DE9308009U1 - PRESSURE PIECE WITH DETACHABLE THREADED PIN AND SECURITY TO FALL OUT - Google Patents

Description

G 1918-53-ka 4 May 1993

Applicant: Otto Ganter & Co. KG, Normteilefabrik, Triberger Straße 3, 7743 Furtwangen

Pressure piece with removable threaded pin and lock against falling out

The innovation relates to a pressure piece and a threaded pin engaging in the pressure piece, whereby the threaded pin has a head part at its lower end which can be inserted into an inner recess of the pressure piece.

Such pressure pieces in conjunction with threaded pins are used to transmit clamping forces, whereby the threaded pin is screwed into a clamping part and essentially transfers the clamping force to the pressure piece in the direction of its longitudinal axis. The purpose of the pressure piece is to transfer the clamping force acting on the threaded pin to a flat surface over as large an area as possible and also to be able to clamp surfaces inclined to the axis of the threaded pin.

To prevent the pressure piece from falling out of the threaded pin, it is known to hold the head of the threaded pin in the pressure piece in such a way that a snap ring is arranged on the inner circumference of the bore in the pressure piece, which is arranged in a groove and which surrounds the head of the threaded pin.

The state of the art is illustrated by a drawing from the

Applicant's catalogue, where it is shown that/3 according to DIN 6311 a threaded pin engages in a pressure piece and the snap ring is intended to secure the pressure piece against falling off the head of the threaded pin.

When using such a snap ring in conjunction with the pressure piece, it has been shown that the assembly and disassembly of the threaded pin on the pressure piece is very difficult.

First of all, it is very important for a perfect assembly that the depth of the groove in which the snap ring is located is precisely dimensioned in order to avoid the snap ring slipping in the groove if it is too large and the insertion of the head of the threaded pin into the recess in the pressure piece is no longer possible.

Furthermore, it is important with the known pressure piece that the diameter of the hole in the pressure piece that adjoins the groove of the snap ring cannot be made arbitrarily large in order to prevent the snap ring from slipping downwards. It must therefore not be made too large in order to prevent the snap ring from slipping downwards into the hole.

Furthermore, it is important to machine the pressure piece in such a way that a certain swivel angle of the threaded pin is guaranteed for non-parallel clamping surfaces. As a rule, a swivel angle of up to is aimed for, although the known solution only allows a swivel angle of around 5°.

The assembly of the threaded pin in the pressure piece is 5 extremely difficult because first the head of the

The threaded pin must be inserted into the recess of the pressure piece until the head rests on the snap ring. According to the preferred assembly instructions, the pressure piece should be held in such a way that the snap ring is in the recess and the open side is pointing downwards. The threaded pin is tilted as far as possible towards the open side of the snap ring and pressed in.

This results in a relatively complex assembly with the risk that, if the snap ring is not in the required position, the locking insertion of the bolt of the threaded pin into the pressure piece becomes impossible.

The innovation is therefore based on the task of further developing a pressure piece of the type mentioned at the beginning in such a way that it can be connected more easily and securely to a threaded pin and a swivel angle of 0 to 10° can be achieved.

To solve the problem posed, the innovation is characterized by the technical teaching of claim 1.

The essential feature of this innovation is that there is now a retaining spring or a retaining disk, which retaining spring or retaining disk centers itself in the recess of the pressure piece, so that a self-centering, spring-loaded locking opening is formed that always remains in the middle. This technical teaching has the essential advantage that the pressure pin of the threaded pin can be mounted and dismantled without difficulty, because the locking opening in the

-A-

The pressure piece is always positioned centrally in the recess of the pressure piece and the pressure pin of the threaded pin can now always be pressed precisely into this self-centering locking opening.

This has the additional advantage that a larger swivel angle is now possible for the threaded pin, because the type of centering via a self-centering retaining spring or retaining disk allows an internal bore of any size in the pressure piece.

This was not possible in the state of the art because the hole following the recess for holding the snap ring had to be measured relatively precisely in order to avoid the snap ring falling into this hole (if this hole is chosen to be too large in diameter).

These problems do not exist with the new design, because the retaining spring or retaining disk that centers itself in the pressure piece always keeps the catch, the catch opening defined by the retaining spring or the retaining disk, centered and springs in the pressure piece, so that there is no longer any danger of the retaining spring or the retaining disk slipping in the pressure piece and the catch opening becoming off-center, as was the danger with the prior art.

There are several possibilities for the design of the retaining spring or the retaining disk 0, all of which are covered by the inventive concept of the innovation.

It is preferred to manufacture the retaining spring from a round wire because this is particularly simple in terms of manufacturing technology. In a modified version,

However, it is preferred to design the retaining spring as a leaf spring, i.e. with a square or rectangular cross-section.

In a third embodiment, instead of the retaining spring made of a round wire or a rectangular or square wire, it is provided to use a retaining disk in which radially inwardly directed resilient locking projections are arranged, which solve the same task (namely the definition of a self-centering locking opening) as the previously mentioned retaining spring.

The material for the retaining spring or the retaining disc can be made of plastic or metal.

The subject matter of the present innovation arises not only from the subject matter of the individual protection claims, but also from the combination of the individual protection claims with one another.

All information and features disclosed in the documents, including the summary, in particular the spatial configuration shown in the drawings, are claimed as essential to the invention insofar as they are new compared to the prior art, individually or in combination.

In the following, the invention is explained in more detail using drawings showing several possible embodiments. The drawings and their description reveal further essential features and advantages of the invention.

Show it:

Figure 1: the threaded pin mounted in a pressure piece in two different swivel positions;

Figure 2: Top view of the pressure piece with the threaded pin removed in the direction of arrow II in Figure 3;

Figure 3: Partial section through the pressure piece according to Figure 2;

Figure 4: a top view of a opposite Figure 2

modified embodiment of a retaining spring;

Figure 5: a modified embodiment of a retaining spring compared to Figure 4;

Figure 6: Top view of a retaining disc.

In Figure 1, a threaded pin 1 has a pressure pin 4. In a manner known per se, the threaded pin 1 is provided with a thread 3 and is held in a receiving bore of a pressure piece 7 so that it can be pivoted by a pivot angle 2. The lower region of the threaded pin 1 is designed as a pressure pin 4, which has a neck 5 of reduced diameter and an adjoining head 6 of enlarged diameter.

In the recess 16 of the pressure piece 7, a retaining spring 8 is arranged, which has a diameter such that it snaps into place behind the head 6 of the pressure piece 4. The recess 16 is covered at the top by a disk 10.

The retaining spring 8 is held in a recess 9 of the pressure piece 7, whereby it is important that the retaining spring has external windings 13 which rest resiliently and self-centeringly on the inner circumference of the recess 9, so that the retaining spring 8 is always held centrally to the recess 16 in the pressure piece 7.

In the embodiment according to Figure 2, a symmetrical retaining spring is proposed which consists of a unitary part which has two inwardly directed spring legs 11, 12 which intersect the recess 16 in the pressure piece approximately tangentially, wherein the spring legs 11, 12 are designed as free ends of the retaining spring 8 and thus resiliently define a locking opening 17.

The head 6 of the threaded pin 1 is then pressed into the recess 16, whereby the spring legs 0 11,12 are briefly spread radially outwards and snap into the assembly position shown in Figure 1 behind the head 6 of the threaded pin 1.

It is therefore important in all embodiments that the retaining spring 8 centers itself in the area of the pressure piece 7.

In the embodiment according to Figure 4, a further retaining spring 15 is shown, which also defines a 0 self-centering locking opening 17, with an outer free spring leg 14 resting on the inner circumference of the recess 9 and also an outer winding 13, while a single inner spring leg 25 in conjunction with an opposite spring bend 26 of the retaining spring 15 forms the self-centering

Latching opening 17 defined.

In the embodiment according to Figure 5, a further retaining spring 18 is shown, which essentially consists only of a U-shaped part with two opposing spring legs 19, 20. This spring leg 19 is inserted into the pressure piece from the outside, so that the spring legs 19, 20 assume approximately the same position as the spring legs 11, 12 in the embodiment according to Figure 2.

In the embodiment according to Figure 6, instead of a retaining spring 8, 15, 18, a retaining disk 21 is proposed, in which it is important that its outer circumference 24 in turn rests approximately positively on the inner circumference of the recess 9, whereby it is important that in this embodiment the disk 10, which holds the previously mentioned retaining springs 8, 15, can be omitted and that the disk 10 itself can be designed as the retaining disk 21 shown in Figure 6.

To prevent it from falling out, the retaining disk 21 is then pressed into the recess on the pressure piece 7.

The self-centering locking opening 17 is formed by radially directed slots 22 that are evenly formed on the inner circumference and that form locking projections 23 that are directed radially inwards and are designed to be resilient. These locking projections 23 protrude radially inwards beyond the recess 16, so that these locking projections 23 also rest in a resilient and locking manner behind the head 6 of the pressure piece 7 of the threaded pin.

1 threaded pin

2 Swivel angle 3 Thread

4 pressure pins

5 Neck

6 Head

7 Pressure piece 8 Retaining spring 9 Countersink

10 slice

11 Spring legs

12 Spring leg 13 Au/Jen winding

14 spring legs

15 Retaining spring

16 Recess

17 Locking opening 18 Retaining spring

19 Spring legs

20 spring legs

21 Retaining disc

22 Slot

5 2 3 Locking projection 24 External circumference 2 5 Spring leg 2 6 Spring bend

DRAWING LEGEND

Claims (8)

PATENT ATTORNEY DR.-ING. PETER RIEBLING Dipl.-Ing. EUROPEAN PATENT ATTORNEY Rennerle 10, PO Box 3160 D-8990 Lindau (Bodensee) Telephone (0 83 82) 7 80 25 Fax (0 83 82) 7 80 27 05 G 1918-53-ka 4 May 1993 10 ? Applicant: Otto Ganter & Co. KG, standard parts factory I Triberger Strasse 3, 7743 Furtwangen C-IC Φ _L ~J I1 Protection claims |l 1. Pressure piece with removable threaded pin and lock |& 20 against falling out, characterized in that in a recess (16) of the 1 pressure piece (7) a retaining spring (8,15,18) or a ² retaining disc (21) which centers itself in the recess (16) and has a resilient 25 locking opening (17). Telex: Bank accounts: Postal checking account 5 43 74 (patent-d) Bayer. Vereinsbank Lindau (B) No. 1257 110 (bank code 735 200 74) Munich414848-808 Telegram address: Hyno-Barik Li.idau _V B) Ni. 0670 0268)0(Bank code 73320442) (Bö70&bgr;&idiagr;&Ogr;&Ogr;&bgr;&Ogr;) patri-lindau Voksbank Li, idau (B) No. Z: 22C 000 (bank code ^35 90 ¹ 20) 2. Press piece with threaded pin according to claim 1, characterized in that the retaining spring (8, 15, 18) consists of a round wire or a leaf spring with a rectangular cross-section. 3. Pressure piece with threaded pin according to claim 2, characterized in that the retaining spring (8) in a depression (9) of the pressure piece (7) and has outer windings (13) which rest resiliently and self-centeringly on the inner circumference of the recess (9). 4. Pressure piece with threaded pin according to claim 2, characterized in that the retaining spring (8) is symmetrical and has two inwardly directed spring legs (11, 12) which intersect the recess (16) in the pressure piece (7) approximately tangentially. 5. Pressure piece with threaded pin according to claim 2, characterized in that the retaining spring (15) has an outer free spring leg (14) which rests on the inner circumference of the recess (9), and an outer winding (13), the locking opening (17) being formed between the other, inner spring leg (25) and the opposite spring bend (26). 0 6. Pressure piece with threaded pin according to claim 2, characterized in that the retaining spring (18) is a U-shaped spring part that is held in the recess (9), the opposite spring legs (19, 20) forming the locking opening (17). 7. Pressure piece with threaded pin according to claim 1, characterized in that a retaining disk (21) with its outer circumference (24) rests positively on the inner circumference of the countersink (9) and has radially inwardly directed resilient locking projections (23). 8. Pressure piece with threaded pin according to claim 7, characterized in that the radially inwardly directed resilient locking projections (23) are located between slots (22) formed uniformly on the inner circumference of the retaining disk (21), whereby the locking projections (23) project radially inward beyond the recess (16).