# US 4,400,021 A · Reusable type hose end fitting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,400,021 A - Document ID: US4400021A - Status: Granted - Kind: A - Application number: 06/290,281 - Filed: 1981-08-06 - Granted: 1983-08-23 - Earliest claimed: 1980-08-19 - Assignees: Frederick Duffield Pty. Limited - Inventors: Frederick R. Duffield - Web page: https://patentgrep.com/patent/US4400021A ## CPC - F16L 33/223: {the sealing surfaces being pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts} - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL ## Abstract A reusable type hose end fitting comprising a through-bored stem portion and a ferrule portion which is removably screw-coupled to the stem portion. The stem portion has a first zone which is formed with a male screw thread and a second zone which locates within the bore of a hose. The ferrule portion has a first zone which is formed with a female thread for engagement with the male thread of the stem portion and a second zone which locates about the second zone of the stem portion to define a generally annular space in which an end portion of the hose locates when the fitting is assembled to the hose. The second zone of the stem portion is formed with four tapered regions and with cylindrical lands which separate adjacent ones of the tapered regions. The ferrule portion is formed in its second zone with three buttresses which are so disposed that, as the stem portion is advanced into the ferrule portion, a first one of the lands advances in an axial direction past all of the buttresses, a second one of the lands advances past two of the buttresses and a third one of the lands advances past one of the buttresses. ## Claims ### Claim 1 In a reusable-type hose end fitting having a through-bored stem portion for location in part within the bore of a hose, and a ferrule portion for location about an end portion of the hose, the stem portion having a first zone which is formed with a male screw thread and a second zone which locates within the bore of the hose when the fitting is secured to the hose end, the ferrule portion having a first zone which is formed with a female screw thread which is engageable with the male thread on the stem portion and a second zone which locates about the second zone of the stem portion to define a generally annular space in which the hose wall is located when the fitting is secured to the end portion of the hose; the improvement which is characterized in that the second zone of the stem portion is formed with at least three tapered regions which taper convergently toward the end of the stem portion, in that adjacent tapered regions are separated by a land with a length in the axial direction of the stem portion which is less than the length of the adjacent tapered regions, and in that the ferrule portion is formed in its second zone with at least two annular buttresses which are spaced apart in the axial direction of the ferrule portion by a distance approximately equal to the spacing between the lands of the stem portion and which are so disposed that, as the stem portion is advanced into the ferrule portion, each land advances in an axial direction past at least one of the buttresses. ### Claim 2 (depends on 1) An end fitting as claimed in claim 1 wherein the second zone of the stem portion is formed adjacent its end with another land. ### Claim 3 (depends on 1) An end fitting as claimed in claim 1 wherein the buttresses are so disposed that, when the ferrule portion is fully assembled to the stem portion, the buttresses do not align with the lands on the stem portion. ### Claim 4 (depends on 1) An end fitting as claimed in claim 1 wherein at least one of the lands has a width in the axial direction of the stem which is different from the width of the other lands. ### Claim 5 (depends on 1) An end fitting as claimed in claim 1 wherein the ferrule portion is formed in its second zone with three spaced-apart said buttresses, and wherein first and second ones of the buttresses are spaced-apart in an axial direction by a distance different from the spacing between the second and third ones of the buttresses. ### Claim 6 (depends on 1) An end fitting as claimed in claim 1 wherein or at least one of the lands is formed with an annular protrusion or a textured surface. ### Claim 7 (depends on 1) An end fitting as claimed in claim 1 wherein the tapered regions have a conical form. ### Claim 8 (depends on 1) An end fitting as claimed in claim 1 wherein at least one of the tapered regions has a generally conical form which is arcuate in profile. ### Claim 9 (depends on 1) An end fitting as claimed in claim 1 wherein each said land is cylindrical. ### Claim 10 In a reusable-type hose end fitting having a through-bored stem portion for location in part within the bore of a hose, and a ferrule portion for location about an end portion of the hose, the stem portion having a first zone which is formed with a male screw thread and a second zone which locates within the bore of the hose when the fitting is secured to the hose end, the ferrule portion having a first zone which is formed with a female screw thread which is engageable with the male thread on the stem portion and a second zone which locates about the second zone of the stem portion to define a generally annular space in which the hose wall is located when the fitting is secured to the end portion of the hose; the improvement which is characterized in that the second zone of the stem portion is formed with at least three tapered regions which taper convergently toward the end of the stem portion, in that adjacent tapered regions are separated by a land with a length in the axial direction of the stem portion which is less than the length of the adjacent tapered regions, in that the ferrule portion is formed in its second zone with at least two annular buttresses which are spaced apart in the axial direction of the ferrule portion by a distance approximately equal to the spacing between the lands of the stem portion and which are so disposed that, as the stem portion is advanced into the ferrule portion, each land advances in an axial direction past at least one of the buttresses, in that the crests of the buttresses have a diameter which increases in the direction of increasing diameter of the stem portion, and in that the crests of the buttresses lie around a first imaginary cone which subtends an angle .beta. which is smaller than an angle .alpha. of a second imaginary cone substantially along which the tapered regions of the stem portion are disposed.