Stop system for a tool for heating by direct contact

2:

• The stop system according to claim 1,
• wherein, the extension element is a straight cam, a coupling of said at least one follower to the straight cam is achieved by direct contact between a first peripheral surface of said at least one follower and a planar coupling surface of the straight cam, which is inclined at a non-zero angle A relative to the direction of the longitudinal axis X of the straight cam, such that the first peripheral surface of said at least one follower is made to follow the planar coupling surface of the straight cam, causing a translational movement along the longitudinal axis X of said at least one follower combined with a rotational movement of said at least one follower about an axis of rotation Y perpendicular to the longitudinal axis X when said at least one follower goes from the rest position to the working position.

3:

• The stop system according to claim 1,
• wherein the extension element is a straight cam, a second peripheral surface of said at least one follower is configured to bear against the inner surface of the wall of the tank through which the straight cam passes, in the working position.

4:

• The stop system according to claim 1,
• wherein the extension element is a straight cam, said at least one follower comprises a rotating shaft of axis Y mounted in a cavity in a cylindrical support of the longitudinal axis X, the cylindrical support being capable of moving axially along the longitudinal axis X relative to the straight cam in order to convert the translational movement along the longitudinal axis X of said at least one follower into the straight or quasi-straight movement of at least one point of said at least one follower.

5:

• The stop system according to claim 1,
• wherein the deployable member comprises ‘n’ followers, where n is an increasing function of the size of the opening.

6:

• An assembly for heating by direct contact for a machine for plastic welding of a component to an opening in a wall of a motor vehicle tank, the assembly comprising a tool for heating by direct contact and a stop system according to claim 1.

7:

• The assembly for heating according to claim 6, wherein the tool for heating by direct contact comprises a melt overflow limiter.

8:

• The assembly for heating according to claim 7, wherein the melt overflow limiter is secured to the tool for heating by direct contact.

9:

• A machine for plastic welding of a component to an opening in a wall of a motor vehicle tank, the machine comprising a heating assembly according to claim 6 and a tool for attaching a component by plastic welding.

11:

• The engagement method according to claim 10, wherein the bringing the tool for heating by direct contact into direct contact with an outer surface of the wall of the tank that is contiguous with the opening is carried out before the placing said at least one follower in the working position.

12:

• A method for heating a wall of a motor vehicle tank by direct contact using a tool for heating by direct contact, the method comprising
• performing the engagement method according to claim 10, and
• heating the outer surface of the wall of the tank that is contiguous with the opening by direct contact using the tool for heating by direct contact.