7 Nested doll

Place one object inside another; place each object, in turn, inside the other.
  • Stackable garden chairs occupying the space of just one.
  • Measuring cups or spoons
  • Russian dolls
  • Portable audio system (microphone fits inside transmitter, which fits inside amplifier case)

Make one part pass through a cavity in the other.
  • Extending radio antenna
  • Extending pointer
  • Zoom lens
  • Seat belt retraction mechanism
  • Retractable aircraft landing gear stow inside the fuselage (also demonstrates Principle 15, Dynamism).
Principe 7 : Stackable garden chairs occupying the space of just one.


From TRIZ to ASIT

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Concrete examples

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Is this TRIZ principle frequently used?

This principle is rarely used with 36 instances in the matrix.

This principle is proposed to solve the following contradictions:

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3/7 3/22 4/6 4/12 4/39 5/7 6/4 6/22 6/39 7/3 7/5 7/14 7/22 7/26 8/12 9/7 12/4 12/8 14/7 22/3 22/4 22/6 22/7 22/8 22/17 22/25 22/26 22/36 26/22 34/35 34/38 35/5 35/34 39/4 39/6 39/33


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.

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