Device for connecting lens and earmuff to safety helmet

A device for connecting a lens and an earmuff to a safety helmet, comprising:

• a retaining frame including a pivot portion coupled integrally to either side of the retaining frame, said pivot portion being configured with an engaging block positioned on an inner side of the pivot portion in an integral connection therewith, and a first pressing block on a periphery of the pivot portion;
• two pivot members, each pivot member of said two pivot members being pivotally connected to a respective pivot portion of the retaining frame, said each pivot member having an engaging slot corresponding in position and in shape to the engaging block, the engaging slot having a width greater than that of the engaging block for the engaging block to pass through the engaging slot, the each pivot member being rotatably connected to the respective pivot portion, a slide portion being provided on a periphery of the each pivot member and corresponding in position to the first pressing block, the slide portion having at least one first groove, wherein, when the respective pivot portion is turned relative to the pivot member, the first pressing block is forced to be positioned in the at least one first groove, so that the retaining frame is turned to an angle relative to the pivot member, the each pivot member further including a positioning strip connected integrally, at one end thereof, to said slide portion of said each pivot member, said positioning strip extending backward from said each pivot member and having a plurality of second grooves arranged continuously on an outer side of the positioning strip;
• two connecting units, each connecting unit of said two connecting units being coupled to a respective pivot member of the two pivot members, the each connecting unit having a second slide groove on an inner side thereof, the positioning strip being inserted and slidable in the second slide groove, a second pressing block being disposed on an inner wall of the second slide groove, wherein the second pressing block is pressed into a respective one of the second grooves in a multi-step manner, thus permitting the each pivot member to slide and extend to a length relative to the each connecting unit, the connecting unit further including an elastic insert.