GALLOWAY’S NON DEAD CENTRE ENGINE
Brian Stephenson


Anthony Mount

Pictured at a Harrogate exhibition this Galloway’s non dead centre engine is to an Anthony Mount design. This engine was patented in 1838 by Elijah Galloway and was an attempt to build an engine with the advantages of self starting in any position with the simplicity of a single crank.

As can be seen there are two vertical cylinders connected by a connecting rod of triangular configuration to a single crank placed between the cylinders. As the pistons are 90 degrees out of phase to each other there is never a position where the piston of at least one cylinder cannot bear upon the crank.

During each revolution the top beam of the connecting rod goes from horizontal to an angle as the piston rods are in a fixed plane some means of extending the beam is required. This is accomplished by having sliding bearings in the crossheads.

To keep the centre of the connecting rod beam in a straight vertical line, a motion beam is connected to the centre of the connecting rod beam and goes via mother sliding bearing housed in brackets to the side of one cylinder to another tie rod which goes back to the brackets. This sort of ‘parallel motion’ constrains the connecting rod into a straight vertical line.

The engine was designed for marine use driving paddles and for land use as a stationary engine.

https://www.sarikhobbies.com/model-engineer-builder/
https://www.sarikhobbies.com/model-engineer-builder/

Modelengineeringwebsite.com

the only free and the only weekly magazine for model engineers. 

Editor: David Carpenter