Plastic pipe bending jig

{
  "publication_number": "US3776539A",
  "country": "US",
  "kind": "A",
  "title": "Plastic pipe bending jig",
  "abstract": "A plastic pipe bending jig for establishing bend curvature and configuration having a plurality of operatively interconnected arms, pipe receiving clamps connected to the radial extremities of such arms, such clamps being radially and angularly adjustable to the desired radius and angle of curvature for the pipe, and indicia associated with the jig for determining such radial and angular displacement of the clamps. The jig is used by adjusting the clamps to define the desired pipe configuration, heating the pipe until pliable and placing the same in the clamps until hardened.",
  "claims": [
    "1. A jig positionable on a flat support surface to facilitate the bending of heat softenable plastic pipe to a given curvature over a curved section heated to the softening temperature of said pipe and having curved section ends comprising interconnected spaced-apart straight elongated guides positionable on said support surface to hold said pipe at and beyond said curved section ends with said curved section supported on said support surface between said guides until said curved section cools to the hardening temperature of said pipe so that said guides establish tangential straight segments of said pipe beyond said curved section ends with said straight segments being tangent to said curved section at said curved section ends, a pair of elongated support arms having outer arm ends, said arms being attached to support means, said guides being attached to said outer arm ends, radial adjustment means for radially adjusting said arms relative to said support means, at least one of said arms being angularly adjustable relative to said support means for angular movement toward and away from the other of said arms, and at least one of said guides attached to one of said arm ends being angularly adjustable about a substantially vertical axis relative to said one arm end.",
    "2. The jig of claim 1 wherein said guides include inner and outer walls, said inner walls being adjustably movable relative to said arm ends and toward and away from said inner walls to vary the space therebetween for accommodating pipe of varying diameters, said inner walls being fixed relative to said arm ends so that said inner walls maintain predetermined radii from said radial adjustment means regardless of the radial adjusted position of said arms and regardless of the adjusted position of said outer walls.",
    "3. A jig to facilitate the bending of plastic pipe to a given curvature comprising straight elongated guides to hold said pipe beyond the ends of such curvature to establish tangential straight segments of the pipe at the extremities of such given curvature, support means interconnecting said guides, said support means including means to vary the angular relationship between said guides, said support means including at least two arms operatively interconnected having said guides connected to the outer extremities thereof, said support means further including a base member to which said arms are connected, said base member being in the form of a protractor, and indicia means thereon to measure the angle between said arms.",
    "4. The jig as set forth in claim 3 including indicia means on said arms to measure the radial position of said arms with respect to said base.",
    "5. A jig to facilitate the bending of plastic pipe to a given curvature comprising straight elongated guides to hold said pipe beyond the ends of such curvature to establish tangential straight segments of the pipe at the extremeties of such given curvature, support means interconnecting said guides, said support means including means to vary the angular relationship between said guides, said support means including at least two arms operatively interconnected having said guides connected to the outer extremities thereof, said support means further including a base member to which said arms are connected, one of said arms being connected to said base member to have only a radial degree of freedom, and the other of said arms being connected to said base member to have both angular and radial degrees of freedom.",
    "6. A jig as set forth in claim 5 wherein said base member comprises folded tabs to receive said one arm, and a plate superimposed upon and pivoted to said base member, said plate having folded tabs to receive said other arm.",
    "7. A jig as set forth in claim 6 including a stud pivotally joining said base and plate having a nut thereon which when drawn down locks said plate, other arm and one arm against movement.",
    "8. A jig as set forth in claim 7 including means beneath said nut properly to distribute the force thereof to subjacent surfaces.",
    "9. A jig to facilitate the bending of plastic pipe to a given curvature comprising straight elongated guides to hold said pipe beyond the ends of such curvature to establish tangential straight segments of the pipe at the extremities of such given curvature, support means interconnecting said guides, said support means including means to vary the angular relationship between said guides, said support means including at least two arms operatively interconnected having said guides connected to the outer extremities thereof, said arms having a slot along the major axis thereof, an arcuate base member having at least one arcuate slot therein, said arms being joined to said base member by connection means disposed within said arm and base member slots at their points of intersection.",
    "10. A jig as set forth in claim 9 including a radially and angularly adjustable third arm connected to said base member, said third arm having a pipe bend guide on the outer end therof."
  ],
  "cpc": [
    "B29C 53/083",
    "B29L 2023/22"
  ],
  "assignees": [
    "MILLER L",
    "CURTIS J"
  ],
  "filing_date": "1971-05-19",
  "publication_date": "1973-12-04",
  "grant_date": "1973-12-04",
  "priority_date": "1971-05-19",
  "application_number": "US-3776539D-A",
  "family_id": "22510274",
  "citations": [
    "US1323127A",
    "US2311042A",
    "US2679178A",
    "US2803872A",
    "US2936803A",
    "US2941557A",
    "US3065550A",
    "US3394389A",
    "US783031A"
  ]
}