Drill accessory

• US 5,595,250 A
• Filed: 01/25/1996
• Issued: 01/21/1997
• Est. Priority Date: 03/31/1995
• Status: Expired due to Fees

• Current Assignee: George C. Bourke
• Original Assignee: George C. Bourke
• Inventors: Bourke, George C.
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US08/591,692
• Time in Patent Office: 362 Days
• Field of Search: 173/29, 30/286, 30/295, 30/392, 30/500, 30/370, 30/376, 30/377, 144/1 F, 408/20, 408/21
• US Class Current: 173/29
• CPC Class Codes: B23D 49/162 Pad sawing devices
• CPC Class Codes: B23D 57/0076 Devices for converting any machine for sawing purposes
• CPC Class Codes: Y10T 408/31 Convertible cutting means

Abstract

The drill attachment is a cordless, electric or pneumatic drill device having three (3) flush cut features which enables user to saw in a reciprocating action. A compact metal enclosure has steel bevel gears together to generate perpetual motion onto an eccentric peg to drive arm to blade. The rotation of the drill enters the tool by the removable hexagonal shaft which can be inserted into the tool at three (3) different angles depending on the task. The small bevel gear meshes with a larger bevel hub gear having an eccentric peg that is inside an elongated slot of the blade drive armature. As the small bevel gear rotates, its speed is increased by ratios in the larger bevel hub gear; the rotation of the larger bevel hub gear is converted to a linear reciprocating motion which drives the blade.

Claims

1. A power tool attachment for converting rotary motion from a power tool into reciprocating motion of a saw comprising:

a housing, a first gear mounted in said housing and having a peg mounted eccentrically thereon, a blade connected to a blade drive arm, said blade drive arm reciprocable in said housing and having a slot therein, said peg received in said slot, a pair of second bevel gears mounted in said housing orthogonally with respect to each other and each being engaged with said first bevel gear, said second bevel gears each having a recess therein, said first bevel gear having a recess in a center portion thereof, and a drive pin receivable in any one of said recesses and a rotatable power tool chuck at opposite ends thereof, whereby rotation of said power tool chuck enables the reciprocation of said blade along an axis parallel to a rotation axis of said power tool chuck or along any axis orthogonal to said axis of said power tool chuck depending upon which recess the drive pin is received.

2. The power tool attachment of claim 1, wherein said recesses in said first and second bevel gears are hexagonal recesses.

3. The power tool attachment of claim 1, wherein said second bevel gears are smaller in diameter than said first bevel gear, such that said saw blade reciprocates at a greater frequency when said drive pin is engaged with the recess of said first bevel gear, than when said drive pin is engaged with either of said second bevel gears.

4. The power tool attachment of claim 1, further comprising a saw fence pivotally mounted to said housing between a position adjacent said saw blade and a position spaced from said saw blade.