Abstract: This invention relates to a bow and spring hinge assembly for eyeglasses, in which each bow can be opened beyond a stop-defined position so that the bow can resiliently bear on the head of the wearer. The novel assembly can be used also with slender and thin bows and provides for a transverse bracing for eliminating a transverse backlash between relatively slidable parts. For this reason the assembly is provided in the slider and in the bow end portion with recesses, which face each other and each of which is provided on opposite sides with inwardly facing track grooves, and I-section members are provided, each of which is in sliding contact with the track grooves of both said recesses so that said I-section members hold said bow end portion and said slider together against a transverse separation.

Abstract: This invention relates to a spring-biased hinge assembly for spectacles. The hinge assembly comprises a bow-side section defining a cavity, and a slider, which carries a bow-side hinge element and extends into the cavity and is adapted to be extended from said cavity against spring action. The bow-side hinge element cooperates with the midportion-side hinge element. The hinge assembly should be slender and should be accommodated to a large extent in the end portion of the bow. For this purpose, the cavity is defined by a flat tubular element, in which a tongue of the slider is slidably mounted. The tongue has a longitudinal slot, in which the return spring extends, which engages an abutment that extends into the wall of the tubular member and through said slot.

Abstract: This invention relates to a spectacle frame having metal or plastic bows, which can be forced open beyond their normal open position to bear resiliently on the head of the wearer. Each bow is connected to the rim of the spectacle frame by a hinge, which includes a bow-side part and a rim-side part. The hinge includes a spring mechanism, which at least in a plastic bow can be almost entirely or entirely accommodated. The hinge should be adapted to be used with metal bows in such a manner that only flat portions of the hinge protrude on the inside of the bow so that the bow will be flat and free from protruding hinge portions on the inside, which faces the face of the wearer.

Abstract: This invention relates to a spring hinge for eyeglasses having plastic or metal bows. The hinge includes a first hinge member which is adapted to be connected to a bow, and a second hinge member which is adapted to be connected to a frame center part, both hinge members being pivotally interconnected. The first hinge member is connected to an elongated U-shaped slider which extends into and is guided in a flat receptacle provided at the end of the bow. A spring member fitted on a rod is received in the slider for urging the same into the receptacle. The first hinge member has a portion overlapping the receptacle adjacent to the open end thereof. Between the slider and the overlapping portion, the first hinge member is further provided with a bevelled surface for engaging the outlet edge of the receptacle when the hinge is retracted so that there is no backlash during the movement of the bow from the inturned position to the normal open position.