Apparatus for removing the drillings from the drilling site of a drill

• US 4,036,308 A
• Filed: 04/07/1975
• Issued: 07/19/1977
• Est. Priority Date: 04/09/1974
• Status: Expired due to Term

• Current Assignee: Gebruder Heller Verwaltungsgesellschaft Mit Beschrankter Haftung
• Original Assignee: Gebruder Heller Verwaltungsgesellschaft Mit Beschrankter Haftung
• Inventors: Dellenberg, Hugo
• Primary Examiner(s): Purser, Ernest R.
• Application Number:
  US05/565,568
• Time in Patent Office: 834 Days
• Field of Search: 173/60, 173/75, 175/71, 175/212, 175/213, 417/88, 417/160, 279/20, 15/409, 15/408
• US Class Current: 173/75
• CPC Class Codes: B23Q 11/0046 by sucking
• CPC Class Codes: E21B 21/16 using gaseous fluids E21B21/14 takes precedence
• CPC Class Codes: Y10T 279/17111 Fluid-conduit drill holding
• CPC Class Codes: Y10T 408/453 and means to move gaseous fluid by application of vacuum

Abstract

In the process and apparatus for removing the drillings from the drilling te of a drill described, removal is effected through a conduit, extending along the axis of a drill and possibly an adapter for a drilling machine, by a vacuum provided by a compressed-air stream traversing the removal conduit, said compressed air also serving to blow the drillings sucked into the conduit out of the conduit and away from the drilling site.

Claims

1. An apparatus for removing the drillings from a drilling site of a drill of a drilling machine provided with a housing, a chuck and a motor for driving said drill which is inserted into the cavity of the chuck, said apparatus comprising:

a. a suction conduit having an open end at said drilling site and a closed end spaced therefrom, said conduit extending in the direction of the rotational axis of said drill for sucking in drillings from the drilling site toward said closed end;

b. a wall having a cylindrical outer surface, said wall surrounding said closed end of said suction conduit and a portion of said suction conduit adjacent to said closed end, said cylindrical outer surface having first and second axially spaced holes formed on opposed sides thereof, and first and second cross conduits connecting said first and second holes respectively to said portion of said suction conduit, said first and second cross conduits meeting at said suction conduit to form a continuous passage through said wall for conveying a compressed air stream from said first hole to said second hole across said suction conduit;

c. a connecting ring surrounding said cylindrical wall surface and forming an inner air supply annulus closed by said cylindrical wall surface;

d. a compressed air source and a connecting piece on said connecting ring for connecting said air supply annulus to said compressed air source; and

e. said connecting ring being adapted for non-rotating connection to said housing in such a position that said first axial hole opens into said inner air supply annulus, and said first cross conduit connects said inner air supply annulus with said suction conduit, and said second axial hole opens into an area outside said inner air supply annulus, and said second cross conduit connects said suction conduit with said second axial hole to remove the drillings from said portion of said suction conduit by said compressed air passing through said first and second cross conduits and across said suction conduit.

2. An apparatus as defined in claim 1, wherein said connecting ring forms an inner exhaust air annulus closed by said cylindrical wall surface, said exhaust air annulus including, a connecting piece for connecting said annulus to a line for removing said drillings, and wherein said second cross conduit connects said suction conduit to said exhaust air annulus through said second hole.

3. An apparatus as defined in claim 1, wherein both said first and second cross conduits on the one hand and said suction conduit on the other hand define two longitudinal axes forming an acute angle, said first cross conduit being closer to said drilling site than said second cross conduit.

4. An apparatus as defined in claim 1, wherein said first and second cross conduits together form a Venturi-tube having a constricted middle section, and wherein said suction conduit crosses said middle section of said Venturi-tube.

5. An apparatus as defined in claim 1, wherein said compressed air source is provided by a fan wheel attached to said driving motor.

6. An apparatus as defined in claim 1, wherein said drilling machine is provided with a spindle forming said cylindrical wall surface and said chuck for said drill, and wherein said portion of said suction conduit is connected to said cavity of said chuck.

7. An apparatus as defined in claim 1, wherein said connecting ring is affixed to said housing of said drilling machine.

8. An apparatus as defined in claim 1, wherein said drill forms said cylindrical wall and wherein said connecting ring has a form that permits fitting it onto said cylindrical wall of said drill.

9. An apparatus as defined in claim 8, wherein said connecting ring is rotatably connected to said drill but not axially displaceable.

10. An apparatus as defined in claim 8, wherein said suction conduit forms a blind hole in said drill.

11. A drill comprising:

a forward end for engagement at a drilling site;

a shank having a cylindrical outer surface with first and second axially spaced substantially opposed holes formed therein;

an axial suction conduit extending from said forward end to a dead end within said shank;

first and second cross conduits connecting said first and second holes respectively, with said axial suction conduit, said cross conduits having a maximum cross sectional area at said holes and a minimum cross sectional area at said suction conduit and being substantially aligned with each other to form a Venturi-tube extending through said shank with a constricted middle section intersecting said suction conduit; and

a connecting ring surrounding a portion of said cylindrical outer surface to form an air supply annulus enclosed by said connecting ring, said connecting ring being rotatably connected to said outer surface of said shank in a position such that said first axially spaced hole opens into said air supply annulus, and said second axially spaced hole opens into an area outside said air supply annulus.

12. A drill comprising:

a forward end for engagement at a drilling site;

a shank having a cylindrical outer surface with first and second axially spaced substantially opposed holes formed therein;

an axial suction conduit extending from said forward end to a dead end within said shank;

first and second cross conduits which connect said first and second holes respectively with said suction conduit, said first and second cross conduits being substantially aligned to form a continuous passage which intersects said suction conduit at an acute angle at a point adjacent to said dead end of said suction conduit; and

a connecting ring surrounding a portion of said cylindrical outer surface to form an air supply annulus, said connecting ring being rotatably connected to said outer cylindrical surface of said shank in a position such that said first axially spaced hole opens into said air supply annulus, and said second axially spaced hole opens into an area outside said air supply annulus.

13. An adaptor for use with a drilling machine including:

a chuck having a substantially cylindrical surface with first and second axially spaced substantially opposed holes formed therein and a hollow cavity to accommodate a drill, said chuck further having an axial suction conduit which extends from a dead end within said chuck to an open end which communicates with said cavity;

first and second cross conduits which connect said first and second holes respectively with said suction conduit, said first and second cross conduits being substantially aligned to form a continuous passage which intersects said suction conduit at an acute angle at a point adjacent to said dead end of said suction conduit; and

a connecting ring surrounding a portion of said cylindrical outer surface of said chuck to form an air supply annulus closed by said connecting ring, said connecting ring being rotatably connected to said outer cylindrical surface of said chuck in a position such that said first axially spaced hole opens into said air supply annulus, and said second axially spaced hole opens into an area outside said air supply annulus.