Closure fasteners – Knob rose plates
Reexamination Certificate
2000-05-22
2001-10-16
Avila, Stephen (Department: 3617)
Closure fasteners
Knob rose plates
C292S336300, C292S347000
Reexamination Certificate
active
06302457
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a door lock that can be installed easily. The present invention also relates to a door lock for preventing loosening of the rose assembly from the lock chassis when a torque is applied the outside rose assembly.
2. Description of the Related Art
U.S. Pat. No. 4,921,289 to Shen issued on May 1, 1990 discloses a cylindrical lever type lock structure for handicapped people. It is found that the lock structure is not strong enough to resist intentional destruction by means of forcibly pulling the outside handle away from the door. U.S. Pat. No. 5,265,924 to Kim issued on Nov. 30, 1993 discloses a lever assembly for a door lock. Nevertheless, the rose assembly must be removed for adjustment in response to different thickness of the door to which the door lock is mounted. After the door lock is mounted to a door, the outside rose assembly should not be loosened when a torque is applied to the outside rose. Yet, the outside rose assembly still tends to be loosened as a result of door slam or applying a larger torque to the outside rose.
The present invention is intended to provide an improved door lock that mitigates and/or obviate the above problems.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a door lock that can be installed easily.
It is another object of the present invention to provide a door lock for preventing damage as a result of applying torque to the outside rose assembly.
It is a further object of the present invention to provide a door lock for preventing loosening of the outside rose assembly in case of door slam or applying a larger torque to the outside rose.
A door lock in accordance with the present invention comprises:
a main body including a transmission assembly and a positioning assembly, the transmission assembly including an inside spindle, an outside spindle, a retractor, and a latch bolt, the positioning assembly including an inside seat and an outside seat, the outside seat including an outer threading;
an inside rose liner mounted around the inside seat;
an inside rose mounted around the inside rose liner;
an anti-torque ring mounted around the outside seat and including two lugs formed thereon, two positioning posts respectively projecting from the lugs and extending along a longitudinal direction of the anti-torque ring;
an outside rose liner including an inner threading that is engaged with the outer threading of the outside seat, the outside rose liner including a side with an annular recessed portion for receiving the anti-torque ring, the annular recessed portion including two recess extensions for positioning the lugs of the anti-torque ring, thereby preventing loosening of the outside rose liner;
an outside rose securely mounted around the outside rose liner to rotate move therewith;
an inside handle operably connected to the transmission assembly; and
an outside handle operably connected to the transmission assembly;
whereby rotation of the outside rose causes longitudinal movement of the outside rose and the outside rose liner relative to the outside seat to suit a thickness of a door to which the door lock is mounted.
The inside seat includes an outer threading having two diametrically disposed flat surfaces. The inside rose liner includes a hole. An inner periphery that defines the hole of the inside rose liner includes two diametrically disposed flat sections. The inside rose liner is mounted around the inside seat with the flat sections of the inside rose liner engaged with the flat surfaces of the inside seat.
A pull-resisting ring is mounted around the inside seat. The pull-resisting ring includes an inner threading engaged with the outer threading of the inside seat. The inside rose liner includes two diametrically disposed protrusions, and wherein the pull-resisting ring includes a plurality of annularly spaced depressions for releasably receiving the protrusions, thereby retaining the pull-resisting ring.
The outside seat includes an outer threading having two diametrically disposed flat surfaces. The anti-torque ring including a hole. An inner periphery that defines the hole of the anti-torque ring includes two diametrically disposed flat sections. The anti-torque ring is mounted around the outside seat with the flat sections of the anti-torque ring engaged with the flat surfaces of the outside seat.
The inside rose liner includes two positioning holes. Each positioning post includes a screw hole aligned with an associated positioning hole. Two screws are provided and each is extended through the associated positioning hole and the screw hole in an associated positioning post.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 3985008 (1976-10-01), Hart
patent: 5265924 (1993-11-01), Kim
patent: 5617749 (1997-04-01), Park
Avila Stephen
Kamrath Alan
Rider Bennett Egan & Arundel LLP
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