Jack

Abstract

The invention discloses a jack which comprises an inner barrel and an outer barrel. An end of the inner barre, close to the ground, is provided with a conical head. A second retaining plate is arranged at a plane end of the conical head and provided with second through holes, and at least four third retaining plates perpendicular to the second retaining plate are arranged. The second through holes are used for preventing the problem that the second retaining plate is not easy to pull up due to vacuum of a contact surface between the second retaining plate and sludge. The third retaining plates form side fixing parts so as to prevent side deflection of the jack. Ends of the third retaining plates, contacting with the sludge, are conical and easier to enter the sludge by reducing the contact area. The length of the third retaining plates is smaller than that of the conical head, the conical head is more suitable for quickly entering the sludge than the third retaining plates and firstly contacts the sludge so that the jack can be inserted into the sludge. The second through holes are uniformly distributed on the second retaining plate and can uniformize air flow below the second retaining plate so as to allow the jack to be pulled out of the sludge conveniently.

Description

Technical field [0001] The invention belongs to a jack. Background technique [0002] A jack is a small and light lifting device that uses a steel lifting piece as a working device to lift heavy objects within the stroke through the top bracket or the bottom bracket. According to the structural characteristics, it can be divided into three types: rack jack, screw jack and hydraulic jack. Jack is the simplest lifting equipment with small lifting height (less than 1m). It has two types: mechanical and hydraulic. There are two types of mechanical jacks: rack type and screw type. Due to their small lifting weight and laborious operation, they are generally only used for mechanical maintenance work and are not applicable during bridge repair. The hydraulic jack has compact structure, stable operation and self-locking effect, so it is widely used. The disadvantage is that the lifting height is limited and the lifting speed is slow. The types of car jacks can be divided into four t...

AI Technical Summary

Problems solved by technology

When the car breaks down in the mud, or when it is necessary to lift heavy objects in the mud, the commonly used jack is placed directly in the mud, not only the weight of the jack will cause the jack to sink in the mud, but the bigger problem is When the jack is holding a heavy object, it cannot lift the heavy object, but the jack sinks deeper and deeper

At present, some jacks are equipped with a whole baffle near the conical head of the inner cylinder, but there is often more water in the muddy ground. Although the baffle can prevent the jack from sinking into the mud, it is difficult to pull it out after use, and it is difficult to pull it out in the muddy ground. It is easy to deflect the jack sideways

Images