The lengths of the links comply with the condition: B͞C=0.34B͞A. Crank 3, turning about fixed axis B, is connected by turning pair A to slider 4 which slides along axis C͞A. Slider 4 is connected by turning pair A to slider 5 which moves along extension a of link 1. Link 1 slides in fixed guides b whose axis is perpendicular to a line passing through axes B and C. Extension a makes an angle of 90° with the axis of guides b. When link 2 oscillates at uniform velocity through angles ϕ on both sides of line B͞C, link 1 reciprocates with approximately uniform velocity.
$1005$LG,6L$