초록 ▼

A water tank T of plastic material which is joined by using at least two open and identical tank parts 1 and a joining plane 2, the tank parts having respective opening structures R with a flattened inner opening edge, a sealing channel 26 being open towards the joining plane, and an outer flattened

A water tank T of plastic material which is joined by using at least two open and identical tank parts 1 and a joining plane 2, the tank parts having respective opening structures R with a flattened inner opening edge, a sealing channel 26 being open towards the joining plane, and an outer flattened opening edge, the inner and outer opening edges within the opening edge structure are situated in each tank part 1, 35 in the joining plane 2, the opening edge at the same time defining inner and outer fitting surfaces 16, 17, respectively with a width exceeding the thickness X of the tank part wall 30 and the sealing channel wall 34 by at least about the half, such that the water tank T selectively can be manufactured from the same tank parts 1, 35 either monolithically by welding the fitting surfaces 16, 17 without sealing means in-between to each other or separable by clamping the opening edge structures R from the outer side with sealing means 33 provided between both tank parts 1, 35.

대표청구항 ▼

The invention claimed is: 1. A water tank made from plastic material, which water tank is to be joined from at least two open identical injection molded or injected molded and embossed tank parts, the tank parts having opening edge structures matching each other in a joining plane of the water tank

The invention claimed is: 1. A water tank made from plastic material, which water tank is to be joined from at least two open identical injection molded or injected molded and embossed tank parts, the tank parts having opening edge structures matching each other in a joining plane of the water tank, each opening edge structure having a flat inner opening edge continuing a wall of the tank part, a sealing receiving channel for a sealing means, the sealing receiving channel being open towards the joining plane, and an outer flat opening edge continuing a wall of the sealing receiving channel, the opening edges being aligned with each other in the joining plane in joined condition of the water tank and being inner and outer fitting surfaces respectively with a width exceeding the thickness of the wall of the tank part and the wall of the sealing receiving channel by at least about one half, the opening edge structures being designed such that the water tank is to be assembled in a separable watertight tank version by local releasable clamping joining of the opening edge structures, wherein the water tank at least substantially has a shape of a hollow cylinder consisting of substantially semi-cylindrical tank parts each having outwardly rounded end caps, wherein a cylinder axis is situated in the joining plane, ribs in each tank part being arranged parallel to each other in both end caps and in the semi-cylindrical parts with the ribs formed in the end caps terminating with a respective distance from the first and last ribs of the semi-cylindrical parts, and wherein the ribs are tapering inwardly and define at each rib end a closed, substantially trapezoidal or triangular cross-section within the opening edge structure, wherein an extension of the inner fitting surface defined by each rib end has a shape of a closed strip following a shape of the rib cross-section and having substantially constant width, the edge strip surrounding a recess which is set back in relation to the joining plane, and wherein an insertion socket for inserting a centering member is formed in the recesses of the rib ends of at least some of the ribs. 2. A water tank according to claim 1, wherein the plastic material is HDPE or PP (high density polyethylene or polypropylene). 3. A water tank according to claim 1, wherein the opening edge structure is provided with clamping skewbacks along a circumference, the clamping skewbacks being located directly at an outer side of the outer fitting surface or at spaced part locations at a prolonging flange extending adjacent to the outer fitting surface. 4. A water tank according to claim 1, wherein a round dome boss is formed into the semi-cylindrical part substantially midway between the end cap halves, the ribs of the semi-cylindrical part being interrupted in the dome boss and that the dome boss contains a cover lid which is parallel to the joining plane and which extends substantially flush with an outer contour of the end cap halves. 5. A water tank according to claim 4, wherein a separation wall holding pocket is formed between respective two ribs in the semi-cylindrical part of the tank part, the holding pocket being open in the joining plane wherein within at least one separation wall holding pocket between two of the ribs of the semi-cylindrical part at least one sealing holding web is formed, the sealing holding web extending across an inner side of the cover lid in the dome boss and terminating in the joining plane as a supplemental extension of the inner fitting surface.