Crank 1 rotates about fixed axis A of the hammer housing. Connecting rod 7 is connected by turning pairs B and C to crank 1 and to slider 8 which is connected by springs 5 and 6 to striker 2. Two helical springs, 3 and 4, serve as the guides of striker 2. When crank 1 rotates, striker 2 of the hammer has a vibratory motion along axis x-x due to the action of springs 3, 4, 5 and 6.
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