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Tool for forming a hole for a fastening element
| Details |
Inventors: Fischer, Athur;
Assignee:
Primary Examiner: Moon; Charlie T.
Assistant Examiner:
Attorney, Agent or Firm: Striker; Michael J.
A substantially cylindrical hole is drilled into a support structure, and the end of the hole remote from the point of entry of the drilling tool into the structure is enlarged in its cross-sectional area so as to provide abutment surfaces for spreading portions of a fastening element inserted into the hole subsequently to the drilling thereof. The drilling tool includes a drill shaft, and a drill bit connected to the free end of the drill shaft and having lateral cutting edges. The cutting edges may diverge in direction axially away from the drill shaft and a collar may be provided on the drill shaft which, in cooperation with the inner surface bounding the hole forms a fulcrum for a lever-type angular displacement of the drilling tool for increasing the cross-sectional area of the remote end of the hole. The collar may be mounted on the drill shaft for displacement between a plurality of axially spaced positions and for arresting in any one of these positions so as to adjust the drilling tool to a particular depth of the hole to be drilled. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, and first to FIG.
1 thereof, it may be seen that a drilling tool 1 includes a drill shaft 2 and a drill bit 3 in form of a drill leaf.
At least the drill bit 3 may be made of hard metal, such as alloyed steel.
The drill bit is provided with front cutting edges 4 and with lateral cutting edges 5 which in this embodiment extend parallel to the axis of the drill shaft 2.
The drill shaft 2 has a radius smaller than a hole 7 to be drilled in a support structure 10, and the drill bit 3 extends radially outwardly beyond the drill shaft 2 to a distance from the axis of the drill shaft 2 corresponding to the radius of the hole 7 to be drilled.
Having so described the drilling tool 1, the operation thereof will now be briefly discussed.
The drilling tool 1 is set into rotary motion about its longitudinal axis and applied to the region of the exposed surface of the support structure 10, not necessarily in that order, whereby the cutting edges 4 contact and penetrate such exposed surface.
By applying axial force to the drilling tool 1, the drilling tool 1 penetrates into the interior of the support structure 10 and to a predetermined depth.
In this manner, a cylindrical hole 7 of predetermined depth is obtained.
Now, in accordance with the invention, the bottom part of the hole 7 is to be provided with an enlarged portion 6.
This is achieved by angularly displacing the axis of the drilling tool 1 with respect to the center axis of the hole 7 which has just been provided as described above, whereby the cutting edges 5 remove additional amounts of material from the support structure 10 in the bottom region of the hole 7 until the cross-sectional area of such bottom region is sufficiently enlarged to form the enlarged portion 6, the purpose of which will be described later on.
The angular displacement of the axis of the drilling tool 1 may be performed in one plane only, in which case a V-shaped enlarged portion 6 is obtained, or in a circular motion in which case enlarged portion 6 is of generally conical configuration
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