Vertical movable log skidder with hold down means

Claim 1

A SKIDDER FOR PULP WOOD LOGS AND THE LIKE ADAPTED TO BE MOUNTED ON A SELF PROPELLED SOURCE OF POWER AND TO BE OPERATED THEREBY; COMPRISING IN COMBINATION A SUBSTANTIALLY VERTICALLY SITUATED HEAD FRAME ATTACHED TO SAID SOURCE OF POWER, A BASE FORK MEMBER MOUNTED ON EACH SIDE OF SAID HEAD FRAME FOR INDEPENDENT RECIPROCAL MOTION RELATIVE TO ONE ANOTHER, UP AND DOWN SAID HEAD FRAME WITHIN LIMITS, SAID BASE FORK MEMBERS INCLUDING A VERTICAL PORTION MOUNTING SAID MEMBER TO SAID HEAD FRAME AND A FORWARDLY EXTENDING BASE PORTION FORMED INTEGRALLY WITH SAID VERTICAL PORTION OF THE LOWER END THEREOF, A FORWARDLY EXTENDING SPUR FORMED ON THE UPPER END OF EACH OF SAID VERTICAL PORTIONS, HYDRAULIC PISTON AND CYLINDER MEANS OPERATIVELY CONNECTED TO SAID BASE FORK MEMBERS FOR RECIPROCAL MOTION, AN UPPER FORK ASSEMBLY MOUNTED ON SAID HEAD FRAME TO COOPERATE WITH SAID BASE FORK MEMBERS, SAID UPPER FORK ASSEMBLY INCLUDING AT LEAST ONE LOG ENGAGING FORK AND BEING MOUNTED FOR RECIPROCAL MOVEMENT UP AND DOWN SAID HEAD FRAME WITHIN LIMITS, HYDRAULIC PISTON AND CYLINDER MEANS OPERATIVELY CONNECTED TO SAID UPPER FORK ASSEMBLY FOR SAID RECIPROCAL MOTION, MEANS ON SAID UPPER FORK ASSEMBLY ADAPTED TO SWING SAID LOG ENGAGING FORK IN A VERTICAL PLANE IN AN ARC WITHIN LIMITS, AND HYDRAULIC PISTON AND CYLINDER MEANS OPERATIVELY CONNECTED TO SAID LAST MENTIONED MEANS FOR SWINGING SAID LOG ENGAGING FORK AS AFORESAID.