Rack 1 moves in a straight line along axis x-x and has wedge-shaped tooth spaces b which engage the wedge-shaped teeth of link 2. Link 2 has inclined edge c-c. Rack 1 is in constant engagement with link 2 and its motion is stopped when the rack and link move to the left and reach the position shown where inclined edge c-c of link 2 comes into contact with inclined recess d-d of the base. Teeth a and tooth spaces b are right triangles.
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