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The authors discuss general schemes of air percussion machines equipped with ring-shape elastic valves, substantiate parameters of an elastic valve calculation model, derive relations for the valve sizes, material characteristics and actuation pressure, as well as present results of experimental estimate for the behavior of a material the valve is made of.

The process of actuation is considered for the inertial element in the improved air-distributing system of pneumatic puncher whose dimensionless parameters are determined.

All of us were brought here by those common feelings that arouses in every cultured person the name of our great compatriot I.P. Pavlov - boundless gratitude for the great services that Pavlov rendered to humanity with his brilliant research, the deepest respect for him as a tireless teacher and leader in scientific activity of the overwhelming majority of our physiologists and clinicians and admiration for his enormous talent and inexhaustible energy. Pavlov is a figure of exceptional strength not only in the history of ours, but also in world science.

The influence exerted by the basic parameters of an annular tool-equipped device with the impact and traction drives on the velocity of cyclic driving of boreholes in soil is considered.