GB2107381A

GB2107381A - Remote controlled lock

Info

Publication number: GB2107381A
Application number: GB08129161A
Authority: GB
Inventors: William Frederick Isbell
Original assignee: Individual
Current assignee: Individual
Priority date: 1981-09-26
Filing date: 1981-09-26
Publication date: 1983-04-27

Abstract

A lock operated by two solenoids, one to open one to close the lock. The solenoids are only activated during the locking or unlocking operation, thus avoiding overheating and noise problems. To ensure secure locking devices are fitted indicating to the operator correct operation.

Description

SPECIFICATION Remote controlled lock for applications where the lock positions need to be held for a long time Solenoid controlled locks are common but are made to remain closed by spring pressure and only opened for short periods to allow the passage of people, goods etc. In some cases, e.g. Post Offices, Building Societys, the lock has to be in the opened or closed position for some hours and the locks already marketed give noise and heating problems under these conditions.

The lock which is the subject of this application, is used in conjunction with a door closure device and consists of a rim type lock or bolt or other securing device controlled by two solenoids (probably arranged linearly), one solenoid to open and the other to close the securing device. In order to avoid the overheating and noise problems mentioned above the electricity is only allowed to flow for a short time by means of switches operating a circuit which only allows a predetermined period of current flow. A further safety device is provided by means of a thermistor so that in the event of a short circuit the amount of current is limited and overheating will not occur.

The device may operate remotely e.g. from behind a security screen and also adjacently, possibly by means of a key switch, for use when entering or leaving the premises by the door which has the device attached to it.

As the lock is free to move except when being operated it is necessary to have some means e.g.

small permanent magnets to maintain the lock in the position last operated, to prevent accidental engagementor disengagement by vibration etc.

Since the distance from which the lock is remotely operated may be greater than that at which correct operation can be seen, it is desirable for an indication to be made that the lock has operated correctly and that the door is actually in the locked state, this may be done by transducers in the 'keeper' of the device and at any other convenient point.

1. A remotely operated locking device which avoids noise and overheating problems and is substantially tamperproof.

2. A device as in 1 so designed that the operator is informed of correct operation.

3. A device as in 1 so designed that the operator is alerted if any tampering has occurred.

4. A device as in 1 which can be mounted in an inaccesible position and comply with fire regulations.

5. A device as in 1 so designed that the operator does not have to leave the secure area in case of power failure.

6. A device as in 1 which can be readily adjusted to deal with 'gapped' and distorted doors and frames.

7. A device as in 1 which can use smaller solenoids as they need not be continuously rated.

8. A device as in 1 which is not so affected by shock and vibration as are usual solenoid operated locks.

9. A device as in 1 which can easily have a visual display showing the state of the lock visible under strong light conditions.

10. A device as in 1 which can have a small battery standby system as no current is required except under operation.

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Remote controlled lock for applications where the lock positions need to be held for a long time Solenoid controlled locks are common but are made to remain closed by spring pressure and only opened for short periods to allow the passage of people, goods etc. In some cases, e.g. Post Offices, Building Societys, the lock has to be in the opened or closed position for some hours and the locks already marketed give noise and heating problems under these conditions. The lock which is the subject of this application, is used in conjunction with a door closure device and consists of a rim type lock or bolt or other securing device controlled by two solenoids (probably arranged linearly), one solenoid to open and the other to close the securing device. In order to avoid the overheating and noise problems mentioned above the electricity is only allowed to flow for a short time by means of switches operating a circuit which only allows a predetermined period of current flow. A further safety device is provided by means of a thermistor so that in the event of a short circuit the amount of current is limited and overheating will not occur. The device may operate remotely e.g. from behind a security screen and also adjacently, possibly by means of a key switch, for use when entering or leaving the premises by the door which has the device attached to it. As the lock is free to move except when being operated it is necessary to have some means e.g. small permanent magnets to maintain the lock in the position last operated, to prevent accidental engagementor disengagement by vibration etc. Since the distance from which the lock is remotely operated may be greater than that at which correct operation can be seen, it is desirable for an indication to be made that the lock has operated correctly and that the door is actually in the locked state, this may be done by transducers in the 'keeper' of the device and at any other convenient point. CLAIMS