Patent ID: 7059423
Filing Date: 2006-06-13
Classification: B25D

Abstract:
1. A jackhammer system, comprising: a housing; a chisel movably positioned within a lower neck of said housing; a pair of support brackets pivotally attached to said housing; a pair of flywheels rotatably attached to said support brackets; at least one motor mechanically connected to said flywheels for rotating said flywheels, wherein said flywheels each have an opposite rotation from one another; a ram slidably positioned within a guide channel of a guide member, wherein said ram is positionable between and engageable by said flywheels to engage said chisel; a plurality of elastic members attached to said ram; at least one actuator connected to said support brackets for selectively positioning a perimeter edge of said flywheels in engagement with an outer surface of said ram; at least one sensor within said housing for determining a position of said ram; a control unit in communication with said at least one actuator, said at least one sensor and said motors; an engaging plate movably supported by a plurality of compression springs within a lower portion of said housing that receives the downwardly impact of said ram when driving said chisel downwardly and when said ram extends into a lower position, wherein said engaging plate has a central aperture for allowing said chisel to freely pass through and wherein said central aperture has a size smaller than a main shaft portion of said ram; and a plurality of guide posts for slidably supporting said engaging plate.