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Tri-Sector

Tri-Sector was a simple construction system, using left and right hand triangular flanged triangular plates. It was made in the UK in circa 1921.


Manufacturer / Distributor

The Hobran Engineering Co. Ltd., Shelsley Works, Wolverhampton, UK


Info from the Metal Constructional Systems Database for TRI-SECTOR

Maker
 
System Type
Non-Meccano type
Country
United Kingdom
Dates
1921
Material
Steel
Thread
 
Boss Type
 
Boss Thread
 
Diametrical Pitch of Gears
--
No. of Parts in System
10 (some significant doubt)
Hole Pitch (Spacing) (mm)
31.8 (see comment *1)
Diameter of holes in Strips(mm)
4.7 (see comment *2)
Diameter of the Bore in Bosses(mm)
 
Diameter of Axle Rods(mm)
 
Types of Nuts and Bolts
Nuts:
Bolts:
Material/Finish of Nuts and Bolts
 
Size of the Nuts across Flats (mm)
Bolt diameter (mm)
 

Comments
The only structural parts are right hand & left hand Flanged Triangles, 2½x3¾". Known from 1921 ads. May have been short lived. *1 1¼". *2 In the Flanged Triangles.

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

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