DUAL REPLACEABLE HOLESAW BIT

• US 3,778,179 A
• Filed: 09/06/1972
• Issued: 12/11/1973
• Est. Priority Date: 09/06/1972
• Status: Expired due to Term

• Current Assignee: Dayton F. Rivas
• Original Assignee: Dayton F. Rivas
• Inventors: Rivas, Dayton F.
• Primary Examiner(s): Vlachos, Leonidas
• Application Number:
  US05/286,632
• Time in Patent Office: 461 Days
• Field of Search: 408/206,204,118,193,36,703 125/20
• US Class Current: 408/206
• CPC Class Codes: B23B 2222/56 Non-specified metals
• CPC Class Codes: B23B 2226/75 Stone, rock or concrete
• CPC Class Codes: B23B 2270/14 Constructions comprising exactly two similar components
• CPC Class Codes: B23B 51/04 Drills for trepanning
• CPC Class Codes: B23B 51/0411 with stepped tubular cutting bodies
• CPC Class Codes: B28D 1/041 with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
• CPC Class Codes: Y10T 408/375 Coaxial tools
• CPC Class Codes: Y10T 408/62 Coaxial
• CPC Class Codes: Y10T 408/895 Having axial, core-receiving central portion
• CPC Class Codes: Y10T 408/8957 and having stepped cutting edges

Abstract

A bit for use with a drill for cutting concentric holes of different diameters. The bit includes a holder comprising first and second elongated members which are movable relative to one another from a first position to a second position and viceversa. A first separately replaceable hole saw is connected to the first member and a separately replaceable hole saw is concentrically disposed within the first hole saw and connected to the second member. The second hole saw is retracted within the first hole saw when the members are in the first position. The second hole saw extends out of the first hole saw when the members are in the second position.

Claims

1. A dual replaceable saw element bit for use with a drill for cutting concentric holes of different diameters in a work piece, comprising:

a holder adapted to be fixedly connected to said drill, said holder including first and second elongated members which are longitudinally movable relative to one another from a first position to a second position and vice-versa, a first separately replaceable tubular hole saw connected to said first member and a second separately replaceable tubular hole saw concentrically disposed within said first saw and connected to said second member, said second saw being retracted within said first saw when said members are in said first position and second saw extending out of said first saw when said members are in said second position.

2. The bit as specified in claim 1 wherein each of said members includes threaded portions and wherein said first saw is screwed onto the threaded portion of said first member and said second saw is screwed onto the threaded portion of said second member.

3. The bit as specified in claim 2 wherein said first and second members are tubular, with said second member disposed within said first member, said first member being fixedly connected to said drill and including a longitudinally elongated slot therein and said second member including upstanding means disposed within said elongated slot for moving said second member relative to said first member from said first position to said second position and vice-versa.

4. The bit as specified in claim 3 wherein a cooling fluid is passed through the second tubular member to effectuate cutting of said work piece.

5. The bit as specified in claim 3 wherein locking means are provided to enable said tubes to be locked in said first and said second positions.

6. The bit as specified in claim 4 wherein said second tubular member includes a plural peripheral grooves in which O-rings are disposed to seal the space between said second member and the concentrically disposed first member.

7. The bit as specified in claim 5 wherein said locking means comprise additional slots offset from and normal to said elongated slot and into which slots said upstanding means is positioned.

8. A dual replaceable saw element bit for use with a drill for cutting concentric holes of different diameters in a work piece comprising:

a first replaceable tubular hole saw, a second replaceable tubular hole saw concentrically disposed within said first saw and a holder fixedly connected to said drill for mounting each of saiD saws on said drill and for enabling their separate removal thereform, comprising;

first and second elongated members longitudinally moveable relative to one another from a first to a second position and vice-versa, said first saw being connected to said first member and said second saw being connected to said second member, said second saw being retracted within said first saw when said members are in said first position and said second saw extending out of said first saw when said members are in said second position.

9. The bit as specified in claim 8 wherein each of said members includes threaded portions and wherein said first saw is screwed onto the threaded portion of said first member and said second saw is screwed onto the threaded portion of said second member.

10. The bit as specified in claim 9 wherein said holder includes means for moving said members relative to one another between said first and said second positions and vice-versa and means for locking said members in either said first or said second position.

11. The bit as specified in claim 10 wherein said first and said second members are tubular with said second member disposed within said first member, said first member being fixedly connected to said drill and including therein an elongated longitudinal slot, said moving means including an upstanding arm connected to said second member and disposed within said alot.

12. The bit as specified in claim 11 wherein said locking means comprise additional slots offset from a normal to said elongated slot and into which said arm is positioned.

13. The bit as specified in claim 11 wherein a cooling fluid is passed through the second tubular member to effectuate cutting of said workpiece.

14. The bit as specified in claim 13 wherein said second tubular member includes plural periphal grooves in which O-rings are disposed to seal the space between said second member and the concentrically disposed first member.

15. A dual saw element bit adapted for use with a drill for cutting a hole through a concrete floor to expose a metal electrical duct therein and for cutting a smaller diameter hole through the duct once exposed, comprising a first replaceable tubular hole saw having diamond cutting edge for cutting holes in concrete, a second replaceable tubular hole saw having a metal cutting edge for cutting holes in metal and concentrically disposed within said first saw and a holder fixedly connected to said drill for mounting each of said saws on said drill and for enabling their separate removal therefrom comprising:

first and second elongated members each including threaded portions thereon and being longitudinally movable relative to one another from a first to a second position and vice-versa, said holder including means for moving said members to said positions and locking means to lock said members in said positions, said first saw being screwed onto the threaded portion of said first member and said second saw being screwed onto the threaded portion of said second member, said second saw being retracted within said saw when said members are in said first position and said second saw extending out of said first saw when said members are in said second position.