DE338875C - Device for drilling square holes - Google Patents
Device for drilling square holesInfo
- Publication number
- DE338875C DE338875C DE1919338875D DE338875DD DE338875C DE 338875 C DE338875 C DE 338875C DE 1919338875 D DE1919338875 D DE 1919338875D DE 338875D D DE338875D D DE 338875DD DE 338875 C DE338875 C DE 338875C
- Authority
- DE
- Germany
- Prior art keywords
- square holes
- drill
- guide piece
- drilling
- drilling square
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q27/00—Geometrical mechanisms for the production of work of particular shapes, not fully provided for in another subclass
- B23Q27/006—Geometrical mechanisms for the production of work of particular shapes, not fully provided for in another subclass by rolling without slippage two bodies of particular shape relative to each other
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Interface Circuits In Exchanges (AREA)
Description
Die Erfindung bezieht sich auf eine Verbesserung der bekannten Vorrichtung zum Bohren eckiger, z. B. quadratischer Löcher. Bisher wurde hierbei ein auf das Werkstück gespanntes Führungsstück für den dreikantigen Bohrstahl verwendet, dessen Ausschnitt dem zu bohrenden Loch entsprach. Die auf diese Weise gebohrten Löcher hatten aber den Nachteil, daß die Wandungen konkav geschweift waren, also keine ebenen Flächen darstellten und somit die Löcher nachgearbeitet werden mußten. Um diesen Nachteil zu vermeiden, soll nach der Erfindung ein Führungsstück verwendet werden, dessen Ausschnitt mit konvex geschweiften Wandungen versehen ist, um die vorbeschriebene Wirkung der wälzenden Bohrerarbeit, die ein schärferes Anpacken des Bohrers auf den Mittelteilen der Wandflächen bedingt, auszugleichen und somit quadratische Löcher mit scharfen Ecken und ebenen Wandflächen zu erzielen.The invention relates to an improvement of the known device for Drilling angular, e.g. B. square holes. So far this has been done on the workpiece tensioned guide piece used for the triangular drill steel, the cutout of which the corresponded to the hole to be drilled. But the holes drilled in this way had that Disadvantage that the walls were concave, so they did not represent flat surfaces and thus the holes were reworked had to be. In order to avoid this disadvantage, according to the invention, a guide piece is to be used whose cutout is provided with convex curved walls to the above-described effect of the rolling drill work, which a sharper Gripping the drill on the middle parts of the wall surfaces conditionally, equalize and thus achieving square holes with sharp corners and flat wall surfaces.
In der Zeichnung ist ein Bohrer und ein Führungsstück zur Herstellung quadratischer Bohrungen dargestellt.In the drawing is a drill and a guide piece for making square Holes shown.
Fig. ι zeigt eine Seitenansicht des Bohrers, Fig. 2 seine Stirnansicht,
Fig. 3 eine Aufsicht auf das Führungsstück undFig. Ι shows a side view of the drill, Fig. 2 shows its front view,
Fig. 3 is a plan view of the guide piece and
Fig. 4 eine Seitenansicht des Führungsstückes. Fig. 4 is a side view of the guide piece.
Der Bohrer α aus Dreikantstahl ist derartig flach geschliffen, daß er das Bestreben des Verlaufene hat, d. h. ohne Spitze nur mit horizontal schneidenden Kanten. Über dem Werkstück wird das Führungsstück b derartig angebracht, daß die Führungsöffnung c über dem zu bohrenden Loch zu liegen kommt. Dann wird genau wie sonst beim Bohren verfahren. Beim Arbeiten wird der Bohrer a seitlich weggedrückt, wobei sich seine Kanten d gegen die Wandungen des Führungsloches c legen und sich dort so wälzen, daß sie in die Ecken des Führungsloches c gebracht werden und in dem Werkstück ein Loch gebohrt wird, welches dem Loch c in. dem Führungsstück δ entspricht. Das Material des Führungsstückes b wird so gewählt, daß seine Härte der Härte des Bohrstahles entspricht. Die konvexe Form der Wandungen des Ausschnittes c bewirkt dabei, daß durch das Wälzen des Bohrers .im Ausschnitt das verschieden starke Anpacken des Bohrers in den Ecken und den freien Wandflächen derart ausgeglichen wird, daß scharfeckige Löcher mit ebenen Wandflächen im Werkstück gebohrt werden.The drill α made of triangular steel is ground so flat that it has the tendency to run, ie without a point only with horizontally cutting edges. The guide piece b is attached over the workpiece in such a way that the guide opening c comes to lie over the hole to be drilled. Then proceed exactly as usual for drilling. When working, the drill bit a is pushed away to the side, its edges d lie against the walls of the guide hole c and roll there so that they are brought into the corners of the guide hole c and a hole is drilled in the workpiece which corresponds to the hole c in. corresponds to the guide piece δ. The material of the guide piece b is chosen so that its hardness corresponds to the hardness of the drill steel. The convex shape of the walls of the cutout c has the effect that by rolling the drill.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2591229A GB338875A (en) | 1929-08-26 | 1929-08-26 | Improvements in or relating to automatic or semi-automatic telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE338875C true DE338875C (en) | 1921-07-04 |
Family
ID=10235347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1919338875D Expired DE338875C (en) | 1929-08-26 | 1919-12-02 | Device for drilling square holes |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE338875C (en) |
| FR (1) | FR709208A (en) |
| GB (1) | GB338875A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6929433B2 (en) * | 2000-10-12 | 2005-08-16 | Randall C. Andronica | Drill and surface insensitive starting drill for difficult materials and deep holes |
-
1919
- 1919-12-02 DE DE1919338875D patent/DE338875C/en not_active Expired
-
1929
- 1929-08-26 GB GB2591229A patent/GB338875A/en not_active Expired
-
1930
- 1930-04-12 FR FR709208D patent/FR709208A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6929433B2 (en) * | 2000-10-12 | 2005-08-16 | Randall C. Andronica | Drill and surface insensitive starting drill for difficult materials and deep holes |
Also Published As
| Publication number | Publication date |
|---|---|
| FR709208A (en) | 1931-08-03 |
| GB338875A (en) | 1930-11-26 |
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