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US 4,053,939 AGranted
Electric lock system
AssigneeKokusai Gijutsu Kaihatsu Kabushiki Kaisha
InventorsShunsaku Nakauchi, Akifusa Takahashi
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AssigneeKokusai Gijutsu Kaihatsu Kabushiki Kaisha
InventorsShunsaku Nakauchi, Akifusa Takahashi
Estimating the term…
An electric lock system is disclosed comprising an electro-mechanical lock device including a pair of current terminals and a self-sustaining solenoid circuit, a control device including a pair of current terminals, at least one d.c. current source and means for changing the direction of the d.c. current. The electro-mechanical lock device is put in a locking condition and an unlocking condition according to the application of the d.c. current supplied thereto from the control device through the lead wires and these conditions are detected in the control device via the same lead wires.
An electro-mechanical lock system comprising, a latch, a pair of supply terminals adapted to be connected to a source of remote power, a self-sustaining solenoid having a coil and a core, said core having two self-sustaining positions locking and unlocking said latch respectively, and said coil being connected to receive power supplied to said pair of supply terminals, impedance changing means connected in circuit with said pair of terminals and said coil for altering the impedance between said pair of terminals when said core moves from one self-sustaining position to another self-sustaining position, a remote control circuit including at least one power source and one measuring device, said remote control circuit being connected to said pair of terminals by a pair of wires.
An electro-mechanical lock system comprising, a latching means, a self-sustaining solenoid having a core and a coil and being adapted to be switched between a first self-sustaining position wherein said core locks said latch and a second self-sustaining position wherein said core does not lock said latch, a pair of supply terminals adapted to be connected to a remote control device, an impedance connected in series with said coil, said series connection connected at opposite ends thereof to said two supply terminals respectively, means, including a pair of oppositely connected diodes and a switch, for selectively connecting said diodes in parallel with said impedance, said last mentioned means being responsive to the position of said core, a pair of wires connected respectively to said two supply terminals, a remote control circuit connected to the other ends of said two wires, said remote control circuit comprising at least one power source and switch means connected thereto to selectively supply voltage of first and second polarity to said two supply terminals, said voltage being sufficient to cause said core to move from either self-sustaining position to the other self-sustaining position, said diodes and said switch being connected in the circuit and responsive to the core position to cause said impedance to be short circuited only for a short period following reversal of the polarity of said voltage, and wherein said remote circuit also includes a measuring means for measuring the current in said pair of wires.
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
Controlling mechanically-operated bolts by electro-magnetically-operated detents: the detent moving rectilinearly
Operating means: motor
Locks
Technical subjects covered by former us classification
Term ended 11 Oct 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to an electric lock system and, particularly, to an electric lock system in which the locking operation is controlled and monitored by an electric signal.
In the past, in order to control an electric lock device, a detector which operates upon conditions such as the opening and closing of a door and locking and unlocking of the lock device is provided for each lock device. The detector is usually connected to a control panel installed remotely therefrom through a plurality of lead wires and, in addition, a plurality of lead wires are required to supply electric power for driving a solenoid of the electric lock device. Therefore, the total number of lead wires required for each lock device is relatively large.
For example, an electric lock system disclosed in Japanese utility model publication No. 6877/1966 requires three lead wires between a lock device and an indicator. Another electric lock system, disclosed in Japanese Patent Publication Nos. 21184/1967 and 21186/1967, also requires three lead wires. Further, a lock system disclosed in Japanese Utility Model Disclosure No. 12294/1973 requires five lead wires between the lock device and control panel.
FIG. 1 is a schematic illustration of an electro-mechanical lock device of the present invention,
FIG. 2 is a circuit diagram incorporated in the electro-mechanical lock device in FIG. 1,
FIG. 3 is a circuit diagram of the present lock system,
FIG. 1 shows schematically a lock device according to the present invention. The lock device comprises a mechanical lock mechanism and an electric driving circuit. The mechanical lock mechanism includes a casing 1, a latch seat 2 which is mounted on a door or an associated stud, a latch 3, a latch biasing spring 3', a movable core element 5 and a connecting rod 7. The driving circuit includes a self-sustaining solenoid 4 associated with the movable core element 5, a single pole-double throw snap switch 6 linked via connecting rod 7 to movable element 5, diodes 8 and 9, a resistor 10 and a switch 11 to be opened and closed upon opening and closing of the door.
As illustrated schematically in FIG. 2, the self-sustaining solenoid 4, which is composed of a magnetizing coil 12, holds the movable core element 5 in an upper or a lower stable position depending upon the direction of electric current flowing through the magnetizing coil 12. A solenoid coil of the self sustaining type is used wherein the core is held in its stable positions thru the aid of permanent magnets and therefore a much smaller coil current is used during holding operations. However a relatively large current is needed to switch the core from either stable position to the opposite stable position. The construction and characteristics of such self-sustaining solenoid devices per se is well known in the art.
When the movable core element 5 is held in the upper stable position as shown by the solid line in FIG. 1, the lateral movement of the latch 3 is blocked and the lock device is in a locked state. When the movable core element 5 is held in the lower stable position as shown by the dotted line in FIG. 1, the latch 3 is permitted to more rightwardly to thereby unlock the lock device. Of course a bolt may be substituted for the latch 3.