Hampshire Mills Group
HOME
Up
MILLS BOOK
MILLS OPEN
LIBRARY
LISTED MILLS
MILL HISTORY
HMG ACTIVITY
NEWSLETTERS
SNIPPETS
MILLS OVERSEAS
CONTACT
LINKS

 

 

Back Up Next

Page 4

Newsletter 110, Autumn 2015  © Hampshire Mills Group


 

A Cone Clutch in a South African Mill

 

Nigel Harris

 

I thought readers of HMG Newsletter might be interested in an elegant mechanism I came across for engaging and disengaging runner stones in a stoneground flour mill in South Africa. It must represent an example of the peak of German mill engineering in the late 19th century.

The mill concerned is at Reichenau Mission, Underberg, Natal. The mill machinery was manufactured by Ferdinand Strauss of Germany and commissioned in 1896. There are two sets of millstones both driven off the same drive shaft. A large cone clutch on each stone spindle allows the runner stone to be individually engaged and disengaged from the drive without the need to disconnect the belt. 

The clutch consists of two conical surfaces brought together to transmit torque by friction. A male cone, covered in sections of friction material (see picture A), is keyed to the runner stone spindle but is movable (by handwheell operation) in the vertical plane. Inside the large-belt driven pulley (see pictures B and C), is a mating female cone. The female cone/pulley freewheels on a thrust bearing supported by a shoulder on the vertical shaft. By adjustment of the handwheel the male cone can thus be made to engage with the female cone, which in turn will cause the runner stone to rotate.

The pictures and information are supplied with thanks to Peter Frow, and I am also indebted to the Diocese of Mariannhill, Reichenau for their assistance.

This article first appeared in SPAB “Mill News” in July 2014

 

 

Picture A

 

Picture B

 

 

Picture C

 

Back Up Next

 


HOME ] Up ] MILLS BOOK ] MILLS OPEN ] LIBRARY ] LISTED MILLS ] MILL HISTORY ] HMG ACTIVITY ] NEWSLETTERS ] SNIPPETS ] MILLS OVERSEAS ] CONTACT ] LINKS ]

horizontal rule

Copyright © 2017 Hampshire Mills Group
Registered as a Charity - 1116607