DE1472C

DE1472C - Drill chuck with centrir device

Info

Publication number: DE1472C
Application number: DE000000001472DA
Authority: DE
Original assignee: Edouard Dubied et Cie SA
Current assignee: Edouard Dubied et Cie SA
Priority date: 1877-12-11
Filing date: 1877-12-11
Anticipated expiration: 1897-12-12

Description

Pat en τ-Ansprüche:Pat en τ claims:

1. Die Anwendung eines Centrirsystems bei Bohrfuttern, aus den aneinanderliegenden Leitbacken bestehend, deren Form Fig. 5 zeigt, und welche sich in einem gleichseitig dreieckigen Prisma bewegen.1. The use of a Centrir system for drill chucks from the adjacent There are guide jaws, the shape of which is shown in FIG. 5, and which are at the same time move triangular prism.

2. Die Anwendung der in einem der Leitbacken angebrachten Bewegungsschraube, welche in ein Gewinde eines anderen Leitbackens eingreift, so dafs beide gleichzeitig durch die Schraube bewegt werden.2. The use of the motion screw installed in one of the guide jaws, which is shown in a thread of another guide jaw engages, so that both through the Screw can be moved.

3. Die Anordnung, die Gleitbacken durch Flächen zu verschieben, welche den Berührungskanten der ersteren mit dem Bohrer genau gegenüberstehen, was zur Folge hat, sie nur der Kompressionskraft auszusetzen und jede Druckrichtung zu vermeiden, welche sie durch Biegung brechen oder aus der Normalstellung bringen könnte.3. The arrangement to move the sliding blocks through surfaces, which the contact edges face the former with the drill exactly, with the result of only exposing them to the compressive force and to avoid any direction of pressure which they break by bending or out of the Could bring normal position.

Hierzu ι Blatt Zeichnungen.For this purpose ι sheet of drawings.

Claims

1S77.

Great

ARD DUBIED in COUVET (Switzerland). Drill chuck with centrir device.

It was entered into the German Empire on December 12, 1877.

The chuck, which contains the jaws, is externally cylindrical. Inside it has three flat surfaces, which are equidistant from the center and form a prism, whose cross-section is an equilateral triangle. At the frontal area it is through by means of one closed with three screws. Around the drill chuck by means of a conical To attach the shank to the drill head of the drill, the back of the same is conical turned out.

Three congruent, mutually displaceable guide jaws made of hardened steel, 1, 2, 3, Fig. 1, which lie with the surfaces k 1, Fig. 5, and touch the prism with the surfaces m , have such a cross-section that they Fill in the prism in every position, Figs. 6 and 7. The surfaces η push towards the center three congruent sliding jaws y of hardened steel, the inner edges of which clamp the drill and center it precisely. The sliding blocks are guided on both sides through the radial grooves in the base and in the cover. Each sliding jaw has two sliding ribs which engage in two grooves χ made in the guide jaws, which run parallel to the surfaces η ; this forces the sliding jaws to move away from the center when the drill chuck is opened.

The movement is communicated to the guide jaws by a steel screw ν , which is located in a recess of the guide jaw no. ι can rotate freely and engages in a thread which is located in the middle of the guide jaw no. 3 is located. The screw, which has a hexagonal hole, is turned by means of the key, Fig. 4. The guide jaws No. 1 and 3 are moved in opposite directions by the screw. No. 1 pushes No. 2 forward, while No. 3 gives way to the latter.

This construction is the one in which the screw only moves one guide jaw (Fig. 8), which latter moves the other two, much to be preferred than in the first Arrangement, the frictional resistance and the pressure of the individual pieces on each other are a lot smaller, therefore less wear and tear and greater ease of movement of the Apparatus is achieved.