EP4013570A1 - Clamping device - Google Patents

Abstract

The invention relates to a clamping device comprising a clamping member (2), which is movably mounted in a main body (1); a linearly movable actuator (3), which is operatively connected to the clamping member (2); a spring element (4), which is operatively connected to the actuator (3); and a rotatably mounted actuating element (5), which is operatively connected to the spring element (4). According to the invention, the spring element (4) is designed as a compression spring which can be compressed when tensioning by means of the actuating element (5).

Description

Jig

The invention relates to a clamping device according to the upper part of claim 1.

A clamping device of the type mentioned is known from the patent document DE 10 2016 200 180 A1. This consists of a tensioning member movably mounted in a base body, a linearly movable actuator that is operatively connected to the tensioning member, a spring element that is operatively connected to the actuator and a rotatably mounted actuating element that is operatively connected to the spring element. In this solution, the spring element is designed as a tension spring (there reference number 24) because of the grooved plate (there reference number 15-19).

The invention is based on the object of improving a clamping device of the type mentioned at the beginning. In particular, the operational safety of such a tensioning device should be improved in the event of a break in the spring element, which cannot be ruled out in principle.

This object is achieved with a clamping device of the type mentioned at the outset by the features listed in the characterizing part of claim 1 25.

According to the invention, it is provided that the spring element is designed as a compression spring which can be compressed with the actuating element during tensioning. 30th In other words, the solution according to the invention is characterized in that a compression spring is used instead of the tension spring. This has far-reaching consequences and advantages - especially in connection with other training courses - which will be discussed in more detail below. 5

Other advantageous developments of the clamping device according to the invention emerge from the dependent claims.

The tensioning device according to the invention including its advantageous developments according to the dependent claims is explained in more detail below with reference to the drawing of a preferred embodiment.

It shows

FIG. 1 shows in section the clamping device according to the invention in the open position;

FIG. 2 shows, in section, the clamping device according to FIG. 1 on the way into the closed position;

FIG. 3 shows, in section, the clamping device according to FIG. 1 in the closed position with a heavily loaded spring element;

FIG. 4 shows, in section, the tensioning device according to FIG. 1 in the closed position with a lightly loaded spring element;

FIG. 5 shows, in section from the side, the clamping device according to FIG. 4;

FIG. 6 shows, in perspective, the clamping device according to FIG. 1 30 in a first view in the closed position; FIG. 7 shows, in perspective, the clamping device according to FIG. 1 in a second view in the closed position;

FIG. 8, in section, the loaded spring element according to FIG. 4 in a first side view;

FIG. 9 shows in section the loaded spring element according to FIG. 4 5 in a second side view;

FIG. 10 shows a side view of a housing section of the clamping device in which a latching mechanism is arranged;

FIG. 11 shows the housing section receiving the locking mechanism 10 as a transparent representation;

FIG. 12 shows the locking mechanism as an exploded view; and FIG. 13 shows in section the housing section which receives a movement mechanism and the latching mechanism and on which the actuating element is arranged. 15th

The clamping device shown in the figures consists in a known manner of a clamping member 2 movably mounted in a base body 1, a linearly movable actuator 3 operatively connected to the clamping member 2, a spring element 4 operatively connected to the actuator 3 and one to the spring element 4 Actively connected, rotatably mounted actuating element 5, see in particular FIG. 1.

It is preferably provided that the clamping member 2 is designed as 25 clamping hooks and a counter bearing 13 is provided on the base body 1 for this clamping hook. It is also preferred that a centering mandrel 16 is provided on the base body 1 and the clamping member 2 is arranged at least partially in this centering mandrel 16. 30th It is now essential for the tensioning device according to the invention that the spring element 4 is designed as a compression spring which can be compressed with the actuating element 5 during tensioning.

In addition, it is preferred that the tensioning member 2 is arranged pivotably and 5 displaceably in the base body 1. It is also preferred that a guide slot 14 is provided on the end of the tensioning member 2 on the actuator side and a pin 15 engaging in the guide slot 14 on the end of the actuator 3 on the tendon side. In addition, a curved guide 17 is preferably provided on the clamping member 210 and a guide pin 18 engaging in the curved guide 17 is provided on the base body 1, see in particular FIG. 2 in this regard.

Provision is also preferably made for an abutment element 6 for the spring element 4 to be arranged on the end of the actuator 3 facing away from the clamping element 2. The spring element 4 is preferably designed as a helical compression spring. The abutment element 6 is preferably designed in the shape of a plate. In addition, it is preferred that the actuator 3 is arranged centrally and the spring element 4 is arranged concentrically to the actuator 3 on the abutment element 6. The spring element 4 is preferably designed to be supported on the one hand on the actuator 3 and on the other hand on an abutment 7 that is operatively connected to the actuating element 5. Furthermore, it is preferred that the abutment 7 is arranged at one end of a preferably cup-shaped housing 8 and the actuating element 5 is operatively connected to the other end of the housing 8. It is also preferred that the abutment 7 is designed like a cover for the preferably cup-shaped housing 8, with a through hole 19 for the actuator 3 being provided on the cover. In addition, it is preferred that the The bearing element 6 for forming a damper is designed to be mounted in the housing 8 in the manner of a piston and / or that the housing 8 is designed to be displaceably mounted in the base body 1.

Furthermore, it is preferred that a channel 9 is arranged on the abutment element 6, which is otherwise sealed in the housing 8, see in particular Figure 8. In addition, a check valve 10 is preferably arranged on the abutment element 6, which is otherwise sealed in the housing 8 apart from the channel 9 , see in particular FIG. 9. In addition, both the channel 9 and the check valve 10 are preferably provided for the fluidic connection of two spaces 8.1, 8.2 arranged on both sides of the abutment element 6. The housing 8, in particular the spaces 8.1, 8.2, is preferably filled 15 with a damping medium, preferably oil. It is preferred here that the channel 9 has dimensions that prevent rapid expansion of the spring element 4 and / or that the check valve 10 is permeable in the event of a movement of the abutment element 6 relative to the abutment 7 leading to compression of the spring element 4 and to an expansion in the event of a movement of the spring element 4 leading movement of the abutment element 6 relative to the abutment 7 is sealing.

Furthermore, a rotating shaft 11 rotatably mounted on the base body 1 is preferably provided for the rotatable mounting of the actuating element 5. It is also preferred that a lever arm 20 is arranged on the rotary shaft 11. It is also preferred that an intermediate member 21 is articulated on the lever arm 20. The intermediate member 21 is preferably designed in an articulated manner 30 connected to the housing 8. The rotating shaft 11, the The lever arm 20 and the intermediate member 21 preferably form a movement mechanism 23 (see FIG. 13).

It is also preferred that the intermediate member 21 is U-shaped and encompasses the rotary shaft 11 in the clamping position. 5 Likewise, the intermediate member 21 is preferably designed as part of a toggle lever device.

In addition, a latching mechanism 12 holding the clamping device in the open position 10 is preferably provided on the rotary shaft 11 mounted in the housing section 1.1. It is preferred that the locking mechanism 12 consists of a plate 12.1 attached to the base body 1 with a locking projection 12.2, a ball 12.3 cooperating with the locking projection 12.2, a bearing plate 12.4 for the ball 12.3, which is displaceably but non-rotatably connected to the rotary shaft 11, and a Ball 12.3 is formed against the plate 12.1 pressing spring device. Whereby it is further preferred that the spring device is formed from at least one plate spring 12.5, see in particular FIGS. 10 to 13. As can be seen for a person skilled in the art from the present technical framework, at least one latching projection 12.2 and at least one ball 12.3 be provided. Preferably, however, two or particularly preferably even three latching projections 12.2 or balls 12.3 are provided distributed over the circumference.

Finally, an end position interrogation device 22, which interacts with the actuator 3 and preferably operates inductively, is preferably arranged on the base body 1. 30th The clamping device according to the invention according to the embodiment shown in the figures works as follows:

Initially, the clamping device is in an open position (see Figure 1). The clamping member 2 is arranged completely in the centering mandrel 16 and the lever arm 20 is in an upper or lateral position. In this state, the clamping device is kept open, since the ball 12.3 of the locking mechanism 12 is blocked by the locking projection 12.2. An undesired independent movement of the actuating element 5 and thus an adjustment of the intermediate member 21 is thus excluded.

In order to bring the clamping device into the clamping position, the lever arm 20 is now rotated downwards with the aid of the actuating element 5 and thus the ball 12.3 moves past the locking projection 12.2 against the resistance thereof. This has the consequence that the housing 8 in the base body 1 is pulled downwards with the aid of the intermediate member 21, the actuator 3 being moved downwards with it. The downward movement of the actuator 3 now causes, via the coupling of the actuator 3 to the clamping element 2 via the guide slot 14 and the pin 15, also a downward movement of the clamping element 2, which simultaneously with a pivoting movement of the clamping element 2, caused by the running of the guide pin 18 in the curve 25 guide 17 takes place. The superposition of these two movements now has the effect that the clamping member 2 emerges from the centering mandrel 16, moves in the direction of the counter bearing 13 and in the process clamps a workpiece placed there. Since the lever arm 20 and the intermediate member 21 are designed as part of a toggle lever device (movement mechanism 23) and their toggle levers are in the clamping position of the clamping device in a Is located above dead center, it is ensured that the clamping position cannot come loose by itself. This, together with the aforementioned locking mechanism 12, enables particularly safe operation of the clamping device.

5

If the tendon 2 reaches the workpiece, it cannot be pulled down any further. The same then also applies to the actuator 3 connected to the tensioning member 2 and the abutment element 6 connected to it. The housing 8 with the abutment 7 can, however, be lowered a little further when the lever arm 20, 10 is moved. Since the spring element 4 is positioned between the abutment element 6 and the abutment 7, this has the effect that the spring element 4 is compressed (compare FIGS. 2 and 3). The resulting spring force counteracts an undesired opening of the clamping device and thus makes the clamping device more reliable. This also ensures that the tensioned position is maintained even if the spring element 4 breaks. Furthermore, the previously described filling of the spaces 8.1 and 8.2 of the housing 8 with a damping medium 20 has a safety-promoting effect, since this weakens or prevents abrupt movements of the actuator 3 or, in particular, of the actuating element 5 arranged on the outside of the clamping device.

25th

The spring force exerted by the spring element 4 is greater when clamping thicker workpieces than with thinner ones, since the spring element 4 is compressed more strongly here (compare FIGS. 3 and 4). The flexible compression of the spring element 4 allows (which is very advantageous) a certain tolerance equal to 30 in the thickness of the workpiece while still having sufficient clamping force for very thin workpieces. Another advantage of the tensioning device according to the invention is that by using a compression spring as the spring element 4, with the same (high) tensioning force, a smaller installation space is required for the spring element than in comparable designs with a tension spring.

List of reference symbols

1 basic body

1.1 Housing section

2 tendons

3 actuator

4 spring element

5 actuator

6 abutment element

7 abutments

8 housing

8.1 space

8.2 space

9 channel

10 check valve

11 rotating shaft

12 locking mechanism

12.1 plate

12.2 locking projection

12.3 bullet

12.4 bearing plate

12.5 disc spring

13 counter bearings

14 guide slot

15 tenons

16 centering pin

17 cornering

18 guide pins

19 through hole Lever arm intermediate link interrogation device movement mechanism

Claims

Claims 1. Clamping device, comprising a movable clamping member (2) mounted in a base body (1), a linearly movable actuator (3) operatively connected to the clamping member (2), a spring element (4) operatively connected to the actuator (3) and a spring element (4) the spring element (4) operatively connected, rotatably mounted actuating element (5), characterized in that the spring element (4) is designed as a compression spring compressible with the actuating element (5) during tensioning. 2. Clamping device according to claim 1, characterized in that an abutment element (6) for the spring element (4) is arranged on the clamping element (2) facing away from the end of the actuator (3). 3. Clamping device according to claim 1 or 2, characterized in that the spring element (4) is supported on the one hand on the actuator (3) and on the other hand on an abutment (7) operatively connected to the actuating element (5). 4. Clamping device according to claim 3, characterized in that the abutment (7) is arranged at one end of a housing (8) and the actuating element (5) is operatively connected to the other end of the housing (8). 5. Clamping device according to claim 4, characterized in that the abutment element (6) is designed to form a damper in the manner of a piston in the housing (8). 6. Clamping device according to claim 4 or 5, characterized in that the housing (8) is designed to be displaceably mounted in the base body (1). 7. Clamping device according to 5 or 6, characterized in that a channel (9) is arranged on the abutment element (6) which is otherwise sealed in the housing (8). 8. Clamping device according to claim 7, characterized in that, apart from the channel (9), a check valve (10) is arranged on the abutment element (6) guided in a sealed manner in the housing (8). 9. Clamping device according to claim 8, characterized in that the check valve (10) is permeable in the event of a movement of the abutment element (6) leading to a compression of the spring element (4) and in a movement of the abutment element (4) leading to an expansion of the spring element (4) 6) is designed to be sealing. 10. Clamping device according to one of claims 1 to 9, wherein for the rotatable mounting of the actuating element (5) a rotatably mounted on the base body (1) rotating shaft (11) is provided, characterized in that the clamping device is in the open position on the rotating shaft (11) holding latching mechanism (12) is provided.