Manually guided, motor driven tamping devices

Claim 1

A MANUALLY GUIDED, MOTOR DRIVEN TAMPING DEVICE FOR COMPACTING EARTH, CONCRETE AND THE LIKE, SAID DEVICE COMPRISING A MOTOR, A GUIDED CYLINDER DEFINING A HOUSING, SAID MOTOR BEING SUPPORTED UPON SAID HOUSING, A GEAR TRANSMISSION AND A CRANK DISPOSED IN SAID HOUSING AND OPERATIVELY CONNECTED TO SAID MOTOR, A RECIPROCATING SYSTEM COMPRISING A GUIDING CYLINDER OPEN AT THE TOP AND SLIDINGLY RECEIVING SAID GUIDED CYLINDER AND A CONNECTING ROD HAVING ONE END OF LINKED TO SAID CRANK AND HAVING ITS OTHER END PIVOTALLY CONNECTED TO SAID GUIDING CYLINDER BY MEANS OF A WRIST PIN, A PLURALITY OF SLEEVES ARRANGED CIRCUMFERENTIALLY AROUND THE LOWER END OF SAID GUIDING CYLINDER, A TAMPING FOOT DISPOSED BELOW SAID GUIDING CYLINDER AND HAVING A PLURALITY OF GUIDE PINS EXTENDING UPWARDLY THEREFROM, ONE THROUGH EACH OF SAID SLEEVES FOR SLIDING MOVEMENT THEREIN, AND BIASING SPRINGS ASSOCIATED IN PAIRS WITH SAID GUIDE PINS, ONE ABOVE AND ONE BELOW EACH SAID SLEEVE, EACH SPRING OF A PAIR HAVING ONE END BIASED AGAINT ONE SAID SLEEVE, THE OTHER ENDS OF THE SPRING ABOVE SAID SLEEVES BEING BIASED AGAINST THE UPPER ENDS OF SAID GUIDE PINS, AND THE OTHER ENDS OF SAID SPRINGS BELOW SAID SLEEVES BEING BIASED AGAINST SAID TAMPING FOOT.