DE29612564U1 - Clamping device for the detachable connection of two profile pieces - Google Patents

Description

CS82/et

SYMA Intercontinental AG CH-9533 Kirchberg

Clamping device for detachably connecting two profile pieces

The present invention relates to a clamping device for releasably connecting two profile pieces according to the preamble of claim 1.

A clamping device known from CH-A-576 591 is used to connect frames and/or walls made up of profile pieces. For this purpose, a longitudinally displaceable bolt is provided which is guided in an insert core and which is T-shaped at its head end in order to engage behind a slot in another profile piece. The longitudinal displacement of the bolt is achieved by the conical tip of the screw cooperating eccentrically with a conical recess in the bolt which serves as a tightening surface.

Another clamping device of this type is known from EB-O 506 607. In this clamping device, the bolt has support means for pivotably supporting several holding pieces, whereby each holding piece and the inner walls of the insert core comprise a system of sliding surfaces in order to cause the holding pieces to pivot when the bolt moves axially. The holding pieces each have a nose on their free end areas in order to exert the desired clamping pressure when pivoting.

Another clamping device of this type is known from EP-PS-0 123 683. In this clamping device, the anchor bolt is secured by being extended by a rod with an extended end part and by the insert core being provided with spreading fingers and having inwardly projecting cams in order to grip behind the extended end part. Such a snap lock can also be implemented by an integrally formed sleeve with at least one longitudinal slot in which a pin arranged diagonally in the rod is guided.

Furthermore, FR-PS-2.152.941 describes a device with holding elements that are mounted so they can rotate around an axis that is fixed in the housing. This device has no bolt or screw that engages the bolt via sliding surfaces, but rather the holding elements are pivoted by an eccentric whose length corresponds to the width of the housing. The housing has no sliding surfaces.

chen which cause the pivoting of the holding elements when they move axially, but the sliding surfaces are located in the eccentric and in the lower area of the holding elements or a pressure piece which moves the holding elements.

It is now the object of the present invention to create an improved clamping device of the type mentioned at the beginning.

This object is achieved according to the invention by a clamping device with the features specified in the characterizing part of claim 1.

Further advantageous embodiments of the invention are specified in the dependent claims.

The invention is explained in more detail below using a drawing, for example.

Figure 1 is a side view of an inventive

clamping device according to the invention with insert core and a first profile piece in the open state,

Figure 2 is a plan view of a part of a

inventive bolt with fixing bushing and eccentric in the open state,

Figures 3 and 6 show a cross-sectional view of the slide section of this bolt,

Figure 4

a side view of this clamping device in the closed position,

Figure 5

a plan view of a part of this bolt in the closed state,

Figures 7, 8, 9 Representations of the bolt from the side, from

above and in cross section,

Figures 10, 11 Representations of the fixing bushing from above

and sideways,

Figures 12, 13 Side views of an eccentric

and from above,

Figures 14, 15 a variant of an eccentric with a

additional elongated mandrel,

Figures 16, 17 a detail of such a clamping device to explain the operation of such a mandrel,

Figures 18, 19 another variant of an eccentric

with a spiral wall,

• ■ »»· ·♦·

Figures 20, 21, 22 schematic representations of the bolt

and the fixing bush to explain the operation of the eccentric according to this variant,

Figures 23, 24, 25 show a further embodiment of an inventive

clamping device according to the invention with a continuous eccentric roller, in the open state,

Figures 26, 27, 28 this version in the closed state,

Figures 29, 30, 31 show a further embodiment of an inventive

clamping device according to the invention with a continuous eccentric roller and a mandrel or pin with counter bearing, in the open state,

Figures 32, 33, 34 this version in the closed state,

Figures 35, 36, 37 show a further embodiment of a clamping device according to the invention with a threaded pin and a threaded hole in the base of the fixing bush, in the open state, and

Figures 38, 39, 40 show this version in the closed state.

Figure 1 shows an insert core 2 made of a lightweight material, preferably plastic, inserted and locked into a first profile piece 1. The insert core 2 is provided with a transverse bore 3 for receiving a fixing bushing 4 and with a longitudinal bore 5 for receiving an anchor bolt 6 and a coil spring 7.

The profile piece 1 and the insert core 2 can, for example, be similar to the corresponding elements described in CH-A-576 591 or EP-O 506 607 or EP-O 123 683.

The anchor bolt 6 is slidably mounted in the longitudinal bore 5, with the helical spring or compression spring 7 being housed in the inner end region of the longitudinal bore 5.

Figure 2 shows that the bolt can have three main parts, namely an upper coupling part 8, a middle slide part 9 and a lower bolt foot 10, and that the slide part 9 is guided through a cross hole in the fixing bushing 4. The coupling part 8 is extended in a roughly sword-like manner and has a hole 11 for a rod which serves for the pivotable mounting of holding pieces 12 (Figure 1). Such holding pieces are known per se from EP-O 506 607 and have a nose 13 which can be inserted into an opening in a profile piece 14 in order to

to exert clamping pressure against a part of this profile piece 14, which partially closes the opening, wherein these holding pieces 12 are preferably stacked flat and alternately with the nose 13 in one direction or the other, evenly distributed on both sides of the coupling part 8.

The clamping device has an eccentric 15 (Figure 12) which comprises an eccentric shaft 16 with diameter D and an eccentric roller 17 with diameter d, wherein preferably 1/3 < d/D < 2/3.

Figure 3 shows a cross-section of a recess 18, which is located in the middle area of the slide section 9. This recess 18 is specially designed to accommodate the eccentric roller 17 and to interact with it when moving the bolt.

Figures 1 and 2 show the clamping device in an open position, in which the bolt is stretched outwards and the holding pieces 12 are in a non-pivoted position. In contrast, Figures 4 and 5 show the clamping device in a closed position, in which the bolt is retracted, i.e. stretched inwards and the holding pieces 12 are in a pivoted position, in which the lugs 13 engage behind the profile piece 14. The axis 19 of the eccentric shaft 16 and the axis 20 of the eccentric roller 17 define a

pivoting plane 21 (Figure 2) or 21' (Figure 5). The comparison between Figures 3 and 6 shows that the rotation of the eccentric 15 does not cause rotation of the bolt 6, so that the slide section 9 does not necessarily have to be round.

The bolt shown in Figures 7, 8 and 9 has a lateral recess 18 which is partially delimited by two parallel walls 22, 23 and a rear arched wall 24 which run perpendicular to a plane containing the longitudinal axis of the bolt, in which the bottom of the recess 18 can also lie. The walls 22 and 23 thus extend perpendicular to the bottom plane and merge into the arched wall 24. The arched wall 24 preferably has a cylindrical surface with radius R1 at each end and a central flat area.

In the lower area of the wall 22 near the floor, the recess 18 is extended by a hollow 25 to a wall 26, which also partially runs parallel to the walls 22 and 23, but has a smaller height h'. The wall 26 preferably extends to the plane perpendicular to the floor plane, where it merges into an arcuate wall 27, which forms a cylindrical surface with radius R2.

The recess 18 thus offers in its upper region a lateral entrance of width a', which corresponds to the distance between the parallel walls 22 and 23, and in its lower region a lateral entrance of width

a ¹ + b', which corresponds to the distance between the parallel walls 26 and 23.

The fixing bushing 4 shown in Figures 10 and 11 is cylindrical and has an outer diameter Da', an inner diameter Di ¹ and a transverse bore with a diameter Db ¹ which is slightly larger than the nominal diameter of the preferably round slide section 9 (Figure 2).

The eccentric shaft 16 of the eccentric 15 shown in Figures 12, 13 has a hexagon socket 28 or other rotating means on one end face and an eccentric roller 17 with an eccentricity e on the other end face. The eccentric roller 17 has a flange-shaped projection 29 with a height h which is slightly smaller than the height h ¹ (Figure 7).

The clamping device according to the invention works as follows:

The width a ¹ (Figure 7) is slightly larger than the diameter c of the projection 29, so that the eccentric 15 can be easily introduced into the fixing bushing 4 from above with a suitable rotation (Figure 1) until the eccentric roller 17 almost reaches the bottom of the recess 18. A further rotation in the clockwise direction causes the projection 29 to be introduced into the cavity 25. At the same time, the eccentric roller 17 presses the wall 22 (Figures 1 ₁ 8). and

thus the bolt to the left (Figure 4), whereby the holding elements 12 are pivoted in order to clamp the clamping device.

The projection 29 and the recess, which could also be omitted, serve to secure the eccentric 15, that is to say, to prevent it from being removed without rotation. Preferably, the eccentric 15 is rotated by about 90° or slightly more so that it remains in a stable position in which the pressure of the spring 7 prevents rotation in the opposite direction, which could open the clamping device.

The coupling part 8 can also be designed with a T-shaped head end as in the clamping device according to CH-A-576 591. The insert core 2 and/or the bolt can otherwise be similar to any of the devices according to the patent documents mentioned at the beginning.

The eccentric 30 shown laterally in Figure 14 with an eccentric roller 31 without a projection has an elongated cylindrical mandrel 32 which is provided with a projection 33 at its end. The mandrel 32 is designed almost concentrically with the eccentric shaft 34, since the eccentricity E32 between the axis of the eccentric shaft 34 and the axis of the mandrel 32 is chosen to be quite small. The mandrel 32 can be grown together with the eccentric roller 31 in the upper area (Figure 15) in order to increase its rigidity. The

Mandrel 32 can therefore only be cylindrical in its lower area, i.e. below the eccentric roller 31. The diameter D32 of the elongated part of the mandrel is noticeably smaller than the diameter of the eccentric roller 31. In contrast, the diameter D33 of the mandrel projection or pin 33 is relatively large.

The bolt 35 shown laterally in Figure 16 has an opening that runs from top to bottom and includes a recess 36 and an elongated hole 37 communicating with it. The recess 36, which corresponds to the recess 18 (Figure 9), but without the hollow 25, is delimited by two parallel walls 38, 39 and an arcuate wall 40, as can be clearly seen from Figure 17.

The recess 36 has a base 41 which is defined, for example, by a plane containing the longitudinal axis of the bolt. This base 41 is perforated vertically through the elongated hole 37 through which the mandrel 32 is inserted, as shown in Figure 16. The elongated hole 37 has an opening extension 42 almost concentric with the axis of the eccentric shaft 34, which is large enough that the projection 33 of the mandrel 32 can be guided through it until it comes out of the elongated hole at the bottom.

The length L37 of the slot 37 corresponds to the sum of the total stroke Lh of the bolt in its longitudinal movement and the mandrel diameter D32. The following therefore applies:

L37 > Lh + D32.

The width B37 of the slot corresponds to the sum of the mandrel diameter D32 and twice the eccentricity E32. Therefore, if the condition

B37 > D32 + 2 . E32

is fulfilled, the mandrel 32 can be in any position within the elongated hole 37 during the movement of the bolt.

The diameter D33 of the projection 33 is selected to be larger than the width B37, so that the mandrel 32 can only be removed from the slot in a single position, namely through the extension 42, which is only possible in the open state.

The mandrel 32 therefore has a similar function to the projection 29 and the cavity 25.

The eccentric 43 shown in Figures 18 and 19 has an eccentric pin 44 which is integrated into a partially spiral-shaped eccentric roller 45 and is therefore a part of it. The eccentric pin 44 is designed in its main working area in the same way as the eccentric

roller 17 according to Figure 12, but extended by a spiral-shaped wall 46. The eccentric roller 45 also has a projection 47 dimensioned similarly to that in the case of Figure 12.

The bolt according to Figures 20 to 22 is also guided through the transverse bore of the fixing bushing 4 and has a recess 48 delimited by two parallel walls 49 and 50, which extends over the entire width of the bolt.

Figure 20 shows the spiral disc 45 in the open position. The eccentric pin 44, which is in the form of a half cylinder, is in a similar position to that in Figure 1, with point A at the very bottom. After a 90° clockwise rotation, point A would also be in a dead position similar to that in Figure 1. However, after point A has rested on wall 49, the spiral wall 46 continues to act, moving the bolt even further to the left. It is also possible to rotate the eccentric up to about 270°, moving the bolt ever further to the left (Figure 22).

From Figures 20 to 22 it can be seen that the parallel walls 49, 50 do not run exactly perpendicular to the longitudinal axis of the bolt, but form an angle with it, such that the wall 49 touches the spiral wall 46 just at the longitudinal axis. Since this angle is very small, the operation of the clamping device is

The frictional force between the wall 49 and the wall 46 is irreversible over a very wide range because the frictional force between the wall 49 and the wall 46 is large enough to prevent slipping. Preferably, however, the walls 49, 50 are exactly perpendicular to the longitudinal axis of the bolt.

The clamping device according to Figures 20 to 22 is therefore much less sensitive to compliance with manufacturing tolerances, especially with regard to the profile piece 1 and the holding pieces 12, than the design according to Figure 1.

In order to keep the eccentric captive in the closed state, an elongated cavity 51 is provided in the lower area of the left wall 49, which is delimited by a lower inner wall 52. Preferably, the walls 49 and 52 run parallel. There can also be a cavity in the lower area of the right wall 50, as shown in the figures, but it is also possible to move the right wall 50 so far to the right that the spiral wall 46 can be easily rotated near it.

The recess 51 is thus a groove which receives the projection 47 and thereby prevents the eccentric 43 from being pulled out in the closed state.

The design according to Figures 18 to 22 can also be realized without projection 47 and without hollows 51, 53, especially if the eccentric 43 has an elongated

mandrel as in the case of Figure 14 and the bolt has an elongated hole as in Figures 16 and 17.

The embodiment according to the present invention shown in Figures 23 to 28 has a bolt with a recess that extends over the entire depth of the bolt, an eccentric roller 54 being provided that is guided over the entire depth of this recess, and the projection or pin 55 of the eccentric roller 54 can rest on a lower, slightly flat recess 56 of the bolt. The fixing bushing can in this case have a base 57 that serves as a guide for the movement of the eccentric roller.

The design shown in Figures 23 to 34 has a bolt with a continuous inverted U-shaped recess for the eccentric roller. In Figure 29, the pin 58 is received in a central opening in the base 59 of the fixing bushing in order to form an axial bearing.

In the versions with an elongated hole according to Figures 16 and 17, the mandrel 32 can also be provided with a concentric extension or a pin, which can also be accommodated in a central round opening in the base of the fixing bush. In contrast, the versions according to Figures 1 to 6, 16, 17 and 23 to 34 can also be supplemented with a part of a spiral-shaped wall according to Figure 18 with or without a projection in order to make optimal use of the available space.

In the design according to Figures 14 and 15, the eccentricity E32 can also be zero and the projection 33 can be T-shaped instead of flange-shaped, in which case the extension 42 (Figure 17) is also omitted, and in which a pin can also be present as an extension of the dome 32 or the projection 33, which serves for axial bearing on the bottom of the fixing bush as shown in Figures 29 and 31. The flat surface 56 (Figure 23) can take over the effect of the cavity 25 (Figure 7).

In the embodiment according to Figures 35 to 40, the bolt 60 has a recess 61 that does not have to be open at the side. Rather, the recess 61 is a through hole with a radius R61 through which the preferably round eccentric roller 62 of the eccentric 63 can be guided if the bolt 60 is in a suitable position. In addition to the eccentric shaft 64 and the eccentric roller 62, the eccentric 63 also includes a pin 65 that is preferably provided with a thread 66 that engages in the threaded hole 67 of the base 68 of the fixing bush 69 and secures the eccentric against falling out.

The eccentric shaft 64, which is provided on the front with a hexagon socket 70 or other means of rotation, and the mandrel or pin 65 are formed coaxially in the eccentric 63 at the ends of the eccentric roller 62, whose longitudinal axis 71 runs parallel and eccentrically to the axis of rotation 72 of the eccentric. When rotating, the eccentric roller 62 presses against an area

73 of the inner wall of the recess 61 and presses the bolt 60 inwards. In this case, the dimensions were chosen so that the eccentric makes half a turn to go from the open to the closed state.

The eccentric roller is relatively long in some examples (e.g. 54 in Figure 23 or 62 in Figure 35) and in other examples relatively short (e.g. 22 in Figure 1) or relatively flat (e.g. 45 in Figure 20).

In all versions, the eccentric roller can have an extension in the form of a threaded pin that interacts with a threaded hole in the base of the fixing bush.

Claims (10)

Expectations 1 . Clamping device for detachable connection two profile pieces (1, 14), wherein in a first of the profile pieces (1) an insert core (2) can be inserted and fixed, which has an axially movable bolt (6) with an end part which comprises a nose that can be inserted at least partially into an opening of a second profile piece (14) in order to exert a clamping pressure against a part of the second profile piece that partially closes the opening, wherein eccentric means are present that engage in the bolt (6) via a system of sliding surfaces in order to move it axially, characterized in that the eccentric means comprise an eccentric (15), an eccentric shaft (16) and an eccentric roller (17), that the bolt (6) has a slide part (9) with a recess (18) that is delimited by a wall (22) in the form of a surface running parallel to the axis of rotation (19) of the eccentric shaft (16), and that when the eccentric (15) rotates, the eccentric roller presses against this wall (22) in order to move the bolt (6) into the interior of the insert core (2) so that the said nose can exert the intended clamping pressure. 2. Device according to claim 1, characterized in that the eccentric roller is a round eccentric pin (17) or an eccentric disk (43) with a round part (44) and a spiral part (45). 3. Device according to claim 1 or 2, characterized in that the eccentric roller has a flange-shaped projection (29; 47) which, at least in the region of the closed position of the device, is guided through an extension of the recess (T8; 48) in the form of a cavity (25; 51), and that this cavity (25; 51) is located in the region of this wall (22; 49) where the slide pressure is exerted. 4. Device according to one of claims 1 to 3, characterized in that on the front surface of the eccentric roller a mandrel (32) is formed which runs parallel to the axis of rotation of the eccentric shaft (34) and is inserted through an elongated hole (37) at the bottom of the recess (41). 5. Device according to claim 4, characterized in that the mandrel (32) is arranged eccentrically and that the elongated hole (37) has an extension (42) in the region of the axis of rotation of the eccentric shaft. 6. Device according to claim 4 or 5, characterized in that the mandrel is designed as an extension of the eccentric roller (54), 7. Device according to claim 5 or 6, characterized in that the mandrel comprises an additional coaxial extension (58), and that the fixing bushing has a base (59) with a central bore or countersink for receiving and supporting this coaxial mandrel extension (58). 8. Device according to one of claims 4 to 7, characterized in that the end region of the mandrel (32) a flange- or T-shaped projection (33) and/or that the eccentric roller has an extension in the form of a threaded pin. 9. Device according to one of claims 1 to 8, characterized in that the eccentric has a rotation range between zero and an angle W which has a predetermined value between 80° and 300°. 10. Device according to one of claims 1 to 9, characterized in that the eccentric means are rotatably guided by a fixing bush (4), and that preferably the eccentric roller (17) is formed on one end face of the eccentric shaft (16).