1. A roller screw mechanism provided with a screw comprising:
an external thread,
a nut surrounding and coaxial with the screw, the nut having an internal thread, two gear wheels mounted in a non-threaded part of the nut, each gear wheel including a first set of teeth having a plurality of internal teeth, and a plurality of rollers radially located between the screw and the nut, each of the plurality of rollers providing a roller external thread designed to engage the external and internal threads of the screw and the nut, respectively, and axially at each end a first set of roller teeth having a plurality of gear teeth designed to engage with the plurality of internal teeth of the gear wheels,
wherein an outer diameter of the first set of roller teeth of each of the plurality of rollers is less or equal to a diameter of a thread root of the roller external thread of the plurality of rollers,
wherein the addendum of each tooth of the plurality of gear teeth of each of the plurality of rollers is equal to zero.
2. The roller screw mechanism according to claim 1, wherein each roller further comprises, at each end, a cylindrical stud axially extending from the plurality of gear teeth of the roller, and designed to be fitted inside cylindrical through-out recesses provided on an annular spacer ring mounted radially between the external thread of the screw and the associated gear wheel.
3. The roller screw mechanism according to claim 1, wherein the hardness of the gear wheels is substantially similar to the hardness of the rollers.
4. A roller screw mechanism provided with a screw comprising:
an external thread,
a nut surrounding and coaxial with the screw, the nut having an internal thread, two gear wheels mounted in a non-threaded part of the nut, each gear wheel including a first set of teeth having a plurality of internal teeth, and a plurality of rollers radially located between the screw and the nut, each of the plurality of rollers providing a roller external thread designed to engage the external and internal threads of the screw and the nut, respectively, and axially at each end a first set of roller teeth having a plurality of gear teeth designed to engage with the plurality of internal teeth of the gear wheels,
wherein an outer diameter of the first set of roller teeth of each of the plurality of rollers is less or equal to a diameter of a thread root of the roller external thread of the plurality of rollers, and
wherein each of the plurality of gear teeth of each roller has, in cross section, a concave profile curve and each of the plurality of internal teeth of each gear wheel has, in cross section, a convex profile curve.
5. The roller screw mechanism according to claim 4, wherein a tooth profile curve of the gear wheels and the plurality of rollers is defined by a circular arc.
6. The roller screw mechanism according to claim 4, wherein a tooth profile curve of the gear wheels and the plurality of rollers is defined by a hypocycloid curve.
7. The roller screw mechanism according to claim 6, wherein a portion of each concave tooth of each roller in contact with a convex tooth of the associated gear wheel has, in cross section, a hypocycloid profile.
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 method comprising:
(a) generating at a first data-processing system a first ringback signal for a call that originates at a telecommunications terminal, wherein the content of the first ringback signal is specified by the user of the telecommunications terminal and depends on the value of a physiological parameter of the user who places the call, wherein the value of the physiological parameter is measured by a sensor and received by the first data-processing system; and
(b) transmitting from the first data-processing system the first ringback signal to the telecommunications terminal.
2. The method of claim 1 further comprising (c) muting a second ringback signal, wherein the second ringback signal is generated by a second data-processing system.
3. The method of claim 1 further comprising (c) transmitting a second ringback signal to the originating terminal, wherein the second ringback signal is generated by a second data-processing system.
4. The method of claim 3 wherein the first ringback signal and the second ringback signal are transmitted concurrently.
5. The method of claim 1 wherein the ringback signal represents an instance of a musical composition, and wherein the value of a property of the instance is specified by the user of the telecommunications terminal, and wherein the property is independent of melody.
6. The method of claim 5 wherein the property is one of tempo, timbre, volume, and pitch.
7. A method comprising:
(a) receiving at a first data-processing system a signal from a second data-processing system, wherein the signal indicates that one or more resources have been allocated to handle a call that originates from a telecommunications terminal;
(b) generating at the first data-processing system a first ringback signal after receiving the signal, wherein:
i. the first ringback signal comprises an animation, and
ii. the speed of the animation depends on the value of a physiological parameter of the user who places the call, wherein the value of the physiological parameter is measured by a sensor; and
(c) transmitting the first ringback signal to the telecommunications terminal.
8. The method of claim 7 wherein the content of the first ringback signal is specified by the user of the telecommunications terminal.
9. The method of claim 7 further comprising (d) muting a second ringback signal, wherein the second ringback signal is generated by the second data-processing system.
10. The method of claim 7 further comprising (d) transmitting a second ringback signal to the telecommunications terminal, wherein the second ringback signal is generated by the second data-processing system.
11. The method of claim 10 wherein the first ringback signal and the second ringback signal are transmitted concurrently.
12. A method comprising:
(a) receiving at a first data-processing system a first ringback signal from a second data-processing system, wherein
i. the first ringback signal corresponds to a call that originates from a first telecommunications terminal, and
ii. the first ringback signal comprises a first animation;
(b) generating at the first data-processing system a second ringback signal after receiving the first ringback signal, wherein the second ringback signal comprises a second animation; and
(c) transmitting the second ringback signal, in place of the first ringback signal, to the first telecommunications terminal wherein the speed of the second animation is based on dynamic information that is extrinsic to the first data-processing system.
13. The method of claim 12 wherein the call is directed to a second telecommunications terminal, and wherein the second ringback signal conveys information about the user of the second telecommunications terminal.
14. The method of claim 12 wherein the call is directed to a user, and wherein the second ringback signal conveys information about a second telecommunications terminal to which the call is routed.
15. The method of claim 14 wherein the information comprises one or more capabilities of the second telecommunications terminal.
16. The method of claim 14 wherein the information comprises the geo-location of the second telecommunications terminal.