DE202004010210U1 - Tool for drilling holes in wall has hollow cylindrical body, on one face side of which are cutting teeth and cylinder base connected to body - Google Patents

Abstract

The tool for drilling holes in a wall has a hollow cylindrical body, on one face side of which are cutting teeth (4) and a cylinder base connected to the body. The base is axially connectable with a clamping shaft or an adapter for such a shaft. The hollow cylindrical tool body (1) is firmly or releasably connected with a second cylinder base (3), which is spaced from the first cylinder base (2). The clamping shaft or the adapter for it is connected or connectable with a guide drill or a guide pin. The height of the hollow cylindrical body is equal to or larger than its diameter. The cutting teeth are formed for simultaneous cutting of wood, plastic, metal or mineral materials.

Description

The invention relates to a hole saw for wall openings. To the state of the art include known the following hole saws:

In German Patent 20 26 855 is a tool for cutting disks from sheet metal or the like. described; this has a clamping shaft, a guide drill and a hollow cylindrical cutting blade with on its face arranged cutting teeth special geometric training.

There is a similar one in German Patent 2237942 Drilling tool for cutting disks from sheet metal described; it includes also with an essentially hollow cylindrical tool body a variety of cutting teeth at one of its ends and with a clamping shaft.

The goods catalog of RUKO GmbH Präzisionswerkzeuge from 2004 contains on pages 153, 154 information on a cup-shaped hole saw tool with cutting teeth arranged on the front, as well as information on an arrangement to be attached to the bottom of this tool with a clamping shaft and guide drill holder 2 ,

All of these well-known hole saws serve especially cutting out slices of low thickness in comparison to the disk diameter.

For Wandungsdurchbrüche with a large diameter and greater hole depth they are unsuitable because they are larger than the diameter Amount of tool body the connection of the cylinder base with the clamping shaft (or with an appropriate adapter) not sufficiently stable axially and radially is.

For this reason, it is a task of the invention, a hole saw for deep Wall openings with increased axial and radial stability provided.

This object of the invention will by the feature mentioned in the characterizing part of claim 1, solved a "cylinder double floor", at which both floors connected to the clamping shank or an appropriate adapter are or will be.

Advantageous further developments the invention are characterized by the subclaims.

An embodiment of the invention is shown in the drawings and is described in more detail below.

Show it:

1A is a schematic perspective view of the hole saw tool body according to the invention with a double cylinder base;

1B a partial sectional view of the tool body according to 1A ;

2 is a schematic perspective view of an arrangement according to the prior art with clamping shaft and guide drill holder for connection to a simple cylinder base.

1 shows a schematic perspective view of the hole saw 0 according to the invention for wall openings, consisting of the hollow cylindrical tool body 1 with a first 2 and a second cylinder base 3 and with a concentric row of incisors 4 on the free end of the tool body.

The spaced apart cylinder bottoms 2 and 3 at the end of the tool body remote from the cutting tooth, these are firmly (non-releasably or releasably) connected.

Both cylinder bottoms 2 and 3 can be connected axially with a clamping shaft or with a corresponding adapter with clamping shaft (non-detachable or detachable).

The clamping shank is driven by a stationary or manually operated drilling machine, ie set in rotation. The hole saw rotates about its axis R in the direction of rotation Dr; with a corresponding feed in direction B, the rotating cutting ring gear 4 a cylindrical drill core is separated from the material to be drilled.

For reasons of clarity, in 1A and 1B the connection of the tool body with the clamping shank or with a corresponding adapter is not shown. There are enough known options for such a connection: welding; Screwing with positive connection etc.

According to the prior art, for example 2 such an adapter with a clamping shaft for releasable connection with a simple cylinder base is known. This adapter can easily be modified to connect to a double cylinder bottom, as it is related to 2 is also described.

The hole saw according to the invention 0 can be a guide drill or a guide pin (in 1A not shown), which protrudes from the imaginary cutting tooth plane in direction B.

2 shows an example of how a guide drill can be detachably attached in an adapter.

1B shows a partial sectional view of the tool body according to 1A ;

The cylinder bottoms 2 and 3 can be connected to the tool body in different ways: for example by welding or by screwing or riveting, provided the floors have a suitable edge. It is also possible to connect the base to the tool body by means of a bayonet lock.

The incisor ring is made of particularly cut-resistant material; he can be like can be welded as a ring-like part to the tool body (made of less cut-resistant material). For a good cut, the cutting teeth are crossed in the radial direction.

For drilling through thick walls often in one operation the height H of the hollow cylindrical tool body is equal to or larger than the (inner or outer) diameter D of the hollow cylindrical tool body.

This is especially true for piercing roofs to if exhaust pipes in a simple way through a roof hole to be made guided should be.

roofs often consist of layers of different materials such as roof tiles, Wood, insulating material.

The greater the height of the tool body is in Compared to the diameter, the requirements increase the radial and axial stability of the cutting ring gear ( even if a pilot drill or guide pin is provided).

The connection of the Clamping shaft or adapter with a single cylinder base Not; The clamping shaft or adapter must be connected to both cylinder bottoms his.

The cutting teeth are preferably designed so that she for universal simultaneous cutting of wood, plastic, Metal and mineral materials are suitable.

So in this context optimal cutting tooth design e.g. apart from wood.

The double bottom (instead of one very strong solid soil) requires less weight what for manual drilling tools to be handled is advantageous.

2 shows a schematic perspective view of an arrangement according to the prior art with clamping shaft and guide drill receptacle for connection to a simple cylinder base.

A bolt-like part 7 consists of three sections: tension shaft 7–1; Anti-rotation section 7–2 and threaded section 7–3.

The threaded section 7-3 can be screwed into the internal thread of an axial bore in the cylinder base. On the anti-rotation section 7-2 there is a disk which is displaceable in the direction Z and is secured against expansion against the bolt by positive locking 8th arranged, which is firmly connected to two anti-rotation pins 8-1 and 8-2. These locking pins are inserted into corresponding locking holes in the cylinder base. You can by a locking screw 9 in height on the bolt 7 be fixed.

The threaded section 7-3 and the anti-rotation section 7-2 is with an inner bore 9 for the twist-proof mounting of a pilot drill 10 (or guide pin). This ( 10 ) can be done with a locking screw 11 on the bolt 7 be fixed.

This in 2 The arrangement shown can easily be adapted for attachment to a double cylinder base. For example, this would be the upper opening 5 ( 1A ) in the cylinder bottom 2 run as a pure plug hole with high accuracy for a corresponding bolt section during the opening 6 (smaller than the opening 5 ) in the second cylinder bottom 3 im to be performed with an internal thread.

To attach the assembly, one can be on the underside of the cylinder base 3 lock nut to be tightened (not shown) are provided.

It would also be equally possible to axially arrange a sleeve with an internal thread between the two cylinder bases by means of a welded connection and an arrangement with a clamping shank and guide drill receptacle as in FIG 2 shown to use.

Claims (6)

Drilling tool, consisting of an essentially hollow cylindrical tool body, on one end of which cutting teeth are arranged and a first cylinder base connected to the tool body, which is axially connected or connectable to a clamping shaft or an adapter for a clamping shaft, characterized in that the hollow cylindrical Tool body ( 1 ) with a second cylinder base ( 3 ) is fixed or detachably connected, which from the first cylinder bottom ( 2 ) is spaced. Arrangement according to claim 1, characterized in that the clamping shaft or the adapter for the clamping shaft with the first ( 2 ) and the second ( 3 ) Cylinder bottom is firmly or releasably connected. Arrangement according to claim 1 or 2, characterized in that the Clamping shank or the adapter for the clamping shank with one pilot bit or a leadership pen is connected or connectable. Arrangement according to one of claims 1 to 3, characterized in that that the Height (H) of the hollow cylindrical tool body equal to or greater than its Diameter (D is. Arrangement according to one of claims 1 to 4, characterized in that the cutting teeth ( 4 ) are designed to simultaneously cut wood, plastic, metal and mineral materials. Arrangement according to one of claims 1 to 5, characterized in that the first ( 2 ) and / or the second ( 3 ) Cylinder bottom with the hollow cylindrical tool body ( 1 ) is connected by welding, screwing, riveting or by a releasable positive connection.