Leadscrew assembly

A leadscrew assembly comprising:

• a leadscrew having an external thread;
• and
• first and second ball bearings disposed such that a segment of each of the inner races thereof contacts diametrically opposing portions of said leadscrew, said ball bearing being of the type having inner race and outer race and being disposed such that a segment of the inner race contacts diametrically opposing portions of said leadscrew;
• a housing having retaining means for retaining said ball bearings in a preselected position with respect to said leadscrew, said retaining means comprising:
• a recess for receiving one end of said first and second ball bearings;
• means for retaining said first and second ball bearings at the same tracking angle as said leadscrew but at opposite angles with respect to an axis of rotating of said leadscrew;
• and
• a leaf spring;
• and
• retention pin disposed in said housing such that it maintains said leaf spring in tension against said first and second ball bearings.

A leadscrew assembly comprising:

• a leadscrew having an external thread;
• and
• first and second ball bearings disposed such that a segment of each of the inner races thereof contacts diametrically opposing portions of said leadscrew, said ball bearing being of the type having inner race and outer race and being disposed such that a segment of the inner race contacts diametrically opposing portions of said leadscrew;
• a housing having retaining means for retaining said ball bearings in a preselected position with respect to said leadscrew, said retaining means comprising:
• a recess for receiving one end of said first and second ball bearings, wherein the recess extends into the bottom wall of said housing and is disposed substantially perpendicular to an axis of rotation of said leadscrew;
• means for retaining said first and second ball bearings at the same tracking angle as said leadscrew but at opposite angles with respect to an axis of rotating of said leadscrew.

A leadscrew assembly comprising:

• a leadscrew having an external thread;
• and
• first and second ball bearings disposed such that a segment of each of the inner races thereof contacts diametrically opposing portions of said leadscrew, said ball bearing having an inner race and an outer race disposed such that a segment of the inner race contacts diametrically opposing portions of said leadscrew, and wherein said first and second ball bearings are disposed at the same tracking angle as said external thread, and wherein said first and second ball bearings are disposed at the same helix angle as said external thread but at opposite angles with respect to an axis of rotation of said leadscrew such that said first and second ball bearings engage the upper and lower portions of said external thread;
• means for urging said leadscrew against said first and second ball bearings which includes a third ball bearing having an inner race, said third ball bearing being disposed such that said inner race is substantially parallel with the axis of said leadscrew and in contact therewith.