Massage device with a shaft transmission mechanism

1. A massage device, comprising:

(a) a base cover having a longitudinal axis and at least one guiding rail formed parallel to the longitudinal axis;

(b) a rack is formed in the base cover and paralleled to the at least one guiding rail;

(c) a carriage having a chassis member and a shield member placed over the chassis member to form a chamber therebetween, wherein the chassis member has a plurality of grooves formed such that when the carriage is engaged with the base cover, the plurality of guiding rails is received in the plurality of grooves of the chassis member and the carriage is longitudinally movable back and forth along the plurality of guiding rails of the base cover;

(d) a transmission assembly received in the chamber and secured in the carriage, having

(i) a motor having an output shaft;

(ii) a worm mechanically coupled with the output shaft of the motor;

(iii) a worm wheel meshing with the worm;

(iv) a transmission shaft having a first end portion, an opposite, second end portion, a shaft body defined therebetween, and an axis, wherein the shaft body has a cross-sectional shape of a polygon, and wherein the transmission shaft is mechanically coupled with the worm wheel by the first end portion;

(v) a first lead gear having an exterior surface defining a gear, and an interior surface defining a polygon bore, wherein the polygon bore is adapted for receiving the transmission shaft such that when the polygon bore of the first lead gear receives the transmission shaft, the first lead gear is slidably movable back and forth along the transmission shaft, while not rotatable relative to the transmission shaft around the axis of the transmission shaft;

(vi) a pair of pinion gears meshing with the first lead gear;

(vii) a second lead gear, having a first gear portion meshing with one of the pair of pinion gears, a second gear portion meshing with the other of the pair of pinion gears, and a third gear portion formed therebetween, the third gear portion meshing with the rack;

(viii) a first bevel gear having an exterior surface, an interior surface defining a polygon bore, and a conically gear formed on the exterior surface, wherein the polygon bore is adapted for receiving the transmission shaft such that when the polygon bore of the first bevel gear receives the transmission shaft, the first bevel gear is slidably movable back and forth along the transmission shaft, while not rotatable relative to the transmission shaft around the axis of the transmission shaft;

(ix) a second bevel gear having a conical gear meshing with the conical gear of the first bevel gear and a cylindrical gear extending from the conical gear;

(x) a pair of first gears meshing with the cylindrical gear of the second bevel gear; and

(xi) a pair of second gears, each meshing with a corresponding one of the pair of first gears, wherein the pair of second gears is engaged with the massage assembly,

wherein when the motor is activated, it drives the worm to rotate, the rotation of the worm results in, in turn, the rotations of the worm wheels, the transmission shaft, the first lead gear, the first bevel gear, the second bevel gear, the pair of first gears and the pair of second gears, wherein the rotation of the first lead gear results in, in turn, the rotation of the pair of pinion gears, and the second lead gear, thereby moving the carriage along the plurality of the guiding rails of the base cover; and

(e) a massage assembly having a pair of massage members, each massage member comprising:

(i) a driving member having an eccentric wheel and an eccentric block,

wherein the eccentric wheel has a first planar surface, a second planar surface tilted to the first planar surface at an angle β, a third planar surface parallel to the second planar surface, a first cylindrical portion defined between the first planar surface and the second planar surface, a second cylindrical portion defined between the second planar surface and the third planar surface, and a shaft bore defined through the first cylindrical portion and the second cylindrical portion, wherein the first cylindrical portion has a central axis substantially perpendicular to the first planar surface, and a diameter, d 1 , wherein the second cylindrical portion has a central axis substantially perpendicular to the second planar surface and defining an angle α, relative to the central axis of the first cylindrical portion, and a diameter, d 2 , less than the diameter d 1 of the first cylindrical portion, and wherein the shaft bore has a central axis that is substantially coincident with the central axis of the first cylindrical portion; and

wherein the eccentric block has a first planar surface and a second planar surface defining a cylinder body therebetween, wherein the cylinder body has a central axis and a diameter, d 3 , greater than the diameter d 2 of the second cylindrical portion of the eccentric wheel, and the first planar surface a is tilted to the second planar surface at an angle γ;

(ii) a massage bracket having a first surface and an opposite, second surface defining a bracket body therebetween, a central axis and a plurality of stumps spaced-apart on the first surface, wherein the bracket body defines a first opening in the central region; and

(iii) a plurality of massage heads,

wherein as assembled, the plurality of massage heads is attached to the plurality of stumps of the massage bracket, respectively, the second cylindrical portion of the eccentric wheel is received in the first opening of the massage bracket, the eccentric block is mounted to the second cylindrical portion of the eccentric wheel such that the first planar surface of the eccentric block is substantially in contact with and parallel to the third planar surface of the eccentric wheel, the central axis of the cylinder body of the eccentric block is substantially coincident with the central axis of the first cylindrical portion of the eccentric wheel and the central axis of the massage bracket is substantially coincident with the central axis of the second cylinder portion of the eccentric wheel, and the massage bracket operably cooperates with the second cylindrical portion of the eccentric wheel.

2. The massage device of claim 1 , wherein each massage member further comprises a gear shaft having a first end portion and an opposite, second end portion, wherein the gear shaft extends through the shield member of the carriage and is coaxially mounted to the corresponding second gear by the first end portion, while received in the shaft bore of the eccentric wheel by the second end portion.

3. The massage device of claim 2 , wherein each massage member further comprises means for limiting the massage bracket from rotating along the central axis of the first cylindrical portion of the eccentric wheel.

4. The massage device of claim 3 , wherein the limiting means comprises a U-shape fixture or a fixture bar mounted to the shield member of the carriage.

5. The massage device of claim 4 , wherein in operation, the motor drives the transmission shaft to rotate, which in turn, drives the carriage to move along the plurality of the guiding rails of the base cover and the driving member of the massage assembly to rotate, the rotation of the driving member of the massage assembly drives the massage bracket to gyrate in a way of which its central axis rotates along the central axis of the first cylindrical portion of the eccentric wheel in the angle α, thereby causing the plurality of massage heads to move alternatively along a direction parallel to the central axis of the first cylindrical portion of the eccentric wheel so as to provide a massage effect to a user.

6. The massage device of claim 1 , wherein each of the angles α, β and γ is greater than zero but less than 90°, preferably, greater than zero but less than 45°.

7. The massage device of claim 6 , wherein β=α, and γ=α.

8. The massage device of claim 1 , wherein each of the plurality of massage heads has a mushroom-shape.

9. The massage device of claim 8 , wherein each of the plurality of massage heads comprises a first structure, a mushroom-shape node and a second structure placed between the first structure and the mushroom-shape node.

10. The massage device of claim 1 , wherein each of the plurality of massage heads comprises an energy source of capable of generating at least one of thermal energy and photonic energy.

11. The massage device of claim 10 , wherein the source energy comprises a lamp base mounted to the corresponding one of the plurality of stumps, a PCB board attached to the lamp base, and heating lamps attached onto the PCB board.

12. A massage device, comprising:

(a) a transmission assembly having:

(i) a motor having an output shaft;

(ii) a worm mechanically coupled with the output shaft of the motor;

(iii) a worm wheel meshing with the worm;

(iv) a transmission shaft having a first end portion, an opposite, second end portion, a shaft body defined therebetween, and an axis, wherein the shaft body has a cross-sectional shape of a polygon, and wherein the transmission shaft is mechanically coupled with the worm wheel by the first end portion;

(v) a first lead gear having an exterior surface defining a gear, and an interior surface defining a polygon bore, wherein the polygon bore is adapted for receiving the transmission shaft such that when the polygon bore of the first lead gear receives the transmission shaft, the first lead gear is slidably movable back and forth along the transmission shaft, while not rotatable relative to the transmission shaft around the axis of the transmission shaft;

(vi) a pair of pinion gears meshing with the first lead gear;

(vii) a second lead gear, having a first gear portion meshing with one of the pair of pinion gears, a second gear portion meshing with the other of the pair of pinion gears, and a third gear portion formed therebetween;

(viii) a first bevel gear having an exterior surface, an interior surface defining a polygon bore, and a conically gear formed on the exterior surface, wherein the polygon bore is adapted for receiving the transmission shaft such that when the polygon bore of the first bevel gear receives the transmission shaft, the first bevel gear is slidably movable back and forth along the transmission shaft, while not rotatable relative to the transmission shaft around the axis of the transmission shaft;

(ix) a second bevel gear having a conical gear meshing with the conical gear of the first bevel gear and a cylindrical gear extending from the conical gear;

(x) a pair of first gears meshing with the cylindrical gear of the second bevel gear; and

(xi) a pair of second gears, each meshing with a corresponding one of the pair of first gears, wherein the pair of second gears is engaged with the massage assembly,

wherein when the motor is activated, it drives the worm to rotate, the rotation of the worm results in, in turn, the rotations of the worm wheels, the transmission shaft, the first lead gear, the first bevel gear, the second bevel gear, the pair of first gears and the pair of second gears, wherein the rotation of the first lead gear results in, in turn, the rotation of the pair of pinion gears, and the second lead gear; and

(b) a massage assembly having a plurality of massage heads, engaged with the transmission assembly such that the rotation of the pair of second gears drives the plurality of massage heads to move in a predefined way so as to provide massage effects, while the rotation of the second lead gear drives the massage assembly to move along a direction parallel to the transmission shaft.

13. The massage device of claim 12 , further comprising:

(a) a base cover having a longitudinal axis and at least one guiding rail formed parallel to the longitudinal axis;

(b) a rack in formed in the base cover and paralleled to the at least one guiding rail; and

(c) a carriage for receiving and securing the transmission assembly therein, having a chassis member and a shield member placed over the chassis member to form a chamber therebetween, wherein the chassis member has a plurality of grooves formed such that when the carriage is engaged with the base cover, the at least one guiding rail is received in the plurality of grooves of the chassis member and the carriage is longitudinally movable back and forth along the plurality of guiding rails of the base cover.

14. The massage device of claim 13 , wherein the massage assembly having a pair of massage members, each massage member comprising:

(i) a driving member having an eccentric wheel and an eccentric block, wherein the eccentric wheel has a first planar surface, a second planar surface tilted to the first planar surface at an angle β, a third planar surface parallel to the second planar surface, a first cylindrical portion defined between the first planar surface and the second planar surface, a second cylindrical portion defined between the second planar surface and the third planar surface, and a shaft bore defined through the first cylindrical portion and the second cylindrical portion, wherein the first cylindrical portion has a central axis substantially perpendicular to the first planar surface, and a diameter, d 1 , wherein the second cylindrical portion has a central axis substantially perpendicular to the second planar surface and defining an angle α relative to the central axis of the first cylindrical portion, and a diameter, d 2 , less than the diameter d 1 of the first cylindrical portion, and wherein the shaft bore has a central axis that is substantially coincident with the central axis of the first cylindrical portion; and

wherein the eccentric block has a first planar surface and a second planar surface defining a cylinder body therebetween, wherein the cylinder body has a central axis and a diameter, d 3 , greater than the diameter d 2 of the second cylindrical portion of the eccentric wheel, and the first planar surface is tilted to the second planar surface at an angle γ; and

(ii) a massage bracket having a first surface and an opposite, second surface defining a bracket body therebetween, a central axis and a plurality of stumps spaced-apart on the first surface, wherein the bracket body defines an opening therethrough in the central region,

wherein as assembled, the plurality of massage heads is attached to the plurality of stumps of the massage bracket, respectively, the second cylindrical portion of the eccentric wheel is received in the opening of the massage bracket; the eccentric block is mounted to the second cylindrical portion of the eccentric wheel such that the first planar surface of the eccentric block is substantially in contact with and parallel to the third planar surface of the eccentric wheel, the central axis of the cylinder body of the eccentric block is substantially coincident with the central axis of the first cylindrical portion of the eccentric wheel, the central axis of the massage bracket is substantially coincident with the central axis of the second cylinder portion of the eccentric wheel, and the massage bracket operably cooperates with the second cylindrical portion of the eccentric wheel.

15. The massage device of claim 14 , wherein each massage member further comprises a gear shaft having a first end portion and an opposite, second end portion, wherein the gear shaft extends through the shield member of the carriage and is coaxially mounted to the corresponding second gear of the transmission assembly by the first end portion, while received in the shaft bore of the eccentric wheel by the second end portion.

16. The massage device of claim 15 , wherein each massage member further comprises means for limiting the massage bracket from rotating along the central axis of the first cylindrical portion of the eccentric wheel.

17. The massage device of claim 16 , wherein the limiting means comprises a U-shape fixture or a fixture bar mounted to the shield member of the carriage.

18. The massage device of claim 17 , wherein in operation, the motor drives the transmission shaft to rotate, which in turn, drives the carriage to move along the plurality of the guiding rails of the base cover and the driving member of the massage assembly to rotate, the rotation of the driving member of the massage assembly drives the massage bracket to gyrate in a way of which its central axis rotates along the central axis of the first cylindrical portion of the eccentric wheel in the angle α, thereby causing the plurality of massage heads to move alternatively along a direction parallel to the central axis of the first cylindrical portion of the eccentric wheel so as to provide a massage effect to a user.

19. A transmission assembly usable for a massage device, comprising:

(a) a motor having an output shaft;

(b) a worm mechanically coupled with the output shaft of the motor;

(c) a worm wheel meshing with the worm;

(d) a transmission shaft having a first end portion, an opposite, second end portion, a shaft body defined therebetween, and an axis, wherein the shaft body has a cross-sectional shape of a polygon, and wherein the transmission shaft is mechanically coupled with the worm wheel by the first end portion;

(e) a first lead gear having an exterior surface defining a gear, and an interior surface defining a polygon bore, wherein the polygon bore is adapted for receiving the transmission shaft such that when the polygon bore of the first lead gear receives the transmission shaft, the first lead gear is slidably movable back and forth along the transmission shaft, while not rotatable relative to the transmission shaft around the axis of the transmission shaft;

(f) a pair of pinion gears meshing with the first lead gear;

(g) a second lead gear, having a first gear portion meshing with one of the pair of pinion gears, a second gear portion meshing with the other of the pair of pinion gears, and a third gear portion formed therebetween;

(h) a first bevel gear having an exterior surface, an interior surface defining a polygon bore, and a conically gear formed on the exterior surface, wherein the polygon bore is adapted for receiving the transmission shaft such that when the polygon bore of the first bevel gear receives the transmission shaft, the first bevel gear is slidably movable back and forth along the transmission shaft, while not rotatable relative to the transmission shaft around the axis of the transmission shaft;

(i) a second bevel gear having a conical gear meshing with the conical gear of the first bevel gear and a cylindrical gear extending from the conical gear;

(j) a pair of first gears meshing with the cylindrical gear of the second bevel gear; and

(k) a pair of second gears, each meshing with a corresponding one of the pair of first gears, wherein the pair of second gears is engaged with the massage assembly,

wherein when the motor is activated, it drives the worm to rotate, the rotation of the worm results in, in turn, the rotations of the worm wheels, the transmission shaft, the first lead gear, the first bevel gear, the second bevel gear, the pair of first gears and the pair of second gears, wherein the rotation of the first lead gear results in, in turn, the rotation of the pair of pinion gears, and the second lead gear.