Drilling tool
AssigneeKansai Kogu Manufacturing Co., Ltd.
InventorMasato Kishimoto
Life of this patent
Estimating the term…
Abstract
A drilling tool comprises a holder unit adapted to be detachably mounted to a hand-held drive unit, and a hole saw unit detachably mounted to the holder unit, the hole saw unit including, as a unit, a cylindrical cutter and a center pin, the holder unit including, as a unit, a spring and a slider disposed to allow reciprocating motion of the center pin, whereby the drilling tool is able to constantly form an appropriate hole in a workpiece such as a thin iron plate, a thick iron plate, or a pipe having a round surface, and expandable components of the drilling tool are formed as a unit to allow for ready replacement.
Claims4
A drilling tool comprising a holder unit (A) adapted to be detachably mounted to a drive unit, and a hole saw unit (B) detachably mounted to said holder unit,
- said holder unit (A) including a holder section (3) detachably holding said hole saw unit, a cylindrical section (4) extending from said holder section (3), a slider (5) slidable axially within said cylindrical section (4), and a spring (6) disposed to urge said slider (5) toward said holder section (3),
- said hole saw unit (B) including a cylindrical cutter (10) having a mounting portion (15) detachably held in said holder section (3) and including a central through hole (16), and a center pin (11) slidably inserted into said central through hole (16),
- said center pin (11) having a proximal end (11a) and a distal end (11b), said distal end (11b) extending beyond said cylindrical cutter, and said proximal end (11a) being located in a face-to-face relation to said slider (5) when said hole saw unit (B) is mounted to said holder unit (A).
A drilling tool comprising a holder unit (A) adapted to be detachably mounted to a drive unit, and a first hole saw unit (B1) and a second hole saw unit (B2) selectively mountable to said holder unit,
- said holder unit (A) including a holder section (3) detachably holding one of the hole saw units (B1) and (B2) selectively, a cylindrical section (4) extending from said holder section (3), a slider (5) slidable axially within said cylindrical section (4), and a spring (6) disposed to urge said slider (5) toward said holder section (3),
- each of said first hole saw unit (B1) and said second hole saw unit (B2) including a cylindrical cutter (10) having a mounting portion (15) detachably held in said holder section (3) and including a central through hole (16), and a center pin (11) slidably inserted into said central through hole (16),
- said center pin (11) having a proximal end (11a) and a distal end (11b), said distal end (11b) extending beyond said cylindrical cutter, and said proximal end (11a) being located in a face-to-face relation to said slider (5) when each of said first hole saw unit (B1) and said second hole saw unit (B2) is mounted to said holder unit (A),
- said center pin (11) of said first hole saw unit (B1) being a drill (17) having a shank (11c) slidably inserted into said central through hole (16) of said mounting portion (15), said first hole saw unit (B1) further including locking means (18) for non-slidably and non-rotatably locking said shank (11c) of said drill (17),
- said center pin (11) of said second hole saw unit (B2) being a positioning pin (19) having a pointed end (19a).
Dependencies are inferred from the claim text.