Patent ID: 9079595
Filing Date: 2015-07-14
Classification: B25H,B62B

Abstract:
1. A cart comprising: a support body; a plurality of drawers slidably disposed in the support body; four wheel assemblies disposed on four bottom corners of the support body respectively, each of the wheel assemblies includes a hollow cylinder, a biasing member disposed in the hollow cylinder, a roller biased downward by the biasing member and having a partially threaded shank inserted through the biasing member and the hollow cylinder into the support body for fastening, and a threaded fastener secured to the partially threaded shank; four lock sleeves each secured onto the hollow cylinder; wherein in a ready to wheel or wheeling state, the partially threaded shank of each of the wheel assemblies is rested on a top of the hollow cylinder, and both the cylinder and the lock sleeve are above a bottom end of the roller of each of the wheel assemblies; and wherein in response to a force exerted on the top of the support body greater than a predetermined value, both the hollow cylinders and the lock sleeves are pushed down with the biasing members being further compressed until bottoms of both the hollow cylinders and the lock sleeves are flush with a bottom of the roller of each of the wheel assemblies.