Locks – Special application – For control and machine elements
Reexamination Certificate
1999-08-17
2001-08-28
Barrett, Suzanne Dino (Department: 3627)
Locks
Special application
For control and machine elements
C070S451000, C070S452000, C292S336300, C292S357000
Reexamination Certificate
active
06279360
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cylindrical lock with simpler positioning assembly that has reduced number of components to allow easy assembly procedure and short assembly time in addition to improved structural strength.
2. Description of the Related Art
Cylindrical locks of the type having levers are commonly used in public areas for providing operational convenience to handicapped people. Yet, the internal components of the lever type cylindrical locks are apt to be damaged by the relatively large torque resulting from turning of the lever. U.S. Pat. No. 3,126,217 to Russell et al issued on Mar 24. 1964 discloses a low-friction frame for locking devices. Nevertheless, a housing 10 is required to enclose the left and right frame sections 13 and 12 after assembly. Namely, the component number is still too large and the assembly procedure is time-consuming. U.S. Pat. No. 5,845,522 to Shen issued on Dec. 8, 1998 discloses a fastening arrangement for a cylindrical lock for firmly connecting stationary components of the lock together and for securely anchoring the firmly connected stationary components to the door so as to ensure proper operation of the door. Nevertheless, it is found that there are too many fastening components, including chassis, outer casing for chassis, inside escutcheon, outside escutcheon, inside hub and outside hub. The cost is high and the assembly procedure is time-consuming. In addition, the outside escutcheon with studs should be further improved in the structural strength to prevent forcible destruction.
The present invention is intended to provide a cylindrical lock with simpler yet stronger positioning assembly device that mitigates and/or obviates the above problems.
SUMMARY OF THE INVENTION
A cylindrical lock in accordance with the present invention comprises:
a transmission assembly including a retractor, an inside spindle, an outside spindle, a latch bolt, a lock core transmission device, an inside handle, and an outside handle; and
a positioning assembly including an inside hub, an outside hub, an inside escutcheon, and an outside escutcheon;
the improvements comprising:
the inside hub including a flange formed on an outer periphery thereof, the inside hub further including a first side and a second side, two diametrically opposed tabs projecting from the first side of the inside hub, a tubular member projecting from the second side of the inside hub and including two diametrically opposed recesses in an outer periphery thereof, two diametrically disposed through-holes being defined in the flange and aligning with the recesses, respectively;
the outside hub including a tubular section having an outer threading with two diametrically opposed recessed sections, the tubular section including an annular flange formed on an inner periphery thereof, an annular wall extending longitudinally from the tubular section and having an inner diameter greater than that of the tubular section, the annular wall including two notches aligned with the recessed sections of the outside hub, respectively, a bottom wall defining each said notch having a screw hole extended therethrough and aligned with an associated said through-hole in the inside hub, the annular wall of the outside hub further including an inwardly, radially extending arcuate supporting ledge projected from an inner periphery thereof, an arcuate stepped section being formed on the inner periphery of the annular wall and located between the supporting ledge and the annular flange, a longitudinal passage being extended through the annular flange and the stepped section;
the tabs of the inside hub being received in the notches of the outside hub, and further comprising two bolts extended through the through-holes in the inside hub and the screw holes in the outside hub;
the inside escutcheon including two diametrically disposed first lugs fittingly received in the recesses of the inside hub, respectively;
the outside escutcheon including two diametrically disposed second lugs fittingly received in the recessed sections of the outside hub, respectively;
the lock core transmission device including a sleeve connected to the lock core to rotate therewith, the sleeve having a wing plate for operative connection with the latch bolt, the lock core transmission device further including a locking piece with a neck portion, the neck portion being engaged with the outside spindle to rotate therewith, wherein the locking piece is rotatably received in a compartment defined between the arcuate supporting ledge and the arcuate stepped section when the cylindrical lock is in an unlatched status, and wherein the locking piece being longitudinally moved into the longitudinal passage when the push button is pushed, thereby rendering a latched status for the cylindrical lock;
further comprising a ring-like reinforcing plate mounted to an outer side of the outside escutcheon, the reinforcing plate including two diametrically disposed outwardly extending ears each having a positioning post for engaging with the inside escutcheon.
A tightening ring is mounted to an outer side of the reinforcing plate, the tightening ring including an inner threading for engaging with the outer threading of the outside hub. At least one of said recessed sections of the outside hub includes a scale for providing a reference to threaded engagement between the tightening ring and the outer threading of the outside hub.
The outside spindle further includes a guide member that is extended through the longitudinal passage and then rotated through an angle such that the guide member no longer aligns with the longitudinal passage, thereby preventing disengagement of the outside spindle.
The outside hub further includes two aligned second notches, the transmission assembly further includes a positioning plate securely engaged with the second notches, and a spring is provided for biasing the retractor toward the latch bolt.
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: 2795948 (1957-06-01), Rayburn
patent: 3550411 (1970-12-01), Neary
patent: 4869083 (1989-09-01), DeMarseilles et al.
patent: 4921289 (1990-05-01), Shen
patent: 5590555 (1997-01-01), Kester et al.
patent: 5605064 (1997-02-01), Katayama et al.
patent: 5761936 (1998-06-01), Katayama et al.
patent: 5845522 (1998-12-01), Shen
patent: 6151934 (2000-11-01), Chong et al.
Barrett Suzanne Dino
Kamrath Alan
Rider Bennett Egan & Arundel LLP
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