EP0023619A1 - Two-part clamping device - Google Patents

Abstract

1. Pair of connecting strainers for interlocated reciprocally braced ends of channel-shaped mine-lining frames, of which the clamping connectors (A, B) comprise, engaging under the gallery-side lining profile (2) and bearing on the flanges (6) thereof, half-clamps (9, 9'), the flanges (13) of which are traversed by the shanks of hook-head bolts (11), the hook heads of which engage over the flanges (5) of the face-side lining profile (1) and bolted onto the ends of which are clamping nuts (12) which are braced on those sides of the flanges (13) of the half-clamps (9, 9') which are remote from the face-side lining profile (1), the clamping connector (A), which is associated with the end of the face-side lining profile (1) having, to bridge this, a cover plate (10) provided, for the hook heads of the bolts (11) of the clamping connector (A), with in each case a throughway aperture (25, 26) and with a drive member (15) associated with the face-side lining profile (1), a drive member (14) being provided on the halb-clamp (9') of the clamping connector (B) associated with the end of the gallery-side lining profile (2) and being associated with the gallery-side lining profile (2), characterised in that at least the half-clamp (9) of the clamping connector (A) which is associated with the face-side lining profile consists of two parts (16) which are separably connected to each other in the regions of their contacting face (17), the mutually contacting contours of half-clamp (9) and gallery-side lining profile (12) and the throughway apertures (25, 26) in the cover plate (10) being so formed that by separating the two parts (12), it is possible to bring about an opening-out movement of hook-head bolts (11) and half-clamp parts (16), permitting of a friction-inhibited and limited slipping of the gallery-side lining profile (2).

Description

The invention relates to a multi-part clamping connection for the mutually supporting ends of channel profiles of pit support frames which are supported one on the other, which comprises a half-clamp that engages under the track-side expansion profile and abuts against its flanges and a tab that bridges the butt-side expansion profile, the half-clamp and the tab consisting of the shafts are penetrated by fastening screws, on the ends of which clamping nuts are screwed, which are supported on the sides of the bottle of the half-clamp facing away from the butt-side expansion profile.

A multi-part clamping connection of the aforementioned type is known, for example, from DE-PS 25 47 407. Two clamping connections are provided at an overlap point, which are arranged at a distance from one another. The segments of multi-part expansion frames made of channel profiles are under very high tension in the overlap areas due to the insertion etc. These voltages must be absorbed by the connections. The segments of such expansion arches must e.g. in the transitional area strut / stretch or when unscrewing the arches.

In particular, the clamping connection that the front of the is assigned to the butt-side expansion profile, is under high tension, while the tensioning connection assigned to the end face of the track-side profile is subjected to less stress because the profiles are supported on one another at the point where the latter connection is located. By contrast, under the effect of the stresses arising from the stress on the expansion frame, in particular bending stresses in the expansion level, the profiles at the point where the first-mentioned connection is located tend to stand out from one another. Therefore, when the connections are removed, the connections assigned to the end face of the track-side profile are first released. This can be done safely. If the screws of the connection assigned to the end face of the butt-side profile are now loosened, the last screw of this connection that has not yet been loosened is subjected to increased tension, possibly to such an extent that the nut can be removed from the screw if it is only 1 to 2 Threads with the screw is engaged. This represents a not inconsiderable risk of accidents. This connection applies all the more, the more heavy expansion profiles have to be used underground.

To avoid this disadvantage, it is known to use a robbery device which has a two-part Has robber fork, which is pivotally mounted in a traverse. A hydraulic cylinder with a bayonet lock can be used in the traverse. When the tensioning connection is released, the robbery fork is placed on the tab of the tensioning connection, while the piston of the hydraulic cylinder is supported on the route side on the half-clamp of the connection. By loading the hydraulic cylinder, the clamping connection is relieved, so that the nuts can be safely removed from the screws. However, this known robbery device has the disadvantage that the robbery fork cannot be easily placed on the butt-side flap if warping material and rock pressed into the track do not allow this. In addition, the robbery device has a comparatively high weight and the application of hydraulic pressure to the cylinder requires a relatively long time, so that its handling is difficult, which often leads to the robbery fork not being used, but this is associated with considerable dangers.

Starting from this prior art, the invention has for its object to improve a multi-part clamping connection of the type mentioned in such a way that this enables a safe release of the clamping connection without the use of special aids.

According to the invention, this is achieved in that at least the half clamp is designed to be divided, which is assigned to the end face of the butt profile and the parts are releasably connected to one another in the areas of their division. Basically, the tabs of both connections can be divided. However, since the screws of the connection, which is assigned to the end face of the track-side profile, can be loosened safely, a division can be dispensed with in this connection. This configuration ensures that the parts of the half-clamp gap after the connection between them is loosened under the effect of the tension between the mutually lying ends of the track-side and butt-side expansion profile, the hook-head screws pivoting and the parts of the half-clip sliding upwards on the track-side expansion profile, whereby a not inconsiderable braking effect is achieved by the shape of the parts and, if applicable, their abutment (warping, rock). The junction of the two parts of the half-clamp is easily accessible, so that it can be loosened without being hindered by rocks or warpage. In addition, a special robbery device is no longer required, but only a tool to release the connection of the two half-clamp parts, which can be carried out in a simple manner.

The half-clamp is advantageously divided in half, so that both parts are identical and can be produced with the same tool. The subdivision is located in the central area of the floor of the track-side expansion profile, which is easily accessible.

According to a further feature of the invention, the parts of the half clamp in the areas of their division have mutually associated, stepped division surfaces which engage in one another in a form-fitting manner. This design results in a positive connection in any direction, so that the fastening means are not or only slightly stressed on shear.

According to a further proposal of the invention, the parts of the half clamp are equipped in the areas of their division with protruding, mutually assigned approaches, which are used to attach the fastener or fasteners. The lugs can be flange-shaped and can be provided with through openings aligned with one another, into which one or more fastening means connecting the parts of the half clamp are inserted. As fastening means, etc. may be used which, if necessary _o by cotter pins, snap rings, etc., may be secured in this embodiment roll pins, bolts, eye bolts. However, it is also possible to approach the two To shape parts so that they form a columnar or tubular body. At their lower edges, these have beads which complement one another to form a closed ring and are surrounded by one or more fastening means, for example in the form of clamp-like rings, etc.

The fasteners can be released from the secured area by pressing, pulling, blowing up, etc. the fasteners.

According to a further proposal of the invention, the tab which causes the hook screws to be carried has an approximately eyeglass-shaped outline, the two outer parts of which are arranged in a plane parallel to the plane of the central part, the recesses of the Zasche support surfaces for the hook head screws being provided in the center longitudinal axis of the recesses in the edge regions of the tabs merge into the edges of the recesses. This design of the tabs entails that after loosening the fasteners of the two parts of the half-clamp the hook-head screws can perform a pivoting movement, the free ends of their heads pushing further into the inner profile and their ends provided with the screws being opened both parts of the half clamp swing away from the expansion profiles.

• Fig. 1 in abgebrochener Darstellung eine Spannverbindung in Seitenansicht in bekannter Ausführung,
• Fig. 2 eine Vorderansicht der Fig. 1,
• Fig. 3 eine Vorderansicht der Halbschelle gemäß der Erfindung,
• Fig. 4 eine Draufsicht der Fig. 3,
• Fig. 5 eine Seitenansicht der Fig. 3,
• Fig. 6 eine Vorderansicht einer anderen Ausführungsform der Halbschelle,
• Fig. 7 eine Draufsicht der Fig. 6,
• Fig. 8 eine Seitenansicht der Fig. 6,
• Fig. 9 eine Draufsicht eines Teils der Halbschelle,
• Fig. 10 eine Draufsicht der Lasche,
• Fig. 11 eine teilweise geschnittene Vorderansicht der Fig. _'10 gemäß der Linie X-X der Fig. 10 und
• Fig. 12 eine Vorderansicht der Fig. 1, jedoch mit gelösten Teilen der Halbschelle.

An embodiment of the invention is explained in more detail with reference to the drawing, which shows:

• 1 is a broken view of a clamping connection in side view in a known embodiment,
• 2 is a front view of FIG. 1,
• 3 is a front view of the half clamp according to the invention,
• 4 is a plan view of FIG. 3,
• 5 is a side view of FIG. 3,
• 6 is a front view of another embodiment of the half clamp,
• 7 is a plan view of FIG. 6,
• 8 is a side view of FIG. 6,
• 9 is a plan view of part of the half clamp,
• 10 is a plan view of the tab,
• Fig. 11 is a partially sectioned front view of FIG. _'10 along the line XX of Fig. 10 and
• Fig. 12 is a front view of FIG. 1, but with parts of the half clamp released.

The expansion profile facing the mountains is referred to as the impact-side expansion profile 1 and lies in the overlap expansion-side expansion profile 2. The two profiles are congruent and are supported in the area near the ground and on the webs generally designated 3 and 4 from each other. At their ends, the webs 3, 4 merge into the flanges 5 and 6.

At the overlap, the profiles are connected using the two clamping connections A and B. The tension connection A is assigned to the end face 7 of the butt-side expansion profile 1, while the tension connection B is assigned to the end face 8 of the track-side profile 2.

The tensioning connection A has a half-clamp 9, which engages under the track-side expansion profile 2, and a tab 10 bridging the butt-side expansion profile 1. Half-clamps 9 and tab 10 are penetrated by the shafts of the fastening screws 11, which are designed as hook-head screws. Clamping nuts 12 are screwed onto the ends of the fastening screws 11, which are supported on the sides of the flanges 13 of the half-clamp 9 facing away from the butt-side expansion profile 1. The flanges 13 of the half-clamp 9 rest on the undersides of the flanges 6 of the track-side expansion profile 2. The bottles 13 of the half-clamp 9 and the outer areas of the tab 10 are provided with through openings through which the fastening screws 11 pass.

In the tensioning connection B, two drivers 14 are forged onto the half clamp 9 'and extend on the end face 8 of the side expansion profile 2.

The effect of the drivers 14 of the half clamp 9 'of the clamping connection B corresponds to that of the driver 15 of the tab 10 of the clamping connection A, which bears against the end face 7 of the expansion profile 1 on the impact side.

The mode of operation of a connection consisting of the two clamping connections A, B is known per se from DE-PS 25 47 407, to which reference is made to avoid repetition.

The connection according to the invention can be seen from FIGS. 3 to 9. Thereafter, the half-clamp 9 is formed divided, exactly half, so that the two identical parts 16 result. In the area of their dividing surface 17, the parts 16 are provided with a step 18, which results in a positive connection in each direction of the half-clamp 9. The step 18 does not have to run in a straight line so that identical half-clamp halves are provided.

The parts 16 of the half clamp 9 are equipped in the areas of their division 17 with projecting, mutually associated lugs 19, which serve to connect the two parts 16 to one another.

3-5 are the protruding ones Lugs 19 are flange-like and are provided with aligned through openings 20 into which a fastener connecting the parts 16 is inserted, for example an eye bolt, which is not shown in detail.

6-8, the projecting lugs 19 are shaped such that they form a columnar or tubular body, the cross section of which is approximately rectangular in the illustrated embodiment. At their lower edges, the lugs 19 have beads which complement one another to form a closed ring 21. The lugs 19 are from a fastener, not shown, e.g. a clamp-shaped ring or the like., Gripped so that the two parts 16 of the half-clamp 9 are connected to each other.

10 and 11 show the structure of the tab 10, which has an approximately eyeglass-shaped outline, so that a central bow-shaped section 22 can be distinguished from the two adjacent outer areas 23, 24. The bow-shaped section 22 lies in the main plane of the tab 10, while the outer regions 23, 24 are arranged in a plane parallel to the plane of the bow-shaped section 22, as can be seen in FIG. 11. In the middle Ab Section 22 and in the outer regions 23, 24, recesses 25, 26 are provided, which are penetrated by the shafts and head regions of the fastening screws 11. In the recesses 25, 26 of the tab 10, support surfaces 27 are provided for the fastening screws, which in the central longitudinal axis 28 of the recesses 25, 26 in the outer regions 23, 24 of the tab merge into the edges of the recesses 25, 26, ie run with them. This configuration of the support surfaces 27 gives the possibility of a pivoting movement for the fastening screws 11, as is explained in detail below with reference to FIG. 12.

After loosening the fastener, not shown, from or from the shoulders 19 of the parts 16 of the half clamp 9, the tension connection A gapes apart and assumes the position shown in FIG. When the parts 16 of the half clamp 9 are gaped apart, the fastening screws 11 perform a pivoting movement, the hook-shaped parts of which move further into the interior of the stub-side expansion profile 1, while the ends of the fastening screws 11 are pivoted away from the expansion profiles 1. At the same time, the nested ends of the expansion profiles 1, 2 stand out from one another while reducing their tension, so that there is a space between them.

It is particularly advantageous that the clamping connection A according to the invention can be brought to the surface in the divided state, where it can be prepared for a new use underground if necessary after checking and disassembling the individual parts.

During the gaping movement, the flanges 13 of the half-clamp 9 slide along the outer sides of the flanges 6 of the track-side expansion profile 2, so that there is a high braking effect due to the friction of these parts against one another, in particular due to the spreading apart, which results in a safe gaping apart of the parts 16 Half clamp 9 brings with it, furthermore also when warping material and rock lie close to the connections.

The fastening means, not shown, can be released from a secured field, it being possible to connect the two parts 16 with a collecting basket, net or the like. Equip so that a bolt or the like thrown out under the tension of the nested ends of the expansion profiles, for example after loosening. can be caught.

Claims (9)

1.) Multi-part clamping connection for the mutually supporting ends of channel profiles of pit support frames, which ends are supported one on the other, which consists of a half-clamp that engages under the track-side expansion profile and adjoins its flanges, and a bracket that bridges the butt-side expansion profile, the half-bracket and the bracket from the shafts are penetrated by fastening screws, on the ends of which clamping nuts are screwed, which are supported on the sides of the flanges of the half-clamp facing away from the butt-side expansion profile, characterized in that at least the half-clamp (9) is of divided design and the parts (16) in the areas of them Division (17) are releasably connected. 2.) Multi-part clamping connection according to claim 1, characterized in that the half clamp (9) is divided in half. 3.) Multi-part clamping connection according to claim 1 and / or 2, characterized in that the parts (16) of the half-clamp (9) in the areas of their division (17) have mutually associated gradations (18) which interlock positively. 4.) Multi-part clamping connection according to claim 1 and / or one or more of the following, characterized in that the parts (16) of the half-clamp (9) in the areas of their division (17) are equipped with projecting, mutually associated approaches (19) . 5.) Multi-part clamping connection according to claim 1 and / or one or more of the following, characterized in that the lugs (19) are flange-like and are provided with aligned openings (20) into which one or more, the parts (16) the half-clamp (9) connecting fasteners are used. 6.) Multi-part clamping connection according to claim 1 and / or one or more of the following, characterized in that the lugs (19) of the two parts (16) are shaped such that they form a columnar or tubular body. 7.) Multi-part clamping connection according to claim 6, characterized in that the lugs (19) have at their lower edges to a closed ring (21) complementary beads. 8.) Multi-part clamping connection according to claim 6 and / or 7, characterized in that the approaches (19) are gripped by one or more fastening means. 9.) Multi-part clamping connection according to claim 1 and / or one or more of the following, characterized in that the tab (10) has an approximately spectacle-shaped plan, the two outer regions (23, 24) in a parallel plane to the plane of the bow-shaped section (22nd ) are arranged and that in the recesses (25, 26) of the tabs (10) support surfaces (27) for the heads of the fastening screws (11) are provided, which in the central longitudinal axis (28) of the recesses (25, 26) in the edge regions (23, 24) of the tab (10) merge into the edges of the recesses (25, 26).

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