Cross-spring-joint for side-pieces of spectacles

A cross-spring-joint for affixing a spectacles side piece to a spectacles frame, the cross-spring-joint including a fork spring having a first fork end, a second fork end, and a joint pin fitting through bore-holes in the first and second fork ends, the cross-spring-joint comprising:

• a first groove provided in at least one of said first and second fork ends, said first groove defining a first longitudinal axis generally through said first groove, said first reference axis being substantially perpendicular to a central axis of the joint pin;
• a second groove provided in at least one of said first and second fork ends, said second groove defining a second longitudinal axis generally through said second groove, said second longitudinal axis being substantially perpendicular to said first longitudinal axis and said central axis of the joint pin;
• the spectacles side piece being capable of location between the first and second fork ends in said first groove to define a first position of the spectacles side piece with respect to the cross-spring joint, or in said second groove to define a second position of the spectacles side piece with respect to the cross-spring-joint, wherein the spectacles side piece can be rotated around the joint pin between said first and second positions, the first and second fork ends exerting a force on the spectacles side piece to alternately hold the side piece in said first groove or said second groove.

A cross-spring-joint for affixing a spectacles side piece to a spectacles frame, the cross-spring-joint including a fork spring having a first fork end, a second fork end, and a joint pin fitting through bore-holes in the first and second fork ends, the cross-spring-joint comprising:

• a first groove provided in at least one of said first and second fork ends, said first groove defining a first longitudinal axis generally through said first groove, said first reference axis being substantially perpendicular to a central axis of the joint pin;
• a second groove provided in at least one of said first and second fork ends, said second groove defining a second longitudinal axis generally through said second groove, said second longitudinal axis being substantially perpendicular to said first longitudinal axis and said central axis of the joint pin;
• the spectacles side piece being capable of location between the first and second fork ends in said first groove to define a first position of the spectacles side piece with respect to the cross-spring joint, or in said second groove to define a second position of the spectacles side piece with respect to the cross-spring-joint, wherein the spectacles side piece can be rotated around the joint pin between said first and second positions, the first and second fork ends exerting a force on the spectacles side piece to bias the side piece into said first groove or said second groove;
• wherein a straddling of the first and second fork ends creates a stress in the fork spring, said stress exerting a pressure on the end of the spectacles side piece, so that the spectacles side piece snaps into either said first or second groove, whereby a snapping of the spectacles side piece to said first and second positions is made possible and an adequate pressure of the side pieces on the temples is provided;
• and
• wherein the spectacles side piece is capable of moving to a third position with respect to the spectacles frame, said spectacles side piece forming an angle greater than 90.degree. with respect to the spectacles frame in said third position, said third position of said spectacles side piece causing a straddling of the first and second fork ends whereby the fork spring is stressed.

A cross-spring-joint for affixing a spectacles side piece to a spectacles frame, the cross-spring-joint including a fork spring having a first fork end, a second fork end, and a joint pin fitting through bore-holes in the first and second fork ends, the cross-spring-joint comprising:

• a first groove provided in at least one of said first and second fork ends, said first groove defining a first longitudinal axis generally through said first groove, said first reference axis being substantially perpendicular to a central axis of the joint pin;
• a second groove provided in at least one of said first and second fork ends, said second groove defining a second longitudinal axis generally through said second groove, said second longitudinal axis being substantially perpendicular to said first longitudinal axis and said central axis of the joint pin;
• the spectacles side piece being capable of location between the first and second fork ends in said first groove to define a first position of the spectacles side piece with respect to the cross-spring joint, or in said second groove to define a second position of the spectacles side piece with respect to the cross-spring-joint, wherein the spectacles side piece can be rotated around the joint pin between said first and second positions, the first and second fork ends exerting a force on the spectacles side piece to bias the side piece into said first groove or said second groove;
• wherein said fork spring is stressed when said first and second fork ends are straddled with respect to each other;
• and
• wherein said spectacles side piece is capable of moving to a third position such that the angle of the spectacle side piece in the third position relative to the first position is greater than the angle of the spectacles side piece in the second position relative to the first position, the spectacles side piece in the third position causing a straddling of the first and second fork ends whereby the fork spring is stressed.