Crankpin b of crank 1 is rigidly attached to disk d which has serration-type (triangular) teeth around its circumference. The throw of crank 1 can be varied within the limits from r_min=B͞b‘ to r_max=B͞b by turning disk d about axis A. Disk d can be locked in the required position by link 2 which has internal teeth e. Disk d is clamped by nut a.
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