Device for sealing V-belt and pulley in plate jarring devices

Claim 1

In combination in a jarring device having a bottom plate adapted to be jarred and having a forward moving advancing direction, an unbalance oscillation generator with a generator housing therefor having a shaft and being firmly connected to said bottom plate, an applied load, a drive motor having a motor shaft and mounted on said applied load, a belt drive drivingly connecting said drive motor to said unbalance oscillation generator, said drive motor in the bottom plate forward moving advancing direction of said jarring device being offset relative to said oscillation generator and being arranged on the applied load, means for cushioning said applied load relative to said bottom plate, a protective housing surrounding said belt drive and being closed on all sides with the exception of passage means for the shafts of said drive motor and said oscillation generator respectively, said protective housing being firmly connected to at least said motor, said motor shaft extending in a dustproof manner through said passage means provided therefore in said protective housing, sealing means stationarily interposed between said motor shaft and protective housing, said passage means for said shaft of said unbalance generator having a radial oversize with regard to said last mentioned shaft which oversize corresponds to at least the oscillation amplitude between said applied load and said bottom plate, sealing ring means surrounding said shaft of said unbalance oscillation generator outside the pertaining passage means in said protective housing for effecting a seal between said protective housing and said generator housing for said unbalance oscillation generator, said sealing ring means being firmly connected to one of said housings, said sealing ring means having one end face facing away from said one of said housings and in each phase of the relative oscillatory movement of said unbalance oscillation generator engaging a plane annular sealing surface substantially vertical with regard to said shaft of said unbalance oscillation generator between said last mentioned shaft and one of said housings.