Patent ID: 7506557

Claim:
An anti-backlash nut mechanism, comprising: first and second nuts arranged to be engaged with a male screw; biasing means for biasing said first and second nuts in a direction of changing a distance between them; receiving means formed in conjunction with said first nut to receive said second nut and said biasing means; projecting means projecting in a radial direction from said second nut; grooves which are formed around said receiving means so as to receive said projecting means from an edge of said receiving means and to engage with said projecting means in a turning direction of said nuts, said grooves extending through a peripheral wall of said receiving means; and slip-out stopping means for preventing said second nut and said biasing means, which are inserted into said receiving means, from slipping out of said receiving means, wherein said slip-out stopping means has resilience enabling it to be removably attached to said receiving means.