DE7000268U - DEVICE FOR PRODUCING CIRCULAR CUTOUTS FROM PANELS. - Google Patents

Description

GUNTERLGEISS

PATENT ENGINEER

Γ GONTER L GEISS ■ 7160 RADOLFZELL ■ MARKTPLATZ 9

To the

German Patent Office 8 Munich Zweibrückenstr.

7760 RADOLFZEIL / BODEKS

Morktpiat. 9
Telephone (0 77 32) 762

Banks

District Savings Bank F ^ jdotfzell K33

Postal check account Kurisruhe 11166

Your message from

Your mark

My / t-icm-ri

J 238-69

December 29, 1969

File number: reference

Erwin Jacket, Insurance Inspector, 77oo Singen, Bruderhofstraße T4

and

Friedrich Martin, carpenter, 77oo Singen, Herderstrasse 7

Device for making
circular cutouts from panels

_ 2 -

The innovation relates to a device for producing circular cutouts from panels, preferably made of metal and plastic, which has cutting steels which can be clamped in holders and which are guided in a circle.

The innovation is based on the task of designing a device of this type in such a way that it enables the production of clean circular sections when operated by hand and that it can also be used on very strong steel sheets as well as on panels that are only accessible from one surface.

This object is achieved according to the invention in that a sleeve is rotatably mounted on a shaft that can be detachably rigidly connected to the panel, the base of which is designed to receive holders carrying the sons and the head of which is rigidly connectable with rotary handles. The head-side upper section of the shaft is advantageously provided with an external thread and carries a feed part provided with a nut thread, which has at least one handle and a ball bearing that can be pressed onto the head of the sleeve.

Kin embodiment of the innovation is in the drawings and is described in more detail below. Show it

Fig. 1 is a vertical section through the device in the working position

according to the line A - B in the Pig. 2 and 3, Fig. 2 is a stepped cross-section through the head of the

Device according to the line C - D in Fig. 1 and Fig. 3 a stepped cross section through the foot of the

Device according to the line E - F in Fig. 1.

The device according to the innovation is designed in such a way that it can be rigidly connected to the panel 1 in the center of the desired section of the circle. An advantageous type of this connection consists in that a central shaft 2 of the device, the end face of which is expediently slightly concave on the foot, is provided with a female thread coaxially from the foot. A grub screw 9a can then be inserted into this nut thread 9, the other end of which can be screwed from the outside into a thread Ib cut into the panel coaxially to the desired circular section la. In this way, the shaft 2 can also be rigidly connected to the board 1 when its back side is inaccessible. Otherwise, of course, nothing stands in the way of using a normal Masohinen screw 9b, which penetrates a simple hole in the panel 1 and the head of which presses the shaft 2 firmly against the panel 1, the concave shape of the lower end face of the shaft 2a its adhesion even improved.

A sleeve 3 is rotatably mounted on the shaft 2, the foot 4 of which is for receiving the holder 6 carrying the cutting tools 5

- 4 -

is trained. In the example shown, the barrel 4 is designed as a step and the holder 6 consists of a ring in which the cutting tools 5 are arranged approximately concentrically and are clamped, for example, with screws 11 inserted radially ± u the Hing 6. The Birg is via suitable drivers Io -

in the example consisting of recessed short bolts - attached to the sleeve 3 on its base 4, secure against twisting, and can can be exchanged for rings with other cutting diameters.

Of course, the sleeve 3 can also be equipped with other brackets, as are already known in various embodiments Cutting at different cutting angles is known and does not require any special discussion.

Rotary handles 8 are advantageously attached to the head 7 of the sleeve 3 in such a way that they can be exchanged in different lengths, e.g. can be rigidly connected to the sleeve 3 by screwing. This form of the device is already available for less hard materials> e.g. plastic plate * !, aluminum sheets and the like, fully usable. After the rigid sitting down of the shaft 2, the head end of which is also e.g. for attaching a key can be provided, the sleeve 3 is pushed on with inserted flalterungen 6 and cutting tools 5 and the circular section la by rotating the sleeve 3 by means of the rotary handles

7000268aft7.70 - ^s -

8 cut into panel 1 under slight axial pressure . After the cut has been pierced, the cutout remains attached to the shaft 2 and can be removed without, for example, in the case of sheets that are only accessible from one side, there is the risk of this cutout falling into the workpiece.

If, on the other hand, the board 1 is made of hard material such as | made of strong sheet steel, it is advantageous if the axial pressure on the sleeve 3 does not have to be carried out by hand during the cutting process, but instead a suitably designed feed part is provided for this purpose. According to the example shown, this can be done in that the head-side upper section of the shaft 2 is provided with an external thread and the feed part 13 is given a suitable nut thread so that it can be screwed onto the end face of the sleeve 3 and this can be removed when the screw guide 12 is tightened further. 13 is pressed axially towards the foot.

For this purpose, the feed part has a suitable handle, for example from flats or flats that can be grasped with a key can consist of usable handles according to the example. This handle 14 enables a feed which is externally adapted to the cutting performance and which is always in both directions can be corrected. It is advantageous for rotating the sleeve as well as for smooth feed if between the adjacent end faces of the sleeve

head 7 and the feed part 13,14 a ball bearing 15, roller bearing or the like. Is turned on, which either loosely inserted or attached to only one part - as in the example on the sleeve head 7.

For a clean cut, it is advantageous if the sleeve 3, 4, 7 and correspondingly the shaft 2 have a certain Have length. To reduce the friction between the sleeve 3 and the shaft 2, the sleeve 3 can be in its central area have a recess 3a, so that only an annular contact zone remains at the foot rnd at the head 4,7, which, however, results in perfect cutting steel guidance.

The advantages of the innovation are that the device can be transported easily and easily even by inexperienced forces can be operated. It can be brought to any stationary workpiece and can also be used on workpieces that are only are accessible from one side, It can be used for all common board materials and creates a centerable, flat circular cut, for which no reworking is required is.

Claims (1)

PROTECTION CLAIMS: 1. / Device for making circular cutouts from panels preferably made of metal and plastic, which has cutting steels which can be clamped in brackets and which are circular are guided, characterized in that a sleeve (2) can be detachably connected to the panel (1)? .tarrely connectable (3) is rotatably mounted, the foot (4) of which is designed to accommodate brackets (6) carrying the cutting steels (5) and whose head (7) can be rigidly connected to rotary handles (8). 2. / Device according to claim 1, characterized in that the shaft (2) at the foot end has a slightly concave end face (2a), from which a bore with a nut thread (9) cut coaxially into the shaft (2) is* 3. / Device according to claim 2, characterized in that the head end (2b) of the shaft (2) with formations to the approach a suitable key. 4. / Device according to claim 1, characterized in that the foot (4) of the sleeve (3) is stepped on the outside so that the holder (θ), which is designed as a ring, has a driver (lo) can be interchangeably plugged onto the sleeve, while the Cutting steels (5) are held in place by clamping screws (ll) inserted radially into the holder (β). 5. / Device according to one of Claims 1 to 4, characterized in that the top corner of the stick (2) on the head side is old External thread (12) is provided and a BtLt female thread provided feed part (13) carries which at least one Has a handle (14) and a ball bearing (15) which can be printed onto the head (7) of the sleeve (3). 6. / Apparatus according to claim 5, characterized in that the ball bearing (x5) is firmly attached to the head (7) of the sleeve (3). T. / device according to one of claims 1 to 6, characterized in that the central zone of the sleeve (3) against the shaft (2) has a recess (3a) and only as head (7) and on the foot (4) each with an annular surface close to the shaft (2) adjacent sleeve zones are provided. The representative: GDNTER LGEISS PATENT ENGINEER RAD O LFZ E LL / BODENSEE