Locking and unlocking tool boxes and tool cabinets

1. A lock conversion kit adapted to be fitted to a tool box that already has a locking mechanism pre-fitted to the tool box as supplied and operable by a main locking unit also pre-fitted to the tool box as supplied, said locking mechanism having a locked condition preventing access to tools within said tool box, and an unlocked condition allowing access to tools within said tool box, the lock conversion kit comprising:

an electric motor, the motor having a rotor; and

a microprocessor and control circuit, coupled to the motor for controlling the motor, and configured to receive Bluetooth signals when paired to a user's portable Bluetooth-enabled mobile device, the microprocessor and control circuit being effective, when the user's portable Bluetooth-enabled mobile device is sufficiently close to the control circuit to be detected, to energise the motor to rotate the rotor in a first sense, effective to disable the locking mechanism to allow access to said tools,

wherein the lock conversion kit, when fitted to the tool box, is configured to engage said locking mechanism and is configured to over-ride the operation of said main locking unit.

2. A lock conversion kit according to claim 1 , wherein the microprocessor is effective, when a previously detected user's portable Bluetooth-enabled mobile device is no longer detected, to energise the motor to rotate the rotor in the opposite sense, to cause the locking mechanism to return to a locked condition.

3. A lock conversion kit according to claim 1 , wherein the microprocessor is effective, when a previously detected user's portable Bluetooth-enabled mobile device is no longer detected, to disengage the rotor from the disabled locking mechanism, allowing the locking mechanism to return to a locked condition.

4. A lock conversion kit according to claim 1 , in combination with the tool box, wherein the tool box is of the kind in which individual drawers for holding tools are slidable generally horizontally in and out of the tool box, each said drawer having a front and rear end and being formed with or provided with a hook at the rear end, and wherein the locking mechanism comprises at least one lock bar mounted on a rear wall of the tool box, the lock bar being slidable vertically between a lower position in which it is adapted to prevent passage of said hook through a corresponding opening in the lock bar, thereby preventing sliding of the drawer, and a raised position in which passage of said hook through said opening is allowed, so that the drawer is slidable out of the tool box, and the lock conversion kit comprises a pawl-and-ratchet mechanism that serves to raise and lower the lock bar.

5. A lock conversion kit and tool box combination according to claim 4 , wherein a pawl of the pawl-and-ratchet mechanism is mounted on the rotor, and the ratchet is mounted on a horizontally slidable member, whereby rotation of the rotor in said first sense causes horizontal linear motion of the slidable member to cause a camming action of the member against a vertically movable member coupled to the lock bar, thereby causing the vertically movable member to move the lock bar to its raised position, and rotation of the rotor in the opposite sense from an unlocked condition causes horizontal liner motion of the slidable member to disengage the camming action and allow the lock bar to return to its lower position under gravity.

6. A lock conversion kit and tool box combination according to claim 4 , wherein a pawl of the pawl-and-ratchet mechanism is mounted on the rotor, and the ratchet is mounted on a vertically slidable member, whereby rotation of the rotor in said first sense causes vertical linear motion of the slidable member to directly push the lock bar or a mechanism linked to the lock bar in a direction to raise the lock bar, and rotation of the rotor in the opposite sense from an unlocked condition causes vertically downwards liner motion of the slidable member to allow the lock bar to return to its lower position under gravity.

7. A lock conversion kit and tool box combination according to claim 4 , wherein there are a plurality of lock bars mounted on the rear wall of the tool box, linked by a mechanism so that all of the lock bars are raised together to their raised position.

8. A lock conversion and tool box combination according to claim 7 , wherein a link mechanism couples the upper ends of the respective lock bars so that they rise and fall together, a pawl of a pawl-and-ratchet mechanism is mounted on the rotor, and the ratchet is mounted on a vertically slidable member positioned to engage the link mechanism from below, whereby rotation of the rotor in said first sense causes vertical linear motion of the slidable member to engage the link mechanism and raise the lock bars together to their raised position, and rotation of the rotor in the opposite sense from an unlocked condition causes vertically downwards linear motion of the slidable member to allow the lock bars to return to their lower positions under gravity.

9. A lock conversion kit according to claim 1 , wherein the electric motor and microprocessor are adapted to be engaged with to the existing locking mechanism of the tool box without permanent fixings.

10. A lock conversion kit and tool box combination according to claim 5 , wherein the tool box has an inside bottom surface, wherein a pair of angle irons, each comprising a first flange coupled to a second flange at a right-angle to the first, are mounted to the rear wall of the tool box by their first flanges, and the lock bar is vertically slidable between the respective second flanges of the angle irons which act together as a pair of guide rails for the lock bar; and the conversion kit comprising the electric motor and microprocessor being located in position on the inside bottom surface of the tool box by two fingers of said kit that form a push fit outwardly of the respective guide rails.

11. A lock conversion kit and tool box combination according to claim 7 , wherein the tool box has vertical banks of drawers with space between the vertical banks; and the conversion kit being adapted to fit against the rear wall of the tool box between the vertical banks, and comprising a vertically moveable lifting arm positioned to engage either one of the lock bars or the linking mechanism.