A safety tool for opening manhole covers

Abstract

A safety tool for opening a well lid comprises a base. An inclined telescopic support and a well lid fixing mechanism are arranged on the side of the base, and a well lid lifting mechanism is arranged on the side face of the telescopic support. The telescopic support comprises an upper support of a hollow structure and a lower support of a hollow structure. The upper portion of the lower support stretches into the upper support. A strip-shaped opening is formed in the side face of the upper support, and a vertical plate is arranged on the side face of the upper end of the lower support and arranged outside the strip-shaped opening. The well lid lifting mechanism comprises a first chain wheel and a second chain wheel. A chain is arranged on the first chain wheel and the second chain wheel and fixedly connected with the vertical plate. A rotary handle is arranged at the outer end of a first rotary shaft. A ratchet mechanism is arranged at the top of the upper support and comprises a ratchet fixed to the first rotary shaft, and a pawl matching the ratchet is arranged on the side face of the ratchet. The well lid fixing mechanism comprises a vertical rod. A cross rod is arranged at the lower end of the vertical rod, and a bearing is arranged at the upper end of the vertical rod and on the lower support. In the opening process of the well lid and after the well lid is opened, the well lid can be fixed conveniently, and the well lid is prevented from accidentally falling off.

Description

technical field [0001] The invention relates to a well cover opening device, which belongs to the field of auxiliary tools, in particular to a safety tool for opening a well cover. Background technique [0002] With the development and needs of urban construction, commonly used pipes or cables for tap water, telecommunications, electricity, gas, heat, fire protection, etc. are laid underground, and well shafts and well chambers for maintenance and repair are arranged at intervals along the line. Install the openable manhole cover at the level of the road, and enter the well chamber through the manhole cover to maintain the relevant facilities in daily use. [0003] At present, the common way to open the manhole cover requires the use of two tools, a pick and a crowbar. First, insert the pick into the opening hole of the manhole cover. The manhole cover is open. The tools mentioned above cannot be operated by a single person when opening the manhole cover, which is time-con...

AI Technical Summary

Problems solved by technology

But the defect that it exists is that when the hook lifts the manhole cover, it cannot effectively fix the manhole cover, and it is easy to cause the manhole cover to fall off from the hook; in addition, when the manhole cover is opened and in the process of opening, the opening height and the state after opening cannot be fixed.

In the above two situations, it is easy to cause the accident that the manhole cover falls and hurts people when it is opened or after it is opened, and the safety is poor, resulting in the loss of personnel and property.

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