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Pulley Block for Demonstration
J2121 demonstration block and tackle, J2122 student block and tackleUse:1st, specially feed the physical teaching in the middle school and natural general knowledge discipline in the elementary school when used in the classroom demonstration or the grouping experiment2nd, the J2121 demonstration block and tackle demonstrate the pulley tectonic for the teacher, with better mechanical and experimental efficiency3rd, the J2122 student block and tackle group "the mechanical efficiency" for the student and experimentStructure:1st, block and tackle wheel disk is made from ABS engineering plastic, to enhance the mechanical efficiency and the use effect; the wheel axle uses the copper nature. The frame and the knot skeleton are made from coal steel cold rolled plate, with superficial chrome-plating2nd, J2121 each group has a single pulley, 3pc string pulley block3rd, J2122 each group has a single pulley, 2pc string pulley block
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