Abstract 979,066. Sealing-washers. A. FISCHER. May 1, 1961 [June 21, 1960], No. 15741/61. Headings F2B and F2H. For maintaining a seal against the entry of moisture into a screwhole 1a, e.g. in a corrugated roofing sheet 1, a compression spring 5 is retained between the upper part 3c and lower part 3a of a sealing cap of synthetic resin. An extension 3i of the lower part 3a is inserted in the screwhole 1a and, after placing of the spring 5, the upper part 3c is pressed on so that its internal flange 3e snaps into a groove 3h on the lower part. A screw, Fig. 3 (not shown), is inserted through the spring and cap and screwed into the roof below the corrugated sheet and when tightened presses down the spring 5 and upper cap part 3c to the position shown. Should the screw become loose, the part 3c is moved up by the spring to maintain its seal with the screwhead.
A DEVICE FOR FASTENING CORRUGATED ROOF PANELS OF THE TYPE HAVING THROUGH BORES TO A SUPPORTING STRUCTURE, COMPRISING AN ANNULAR SEALING MEMBER HAVING A FIRST SIDE, AND A SECOND SIDE ARRANGED TO OVERLIE THE OUTER SIDE OF THE UPPER ONE OF A PLURALITY OF OVERLAPPING PANELS WHOSE BORES ARE IN REGISTRY WITH EACH OTHER SO THAT SAID SEALING MEMBER SURROUNDS THE BORE IN THE UPPER PANEL, SAID SEALING MEMBER CONSISTING OF CORROSION-RESISTANT SYNTHETIC PLASTIC MATERIAL AND HAVING AN ANNULAR GROOVE LOCATED INTERMEDIATE SAID SIDES THEREOF; BIASING MEANS INCLUDING A NUT ADJACENT TO THE FIRST SIDE OF SAID SEALING MEMBER, A RESILIENT ELEMENT INTERPOSED BETWEEN SAID NUT AND THE FIRST SIDE OF SAID SEALING MEMBER, AND A THREADED STEM MESHING WITH SAID NUT AND HAVING A PORTION ARRANGED TO EXTEND THROUGH SAID SEALING MEMBER, THROUGH THE REGISTERING BORES OF OVERLAPPING PANELS AND TO BE SECURED TO A SUPPORTING STRUCTURE SO AS TO COMPRESS SAID RESILIENT ELEMENT BETWEEN SAID NUT AND SAID SEALING MEMBER WHEREBY THE SECOND SIDE OF SAID SEALING MEMBER IS MAINTAINED IN SEALING ENGAGEMENT WITH THE OUTER SIDE OF THE UPPER PANEL; AND A CUP-SHAPED HOOD HAVING AN OPEN END PROVIDED WITH AN INWARDLY EXTENDING ANNULAR BEAD WHICH IS RECEIVED IN SAID GROOVE BY SNAP ACTION SO THAT SAID HOOD SURROUNDS SAID NUT, SAID RESILIENT ELEMENT, AND A PORTION OF SAID STEM TO PREVENT MOISTURE FROM REACHING SAID BIASING MEANS, SAID BIASING MEANS BEING OUT OF ENGAGEMENT WITH AND FREELY MOVABLE WITH RESPECT TO SAID HOOD.