GB2186623A - Electrical lock - Google Patents

Abstract

An electrical lock comprises two cooperating latches 3,6 pivotable on a common spindle 32 and received within a slot in the lock in which a first leaf spring 41, a second leaf spring 4 and a micro-switch 5 are also installed in the slot so that when a locking tongue located for example on a door, engages a latch in the slot, the micro-switch is actuated to illuminate a display device alarm, and when the locking tongue separates from the latch the display device indicates the locking condition of the lock. <IMAGE>

Description

SPECIFICATION Electrical lock The present invention relates to an electrical lock.

According to the present invention there is provided an electrical lock having two cooperating latches formed upon a common spindle and received within a slot in the lock in which a first leaf spring, a second leaf spring and a micro-switch are additionally installed in the slot so that when a locking tongue located for example on a door engages a latch in the slot of said lock, the micro-switch is activated to transmit an instruction to a display device (such as indicating light or burglar alarm), and when the locking tongue separates from the lock, a further instruction is transmitted to the display device to display the locking condition of the lock.

The invention will now be described further by way of example with reference to the accompanying drawings in which: Figure 1 is a perspective view of a lock in accordance with a preferred embodiment of the invention; Figure 2 is an exploded view of the lock shown in Fig. 1; Figure 3 is a diagrammatic view of part of the electrical arrangement, for the locks shown in Figs. 1 and 2 in a first condition; and Figure 4 is a view corresponding to that of Fig. 3 but with the lock in a second condition.

The lock shown in Figs. 1 and 2, is fixed to a fixed article such as a door frame. The lock includes a pivotally mounted latch to be converted to an electrical signal through a plastics leaf spring 41, a leaf spring 4 and a microswitch 5.

The lock has a casing 1 to one internal end of which are secured two solenoids 71. Actuation of the solenoids causes a pivotally mounted lever 8 to rotate in an anti-clockwise direction, as viewed in Figs. 1 and 2, thus unlatching a further lever 9 which can then rotate in a clockwise direction, as viewed.

Pivotally mounted latches 3,6 include an axial bore 31 and, are mounted upon a common spindle 32 received in the bore 3, within a slot 2 of the casing 1. The latch 3 is received within a cut-out of the latch 6 and its front end is chamfered. The latch 3 can pivot and a tongue 12 which extends from the rear end thereof lies beneath the plastics leaf spring 41 and the leaf spring 4 which is disposed between the plastics leaf spring 41 and the microswitch 5. A lock condition indicating light or burglar alarm device is connected to the micro-switch 5 through appropriate wiring and a power source so as to form a linking mechanism analogous to a lever.

Figs. 3 and 4 show the sequence of operations when the door is closed. The locking tongue thereon first engages the latch 3 to pivot it downwardly in an arced manner. The tongue 12 on the latch 3 moves upward to ram against one end of the plastics leaf spring 41 which rises up to lift the leaf spring 4. At the same time, the leaf spring 4 lifts to trigger the micro-switch 5 which can close or cut off the power supply (depending on the present status). When this instruction "ON" or "OFF" is transmitted to the lock condition indicating light or burglar arm for action, the locking or unlocking condition of door lock can be seen.

When the door is opened the actions involved are the opposite to those mentioned above; the locking tongue on the door separates from the latch 3 on the lock casing 1, the elastic force of leaf spring 4 causes the plastics leaf spring 41 and the latch 3 to restore to their original state of imposing no force on them, another instruction is transmitted to the micro-switch 5 and thence to the lock condition indicating light or burglar alarm to indicate the state of opening the door.

It will be seen that the invention provides a lock having a lock condition display lamp and which can be further connected to a burglar alarm.

Various modifications and changes may be made by those skilled in this art without departing from the scope of this invention as set out in the appended claims.

1. An electrical lock having two cooperating latches formed upon a common spindle and received within a slot in the lock in which a first leaf spring, a second leaf spring and a micro-switch are additionally installed in the slot so that when a locking tongue located for example on a door engages a latch in the slot of said lock, the micro-switch is activated to transmit an instruction to a display device (such as indicating light or burglar alarm), and when the locking tongue separates from the lock, a further instruction is transmitted to the display device to display the locking condition of the lock.

2. An electrical lock substantially as herein described with reference to and as illustrated in any one of the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (2)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Electrical lock The present invention relates to an electrical lock. According to the present invention there is provided an electrical lock having two cooperating latches formed upon a common spindle and received within a slot in the lock in which a first leaf spring, a second leaf spring and a micro-switch are additionally installed in the slot so that when a locking tongue located for example on a door engages a latch in the slot of said lock, the micro-switch is activated to transmit an instruction to a display device (such as indicating light or burglar alarm), and when the locking tongue separates from the lock, a further instruction is transmitted to the display device to display the locking condition of the lock. The invention will now be described further by way of example with reference to the accompanying drawings in which: Figure 1 is a perspective view of a lock in accordance with a preferred embodiment of the invention; Figure 2 is an exploded view of the lock shown in Fig. 1; Figure 3 is a diagrammatic view of part of the electrical arrangement, for the locks shown in Figs. 1 and 2 in a first condition; and Figure 4 is a view corresponding to that of Fig. 3 but with the lock in a second condition. The lock shown in Figs. 1 and 2, is fixed to a fixed article such as a door frame. The lock includes a pivotally mounted latch to be converted to an electrical signal through a plastics leaf spring 41, a leaf spring 4 and a microswitch 5. The lock has a casing 1 to one internal end of which are secured two solenoids 71. Actuation of the solenoids causes a pivotally mounted lever 8 to rotate in an anti-clockwise direction, as viewed in Figs. 1 and 2, thus unlatching a further lever 9 which can then rotate in a clockwise direction, as viewed. Pivotally mounted latches 3,6 include an axial bore 31 and, are mounted upon a common spindle 32 received in the bore 3, within a slot 2 of the casing 1. The latch 3 is received within a cut-out of the latch 6 and its front end is chamfered. The latch 3 can pivot and a tongue 12 which extends from the rear end thereof lies beneath the plastics leaf spring 41 and the leaf spring 4 which is disposed between the plastics leaf spring 41 and the microswitch 5. A lock condition indicating light or burglar alarm device is connected to the micro-switch 5 through appropriate wiring and a power source so as to form a linking mechanism analogous to a lever. Figs. 3 and 4 show the sequence of operations when the door is closed. The locking tongue thereon first engages the latch 3 to pivot it downwardly in an arced manner. The tongue 12 on the latch 3 moves upward to ram against one end of the plastics leaf spring 41 which rises up to lift the leaf spring 4. At the same time, the leaf spring 4 lifts to trigger the micro-switch 5 which can close or cut off the power supply (depending on the present status). When this instruction "ON" or "OFF" is transmitted to the lock condition indicating light or burglar arm for action, the locking or unlocking condition of door lock can be seen. When the door is opened the actions involved are the opposite to those mentioned above; the locking tongue on the door separates from the latch 3 on the lock casing 1, the elastic force of leaf spring 4 causes the plastics leaf spring 41 and the latch 3 to restore to their original state of imposing no force on them, another instruction is transmitted to the micro-switch 5 and thence to the lock condition indicating light or burglar alarm to indicate the state of opening the door. It will be seen that the invention provides a lock having a lock condition display lamp and which can be further connected to a burglar alarm. Various modifications and changes may be made by those skilled in this art without departing from the scope of this invention as set out in the appended claims. CLAIMS

1. An electrical lock having two cooperating latches formed upon a common spindle and received within a slot in the lock in which a first leaf spring, a second leaf spring and a micro-switch are additionally installed in the slot so that when a locking tongue located for example on a door engages a latch in the slot of said lock, the micro-switch is activated to transmit an instruction to a display device (such as indicating light or burglar alarm), and when the locking tongue separates from the lock, a further instruction is transmitted to the display device to display the locking condition of the lock.

2. An electrical lock substantially as herein described with reference to and as illustrated in any one of the accompanying drawings.