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Happynak Construction Sets

Happynak is a simple construction system consisting of tubes pushed into connectors. It was made in the UK from 1914 to at least 1922.

Manufacturer / Distributor

Paton, Calvert & Co. Ltd., Binns Road, Old Swan, Liverpool

Info from the Metal Constructional Systems Database for HAPPYNAK

System Type
Mainly Rods/Tubes
United Kingdom
1914 to known in 1922 (see comment *1)
Boss Type
no boss
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
Hole Pitch (Spacing) (mm)
6.35 (see comment *2)
Diameter of holes in Strips(mm)
2.0 (see comment *3)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
2 (approximately) (probably)
Types of Nuts and Bolts
Nuts: --
Bolts: --
Material/Finish of Nuts and Bolts
--  --
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Tubes push into Joints with split sockets, & are used as axles. *1 Not listed in 1929. *2*3 only in Perforated Tubes; similar size holes in some Joints.

The MCS document for this system is shown below. It can also be downloaded to your computer if desired here

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The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided

There are currently no manuals, leaflets or photos etc. available for downloading. If you can supply any, please get in contact with me.