The wheelchair and buggy were linked together with a ‘push bar’ having universal joints at each end and removable from sitting position in wheelchair. The buggy end pin is on an arm, hinged on main bar at chair end and at a slight angle to it. A slide, between the arm and bar, with fixed centres, when pushed forward engages and locks the pin. Pulling the slider back removes the pin. Major section of bar removed by unscrewing wingnut at wheelchair end.
There is now less chance of mishap when the client takes her child out with her.