Take-off duct coupler

Claim 2

A coupling device comprising a first ring collar having (a) a rearward flange, (b) an intermediate, substantially cylindrical portion and (c) a forward, neck portion constituting a concavoconvex ring wall which is substantially a frustohyperboloid; a second ring collar having (a'') a rearward ring portion of larger diameter than that of said intermediate, substantially cylindrical portion, (b'') an intermediate portion constituting a concavo-convex ring wall whiCh is substantially a frustohyperboloid substantially mating with said ring wall constituting said neck portion to provide a close, sealing fit therebetween, and (c'') a forward, substantially cylindrical coupler portion adapted for coupling thereon a take-off duct; first and second bridge means respectively extending diametrically across said intermediate portion (b) and said coupler portion, apertures in the center portions of said bridge means, and fastening means extending through said apertures to draw said collars together with said neck portion (c) and said intermediate portion (b'') in coaxial, sealing contact.

Claim 3

An air supply duct having a planar wall with a round air take-off hole therein, said planar wall being relatively soft fiber glass material, and a coupling device mounted in said hole, said coupling device constituting a first ring collar having (a) a rearward flange, (b) an intermediate, substantially cylindrical portion and (c) a tapered, forward, neck portion; a second ring collar having (a'') a rearward ring portion of larger diameter than that of said intermediate, substantially cylindrical portion, (b'') an intermediate portion with a taper substantially mating with the taper of said neck portion to provide a close fit therebetween, and (c'') a forward, substantially cylindrical coupler portion adapted for coupling thereon a take-off duct; and connecting means joining said collars for drawing together said collars with said neck portion (c) and said intermediate portion (b'') in coaxial, close fitting relationship, said planar wall having substantially diametrically opposed, narrow slits cut therein adjacent said hole by said flange when said first ring collar is placed at an angle relative to the plane of said hole and pushed therethrough, said rearward flange (a) being seated against the inner face of said wall about said hole and with said rearward portion (a'') positioned substantially against the outer face of said wall about said hole.

Claim 4

An air supply duct having a planar wall with a round air take-off hole therein, said planar wall being relatively soft fiber glass material, and a coupling device mounted in said hole, said coupling device constituting a first ring collar having (a) a rearward flange, (b) an intermediate, substantially cylindrical portion and (c) a tapered, forward, neck portion; a second ring collar having (a'') a rearward ring portion of larger diameter than that of said intermediate, substantially cylindrical portion, (b'') an intermediate portion with a taper substantially mating with the taper of said neck portion to provide a close fit therebetween, and (c'') a forward, substantially cylindrical coupler portion adapted for coupling thereon a take-off duct; and connecting means joining said collars for drawing together said collars with said neck portion (c) and said intermediate portion (b'') in coaxial, close fitting relationship, said planar wall having substantially diametrically opposed, narrow slits cut therein adjacent said hole by said flange when said first ring collar is placed at an angle relative to the plane of said hole and pushed therethrough, said rearward flange (a) being seated against the inner face of said wall about said hole and with said rearward portion (a'') positioned substantially against the outer face of said wall about said hole.