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Inventor: Paul Maxwell-King
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About Paul Maxwell-King - see linkedin

JIB approved Installation Electrician, Electrical Fitter, Distribution Networks Electrician and Building controls engineer.
Industry Assessed, completed an 4 year apprenticeship and I.E.E. (The Institution of Engineering and Technology) Wiring Regulations 17th Edition.(also 15th and 16th before this)

I have been in the electrical industry for over 33 years.

Application Number GB1100244.1
Publication Number: GB2487080

Date of filling: 9th January 2011
Date of publication: 11th July 2012
Date Patent/Invention Granted: 30th April 2013

Espacenet Patent Search
Journal Number 6425
To download document click HERE

Abstract of  GB2487080 - A three-pin BS1363 plug has a lockable earth pin. After it is plugged into a socket, a plastic disc (Fig 1.1) is rotated, moving a plunger. The plunger may be biased with a spring (Fig 1) or connected to the disc. Moving the plunger pushes out two pins to lock the earth pin in the socket. If one pin is prevented from being pushed out, a spring arrangement (Fig 8.5) may nevertheless push out the other. The plug may be supplied with an adaptor (Fig 3) that goes between the plug and the socket and covers the sockets switch, so that the switch on the socket cannot be switched off while the plug is in place.

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