US3641803A - Methods for the manufacture of a contact strip folded in zigzag for a fixed switching contact and folding machines for performing said methods - Google Patents

Methods for the manufacture of a contact strip folded in zigzag for a fixed switching contact and folding machines for performing said methods Download PDF

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Publication number
US3641803A
US3641803A US867797A US3641803DA US3641803A US 3641803 A US3641803 A US 3641803A US 867797 A US867797 A US 867797A US 3641803D A US3641803D A US 3641803DA US 3641803 A US3641803 A US 3641803A
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United States
Prior art keywords
teeth
strip
bending
tooth
sets
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Expired - Lifetime
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US867797A
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English (en)
Inventor
Petrus J Schuurbiers
Louis A Verhagen
Johannes G L Vernhout
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COQ NV
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COQ NV
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • 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
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts

Definitions

  • ABSTRACT Filedi L 20, 1969 A method and a machine for the manufacture of a zigzag folded metal contact strip for a fixed contact which per- [21] Appl' 867;, manently snugly encloses an axially movable switching rod of an electric switch, said strip being alternately bent in said [30] Foreign Application Priority Data machine in one and in the other direction out of its plane over the foremost teeth of two cooperating sets of intermittently Apr. 24, 1969 Netherlands ..6906378 movable math:
  • the invention relates to a method and a bending machine for the manufacture of a zigzag folded metal contact strip for a fixed contact which permanently snugly encloses an axially movable switching rod of an electric switch of large power and electrically conductively connects said switching rod with the end of the electric circuit to be closed and opened by said switch.
  • the invention has the object to provide a method and a machine for folding a metal strip in zigzag, in which said material stresses occur in predeterminable places of the strip and are equal in all corresponding places, so that the contact strip will clasp the switching rod tightly with an evenly distributed force.
  • This is attained in that in the bending machine the strip of metal, from which the contact strip is formed, is alternately bent in one and in the other direction out of its flat surface over a movable tooth which, during the bending operation, is kept in place.
  • the deformation occurs only in the folds of the zigzag-shaped strip. Since furthermore the parts of the zigzag-shaped strip enclose, at the folds, the same angles, the material stresses due to its folding are equal, so that the parts of the contact strip come to lie against the switching rod with the same contact pressure.
  • the bending machine for carrying out the described method can advantageously be provided with a holder, two sets of at least two equal movable teeth positioned side by side, said sets of teeth facing each other in said holder, the active end portion of each tooth having two inclined flanks adjoining each other in an end edge, the teeth of one set extending with their active end portions between and next to the active end portions of the teeth of the other set with sufiicient clearance for the strip which has to be passed between said sets, means for the periodic removal of the two teeth, which are found on the strip discharge side of the sets of teeth, from said sets, means for shifting the sets of teeth together from the strip-receiving side to the strip discharge side of said sets for a distance which is equal to the thickness of one tooth, means for returning the teeth removed from said sets one after the other to the stripreceiving side of the sets of teeth and a device found in the holder in front of the strip-receiving side of the sets of teeth and adapted to be moved transversely to the shifting direction of said sets for guiding
  • the bending machine may be constructed in such a manner, that the teeth of one set are each provided near the root of their flanks facing the strip discharge side of the sets of teeth with a transverse groove formed in said flanks and a movable pressing tool is provided behind the strip discharge side of said set, by means of which the bent part of the strip lying against said flank of the tooth found on the strip discharge side of said sets can be forced with its fold into said groove.
  • the thus formed substantially tubular contact places are preferably a bit curved in the axial direction of the tube to facilitate the movement of the switching rod through the fixed contact provided with the zigzagshaped contact strip.
  • the transverse groove and the adjacent area of said tooth flank may have each in their transverse direction a concave shape and the pressing surface of the pressing tool may have a corresponding convex shape in its transverse direction.
  • the bending machine may be provided behind the strip discharge side of the sets of teeth with a movable pushing member, by means of which at least the parts of the strip which adjoin each other in the folds found on one side of the zigzag folded strip discharged form the sets of teeth can be forced towards one another.
  • FIG. 1 partly an axial sectional view, partly an elevational view of a portion of a switching rod and a fixed contact, which is in permanent contact with said rod, of a switch of large power constructed in accordance with the invention
  • FIG. 2 a cross-sectional view taken on the line IIII in FIG.
  • FIG. 3 a perspective view of a portion of a contact strip for the meant fixed contact of such a switch
  • FIG. 4 partly a vertical sectional view, partly anelevational in view of a machine for the manufacture of a zigzag-shaped contact strip
  • FIG. 5 a horizontal cross-sectional view taken on the broken line V-V in FIG. 4,
  • FIG. 6 a vertical cross-sectional view taken on the line VI- VI in FIG. 4 and FIG. 7 on a larger scale and in perspective some details of the machine shown in FIGS. 4, 5, 6.
  • an axially movable switching rod of an electric switch of large power is designated by 1.
  • a fixed contact which consists of an annular metal holder 2 and a contact strip 3 supported by said holder.
  • the contact strip 3 consists of a zigzag folded metal strip which is bent in the shape of a ring clasping tightly around the switching rod 1.
  • the parts 3', 3 of the folded strip 3 extend in pairs closely together and substantially parallel to each other and they are directed almost tangentially to the switching rod 1. It appears from FIGS. 2 and 3, that the contact strip 3 lies against the switching rod with portions in the shape of a curved split tube 4 which is forced aside.
  • the curvature of the tubular portion 4 is not necessary but it facilitates the movement of the switching rod 1 through the annularly bent contact strip 3.
  • the machine shown in FIGS. 4-7 for the manufacture of the zigzag folded contact strip 3 is provided with a holder 5 formed as a housing which consists in a manner not indicated of detachably interconnected parts, so that all members and parts can be mounted therein.
  • the machine is provided with a set of movable vertical teeth 6 which are positioned side by side and a set of movable vertical teeth 6" positioned one next to the other.
  • Each tooth 6', 6" is provided with an active end portion 7, 7" having inclined flanks 9, 9" adjoining each other in an end edge 8', 8" and with two horizontally projecting portions l0, 10" by means of which the tooth is adapted to engage guiding grooves 11', 12', 11", 12 of the holder 5.
  • the end portions 7 of the teeth 6' extend between and next to the end portions 7" of the teeth 6" with sufficient clearance to receive the metal contact strip 13 to be passed through the sets of teeth 6', 6", when the teeth 6', 6" engage with their projecting portions 10, 10 the guiding grooves 11', 11''.
  • the teeth 6', 6" can be moved from the left (the strip-receiving side) to the right (the strip discharge side) by means of horizontally movable forks 14, 14'' for a distance which is equal to the thickness of one tooth.
  • the teeth 6', 6 lying on the strip discharge side are found in vertically movable slides 15', 15'', by means of which these teeth can be vertically removed from the interrneshing sets of teeth 6, 6" and can be positioned with their projecting portions 10', 10" in front of guiding grooves 12, 12".
  • the teeth 6', 6" can be pushed out of the slides 15', 15" and through the guiding grooves 12', 12" into similar vertically movable slides 17', 17" by means of horizontally movable pushing members 16, 16''.
  • the slides l7, 17 are adapted to return the teeth 6, 6 to the stripreceiving side of the intermeshing sets of teeth 6', 6" into said sets.
  • a vertically up and down movable block 18 provided with guiding rollers 19 is mounted in the holder 5.
  • the strip 13 to be folded in zigzag is passed through said rollers.
  • the machine starts in a condition, in which the forks l4, 14 are found in the lefthand end position and the left most teeth 6 and 6" are kept in the shown inactive position in the slides 17', 17" outside the intermeshing sets of teeth 6, 6", whereas the block 18 is in its uppermost position.
  • the free end of the metal strip 13, which has to be bent, is then placed on the flank 9' of the leftmost tooth 6 of the active set of teeth 6.
  • the slide 17" carrying the tooth 6" is moved upwards, so that the strip 13 is kept in place between the teeth 6' and 6" in question.
  • the block 18 is moved downwards, so that the strip is bent over the end edge 8" of the tooth 6".
  • the slide 17' containing the tooth 6 is moved downwards and thereupon the block 18 is returned to its uppermost position, so that the strip 13 is bent over the end edge 8' of the tooth 6'.
  • the strip 13 then has two parts of the required zigzag shape.
  • the slides 15', 15" containing teeth 6', 6" are vertically removed from the sets of teeth 6', 6".
  • the pushing members 16, 16" are first moved a bit to the left and immediately thereafter again to the right, in such a manner, that the teeth 6', 6" are pushed out of the slides 15', 15" and come to hang temporarily in the guiding grooves 12, I2".
  • the teeth 6' are each provided with a transverse groove 20 in their flank 9' facing the discharge side of the sets of teeth 6', 6". Furthermore a vertically movable block 21 comprising a pressing tool 22 constructed as a pivotable pawl is provided.
  • This pressing tool is forced upwards by means of a fixed stop pin 23, when the block 21 is moved downwards, so that the pressing surface 24 of said tool is forced towards to transverse groove 20 of the tooth 6 contained in the slide 15.
  • at least the fork 14' is moved to the right as far as possible, as is shown in FIG. 4, so that the upper fold of the zigzag folded strip 13 lying against the free flank 9' of said tooth 6' is forced by the pressing pawl 22 into the groove 20.
  • the machine is provided with a horizontally movable block 25 having a pawl-shaped pushing member 26.
  • This pushing pawl 26 is pressed against the tubular fold 4' (FIG. 4) of the strip 13, which has just come out of reach of the sets of teeth 6', 6" and the pressing pawl 22, 24.
  • the tubular folds 4 of the strip 13 are forced by the pushing pawl 26 towards each other as closely as possible.
  • the completed zigzag bent strip 13 is discharged from the machine through a tube 27. Pieces of predetermined length are then cut off from this strip and thereafter the contact strips are manufactured by bending said pieces.
  • the forks 14, 14', the slides 15', 15'', the pushing members 16', 16', the slides 17, 17", the block 18, the block 21 and the block 25 are respectively coupled by rods 28', 28", 29', 29", 30', 30", 31', 31", 32, 33 34 with mechanical, hydraulical or pneumatical driving means, which are not shown.
  • a holder assembly having a strip-bending region and a folded strip delivery region disposed in spaced relation to each other and defining a strip-translating space therebetween;
  • guide means for guiding said first and said second sets of teeth in tip-meshed condition from said bending region to said delivery region along said strip-translating space and including first means defining a recirculation path for said first set of teeth from said delivery region back to said bending region, and second means defining a recirculation path for said second set of teeth from said delivery region back to said bending region;
  • tooth-moving means for withdrawing one tooth of each set from tip-meshing condition at said delivery region to commence recirculation thereof and for translating the remaining tip-meshed teeth of the two sets toward said delivery region;
  • the bending machine according to claim 1 including pusher means for closing those folds formed by the tips of the teeth of said second set.
  • said tooth-moving means comprises first and second withdrawing members associated with the first and second sets of teeth respectively, and first and second yoke members associated with said first and second sets of teeth.
  • said tooth-moving means also includes first and second pushing members associated with said first and second sets of teeth.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Manufacture Of Switches (AREA)
US867797A 1969-04-24 1969-10-20 Methods for the manufacture of a contact strip folded in zigzag for a fixed switching contact and folding machines for performing said methods Expired - Lifetime US3641803A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL696906378A NL139671B (nl) 1969-04-24 1969-04-24 Werkwijze en buigmachine voor het vervaardigen van een als ringvormig vast schakelaarcontact dienende zigzagvormig gevouwen platte contactstrook en vast schakelaarcontact, vervaardigd met die werkwijze.
AU63079/69A AU425816B2 (en) 1969-04-24 1969-10-30 Zigzag folded metal contact strips for fixed switch contacts

Publications (1)

Publication Number Publication Date
US3641803A true US3641803A (en) 1972-02-15

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US867797A Expired - Lifetime US3641803A (en) 1969-04-24 1969-10-20 Methods for the manufacture of a contact strip folded in zigzag for a fixed switching contact and folding machines for performing said methods

Country Status (9)

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US (1) US3641803A (enrdf_load_stackoverflow)
AT (1) AT294539B (enrdf_load_stackoverflow)
AU (1) AU425816B2 (enrdf_load_stackoverflow)
BE (1) BE749191A (enrdf_load_stackoverflow)
CA (1) CA925416A (enrdf_load_stackoverflow)
DE (1) DE1950382A1 (enrdf_load_stackoverflow)
FR (1) FR2041972A5 (enrdf_load_stackoverflow)
GB (1) GB1230038A (enrdf_load_stackoverflow)
NL (1) NL139671B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851518A (en) * 1972-01-04 1974-12-03 Skomab Int Maschinen U Stahl H Bending apparatus for bending strip steel knives
US3885413A (en) * 1972-05-19 1975-05-27 Bremsen & Filter Handelsges Method and machine for fashioning sheet materials
US3892119A (en) * 1974-03-04 1975-07-01 Caterpillar Tractor Co Forming apparatus for sheet material
US4409813A (en) * 1981-10-27 1983-10-18 Day Jack R Method and apparatus for corrugating strips
WO1987004374A1 (en) * 1984-07-18 1987-07-30 Erik Rantala An edging machine
US4736518A (en) * 1986-05-13 1988-04-12 Donaldson Company, Inc. Method and apparatus for construction of crimp seal pleated filter assembly
US4793051A (en) * 1986-05-13 1988-12-27 Donaldson Company, Inc. Method for construction of crimp seal pleated filter assembly
US5694803A (en) * 1994-11-30 1997-12-09 Solar Turbines Incorporated Fin folding machine for corrugating sheet material
US20100170315A1 (en) * 2007-06-01 2010-07-08 The University Of Queensland Assembly and Method for Press Forming a Deformable Material
US20110229689A1 (en) * 2008-12-04 2011-09-22 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method And Device For Manufacturing A Structured Lining Wave, And Such A Lining Wave
CN109940088A (zh) * 2019-03-11 2019-06-28 宁波楚鑫材料科技有限公司 一种伺服送料纵向移模多工位触点制造设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60142511A (ja) * 1983-12-29 1985-07-27 株式会社村田製作所 蛇行状リ−ド線の成形方法およびその装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2047717A (en) * 1934-01-02 1936-07-14 Van Dresser Specialty Corp Forming machine
US2329789A (en) * 1939-11-16 1943-09-21 Mccord Radiator & Mfg Co Apparatus for making heatexchange elements
US2397582A (en) * 1944-03-09 1946-04-02 Curtiss Wright Corp Corrugating die
US3199175A (en) * 1962-07-06 1965-08-10 Vereinigke Osterreichische Eis Method and apparatus for the continuous manufacture of zigazag-shaped strutting for lattice structures and of lightwght structures comprising such struting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2047717A (en) * 1934-01-02 1936-07-14 Van Dresser Specialty Corp Forming machine
US2329789A (en) * 1939-11-16 1943-09-21 Mccord Radiator & Mfg Co Apparatus for making heatexchange elements
US2397582A (en) * 1944-03-09 1946-04-02 Curtiss Wright Corp Corrugating die
US3199175A (en) * 1962-07-06 1965-08-10 Vereinigke Osterreichische Eis Method and apparatus for the continuous manufacture of zigazag-shaped strutting for lattice structures and of lightwght structures comprising such struting

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851518A (en) * 1972-01-04 1974-12-03 Skomab Int Maschinen U Stahl H Bending apparatus for bending strip steel knives
US3885413A (en) * 1972-05-19 1975-05-27 Bremsen & Filter Handelsges Method and machine for fashioning sheet materials
US3892119A (en) * 1974-03-04 1975-07-01 Caterpillar Tractor Co Forming apparatus for sheet material
US4409813A (en) * 1981-10-27 1983-10-18 Day Jack R Method and apparatus for corrugating strips
WO1987004374A1 (en) * 1984-07-18 1987-07-30 Erik Rantala An edging machine
US4793051A (en) * 1986-05-13 1988-12-27 Donaldson Company, Inc. Method for construction of crimp seal pleated filter assembly
US4736518A (en) * 1986-05-13 1988-04-12 Donaldson Company, Inc. Method and apparatus for construction of crimp seal pleated filter assembly
US5694803A (en) * 1994-11-30 1997-12-09 Solar Turbines Incorporated Fin folding machine for corrugating sheet material
US20100170315A1 (en) * 2007-06-01 2010-07-08 The University Of Queensland Assembly and Method for Press Forming a Deformable Material
US9352373B2 (en) * 2007-06-01 2016-05-31 The University Of Queensland Assembly and method for press forming a deformable material
US9914162B2 (en) 2007-06-01 2018-03-13 The University Of Queensland Assembly and method for press forming a deformable material
US20110229689A1 (en) * 2008-12-04 2011-09-22 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method And Device For Manufacturing A Structured Lining Wave, And Such A Lining Wave
CN109940088A (zh) * 2019-03-11 2019-06-28 宁波楚鑫材料科技有限公司 一种伺服送料纵向移模多工位触点制造设备
CN109940088B (zh) * 2019-03-11 2023-09-22 宁波楚鑫材料科技有限公司 一种伺服送料纵向移模多工位触点制造设备

Also Published As

Publication number Publication date
FR2041972A5 (enrdf_load_stackoverflow) 1971-02-05
AT294539B (de) 1971-11-25
NL6906378A (enrdf_load_stackoverflow) 1970-10-27
GB1230038A (enrdf_load_stackoverflow) 1971-04-28
AU425816B2 (en) 1972-07-04
CA925416A (en) 1973-05-01
NL139671B (nl) 1973-09-17
BE749191A (nl) 1970-10-01
DE1950382A1 (de) 1971-05-06
AU6307969A (en) 1971-07-22

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