Patent ID: 6874585

Claim:
A power drill capable of outputting a torque in a drilling mode or a torque and an impact force in a hammer mode comprising: a housing having a distal end and a proximal end; a rotary motor in the housing; a spindle having a front portion and a rear portion and extending substantially along the longitudinal axis of the housing, wherein a collar on the front portion of the spindle serves as a stopper with a front face and a rear face; a retaining member located at least in part external to the distal end of the housing and capable of retaining externally a cutting element, where the retaining member is secured to the spindle to be driven therewith and is supported on the front face of the stopper; a rear bearing mounted on the rear portion of the spindle; a gearbox mounted within the housing; a transmission assembly accommodated within the gearbox for coupling the rotary motor with the spindle so as to transmit the rotation of the rotary motor to the spindle; a fixed gear connected to the gearbox and a movable gear fixed to the spindle, wherein the fixed gear and the movable gear have opposing peripheral teeth which are disengaged in the drilling mode so that the spindle is driven rotationally by the rotary motor to cause the torque force to be outputted to the retaining member and engaged in the hammer mode so that the spindle is driven rotationally and reciprocatively to cause the torque and impact force to be outputted to the retaining member; an adjustment member mounted on a front portion of the spindle for exteriorly adjusting the power drill between the drilling mode and the hammer mode, the adjustment member comprising a rotary adjustment cover, a sleeve having a front end and a rear end, wherein the sleeve is rotatably mounted on the front portion of the spindle, wherein the rear end of the sleeve is provided with a first engaging portion, an adjustment fork rotatably coupling the rotary adjustment cover with the sleeve and a stroke adjustment member having a front end and a rear end, wherein the stroke adjustment member is mounted on the spindle between the movable gear and the rear end of the sleeve, the stroke adjustment member being provided with a second engaging portion, wherein from the drilling mode the rotary adjustment cover is rotated so that the first engaging portion is aligned axially with the second engaging portion wherefrom the sleeve is pressable rearwardly so that the first engaging portion engages the second engaging portion and the opposing peripheral teeth of the fixed gear and the moveable gear engage into the hammer mode; and a plane bearing coaxially mounted on the spindle between the front end of the sleeve and the rear face of the stopper, the plane bearing comprising: one or more rolling elements and a substantially annular retainer for retaining the one or more rolling elements having a first axial end and a second axial end, wherein the one or more rolling elements extend axially beyond the first axial end of the retainer.