Abstract: Disclosed are an anti-off device and a protective hat having the anti-off device. The protective hat includes a hat body, protective goggles, a binding strap and an anti-off device. The hat body has a slot; the protective goggles and the binding strap are bundled altogether with the hat body; the anti-off device includes an anti-off body and snap arm. The anti-off body has a passage; a snap arm integrally coupled to the anti-off body, and the snap arm is inserted into the slot and the snap body is detachably engaged with the hat body, and the binding strap is disposed in the passage, such that when the protective goggles are moved upward or downward, the binding strap is still limited by passage to achieve the anti-off effect.

Abstract: A screwless eyeglass structure includes a frame and two legs. Each of two ends of the frame includes a fastening unit. The fastening unit includes two support arms, an assembly pillar connected to the two support arms, and an assembly hole adjacent to the assembly pillar. One end of each leg has a connection unit assembled with the fastening unit. The connection unit includes a body, a connection plate extending from the body, a guiding plate connected to one end of the connection plate, and a slot disposed in the connection plate. The guiding plate is inserted through the assembly hole to be engaged with the assembly pillar, the connection plate is rotatable with respect to the frame, and the assembly pillar is pivotally connected to the slot. Accordingly, the leg can be assembled to the frame quickly, and an assembly process is simple and time-efficient.

Abstract: An arm (1) of spectacles (8) having a frame member (81) includes an arm rod (10) and an adjustable hanging assembly (20). The adjustable hanging assembly (20) comprises a hanging part (21) connected to the arm rod (10) and a positioning member (22) disposed between the arm rod (10) and the hanging part (21). Thus, the comfort of a user wearing spectacles can be improved.