Angle indicating attachment for drills

• US 4,227,839 A
• Filed: 11/29/1978
• Issued: 10/14/1980
• Est. Priority Date: 11/29/1978
• Status: Expired due to Term

• Current Assignee: Ceil L. Conway
• Original Assignee: Ceil L. Conway
• Inventors: Conway, Ceil L.
• Primary Examiner(s): Hinson, Harrison L.
• Application Number:
  US05/964,786
• Time in Patent Office: 685 Days
• Field of Search: 408/16, 408/89, 408/116, 408/112, 408/113, 408/114, 408/115, 408/110, 408/241
• US Class Current: 408/16
• CPC Class Codes: B25H 1/0092 by optical means
• CPC Class Codes: Y10T 408/21 with signal, indicator, illuminator or optical means
• CPC Class Codes: Y10T 408/5653 with means to bias Tool away from work
• CPC Class Codes: Y10T 408/96 Miscellaneous

Abstract

A device to be attached to drills, particularly power drills, for indicating the angular relation of the rotational axis of the drill to a surface being drilled and permitting the drill operator to guide the drill in accurately pointing the axis of the drill bit at any angle up to about 45° out of square, or plumb to about 45° out of plumb, or any combination thereof. Furthermore, the device can be utilized as an angle drilling gauge independently of its attachment to a drill in order to determine the angle between two planar surfaces joined at an angle from square to about 45° right or 45° left out of square.

Claims

1. A device having angle indicating means for removable attachment to a hand held drilling tool comprising, in combination, an elongated, symmetric body being rigidly and removably held above said drilling tool along its longitudinal extent by attaching means, visual vertical angle indicating means and visual horizontal angle indicating means, said horizontal indicating means including a pair of parallel forwardly extending angle gauge pivot rods held by said body in spaced relationship for contacting a surface for drilling by said drilling tool, said rods being adapted to move freely in the longitudinal direction and to orient indicating means attached to said body for indicating the horizontal angular relation of said drilling tool to said surface, said indicating means comprises an angle gauge pivotable, in response to relative moving displacement of said rods, about a pivot axis longitudinally slidable in the plane of symmetry of said body, said indicating means further including an angle indicator fixed in angular position with respect to the longitudinal extent of said body for visual observation of the angle of pivoting of said angle gauge about said pivot axis wherein said horizontal and vertical angle indicating means permit continued visual observation during use of said drilling tool in drilling into a flat surface.

2. The device of claim 1 wherein a pivot pin is centered on said pivot axis and is attached to carrying means freely slidable on a carriage shaft, said pivot pin securing said angle indicator to said carrying means, and said angle indicator being further secured to said carrying means by an indicator rivet.

3. The device of claim 2 wherein each of said angle gauge pivot rods is connected by a link means to said angle gauge, each of said link means being biased by elastic compression means acting longitudinally along said rod between said link means and said body, the link means being attached to the angle gauge at points equally spaced from the plane of symmetry of said body.

4. The device of claim 3 wherein said link means comprises a pair of angle gauge pivot rod clamps respectively attached to said angle gauge pivot rods, a pair of pivot rod rivets slidably passing respectively through a pair of slots in said angle gauge and respectively passing through a pair of bushings attached to said angle gauge pivot rod clamps for rotation within said bushings and for effecting pivotal motion of said angle gauge in response to relative sliding motion of said angle gauge pivot rods, said elastic compression means comprising a pair of return springs respectively surrounding said angle gauge pivot rods between said respective clamps and said body.

5. The device of claim 4 wherein said body includes a longitudinal mounting slot and said attachment means includes at least one threaded adjusting bolt for passing through said mounting slot to attach said body to a compatibly threaded recess in said drilling tool, and said vertical angle indicating means includes a protractor and monovial level indicator held by magnetic mounting means to a magnetic mounting plate countersunk into said body and secured thereto.

6. A measuring device for determining the angle between two planar surfaces comprising an elongated body, a pair of parallel angle gauge pivot rods in parallel spaced relationship passing slidably through said body, an angle gauge pivotably mounted on carrying means slidable longitudinally along said body, and link means for pivoting said angle gauge in response to relative linear displacement of said angle gauge pivot rods.

7. The device of claim 6 wherein said carrying means comprises a carriage slidably mounted on a carriage shaft, said angle gauge is a semicircular rigid planar disk having radial slots diametrically opposed from said pivot axis and passing over said angle gauge pivot rods, each of said pivot rods having a clamp rigidly attached thereto, said clamp having rotatably fitting therein a rivet extending through said slot for moving said angle gauge in response to linear extension of said pivot rod and thereby measuring the angular orientation of one of said planar surfaces in fixed relationship to said body with respect to the other of said planar surfaces in contact with said pivot rods.

8. A method of using the device of claim 7 comprising fixing the orientation of said body with respect to the first of said planar surfaces, sliding said body in the direction of said second planar surface, extending said pivot rods rearwardly by contact of said rods with said second planar surface, and observing the degree of rotation of said angle gauge in response to said rearward extension of the pivot rods.

9. A device having angle indicating means for removable attachment to a hand held drilling tool comprising, in combination, visual vertical angle indicating means and visual horizontal angle indicating means, said horizontal indicating means including a pair of parallel forwardly extending angle gauge pivot rods held in spaced relationship for contacting a surface for drilling by said drilling tool, said rods being adapted to move freely along the longitudinal extent of said drilling tool and to orient indicating means for indicating the horizontal angular relation of said drilling tool to said surface, said indicating means comprising an angle gauge pivotable, in response to relative linear displacement of said rods, said rods being pivotably connected with said indicating means wherein said horizontal and vertical angle indicating means permit continued visual observation during use of said drilling tool in drilling into a surface.

10. The device of claim 9 wherein said vertical angle indicating means includes a protractor and monovial level indicator held by magnetic mounting means to a magnetic mounting plate.