Apparatus and method to attach probe to junction box

1. A junction box for connecting to a sensor assembly of a probe, the sensor assembly having a housing and a plate, the junction box comprising:

a plurality of walls, one of the walls comprising:

an opening configured to accept insertion of the housing;

a mating area on an interior surface of said one of the walls, wherein the mating area comprises a perimeter encompassing the opening and wherein the mating area is sized and shaped to be congruent with the plate;

at least two stopper walls each projecting from the interior surface of said one of the walls and aligned proximate the perimeter of the mating area to obstruct the plate from rotating in a first rotational direction out of an assembled position;

at least two retaining flanges, wherein each of the at least two retaining flanges projects from one of the stopper walls and extends over the mating area at a distance offset from the interior surface of said one of the walls to obstruct the plate from moving out of the assembled position in a direction perpendicular to the interior surface of said one of the walls; and

at least one retainer spring comprising an interior edge aligned in a plane proximate the perimeter of the mating area and projecting outward from the interior surface of said one of the walls, wherein the at least one retainer spring is elastically deformable and configured to be pressed toward the interior surface of said one of the walls during assembly without permanently deforming and to return to a non-flexed position when the plate reaches the assembled position to obstruct rotation of the plate in a second rotational direction opposite the first rotational direction out of the assembled position.

2. The junction box of claim 1 , wherein each of the at least two retaining flanges extends over the mating area substantially parallel to the mating area.

3. The junction box of claim 1 , wherein each of the at least two stopper walls projects substantially perpendicularly from the mating area.

4. The junction box of claim 1 , wherein each of the at least two stopper walls has a first end and a second end, wherein the first end is tapered, and wherein each of the at least two retaining flanges are positioned on the second ends of the at least two stopper walls.

5. The junction box of claim 1 , wherein the mating area is shaped like a rectangle having four corners and four edges, and each of the at least two stopper walls extends from one of the corners along one of the edges.

6. The junction box of claim 1 , wherein the perimeter of the mating area has more than one edge and each of the at least two stopper walls extends a short length along an edge of the mating area with respect to the full length of the edge.

7. The junction box of claim 1 , wherein the perimeter of the mating area has at least one corner, wherein each of the at least two stopper walls has a first end and a second end, the first end being nearer to one of the corners than the second end to any of the corners, and wherein each of the at least two retaining flanges is positioned on the first ends of the at least two stopper walls.

8. The junction box of claim 1 wherein the at least one retainer spring comprises:

a base portion extending from the interior surface of said one of the walls substantially parallel to the interior surface of said one of the walls;

a stepped portion extending from the base portion and projecting outward from the interior surface of said one of the walls; and

a pressing portion extending from the stepped portion substantially parallel to the interior surface of said one of the walls,

wherein the pressing portion is configured to be pressed by the plate, and

wherein one of the stepped portion and the pressing portion is configured to obstruct rotation of the plate in the second rotational direction out of the assembled position.

9. The junction box of claim 1 , wherein the perimeter of the mating area has at least one corner, wherein the at least one retainer spring projects from the interior surface of said one of the walls along the perimeter of the mating area toward the at least one corner.

10. The junction box of claim 1 , wherein the mating area further comprises rests upon which the plate mates during assembly into the assembled position.

11. A junction box for connecting to a sensor assembly of a probe, the sensor assembly having a housing and a plate, the junction box comprising:

a plurality of walls, one of the walls comprising:

an opening configured to accept insertion of the housing;

a mating area on an interior surface of said one of the walls, wherein the mating area comprises a perimeter encompassing the opening and wherein the mating area is sized and shaped to be congruent with the plate;

at least two stopper walls each projecting from the interior surface of said one of the walls and aligned proximate the perimeter of the mating area to obstruct the plate from rotating in a first rotational direction out of an assembled position;

at least two retaining flanges, wherein each of the at least two retaining flanges projects from one of the stopper walls and extends over the mating area at a distance offset from the interior surface of said one of the walls to obstruct the plate from moving out of the assembled position in a direction perpendicular to the interior surface of said one of the walls; and

at least one retainer spring comprising an interior edge, a base portion, a stepped portion, and a pressing portion, wherein the interior edge is aligned in a plane proximate the perimeter of the mating area and projecting outward from the interior surface of said one of the walls, wherein the base portion extends from the interior surface of said one of the walls, wherein the stepped portion extends from the base portion and projects outward from the interior surface of said one of the walls, wherein the pressing portion extends from the stepped portion substantially parallel to the interior surface of said one of the walls, and wherein the at least one retainer spring is elastically deformable and configured to be pressed toward the interior surface of said one of the walls during assembly without permanently deforming and to return to a non-flexed position when the plate reaches the assembled position to obstruct rotation of the plate in a second rotational direction opposite the first rotational direction out of the assembled position.

12. The junction box of claim 11 , wherein each of the at least two stopper walls has a first end and a second end, wherein the first end is tapered, and wherein each of the at least two retaining flanges are positioned on the second ends of the at least two stopper walls.

13. The junction box of claim 11 , wherein the mating area is shaped like a rectangle having four corners and four edges, and each of the at least two stopper walls extends from one of the corners along one of the edges.

14. The junction box of claim 11 , wherein the perimeter of the mating area has more than one edge and each of the at least two stopper walls extends a short length along an edge of the mating area with respect to the full length of the edge.

15. The junction box of claim 11 , wherein the perimeter of the mating area has at least one corner, wherein each of the at least two stopper walls has a first end and a second end, the first end being nearer to one of the corners than the second end to any of the corners, and wherein each of the at least two retaining flanges is positioned on the first end of the at least two stopper walls.

16. The junction box of claim 11 , wherein the mating area further comprises rests upon which the plate mates during assembly into the assembled position.

17. A method of assembling a junction box and a sensor assembly of a probe wherein the sensor assembly comprises a housing and a plate, wherein the junction box comprises a plurality of walls, one of the walls comprising a mating area on an interior surface of said one of the walls, at least two stopper walls each projecting from the interior surface of said one of the walls, at least two retaining flanges each projecting from one of the stopper walls and extending over the mating area at a distance offset from the interior surface of said one of the walls, and at least one retainer spring comprising an interior edge proximate the perimeter of the mating area and projecting from the interior surface of said one of the walls, wherein said one of the walls comprises an opening, and wherein the method comprises:

inserting the sensor assembly through the opening;

pressing the plate onto the at least one retainer spring and elastically deforming the at least one retainer spring;

rotating the sensor assembly in a first rotational direction until the at least one retainer spring is unobstructed by the plate and returned to a non-deformed position where the retainer spring obstructs rotation of the plate in a second rotation direction opposite the first rotational direction.

18. The method of claim 17 , wherein the sensor assembly is rotated in the first rotational direction until the plate is obstructed by the at least two stopper walls from rotating further in the first rotational direction.

19. The method of claim 17 , wherein the sensor assembly is rotated in the first rotational direction until the plate is between the at least two retaining flanges and the interior surface of said one of the walls.

20. The method of claim 17 , wherein the step of inserting the sensor assembly through the opening comprises orienting the sensor assembly with the plate oriented to an insertion position rotationally offset from the mating area, wherein the sensor plate avoids contacting the at least two stopper walls and the at least two retaining flanges during insertion.