Abstract A drill attachment capable of holding a portable electric drill so that a drilling operation can be performed perpendicular to an oblique surface of a workpiece. The drill attachment includes a tubular guide member closed at one end which is releasably secured to the body of a drill in parallel relation to the drill bit. To facilitate up and down movement of the drill and tubular member, a plunger is positioned in the tubular member and projects outwardly from the free end thereof. A biasing spring is positioned in the tubular member between its closed end and the inner end of the plunger to further enhance this up and down movement. A base member is provided to engage a portion of the oblique surface of the workpiece during the drilling operation. The free end of the plunger is pivotally connected to the base member to permit the angular adjustment of the base to coincide with the angle of the oblique surface. Once the desired adjusted position is obtained, suitable releasable means are provided to hold the plunger and base member in place.
A drill attachment for guiding a drill having a drill bit while performing a drilling operation in a workpiece comprising: a tubular guide member having a closed and an open end; means to secure the guide member to the body of the drill in parallel relation to the drill bit; a plunger positioned in the tubular member and projecting outwardly from the open end thereof; the plunger being formed with a longitudinal guide slot, the tubular guide member being provided with a hole adjacent its open end, and a thumb screw extending through the hole and into the longitudinal guide slot for preventing relative rotation between the plunger and guide member; a biasing spring positioned in the tubular member between its closed end and the inner end of the plunger; a base member engageable with the surface of the workpiece during the drillling operation, the central portion of the member being open to permit the drill bit to pass therethrough; interengaging means on the base member and at the outer end of the plunger for pivotally connecting the base member and plunger together, the interengaging means permitting the position of the base to be angularly adjusted with respect to the plunger; and releasable locking means coacting with the interengaging means to hold the base member in the desired position of adjustment.
Claim 2
Dependent Claim
221 words
A drill attachment for guiding a drill having a drill bit while performing a drilling operation in a workpiece comprising: a tubular guide member having a closed and an open end; means to secure the guide member to the body of the drill in parallel relation to the drill bit; a plunger positioned in the tubular member and projecting outwardly from the open end thereof; the plunger being formed with a longitudinal guide slot, the tubular guide member being provided with a hole adjacent its open end, and a thumb screw extending through the hole and into the longitudinal guide slot for preventing relative rotation between the plunger and guide member; a biasing spring positioned in the tubular member between its closed end and the inner end of the plunger; a base member engageable with the surface of the workpiece during the drillling operation, the central portion of the member being open to permit the drill bit to pass therethrough; interengaging means on the base member and at the outer end of the plunger for pivotally connecting the base member and plunger together, the interengaging means permitting the position of the base to be angularly adjusted with respect to the plunger; and releasable locking means coacting with the interengaging means to hold the base member in the desired position of adjustment.