Locks – Special application – For closures
Reexamination Certificate
2000-03-08
2001-01-30
Gall, Lloyd A. (Department: 3627)
Locks
Special application
For closures
C070S149000, C070S218000, C292S172000, C292SDIG002
Reexamination Certificate
active
06178795
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lockable structure for a big-handle lock.
2. Description of the Related Art
Taiwan Utility Model Publication No. 122820 issued on Nov. 11, 1989 and entitled “TRANSMISSION MECHANISM FOR A BIG-HANDLE LOCK” discloses a so-called big-handle lock comprising a seat assembly and a transmission assembly. The seat assembly includes a receiving member, a press member, and a pivotal pin. The transmission assembly includes a cover plate, a push-button rod, a connecting plate, a transmission plate, a fixing button, an actuating spring, a transmission rod, and a bottom plate. The big-handle lock is mounted to a door to allow easy opening of the door, which is particularly suitable for a heavy door. When the push-button rod is pushed, the transmission rod 26 is rotated for retracting a latch bolt to allow opening of the door. Nevertheless, the big-handle lock cannot provide locking function such that an additional lockable structure is required. As a result, installation and use of the big-handle lock and the additional lockable structure are inconvenient.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a lockable structure for a big-handle lock to allow easy installation and use of the big-handle lock.
A lock in accordance with the present invention comprises:
a base plate adapted to be mounted to a door and including a first opening;
a lock core assembly mounted to the base plate and including a lock core;
a press member including a first end extended through the first opening and a second end for manual pressing;
a bottom plate mounted to the base plate and including an axle hole and a second opening through which the first end of the press member extends;
a transmission assembly comprising:
a transmission wheel rotatably mounted in the axle hole of the bottom plate and including a plurality of teeth;
an actuating plate including a rack portion for meshing with the teeth of the transmission wheel, whereby rectilinear movement of the actuating plate causes rotational movement of the transmission wheel;
a control plate operably connected to the actuating plate to move therewith, the control plate including a projection and a slot;
a press-plate including a groove for releasably engaging with the projection of the control plate, the press-plate including a hole through which the first end of the press member extends for driving the press-plate, the press-plate being moved rectilinearly when the second end of the press member is pressed;
a locking bar including a first end engaged with the lock core of the lock core assembly and a second end adapted to be engaged with a turn-button of an inner handle; and
a follower disc mounted around the locking bar to rotate therewith, the follower disc including a cam for bearing against a wall defining a portion of the slot of the control plate; and
a cover plate engaged with the bottom plate and including a lock core hole through which a key is inserted to drive the lock core, the cover plate including a third opening through which the second end of the press member extends.
The bottom plate includes two pin-receiving holes located on two sides of the first opening, respectively. The pin-receiving holes receive a pin about which the press member pivots. The base plate includes two protrusions for restraining movement of the press-plate between the protrusions. The actuating plate of the transmission assembly includes a second slot and the control plate includes a block engaged in the second slot to allow joint movement of the actuating plate and the control plate. The second slot of the actuating plate includes a narrower section and a wider section, whereby rotational movement of the control plate causes released or fitted engagement between the second slot and the block of the control plate. An elastic means is provided for biasing the press-plate to return to a predetermined position.
In an embodiment of the invention, the follower disc includes a flange with a non-circular shape having two reduced diameter portions, and an elastic member has two ends attached to the reduced diameter portions, respectively. In an alternative embodiment of the invention, the follower disc includes a flange with two symmetric opposite straight sides, and an elastic member has two ends attached to the symmetric opposite straight sides, respectively.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2266106 (1941-12-01), Voight et al.
patent: 4052092 (1977-10-01), Bergen
patent: 4725085 (1988-02-01), Hu et al.
patent: 5060991 (1991-10-01), Davidian et al.
patent: 5123683 (1992-06-01), Solovieff
patent: 5513510 (1996-05-01), Solovieff et al.
patent: 5570916 (1996-11-01), Mader
patent: 5611227 (1997-03-01), Solovieff
patent: 122820 (1989-11-01), None
Bacon & Thomas PLLC
Gall Lloyd A.
Taiwan Fu Hsing Industrial Co., Ltd.
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