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Hand skipping rope equipment is developed with braking trundles which can count. With the help of trundles people can move the machine to a right place. The right and left circle diameter are 2100mm. Distance of the two circles can be changed. Mechanical counter is installed on the handle . Turns can be moved to the left circle and the drive shaft by the counting handle. Meanwhile the counter begins to count. The shaft move turns from the chain to right circle. Four identical chain wheels are designed, the right and left circle can drive rope rotate at the same time. When the speed is 0. 5r/s, centrifugal force of rope is 12. 26N. When the acceleration was set with 3 valve the simulation shows the acting force of revolving axle is 64N, 11. 8N, 23N, which is similar with calculation.

This paper reports a technique for measuring the calibrating resistive input torque of a micro counter and gearbox assembly. The technique presented uses a hairspring (with a quantifiable output torque) to drive the input shaft to a mechanical counter and gearbox assembly in order to determine its resistive torque. The angular displacement of this spring, a parameter needed to compute the torque, is measured using a combination of a laser diode and a monolithic one-dimensional position sensitive device (PSD). This study includes the steps undertaken to develop it from a concept to functional prototype and interpretation of the results it yields. Tests show that in principle the use of a hairspring and PSD is a viable method of measuring micro-torque.

Human explorers of planetary surfaces would benefit greatly from a spacesuit design that facilitates locomotion. To aid in the development of such an extravehicular activity suit, a design effort incorporating the concept of mechanical counter pressure (MCP) was undertaken. Three-dimensional laser scanning of the human body was used to identify the main effects of knee flexion angle on the size and shape of the leg. This laser scanning quantified the changes in shape that must be supported by an MCP garment and the tension that must be developed to produce even MCP. Evaluation of a hybrid-MCP concept using inextensible materials demonstrated strong agreement between experimental data and a mathematical model with rigid cylinder geometry. Testing of a form-fitting garment on the right lower leg of a subject demonstrated successful pressure production. Further research is required to evaluate how evenly pressure can be distributed using the hybrid-MCP concept.

An integrating lightmeter consisting of three silicon photoelements in series directly connected to a low-inertia integrating motor with mechanical counter is described.

United States. National Aeronautics and Space Administration (OCT Space Technology Research Fellowship Grant NNX11AM62H)