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A power driven hammer drill has a tool impacting mechanism, a wobble unit for reciprocating the tool striking mechanism and having a drum member which can be releasably coupled with an intermediate shaft driven by a motor, wherein a switching device is provided outside of a hammer drill housing and

A power driven hammer drill has a tool impacting mechanism, a wobble unit for reciprocating the tool striking mechanism and having a drum member which can be releasably coupled with an intermediate shaft driven by a motor, wherein a switching device is provided outside of a hammer drill housing and arranged so as to disengage a coupling element of the intermediate shaft out of a coupling element of the drum member of the wobble unit against the action of a spring.

대표청구항 ▼

A power driven hammer drill, comprising a housing having an axis; a tool striking means arranged to reciprocate in said housing; drive means including a wobble unit with a limitably axially displaceable drum member and a transmitting member reciprocating said tool striking means, a drive motor forme

A power driven hammer drill, comprising a housing having an axis; a tool striking means arranged to reciprocate in said housing; drive means including a wobble unit with a limitably axially displaceable drum member and a transmitting member reciprocating said tool striking means, a drive motor formed as an electric motor with a pinion, an intermediate shaft having a passage and rotatable by said drive motor, a driving gear arranged on said intermediate shaft in non-rotatable and axially displaceable manner relative thereto and engageable with said pinion of said electric motor, means for releasably coupling said intermediate shaft with said drum member of said wobble unit and including a first coupling element provided on said drum member and a second coupling element provided on said intermediate shaft and positively engageable with said first coupling element of said drum member, a bearing which transmits axial forces, supports said intermediate shaft and has an inner ring, spring means arranged to act so as to bring said second coupling element of said intermediate shaft into interengagement with said first coupling element of said drum member, said spring means including a spring element accommodated in said passage of said intermediate shaft and prestressing the latter with an axial abutment against said drum member in engaged condition, whereas said drum member axially abuts said driving gear, and said driving gear abuts against said inner ring of said bearing; and switch means located outside of said housing and arranged so as to disengage said second coupling element of said intermediate shaft out of said first coupling element of said drum member against the action of said spring means.