37 Thermal expansion
Use thermal expansion (or contraction) of materials.
• Fit a tight joint together by cooling the inner part to contract, heating the outer part to expand, putting the joint together, and returning to equilibrium.
If thermal expansion is being used, use multiple materials with different coefficients of thermal expansion.
• The basic leaf spring thermostat: (2 metals with different coefficients of expansion are linked so that it bends one way when warmer than nominal and the opposite way when cooler.)
• Fit a tight joint together by cooling the inner part to contract, heating the outer part to expand, putting the joint together, and returning to equilibrium.
If thermal expansion is being used, use multiple materials with different coefficients of thermal expansion.
• The basic leaf spring thermostat: (2 metals with different coefficients of expansion are linked so that it bends one way when warmer than nominal and the opposite way when cooler.)
Is this principle frequently used?
This principle is rarely used with 60 instances in the matrix.This principle is proposed to solve the following contradictions:
Click on a contradiction to explore it
1/10 1/11 1/39 2/30 3/29 4/13 6/11 7/10 7/11 8/10 8/39 10/1 10/6 10/7 10/8 10/20 10/21 10/25 10/29 10/32 10/37 10/39 11/1 11/6 11/19 11/23 11/25 11/30 11/37 11/39 12/10 13/4 14/30 19/21 20/10 20/30 21/3 21/19 22/23 23/11 25/1 25/10 25/11 29/3 30/7 30/11 30/14 30/20 32/11 35/12 35/36 35/39 36/35 36/37 37/11 37/36 39/1 39/8 39/11 39/35
The colour indicates the ranking of the proposed principle to solve the contradiction:
1st,
2nd,
3rd,
4th.
This ranking reflects the frequency of occurrence of the principle in the analysed patents for this type of contradiction.
When a principle appears in first position, it means that it is statistically the most used in the patents studied for this type of problem.