Abstract: A compound protective helmet, allowing firm and stable restriction when a restriction hook provided in the restriction lever is hooked into the restriction trough of the bubble, which is comprised of a bubble, a chin protector, and a visor which is pivoted in the bubble to allow two-stage lift; within, a restriction device is fixed to the chin protector, the restriction device is comprised of a fixing base, a leading block provided in the fixing base, a restriction lever, and positioning pieces fixed inside the chin protector; the fixing base and two slope positioning blocks form an integral part to increase strength and prevent the positioning blocks from breaking; a positioning arc is provided at the outside of the restriction lever, the top and the bottom of the positioning arc is riveted to the positioning base and tightened to the positioning piece respectively, so as to prevent the restriction lever from disengaging from the fixing base and to secure the restriction lever firmly at the inside of the chi

Abstract: A compound protective helmet that allows easy and reliable operation of the visor. The helmet includes a bubble, a visor pivoted to the bubble, and a chin protector. A pad is provided between the bubble and the visor to allow two-stage lifting of the visor. A securing and release device is fixed in the chin protector, and includes two securing levers that are driven by a leading block and are held against a resilient element so as to be secured in grooves provided in the ear protector on both sides of the bubble. If a user wants to raise the visor, the pusher block is pushed to cause the securing levers to disengage from the grooves while lifting the visor.

Abstract: A heat sink structure of a safety helmet includes an inner helmet provided inside the helmet shell; a lining provided inside said inner helmet with the top of said lining indicating an opening; and a resilient provided between said inner helmet and said lining, with an air circulation space formed between the resilient mesh and the inner helmet; said resilient mesh holds against the top of the rider's head and contacts the rider's forehead allowing the cooler, ambient air(wind) enter into said air circulation space through the gap between the rider's forehead and the mesh to form a free circulation of air, resulting in good air ventilation and heat dissipation, so that the rider feels easy and comfortable wearing the safety helmet.