Guidance apparatus for track following vehicles

Claim 1

Guidance apparatus for a track-following vehicle normally guided along a track by a guidance abutment at each side of the track, the track having a fork junction dividing it into a left hand track and a right hand track and there being at the fork junction discontinuities in the guidance abutments corresponding to the right hand guidance abutment of the left hand track and the left hand guidance abutment of the right hand track; comprising a left hand guide means and a right hand guide means supported for motion on the vehicle and each movable by selector means comprising a push pull cable in a housing control link connected to each of said guide means and connected to a control lever pivotally supported on the vehicle, movement of the control lever to the left being operative to move said left and right hand guide means clockwise about left and right hand fore and aft vehicle axes respectively into positions where said left hand guide means engage a left hand secondary guidance abutment leading into said left hand track and said right hand guide means are disengaged, and movement of the control lever to the right being operative to move said left and right hand guide means counter-clockwise about said fore and aft vehicle axes into positions where said right hand guide means engage a right hand secondary guidance abutment leading into said right hand track and said left hand guide means are disengaged, engagement of a guide means with a secondary guidance abutment acting as a stop to prevent return of that guide means to disengage position throughout passage of the fork junction.