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Compound Lever

From DT Online

BenchShearCompoundLever.jpg


Description

Levers of any of the 3 Classes may be combined such that the load of one lever is the effort applied to another.


This can be done to increase Mechanical Advantage (especially where operating space is restricted) or to increase movement as with a piano key mechanism for example.


Features and Uses
Fingernail Clippers.jpg

Common examples of Compound Lever applications include: nail clippers, bolt cutters, bench shears, 'aviation' type tinsnips, bass drum pedal and mechanical typewriter mechanisms.

Animations
Bench Shears - a 4-Bar Linkage is used. Hand force is applied to one crank. The upper tool blade is fixed to the other crank.
Foot Operated Shearing Machine - the blue slider carrying the red upper cutter is driven by a 6-bar mechanism. The sheet is clamped before sheared by a slider crank mechanism of brown eccentric shaft. The runway of the green slider is on the blue slider. The orange lower cutter is fixed to the machine base. The red upper cutter has an inclined cutting edge to cut with reduced force using a skewed slicing action.
DT Online Buyers' Guide
  • Simple Frames and Linkages can be explored using Construction Kits such as those listed below.


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Viga Wooden Construction Set (53-Piece) Straws and Connectors, 705/pkg - build complex structures! Educational Toys Construction Engineering Blocks By ETI Toys for Boys and Girls 85 Piece Set for Building Endless Combinations! Great for Learning & Having Fun Build Your Imagination Today! K'Nex Education Kid Group Set Engino Education Design and Technology Master Construction Set LEGO Education DUPLO Tech Machines Set LEGO® Education WeDo 2.0 Core Set Meccano Set 1 Easy Construction Box Meccano 25 Model Set Fischertechnik Universal 3 Building Kit
Viga Wooden Construction Set (53-Piece) Straws and Connectors, 705/pkg - build complex structures! Construction Engineering Blocks 85 Piece Set K'Nex Education Kid Group Set Engino Education D&T Construction Set LEGO Education DUPLO Tech Machines Set LEGO® Education WeDo 2.0 Core Set Meccano Set 1 Easy Construction Box Meccano 25 Model Set Fischertechnik Universal 3 Building Kit