A gear-driven height-adjustable safety helmet for construction use

Abstract

The invention belongs to the technical field of safety helmets, and particularly relates to a gear transmission height adjustable safety helmet for building construction. The gear transmission height adjustable safety helmet comprises rolling beads, a first cap shell, a drive mechanism, a mounting ring, a moving hole, a first spring, a sliding cavity, a second cap shell, a third cap shell, spherical holes and the like. According to the gear transmission height adjustable safety helmet for building construction, four heat dissipation holes circumferentially and evenly formed in the arc-shaped inner wall of the third cap shell are used for heat dissipation of heads of workers wearing the safety helmet; and four second T-shaped blocks circumferentially mounted on the external round surface of the third cap shell are used for being matched with corresponding second T-shaped grooves formed in the mounting ring to achieve the purpose of guiding and limiting motion of the mounting ring. When the safety helmet is not in use, at this moment, the space size of the safety helmet is small, thus the safety helmet saves the space relative to a traditional safety helmet, during using, the height of the safety helmet can be increased, the safety helmet can be used as the traditional safety helmet, the structure is simple and reliable, and meanwhile the gear transmission height adjustable safety helmet for building construction has the great effect.

Description

[0001] Technical field [0002] The invention belongs to the technical field of safety helmets, and in particular relates to a gear transmission type height-adjustable safety helmet used in construction. Background technique [0003] At present, the shell of the existing safety helmet is elliptical or hemispherical, with a smooth surface. When an object falls on the shell, the object cannot stop and slide down immediately; The reduced force of the liner can reach more than 2 / 3, and the rest of the force is transmitted to the human skull through the entire area of ​​the cap liner, so that the focus point becomes the force surface, thereby avoiding the impact force on a certain point on the cap shell. Concentration reduces the force per unit area, but such a structure takes up a lot of space, and at the same time it cannot withstand the impact of large heavy blocks well, so it is necessary to design a gear-driven height-adjustable building construction Hard hats used. [0004]...

AI Technical Summary

Problems solved by technology

[0003] At present, the shell of the existing safety helmet is elliptical or hemispherical, with a smooth surface. When an object falls on the shell, the object cannot stop and slide down immediately; The reduced force of the liner can reach more than 2 / 3, and the rest of the force is transmitted to the human skull through the entire area of ​​the cap liner, so that the focus point becomes the force surface, thereby avoiding the impact force on a certain point on the cap shell. Concentration reduces the force per unit area, but such a structure takes up a lot of space, and at the same time it cannot withstand the impact of large heavy blocks well, so it is necessary to design a gear-driven height-adjustable building construction helmet used

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