. The slide plate has two opposing lugs for insertion into the grooves.

대표청구항 ▼

[ We claim:] [1.] A lock set for a door which comprises:a rotatable outer spindle having a cylindrical wall;at least one slide plate mounted movably in said cylindrical wall for moving between a locking position that locks said cylindrical wall against rotation and an unlocking position that permits

[ We claim:] [1.] A lock set for a door which comprises:a rotatable outer spindle having a cylindrical wall;at least one slide plate mounted movably in said cylindrical wall for moving between a locking position that locks said cylindrical wall against rotation and an unlocking position that permits said cylindrical wall to rotate, said slide plate having a hole therein;a rotatable inner spindle;a hollow middle spindle disposed between said inner and outer spindles, said middle spindle having one end provided with an enlarged end portion which extends into said cylindrical wall in a rotatable position relative to said cylindrical wall, and another end which is connected to said inner spindle;a turning rod passing through said hollow middle spindle and having two ends extending to said outer and inner spindles, respectively, said turning rod passing through said hole of said slide plate for moving said slide plate to said locking or unlocking position;a rotary seat provided adjacent to said one end of said outer spindle and connected to said cylindrical wall for simultaneous rotation, said rotary seat further having a hole for passage of said middle spindle in a rotatable position relative to said rotary seat, and a torsion spring sleeved around said rotary seat for returning said rotary seat and said outer spindle to their normal position after a turning movement;a clutch mechanism provided in said cylindrical wall for connecting or disconnecting said enlarged end portion to or from said rotary seat, thereby permitting said middle spindle to turn via said inner spindle and said outer spindle when said slide plate is in said unlocking position, or via said inner spindle only when said slide plate is in said locking position,said enlarged end portion being located between said slide plate and said rotary seat, said clutch mechanism including an engaging plate which is sleeved around said turning rod movably between said enlarged end portion and said slide plate for moving axially away from or toward said enlarged end portion,said clutch mechanism further having means associated with said turning rod for camming said engaging plate to move axially away from said enlarged end portion upon turning of said turning rod, a spring provided between said engaging plate and said slide plate so as to urge said engaging plate toward said enlarged end portion, and a rotary plate sleeved fittingly on said turning rod for simultaneous rotation, said rotary plate being provided between said enlarged end portion and said engaging plate, said means for camming said engaging plate being provided on said rotary plate,said engaging plate further having a prong which extends axially toward said enlarged end portion and said rotary seat, said enlarged end portion further having an aperture, said rotary seat further having a slot in alignment with said aperture of said enlarged end portion in an axial direction, said prong extending through said slot of said rotary seat and said aperture of said enlarged end portion when said engaging plate is moved toward said enlarged portion; anda connecting plate which has means for engaging with said slide plate and said enlarged end portion so as to move said slide plate via the rotation of said enlarged end portion, said connecting plate being sleeved on said turning rod in said cylindrical wall.