A snap fit eyeglasses frame includes a left eyeglass frame portion and a right eyeglass frame portion which can be separated. There is a male connector portion of the left side eyeglasses frame portion, and there is a female connector portion of the right side eyeglasses frame portion 20, whereby the male and female connector portions are assembled together when securing the left and right frame portions together. There is an aperture in the female connector portion to receive a locking member, which also will serve as the release member. The male connector portion has the release member which is deformed or bent out of the way during assembly, and which after assembly is urged toward a position where it extends through the aperture in the female connector portion The release member provided on the male connector portion.

A method for purifying powdered silicon carbide is in the form of a starting material to form a silicon carbide having a purity of at least 99.9%. This method has the following method steps: providing a starting material having a grain size of less than 100 μm and a silicon carbide content with at least 98% purity; and heating the starting material in a vacuum or oxygen-free atmosphere to a temperature above 1700° C. over a period of at least 8 minutes.

Disclosed is a method for manufacturing a three-dimensional article, including: a step of producing the article by an additive manufacturing technology, the article including at least two parts that face, at least partially, each other or that have edges facing, at least partially, each other; and a step of finishing of the article. According to the invention, the two parts are produced together with a temporary connection that links the two parts, and the method includes, after the step of finishing, a step of unlinking the temporary connection in order to separate the two parts.

A pair of glasses includes an upper spectacle frame, a lower spectacle frame, two temples, and two snap-fit components. The lower spectacle frame has two lateral ends detachably integrated with two lateral ends of the upper spectacle frame. At least one lens is installed between the upper and lower spectacle frames. Each temple is pivotally fitted to one of the lateral ends of the upper spectacle frame. Each snap-fit component includes a first end at which a snap-fit portion is designed and a second end coupled with a corresponding temple. The snap-fit portion of each snap-fit component, which is in a fixed position, is inserted into a fastening hole in the at least one lens to fix the lens. The snap-fit portion of each snap-fit component, which is in a separate position, is separated from the fastening hole for replacement of the lens.

A pair of glasses includes an upper spectacle frame, a lower spectacle frame, two temples, and two snap-fit components. The lower spectacle frame has two lateral ends detachably integrated with two lateral ends of the upper spectacle frame. At least one lens is installed between the upper and lower spectacle frames. Each temple is pivotally fitted to one of the lateral ends of the upper spectacle frame. Each snap-fit component includes a first end at which a snap-fit portion is designed and a second end coupled with a corresponding temple. The snap-fit portion of each snap-fit component, which is in a fixed position, is inserted into a fastening hole in the at least one lens to fix the lens. The snap-fit portion of each snap-fit component, which is in a separate position, is separated from the fastening hole for replacement of the lens.

A lens exchanging structure of spectacles is disclosed. The lens exchanging structure of spectacles includes a trench disposed on a lens rim for receiving a lens. An open slot is disposed in the trench and has a long through hole having a first holey section and a second holey section. A moving part is placed in the open slot and has a bump disposed in the first holey section. A positioning part is disposed in the second holey section and assembled with the moving part. Therefore, the lens can be positioned or removed by the moving mechanism of the moving part in the open slot.

A lens exchanging structure of spectacles is disclosed. The lens exchanging structure of spectacles includes a trench disposed on a lens rim for receiving a lens. An open slot is disposed in the trench and has a long through hole having a first holey section and a second holey section. A moving part is placed in the open slot and has a bump disposed in the first holey section. A positioning part is disposed in the second holey section and assembled with the moving part. Therefore, the lens can be positioned or removed by the moving mechanism of the moving part in the open slot.

Eyewear for releasably receiving a lens has a joint sleeve for holding the lens in place.

Eyewear for releasably receiving a lens has a joint sleeve for holding the lens in place.

Eyeglasses with a changeable frame are revealed. The eyeglasses include an upper frame and a lower frame. The upper frame and the lower frame have a lens assembly portion and a lens assembly part, respectively. The upper frame and the lower frame are disposed with locking slots and projections respectively. The projections are corresponding to and joined with the locking slots. The upper frame and the lower frame are connected into one part by locking protrusions of the projection into the concaves of the locking slots correspondingly. Thus users can assemble or disassemble the upper frame with the lower frame for changing the eyeglasses into half-frame eyeglasses or full-frame eyeglasses.