Excavating – Ditch filler
Patent
1985-09-20
1986-12-02
Eickholt, E. H.
Excavating
Ditch filler
37103, 371175, 37DIG18, E02F 500
Patent
active
046254382
ABSTRACT:
An excavating bucket, for example a bucket of the type used on a backhoe, has a leading or digging edge along which is provided a row of individually pneumatically driven digging teeth. Power for the teeth is supplied through impact hammers which reciprocate the teeth at high speed and with great force, whereby the teeth may be advanced into a work surface and break it up for loading into the bucket with maximum speed and ease. As high speed reciprocation of the several teeth continues, their associated impact hammers are progressively, relatively slowly advanced bodily toward the work surface, so as to effect a steady and substantially continuous penetration of the surface, including cementitious surfaces and other very hard surfaces often encountered during excavation, demolition, and other heavy operations in which a backhoe is typically used. As progressive advancement of the hammer persists under pressure from pistons advanced against the hammers by air under pressure, arms on the hammers engage valves that control the flow of air under pressure to the hammers, thereby causing cessation of the operation of each hammer when it has been advanced a predetermined distance through the work. Further movement of the backhoe bucket into the work thereafter causes retraction of the hammers, once again permitting air under pressure to be supplied thereto, and also initiating a new cycle of advancement under the pressure of the pistons, for each of the several, individually powered units.
REFERENCES:
patent: 2228445 (1941-01-01), De Velbiss
patent: 3065557 (1962-11-01), Pewthers
patent: 3305953 (1967-02-01), Von Mehren et al.
patent: 3550960 (1970-12-01), Holder
patent: 3565182 (1971-02-01), Teasdale
patent: 3659654 (1972-05-01), Davies et al.
patent: 3677604 (1972-07-01), Leyrat
patent: 3828951 (1974-08-01), Fleming
patent: 3864852 (1975-02-01), Lochrie
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