US3625262A - Conductor wrapping bit and method for forming a surface thereon - Google Patents

Conductor wrapping bit and method for forming a surface thereon Download PDF

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Publication number
US3625262A
US3625262A US828822A US3625262DA US3625262A US 3625262 A US3625262 A US 3625262A US 828822 A US828822 A US 828822A US 3625262D A US3625262D A US 3625262DA US 3625262 A US3625262 A US 3625262A
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United States
Prior art keywords
wire
bit
terminal
camming
face
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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US828822A
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English (en)
Inventor
William J Baker
Richard J Hurst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gardner Denver Inc
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Gardner Denver Inc
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Filing date
Publication date
Application filed by Gardner Denver Inc filed Critical Gardner Denver Inc
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Publication of US3625262A publication Critical patent/US3625262A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/033—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for wrapping or unwrapping wire connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/532—Conductor
    • Y10T29/53209—Terminal or connector
    • Y10T29/53213—Assembled to wire-type conductor
    • Y10T29/53235—Means to fasten by deformation

Definitions

  • a rotary bit for wrapping conductor wire about a terminal in helical convolutions to form an electrical connection The bit includes a longitudinal terminal-receiving bore and a conductor wire-receiving groove in radially offset parallelism therewith.
  • a wire-camming surface slopes radially inwardly from the transverse end face of the bit to the terminal bore and includes a helical rise for continuously camming and supporting a major portion of successive wire convolutions.
  • a wire guide surface intersects the conductor groove and sloped camming surface for feeding the wire into camming position.
  • the sloped camming surface is formed by a rotary form machining tool which is simultaneously rotated relative to the bit longitudinal axis and axially moved relative to the bit end face.
  • Conductonwrapping tools commonly incorporate a bit which is connected with a rotary motor and joumaled in a surrounding stationary sleeve.
  • the bit is usually provided with a longitudinal bore for receiving an electrical terminal and a radially offset groove for receiving a stripped end portion of a wire which is to be wound in helical convolutions about the terminal upon rotation of the bit.
  • Known conductor-wrapping bits include types having surfaces opening to the end face of the bit which operate to cam portions of the conductor wire radially inwardly onto the terminal as the winding process is carried out. This camming action enhances the electrical and mechanical integrity of the connection in various ways.
  • Conductor-wrapping bits known in the art which have sloped camming surfaces are disclosed in U.S. Pat. No. 2,758,797 to E. P. Miklau and U.S. Pat. No. 3,078,052 to W. L. Olds et al.
  • the conductor-wrapping bit of Miklau provides a helical sloped surface for camming the end portion of the wire
  • the wrapping bit of Olds provides a sloped surface for radial and axial camming of portions of each wire convolution as well as the end portion.
  • a conductor-wrapping bit which operates to wrap a conductor wire in successive helical convolutions about a terminal with consistency of mechanical and electrical characteristics regardless of dimensional variations which are normally encountered in mass produced terminals and wire.
  • the present invention further provides a wrapping bit having a wire camming and support surface which operates to cam a major portion of a wire convolution radially inwardly with respect to the bit axis of rotation and axially forwardly away from the bit end face to assure a properly wrapped connection.
  • the functional advantages of the present invention are realized in the wrapping operation by a wrapping bit having a camming surface which substantially surrounds the terminal receiving bore and slopes radially inwardly from the transverse end face of the bit to the terminal-receiving bore whereby the wire is cammed onto the terminal over a major portion of each convolution regardless of dimensional variations in terminal and wire cross section.
  • the bit camming surface is provided with a helical rise conforming substantially to the natural helix of a wire convolution to provide for reduced contact stress between the bit surface and the wire and to provide uniform camming action.
  • the present invention further includes a wire guide surface intersecting the conductor receiving groove and the sloped camming surface which is operable to feed the wire into the most desirable camming position between the terminal edge and the bit camming surface.
  • the present invention also provides a novel method for forming a helical sloped surface on a conductor-wrapping bit by simultaneously providing relative axial movement between the bit and a form machining tool and rotating the tool relative to the bit about the longitudinal axis of the latter.
  • FIG. 2 is a transverse end view of the conductor-wrapping bit of the present invention.
  • FIG. 5 is a partial longitudinal section view of the wrapping bit illustrating how the wire-camming surface compensates for variations in terminal dimensions.
  • FIG. 6 is a transverse end view of the wrapping bit in the process of wrapping a conductor wire about a square terminal.
  • FIG. 7 is a section view taken along the line 7-7 of FIG. 6.
  • the tubular sleeve 24 is operable to axially retain and rotatably journal a conductor wrapping bit 26 preferably made of heat treatable steel and having a bit end face 28 opening to the distal end of the sleeve 24.
  • the bit 26 includes an integral shank 30 having a portion nonrotatably engaged with a rotatable spindle 32 by means of a transverse pin 34.
  • the spindle 32 is suitably rotatably driven by the tool motor whereby the bit 26 is rotated within the stationary supporting sleeve 24.
  • the conductor wire wrapping bit 26 is operable to tightly wrap the stripped end of a flexible electrical conductor wire about a metallic post or terminal in a series of helical convolutions to form a solderless electrical connection.
  • the particular geometry of the bit end face and surfaces in proximity thereto which comprise an improvement in the art of wire-wrapping bits is set forth herein.
  • a conductor wire receiving groove 44 comprising a rectangular slot 46 longitudinally formed near the circumference of the bit and closed by the inner wall 48 of the stationary support sleeve 24 (FIG. 6).
  • An enlarged circular counterbore portion 50 of the wire-receiving groove 44 (see FIG. 7) is provided for receiving a portion of conductor wire insulation if it is desired to form a wrapped connection having an insulated portion.
  • the bit 26 is further provided with wireguiding surface means 52 intersecting the wirecamming surface 40 and the wire-receiving groove 44.
  • the guiding surface 52 slopes axially with respect to the longitudinal bit axis 42 (FIG. 3) from the intersection with the camming surface 40 to the groove 44.
  • the intersection of the surface 52 with the groove 44 is formed by a radius R over which a conductor wire is bent as it moves from the groove 44 along the surface 52 and into the camming position at 54 on the camming surface 40.
  • the guide surface 52 is generally funnelshaped converging from the intersection with the groove 44 to the intersection with the camming surface 40.
  • the longitudinal axis of the funnel-shaped surface 52 corresponds to the line 33 and lies in a plane parallel to the longitudinal axis 42 of the bit.
  • a preferred method of forming the guide surface 52 is by means of a rotary form milling cutter.
  • Surrounding the conductor wire receiving groove 44 is a somewhat U-shaped recess 58 which is formed to facilitate a coining operation which forms the radius R.
  • the operation of a conductor wire wrapping bit is for the purpose of forming a series of contiguous convolutions of wire wrapped tightly on a terminal. Superior wrapped connections are performed by bits which cam the wire onto the terminal rather than merely pulling the wire around the terminal.
  • FIGS. 6 and 7. the views show the terminal 38 wrapped with approximately two turns or convolutions of conductor wire C.
  • the stripped end portion 60 of the conductor wire is inserted in the groove 44 and the wire is laid in the notch 62 in the stationary sleeve 24, see FIG. 6.
  • the insulated portion 64 of the wire C extends just inside the notch as shown.
  • the tool is then positioned over the terminal 38 with the terminal extending into the bore 36 as shown in FIG. 7.
  • the tool With wire C held stationary relative to the sleeve 24 at the notch 62, the tool is operated to rotate the bit 26 in the direction of the arrow in FIG. 6.
  • the conductor wire is pulled out of the groove 44 and guided by the funnel-shaped guide surface 52 to a position between the camming surface 40 and the corner 66 of the terminal 38, see FIG. 6, whereby the wire is cammed by the surface 40 into contact with the terminal.
  • FIG. 6 there is actually penetration of the terminal corner 66 into the wire C to assure adequate electrical contact area and a gastight connection.
  • Continued rotation of the bit 26 causes successive portions of the camming surface 40 to come into camming and supporting contact with the wire C to wrap a series of helical convolutions.
  • a distinct advantage of the bit 26 is the provision ofthe helically sloped camming and support surface 40 which compressively embraces a major portion of a wire convolution whereby the wire is continuously and substantially evenly pressed radially inward against the terminal 38 and axially against the previous convolution to provide a connection of superior mechanical and electrical character.
  • the camming surface 40 provides continuous and even force against the wire as indicated by the force vectors 70 shown with their axial and radial components.
  • FIG. 5 A principal advantage of the bit 26 over known conductor wire wrapping bits is illustrated in FIG. 5.
  • the sloping cam surface 40 is operable to compensate for terminal diagonal dimensional variations which affect the radial location of the terminal corners 66. Ifan undersize or lower dimensional limit terminal is encountered, the conductor wire C is guided by the funnel-shaped surface 52 onto the camming surface deeper in the recess formed by the surface 40 or further away from the transverse end face 28 whereby it is properly cammed onto the edge 66. If a terminal 39, designated by the dashed line, having the larger or maximum diagonal dimension is encountered the conductor, represented by the dashed circle, comes into camming position on the surface 40 closer to the transverse end face 28.
  • bit-camming surface 40 slopes radially inwardly from intersection with the transverse end face 28 to intersection with the longitudinal terminal-receiving bore 36 and the surface 40 also has a helical rise with respect to the longitudinal bit axis 42.
  • a preferred method of forming the surface 40 is by means of a rotary form machining tool 76.
  • the tool 76 may be a milling cutter or a grinding tool or any suitable tool on which a form surface 78 may be provided.
  • the tool 76 is rotatable about an axis 80 and is rotatably driven by the shank portion 82 which is operative to be driven by a drive spindle, not shown.
  • the bit may be orbited around the axis 80 of the tool and moved axially with respect to the tool-machining surface 78 to form the surface 40 the result in either process being to effect relative motion between the bit and the tool which will generate the sloped helical surface.
  • a bit for wrapping a wire about a terminal in helical convolutions comprising:
  • surface means intersecting said wire-receiving groove and said wire-camming surface and sloping axially with respect to the longitudinal axis of said bit from said intersection with said wire-camming surface to said intersection with said wire receiving groove, said surface means including a substantially funnel-shaped section converging from said intersection with said wire-receiving groove to said intersection with said wire-comming surface; for guiding said wire into a position for camming said wire onto said terminal by said wire-camming surface.
  • the longitudinal axis of said funnel-shaped section lies in a plane parallel to the longitudinal axis of said bit.
  • a bit for wrapping a wire about a terminal in helical convolutions comprising:
  • wire guide surface means intersecting said wire-receiving groove and sloping axially toward said bit end face for guiding said wire into a position for camming said wire onto said terminal by said wire-camming surface means.
  • said wire guide surface means comprising a substantially funnel-shaped portion converging from said intersection with said wire-receiving groove toward said bit end face.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Processing Of Terminals (AREA)
  • Wire Processing (AREA)
  • Manufacture Of Motors, Generators (AREA)
US828822A 1969-05-29 1969-05-29 Conductor wrapping bit and method for forming a surface thereon Expired - Lifetime US3625262A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82882269A 1969-05-29 1969-05-29

Publications (1)

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US3625262A true US3625262A (en) 1971-12-07

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US828822A Expired - Lifetime US3625262A (en) 1969-05-29 1969-05-29 Conductor wrapping bit and method for forming a surface thereon

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US (1) US3625262A (enExample)
DE (1) DE2019983C3 (enExample)
GB (1) GB1250255A (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781932A (en) * 1971-12-16 1974-01-01 Gardner Denver Co Cutting, stripping, and wrapping bit for insulated conductor wire
US3788367A (en) * 1971-11-03 1974-01-29 Universal Instruments Corp Wire wrap tool
US3882906A (en) * 1972-06-30 1975-05-13 Siemens Ag Wire winding machine
US3903935A (en) * 1972-08-15 1975-09-09 Post Office Wire wrapping apparatus
US3967661A (en) * 1975-09-17 1976-07-06 Vector Electronic Company Insulation slitting and wire wrapping tool
US4051875A (en) * 1977-01-31 1977-10-04 Gardner-Denver Company Conductor wrapping bit
US5036578A (en) * 1990-06-11 1991-08-06 Ok Industries Inc. Cutting, stripping and wire-wrapping hand tool
US20170174089A1 (en) * 2015-12-21 2017-06-22 Delphi Technologies, Inc. Conductor Winding Tool And Battery Charger Having The Same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758797A (en) * 1952-05-09 1956-08-14 Western Electric Co Tool for winding wire on terminals
CA578611A (en) * 1959-06-30 Gardner-Denver Company Wire winding tool
US3078052A (en) * 1960-06-30 1963-02-19 Gardner Denver Co Conductor wrapping device
US3095913A (en) * 1959-05-29 1963-07-02 Gen Electric Co Ltd Devices for wrapping and removing wrapped connections
US3143307A (en) * 1962-10-31 1964-08-04 Gardner Denver Co Conductor wrapping bit
US3244202A (en) * 1963-12-05 1966-04-05 Ibm Wire wrapping devices

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA578611A (en) * 1959-06-30 Gardner-Denver Company Wire winding tool
US2758797A (en) * 1952-05-09 1956-08-14 Western Electric Co Tool for winding wire on terminals
US3095913A (en) * 1959-05-29 1963-07-02 Gen Electric Co Ltd Devices for wrapping and removing wrapped connections
US3078052A (en) * 1960-06-30 1963-02-19 Gardner Denver Co Conductor wrapping device
US3143307A (en) * 1962-10-31 1964-08-04 Gardner Denver Co Conductor wrapping bit
US3244202A (en) * 1963-12-05 1966-04-05 Ibm Wire wrapping devices

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788367A (en) * 1971-11-03 1974-01-29 Universal Instruments Corp Wire wrap tool
US3781932A (en) * 1971-12-16 1974-01-01 Gardner Denver Co Cutting, stripping, and wrapping bit for insulated conductor wire
US3882906A (en) * 1972-06-30 1975-05-13 Siemens Ag Wire winding machine
US3903935A (en) * 1972-08-15 1975-09-09 Post Office Wire wrapping apparatus
US3967661A (en) * 1975-09-17 1976-07-06 Vector Electronic Company Insulation slitting and wire wrapping tool
US4051875A (en) * 1977-01-31 1977-10-04 Gardner-Denver Company Conductor wrapping bit
US5036578A (en) * 1990-06-11 1991-08-06 Ok Industries Inc. Cutting, stripping and wire-wrapping hand tool
US20170174089A1 (en) * 2015-12-21 2017-06-22 Delphi Technologies, Inc. Conductor Winding Tool And Battery Charger Having The Same
US9975437B2 (en) * 2015-12-21 2018-05-22 Delphi Technologies Inc. Conductor winding tool and battery charger having the same

Also Published As

Publication number Publication date
DE2019983A1 (de) 1970-12-17
GB1250255A (enExample) 1971-10-20
DE2019983B2 (de) 1973-07-12
DE2019983C3 (de) 1974-02-07

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