[Home] [Location] [Technical] [Geological]


Technical | Winders | South   >  Controls

Section under development

On the South winder the driver sat on a raised platform alongside the right-hand trunk guide with the main operating controls in front and the auxiliary controls, trips and resets on either side.

drivers seat a -m02

South winder driver’s seat and controls circa 1975   (FoPP/JST)

The throttle lever operated the steam valve via an ungabbing device located below floor level in the RH side foundation pit just behind the drivers chair.  The valve itself is located further to the rear and just beyond it is the main isolating 14” gate valve.

S winder ungabbing gear a -m

South winder throttle ungabbing gear circa 1975   (FoPP/JST)

DSC00312a-sMain isolating valveIsolating valve operating spindleFeed to RH cylinder inlet manifoldCross feed to LH cylinder inlet manifoldSteam valve

South winder throttle and isolating valves

Due to the weight of the reversing gear and its linkage, the drivers reversing lever does not operate the gear directly. Instead it operates via a steam reversing engine located on the RH side bed-frame just in front of the drivers chair.

S winder reversing eng a -m

South winder reversing engine  circa 1975   (FoPP/JST)

S winder governor a -s
Sth gvrnr -s02

South winder governor circa 1975   (FoPP/JST)

South winder governor under restoration

The overwind device used on the previous South winder is believed to be a Barclay’s type whilst the original winder had no device. 

The overwinder originally installed by Markhams in 1922 was a Thornwill  & Wareham ”profile” overwind/overspeed device driven via a spur gear from the depth-indicator drive shaft.  Its overspeed operation  un-gabbed the driver’s control rod at the throttle valve itself and, in addition, by altering the fulcrum of the floating linkage, brought the brake-engine into immediate operation in case of overwind.

By 1950 the Thornwill  & Wareham overwinder had been fitted with a King’s slow-banker.

By 1973 these had been replaced by a Black’s Modified Torque controller  providing sensitive and proportional protection against overwind and overspeed at all stages of the winding cycle.


1950 Sth winder controller -s

South winder controller circa 1950  Thornwill & Wareham overwind protector with a King’s slow banker   (FoPP/JST)

Black’s overwind protection utilised a long screw thread carrying a cam nut which operated a switch at either end of its travel. Overspeed protection was based upon a sensitive centrifugal governor, the weights of which travelled up a specially shaped profile.  Springs of three different strengths were used to give sensitivity within different speed ranges.   Two cam discs with different profiles were used to give alternate speed regimes when men or coal were being wound. These discs were later fitted with profile rotation protection to detect any displacement of the cams.

Blacks controller front a -s
Blacks controller rear a -s

South winder controller circa 1975    This was a Blacks Modified Torque type  and the front view (LH)  shows the overwind protection mechanism, whilst the rear view (RH) shows the men/coal cams and the change-over mechanism       (FoPP/JST)


see the mechanism of the Blacks controller


Copyright © 2005 - 2020   J S. Thatcher

Page updated on:

02 Aug, 2020


09:39:58 PM

In case of problems contact: