Filler neck with blocker device for diesel fuel tank

1. A filler neck for a diesel fuel tank, the filler neck comprising:

a filler neck housing;

a pair of control levers mounted pivotably on control lever pivots in the filler neck housing and configured such that on insertion of a nozzle of a diameter greater than a minimum diesel nozzle diameter into the filler neck, the control levers pivot in an outward direction, and do not pivot in an outward direction on insertion of a nozzle of a diameter less than the minimum diesel nozzle diameter;

a control spring attached respectively at both ends to the control levers and configured such that the pivoting in an outward direction by the control levers leads to a defined greater change in position for at least one control portion of the control spring;

a blocker lever mounted on a blocker lever pivot in the filler neck housing and pivotable between a blocking position which prevents insertion of a nozzle beyond the blocking lever and an unblocking position in which insertion of a nozzle beyond the blocker lever is allowed;

a blocker latch configured for movement between an immobilizing position and a non-immobilizing position, and which interacts with the blocker lever such that in the immobilizing position the blocker latch immobilizes the blocker lever in its blocking position, and in the non-immobilizing position does not immobilize the blocker lever in its blocking position whereby the blocker lever may pivot into the unblocking position;

a blocker latch spring configured to load the blocker latch towards the immobilizing position,

wherein the control spring is configured to permit movement of the blocker latch out of the immobilizing position into the non-immobilizing position by the defined greater change in position of at least the control portion of the control spring,

wherein the blocker lever if not immobilized in the blocking position is configured to pivot into the unblocking position through the insertion of a nozzle.

2. The filler neck of claim 1 , wherein inner sides of the control levers facing radially towards an inside of the filler neck, are curved inwardly.

3. The filler neck of claim 1 , wherein the control levers are offset relative to one another by 180 degrees around the filler neck.

4. The filler neck of claim 1 , wherein a minimum spacing of inner sides of the control levers facing radially towards an inside of the filler neck corresponds to the diameter of a petrol nozzle if no nozzle has been inserted into the filler neck.

5. The filler neck of claim 1 , wherein the control portion of the control spring is formed by a central, straight part.

6. The filler neck of claim 1 , wherein the control portion of the control spring is guided in a slot in the filler neck housing.

7. The filler neck of claim 6 , wherein the slot in the filler neck housing extends radially from the outside to an inward direction.

8. The filler neck of claim 1 , wherein the defined greater change in position of at least the control portion of the control spring is achieved by the ends of the control spring being pushed outwards by the control levers, and the control portion of the control spring being pushed inwards.

9. The filler neck of claim 1 , wherein the blocker lever, in the blocking position prevents insertion of a nozzle beyond the blocker lever by occupying a sufficient part of the filler neck diameter, and in the unblocking position allows insertion of a nozzle beyond the blocker lever by opening up a sufficient part of the filler neck diameter.

10. The filler neck of claim 1 , wherein the blocker lever comprises a contour with a notch and the blocker latch is located in its non-immobilizing position if a movable end of the blocker latch lies in the notch.

11. The filler neck of claim 10 , wherein the control portion of the control spring is pushed inwards on the defined greater change in position at least of the control portion of the control spring and the movable end of the blocker latch is thereby pushed into the notch in the blocker lever.

12. The filler neck of claim 1 , wherein the blocker lever comprises a contour with a notch and the blocker latch is located in its non-immobilizing position if a movable end of the blocker latch lies in the notch.

13. A filler neck for a diesel fuel tank, the filler neck comprising:

control levers mounted pivotably for movement between a first position on insertion of a nozzle of a diameter less than the minimum diesel nozzle diameter, to a second position upon insertion of a nozzle of a diameter greater than the minimum diesel nozzle diameter into the filler neck;

a blocker lever mounted pivotably between a blocking position which prevents insertion of a nozzle beyond the blocking lever and an unblocking position in which insertion of a nozzle beyond the blocker lever is allowed;

a blocker latch mounted for movement between an immobilizing position which immobilizes the blocker lever in its blocking position, and a non-immobilizing position which permits the blocker lever to move to the unblocking position; and

a control spring operatively attached respectively at both ends to the control levers and configured such that the second position of the control levers results in a defined greater change in position for a control portion of the control spring, and also configured to permit movement of the blocker latch out of the immobilizing position into the non-immobilizing position by the defined greater change in position of the control portion of the control spring,

wherein the blocker lever, if not immobilized in the blocking position, is configured to pivot into the unblocking position through the insertion of a nozzle.

14. The filler neck of claim 13 , further comprising a blocker latch spring configured to load the blocker latch towards the immobilizing position.

15. The filler neck of claim 13 , wherein a minimum spacing of inner sides of the control levers facing radially towards an inside of the filler neck corresponds to the diameter of a petrol nozzle if no nozzle has been inserted into the filler neck.

16. The filler neck of claim 13 , wherein the blocker lever, in the blocking position prevents insertion of a nozzle beyond the blocker lever by occupying a sufficient part of the filler neck diameter, and in the unblocking position allows insertion of a nozzle beyond the blocker lever by opening up a sufficient part of the filler neck diameter.

17. The filler neck of claim 13 , wherein the control levers are offset relative to one another by 180 degrees around the filler neck.