The lengths of the links comply with the conditions: A͞B=B͞C and A͞D=C͞D. When suspension d is pulled upward, scoops 5 and 6 close over loose material b and load b is carried to the required location. To dump the bucket it is set down on the stationary material a. Scoops 5 and 6 rest on material a and point B descends so that the configuration of rhomboid linkage ABCD is changed, scoops 5 and 6 are opened releasing load b.
$826$LW,MH$