case, has a preliminary compression and “hysteresis” (AF); thus, its characteristic for the mechanism of bilateral action has the form where rigidity c(5) for nonlinear characteristics depends on the deformation 6. Four types of springs are used in the docking device: 1) screw cylindrical; 2) plate-like; 3) flat spiral; 4) torsional. It is expedient for structures using screw springs or plate-like springs to operate only on compression, in this case, eliminating complete failure of the mechanism due to breakdowns of the springs. This type of construction is used, for example, in the spring mechanisms of the lateral shock absorbers of the Soyuz- Salyut docking mechanism, providing a two-stage characteristic (Figure 6.4). Figure 6.4. Spring mechanism of staged action (a) and its characteristic (b). 1. rod; 2. screw spring; 3. support washer; 4. set of plate-like springs; 5. casing. A. compression; B. expansion.
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