DE10317346B4 - Bracket system for a carrier plate in quick release cylinders - Google Patents

Abstract

Mounting system of a carrier plate (1, 20), which is fastened to a machine table by means of quick-action clamping cylinders (19), the workpieces to be machined being arranged on the carrier plate (1, 20) by means of clamping tools and the carrier plate (1, 20) on its underside Row of retractable nipples (2, 6, 16), which engage for clamping in the receiving openings (22) of several quick-action clamping cylinders (19) arranged on the machine table, with a single adjusting clamping point free of play to compensate for thermal expansion of the carrier plate (1, 20) and is designed to be fixed, while the remaining clamping points allow the support plate (1, 20) to expand at least in the radial direction, all of the retractable nipples (2, 6, 16) being fixed to the support plate (1, 20) free of play and pretensioned, wherein each retractable nipple (2, 6, 16) forms an inlet collar (39) directed in the axial direction, which in the central recess of the quick release ylinders (19), and in each case in the area of the inlet collar (39) at least two spaced-apart pull-in nipples (2, 6, 16) form a peripheral edge which is free over part of its circumference and a leading edge over another part ( 11) for centering the retractable nipple (2, 6, 16) in the area of the central recess on the quick-release cylinder (19), characterized in that at least one retractable nipple (2, 6, 16) in the area of the centering guide edge (11) on the Retractable nipple (2, 6, 16), a blow-out groove (14) is arranged, via which blow-out air keeps the guide edge (11) free of dirt.

Description

The invention relates to a mounting system of a carrier plate which is fastened to a machine table by means of quick release cylinders. In a manner known per se, the workpieces to be machined are arranged on the carrier plate by means of clamping tools, and the carrier plate carries on its underside a series of retractable nipples which engage in the receiving openings of several quick-action clamping cylinders arranged on the machine table and are clamped there, in accordance with the preamble of Claim 1.

The one that goes back to the same inventor DE 197 05 688 C2 deals with the problem that in order to compensate for thermal expansion of the processing pallet, a single setting clamping point should be designed to be free of play and fixed, while the other clamping points should allow the processing pallet to be expanded at least in the radial direction. This particular measure was intended to make it easier to place the carrier plate on the receiving openings of the quick-action clamping cylinders embedded in the machine table. The disadvantage, however, is that floating storage of individual retractable nipples in the machining pallet is difficult to manufacture and, if the machining pallet is used several times, the seats between the retractable nipples and the surface of the machining pallet are ground down. This connection is therefore unsafe and subject to wear.

The DE 197 05 687 A1 discloses a mounting system of a carrier plate according to the preamble of claim 1.

The present invention has for its object to enable a secure centering of a nipple in the central receiving opening of the quick release cylinder.

This object is achieved by a mounting system according to claim 1.

In the mounting system of a carrier plate according to the invention in quick-action clamping cylinders arranged on the machine table, floating attachment of retractable nipples to the carrier plate can be dispensed with, nevertheless, despite thermal expansion or despite inaccurately positioned retracting nipples, the carrier plate is perfectly accommodated in the quick-action cylinders.

With the given technical teaching, the advantage is achieved that all of the retractable nipples arranged on the support plate can now be firmly pretensioned and that only the engagement of the respective retractable nipples in the central recess of the respectively assigned quick-release cylinder is either subject to play as required , completely free or with a guide edge.

For this purpose, the invention proposes a number of different retractable nipples.

A first type of retractable nipple is referred to as a "multi-radius nipple", whereby only a single multi-radius nipple is to be arranged on a carrier plate because the zero point is removed from it and all reference dimensions relate to this one multi-radius nipple.

It is characteristic of this multi-wheel nipple that it defines several (more than two) guide edges on its outer circumference (for example 3, 4 or more), these guide edges forming a certain play with the respective associated peripheral edge in the central receiving opening of the quick-action clamping cylinder.

Such guide edges are therefore only present in parts on the circumference and outside of these guide edges there are circumferential edges which are free on the circumference and which form a substantially greater play with the circumferential edge of the central recess in quick-action clamping cylinders.

According to the invention, when the multi-radius nipple is retracted into the associated central recess on the quick-release cylinder, the multi-radius nipple is automatically centered in the central receiving opening, because the guide edges, depending on the selected play, center in the central recess only with respect to the guide edge that is present in pieces while the remaining parts between the guide edges have a lot of play. Thus, only short, track-shaped sections with little play, which are distributed around the circumference, are defined as guide edges, while the intermediate sections are defined as free peripheral edges.

It has been found that the multi-radius nipple, in conjunction with the other nipples to be described later, enables the support plate to play in the assigned, stationary quick-release cylinders, which is practical. Practice has shown that the individual nipples arranged on the underside of the carrier plate cannot be positioned with the required accuracy in order to ensure when placing the carrier plate that all nipples engage securely and securely in the associated receiving openings on the opposing quick release cylinders. For this reason, the invention proposed that only the one multi-radius nipple with its circumferentially arranged at least three guide edges is automatically centered in the receiving opening of the associated quick release cylinder, while all other nipples allow a certain amount of play when these nipples engage in the receiving opening.

In practice, it has been found that the centering of the individual nipples in the associated receiving openings of the stationary quick-release cylinders is already impaired when fine-grained cast dust adheres to the surface of the retractable nipples and this cast dust already complicates the insertion of the retractable nipples into the assigned quick-release cylinders , For this reason alone, it is expedient to enable only one nipple (the multi-radius nipple) to be centered in the receiving opening of the associated quick-release cylinder, while the other nipples are either completely free (these are referred to below as pull-in nipples because they are only pull-in tasks and Take over holding tasks) while the other type of nipples are referred to as "drive nipples" because they only allow centering in a certain direction, while in the other, perpendicularly arranged direction, an engagement play in the associated receiving opening on the quick-release cylinder is guaranteed.

It is important in the case of the nipples formed with guide edges (namely the multi-radius nipple and the drive nipple) that the guide edge with a larger radius is only present in parts, while the adjacent peripheral edges remote from the guide edge have a smaller radius from the center and therefore allow that can also fix chips in these areas without impairing the centering of this nipple in the area of the central receiving opening of the quick-action clamping cylinder.

In the case of the present invention, a blow-out point is also arranged in the region of the guide edge which has only a slight play with respect to the central receiving opening. This prevents cast chips or machining residues from becoming lodged in this sensitive area and impairing the centering of the nipple in the central receiving opening of the quick-action clamping cylinder.

By arranging an air-guiding blow-out groove in the area of the peripheral edge, the effective area of this guide edge is reduced even further. In this way, the centering becomes less sensitive because, on the one hand, the air is blown out over a relatively large area in the guide edge and the guide edge is thus kept free of residues, and on the other hand the area of the guide edge necessary for centering is reduced, which makes centering easier overall.

Special advantages result from the special mounting of the carrier plate in the machine-fast quick release cylinders when it comes to automatic processing systems. With automatic machining systems of this type, it is no longer possible to visually check whether the retractable nipples are clean and free of residues, because several processing sequences connected in series (removal of the carrier plate from quick-release cylinders, reclamping and reinserting) take place in succession.

It also happens that such carrier plates are transported from machine to machine, and each time the carrier plate is unclamped into the associated machine-specific quick-release cylinders, it must be ensured that the individual retractable nipples arranged on the underside of the carrier plate are securely and firmly inserted and clamped in the assigned quick-release cylinders can be.

In the prior art, this was often not possible because with the previously known retractable nipples the central receiving opening in the quick-action clamping cylinder could not be hit sufficiently securely, so that it was no longer possible at all to lock the retractable nipple into the quick-action clamping cylinder during certain machining operations. Here, the invention provides considerable improvement.

In the following, the invention will be explained in more detail with reference to drawings showing only one embodiment. Here, from the drawings and their description, further features and advantages of the invention that are essential to the invention emerge.

• 1: Eine Draufsicht auf eine runde Trägerplatte mit einer Anzahl von Einzugsnippeln;
• 2: die Draufsicht auf die Stirnseite eines Mehrradien-Nippels;
• 3: die Draufsicht auf die Stirnseite eines Antriebsnippels;
• 4: die Draufsicht auf eine rechteckig geformte Trägerplatte;
• 5: die Draufsicht auf einen Mehrradien-Nippel;
• 6: die Draufsicht auf einen Zugnippel;
• 7: die Draufsicht auf einen Antriebsnippel;
• 8: Schnitt durch die Aufspannung einer Trägerplatte auf einen Schnellspannzylinder;
• 9: Schnitt durch eine Trägerplatte mit daran befestigtem Fang-Einzugsnippel;
• 10: ein um 90° versetzter Schnitt nach 9 durch eine abgewandelte Ausführungsform eines Fang-Nippels;
• 11: ein Detail der Darstellung aus 10;
• 12: eine gleiche Darstellung wie 10;
• 13: die Draufsicht auf eine weitere Ausführungsform eines Mehrradien-Nippels;
• 14: eine gegenüber den Nippelformen in 9, 10 und 12 abgewandelte Ausführung eines Fang-Nippels;
• 15: ein Detail des Umfangrandes der Ausführung nach 13;
• 16: schematisiert den Eingriff eines Fang-Nippels in die zentrale Ausnehmung am Zylinderdeckels eines Schnellspannzylinders.

Show it:

• 1 : A top view of a round carrier plate with a number of retractable nipples;
• 2 : the top view of the end face of a multi-radius nipple;
• 3 : the top view of the end face of a drive nipple;
• 4 : the top view of a rectangular shaped support plate;
• 5 : the top view of a multi-radius nipple;
• 6 : the top view of a nipple;
• 7 : the top view of a drive nipple;
• 8th : Section through the clamping of a carrier plate on a quick release cylinder;
• 9 : Section through a carrier plate with catch catch nipple attached;
• 10 : a cut offset by 90 ° 9 by a modified embodiment of a catch nipple;
• 11 : a detail of the representation 10 ;
• 12 : same representation as 10 ;
• 13 : the top view of a further embodiment of a multi-radius nipple;
• 14 : one compared to the nipple shapes in 9 . 10 and 12 modified version of a catching nipple;
• 15 : a detail of the peripheral edge according to the execution 13 ;
• 16 : schematically shows the engagement of a safety nipple in the central recess on the cylinder cover of a quick release cylinder.

According to 1 are on a carrier plate 1 a number of different nipples arranged.

In the middle of the carrier plate 1 is a so-called multi-radius nipple 2 arranged the in 2 is shown in more detail.

At a distance from this multi-radius nipple 2 At least one further nipple is arranged, which has a certain play in an arrow direction 3 in its inclusion in the cylinder cover 37 a quick release cylinder 19 allowed.

The 1 shows that several such drive nipples 6 at a mutual distance from each other on the carrier plate 1 can be arranged distributed in grid dimensions, depending on their orientation, a game in the arrow directions 3 or 4 in the assigned receiving opening in the cylinder cover 37 is made possible.

The 2 shows further details of the multi-radius nipple 2 , This multi-radius nipple (compare also 8th ) has a central central hole 7 on, which can also be designed here as a threaded bore. Around the hole 7 the nipple forms around 2 a neck 8th with which he according 8th in an assigned blind hole 23 on the underside of the carrier plate 1 . 20 is let in.

The important thing is that the circumference of the neck 8th a press fit 24 in the blind hole 23 results in each of the nipples described below 2 . 6 . 16 with this press fit 24 in the assigned blind hole 23 with its respective neck 8th is recorded.

It is now important that the multi-radius nipple extends axially downwards and out of the blind hole 23 outstanding inlet collar with an enlarged diameter 39 which has a catch area for the entry of the nipple into the associated central recess 21 in the cylinder cover 37 formed.

According to 8th is the said nipple 2 otherwise firm and immovable with a waistband 9 enlarged diameter on the underside of the surface of the carrier plate 1 . 20 on.

Regarding this axially downwardly extended inlet collar 39 now shows the 2 that the peripheral edge of this infeed collar 39 is designed differently. There are four guide edges evenly distributed around the circumference 11 arranged enlarged radius, these peripheral edges 11 are only distributed over a small distance of the circumference. Set back from these leading edges 11 are, however, a peripheral edge over longer distances 10 defined between the leading edges 11 is formed and these guide edges are behind the guide edges with a reduced radius from the center 11 set back. This leads to a presentation 16 where it can be seen that the leading edges 11 with little play in the central opening 22 in the area of the recess 21 of the quick release cylinder 19 intervention. Out 16 is recognizable that the exception opening 22 has the same radius all around and that the piece-by-piece guide edges are now located on the inside of this receiving opening with little play 11 create, and that outside of these leadership margins 11 the circumference of the multi-radius nipple 2 is set back, and this is in the area of the free peripheral edges 10 an annular gap 38 results.

The centering function of the multi-radius nipple 2 in the receiving opening 22 is thus due to only four guide edges which are present piece by piece and are evenly distributed over the circumference 11 accomplished.

The 13 shows in addition to variation 16 that instead of four evenly distributed guide edges on the circumference, there may also be three that perform the same centering function.

Instead of three or four existing guide edges, it is of course also possible to provide more, for example 5, 6 or 7 guide edges arranged distributed around the circumference. For the rest, it does not depend on the uniform distribution on the circumference, it can also be provided, for example, that with three circumferential edges they are in the Angles of, for example, 100 ° to 100 ° to 160 ° can be arranged.

The same applies to any other number of guide edges, which can also be arranged unevenly distributed around the circumference in the manner described above.

Advantage of the arrangement of several guide edges evenly distributed around the circumference 11 is that the multi-radius nipple 2 then practically evenly in the central receiving opening 22 in the cylinder cover 37 is centered during the in 3 shown drive nipple 6 a certain game, for example in the direction of the arrow 4 , can be assigned. It can be seen here that the guide edges mentioned only exist at two opposite points 11 are present and that the remaining peripheral margin 12 is free and set back in the radius, so that it extends over the area of the entire peripheral edge 12 the previously mentioned annular gap 38 towards the circumferential central receiving opening 22 of the quick release cylinder results.

This also means that when such a drive nipple is retracted 6 into the central opening 22 this drive nipple 6 regardless of its exact positioning on the carrier plate together with the carrier plate in the direction of the arrow 4 can be moved.

So there is no displacement on the carrier plate, but a displacement in the drive nipple 6 receiving quick release cylinder 19 ,

4 shows as a further embodiment that the invention is not limited to a round support plate, but that the type of nipples described 2 . 6 also on any shaped support plates, for example a rectangular support plate 20 can be arranged.

Because the previously described nipples 2 . 6 a centering function in the associated receiving opening 22 on the quick release cylinder 19 have, they are also described in the general part as a catch-nipple.

In addition to the mentioned catch nipples 2 . 6 can still add more nipples 16 be available that allow a game in all directions, as well as in the direction of the arrow 17 at 6 is specified.

These nipples 16 therefore only have pull functions on the carrier plate 1 . 20 and also allow when inserted into the central receiving opening 22 on the quick release cylinder 19 a game in all directions 17 ,

The lever should be from the multi-radius nipple 2 starting from the other drive nipple used for centering 6 as far away from the multi-radius nipple 2 Arrange. In between, the described nipples can be of any type and distribution 16 with free play in all directions.

The 5 . 6 . 7 show three different embodiments of the retractable nipple in plan view, depending on their use. 5 shows a multi-radius nipple, 6 shows a Zugnippel16 and 7 shows a drive nipple 6 , The multi-radius nipple 2 and the drive nipple 6 have a similar vertical cross-section, with a tip that serves to facilitate insertion. The nipple 16 lacks such a leading tip.

The 8th shows the attachment of the catch retractable nipples previously described 2 . 6 on a carrier plate 1 . 20 , It is shown that in the central hole 7 a grub screw 18 is screwed in, and the neck described above 8th over its axial length in the assigned blind hole 23 on the underside of the carrier plate 1 . 20 is recorded. The circumference of the neck 8th forms the press fit previously described 24 on the inner circumference of the material bore 23 ,

A horizontal investment area now arises in the federal area 9 which extends in diameter to the underside of the carrier plate 1 . 20 invests.

In the axial extension of the neck 8th and an inlet collar enlarged in diameter extends approximately parallel to this 39 down, in the area of the previously described circumferential and guide edges 10 . 11 . 12 are arranged.

As already mentioned in the general description section, it is useful in the area of the centering guide edge 11 also a blow-out groove 14 to arrange, over which the blow-out air the guide edge 11 keeps it free of dirt.

As an example is in 8th shown that through the air intake 25 the compressed air via an inclined duct 27 is guided into an upwardly directed blow-out mouth, which blow-out mouth obliquely against the underside of the carrier plate 1 . 20 is directed.

Branch from this sloping channel 27 this flows into the circumferential ring channel in an air-tight manner 26 , in which also the catch balls of the quick release cylinder 19 are arranged. This ring channel 26 is therefore permeated by air and this inclined channel opens via an air-tight connection 26 in an inclined upward ascending channel 28 , which in turn cross channels branching horizontally from it 29 transforms.

Every cross channel 29 thus ends in an assigned guide edge 11 and there forms a blow-out groove widened in the axial direction 14 out, as well as this in 10 is shown.

The 9 to 16 show, moreover, various embodiments of nipples and partial views thereof, both as safety nipples, 2 . 6 as well as a nipple 16 can be formed in the manner described below.

The 9 shows, for example, that the nipple in the central hole has a catch screw 30 can wear, which reaches out with her head from the lower opening of the nipple and there an additional inlet slope 31 forms an even better centering of the nipple 2 . 6 . 16 in the assigned recess in the cylinder cover 37 to enable.

On the other hand, they show 10 and 12 an integral nipple 2 . 6 . 16 that has a run-in slope 32 trained directly on the nipple itself and not on a catch screw 30 ,

The 14 shows that the nipple can also be approximately trapezoidal, the lower receiving opening 34 In a manner known per se, a countersunk screw engages through the central bore 7 reaches through and into a threaded hole in the area of the support plate 1 . 20 is screwed in.

The 13 shows compared to 16 that it is quite sufficient, also three leading edges 11 to be distributed around the circumference, which is the centering task for the multi-radius nipple 16 take over, which then set back, longer and free peripheral edges 33 result, which then have a correspondingly longer annular gap 38 in connection with the opposite receiving opening 22 form.

LIST OF REFERENCE NUMBERS

1

Carrier plate (round)

2

More radii nipple

3

arrow

4

Arrow direction

6

drive nipple

7

drilling

8th

neck

9

Federation

10

Perimeter (optional)

11

leading edge

12

Perimeter (optional)

14

blow-out

15

arrow

16

cable head

17

arrow

18

Set screw

19

Quick clamping cylinder

20

Carrier plate (square)

21

recess

22

receiving opening

23

blind hole

24

press fit

25

air intake

26

annular channel

27

oblique channel

28

rising channel

29

Querkanal

30

capture screw

31

run-in slope

32

run-in slope

33

periphery

34

receiving opening

37

cylinder cover

38

annular gap

39

inlet collar

Claims (22)

Mounting system of a carrier plate (1, 20), which is fastened to a machine table by means of quick-action clamping cylinders (19), the workpieces to be machined being arranged on the carrier plate (1, 20) by means of clamping tools and the carrier plate (1, 20) on its underside Row of retractable nipples (2, 6, 16), which engage for clamping in the receiving openings (22) of several quick-action clamping cylinders (19) arranged on the machine table, with a single adjusting clamping point free of play to compensate for thermal expansion of the carrier plate (1, 20) and is designed to be fixed, while the remaining clamping points allow the support plate (1, 20) to expand at least in the radial direction, all of the retractable nipples (2, 6, 16) being fixed and free of play and pretensioned on the Carrier plate (1, 20) are fastened, each retractable nipple (2, 6, 16) forming an axially directed inlet collar (39) which engages in the central recess of the quick release cylinder (19), and in each case in the area of the inlet collar ( 39) at least two spaced-apart pull-in nipples (2, 6, 16) form a peripheral edge which is free over part of its circumference and a further part has a guide edge (11) for centering the pull-in nipple (2, 6, 16) in Area of the central recess on the quick release cylinder (19), characterized in that in at least one retractable nipple (2, 6, 16) in the region of the centering guide edge (11) on the retractable nipple (2, 6, 16) a blowout groove (14) is arranged is, via which a blow-out air keeps the guide edge (11) free of dirt. Bracket system according to a carrier plate Claim 1 , characterized in that the retractable nipples (2, 6, 16) fulfill different functions and / or modes of action when fixing the carrier plate (1, 20). Bracket system according to a carrier plate Claim 1 or 2 , characterized in that a multi-radius nipple (2) is responsible for the central fixation and zero point alignment of the carrier plate (1, 20) by being fixed in each direction during and after the fixation by the quick-action clamping cylinder (39) with respect to the machining coordinate system. Bracket system according to a carrier plate Claim 3 , characterized in that the multi-radius nipple (2) has a central central bore (7), which can also be designed as a threaded bore, with a neck (8) is formed around the bore (7) with which it is in a assigned blind hole (23) on the underside of the carrier plate (1, 20). Bracket system according to a carrier plate Claim 4 , characterized in that there is a press fit (24) in the blind bore (23) on the circumference of the neck (8), so that the multi-radius nipple (2) with this press fit (24) in the associated blind bore (23) with its respective neck (8) is added. Bracket system of a carrier plate according to one of the Claims 4 or 5 , characterized in that the multi-radius nipple (2) has an inlet collar (39) which is axially extended downward and protrudes from the blind bore (23) and has an enlarged diameter, which has a catch area for the inlet of the nipple into the associated central recess (21 ) in the cylinder cover (37). Bracket system of a carrier plate according to one of the Claims 3 to 6 , characterized in that the multi-radius nipple (2) rests firmly and immovably with its collar (9) of enlarged diameter on the underside of the surface of the carrier plate (1, 20). Bracket system of a carrier plate according to one of the Claims 3 to 7 , characterized in that the guide edges (11) of the multi-radius nipple (2) engage with little play in the central receiving opening (22) in the region of the recess (21) of the quick release cylinder (19). Bracket system of a carrier plate according to one of the Claims 3 to 8th , characterized in that the receiving opening (22) has the same radius all round, that the piece-by-piece guide edges (11) are applied to the inside of this receiving opening (22) with little play and that outside of these guide edges (11) the circumference of the multiple radii -Nipples (2) is set back and this results in an annular gap (38) in the area of the free peripheral edges (10). Bracket system of a carrier plate according to one of the Claims 3 to 9 , characterized in that the centering function of the multi-radius nipple (2) in the receiving opening (22) is accomplished by at least three guide edges (11) which are provided in pieces and distributed around the circumference. Bracket system of a carrier plate according to one of the Claims 1 to 10 , characterized in that at least one drive nipple (6) is provided for the further fixing of the carrier plate (1, 20), this allowing a temperature-related offset when fixing in a coordinate direction of the machining system. Bracket system according to a carrier plate Claim 11 , characterized in that when the drive nipple (6) is moved into the central receiving opening (22), this drive nipple (6), regardless of its exact positioning on the carrier plate (1), together with the carrier plate (1) in one direction (4) of the machining coordinate system can be moved. Bracket system of a carrier plate according to one of the Claims 11 or 12 , characterized in that due to the heat-related expansion of the carrier plate (1) there is no displacement on the carrier plate (1), but rather a displacement in the quick-action clamping cylinder (19) receiving the drive nipple (6). Bracket system of a carrier plate according to the Claims 3 and 11 , characterized in that the multi-radius nipple (2) and the drive nipple (6) have a centering function in the associated receiving opening (22) on the quick release cylinder (19). Bracket system of a carrier plate according to one of the Claims 1 to 14 , characterized in that at least one pulling nipple (16) is provided for the further fixing of the carrier plate (1, 20), this allowing a temperature-related offset when fixing in two coordinate directions of the processing system. Bracket system according to a carrier plate Claim 15 , characterized in that the pulling nipple (16) only has pulling functions on the carrier plate (1, 20) and, when inserted into the central receiving opening (22) on the quick-action clamping cylinder (19), enables play in all coordinate directions (17). Bracket system of a carrier plate according to one of the Claims 1 to 16 , characterized in that a set screw (18) is screwed into a central bore (7) of a pull-in nipple (2, 6, 16) and a neck (8) formed around the bore (7) over its axial length in an associated blind bore (23) is received on the underside of the carrier plate (1, 20), the periphery of the neck (8) forming a press fit (24) on the inner periphery of the blind bore (23). Bracket system of a carrier plate according to one of the Claims 1 to 17 , characterized in that, via an air inlet (25), compressed air is guided via an inclined channel (27) into an upwardly directed blow-out mouth, which blow-out mouth is directed obliquely against the underside of the carrier plate (1, 20). Bracket system according to a carrier plate Claim 18 , characterized in that branching off from the oblique channel (27) the blow-out mouth opens air-tightly into a circumferential ring channel (26) in which catch balls of the quick-action clamping cylinder (19) are also arranged. Bracket system according to a carrier plate Claim 19 characterized in that the annular channel (26) is penetrated by air and via an air-tight connection the oblique channel (27) opens into an obliquely upward rising channel (28) which in turn merges into transverse channels (29) branching horizontally therefrom. Bracket system according to a carrier plate Claim 20 , characterized in that each transverse channel (29) opens into an associated guide edge (11) and forms a blow-out groove (14) which is widened in the axial direction. Bracket system of a carrier plate according to one of the Claims 1 to 21 , characterized in that one of the retractable nipples (2, 6, 16) can carry a catch screw (30) in a central bore (7), the head of which grips out of the lower opening of the relevant nipple and there provides an additional entry slope (31) trained to enable improved centering of the nipples (2, 6, 16) in the associated recess in the cylinder cover (37).

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