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US 6,189,351 B1Granted
Door lock with clutching mechanism
AssigneeSchlage Lock Company LLC
InventorsBruce P. Eagan, James J. Legner, Dario Pompeii
Life of this patent
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Abstract
A door lock having a clutching mechanism for selectively engaging and disengaging the outer handle of the lock from a key spindle having latch scoops for operably engaging a latch slide. The key spindle contains a cam mechanism for moving a dogging arm from a clutched position where the outer handle through a keyed outer spindle is keyed to the key spindle to an unclutched position where the dogging arm is positioned within a circumferentially extending slot which permits about 60° rotation of the outer handle relative to the key spindle without movement of the key spindle. Hard stops are provided on an outer driver and outer hub which limit movement of the outer handle to less than the rotation permitted by the clutching mechanism.
Claims8
A door lock having an inner handle (14);
- an outer handle (12);
- a key cylinder (28) positioned within the outer handle;
- a chassis (20) containing a latch retractor;
- an inner spindle (52) having latch scoops (45) thereon, the inner spindle latch scoops being operably connected to the latch retractor, the inner spindle being operably connected to the inner handle;
- an outer spindle (42) keyed to the outer handle;
- and a tubular key spindle (44) positioned within the outer spindle, the key spindle having two latch scoops (45) thereon, the key spindle latch scoops being operably connected to the latch retractor, characterized in that:
- a lost motion means for operatively connecting the key cylinder to the key spindle and for permitting the key cylinder to freely rotate a predetermined degree of rotation relative to the key spindle, the lost motion means comprising the key spindle having an aperture (62) therein and a rotatable plug bushing (67) therein, a cam pin (60) extending radially from the plug bushing into the key spindle aperture, a spring which is free of contact with said plug bushing biasing said plug bushing toward said latch retractor, ends of said cam pin engaging the plug bushing and the key spindle the key cylinder operably engaging the plug bushing whereby, when the key cylinder is rotated, the plug bushing and cam pin rotate, the cam pin contacting an edge of the aperture thereby transmitting the rotary motion of the key cylinder to the key spindle.
4 more elements
A door lock having an inner handle (14);
- an outer handle (12);
- a key cylinder (28) positioned within the outer handle;
- a chassis (20) containing a latch retractor;
- an inner spindle (52) having latch scoops (45) thereon, the inner spindle latch scoops being operably connected to the latch retractor, the inner spindle being operably connected to the inner handle;
- an outer spindle (42) keyed to the outer handle;
- and a tubular key spindle (44) positioned within the outer spindle, the key spindle having two latch scoops (45) thereon, the key spindle latch scoops being operably connected to the latch retractor, an outer driver (32) connected to the outer handle, characterized in that:
- a lost motion means for operatively connecting the key cylinder to the key spindle and for permitting the key cylinder to freely rotate a predetermined degree of rotation relative to the key spindle, the lost motion means comprising the key spindle having an aperture (62) therein and a rotatable plug bushing (67) therein, a cam pin (60) extending radially from the plug bushing into the key spindle aperture, a spring which is free of contact with said plug bushing biasing said plug bushing toward said latch retractor the key cylinder operably engaging the plug bushing whereby, when the key cylinder is rotated, the plug bushing and cam pin rotate, the cam pin contacting an edge of the key spindle aperture thereby transmitting the rotary motion of the key cylinder to the key spindle, the key spindle having a plug stem therein, the plug stem being rotatable about the plug bushing, the plug stem having an axially extending aperture (72) therein, the plug stem aperture having a bow tie shape, the key cylinder having a tail piece (29) extending therefrom, the tail piece engaging the bow tie shaped aperture, the plug stem having a circumferentially extending aperture therein, the cam sin extending through the plug stem circumferential aperture, the bow tie shaped aperture, the plug stem circumferential aperture, the key spindle aperture and cam pin acting as a lost motion connection between the key cylinder tail piece and the plug bushing, the outer driver having a pair of opposed stops (75) projecting towards the chassis, the chassis including an outer hub (40), the outer hub having a pair of opposed stops (77) projecting towards the outer driver, the driver stops interacting with the hub stops to limit rotation of the outer handle relative to the chassis wherein the degree of lost motion provided by the bow tie shaped aperture and the plug stem aperture is greater than the degree of rotation of the outer handle relative to the hub.
4 more elements
Dependencies are inferred from the claim text.