Tempering frame for thermal tempering of glass panes

1. Tempering frame for thermal tempering of glass panes, comprising a carrier frame and a support frame that is joined to the carrier frame via a plurality of connection elements and is arranged completely within the carrier frame,

wherein the support frame has an upper primary surface for placing a glass pane, a lower primary surface, a front edge that faces the glass pane, and a rear edge that faces the carrier frame,

wherein the support frame has recesses introduced in the rear edge, which are arranged between adjacent connection elements, and

wherein the recesses are machined in the rear edge of the support frame and extend through a thickness of the support frame defined between the upper and lower primary surfaces so that a width of the support frame varies between two adjacent connection elements.

2. The tempering frame according to claim 1 , wherein the recesses are arranged between at least 50% of the adjacent connection elements.

3. The tempering frame according to claim 2 , wherein the recesses are arranged between at least 90% of the adjacent connection elements.

4. The tempering frame according to claim 1 , wherein the recesses have a depth of at least 10% of a width of the support frame.

5. The tempering frame according to claim 4 , wherein the depth is from 20% to 50% of the width of the support frame.

6. The tempering frame according to claim 1 , wherein the recesses have a width of at least 50% of a distance between adjacent connection elements.

7. The tempering frame according to claim 6 , wherein the recesses have a width of at least 90% of the distance between adjacent connection elements.

8. The tempering frame according to claim 1 , wherein a width of the recesses decreases with increasing depth of the recesses and wherein the recesses have a curved outline.

9. The tempering frame according to claim 1 , wherein the support frame has a width of 10 mm to 100 mm.

10. The tempering frame according to claim 1 , wherein the support frame has a thickness of 1 mm to 10 mm.

11. The tempering frame according to claim 1 , wherein the connection elements have, in each case,

a first attachment section, which is connected to the support frame by an attachment screw,

a second attachment section, which is connected to the carrier frame by an adjusting screw, and

a connecting section extending between the first attachment section and the second attachment section.

12. The tempering frame according to claim 11 , wherein the first attachment section and the second attachment section are widened compared to the connecting section.

13. The tempering frame according to claim 11 , wherein the first attachment section and the connecting section have substantially the same width and the second attachment section is widened compared thereto.

14. The tempering frame according to claim 1 , wherein the support frame is composed of multiple subsections and wherein adjacent subsections are connected to the carrier frame by means of a common connection element.

15. The tempering frame according to claim 1 , wherein a distance between adjacent connection elements is from 5 mm to 100 mm.

16. Method for thermal tempering of glass panes, comprising:

(i) moving a tempering frame according to claim 1 , on whose support frame a heated glass pane is arranged, between a first blow box and a second blow box;

(ii) impinging on the glass pane a stream of gas by means of the two blow boxes such that the glass pane is cooled.

17. The method according to claim 16 , wherein the distance between the blow boxes in step (ii) is less than 90 mm.