Conveyors for conveying goods

Claim 1

A CONVEYOR OF THE KIND SPECIFIED CHARACTERIZED THAT IN ASSOCIATION WITH EACH DRIVING DOG IS A RETARDING DOG SPACED FORWARDLY OF THE DRIVING DOG IN THE DESIGNED DIRECTION OF ADVANCEMENT OF A CONVEYOR ELEMENT, EACH DRIVING DOG AND ITS ASSOCIATED RETARDING DOG BEING BOTH CARRIED UPON A COMMON SUPPORTING BODY MOUNTED FOR SLIDING MOVEMENT RELATIVE TO THE ASSOCIATED CONVEYOR ELEMENT IN A DIRECTION TRANSVERSE TO THE LENGTH THEREOF, SO AS TO PERMIT OF EACH DRIVING DOG TOGETHER WHITH ITS ASSOCIATED RETARDING DOG BEING DISPLACEABLE RELATIVE TO THE CONVEYOR ELEMENT FROM A TROLLEY ENGAGING TO A TROLLEY DISENGAGING POSITION, EACH DRIVING DOG BEING FORMED ON ITS REARWARDLY DIRECTED SIDE AND ON AT LEAST ONE OF ITS TWO LATERALLY DIRECTED SIDES RESPECTIVELY WITH A REAR TROLLEY ENGAGDING FACE AND A LATERAL TROLLEY ENGAGING FACE, EACH OF SAID TROLLEY ENGAGING FACES BEING INCLINED TO THE DIRECTION OF SLIDING MOVEMENT OF THE DRIVING DOG WITH EACH FACE DIRECTED AWAY FROM THE DIRECTION OF SLIDING MOVEMENT OF THE DRIVING DOG INTO THE TROLLEY DISENGAGING POSITION, EACH RETARDING DOG ON ITS FORWARDLY DIRECTED SIDE BEING FORMED WITH A FORWARDLY DIRECTED TROLLEY DRIVING ABUTMENT ENGAGING FACE WHICH IN A REARWARD DIRECTION IS INCLINED AWAY FROM THE DIRECTION OF SLIDING MOVEMENT OF THE RETARDING DOG INTO THE TROLLEY DISENGAGED POSITION, THE ARRANGEMENT BEING SUCH THAT IN THE EVENT OF A TROLLEY ADVANCING RELATIVELY TOWARDS THE DRIVING DOG SO AS TO BRING THE DRIVING ABUTMENT OF THE TROLLEY INTO ENGAGEMENT WITH THE REAR FACE OR THE LATERAL FACE OF SUCH DRIVING DOG THE LATTER IS SLIDDEN TEMPORARILY INTO ITS DISENGAGED POSITION TO PERMIT OF THE DRIVING ABUTMENT OF SAID TROLLEY MOVING FORWARDLY RELATIVE TO THE DRIVING DOG INTO A POSITION FOR ENENGAGMENT BY THE TROLLEY DRIVING FACE OF SUCH DOG.