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Posts Tagged ‘Electromagnet uncoupling’

Following the success of the installation of a ‘Dingham’ electromagnet for uncoupling the box van delivering spare parts to the shed stores siding as detailed in my Controlling Interests #6 post, I have now added an additional Dingham’ electromagnet  for also uncoupling the ash wagon next to the workers clearing the ashpits.

the ash wagon is moved into position next to the workers for the removal of the ash

the ash wagon is moved into position next to the workers for the removal of the ash

As with the box van I have added  a short piece of iron wire fixed to the dropper of the tension lock coupling hook of the ash wagon, and installed the ‘Dingham’ electromagnet by simply self threading the 5mm core bolt of the Dingham’ electromagnet  into an interference hole drilled through the ash pit into the baseboard. The head of the bolt within the ash pit itself has been covered with ash keeping it totally invisible from view.  A simple push to make switch on the control panel provides the required 12v DC for the magnet to operate that pulls down the iron wire dropper that lifts the hook for uncoupling.

This latest modification is ready to operated next weekend when Fisherton Sarum will be returning to its spiritual home, Salisbury, to be exhibited at the Salisbury and South Wilts Railway Societies 50th Anniversary exhibition.  
The exhibition is being held  at the Michael Herbert Hall, South Street, Wilton and being their golden anniversary should hopefully be a special event. It is open to the public 10.30am to 4.30pm on the Saturday and 10am to 4pm on the Sunday. In addition to Fisherton Sarum there are 14 other layouts across a wide range of scales attending including a number that are Southern related.

 

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One of the regular operational movements when operating Fisherton Sarum is to bring the 12t box van of spare parts and shed consumables, that has arrived from Eastliegh works, to the shed stores located in the water tower building at its own unloading platform.

Uncoupling_1

With the electromagnet energised the iron wire dropper visible under the coupling hook is pulled down and the hook lifts

Just as at Salisbury this involves a shunt across the turntable. At an exhibition this has required a 12″ to the foot scale ‘hand of god’ to uncouple the wagon from the shed pilot loco, or sometimes the ash wagon, until now…

With the simple addition of a short piece of iron wire fixed to the dropper of the tension lock coupling hook, and the installation of a ‘Dingham’ electromagnet kindly provided by fellow High Wycombe and District MRS member and regular Fisherton Sarum operator Mark Riddoch the process is now totally hands free!

Another view with the electromagnet energised and the hook lifted clear of the bar

Another view with the electromagnet energised and the hook lifted clear of the bar

The bolt of the Dingham electromagnet has been simply self threaded into an interference hole drilled into the baseboard below so that the end of the bolt does not quite come though the ballast keeping it totally invisible from view, whilst firmly holding the coil in place under the board. A simple push to make switch on the control panel provides the required 12v DC for the magnet to operate that pulls down the iron wire dropper that lifts the hook for uncoupling.

This latest addition to Fisherton Sarum can be viewed in action during its next exhibition appearance at the Hornby Magazine Live Exhibition at the Hartlepool College of Further Education on the 13th / 14th July 2013.

The brief video below also shows the uncoupling in action.

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