Pneumatic height-adjustable safety helmet for building construction

Abstract

The invention belongs to the technical field of safety helmets, and in particular relates to a pneumatic height-adjustable safety helmet for building construction. The safety helmet comprises rollingbeads, a first helmet shell, triggering mechanisms, driving mechanisms, a mounting ring, a moving hole, first springs, a sliding cavity, a second helmet shell, a third helmet shell, spherical holes, first round holes, T-shaped grooves and the like; according to the safety helmet provided by the invention, four heat emission holes are uniformly formed in the circumferential direction of the arc-shaped inner wall of the third helmet shell, so as to conveniently promote heat dissipation of the head of working personnel wearing the safety helmet; four T-shaped blocks are uniformly arranged on theouter circumferential surface of the third helmet shell in a circumferential direction and the T-shaped blocks are matched with corresponding T-shaped grooves in the mounting ring, so that purposes ofguiding and limiting motions of the mounting ring can be achieved; the safety helmet provided by the invention, when not used, is small in volume, so that the safety helmet, in comparison with conventional safety helmets, can save space; and the safety helmet, when used, can increase the height so that the safety helmet can serve as the conventional safety helmets.

Description

Technical field [0001] The invention belongs to the technical field of safety helmets, and in particular relates to a pneumatic height-adjustable safety helmet for building construction. Background technique [0002] 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 blocks, so it is necessary to design a compressed air height-adjustable building construction hard hat. [0003] The present invention design...

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Problems solved by technology

[0002] 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 blocks, so it is necessary to design a compressed air height-adjustable building construction hard hat

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