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Bob(1) Construction Sets

Bob(1) was a construction system using rods and plates and was made in the UK. Very similar systems were also made in France (Bob(2)) and Switzerland (Bob(3)), with each country having a slightly different system. It was produced in the UK from around 1946 to 1949.

Manufacturer / Distributor

Ridingbery and Co. Ltd., Feeder Road, Bristol 2, UK
Distributed by G. Greiner & Co., 23 City Road, London, E.C., UK

Info from the Metal Constructional Systems Database for BOB [1]

System Type
Mainly Rods/Tubes
United Kingdom
circa 1946 to 1949
Steel / Aluminium (Alloy)
Boss Type
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
Hole Pitch (Spacing) (mm)
12.7 (multiples of value shown, including half.)
Diameter of holes in Strips(mm)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
Types of Nuts and Bolts
Nuts: --
Bolts: cheese (slotted)
(see comment *1)
Material/Finish of Nuts and Bolts
Brass with a Brass finish
(see comment *2)
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Steel Rods, aluminium Pulleys & Plates. Joints marked PATENT & G.Ni.K. Much like BOB2 & BOB3 except plating. *1*2 In Joint; in boss: Roundhead plain brass, Bolt Head Diameter=5.6.

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

Below there are manuals/leaflets which can be downloaded by clicking on the appropriate image.

A Bob(1) instruction manual.

Photos of a Bob(1) set.