Power device with flexible connection between a user interface assembly and an internal assembly

1 . An electric toothbrush comprising:

a tubular housing;

a user interface assembly connected to the tubular housing;

an internal assembly adapted to be inserted into the tubular housing by sliding the internal assembly along a longitudinal axis of the tubular housing;

a flexible ribbon cable adapted to interconnect the user interface assembly and internal assembly, and having

a first end portion coupled to the user interface assembly,

a flexible middle portion having a predetermined length that allows a second end portion of the flexible ribbon cable to extend out of a bottom portion of the tubular housing prior to insertion of the internal assembly into the tubular housing and that allows the second end portion of the flexible ribbon cable to be operatively coupled to the internal assembly when the internal assembly is at least partially outside of the housing; and

wherein, during insertion of the internal assembly into the housing, the flexible ribbon cable folds into a curved shape such that the flexible ribbon cable nests inside the tubular housing after the internal assembly is completely inserted and the flexible ribbon cable does not interfere with operation of the internal assembly.

2 . The electric toothbrush of claim 1 , wherein the curved shape includes an S-shape.

3 . The electric toothbrush of claim 1 , further comprising a strain relief member coupled to the internal assembly and interacting with the flexible ribbon cable to promote formation of the curved shape in a desired direction.

4 . The electric toothbrush of claim 3 , wherein the strain relief member includes an adhesive connection.

5 . The electric toothbrush of claim 1 , wherein the user interface assembly is coupled to an inside surface of the tubular housing.

6 . The electric toothbrush of claim 1 , wherein the internal assembly includes a primary printed circuit board.

7 . The electric toothbrush of claim 1 , wherein the user interface assembly includes one or more user interface elements integrated with the tubular housing and the flexible ribbon cable is coupled to at least one of the one or more user interface elements.

8 . A method for assembling an electric toothbrush comprising:

providing a tubular housing;

providing a user interface assembly and coupling the user interface assembly to an inside surface of the tubular housing;

providing an internal assembly and configuring the internal assembly to be disposed in the tubular housing;

providing a flexible ribbon cable for interconnecting the user interface assembly and the internal assembly;

coupling the flexible ribbon cable to the user interface assembly such that it extends out of a bottom portion of the tubular housing prior to insertion of the internal assembly thereby allowing enough length for connecting the flexible ribbon cable outside of the housing to the internal assembly;

inserting the internal assembly into the tubular housing resulting in the flexible ribbon cable making a curved configuration; and

having the flexible ribbon cable nested inside the tubular housing after the internal assembly is completely inserted without interfering with operation of the internal assembly.

9 . The method of claim 8 , wherein the internal assembly includes a primary printed circuit board.

10 . The method of claim 8 , wherein the internal assembly further comprises a strain relief member coupled to the internal assembly and interacting with the flexible ribbon cable to promote formation of the curved configuration in a desired direction.

11 . The method of claim 8 , wherein the user interface assembly includes one or more user interface elements integrated with the tubular housing and the flexible ribbon cable is coupled to at least one of the one or more user interface elements.