US3763685A - Tube bending tool - Google Patents

Tube bending tool Download PDF

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Publication number
US3763685A
US3763685A US00165824A US3763685DA US3763685A US 3763685 A US3763685 A US 3763685A US 00165824 A US00165824 A US 00165824A US 3763685D A US3763685D A US 3763685DA US 3763685 A US3763685 A US 3763685A
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United States
Prior art keywords
bending
tube
steering element
tool
bending guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00165824A
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English (en)
Inventor
B Fjellstrom
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Individual
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Individual
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Filing date
Publication date
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Publication of US3763685A publication Critical patent/US3763685A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/022—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment over a stationary forming member only

Definitions

  • a tool for bending hollow tubes includes a rotatably mounted bearing element having an abutment element for rigidly grasping the tube.
  • a steering element having a circular periphery is attached to the bearing element.
  • the periphery of the steering element has a non-circular groove.
  • a bending guide having a noncircular groove is positioned over the tube to face the steering element. The two grooves form therebetween a non-circular channel.
  • a handle and a linkage system are connected to the steering element and bending guide to selectively cause the bending guide to be rotated around the periphery of the steering element and to maintain the tube within the channel during the bending.
  • the present invention relates to a tube bending tool and more particularly to a tool for bending of tubes having a circular or a substantially circular crosssection. Furthermore, the present invention relates to a tube bending tool for bending tubes in complicated configurations involving predetermined lengths of tubes and bending angles.
  • the object of the present invention is to provide a tube bending tool, in which the above-mentioned disadvantages are eliminated and wherein the use of a mandrel or other means in the inside of the tube during the bending of the tube is not required.
  • FIG. 1 is a side elevational-vie of a tube bending tool according to the present invention.
  • FIG. 2 is a cross-sectional view taken along line 1-] of FIG. 1.
  • a hearing box or bearing member 13 is pivotably mounted to a frame element (not shown).
  • the bearing box or bearing member 13 is selectively pivotably arranged around the axis of the entire tool, which coincides with the axis of the tube intended to be bent.
  • a semi-circular steering element 3 is fitted to the bearing element 13 by means of a screw 12.
  • Steering element 3 is provided with a groove 18.
  • An abutment member 1' is provided to abut the 'tube' 15 by means of a locking screw 11.
  • a bending guide 2 arranged for abutting the tube or to be brought into contact with the tube. Bending guide 2 also is provided with a groove 17.
  • a linkage system consisting of levers 4, 7, 6 and 8 and a handle lever 5 is provided for imparting the necessary force required for bending the tube.
  • the lever 6 is attached via joints 4 and 6 to levers 4 and 7, respec tively,'while the lever 8 in a corresponding way is attached via. joints 8 and 8" to the levers 4 and 7, respectively.
  • Rolls and 9 are pivotally attached via joints 10' and 9' to the levers 7 and 4, respectively.
  • the rolls Y10 and 9 are provided for transferring the necessary through the centerlines of the joints 10' and the pins 14 will always provide a cross-section as shown in FIG. 2. Accordingly, during bending the roll [0 always will exert a pressure perpendicular to the bending guide 2 and the tube 15 in a direction towards the centerline of the pins 14 in the steering element.
  • the grooves 17 and 18 are so arranged that they together counteract any tendency of the tube to flatten when bending thetube without using a mandrel.
  • the breadth a of the co-operating grooves 17 and 18 and the resultant channel between the bending guide 2 and the steering element 3 must accordingly always be less than the depth b (FIG. 2).
  • the crosssection of the channel formed by grooves 17 and 18 the radius of curvature of the channel varies continuously in every sector constituting a quarter (half of a groove) thereof.
  • the grooves in the bending guide 2 and the steering element 3 need not have identical configurations. Accordingly, the groove 17 may have the form of a deeper half ellipse or hyperbola, while the groove 18 could have the same form but less depth.
  • the tube 15 When conducting a bending operation, the tube 15 will be fixed to the bearing box or bearing member 13 by me ns of the abutment member 1 and the locking screw 11. The bearing member will be rotated to align the bend in the desired plane of the tube, and then it is fixed by means of, for example, locking screws. The linkage system with the bending guide 2 is then attached to the tube bending tool, after which the hand lever 5 is moved downwardly until the desired bending angle is obtained.
  • Tubes bent by means of the tube bending tool according to the invention do not exhibit flattened portions. Likewise, they have an even wall thickness-Furthermore, the tension in the tube is constant from one portion of the bend to another, because there do not exist friction forces in these portions, which forces appear in bending of tubes with a conventional bending tool.
  • a tool for bending hollow tubes having a substantially circular cross-section comprising:
  • a bearing element rotatably mounted and adapted to support a tube to be bent, said bearing element having an abutment element for rigidly grasping said tube;
  • a steering element attachable to said bearing element, at least a portion of the periphery of said steering element having the form of a circular are, said periphery having therein a groove, the crosssectional arc of which is non-circular, positioned to contact said tube during the bending thereof;
  • said bending guide positionable in overlying relationship on said tube to face said steering element
  • a force applying means engageable with said steering element and said bending guide for selectively forcing said bending guide to rotate around the periphery of said steering element, thereby bending said tube while maintaining said tube within said channel.
  • said force applying means comprises:
  • a linkage system connected to said handle and including a first lever attachable to the radial center of said steering element, first roller means on said first lever and engageable with said bending guide, a second lever interconnected to said first lever, and second roller means on said second lever and engageable with said bending guide.
  • a tool as claimed in claim 1, wherein said crosssectional arc of said groove in said steering element is an ellipse 6.
  • a tool as claimed in claim 1, wherein said crosssectional arc of said groove in said steering element is a hyperbola.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00165824A 1970-04-29 1971-11-02 Tube bending tool Expired - Lifetime US3763685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE05942/70A SE355306B (ja) 1970-04-29 1970-04-29

Publications (1)

Publication Number Publication Date
US3763685A true US3763685A (en) 1973-10-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00165824A Expired - Lifetime US3763685A (en) 1970-04-29 1971-11-02 Tube bending tool

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US (1) US3763685A (ja)
SE (1) SE355306B (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055065A (en) * 1976-11-22 1977-10-25 Hossfeld Manufacturing Co. Method and apparatus for simultaneous edge bending of stair rail cap stock and channel stock
US5626045A (en) * 1994-04-25 1997-05-06 Bulle; Marshall R. Metal stock bender
US8234898B1 (en) 2008-12-12 2012-08-07 Wilson Brian S Bending assembly for extruded stock material
US11571943B2 (en) * 2017-03-30 2023-02-07 Nhk Spring Co., Ltd. Hollow stabilizer, stabilizer manufacturing device, and method for manufacturing hollow stabilizer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111604396A (zh) * 2020-06-03 2020-09-01 浙江虹腾新材料有限公司 一种五金材料加工用折弯装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US361398A (en) * 1887-04-19 Device for bending pipe
US1239165A (en) * 1916-06-09 1917-09-04 Ray L Davis Pipe-bending apparatus.
US2656872A (en) * 1950-03-23 1953-10-27 Hossfeld Mfg Company Iron bending machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US361398A (en) * 1887-04-19 Device for bending pipe
US1239165A (en) * 1916-06-09 1917-09-04 Ray L Davis Pipe-bending apparatus.
US2656872A (en) * 1950-03-23 1953-10-27 Hossfeld Mfg Company Iron bending machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055065A (en) * 1976-11-22 1977-10-25 Hossfeld Manufacturing Co. Method and apparatus for simultaneous edge bending of stair rail cap stock and channel stock
US5626045A (en) * 1994-04-25 1997-05-06 Bulle; Marshall R. Metal stock bender
US8234898B1 (en) 2008-12-12 2012-08-07 Wilson Brian S Bending assembly for extruded stock material
US11571943B2 (en) * 2017-03-30 2023-02-07 Nhk Spring Co., Ltd. Hollow stabilizer, stabilizer manufacturing device, and method for manufacturing hollow stabilizer

Also Published As

Publication number Publication date
SE355306B (ja) 1973-04-16

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