Gear for converting a rotary into a translational motion

An arrangement for converting rotary motion into translational motion, comprising:

• driving motor means;
• rotary drive means connected to said motor means;
• motion-transmission means moveable translationally and divided logitudinally along a direction of motion into two strings;
• guide means for guiding said strings transversely, said strings being positioned outside said guide means at one end and separated from each other, said strings being united at the other end inside said guide means, said guide means preventing the united end of the strings from being laterally removable from each other;
• engagement means for connecting said strings to said rotary drive means where they are united, said strings having teeth on sides facing each other in vicinity of said guide means, said strings engaging each other by said teeth;
• an intermediate component in said guide means remote from said rotary drive means, said strings having ends secured to said intermediate component, said intermediate component being common to both strings;
• said strings being disengaged from said engagement means in vicinity of said intermediate component;
• a worm extending along said guide means and engaging a worm-engagement thread on facing sides of said strings in vicinity of said guide means and adjacent to a section of said strings carrying said teeth, said worm connecting said strings to said rotary drive means at a location where said strings are united, said teeth extending substantially perpendicular to a longitudinal axis of said guide means, said worm-engagement thread being divided into two halves by an axial midplane, said strings being connected to said intermediate component, said intermediate component having a hollow space inside said component and extending along said guide means, said hollow space being axially longer than the thread on said worm.

An arrangement for converting rotary motion into translational motion, comprising:

• driving motor means;
• rotary drive means connected to said motor means;
• motion-transmission means moveable translationally and divided longitudinally along a direction of motion into two strings;
• guide means for guiding said strings transversely, said strings being positioned outside said guide means at one end separated from each other, said strings being united at the other end inside said guide means, said guide means preventing the united end of the strings from being laterally removable from each other;
• engagement means for connecting said strings to said rotary drive means where they are united, said strings having teeth on sides facing each other in vicinity of said guide means, said strings engaging each other by said teeth;
• an intermediate component in said guide means remote from said rotary drive means, said strings having ends secured to said intermediate component, said intermediate component being common to both strings;
• said strings being disengaged from said engagement means in vicinity of said intermediate component;
• a worm extending along said guide means and engaging a worm-engagement thread on facing sides of said strings in vicinity of said guide means and adjacent to a section of said strings carrying said teeth, said worm connecting said strings to said rotary drive means at a location where said strings are united, said teeth extending substantially perpendicular to a longitudinal axis of said guide means, said worm-engagement thread being divided into two halves by an axial midplane, said strings being connected to said intermediate component, said intermediate component having a hollow space inside said component and extending along said guide means, said hollow space being axially longer than the thread of said worm;
• said intermediate component having a cylindrical hollow space extending coaxial with a worm-engagement thread on said strings and extending also coaxial with said worm, said cylindrical hollow space surrounding with play radially an outer demarcation of the thread on said worm in vicinity of disengagement of said strings from said engagement means;
• said intermediate component remaining inside said guide means at every stage of displacement of said motion-transmission means, said intermediate component having walls along said guide means;
• and a tubular member secured against said walls;
• said guide means having a slot therein and along said guide means, said intermediate component having a connector section oriented toward said slot.