EP3482116A1

EP3482116A1 - Hose clamp

Info

Publication number: EP3482116A1
Application number: EP17734084.1A
Authority: EP
Inventors: Oliver LEUSNER; Gerrit Von Breitenbach; Michael Sommer; Michael Lenz; Helmut Geppert; Linda Breideband
Original assignee: Norma Germany GmbH
Current assignee: Norma Germany GmbH
Priority date: 2016-07-07
Filing date: 2017-06-29
Publication date: 2019-05-15
Also published as: CN109416142A; WO2018007238A1; JP2019522157A; DE102016112531A1; US20190219205A1; KR20190025699A

Abstract

The invention relates to a clamp (1), comprising a clamp band (2) extending in a peripheral direction (U) and a tensioning device (7) for tensioning the clamp band (2). According to the invention, in order to form the clamp (1) with yielding properties during tensioning in the simplest possible manner and in particular from a minimal number of structural components, according to the invention, the clamp band (2) has structures (11, 12) that extend at the edges (5, 6) of the clamp band.

Description

hose clamp

The present invention relates to a hose clamp with a clamp band extending along a circumferential direction and with a tensioning device for tensioning the clamp band.

STATE OF THE ART

An example of a generic hose clamp is shown in US 4,308,648 A1. The hose clamp has a clamping device with which a clamp band can be clamped, for example, around a hose end or the like. The clamping device has for this purpose a clamping screw which is rotatably received in a housing of the clamping device. In this case, by a thread of the clamping screw, the clamp band that has on its outer side a corresponding engagement geometry for the thread, in the housing of the clamping device be confiscated. When tightening then reduces the diameter of the

Hose clamp accordingly and radial clamping forces are generated.

If hose clamps are applied to rigid pipe ends or the like, it may happen, for example, in the case of severe temperature changes that the

Material elasticity of the clamp band is not sufficient, for example, in a temperature-induced expansion of the pipe end or the like

To avoid voltage overshoot in the clamp band. Likewise without a

Eigenelasticity of the clamp band, for example, falls below a

Minimum tightening force observed with a contraction of the hose or pipe, so that the hose clamp can solve if necessary.

It is known to provide additional elasticity through a corrugated area of the

To provide clamp band ready for what additional elements such as a wave spring and a Wellfederbrücke be provided. The hose clamp therefore has several items that must be joined together during manufacture. The wave spring, the wave spring bridge and a section of the clamp band must also be connected to each other. On the inside, the corrugated spring bridge serves to rest against the hose or pipe, so that the system is not interrupted by the corrugated area of the corrugated spring. Overall, this results in a complex construction with several items that must be provided for the production of the hose clamp and connected to each other.

DE 31 30 092 A1 shows an alternative embodiment of a hose clamp with a clamp band extending along a circumferential direction and with a tensioning device for tensioning the clamp band, wherein the clamp band itself has a corrugated structure. Thus, changes in diameter of the hose can be compensated, wherein by an inherent elasticity of the clamp band in

Circumferential direction, the compensation is generated. Disadvantageously distributed over the circumference of the system of the clamp band, for example, against a

Inelastic particular round body not guaranteed in terms of its full extent, but interrupted in the wavy structure. Therefore, leaks may occur in connection with high pressure lines. DISCLOSURE OF THE INVENTION

The object of the invention is the development of a hose clamp (hereinafter:

Clamp) with an extending along a circumferential direction clamp band and with a clamping device for tensioning the clamp band, the clamp should have a tight fit over a longer period of time and at changing temperatures. In particular, high tightness should be ensured.

This task is performed starting from a clamp with one extending along one

Circumferentially extending clamp band with a first edge and a

second edge as well as with a first end and a second end and with a

Clamping device for tensioning the clamp band at the first end

According to the invention solved in that the clamp band has a radially flared first structure at the first edge and at the second edge a radially flared second structure.

The invention is based on the idea of providing a modification to the corrugated structure according to the prior art in that the first structure and the second structure each extend in the axial direction, the first structure being in communication with the first edge and the second structure communicates with the second edge.

The first and the second structure additionally extend in the radial direction. This creates the opportunity for the clamp band, over the entire

Circumferential direction by means of an existing geometry between the structures to create a contact against the surface of the body over which the clamping force of the

Clamp is transmitted. The structures give the clamp band a

Inherent elasticity with regard to tensile stresses and bending stress, which is due to the shape of the structures. By this inherent elasticity can

For example, temperature-related changes in diameter of the hose or the tube can be compensated. Advantageous developments of the invention are described in the dependent claims

specified.

According to one of these advantageous developments, the first structure and the second structure are each formed by formations which repeat periodically along the circumferential direction. In this case, formations which are arranged on the first edge form the first Structure and formations disposed on the second edge, the second structure. As a result, a regular surface of the clamp band is achieved with homogeneous elastic properties. Thus, a uniform transfer of the clamping force is achieved on spanned body when clamping the clamp.

It is preferably provided that the formations in the axial direction a

have variable cross-section. In addition, it is particularly preferably provided that the radial extent of the formations is variable in the axial direction.

In particular, it is provided here that the formations extend radially outward on the outside of the clamp band. Because the formations in

Circumferentially have a variable cross-section, the elasticity of the

Clamp bands for stresses in the circumferential direction along the axial direction are different. As a result, surfaces of the bodies to be clamped which are not coplanar with the clamp band are detectable to a limited extent by the tensioning of the clamp band. As a result, the bearing surface of the clamp band

increased.

Furthermore, it is provided in an alternative embodiment that the formations of the structures in the axial direction from the respective edge over a central axis of

Clamp bands extend, wherein the formations of the first structure and the formations of the second structure in the circumferential direction are mutually arranged. An advantage of this embodiment is that the formations of the structures are arranged regularly, although the formations of the structures are arranged either on the first or on the second edge of the clamp band. Due to the regular arrangement of the formations, the distribution of the elastic properties of the clamp band in the region in which the structures are arranged is likewise homogeneous. This will be a very uniform

Transmission of the clamping force achieved on the body to exciting.

The structures are preferably arranged in a structural section of the clamp band. This advantageous embodiment makes it possible for the clamp band more

Has sections. For example, the clamp band may have a portion used to tension it.

Advantageously, the first structure of the second edge and the second structure of the first edge each have a Randbeabstandung. In addition, advantageously the formations of the first structure and the formations of the second structure in the circumferential direction in each case an intermediate spacing on each other. In addition, it is preferably provided that an amount of the edge spacings each in the

Substantially corresponds to an amount of Zwischenbeabstandungen. Particularly preferably, the edge spacings and the intermediate spacings within the structural section form a planar geometry of the clamp band.

This planar geometry is in contact with the surface of the body on which the clamp is applied. The compression, which is exerted by the tensioning of the clamp on the body, is advantageously transmitted through the planar geometry. The fact that the geometry is formed in the circumferential direction by the Zwischenbeabstandungen and the edge spacings, the geometry is continuous with mutual arrangement of the formations of the structures in the circumferential direction. As a result, a uniform determination of the body is achieved with the clamp, the clamp always rests over the entire circumference. Thus, particularly in the case that an elastic second body (for example a hose) is arranged between a first body (for example a flange) and the clamp, a fluid-tight and pressure-tight connection can be ensured. According to a further advantageous embodiment of the invention it is provided that the clamp band has at least one section without one of the structures.

Preferably, the at least one portion without one of the structures has a threaded embossment which can be arranged at the second end of the clamp band. In this case, the second end of the clamp band can run into the clamping device at the first end of the clamp band, if this for clamping the

Clamp band is operated. For this purpose, the clamping device may comprise a clamping screw and a housing, so that the entire clamp with the clamp band of at least three structural components is designed to work. The three structural components are finally formed by the clamping screw, the housing and the clamp band, which can be connected to each other by appropriate joining methods, in particular stamping and bending processes. In an alternative

Embodiment can be provided that the clamping device is formed integrally with the clamp band and can be formed by punching-bending method of the clamp band. Due to the one-piece design of the clamp band with the

Clamping device or the production of an at least three-part clamp in one Punching-bending process facilitates the manufacture of the clamp, so that advantageously the manufacturing costs of the clamp are low.

According to an advantageous embodiment, the formations of the structures are formed as conical peripheral sections. In this case, the structures at the respective edges to which they abut essentially have a waveform. The wave crests extend in the radial direction to the outside. Advantageously, the troughs do not extend inward in the radial direction. The structures may also have other shapes at the respective edges, e.g. a triangular shape or a

Trapezoidal or other polygonal shapes, which preferably extend in the radial direction to the outside. In the axial direction, the clamp band then has bulges, which are due to the shape of the structures on the respective edge and form the formations of the structures. Advantageously, it is also provided that the formations of the structures each have a notch. The notches form material recesses and are produced in a particularly preferred spanfrei. By the notches of the formations, the elasticity of the clamp band is further increased. It is preferably provided that the clamp has a central notch at least in sections along the central axis. In this case, provision is made in particular for the notch to have a width along the central axis which can be interpreted as a function of the desired stiffness matrix of the clamp. Particularly preferably, the width of the notch is less than or equal to three times the thickness or the material thickness of the clamp band. In particular, the notch is configured such that the surface of the body to be clamped can not be clamped by the edges of the notch running parallel to the central axis. The material thickness of the

Clamp bands is in particular between 0.1 mm and 1, 5 mm, preferably between 0.4 and 1, 0 mm and particularly preferably between 0.6 and 0.8 mm.

In a preferred embodiment it is provided that the clamp along the central axis is at least partially separated along a separation path. Preferably, this results in a certain flexibility of the clamp in the axial direction. This flexibility allows the clamp to better conform to an uneven surface of the body to be clamped. Preferably, the clamp has two places along the central axis at least partially on separation paths, particularly preferably, the clamp at three points along the central axis at least partially on separation paths. Advantageously, it is also provided that in the clamp band a central

Notch is formed at least in sections along the central axis, which penetrates the structures in particular. The notch increases the flexibility of the clamp in the axial direction. PREFERRED EMBODIMENT OF THE INVENTION

Further, measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. FIG. 1 shows a schematic view of a clamp with a clamp band, which with

Features of the invention is designed,

Figure 2: a detailed view of the clamp band with moldings by

Cone circumference sections are formed,

Figure 3: a detailed view of the clamp band with formations that on the

Edge of the clamp band are trapezoidal,

Figure 4: a detailed view of the clamp band with moldings, the

Have notches,

Figure 5: a detailed view of the clamp band with a notch on the

Central axis and Figure 6: A detailed view of the clamp band, a separation at the

Center axis has.

Figure 1 shows a clamp 1 with a clamp band 2, which has a first end 3, a second end 4, a first edge 5 and a second edge 6. Furthermore, the clamp has a clamping device 7 with a clamping screw 8 and the clamp band. 2 a structure section 9 and another section with a thread embossing 10. The tensioning device 7 is arranged at the first end 3 of the clamp band 2, while the threaded embossing 10 is arranged at the second end 4 of the clamp band 2. Between the first end 3 and the section with the thread embossing 10 of the structure portion 9 is arranged, within which at the first edge 5, a first structure

1 1 and the second edge 6, a second structure 12 are arranged. The structures 1 1,

12 each consist of formations 13a, 13b, which are mutually arranged in the circumferential direction U and extend from the respective edge 5, 6 on the central axis 14. The formations 13 thus extend in the axial direction A. Further, the formations 13 extend in the radial direction R while on the

Outside 15 of the clamp band 2 are arranged. The formations 13 are spaced from the respective opposite edge by a Randbeabstandung 16. The formations are spaced apart by means of an intermediate spacing 17. In the figure 1, the formations are formed as a cone peripheral portions 18.

FIG. 2 shows a detailed representation of a structure section 9 with formations 13a, 13b, which are designed as cone peripheral sections 18. The formations 13 are characterized in that they are formed on the edge 5, 6 of the clamp band 2 by a wave-shaped structure and have a variable cross-section Q. The

Edge spacing 16 and the intermediate spacing 17 form a geometry 19 which runs continuously in the structural section 9. The conical peripheral portions 18 have a certain elasticity when subjected to a stress in the circumferential direction U, so that when a band tensile force 20 is applied, the clamp band 2 is stretched along the structural portion 9.

FIG. 3 shows a detailed representation of a structure section 9 with formations 13 which are formed on the edge 5, 6 of the clamp band 2 by a trapezoidal structure 21. The trapezoidal structure 21 has rounded corners.

FIG. 4 shows a detailed representation of a structure section 9

Taper peripheral portions 18, each having a notch 22 in a region extending in the radial direction R. By the notch 22, the elasticity of the structural portion 9 is further increased. FIG. 5 shows a detailed representation of a structural section 9

Cone circumference sections 18, wherein a central notch 23 is formed parallel to the central axis 14. The notch has a width 24 which is up to three times the material thickness 25 of the clamp band 2. By the

Notching 23 increases the flexibility of the clamp band in the axial direction A.

FIG. 6 likewise shows a detailed representation of a structural section 9

Cone circumference sections 18, wherein the clamp band 2 is separated parallel to a central axis 14 along a separation path 26. The clamp band 2 may have, in addition to the separation path 26, further separation paths parallel to the central axis 14.

The invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants are conceivable, which of the illustrated solution even with fundamentally different

Designs makes use.

All from the claims, the description or the drawings

Outstanding features and / or advantages, including constructive details or spatial arrangements, may be essential to the invention both in itself and in various combinations.

Reference numeral

1 clamp

2 clamp band

3 first end

4 second end

5 first edge

6 second edge

7 Clamping device 8 Clamping screw 9 Structure section 10 Thread embossing 11 First structure

12 second structure 13a, b formations

14 central axis

15 outside

16 Randbeabstandung 17 Zwischenbeabstandung 18 Kegelumfangabschnitt 19 Geometry

20 belt tension

21 trapezoidal structure 22 notch

23 central notching 24 width

25 material thickness

26 separation path A axial direction Q cross-section

R radial direction U circumferential direction

Claims

Patentans praise

Clamp (1) with one extending along a circumferential direction (U)

Clamp band (2) with a first end (3) and a second end (4) and with a first edge (5) and a second edge (6) and with a clamping device (7) for tensioning the clamp band (2), characterized , that this

Clamp band (2) each at the first edge (5) has a radially flared first structure (1 1) and at the second edge (6) has a radially issued second structure (12).

Clamp (1) according to claim 1, characterized in that the first structure (1 1) and the second structure (12) in each case by formations (13a, 13b) are formed, which repeat periodically along the circumferential direction (U).

Clamp (1) according to claim 2, characterized in that the formations (13) in the axial direction (R) have a variable cross-section (Q).

Clamp (1) according to one of the preceding claims, characterized in that the formations (13a, 13b) of the structures (1 1, 12) in the axial direction (A) from the respective edge (5, 6) via a central axis (14) of the clamp band (2), wherein the formations (13a) of the first structure (1 1) and the formations (13b) of the second structure (12) in the circumferential direction (U) are mutually arranged.

Clamp (1) according to one of the preceding claims, characterized in that the structures (1 1, 12) in a structural portion (9) of the clamp band (2) are arranged.

Clamp (1) according to one of the preceding claims, characterized in that the first structure (1 1) of the second edge (6) and the second structure (12) of the first edge (5) each have a Randbeabstandung (16).

Clamp according to one of the preceding claims, characterized in that the formations (13a) of the first structure (1 1) and the formations (13b) of the second structure (12) in the circumferential direction each have an intermediate spacing (17) from each other. Clamp according to claims 6 and 7, characterized in that an amount of the edge spacings (16) each substantially equal to an amount of

Intermediate spacing (17) corresponds.

Clamp (1) according to one of the preceding claims, characterized in that the clamp band has at least one section without one of the structures (1 1, 12).

Clamp (1) according to claim 9, characterized in that the at least one section without one of the structures (1 1, 12) has a thread embossing (10).

Clamp (1) according to one of the preceding claims, characterized in that the formations (13) of the structures (1 1, 12) are formed as conical peripheral portions (18).

Clamp (1) according to one of the preceding claims, characterized in that the formations (13a, 13b) of the structures (1 1, 12) each have a notch (22).

Clamp (1) according to one of claims 1 to 12, characterized in that in the clamp band (2) has a central notch (23) at least partially along the central axis (14) is formed, which penetrates the structures in particular.