Patent ID: 6854546
Filing Date: 2005-02-15
Classification: B62D,E02F

Abstract:
1. A power machine having a frame and a cab rotatably coupled to the frame about a pivot axis and movable from a closed position in which a cab's weight acts to provide substantial moments resisting opening movement, to an open position in which the cab center of gravity goes over the pivot axis so the cab continues to tend to rotate from its own weight until stopped, a first spring extendable from a first length to a second longer length coupled between the cab and the frame to provide a force tending to move the cab from the closed position toward the open position, and providing force throughout the pivoting of the cab to a position where the center of gravity is adjacent a vertical plane passing through the pivot axis and an auxiliary spring extendable from a first length to a second longer length coupled between the cab and the frame through a linkage, the auxiliary spring providing an auxiliary force tending to urge the cab to rotate to the open position from the closed position for only a selected portion of the cab rotational movement, wherein the linkage comprises a lost motion linkage having a slot, a pin connecting the auxiliary spring to the linkage through the slot, and the pin sliding in the slot during the portion of pivoting of the cab between the end of the selected portion of the cab rotational movement until the cab reaches the open position.