This next floor spring is known as a Gibbons, it was invented by Paul E Gibbons and was sold by James Gibbons Format Ltd. It went through a series of slight changes mainly centred around adaptations to the way it could be adjusted. In its final guise it had the capability to be adjusted both transversely and longitudinally by means of the external screw adjustment fixed to the front of the casing.
This is a picture of single action NOS Gibbons floor spring including cement box.
This is a Gibbons double action floor spring without the adjustment screw.
In the final photograph of the Gibbons you can clearly see the adjustment screws which make this floor spring extremely easy to set up once the pin height has been set.
The patent for the Gibbons was applied for in 1955 and was granted in 1958.
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