DE29710939U1 - Device for fixing seals - Google Patents

Description

Device for fixing seals

The invention relates to a device for fixing drawn-in seals extending over the profile length of plastic frame profiles made of a weldable material, in particular a thermoplastic, for windows, doors or the like, wherein the seals are formed by a sealing base and at least one sealing lip, of which at least the sealing lip can be covered on the inside or outside by a mold bar of the device during the welding process.

The production of window frames, blind frames, door frames or similar from plastic profile parts is carried out by welding profile pieces. The individual frame profiles, preferably pre-cut at a mitre, are laid out on support surfaces, for example on a table of a welding unit and fixed by clamping units. A welding mirror is then placed between

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two frame profiles are inserted to heat the miter surfaces of the frame profiles to be welded. After the welding mirror is withdrawn, the frame profiles are then pushed together in the heated state, whereby the actual welding takes place. After the frame profiles have cooled down, a firm connection is formed between them. By heating the miter surfaces to be welded and the adjacent frame profile areas of the frame profiles, the material in these areas becomes relatively soft and flowable. If the frame profiles are then pushed together, the material is displaced sideways, whereby so-called welding beads then form on the surface of the frame profiles.

If, for example, a window frame is to be formed from the frame profiles that interacts with a casement, it is desirable to provide an elastic seal on the outer surface in order to improve the tightness in this area. If the seal is inserted after the welding process, it is necessary to machine the groove provided for the seal, cut the seal accordingly and then insert it into the groove. To reduce the number of work steps, the seals are inserted into the groove provided for this purpose in the frame profiles before welding. Accordingly, welding beads then form in the area of the seals drawn into the groove, which mix with the plasticized displacement material of the frame profiles. This then results in a block-like, essentially inelastic area, through which the elastic properties of the seals in the corner area are then considerably reduced or even completely eliminated. The area outside this hardened

If the seal has full elasticity and spring effect in the corner area, the tightness of windows between the frame and sash cannot be guaranteed due to the lack of form-fitting and elasticity in the seal corner area. The inelastic and pre-formed seal corner can no longer follow tolerances caused by fittings, for example, and thus leads to leaks in the corner area and to deformations of the frame profiles and fittings.

Furthermore, the seals may shift during the welding process, so that they no longer lie against each other in the area of the miter surfaces and the necessary tightness in this area is no longer guaranteed. Shifting the seals may also cause the seals to overlap in the miter area, so that parallel welding of the seals is no longer possible, which also has a negative effect on the sealing properties. For this reason, devices or tools have already been provided in which laterally projecting shaped bars are inserted under the sealing lip of the seal in order to at least partially cover and fix the seal in this area. The shaped bars are then spaced from a lower cover of the seal by a narrow gap that is larger than the thickness of the sealing lip. This should then also protect the lower area of the seal as much as possible.

Since the frame profiles to be welded still have to be aligned against each other in the welding unit, such tools and thus their form bars can only be spaced apart

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inserted into the seals at the mitre ends

so that there are still large tolerances in the direction of the mitre ends. This then leads to welding
that the rubber of the seal, as already
said, is adversely affected during welding. Furthermore, it cannot be reliably ruled out that the welded seal will be destroyed when the welding unit is opened and subsequently moved apart,
because it is closely surrounded by the mold bar of the lower cover of the tool.

The invention is therefore based on the object of
To further develop the device of the type mentioned above in such a way
that on the one hand the seal is reliably fixed during the welding process and on the other hand the subsequent destruction of the welded seal when opening the
welding unit is reliably excluded.

According to the invention, the above object is achieved by a
Device of the type mentioned above, which is characterized by a clamping part spaced apart from the stationary mold bar in the initial position by a gap
is that to clamp the seal in the direction
of the molded bar can be displaced essentially vertically against a restoring force and can be returned to its initial position by the restoring force. According to the invention, there is therefore enough clearance before the clamping part is displaced to fix the molded bar to the seal for
system, since the seal is only clamped when the device or tool is actuated
The vertically adjustable clamping part
is therefore correspondingly a larger gap than
possible with the state of the art, so that the alignment of the frame profiles to be welded can still be reliably

1 without the previously necessary tolerances when attaching the form bar. The fixing and clamping of the seal during the welding process is reliably secured by the clamping part that is moved vertically upwards in the direction of the form bar. The welded seal cannot be destroyed when the welding unit is opened, as the clamping of the seal is undone beforehand by loosening the clamping part.

Furthermore, it is possible to cover the mitred ends of the seals at least partially with the shaped bar and the clamping part during welding so that no welding beads can form in this sealing area, which would reduce the elasticity of the seal.

Preferably, an actuating element is provided on the top of the device serving as a welding support and is mechanically connected to the clamping part. By using the welding support as a device for fixing, the number of components required for the welding devices or the welding unit is reduced.

Because the actuating element is arranged on the top of the welding support, the seal can be clamped easily from above by actuating it using the upper clamping unit, which is applied in a known manner to clamp the frame profiles. Before the welding unit moves apart after the welding process, the profile tension and thus the clamping of the seal are released in a known manner. This then creates a

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non-destructive opening of the welded seal when opening the welding unit. The welding support or the device for fixing is operated purely mechanically by the profile clamping unit, no additional cylinders are required for power transmission or for introducing the clamping force.

In a preferred embodiment, the actuating element is formed by an actuating plate that protrudes upwards from the welding allowance in the rest position, which can be moved into the interior of the tool against a restoring force when pressure is applied and can be returned to its rest position when the restoring force is released. The seal is therefore clamped solely by applying pressure to the actuating plate, which automatically returns to its starting position when the clamping unit is released and thus releases the seal of the frame profile via the clamping part.

Of course, the pressure can also be applied to the actuating plate using another suitable device, but it is preferably done using clamping units attached to the plastic frame profiles.

In order to transfer the downward movement of the actuating plate to the clamping part that is to be moved upwards, two toothed racks connected via a gear wheel, each of which is connected to the clamping part or the actuating plate, are preferably provided. In this way, a downward movement of the actuating plate caused by the application of the upper clamping unit is transferred to the clamping part simply and directly. The direction of movement of the actuating plate

and clamping part are then parallel to each other or opposite to each other.

In order to be able to apply the restoring force required to reset the actuating plate, a bolt surrounded by a return spring and running parallel to the rack is arranged on the underside of the actuating plate. A return spring is also provided on the underside of the clamping part. This makes it easy and reliable to reset the actuating plate and clamping part, as the return spring of the actuating plate is compressed when lowered and the return spring of the clamping part is tensioned when raised, so that when the tensioning units are released, the actuating plate and the clamping part are easily returned to their original position by the return springs, which are now relaxing or rebounding.

The spring on the underside of the clamping part also serves to elastically hold the clamping piece in place in the direction to be fixed so that it is not damaged during clamping.

The return or retraction springs are preferably those with high rigidity, i.e. hard springs.

In a preferred embodiment, the clamping part also serves to cover the outer contour of at least a part of the seal. Accordingly, reliable protection of the outer contour of the seal is also ensured during the welding process, so that

No welding beads that reduce elasticity can form in this sealing area.

In a further development, it is provided that the shaped bar can be inserted between the sealing base and the sealing lip. While the clamping part then protects the outer contour of the seal, the inner contour is protected by the shaped bar. The shaped bar is preferably designed in the form of a laterally protruding nose that has the inner contour of the seal. Such a nose can be easily inserted between the sealing base and the sealing lip, especially when the clamping part is spaced apart in the unloaded state. The clamping part then has a course that corresponds to the outer contour of the seal on its upper side facing the shaped bar.

Alternatively, it is also possible for the shaped bar to be designed to be form-fittingly attached to the outside of at least the sealing lip. Accordingly, the shaped bar then ensures reliable protection during the welding process, particularly when the sealing lip protrudes in the direction of the frame profile, and also prevents the welded sealing corners from tearing open when the welding unit is opened. In a further development, the shaped bar is designed in the form of a nose that protrudes downwards in the direction of the clamping part and has the outer contour of the seal. The clamping part then serves to clamp and fix the seal and to cover the part of the seal not covered by the shaped bar.

In any case, for reliable clamping and covering, the clamping part must cover the molded bar

protrudes laterally in the direction of the plastic frame profiles.

Overall, this reliably ensures that the seal cannot be displaced during the welding process, as it is reliably secured by a vertically movable clamping part and a stationary form bar. The plastic frame profiles can be inserted into the welding unit in a simple manner, as the clamping part of the welding support remains in its initial position at a distance from the form bar during the insertion process. Only when the upper clamping unit, which clamps the plastic frame profiles to be welded, is placed on top, is the necessary clamping force applied to move the clamping part in the direction of the form bar, so that the seal is only clamped at this moment for the subsequent welding process. The fact that the welding unit only moves apart after the welding process after the profile tension has been released and thus the seal has been clamped, reliably prevents the welded seal from being destroyed when the welding unit is opened.

Further advantages and features of the invention emerge from the claims and from the following description, in which exemplary embodiments are explained with reference to the drawings. In this figure:

Figure 1 shows a longitudinal section through an inventive

0 device according to the invention in the form of a

welding allowance;

Figure 2 a plan view of the device

from Figure 1;

ri

Figure 3 shows a cross section through a first

Embodiment of a molding bar and clamping part of the device according to the invention and

Figure 4 shows a second embodiment of a

Clamping part and molded bar of the device according to the invention.

Figures 1 and 2 show a welding support 1 and a device according to the invention for fixing seals for frame profiles not shown in the drawings in longitudinal section and in plan view.

The welding allowances 1 are placed laterally on the frame profiles to be welded.

To produce a frame corner, the frame profiles are placed on a table of a welding unit (also not shown) and held at the top and bottom using clamping units.

The device or welding support 1 according to the invention has a shaped bar 3 or 3' on the side of its housing 2 (see in particular Figures 3 and 4), which is arranged in a fixed position on the housing 2.

As can be seen from Figure 2, both the shaped bar 3 and the welding allowance 1 have bevelled end faces 4 in the direction of the weld seam or the miter plane. This then forms a point in the area of the weld seam of the frame profiles to be welded together.

As can be seen from Figures 1, 3 and 4, a vertically displaceable clamping part 5, 5' is arranged below the mold bar 3, 3'. In its initial position, this clamping part 5, ⁵ ' is spaced from the mold bar 3, ³ ' by a gap 6, 6'.

A highly rigid return or retraction spring 7 is arranged on the underside of the clamping part, which is mounted in a receptacle 8 provided in the housing 2.

At the longitudinal end facing away from the miter end 4, the clamping part 5 is firmly connected to a rack 9, which can be displaced essentially straight and linearly in a through hole 10 in the housing 2 that serves as a longitudinal guide. The rack 10 is in engagement with a gear 11 in the lower area of the housing 2, which in turn is in engagement with a second rack 12 on the side facing away from the rod 9. This second rack can in turn be displaced essentially linearly and vertically in a through hole 13 in the housing 2 that serves as a longitudinal guide. Furthermore, the two racks 9 and 12 are arranged parallel to one another in the housing 2.

As can be seen from Figure 1, the rack 9 is raised via the gear 11 when the rack 12 is lowered and lowered accordingly when the rack 12 is raised. When the rack 9 is raised, the clamping part 5 connected to it is also raised vertically in the direction of the mold bar 3 against the spring action of the retraction spring 0 or return spring 7.

The rack 12 is secured with its upper end to an actuating plate 14, for example by screwing. This actuating plate 14 is within

a receptacle 5 formed on the top of the housing and in the rest position protrudes upwards over the top of the housing 2. A bolt 17 surrounded by a return or retraction spring 16 is arranged on the side of the rack 12 and is arranged so that it can be moved in a bore 18 parallel to the through-hole 13. In its upper area, the through-hole 18 has an extension 19, in the area of which the bolt 17 is surrounded by the return or retraction spring 16 and is thus supported.

The actuating plate 14 is lowered downwards by applying pressure from above into the receptacle 15 in the upper part of the housing against the spring action of the retraction or reset spring 16, whereby the rack 9 is raised upwards via the gear 11 due to the simultaneously lowered rack 12. The clamping part 5 is then raised upwards in the direction of the mold bar 3 against the restoring force of the retraction or reset spring 7. The pressure actuation of the actuating element 14 is preferably carried out by means of the upper clamping unit to be applied to the frame profiles, so that this state is reliably guaranteed during the entire welding process. After removing the clamping unit, the actuating element 14 is then raised by the restoring forces of the retraction or reset springs 16 and 7 and the clamping part 5 is lowered downwards accordingly due to the mechanically acting connection.

Figures 3 and 4 show two embodiments of the shaped bars 3, 3' and clamping parts 5, 5 ^' . The arrangement in Figure 3 serves to clamp and cover a seal 20, which is secured by a sealing base

21 and a sealing lip 22 is formed, the sealing lip 22 protruding outwards with its free ends away from the frame profile.

In the embodiment shown in Figure 3, the shaped bar 3 is designed in the form of a laterally projecting nose that can be pushed into the seal 20 from the side and covers its inner contour in a form-fitting manner. For this purpose, the shaped bar 3 has a flat, essentially horizontal upper side 24 and on its underside two legs 25, 26 that are angled towards one another and have a different bevel and taper towards one another at the bottom. The clamping part 5 has a plane 27 on its upper side that runs parallel to the leg 26 to cover the outside of the sealing lip 22 and to clamp the seal 20 to the stationary shaped bar 3. As can also be seen from Figure 3, the clamping part 5 projects laterally over the shaped bar 3.

In the embodiment shown in Figure 4, the seal 20, which is again formed by the sealing foot 21' and sealing lip 22', now has a sealing lip 22■ directed inwards in the direction of the frame profiles. Furthermore, the sealing foot is provided with an extension 23 in the direction of the frame profile. In order to clamp and cover this seal 20', the molded part 3' is now designed in the form of a downwardly projecting nose and has on its lateral outside two legs 28, 29 that taper inwards towards each other, which form a support surface for the outside of the sealing lip 22'. The angle of these two legs 28, 29 that taper inwards or the bevel is such that the seal 20' with its

The outside of the sealing lip 22' rests positively on the shaped bar ^31. On its underside 30, the shaped bar 3', which projects downwards in the form of a nose, is essentially flat and runs horizontally. 5

The clamping part 5, which is spaced apart from the shaped bar 3' by the gap 6', has a substantially box-shaped receptacle 31 in alignment with the downwardly projecting nose or shaped bar 3'. Here, too, the shaped bar 3' is laterally projected over by the clamping part 5', with an upwardly projecting shoulder being formed on the lateral end of the clamping part projecting over the shaped bar 3' to the side of the receptacle 31', which shoulder has a surface 32 that is beveled from top to bottom and outwards in the direction of the frame profile. The underside of the extension of the seal 20' rests on this surface in a form-fitting manner when clamped.

As can also be seen from Figures 3 and 4, the gaps 6, 6' between the molded bar 3, 3' and the clamping part 5, 5' are selected in such a way that even after the clamping part 5, 5' has been completely lifted, these gaps are not completely closed. The return or retraction spring 7 arranged on the underside of the clamping parts 5, 5' also ensures a reliable but also resilient connection, depending on the thickness of the seal 20, 20', so that the seal 20, 20' cannot be damaged.

Claims (15)

Protection claims Device for fixing drawn-in seals extending over the profile slopes of plastic frame profiles to be welded and made of a weldable material, in particular a thermoplastic for windows, doors or the like, wherein the seals are formed by a sealing foot and at least one sealing lip, of which at least the sealing lip on the inside or outside can be covered by a mold bar of the device during the welding process, characterized by a clamping part (5, 5') which is spaced apart from the stationary mold bar (3, 3') in the starting position by a gap (6, 6 ¹ ) and which can be displaced essentially vertically in the direction of the mold bar (3, 3') against a restoring force in order to clamp the seal (20, 20') and can be returned to its starting position by the restoring force. 2 -· 2. Device according to claim 1, characterized by an actuating element (14) arranged on the upper side of the device (1) serving as a welding support and mechanically connected to the clamping part (5, 5'). 3. Device according to claim 2, characterized in that the actuating element (14) is formed by an actuating plate which, in the rest position, protrudes upwards from the welding supplement (1), which, when pressure is applied, can be displaced into the interior of the welding supplement (1) against a restoring force and, when the load is released, can be returned to its rest position by the restoring force. 4. Device according to claim 3, characterized in that the pressure is exerted on the actuating plate (14) by clamping units applied to the plastic frame profiles for clamping the latter. 5. Device according to one of claims 1 to 4, characterized by two racks (9, 12) connected via a gear wheel (11), which are each connected to the clamping part (5, 5') or the actuating plate (14). 6. Device according to one of the preceding claims, characterized by a bolt (17) on the underside of the actuating plate (14) which is surrounded by a return or restoring spring (16) and runs parallel to the rack (12). 7. Device according to one of the preceding claims, characterized by a on the underside of the Return or retraction spring (7) arranged in the clamping part (5). 8. Device according to one of claims 6 or 7, characterized in that the return or retraction springs (7, 16) have a high rigidity. 9. Device according to one of claims 1 to 8, characterized in that the clamping part (5, 5') serves to cover the outer contour of at least part of the seal (20, 20'). 10. Device according to one of claims 1 to 9, characterized in that the molded bar (3) can be inserted between the sealing base (21) and the sealing lip (22). 11. Device according to claim 11, characterized in 0 net that the shaped bar (3) is designed in the form of a laterally projecting nose having the inner contour of the seal (20). 12. Device according to one of claims 10 or 11, characterized in that the clamping part (5) has on its upper side (27) facing the molded bar (3) a course corresponding to the outer contour of the seal (20). 13. Device according to one of claims 1 to 9, characterized in that the shaped bar (3') is designed to be placed in a form-fitting manner on the outside of at least the sealing lip (22'). 14. Device according to claim 13, characterized in that the shaped lock (3 ¹ ) is designed in the manner of a nose projecting downwards in the direction of the clamping part (5 ') and having essentially the outer contour of the seal (20 '). 15. Device according to one of the preceding claims, characterized in that the clamping part (5, 5') projects laterally beyond the molded bar (3, 3') in the direction of the plastic frame profile.