초록 ▼

A cart includes four wheel assemblies disposed on four bottom corners of a support body respectively, each wheel assembly including a hollow cylinder, a biasing member in the hollow cylinder, a roller having a partially threaded shank inserted through the biasing member and the hollow cylinder into

A cart includes four wheel assemblies disposed on four bottom corners of a support body respectively, each wheel assembly including a hollow cylinder, a biasing member in the hollow cylinder, a roller 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. In a ready to wheel or wheeling state, the partially threaded shank 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. In response to a user sitting on the support body, both the hollow cylinders and the lock sleeves are pushed down with the biasing members being further compressed until both the hollow cylinders and the lock sleeves contact a supporting ground.

대표청구항 ▼

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 rolle

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; andwherein 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. 2. The cart of claim 1, further comprising a handle assembly and a drawer lock assembly. 3. The cart of claim 2, wherein the handle assembly is disposed on a rear surface of the support body and includes a handle grip, a first sliding tube extending downward from the handle grip, a second sliding tube adapted to fully receive the first sliding tube from above, a third sliding tube adapted to fully receive the second sliding tube from above, a first support tube disposed on the top of the support body, and a second support tube extending downward from the first support tube to be disposed a position proximate to a bottom of the support body wherein the third sliding tube is adapted to fully dispose in both the first and second support tubes. 4. The cart of claim 3, further comprising a plurality of two opposite slide assemblies disposed on inner surface of both sides of the support body for slidably moving the drawers into or out of the support body; wherein the drawer lock assembly includes a mounting plate fastened on the rear surface of the support body, a plurality of inverted L shaped lock members formed on the mounting plate, a holed plate secured to a bottom of the lowest one of the lock members, a lever member disposed on a bottom of the support body and having a pivotal bar having one end disposed through the holed plate and the other end inserted through an aperture on a lower portion of the second support tube into an activation member on a bottom of the third sliding tube, an anchorage member secured to the rear surface of the support body, and a biasing element having one end secured to the anchorage member and the other end secured to a portion of the bar proximate the aperture; wherein a pulling up of the handle grip telescopically slides the first, second, and third sliding tubes out of the first and second support tubes, causes the activation member to disengage from the other end of the bar and lifts one end of the bar, and causes the biasing member to pull the bar to stop urging the holed plate so that the lock members move downward to its original positions to lock the drawers; and wherein a pushing down of the handle grip telescopically push the first, second, and third sliding tubes into the first and second support tubes, causes the activation member to push down the other end of the bar, and lifts one end of the bar so that the holed plate is urged to move the lock members to unlock the drawers.