System for securing a casing and a cover of a housing element

1. A housing element for food applications comprising:

a casing made of metallic material; and

a cover made of composite material and having a bottom surface closed or provided with a through-hole,

wherein said housing element comprises a system for securing the cover on the casing comprising at least two steps which are formed on the cover and which engage with interference inside at least two corresponding grooves formed on the casing;

wherein the casing is made of stainless steel;

wherein the interference between the steps of the cover and the corresponding grooves of the casing occurs between the height in the axial direction of the steps and the height in the axial direction of the grooves, the interference value ranging between −0.05 mm and +0.1 mm.

2. The housing element of claim 1 , wherein the steps and the corresponding grooves are exactly four in number.

3. A housing element for food applications comprising:

a casing made of metallic material; and

a cover made of composite material and having a bottom surface closed or provided with a through-hole,

wherein said housing element comprises a system for securing the cover on the casing comprising at least two steps which are formed on the cover and which engage with interference inside at least two corresponding grooves formed on the casing;

wherein the casing is made of stainless steel;

wherein the system for securing the cover on the casing is realized so that a radially inner surface of the groove is in contact with a corresponding radially inner surface of the step;

wherein the securing of the cover and casing is also achieved by rotating the cover about an axis (X) of symmetry thereof until the step comes into contact by means of a side surface thereof with a corresponding side surface of the groove;

wherein the groove is T-shaped consisting of a core and two wings symmetrical with respect to the core.

4. The housing element of claim 3 , wherein the securing is also achieved by rotating the cover about its axis (X) of symmetry in one of the two possible directions of rotation so that the step, depending on the direction of rotation imparted to the cover, engages with one of the two wings.

5. The housing element of claim 4 , wherein the dimension of a connecting radius (R) of the core does not exceed 50% of the height (H) of the core.

6. The housing element of claim 5 , wherein the dimension of the connecting radius (R) of the core is between 0.5 mm and 1 mm.

7. A housing element comprising:

a casing made of metallic material and comprising a plurality of grooves; and

a cover made of composite material and having a bottom surface having a plurality of steps that is equal in number with the plurality of grooves, each respective step of the plurality of steps configured to engage with interference inside a respective groove of the plurality of grooves;

wherein each groove of the plurality of grooves is T-shaped consisting of a core and two wings symmetrical with respect to the core.

8. The housing element of claim 7 , wherein the bottom surface is either closed or provided with a through-hole.

9. The housing element of claim 7 , wherein securing the housing element is also achieved by rotating the cover about its axis of symmetry in either direction of rotation so that each respective step, depending on the direction of rotation imparted to the cover, engages with one of the two wings of the respective groove.

10. A casing made of metallic material and comprising:

a plurality of grooves configured to receive a plurality of steps of a cover in order to secure the cover to the casing, wherein each groove of the plurality of grooves is T-shaped consisting of a core and two wings symmetrical with respect to the core.

11. The casing of claim 10 , wherein the T-shaped grooves are configured to receiving cover steps rotationally about its axis of symmetry in either direction of rotation so that each respective step, depending on the direction of rotation imparted to the cover, engages with one of the two wings of the respective groove.