1. A drive unit operable to translate and rotate a shaft, said drive unit comprising:
a hollow electric motor having a rotor;
a fluid cylinder;
means for connecting said shaft to the rotor of said hollow electric motor;
means permitting said shaft to move lengthwise coupled with said fluid cylinder; and
means connecting said fluid cylinder to said shaft;
whereby said shaft may be rotated by said hollow electric motor and moved lengthwise by said fluid cylinder; and
wherein said fluid cylinder has an outer wall coupled with said rotor.
2. The drive unit according to claim 1, wherein:
said means for connecting said shaft to the rotor includes:
the means permitting said shaft to move lengthwise.
3. The drive unit according to claim 2, wherein:
said fluid cylinder encircles said hollow electric motor.
4. The drive unit according to any one of claims 2 and 3, wherein:
said means permitting said shaft to move lengthwise is formed on said interior surface of said fluid cylinder.
5. The drive unit according to claim 1, wherein:
said means permitting said shaft to move lengthwise includes:
a spline insert on a wall of said fluid cylinder, and
splines on said shaft.
6. The drive unit according to claim 2, wherein:
said means for connecting said shaft to the rotor includes:
a spline insert on a wall of said fluid cylinder; and
splines on said shaft.
7. The drive unit according to claim 5, wherein:
said fluid cylinder includes:
a piston attached to an end of said shaft.
8. The drive unit according to claim 1, wherein:
said rotor of said hollow electric motor is firmly attached to an outer wall of said fluid cylinder.
9. The drive unit according to claim 5, wherein:
said spline insert on said wall of said fluid cylinder is intermediate ends of said fluid cylinder.
10. The drive unit according to any one of claims 1 and 2, wherein:
said hollow electric motor includes:
a stator, and said rotor has a width substantially greater than said stator.
11. The drive unit according to claim 10, wherein:
said rotor has a width substantially equal to a combined width of said stator and a stroke of a piston in said fluid cylinder.
12. The drive unit according to claim 11, wherein:
said rotor is firmly attached to said piston and moves lengthwise with said piston.
13. The drive unit according to any one of claims 1 and 2, wherein:
said hollow electric motor includes:
a stator, and said stator has a width substantially greater than said rotor.
14. The drive unit according to claim 13, wherein:
said stator has a width substantially equal to a combined width of said rotor and a stroke of a piston in said fluid cylinder.
15. The drive unit according to claim 14, wherein:
said rotor is firmly attached to said piston and moves lengthwise with said piston.
16. The drive unit according to claim 1, wherein:
said fluid cylinder rotates on bearings on a fixed motor housing.
17. The drive unit according to claim 16, wherein:
said fluid cylinder includes:
a piston, and
said fluid cylinder, said piston and said rotor rotate as a single unit, and said piston moves lengthwise within said fluid cylinder.
18. The drive unit according to claim 1, wherein:
said drive unit includes:
a motor housing, and said fluid cylinder is attached to an outer wall of said motor housing.
19. The drive unit according to claim 9, wherein:
said shaft rotates on bearings on a motor housing.
20. The drive unit according to claim 9, wherein:
said drive unit includes:
a motor housing; and
said fluid cylinder is located along a periphery wall of said motor housing.
21. The drive unit according to claim 19, wherein
said rotor is firmly attached to said shaft and moves lengthwise with said shaft.
22. The drive unit of any one of claims 1, 2, 5, 20 and 21, wherein:
said fluid cylinder is at least partially situated within confines of said hollow electric motor.
23. The drive unit according to claim 4, wherein:
said means for connecting said shaft to the rotor includes:
a spline insert on a wall of said fluid cylinder; and
splines on said shaft.
24. The drive unit according to claim 23, wherein:
said fluid cylinder includes:
a piston attached to an end of said shaft.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A clip for holding an auxiliary eyeglass unit on a primary eyeglass unit, said clip comprising:
a retaining member including
an upright front plate,
an upright intermediate plate unit disposed behind and parallel to said front plate, and
a horizontal top plate having front and rear sides that are formed respectively and integrally with upper ends of said front plate and said intermediate plate unit to define a front receiving space among said front plate, said intermediate plate unit and said top plate, said front receiving space being adapted to receive an upper end of the auxiliary eyeglass unit fittingly, said front plate and said intermediate plate unit being formed respectively with front and rear projection units that are adapted to perforate respectively into front and rear sides of the auxiliary eyeglass unit so as to retain the auxiliary eyeglass unit on said retaining member; and
a supporting member including
an upright rear plate disposed behind and parallel to said intermediate plate unit, and
a horizontal connecting plate having a front side that is connected fixedly to said top plate of said retaining member, and a rear side that is formed integrally with an upper end of said rear plate to define a rear receiving space among said intermediate plate unit, said rear plate and said connecting plate, said rear receiving space being adapted to receive an upper end of the primary eyeglass unit fittingly so as to position said retaining member relative to the primary eyeglass unit.
2. The clip as claimed in claim 1, wherein said front plate of said retaining member has vertical left and right sides that are formed respectively with two vertical rows of teeth which constitute said front projection unit, said intermediate plate unit including a pair of coplanar upright left and right intermediate plates that extend respectively and downwardly from said rear side of said top plate and that are spaced apart from each other, said left intermediate plate having a vertical left side that is aligned with said left side of said front plate and that is formed with a row of teeth which is staggered with respect to said teeth on said left side of said front plate, said right intermediate plate having a vertical right side that is aligned with said right side of said front plate and that is formed with a row of teeth which is staggered with respect to said teeth on said right side of said front plate, said teeth of said left and right intermediate plates constituting said rear projection unit, said supporting member being disposed between said left and right intermediate plates.
3. The clip as claimed in claim 2, wherein each of said front plate, and said left and right intermediate plates has a horizontal bottom side, said front projection unit further including a horizontal row of teeth that is formed on said bottom side of said front plate, said rear projections further including two horizontal rows of teeth that are formed respectively on said bottom sides of said left and right intermediate plates.
4. The clip as claimed in claim 2, wherein each of said left and right intermediate plates has a lower end that is disposed above that of said front plate.
5. The clip as claimed in claim 2, wherein said front side of said connecting plate of said supporting member is formed integrally with said top plate of said retaining member.
6. The clip as claimed in claim 2, wherein each of said front plate as well as said left and right intermediate plates is formed with a sharp blade portion along an outer periphery thereof, said blade portion of said front plate constituting said front projection unit, said blade portions of said left and right intermediate plates constituting said rear projection unit.
7. The clip as claimed in claim 1, wherein said intermediate plate unit includes an intermediate plate, each of said front and intermediate plates having left and right sides, said left and right sides of said front plate being aligned respectively with said left and right sides of said intermediate plate, said front side of said connecting plate of said supporting member being welded to said retaining member at a junction between said top plate and said intermediate plate.