초록 ▼

A vehicle such as a wheelchair having wheels by which the vehicle is propelled and steered and castors which support a proportion of the vehicle's weight, has its castors provided with biasing means which resists swivelling movement of the castors from the straight-ahead position thereby resisting a

A vehicle such as a wheelchair having wheels by which the vehicle is propelled and steered and castors which support a proportion of the vehicle's weight, has its castors provided with biasing means which resists swivelling movement of the castors from the straight-ahead position thereby resisting an oversteer condition of the vehicle.

대표청구항 ▼

[ We claim:] [1.] A vehicle comprising a front part, a rear part, a left hand side part, and a right hand side part; a pair of wheels spaced laterally of the front part; means for driving said wheels whereby the vehicle is propelled and steered; a first castor wheel assembly mounted at the rear part

[ We claim:] [1.] A vehicle comprising a front part, a rear part, a left hand side part, and a right hand side part; a pair of wheels spaced laterally of the front part; means for driving said wheels whereby the vehicle is propelled and steered; a first castor wheel assembly mounted at the rear part along the right hand side part, a second castor wheel assembly mounted at the rear part along the left hand side part, each said castor wheel assembly comprising a ground-engaging wheel and means supporting said ground-engaging wheel for rotation about a substantially horizontal rotational axis and for swivelling movement about a substantially vertical swivelling axis, a biasing means for providing a resistance to swivelling of the ground-engaging wheel of the castor wheel assemblies from a straight-ahead position whereby said first castor wheel assembly has its biasing means arranged to cause a different resistance from said biasing means of said second castor wheel assembly and whereby said second castor wheel assembly has its biasing means arranged to cause a different resistance from said biasing means of said first castor wheel assembly in respect of like swivelling movements of the castor wheel assemblies, said biasing means comprising a cam and follower mounted for relative axial displacement in response to swivelling movement, and means for resisting said relative axial displacement of said cam and follower thereby resisting swivelling movement of the castor wheel assemblies.