DE8702334U1 - Clamping ring with clamping lever and tension spring - Google Patents

Description

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Clamping ring with clamping lever and tension spring

The innovation refers to a clamping ring for flange connections with at least two tendons and with

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includes.

The use of a spring element in a closure for ¹⁵ clamping rings is known from US-PS 28 46 244. The disadvantage of this design is that the desired tightness is not always guaranteed due to the high tolerances that occur with small flange connections. For example, the flanges can have different thicknesses, especially when products from different manufacturers are used. In addition, the sealing rings themselves have a different axial expansion depending on their age. These possible differences, which often accumulate, cannot always be bridged with the previously known design.

In order to eliminate the disadvantages described, it has already been proposed (DE-OS 30 46 170) to strongly bend the spring element in the clamping ring plane in order to achieve a long spring travel. As a result of the relatively long spring travel, any tolerances that occur can be compensated for by springs. However, the compensation of the maximum tolerances that occur is not possible with the previously known spring. Bs is

therefore additionally proposed in DE-OS 30 46 170, 35

the clamping lever with at least two notches for engagement of the spring element. Due to the two-stage design of the clamping lever, it is possible to increase the tolerance compensation range. An extreme case is

This occurs, for example, when flanges and seals with dimensions at the lower tolerance limit and heavily worn clamping rings are combined.

When using a two-stage clamping lever, however, there is a risk that an incorrect choice of clamping level may result in an insufficiently firm and therefore leaky

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In the worst case scenario, the lever and the spring element may also break.

The present innovation therefore has the task

The idea is to equip a clamping ring of the type mentioned above with a spring with a long spring travel and to arrange this in such a way that it does not interfere with the operation of the clamping ring.

According to the innovation, this task is solved by the fact that the spring is a spiral spring or a similar spring that can be stretched in the longitudinal direction and that it is inserted into a recess in the

clamping lever is housed. 25

The clamping levers of clamping rings of the type in question here are usually relatively long (cf. DE-OS 30 46 170). In a clamping ring with two tendons, they extend over almost the entire circumference of a clamping member and are adapted to its external shape. A relatively long spiral spring can be accommodated in an essentially hollow clamping lever of this type. A spring of this type is able to compensate for the maximum tolerances that occur with clamping rings. As a result of their placement within the The clamping lever does not interfere with the operation of the clamping ring. In addition, one-handed operation is possible because the spring and lever are connected to one another and can therefore be operated together.

Further advantages and details of the innovation will be explained using an embodiment shown in Figures 1 and 2. They show»

Fig. 1 is a perspective view of a

Clamping ring in closed position, but with raised clamping lever

and Fig. 2 a side view of the execution

example according to Fig. 1 in open

Condition.

The clamping rings 1 shown in Figures 1 and 2 have the tendons or clamping ring halves 2, 3. At both ends, the clamping ring halves 2, 3 are each provided with radially outward-facing, fork-shaped projections 4 to 7. On one side, the clamping ring halves 2, 3 are connected to each other via a tab 8 (Fig. 2), which is attached in an articulated manner between the fork-shaped projections 6 and 7. On their other side, the clamping ring halves 2, 3 each carry the closure, which essentially lent the tension spring 11 and the tension lever 12.

The clamping ring 12 is pivotably mounted in the fork 5 on the bolt 13 which is perpendicular to the clamping ring plane. The curvature of the clamping lever 12 essentially corresponds to the curvature of the clamping member 3. In the closed position of the clamping ring, the lever 12 rests against the clamping ring half 3.

The spring element 11 is designed as a spiral spring to achieve a long spring travel. It is housed in a longitudinal recess 14 in the tension lever 12. In the area of the free end of the tension lever 12, it is attached with one side by means of a pin 15.

The size of the recess 14 is selected so that the spring 11 fits completely into it. The recess is formed by a cavity in the tensioning lever 12, which is open on its outside and on its front side 16 facing the bolt 13. The cavity can also be open on the side or - preferably - on the inside of the lever 12, so that the spring 11 is protected from contact.

A hook 17 connected to the spring 11 protrudes from the front face 16 and is intended to initiate the closing process and to grip the bolt 18 in the fork 4 of the clamping ring half 2 in the closed position. The hook opening 19 faces away from the center of the clamping ring 1 so that the hook 17 grips the bolt 18 from the inside. This simplifies operation. There is no danger of the hook coming loose from the bolt during the closing process.

In the embodiments, a spiral spring is shown and described as spring 11. The spiral spring can easily be replaced by a spring with a similar effect, e.g. made of corrugated metal strip.

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Claims (9)

·" 87.002 LEYBOLD-HERAEDS GMBH S Köln-Bayenthal clamping ring with clamping lever and tension spring CLAIMS 10 1. Clamping ring for flange connections with at least two tensioning members (2, 3) and with a closure which comprises a tensioning lever (12) and a tensioning spring (11), characterized in that the spring (11) is a spiral spring or a similar spring which can be stretched in the longitudinal direction and that it is accommodated in a recess (14) in the tensioning lever (12). 2. Clamping ring according to claim 1, characterized in that the recess (14) extends in the longitudinal direction of the clamping lever (12) and is so deep that the spring (11) can be completely accommodated therein. 3. Clamping ring according to claim 1 or 2, characterized in that the clamping lever (12) is hollow and on the front side has an opening (16) in the region of its articulation point (13). 4. Clamping ring according to claim 3, characterized in that it is additionally open at the sides (inside or outside). 5. Clamping ring according to one of the preceding claims / characterized in that the clamping lever (12) and the spring (11) accommodated therein correspond in their shape to the corresponding tendon (3). ■ * t # t • ·* ·&igr; ·· tatet· '·· · · t &igr; t · ■ • tu ti · t* · 6. Clamping ring according to one of the preceding claims / characterized in that one end of the spring (11) is fixed in the region of the free end of the lever (12) and that the end of the spring (11) facing the closure is equipped with a hook (17). ?· Clamping ring according to claim 6, characterized in that the clamping members (2, 3) are fork-shaped in the region of their closure and are each equipped with a bolt (13, 18) passing through the forks (4, 5), that the clamping lever (12) is pivotally attached to the bolt (13) of the fork (5) and that the hook (17) connected to the spring (11) encloses the bolt (18) in the fork (4) when the clamping ring (1) is in the closed state. 8. Clamping ring according to claim 6, characterized in that the open side (19) of the hook (17) faces away from the center of the clamping ring (1). 9. Clamping ring according to one of claims 1 to 8, characterized in that the spring (11) which is essentially stretchable in the longitudinal direction consists of a corrugated metal band.