Abstract: A grass-bagging apparatus for use with a lawn mower. The apparatus includes a chute with a disposable bag disposed therearound. An attaching frame is used to fasten the chute to the mower and retain the bag thereon. Grass and other cuttings discharged from the lawn mower are directed in the bag through the chute. After the bag is filled, the chute may be removed from the bag while leaving the cuttings in the bag. The filled bag may then be closed for disposal and a new bag positioned on the chute. A protective screen may be provided between the plastic bag and the operator in the event that objects discharged from the mower penetrate the material of the bag.

Abstract: A Hall-effect device and a magnet are mounted on respective resonant bridge supports in magnetic field relationship whereby movement of either the magnet or the Hall-effect device produces a change in the field strength at the Hall-effect device. The two support structures with their mounted components exhibit different natural resonant frequencies whereby stimuli in either of two different ranges causes one or both of the magnet or Hall-effect device to move at their resonant frequency producing a signal. Signal processing circuitry disregards D.C. signals from the Hall-effect device and responds only to A.C. signals, indicative of shocks in the 1000 to 2000 Hertz range or movement of the detector with components in less than the 150 Hertz range. Three different bridge structures are disclosed, one with separate bridges, one employing common support columns and one which is integrally molded.