Roof drain insert coupling

A pipe coupling device for sealably securing a cylindrical outlet end of a roof drain insert, slidable within a larger diameter roof drain pipe, coaxially within the drain pipe,

• said coupling device comprising:
• a substantially cylindrically shaped tubular member comprising fluid impermeable, compressible, elastomeric material,
• said tube when uncompressed being axially slidable within the drain pipe, said tube having a first tubular portion of a sufficient outside diameter that on compression by axially directed compressive forces expands radially outwardly sufficiently to sealably engage with interior surfaces of said drain pipe,
• said tube having a second tubular portion of an outside diameter which when uncompressed is coaxially slidable into said outlet end of the drain insert and on compression by axially directed, compressive forces expands radially outwardly sufficiently to sealably engage with interior surfaces of said drain insert;
• two washer members, a first axially slidable within the drain pipe and a second axially slidable within the drain insert,
• said washers being axially spaced by said tube so as to sandwich the tube therebetween,
• axially extending force transmitting means coupling the two washers together for activation by activating means to apply axially directed compressive forces to said first and second portions of the tube,
• wherein in an assembled pipe coupling device, with said first portion and first washer coaxially inside the drain pipe and said second portion and second washer coaxially inside the outlet end of the drain insert, the activating means lie radially inside of the drain insert and are accessible for activation through an inlet end of the drain insert.

A pipe coupling device to couple one end of a small diameter cylindrical pipe, slidable within a larger diameter cylindrical pipe, coaxially within the larger pipe, said coupling device comprising

• a substantially cylindrically shaped member comprising compressible, elastomeric material,
• said cylindrically shaped member when uncompressed being coaxially slidable within the larger pipe and on compression thereof by axially directed compressive forces expanding radially outwardly sufficiently to sealably engage with interior surfaces of said larger pipe,
• a portion of the cylindrically shaped member being adapted when uncompressed to engage said end of the small pipe and on compression of the cylindrically shaped member by axially directing compressive forces to form a seal with said small pipe,
• means to apply axially directed compressive forces to said cylindrically shaped member actuatable by activating means which, when the cylindrically shaped member is axially disposed within the large pipe with said portion of the cylindrically shaped member engaging said small pipe, said activating means lying radially inside of the small pipe and accessible for actuation through said small pipe.

A roof drain insert with a cylindrical outlet end portion slidable into a larger diameter cylindrical drain pipe, said drain insert having coupling means to securely, slidably locate the insert coaxially within the drain pipe, said coupling means comprising;

• a radially inwardly directed flange on said outlet end of the insert,
• a tubular, ring-like member of compressible elastomeric material which when uncompressed being axially slidable within the drain pipe and on compression by axially directed compressive forces expands radially outwardly sufficiently to sealably engage with interior surfaces of said drain pipe,
• said ring having a portion on an axial end thereof to engage said flange and on compression by axially directed compressive forces tb form a seal therewith,
• a washer member slidable within the drain pipe,
• said ring member being located axially between said flange and said washer member so as to be sandwiched therebetween,
• axially extending force transmitting means coupling the washer member to the flange for activation by activating means to apply axially directed compressive forces to said ring,
• said activating means lying radially inside of the drain insert and accessible for actuation through an inlet end of said drain insert.