1. A threaded drive comprising a threaded spindle having a longitudinal axis; a catch nut which is in a screw engagement with said threaded spindle with a first clearance and which is rotatable relative to said threaded spindle about said longitudinal axis; a catch nut which is in a screw engagement with said threaded spindle with a second predetermined clearance which is greater than the first predetermined clearance, said catch nut being freely rotatable relative to said supporting nut without an interlocking positive connection but with a non-positive frictional cooperation in a peripheral direction, and also being clampingly engageable with said supporting nut and fixable on said supporting nut in a desired relative rotary position.
2. A threaded drive as defined in claim 1; and further comprising a clamping unit which brings said catch nut in the clamping engagement with said supporting nut.
3. A threaded engagement as defined in claim 2, wherein said clamping unit is formed so that after establishing the clamping engagement between said supporting nut and said catch nut it remains on a unit formed by said supporting nut and said catch nut.
4. A threaded engagement as defined in claim 2; and further comprising means for fixedly connecting said clamping unit with said supporting nut.
5. A threaded engagement as defined in claim 4, wherein said fixedly connecting means include screw pens.
6. A threaded engagement as defined in claim 2, wherein said catch nut has an outer peripheral surface which is formed at least partially as a conical surface narrowing in a direction facing away from said supporting nut, said clamping unit having a counter conical surface with which said conical surface cooperates.
7. A threaded engagement as defined in claim 2, wherein said catch nut has an engaging surface provided at a side facing away from said supporting nut, said clamping unit having an associated counter engaging surface with which engaging surface cooperates.
8. A threaded engagement as defined in claim 7, wherein said engaging surface of said supporting nut extends substantially orthogonal to said longitudinal axis.
9. A threaded engagement as defined in claim 2, wherein said clamping unit is formed so that after establishing the clamping engagement of the supporting nut and the catch nut it is releasable from said catch nut.
10. A threaded engagement as defined in claim 9, wherein said catch nut has an outer peripheral surface which is formed at least partially as a conical surface and narrows in a direction facing said supporting nut, said supporting nut having a counter conical surface with which said conical surface is clampingly engageable.
11. A threaded engagement as defined in claim 9, wherein said clamping unit has an inner thread, and said threaded spindle has an outer thread, which are bringable in a screw engagement with one another with a predetermined clearance.
12. A threaded engagement as defined in claim 1, wherein said supporting nut is formed as a body of revolution nut.
13. A threaded engagement as defined in claim 1, wherein said supporting nut is formed as a screw nut with an inner thread fixedly formed on it.
14. A threaded engagement as defined in claim 1, wherein said catch nut is composed of a light metal.
15. A threaded engagement as defined in claim 1, wherein said catch nut is composed of aluminum.
16. A threaded engagement as defined in claim 1, wherein said catching nut is comprised of a light metal alloy.
17. A threaded engagement as defined in claim 1, wherein said catch nut is comprised of an aluminum alloy.
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 disposable lid for a drinking cup comprising;
an annular mounting portion for scalingly engaging a brim of the drinking cup;
a substantially planar medial portion for covering an opening of the drinking cup;
a recess having at least two side walls, said side walls extending from said planar medial portion and converging toward one another forming an apex;
wherein said at least two side walls extend towards said apex at different angles with respect to a vertical plane of said recess including said apex;
wherein said at least two side walls converge together at a frangible portion formed in a deepest portion of the recess, and wherein a thickness of the lid material at the frangible portion is thinner than the lid material in other portions of the lid thereby allowing the frangible portion to be ruptured by a force exerted by an end of a straw as it is inserted into the frangible portion.
2. The lid as defined in claim 1, wherein one of the side walls of said recess slopes at an angle in the range of 30\xb0 to 60\xb0 with respect to said vertical plane and the other of said side walls of said recess slopes at an angle in the range of 0\xb0 to 10\xb0 with respect to said vertical plane.
3. The lid as defined in claim 1, wherein one of the side walls of said recess slopes at an angle in the range of 45\xb0 to 50\xb0 with respect to said vertical plane and the other of said side wall of said side walls of said recess slopes at an angle in the range of 2\xb0 to 5\xb0 with respect to said vertical plane.
4. The lid as defined in claim 1, wherein one of the side walls of said recess slopes at an angle of 47\xb0 with respect to said vertical plane and the other of said side walls of said recess slopes at an angle of 4\xb0 with respect to said vertical plane.
5. The lid as defined in claim 1, wherein said recess further includes end walls extending between said side walls, and said end walls of said recess slope toward one another in a direction from said medial portion of the lid to said apex.
6. The lid as defined in claim 5, wherein said end walls slope toward one another at an angle in the range of 0\xb0 to 10\xb0 with respect to a second vertical plane perpendicular to said vertical plane.
7. The lid as defined in claim 5, wherein said end walls slope toward one another at an angle in the range of 2\xb0 to 5\xb0 with respect to a second vertical plane perpendicular to said vertical plane.
8. The lid as defined in claim 5, wherein said end walls slope toward one another at an angle of 4\xb0 with respect to a second vertical plane perpendicular to said vertical plane.