Four-wheeled hand truck capable of achieving pivot steering

Abstract

The invention relates to a four-wheeled hand truck, in particular to a four-wheeled hand truck capable of achieving pivot steering. The four-wheeled hand truck comprises a frame, handles connected with the frame, a left roller, a right roller, a front roller and a rear roller, the left roller and the right roller are fixed and arranged at middle positions of two sides of the frame, the front roller and the rear roller are arranged at middle positions of the front end and the rear end of the frame and capable of steering, and a rotating link gear capable of rotating synchronously in opposite directions is arranged between a front roller support and a rear roller support. When the four-wheeled hand truck is pushed forward linearly, rolling shafts of the front roller and the rear roller and rolling shafts of the left roller and the right roller are adjusted to be parallel, and the four-wheeled hand truck can easily keep moving forward linearly; and when the rolling shaft of the front roller is adjusted to be perpendicular to the rolling shaft of the rear roller, the rolling shafts of the front roller and the rear roller are perpendicular to the rolling shafts of the left roller and the right roller, and the four-wheeled hand truck can achieve pivot steering.

Description

technical field [0001] The invention relates to a four-wheel trolley, in particular to a four-wheel trolley which can be steered in situ. Background technique [0002] Trolley is a means of transportation that can often be seen in warehouses, freight yards or logistics centers for short-distance cargo delivery. The trolley is economical and easy to use. There are two kinds of trolleys: three-wheel and four-wheel. The four-wheel trolley is more stable and has a higher load capacity. The existing common four-wheel barrow structure usually includes a vehicle frame, a handle connected with the vehicle frame, and wheels arranged below the vehicle frame. The wheels generally include a pair of front wheels and a pair of rear wheels, and the front wheels and the rear wheels are arranged side by side. , in order to facilitate the steering of the four-wheeled trolley, at least one set of the front wheel and the rear wheel is a universal wheel. For the four-wheeled trolley with both t...

AI Technical Summary

Problems solved by technology

The existing common four-wheel barrow structure usually includes a vehicle frame, a handle connected with the vehicle frame, and wheels arranged below the vehicle frame. The wheels generally include a pair of front wheels and a pair of rear wheels, and the front wheels and the rear wheels are arranged side by side. , in order to facilitate the steering of the four-wheeled trolley, at least one set of the front wheel and the rear wheel is a universal wheel. For the four-wheeled trolley with both the front wheel and the rear wheel, although the steering is flexible, it can realize 360 ​​degrees in situ. However, when pushing forward in a straight line, the direction is not easy to control, especially when heavy goods are loaded; and for a four-wheeled trolley with only one set of universal wheels in the front and rear wheels, although relatively speaking in a straight line It is easier to control the direction when pushing forward, but it is impossible to make a 360-degree turn on the spot. If you need to turn, you need a larger space. Declining utilization rates, increasing warehousing costs

There is also a four-wheel trolley, with fixed side rollers in the middle of the left and right sides of the frame, fixed front rollers and fixed rear rollers in the middle of the front and rear sides, and the wheel diameters of the fixed front rollers and fixed rear rollers are smaller than those of the fixed side. The wheel diameter of the rollers. When the four-wheeled trolley is moving forward or backward, it uses two fixed side rollers, one of the fixed front rollers and the fixed rear rollers to land on the ground. Both the fixed front rollers and the fixed rear rollers are lifted off the ground, and only the two fixed side rollers are left on the ground to turn the cart. When the cart is loaded with heavy objects, the steering will be very laborious, labor-intensive, and not stable. security incident

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