초록 ▼

A suspension device for preventing swivel wheel wobbling over uneven terrain of a cart, such as a shopping cart, equipped with a pair of laterally opposite swivel wheels. The suspension device consists of a rigid elongated cross-member, fixedly mounted to the cart frame; an elongated arm, defining f

A suspension device for preventing swivel wheel wobbling over uneven terrain of a cart, such as a shopping cart, equipped with a pair of laterally opposite swivel wheels. The suspension device consists of a rigid elongated cross-member, fixedly mounted to the cart frame; an elongated arm, defining first and second opposite ends; a first mount, for mounting the arm to the cross-member for relative movement thereabout, whereby the arm first and second ends are movable relative to the ground in opposite directions. Stoppers restrain relative movement of the arm first and second ends within a prescribed play. A second mount rotatably mounts the two swivel wheels to corresponding opposite ends of the elongated arm, wherein the relative movement of the arm is responsive to ground terrain irregularities.

대표청구항 ▼

[ We claim:] [1.] A swivel wheel anti-wobbling device for preventing swivel wheel wobbling of a cart over uneven terrain, the cart of the type including a rigid underframe to be directionally carried over ground by a pair of laterally opposite swivel wheels, for supporting one end of the cart and a

[ We claim:] [1.] A swivel wheel anti-wobbling device for preventing swivel wheel wobbling of a cart over uneven terrain, the cart of the type including a rigid underframe to be directionally carried over ground by a pair of laterally opposite swivel wheels, for supporting one end of the cart and a pair of fixed wheel assemblies rigidly connected to the underframe at an opposite end of the cart said device comprising:a rigid elongated cross-member, to be fixedly mounted to the cart under frame;a rigid elongated arm member defining first and second opposite ends;first mounting means for mounting said arm member intermediate said first and second ends thereof underneath and in alignment with said cross-member such that said arm member can rotate in a pivoting movement about a horizontal axis at said first mounting means;springless limit means provided on said arm member and on said elongated cross-member and adapted to allow said arm member to freely rotate within a prescribed play and to interrupt said pivoting movement at limits of said prescribed play, whereby lateral stability of the cart is not compromised; andsecond mounting means for rotatably mounting the two swivel wheels to corresponding said opposite first and second ends of said elongated arm member; wherein said pivoting movement of said arm member is responsive to terrain irregularities while being limited by said limit means so as to limit vertical displacements of the swivel wheels and prevent the cart from becoming unstable.