Drill scope
OwnerKeith D. Stapleyinventor
Life of this patent
Estimating the term…
Abstract
A drill scope comprising a calibrated protractor that can be read directly in terms of angle of tilt of the drill bit and a pivoting spirit level support means with tilt angle marker and bull's-eye bubble level that can be pivoted to a selected angle of tilt and then held in that position during use of the drill. In this manner, when the hand held drill is held such that the bubble reads level, the angle of tilt or inclination of the resulting hole can be readily maintained within one degree. The drill scope can be a U-shaped arm with level that swings over the entire drill housing, a circularly curved surface integrally mounted in the drill housing with a sliding element that holds the level or a calibrated protractor disc with radial support arm and level that attaches to the conventional side handle hole of the drill.
Claims4
In a hand held drill the specific improvement comprising:
- (a) a protractor means attached to said drill wherein said protractor means is a circular calibrated surface on the top back side of said drill and wherein said protractor means is calibrated in degree of tilt such as to correspond to the angle of tilt of the drill bit;
- (b) an adjustable indexing means operably engaged to said drill and protractor means such as to be movable through and operative range of angles and be selectively held at one of said angles and wherein said adjustable indexing means is a sliding element operatively engaged to said circular calibrated surface such as to slide over said circular surface and align a marker on said adjustable indexing means with said calibrations of said circular surface such as to indicate which angle of tilt is selected and wherein said adjustable indexing means is further adapted to hold a bubble spirit level such that said bubble reads level when said drill bit is tilted at said selected angle;
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- (c) a bubble spirit level attached to said sliding element of said adjustable indexing means.
In a hand held drill the specific improvement comprising:
- (a) a protractor means attached to said drill wherein said protractor means is at least one circularly calibrated disc mounted to the side of said drill calibrated in degree of tilt such as to correspond to the angle of tilt of the drill bit;
- (b) an adjustable indexing means operably engaged to said drill and protractor means such as to be movable through an operative range of angles and be selectively held at one of said angles and wherein the index means cooperates with said calibration of said protractor means such as to indicate which angle of tilt is selected and wherein said adjustable indexing means is a U-shaped member that straddles the drill having both ends of said U-shaped member pivotally attached to said drill and at least one end pivotally centered at said circularly calibrated disc such that a marker on said end of said U-shaped member indexes the selected angle and wherein said adjustable indexing means is further adapted to hold a bubble spirit level such that said bubble level reads level when said drill bit is tilted at said selected angle;
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- (c) a bubble spirit level is attached to the U-shaped member of said adjustable indexing means midway through the curve.
In a hand held drill wherein said hand held drill comprises a housing with a side handle adapted to reversibly attach to the side of said drill housing by threading into and out of a threaded hole in the side of said drill thus forming a removable handle extending perpendicular to the longitudinal direction of the drill bit the specific improvement comprising:
- (a) a protractor means attached to said drill wherein said protractor means is calibrated in degree of tilt such as to correspond to the angle of tilt of the drill bit and wherein said protractor means is a circularly calibrated disc that threadably mounts to the side of said drill by threading into said hole for said removable handle;
- (b) an adjustable indexing means operably engaged to said drill and pivotally attached to said protractor means such as to rotate about the axis of said threaded hole and center of said circular calibration disc such as to align a marker on said adjustable indexing means with said calibrations on said disc such as to indicate which angle of tilt is selected and wherein said protractor means and said adjustable indexing means that rotate about the axis of said threaded hole for accepting said removable side handle are further adapted to threadably accept said removable side handle such that tightening of said handle selectively holds said adjustable indexing means and wherein said adjustable indexing means is further adapted to hold a bubble spirit level such that said bubble reads level when said drill bit is tilted at said selected angle;
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- (c) a bubble spirit level attached to said adjustable indexing means.
A hand drill angle of inclination attachment comprising:
- (a) a circularly calibrated protractor disc adapted to threadably mount into the side hole of a hand held drill originally intended for reversibly mounting a side handle perpendicular to the direction of drilling wherein said disc is calibrated in degree of tilt such as to correspond to the angle of tilt of the drill bit;
- (b) a support arm means pivotally engaged to said circularly calibrated protractor disc such as to rotate about the center axis of said disc and wherein said support arm means is equipped with a marker that pivotally aligns with said calibration of said protractor disc and indicates the selected angle of tilt of said drill bit when said drill bit is held such that a bubble level mounted to the unattached end of said support arm reads level and wherein the circularly calibrated protractor disc and support arm means are further adapted to threadably accept a removable side handle such that tightening of said handle selectively holds said disc and support means at the selected angle of tilt as indicated by said marker and calibration alignment;
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- (c) a bubble spirit level mounted on said support arm such that it swings through a range of angles of tilt as measured by said marker and calibration alignment.
Dependencies are inferred from the claim text.