Locks – Special application – For control and machine elements
Reexamination Certificate
1999-03-12
2001-09-11
Gall, Lloyd A. (Department: 3627)
Locks
Special application
For control and machine elements
C070S218000, C070S276000, C070S361000, C070S387000
Reexamination Certificate
active
06286345
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a card locking device, particularly, to a card key operated locking device which can be unlocked one time if a card key has been inserted into a card slot, moved an actuator to an unlocked position and the card key has been moved from the card slot.
2. Discussion of Related Art
A recent technology for a card key locking mechanism is disclosed in detail in Korean Patent Application Publication No. 7221/1990, which is priority-claimed with U.S. application Ser. No. 837,528 filed on Mar. 7, 1986.
A conventional card key locking device(card key door lock), which is currently commercialized, is constructed as shown in
FIGS. 1
to
3
. An actuator
12
is installed to be movable by a predetermined distance relative to a fixed frame
11
if a card key
10
is inserted into a key slot and is then pushed. If the actuator
12
has been moved down, an impeller
8
which is formed as a unitary body with the actuator
12
pulls a coupling spring
9
in such a manner that a coupling shaft
7
couples two spline shafts
6
and
6
′, thus coupled with each other. At this time, if a handle grip
5
is turned, a keeper which is coupled with the spline shaft
6
′ operates to thereby lock or unlock a door.
To prevent the actuator
12
from being returned to the original position (also known as the normal position or the locked position) thereof by the elasticity of a restoring spring
13
, even if the force applied on the card key
10
is removed after the card key
10
is inserted and pushed, installation of both a hook cam
4
and a restriction spring
3
are needed. In this case, if the card key
10
is extracted from the key slot, the coupling of the hook cam
4
with the restriction spring
3
is released in such a manner that the actuator
12
is restored to the original position thereof by the elasticity of the restoring spring
13
.
Under the construction as discussed above, the conventional card locking device operator should turn the handle grip
5
, without delay, to lock or unlock the door, after the card key
10
is inserted into the key slot and the force applied on the card key is in a card key insertion direction to thus move the actuator
12
.
If the card key
10
is extracted from the key slot before the handle grip
5
is turned, the handle grip
5
can not be turned. Sometimes a user leaves a card key in the card slot, and without extracting the key the user enters into a room.
SUMMARY OF THE INVENTION
The present invention is directed to a card locking device that substantially obviates the problems due to limitations and disadvantages of the related arts.
An object of the invention is to provide a card locking device where, when a card key is removed from a key slot after the card key is inserted into a key slot and an actuator is thus moved to the unlocked position, the actuator is not restored to the original position without one time performing an unlocking operation. Thus even if the card key is extracted from the key slot after insertion, a handle grip can be turned only one time, so a door is unlocked or locked at one time. Even when the card key is extracted prior to the turning of the handle grip, the handle grip can be turned one time, without re-insertion of the card key.
Another object of the present invention is to provide a card key locking device which has a mechanism so that an unlocking coupling securely is decoupled to a locking position.
According to an aspect of the present invention, there is provided a card locking device including: a flange provided on an end portion of the one side of the actuator; a keeper for locking the flange for preventing the actuator from returning to the original position thereof, when the actuator has been moved by insertion of a card key; and a releasing projection rotated with the rotating shaft and for pushing the keeper to a releasing position in order to return the actuator to the original position, whereby the card key moves the actuator for the rotating shaft to be coupled in operation condition, then the actuator is held in the locked state by the keeper even though the card key is extracted from the card slot unless the rotating shaft finishes its rotation of a predetermined angle.
According to another aspect of the present invention, there is provided a card locking device including: a plunger inserted in a plunger box installed on a lower end portion of the actuator and being supported by a spring; a locking protrusion formed on the fixed frame, for locking the plunger when the actuator is downward over a predetermined distance; a releasing projection rotated with the rotating shaft and for pushing the plunger to a releasing position in order to return the actuator to the original position, whereby the card key moves the actuator for the rotating shaft to be coupled in operation condition, then the actuator is held in the locked state by the plunger even though the card key is extracted from the card slot unless the rotating shaft finishes its rotation of a predetermined angle.
The present invention includes a feature that the keeper comprises a plate spring which is attached on the fixed frame, and has a locking protrusion for locking the flange of the actuator.
The present invention includes a feature that the releasing projection is formed unitary on the rotating shaft or the releasing projection is a circular plate shape fixed to the rotating shaft, having the edge-inclined protruding and reentrant portions, the protruding portion of the releasing projection adapted to push the keeper or the plunger to be separated from the flange or the locking protrusion, and the reentrant portion thereof adapted to have the keeper or the plunger returned to the locking position, if the rotating shaft is rotated to the original position thereof.
The present invention includes a further feature of comprising a pushing portion formed on end of the actuator for pushing a coupling spring when the actuator is returning from the locked state by the keeper to the original position.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 2593573 (1952-04-01), Kulbersh
patent: 2704934 (1955-03-01), Nilsson
patent: 2732703 (1956-01-01), Noregaard
patent: 3271983 (1966-09-01), Schlage
patent: 4475364 (1984-10-01), Frank
patent: 4676083 (1987-06-01), Sedley et al.
patent: 5291766 (1994-03-01), Eisermann
patent: 5339661 (1994-08-01), Eisermann
patent: 5469723 (1995-11-01), Litwin et al.
patent: 5653134 (1997-08-01), Lee et al.
patent: 2123850 (1972-11-01), None
patent: 1188747 (1970-04-01), None
Jang Dong-Jun
Kim Jeong-Wuk
Kim Seok-Jin
Gall Lloyd A.
New Taecor Co., Ltd.
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