Door assembly for walk-in bathtub

1. A door assembly for a walk-in bathtub, the door assembly comprising:

(a) a door shaped to fit a door threshold in a wall of a walk-in bathtub, wherein the door includes an outer side for fitting within a threshold in a wall of a walk-in bathtub and an interior side for facing an inside of a walk-in bathtub; and

(b) at least one hinge assembly that includes:

(i) a first axis mount for coupling to a threshold of a walk-in bathtub;

(ii) a second axis mount coupled to the outer side of the door, within a channel in the outer side of the door; and

(iii) a double axis hinge coupled to both of said first and second axis mounts, for thereby connecting the door to a threshold of a walk-in bathtub;

(c) wherein the double axis hinge, when the door is in an open position, opens the door toward an inside of a walk-in bathtub by pivoting about the first axis mount toward an inside of a walk-in bathtub as the door itself freely counter rotates about the second axis mount in a direction opposite that of the hinge, wherein the interior side of the door faces an inside of a walk-in bathtub in both closed and opened positions.

2. The door assembly according to claim 1 , further comprising a door frame for mounting in a door threshold of a walk-in bathtub, wherein the first axis mount is coupled to the frame.

3. The door assembly according to claim 1 , wherein the channel in the outer side of the door extends across a width of the door, and wherein the double axis hinge recesses into said channel in the outer side of the door in both the closed and opened positions.

4. A door assembly for a walk-in bathtub, comprising:

(a) a door shaped to fit a door threshold in a wall of a walk-in bathtub, wherein the door includes an outer side for fitting within a threshold in a wall of a walk-in bathtub and an interior side for facing an inside of a walk-in bathtub;

(b) at least one hinge assembly that includes:

(i) a first axis mount for coupling to a threshold of a walk-in bathtub;

(ii) a second axis mount coupled to the outer side of the door, within a channel in the outer side of the door; and

(iii) a double axis hinge coupled to both of said first and second axis mounts, for thereby connecting the door to a threshold of a walk-in bathtub;

(c) wherein the double axis hinge, when the door is in an open position, opens the door toward an inside of a walk-in bathtub by pivoting about the first axis mount toward an inside of a walk-in bathtub as the door itself freely counter rotates about the second axis mount in a direction opposite that of the hinge, wherein the interior side of the door faces an inside of a walk-in bathtub in both closed and opened positions; and

a panel covering the double axis hinge, wherein the second axis mount has a goose neck shape that creates a space between the second axis mount and the outer side of the door, wherein the end of said panel fits within said space when the door is in the opened position.

5. The door assembly according to claim 1 , wherein said second axis mount is positioned approximately in the middle of a width of the outer side of the door.

6. The door assembly according to claim 1 , wherein the door comprises two parts: an outer cap shaped to fit within a door threshold in a side of a walk-in bathtub; and an interior panel with a perimeter larger than a perimeter of a door threshold of a walk-in bathtub, wherein the interior panel assists in forming a water seal on an inside of a walk-in bathtub.

7. The door assembly according to claim 1 , further comprising at least one locking mechanism inside the door, wherein the locking mechanism comprises: a rotating mount; at least one locking lever; at least one locking pin for fitting within a recess in a door threshold in a walk-in bathtub; and at least one pin guide that holds the locking pin and maintains back and forth movement of the locking pin in a straight line; wherein a first end of the locking lever is pivotally coupled to the rotating mount and a second end of the locking lever is pivotally coupled to the locking pin; and wherein the locking lever pushes the locking pin into a recess in a door threshold of a walk-in bathtub when the rotating mount turns in a first direction, and wherein the locking lever pulls the locking pin out of a recess in a door threshold of a walk-in bathtub when the rotating mount turns in a second direction.

8. The door assembly according to claim 7 , wherein the locking mechanism is controlled by a handle coupled to the door.

9. The door assembly according to claim 1 , further comprising multiple hinge assemblies connecting the door to the bathtub and multiple channels within the door for such assemblies.

10. A walk-in bathtub, comprising:

(a) a bathtub having a wall with a door threshold therein;

(b) a door shaped to fit said threshold, wherein the door includes a outer side that fits within said threshold and an interior side that faces an inside of the bathtub; and

(c) at least one hinge assembly that includes:

(i) a first axis mount coupled to said threshold;

(ii) a second axis mount coupled to the outer side of the door, within a channel in the door; and

(iii) a double axis hinge coupled to both of said axis mounts, thereby connecting the door to the threshold;

(d) wherein the double axis hinge opens the door to the inside of the bathtub by pivoting about the first axis mount toward the inside of the bathtub as the door itself freely counter rotates about the second axis mount in a direction opposite that of the hinge, wherein the interior side of the door faces the inside of the bathtub in both the closed and opened positions.

11. The walk-in bathtub according to claim 10 , further comprising a door frame mounted in the door threshold, wherein the first axis mount is coupled to the frame.

12. The walk-in bathtub according to claim 10 , wherein the channel in the outer side of the door extends across the width of the door, and wherein the double axis hinge recesses into said channel in the outer side of the door in both the closed and opened positions.

13. A walk-in bathtub, comprising

(a) a bathtub having a wall with a door threshold therein;

(b) a door shaped to fit said threshold, wherein the door includes a outer side that fits within said threshold and an interior side that faces an inside of the bathtub;

(c) at least one hinge assembly that includes:

(i) a first axis mount coupled to said threshold;

(ii) a second axis mount coupled to the outer side of the door, within a channel in the door; and

(iii) a double axis hinge coupled to both of said axis mounts, thereby connecting the door to the threshold;

(d) wherein the double axis hinge opens the door to the inside of the bathtub by pivoting about the first axis mount toward the inside of the bathtub as the door itself freely counter rotates about the second axis mount in a direction opposite that of the hinge, wherein the interior side of the door faces the inside of the bathtub in both the closed and opened positions; and

a panel covering the double axis hinge, wherein the second axis mount has a goose neck shape that creates a space between the second axis mount and the outer side of the door, wherein the end of said panel fits within said space when the door is in the opened position.

14. The walk-in bathtub according to claim 10 , wherein the door comprises two parts: an outer cap shaped to fit within the door threshold in the side of the walk-in bathtub; and an interior panel with a perimeter larger than a perimeter of the door threshold, wherein the interior panel assists in forming a water seal on the inside of the bathtub.

15. The walk-in bathtub according to claim 10 , further comprising at least one locking mechanism inside the door, wherein the locking mechanism comprises: a rotating mount; at least one locking lever coupled; and at least one locking pin that fits within a recess in the door threshold; wherein a first end of the locking lever is coupled to the rotating mount and a second end of the locking lever is coupled to the locking pin; and wherein the locking lever pushes the locking pin into the recess in the door threshold when the rotating mount turns in a first direction, and wherein the locking lever pulls the locking pin out of the recess in the door threshold when the rotating mount turns in a second direction.

16. The walk-in bathtub according to claim 15 , wherein the locking mechanism is controlled by a handle coupled to the door.

17. The walk-in bathtub according to claim 10 , further comprising multiple hinge assemblies connecting the door to the bathtub and multiple channels within the outer side of the door for such assemblies.

18. The walk-in bathtub according to claim 10 , wherein the door threshold is located in a side wall of the bathtub.

19. The walk-in bathtub according to claim 10 , wherein the door threshold is located in an end of the bathtub opposite a built-in seat.

20. A door assembly for a walk-in bathtub, the door assembly comprising:

(a) a door shaped to fit a door threshold in a wall of a walk-in bathtub, wherein the door includes an outer side for fitting within a threshold of a walk-in bathtub and an interior side for facing an inside of a walk-in bathtub;

(b) at least one hinge assembly for connecting the door to a threshold of a walk-in bathtub; and

(c) at least one locking mechanism inside the door, wherein the locking mechanism includes:

(i) a rotating mount;

(ii) at least one locking lever;

(iii) at least one locking pin that fits within a recess in a door threshold of a walk-in bathtub; and

(iv) at least one pin guide that holds the locking pin and maintains back and forth movement of the locking pin in a straight line; wherein a first end of the locking lever is pivotally coupled to the rotating mount and a second end of the locking lever is pivotally coupled to the locking pin; and wherein the locking lever pushes the locking pin into a recess in a door threshold of a walk-in bathtub when the rotating mount turns in a first direction, and wherein the locking lever pulls the locking pin out of a recess in a door threshold of a walk-in bathtub when the rotating mount turns in a second direction.