Neilau wrote:Does anyone know anything about or have examples of coin operated locks.?
Like the type used on pay toilets etc.
"Spend a penny"
Maskelyne (indeed, of the family of magicians) was one patentee of 'automatic locks'. Seems to have been some coyness about calling them coin-operated, in view of their early use.
There were several makers, Lockerbie & Wilkins being one of the main makers, ETAS and Union also made them. Over the years, they were made not only for 1d, but also for ¼d and ½d, although 1d is most common.
Typically, there is a lever lock on the coin box, and a warded key to open the latch from outside without a coin. Some also have a front cover over the mechanism which is removable for service, and locked by a small lever lock. Otherwise, a jammed lock has to be removed from the door.
Most of these were removed and junked either at decimalisation, or later with other coinage changes. The locks weigh a hefty amount of good brass! although some are also nickel-plated.