JP2006329427A - Clamp, particularly profile clamp or hose clamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify manufacture of a clamp. <P>SOLUTION: The clamp has a ring-section clamp body 2 having first and second ends in a circumferential direction of the clamp body. The first end has a first loop 7 formed by a first folded band 5. A first bolt 8 is arranged in the first loop 7. The first bolt 8 has a circumferential surface and two opposed end faces. The first bolt has a depression 23 and 24 disposed in the circumferential surface at a predetermined spacing relative to one of the two end faces. The first folded band has a projection 17 and 18 that projects from the first folded band in a direction toward the first bolt and engages with the depression. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a clamp, in particular a profile clamp or a hose clamp, comprising an annular cross-sectional clamp body having a loop formed by a folded band at at least one end in the circumferential direction. A bolt is disposed in the loop, and the folded band has a molded portion that contacts the bolt.

  Such a clamp, configured as a profile clamp, is disclosed in the book “Normaconnect V QRC” published by the company Rasmussen GmbH in Maintal 63477, Germany. Loops are provided at both ends of the clamp body and bolts are placed on each loop respectively. A screw is screwed into one of the two bolts. This bolt is suspended from the other bolt. The two loops are pushed down somewhat in their axial end regions. This recess forms an axial fixing means that prevents the bolt from falling off the loop.

  Such clamps are in fact generally accepted. However, its manufacture is relatively complicated because the folding band can only be deformed when the bolt is inserted.

  The object of the present invention is to simplify the manufacture of the clamp.

  According to the invention, this is provided with at least one recess provided on the circumferential surface of the bolt at a predetermined distance from the end surface of the bolt, the recess being fitted by a protrusion protruding in the direction from the folded band towards the bolt Is achieved.

  The protrusion can already be made when the folded band is still the first planar structure. Therefore, the manufacture of the protrusion is relatively simple. For example, the protrusion is generated by stamping a band, that is, by creating an indentation at a predetermined position. This stamping process can be performed at the same time as the manufacturing process, which later creates a notch through which the screw is guided. Despite the presence of the indentation, the bolt can be inserted into the loop. However, this requires a certain force. As soon as the protrusion is fitted in the recess, the bolt is secured so that it is confined axially in the loop.

  Preferably, the recess is limited to a predetermined circumferential region. Thereafter, the contact between the protrusion and the recess has a further advantageous effect. The protrusions not only form an axial locking means that prevents the bolt from falling out of the loop, but also form a rotary locking means, whereby the bolt stays in a predetermined arrangement with respect to its angular position or at least a predetermined in the loop. Stay in the range of placement. This makes it easier to bring the screw into engagement with the bolt during attachment of the clamp. For example, when configuring a bolt as a suspension bolt, the recess and protrusion are aligned with each other so that the recess into which the screw must be inserted is always aligned to be open to receive the screw. When the screw is already guided through the unthreaded hole of the bolt, a rotating locking action is also advantageous because it is easy to insert the screw into the screw hole of the other bolt.

  Preferably, the recess is formed by a groove having a bottom surface that is concave or forms a straight line. Such grooves can be made relatively easily in the bolt, for example by rolling with a disc milling tool.

  As an alternative or in addition, the recess can be formed by a groove having a boundary wall located circumferentially at an angle of up to 45 degrees with respect to the radial direction. In this way, the escape moment required to rotate the bolt beyond the allowable range is overcome by overcoming the interaction between the protrusion and the groove. In this case, the protrusions must be cut off, which is virtually impossible when applying normal force to the commonly employed material.

  It is also advantageous when the bolt is configured as a suspension bolt. Suspension bolts are disclosed in connection with the aforementioned Norma Connect QRC type profile clamp. In this clamp, the advantages of the rotary fixing means of the bolt are particularly well demonstrated. When it is ensured that the receptacle of the suspension bolt always faces the screw using the rotary fixing means, the clamp can be closed without any problem, without having to rotate the bolt to the receiving position in advance. This receiving position has already been adjusted when the clamp is manufactured.

  Conveniently, the recess extends over a circumferential angle range of 40 to 80 degrees. Thus, a constant rotation of the bolt relative to the screw is allowed. This takes into account that the bolt must rotate to some extent within the loop when tightening the clamp. This rotational motion is greater for clamps with a smaller nominal diameter than for clamps with a larger nominal diameter. The same bolt can be used for clamps with different nominal diameters, for example, nominal diameters of approximately 50 mm to approximately 300 mm, when an appropriately sized circumferential angle is provided. The possible rotation of the bolt in the loop is not disturbed as long as it is ensured that the screw can be inserted into its receptacle.

  It is advantageous when a second loop is provided at the other end of the clamp body with a second bolt made from and arranged on the folded band, the folded band being at least one protrusion. The protrusion protrudes in the direction toward the second bolt and fits into a recess located at a predetermined distance from the end surface of the second bolt disposed on the circumferential surface of the second bolt. The same advantages apply as discussed in relation to the first bolt described above. The bolt is secured by the interaction of protrusions and recesses against axial movement outside the loop.

  Preferably, the recess of the second bolt is configured as a circumferential groove. Such circumferential grooves are produced, for example, by turning. In this case, the second bolt can rotate in the groove substantially without limitation. This is advantageous, for example, when the first bolt is a suspension bolt. The free rotation of the second bolt provided with a screw makes it easier to press the profile clamp, for example across the tube or pipe fitting. This is because the screw in this case can be swiveled outside the attachment passage.

  Preferably, the second bolt is a screw bolt. It has a hole in which a thread is provided. Screws are screwed onto this thread.

  It is also advantageous for the bolt to have a bevel on at least one end surface. This ramp facilitates installation. The bolt is then pushed into the loop. The slope pushes the folded band somewhat radially outward of the projection area. However, the folded band rebounds due to its elasticity, so that the projection is fixed in a recess, so to speak.

  It is also advantageous for the protrusion to be arranged in the region of the folded band that is directed towards the other end of the clamp body. When the clamp is tightened, the projection is pulled into the recess, so to speak, thereby providing improved fixability for the bolt in the loop. In the untightened state, the bolt is still tightly surrounded by the folded band, so that the projection projects into the recess sufficiently safely.

  The clamp 1, which is a profile clamp in the illustrated embodiment, has a clamping band 2 made of metal that is formed as an annular cross section and is elastically bent. Three profile parts 3 are attached to the clamping band 2 by spot welding, for example. The profile part 3 is made of a relatively hard metal. They have a trapezoidal cross section, that is, they are provided with two sides aligned at a predetermined angle with respect to each other.

  The clamping band 2 has portions referred to as folded bands 4 and 5 at its two ends, respectively. Each folded band 4, 5 forms a loop 6, 7 in which the bolt is placed. In this connection, one bolt is the suspension bolt 8, while the other bolt is the screw bolt 9. The screw 10 is screwed into the screw bolt 9. The screw 10 is inserted into the recess 11 of the suspension bolt 8 and then rests on the contact surface 12 shown in FIG. 4b. The contact surface 12 is at least partially surrounded by an annular wall 13 so that the head 14 of the screw 10 is securely held in place. As long as the clamp 1 is pushed outward with a constant tension, the screw 10 can no longer be removed from the suspension bolt 8 once it has been inserted into the suspension bolt 8. Thereafter, when the screw 10 is rotated using a suitable tool coupled to the head 14, the two ends of the clamping band 2 move towards each other and the clamp 1 is tightened.

  FIG. 3 shows one end of the clamping band 2 with the folded band 5 forming a loop 7 for the suspension bolt 8. The suspension bolt 8 is shown in different perspective views in FIGS. 4a and 4b.

  The folded band 5 has a slot 15 parallel to the longitudinal extension of the clamping band 2 in the flat state of the clamping band 2. During assembly, the screw 10 is pressed through the slot 15.

  The folded band 5 has an indentation on its end surface 16 forming two protrusions 17, 18, i.e. protrusion elements directed inwardly within the loop 7. These protrusions 17, 18 can already be produced with the clamping band 2 in an expanded or flat state, for example when the slot 15 is stamped or die cut. When the folded band 5 is subsequently bent to form the loop 7 and when joined with the remainder of the clamping band 2 using two welds 19, the projections 17, 18 are in the position shown.

  FIG. 3 shows only one folded band 5. The other folded band 4 forming the loop 6 is identical and bilaterally symmetrical with the folded band 5 so that the protrusions 17, 18 of the folded band 5 oppose corresponding protrusions or indentations of the folded band 4.

  FIGS. 4 a and 4 b show further details of the suspension bolt 8. The suspension bolt 8 is a cylinder 20 having inclined surfaces 21 and 22 on its end surface. In the center of the axis of the cylinder 20, the aforementioned recess 11 is provided. The recess 11 is defined on one side by the contact surface 12 as described above.

  Opposite the contact surface 12, the suspension bolt 8 has two grooves 23, 24 on its circumferential surface. However, these grooves 23, 24 do not extend over the entire circumference of the suspension bolt 8, but only extend over a part of the circumference. This circumferential portion is preferably at an angle in the range of 40 to 80 degrees. In an embodiment, the angle is approximately 60 degrees.

  For example, as can be seen from the cross-sectional views of FIGS. 6a-6c, the grooves 23, 24 have a convex bottom. The bottoms of the grooves 23, 24 can also be formed as straight lines. In the improved embodiment shown in FIG. 8, the circumferential grooves 23, 24 are defined by boundary walls 25, 26 that are maximum relative to the radial direction of the suspension bolt 8. Located at a 45 degree angle. Preferably, the boundary walls 25, 26 have a smaller radial angle, specifically they are parallel to the radial direction.

  For attachment, the suspension bolt 8 is pushed into the loop 7 so that the projections 17, 18 fit into the grooves 23, 24. For this purpose, a certain amount of force must be exerted to push the suspension bolt 8 into the loop 7. In this connection, one of the slopes 21, 22 (depending on which end of the suspension bolt 8 is pushed into the loop 7) is used to expand the folding band 5 somewhat, whereby the suspension bolt 8 Can move beyond the projections 17,18. This expansion action is realized in the elastic region of the folded band 5, whereby the protrusions 17, 18 are fitted into the grooves 23, 24 once positioned opposite to the grooves 23, 24. The suspension bolt 8 is then secured in the loop 7 so as to be confined.

  Since the grooves 23, 24 do not extend over the entire circumference of the suspension bolt 8, this structure also leads to a limitation of the rotational movement that can be performed by the suspension bolt 8 in the loop 7 formed by the folded band 5. This is explained in detail in connection with FIGS. 6a to 6c.

  FIGS. 6 a to 6 c show suspension bolts 8 with different rotation angles in the loop 7. In FIG. 6a, the maximum rotation angle is shown, ie the groove 24 contacts the protrusion 17 at a low edge. In FIG. 6c, the opposite extreme position is shown, ie the suspension bolt 8 is rotating counterclockwise in the loop 7 (relative to the example of FIG. 1). FIG. 6b shows an intermediate position.

  However, in all three positions, it is possible to fit into the recess 11 by a simple downward movement of the screw 10 and thus insert the screw 10 into the recess 11. As soon as the screw 10 contacts the bottom 27 of the recess 11, the bottom 27 is aligned parallel to the longitudinal extension so that the head 14 of the screw 10 can rest on the contact surface 12.

  Since the grooves 23 and 24 only extend over an angle of 60 degrees in the circumferential direction, for example, the rotational mobility of the suspension bolt 8 in the loop 7 is limited to just that angle.

  In contrast, the screw bolt 9 shown in FIG. 7a does not have any rotation restrictions. The screw bolt 9 also has a cylinder 28. The cylinder 28 has a screw hole 29 in the center. On the end surface of the cylinder, slopes 30, 31 are provided. Further, the screw bolt 9 has circumferential grooves 32 and 33 at the same predetermined intervals as the grooves 23 and 24 from the end surface.

  FIG. 7 b shows a cross section of the screw bolt 9 in the region of the groove 32. This indicates that the groove 32 extends about the entire circumference of the screw bolt 9.

  The screw bolt 9 is mounted in the same way as the suspension bolt, ie it is pushed into the loop 6 from the side. The main one of the slopes 30, 31 elastically spreads the folding band 4, thereby fixing the protrusions in the grooves 32, 33, not shown in detail. Thereafter, the folded band 4 is contracted again and fixed to the loop 6 so that the screw bolt 9 is confined. Subsequently, the screw 10 is screwed onto the screw bolt 9. When the screw 10 is not extremely screwed onto the screw bolt 9, the screw 10 pivots relatively far, for example so that the screw 10 is positioned at an angle of approximately 90 degrees with respect to the clamping band 2. Thus, in this position, no obstruction is created when the clamp 1 is placed on the pipe joint or provided to surround the finished pipe.

  As described above, the protrusions 17 and 18 are made, for example, by stamping or embossing. The protrusions 17 and 18 are arranged such that the protrusions are pushed into the grooves 23, 24 or 32, 33 when the screw 10 is screwed onto the screw bolt 9, respectively. Therefore, it is certain that the suspension bolt 8 and the screw bolt 9 are fixed in the axial direction in any case.

  Instead of the suspension bolt 8 as shown in FIGS. 4a and 4b, a through bolt may be employed. Such through bolts have a threadless hole through which the screw 10 is pressed. The head 14 of the screw 10 rests on the appropriate contact surface of the through bolt.

  When threaded bolts 9 and through bolts are provided in the clamp, it is possible to form grooves 23, 24 that provide a rotational angle limit to the threaded bolts 9 and to allow the through bolts to rotate more or less freely. It is convenient. Of course, it is possible to provide a rotational angle limit in the case of through bolts, as in the case of threaded bolts.

  Suspension bolts 8 and threaded bolts 9 or through bolts (not shown in detail) and threaded bolts 9 rotate somewhat within the loops 6, 7 during tightening, so that such rotational movement may be permitted. is necessary. This is ensured in any case by means of the grooves 23, 24 extending at a certain circumferential angle with the suspension bolt 8.

  While specific embodiments of the invention have been shown and described in detail with illustrations of inventive principles, it is understood that the invention may be practiced otherwise without departing from such principles. I want to be.

It is a side view of a profile clamp. It is a profile clamp in a perspective view. A loop at one end of the clamp body is shown. The suspension bolts are shown in different perspective views. The suspension bolt arrange | positioned at the loop is shown in partial cross section. FIG. 6 shows the detailed VI of FIG. 5 at different relative positions. The screw bolt is shown in a perspective view and a sectional view, respectively. Fig. 2 shows a part of the improved embodiment suspension bolt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamp 2 Tightening band 3 Profile part 4 Folding band 5 Folding band 6 Loop 7 Loop 8 Suspension bolt 9 Screw bolt 10 Screw 11 Recess 12 Contact surface 13 Annular wall 14 Screw head 15 Slot 16 End surface 17 Projection 18 Projection 19 Welding point 20 Cylinder 21 Slope 22 Slope 23 Groove 24 Groove 25 Boundary wall 26 Boundary wall 27 Bottom 28 Cylinder 29 Screw hole 30 Slope 31 Slope 32 Groove 33 Groove

Claims (11)

An annular cross-section clamp body having a first end and a second end having a first loop (7) formed by a first folded band (5) in the circumferential direction of the clamp body (2) 2) and
Including a first bolt (8) disposed in the first loop (7);
Said first bolt (8) has a circumferential surface and two opposing end surfaces;
The first bolt (8) has a recess (23, 24) disposed on a circumferential surface at a predetermined interval relative to one of the two end surfaces;
The first folded band (5) has projections (17, 18) protruding from the first folded band in a direction toward the first bolt (8) and fitted into the recesses. To clamp.   Clamp according to claim 1, characterized in that the recess (23, 24) is limited to a predetermined circumferential region.   Clamp according to claim 2, characterized in that the recess (23, 24) is a groove having a bottom that is convex or straight.   The said recess (23, 24) is a groove having a boundary wall (25, 26) in the circumferential direction, and the boundary wall extends in the radial direction at an angle of up to 45 degrees. The clamp according to 3.   Clamp according to one of claims 2 to 4, characterized in that the bolt (8) is a suspension bolt.   Clamp according to claim 5, characterized in that the recesses (23, 24) extend over a range of circumferential angles of 45 to 80 degrees. The second end has a second loop (6) formed by a second folded band (4);
The clamp further comprises a second bolt (9) disposed in the second loop (6) and having a circumferential surface and two opposing end surfaces;
The second folded band (4) has at least one protrusion protruding in a direction toward the second bolt (9), and the second bolt has a recess (32, 33);
At least one protrusion of the second folded band (4) fits into the recess (32, 33) of the second bolt (9);
The recess of the second bolt (9) is disposed at a predetermined distance from one of the end surfaces of the second bolt (9), and the circumference of the second bolt (9) 7. Clamp according to one of claims 1 to 6, characterized in that it is arranged on a surface.   Clamp according to claim 7, characterized in that the recesses (32, 33) of the second bolt (9) are circumferential grooves.   9. Clamp according to claim 7 or 8, characterized in that the second bolt (9) is a screw bolt.   The first and second bolts (8, 9) each have a bevel (21, 22; 30, 31) on at least one of the end surfaces, respectively. The clamp according to one.   The projection (17, 18) is arranged in the region of the first folded band (5) oriented towards the second end of the clamp body (2). A clamp according to claim 10.

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