Spectacles has bearing block attached to glass holder with bearing openings for pivot axle connected to frame arm, which carries cam acted upon by spring whose deflection it influences

摘要

The spectacles has frame arms pivotable between end positions joined to a holder. The arms tend to snap into the other end position when a certain angle is exceeded with respect to the current end position. A bearing block attached to the holder has openings for a pivot axle connected to a frame arm, a cam or similar acted upon by a spring whose deflection it influences. Maximum deflection is reached with the arm midway between end positions. The spectacles has a glass holder (11) and frame arms (14) joined to the holder and pivotable between folded and extended operating positions. The arms tend to snap into the other end position when a certain angle is exceeded with respect to the current end position. A bearing block (12) attached to the holder has two bearing openings (131,132) or recesses for a pivot axle connected to a frame arm, which carries a cam or similar eccentric device acted upon by a spring (123) whose deflection it influences. The maximum deflection is reached when the arm is about half way between end positions.