Hose coupling

Claim 2

A hose coupling assembly comprising a body having a bore extending axially therethrough, said body having an enlarged counterbore at one end of said bore and defining a shoulder at the junction of said bore and said counterbore, a hose having an outer diameter arranged to be freely received within said body counterbore, a nut having an aperture adapted to receive the hose therethrough, screw means on said body and said nut adapted to provide threaded engagement therebetween, a coupling sleeve having a bore therethrough adapted to receive said hose, means on said sleeve and on said body and on said nut cooperatively arranged whereby relative movement with threaded engagement of said nut and said body toward each other causes said sleeve to sealingly engage said body and at least one portion of said sleeve to constrict radially inward to bite into and grip the outer surface of said hose, and a tubular insert having a first end forming a cylindrical portion with an outer diameter substantially equal to the nominal inside diameter of the hose, radial abutment means on said insert limiting axial inward movement of said insert in said body by abutment therewith, and a second insert portion being receivable within said enlarged counterbore, said second portion having exterior radially outer surface portions defining a circle greater in diameter than one of said body bores when unrestrained and having exterior radially inner surface portions, said second portion releasably positioned within said one bore with said radially outer surface portions being resiliently deflected radially inward by bending of said exterior radially inner surface portions to segmentally engage the wall of said one bore.

Claim 3

A coupling as set forth in claim 1 wherein said second portion of said insert is proportioned tO provide a releasable press fit with said axial body bore.

Claim 4

A coupling as set forth in claim 2 wherein said second portion has wall portions defining a first diameter substantially less than the diameter of said axial body bore and said second portion has wall portions defining an external diameter slightly greater than the diameter of said axial body bore to radially position said second end portion of said insert within said axial body bore and provide said releasable press fit.

Claim 5

A coupling as set forth in claim 1 wherein said radial abutment means is intermediate said first and second portions and has one side engageable with the end of the hose on the side adjacent said first portion and has another side adapted to bear against said shoulder.

Claim 6

A hose coupling assembly comprising a coupling body having a circular inner bore defining an axis of the coupling, said coupling body having a second circular bore of larger diameter than said inner bore and coaxial with said inner bore, said second bore terminating at its inner end at an annular radial surface extending radially inward from said second bore to said inner bore, said second bore terminating at its outer end at a conical surface of said coupling body extending radially and axially outward from the second bore, said second bore adapted to receive an end of a tube therein, an annular sleeve having a through bore with an initial diameter substantially equal to the nominal outer diameter of the tube to permit it to be slipped over the tube end before the tube end is inserted in said second bore, said sleeve having an end engaging said conical surface of said coupling body when said tube is positioned in said second bore, said coupling body having external threads extending along its outer periphery concentric with said second bore, a nut having internal threads engageable with the external threads of said coupling body, said nut having a perforation therein permitting it to be slipped over the tube end prior to the placement of the sleeve on said tube, said nut having an internal recess therein permitting said sleeve to be received within said nut while said nut is threaded onto said coupling body, said nut providing a surface engageable with a portion of said sleeve allowing said nut to drive said sleeve axially forward as it is threaded onto said coupling body, said conical surface of said body camming said end of said sleeve radially inward as the sleeve is driven axially forward by said nut thereby causing said sleeve to sealingly engage said conical body surface and to radially compress said tube, and a tube reinforcing insert resisting radial compression of said tube, said insert adapted to be positioned in said coupling body before said tube is inserted in said second bore, said insert including a cylindrical tubular portion having an outer diameter substantially equal to the nominal inner diameter of the tube, said cylindrical portion extending axially outward from said second bore and said conical surface into an area of said tube encircled by said sleeve, said sleeve locking said tube on said insert when the sleeve is radially compressed, said insert including a radial shoulder extending radially outward from said cylindrical tubular portion and abutting said annular radial surface of said coupling body to axially locate said insert in said coupling body, said tubular insert having spaced points about its circumference normally defining a circle larger in diameter than the diameter of one of said body bores, said tubular insert releasably positioned within said one bore by inward radial deflection of said spaced points by bending of adjacent areas of the insert to provide segmental interferring engagement in said one bore, release of said insert from said coupling body permitting said tube to be removed from said coupling body after said tube is locked onto said insert by said sleeve.

Claim 7

A hose coupling assembly comprising a coupling body having a circular inner bore defining an axis of the coupling, said coupling body having a second circular bore of larger diameter than said inner bore and coaxial with said inner bore, said second bore terminating at its inner end at an annular radial surface extending radially inward from said second bore to said inner bore, said second bore terminating at its outer end at a conical surface of said coupling body extending radially and axially outward from the second bore, said second bore adapted to receive an end of a tube therein, an annular sleeve having a through bore with an initial diameter substantially equal to the nominal outer diameter of the tube to permit it to be slipped over the tube end before the tube end is inserted in said second bore, said sleeve having an end engaging said conical surface of said coupling body when said tube is positioned in said second bore, said coupling body having external threads extending along its outer periphery concentric with said second bore, a nut having internal threads engageable with the external threads of said coupling body, said nut having a perforation therein permitting it to be slipped over the tube end prior to the placement of the sleeve on said tube, said nut having an internal recess therein permitting said sleeve to be received within said nut while said nut is threaded onto said coupling body, said nut providing a surface engageable with a portion of said sleeve allowing said nut to drive said sleeve axially forward as it is threaded onto said coupling body, said conical surface of said body camming said end of said sleeve radially inward as the sleeve is driven axially forward by said nut thereby causing said sleeve to sealingly engage said conical body surface and to radially compress said tube, and a tube reinforcing insert resisting radial compression of said tube, said insert adapted to be positioned in said coupling body before said tube is inserted in said second bore, said insert including a cylindrical tubular portion having an outer diameter substantially equal to the nominal inner diameter of the tube, said cylindrical portion extending axially outward from said second bore and said conical surface into an area of said tube encircled by said sleeve, said sleeve locking said tube on said insert when the sleeve is radially compressed, said insert including a radial shoulder extending radially outward from said cylindrical tubular portion and abutting said annular radial surface of said coupling body to axially locate said insert in said coupling body, said tubular insert having spaced points about its circumference normally defining a circle larger in diameter than the diameter of one of said body bores, said tubular insert releasably positioned within said one bore by inward radial deflection of said spaced points by bending of adjacent areas of the insert to provide segmental interferring engagement in said one bore, release of said insert from said coupling body permitting said tube to be removed from said coupling body after said tube is locked onto said insert by said sleeve.

Claim 8

A hose coupling assembly comprising a body having a first cylindrical bore and a conical opening adjacent the outer end Of said first bore, the conical opening extending radially and axially outward from a minimum diameter adjacent the outer end of the first bore, an inner bore coaxial and communicating with said first bore, said inner bore having a smaller diameter than said first bore, an annular radial surface extending radially inward from the inner end of said first bore to said inner bore, said first bore adapted to receive the end of a tube therein, an annular sleeve having a circular through bore, said sleeve bore having an initial diameter substantially equal to the nominal outer diameter of the tube to permit the sleeve to be positioned over the exterior of the tube end, said body providing external threads on its circumference concentric with said first bore, a nut having internal threads engageable with the threads of said body, said nut having an axial hole therethrough to permit it to be positioned over the tube end prior to the positioning of said sleeve on said tube, said nut having an internal recess enclosing said sleeve while it is threaded onto said body, said nut including an internal surface engageable with a portion of said sleeve to drive the sleeve inward along the axis of said first bore as the nut is turned onto said body thereby causing a portion of said sleeve to sealingly engage said conical opening, said conical opening camming said portion of said sleeve radially inward as said nut urges said sleeve into engagement with said conical opening, a tubular insert, a first portion of said insert being releasably press fitted in said inner bore, said first portion having a cylindrical structure with an outer diameter smaller than the diameter of said inner bore, said first portion including a plurality of radial projections extending outward from said cylindrical structure and normally defining a diameter of a circle greater than the diameter of said inner bore to thereby cause interference with said inner bore when positioned therein by bending of said cylindrical structure, said first portion concentrically supporting a second portion of the insert within said first bore, said insert having an intermediate radial shoulder between said first and second portions, said shoulder engaging said annular radial surface to axially locate said insert in said body, said second portion having an outer diameter substantially equal to the nominal inside diameter of the tube to permit the tube to be slipped over said second portion into said first bore and into engagement with said radial shoulder, said second portion of said insert extending axially outward from the first bore into said conical opening and the area of the tube encircled by said sleeve, said sleeve radially compressing the tube as it is cammed radially inward, said second portion of said insert supporting said tube against substantial radial compressive deformation to thereby insure fluid tight sealing engagement between said sleeve and said tube, said tube being radially compressed into interlocking engagement with said second portion of said insert when said sleeve is permanently radially deformed, release of said first portion of said insert from said inner bore permitting removal of said tube from said first bore, said tube being removable with said insert and said sleeve as a reuseable assembly.

Claim 9

A hose coupling assembly comprising a body having a first cylindrical bore and a conical opening adjacent the outer end Of said first bore, the conical opening extending radially and axially outward from a minimum diameter adjacent the outer end of the first bore, an inner bore coaxial and communicating with said first bore, said inner bore having a smaller diameter than said first bore, an annular radial surface extending radially inward from the inner end of said first bore to said inner bore, said first bore adapted to receive the end of a tube therein, an annular sleeve having a circular through bore, said sleeve bore having an initial diameter substantially equal to the nominal outer diameter of the tube to permit the sleeve to be positioned over the exterior of the tube end, said body providing external threads on its circumference concentric with said first bore, a nut having internal threads engageable with the threads of said body, said nut having an axial hole therethrough to permit it to be positioned over the tube end prior to the positioning of said sleeve on said tube, said nut having an internal recess enclosing said sleeve while it is threaded onto said body, said nut including an internal surface engageable with a portion of said sleeve to drive the sleeve inward along the axis of said first bore as the nut is turned onto said body thereby causing a portion of said sleeve to sealingly engage said conical opening, said conical opening camming said portion of said sleeve radially inward as said nut urges said sleeve into engagement with said conical opening, a tubular insert, a first portion of said insert being releasably press fitted in said inner bore, said first portion having a cylindrical structure with an outer diameter smaller than the diameter of said inner bore, said first portion including a plurality of radial projections extending outward from said cylindrical structure and normally defining a diameter of a circle greater than the diameter of said inner bore to thereby cause interference with said inner bore when positioned therein by bending of said cylindrical structure, said first portion concentrically supporting a second portion of the insert within said first bore, said insert having an intermediate radial shoulder between said first and second portions, said shoulder engaging said annular radial surface to axially locate said insert in said body, said second portion having an outer diameter substantially equal to the nominal inside diameter of the tube to permit the tube to be slipped over said second portion into said first bore and into engagement with said radial shoulder, said second portion of said insert extending axially outward from the first bore into said conical opening and the area of the tube encircled by said sleeve, said sleeve radially compressing the tube as it is cammed radially inward, said second portion of said insert supporting said tube against substantial radial compressive deformation to thereby insure fluid tight sealing engagement between said sleeve and said tube, said tube being radially compressed into interlocking engagement with said second portion of said insert when said sleeve is permanently radially deformed, release of said first portion of said insert from said inner bore permitting removal of said tube from said first bore, said tube being removable with said insert and said sleeve as a reuseable assembly.