Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1998-12-23
2001-07-31
Dye, Rena L. (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S036900, C428S036910, C138S177000, C138S178000, C277S630000, C277S645000, C277S649000, C277S906000, C156S244150, C156S244130, C264S209300, C264S209600
Reexamination Certificate
active
06268031
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is related to an injection hose having a continuous hollow extrusion made of elastically resilient material, comprising a continuous longitudinal conduit and at least one continuous longitudinal groove which communicates with the longitudinal conduit through apertures in the bottom of the groove and which is delimited by lateral groove sides and is open at a groove opening, and comprising a sealing string made of rubber-elastically flexible, preferably compressible, material, one each of which is disposed in the at least one longitudinal groove, which is held in the groove by retaining means, and which extends over the apertures. The invention is further related to a method for the production of such an injection hose.
2. Description of the Related Art
Injection hoses of this type are predominantly used to permanently seal construction joints and expansion joints of structures, in particular of concrete structures. To this end the injection hose, which is inserted into the joint when the concrete is poured, is subjected by way of the longitudinal conduit to a pressurized hardenable liquid or pasty sealant in such a manner that the sealant is injected into the joint through the apertures while the sealing string is lifted off from the apertures. An injection hose of this type is known (EP-A-0 522 327), in which the retaining means for sealing strings loosely inserted into the longitudinal grooves are formed by a stocking which is drawn over the profile extrusion and which is made of a thin material which is permeable to liquid or which disintegrates under the influence of the injection liquid. The drawing of the retaining stocking over the loosely inserted sealing strings and the fixation of the retaining stocking at the end of a length of the profile extrusion has proven to cause considerable production difficulties, which increases the cost of the product. This disadvantage is most noticable when the profile extrusion has a non-circular cross section. Further, the handling of the profile extrusion covered with the retaining stocking is awkward in practice.
SUMMARY OF THE INVENTION
Based on this it is the object of the invention to develop an injection hose of the type described above as well as a method for its production, with which the production is simplified without resulting in functional disadvantages and the handling of the injection hose is improved.
The solution according to the invention is based on the thought that it is possible to do without the retaining stocking altogether without functional disadvantages when the profile extrusion is suitably designed. In order to achieve this, it is proposed according to the invention that the opening width of the groove opening is smaller than the diameter of the sealing string in its relaxed state, and that the retaining means are formed by undercuts in the groove sides of the longitudinal groove. With these measures it is attained that the sealing string is clamped sufficiently securely within the longitudinal groove due to its elasticity, so that it is not lost when the injection hose is wound onto a transport roll, when it is removed from the transport roll, and when it is handled. The sealing string seals off the longitudinal conduit from external moisture, while it opens an output gap for the sealant when the longitudinal conduit is subjected to pressurized liquid sealant, without itself being forced out of the longitudinal groove. By this it is also ensured that the output gap is automatically closed after the injection process is completed, so that the longitudinal conduit can be evacuated without moisture entering from the outside.
According to a preferred embodiment of the invention it is provided that the diameter of the sealing string is larger than the depth of the longitudinal groove, so that a portion of the sealing string inserted into the longitudinal groove protrudes radially over the groove opening while being constricted by the edge of the groove. Advantageously, the groove sides are to this end curved in profile in a hook-like manner toward the inside of the groove in the region of their opening-side edges. In principle it is also possible that the groove sides are to this end formed as dovetailed undercuts.
A further preferred embodiment of the invention provides for at least one further longitudinal groove which is closed with respect to the longitudinal conduit, is undercut at its sides, and is outwardly open, in which groove there is disposed in a form-fitting manner an elastically resilient, flexible sealing strip which is made of a material which swells when absorbing water. With such sealing strips it is achieved that when water enters a joint the sealing strip swells out from the corresponding groove and seals the joint from water breakthrough.
The profile extrusion expediently has a multi-sided, preferably triangular profile, at the profile corners of which are disposed the longitudinal grooves which are provided with the wall apertures and are fitted with the sealing strings, the longitudinal conduit being disposed centered within the profile extrusion. In this embodiment the longitudinal grooves which are closed toward the longitudinal conduit and are fitted with the swelling sealing strips are expediently disposed in the sides of the profile extrusion.
While the profile extrusion is expediently made of a caoutchouc, preferably of EPDM-caoutchouc, the sealing strings are expediently made of compressible sponge rubber. The sealing strips which swell up under the influence of water may consist of rubber with swellable additives such as urethane resin, polyvinyl alcohol or acrylic resin.
For the production of the injection hoses the method according to the invention provides that the profile extrusion consisting of caoutchouc is extruded over a mandrel, which creates the longitudinal conduit, while fashioning the undercut longitudinal grooves and is subsequently vulcanized and cooled, that before or during the vulcanization process spaced apertures are pressed, under displacement of material, into at least part of the longitudinal grooves of the profile extrusion which is transported over the mandrel. Then sealing strings and/or sealing strips are continuously supplied from the side to the profile extrusion which has been pulled off from the mandrel and cooled off and are pressed or rolled into the corresponding longitudinal grooves. The flexible profile extrusion prepared in this manner is then wound onto transport rolls in portions and cut to length.
REFERENCES:
patent: 4722479 (1988-02-01), Koob
patent: 4802938 (1989-02-01), Kitami et al.
Lewis, Richard J., Hawley's Condensed Chemical Dictionary, Thirteenth Edition, John Wiley and Sons, Inc., p. 205, 1997.
Dye Rena L.
Pendorf & Cutliff
Sika AG, vormals Kaspar Winkler & Co.
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