B - Operations – Transporting – 60 – B
Patent
B - Operations, Transporting
60
B
16/10
B60B 33/00 (2006.01) B60B 33/04 (2006.01)
Patent
CA 1199154
ABSTRACT On a cart which is guided by a person not riding on it, it is common for the cart to be on two pairs of wheels, one pair of them on a fixed axle, and each wheel of the other pair on a short axle which swivels about a pivot, the axis of which is vertical and not on a line which intersects the axis of the wheel axle, and the bearing of which is fixed to the cart body. For carts which have to be guided with precision in both forward and reverse directions, such as lawnmowers, the usual swivel wheel is unsuitable because when the cart changes direction between forward and reverse the swivel wheels swivel through half a revolution, which causes difficulties when the lawnmower is alongside an obstacle such as a fence. It is necessary, in in any kind of swivel wheel for the vertical pivot to lead the wheel axle as the cart is moving, which means that the relative positions of the axle and pivot must be reversed as the cart changes between forward and reverse. In this invention the vertical pivot is allowed to slide along a guideway which depends from the wheel axle, in order to acheive the above mentioned reversal of positions. In the invention there is also a spring clutch arrangement which prevents the swivel wheel from rotating on its axle while the pivot is changing positions. Furthermore, each of the pair of swivel wheels may be linked to the other so that both always swivel by the same amount.
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