US3248062A - Wire wrapping device - Google Patents

Wire wrapping device Download PDF

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Publication number
US3248062A
US3248062A US340900A US34090064A US3248062A US 3248062 A US3248062 A US 3248062A US 340900 A US340900 A US 340900A US 34090064 A US34090064 A US 34090064A US 3248062 A US3248062 A US 3248062A
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US
United States
Prior art keywords
wire
bit
sleeve
forward end
wrapping
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
Application number
US340900A
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English (en)
Inventor
Peter F Boomgaard
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
Original Assignee
Gardner Denver Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gardner Denver Inc filed Critical Gardner Denver Inc
Priority to US340900A priority Critical patent/US3248062A/en
Priority to GB41985/64A priority patent/GB1068854A/en
Priority to BE656283D priority patent/BE656283A/xx
Application granted granted Critical
Publication of US3248062A publication Critical patent/US3248062A/en
Anticipated expiration legal-status Critical
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

Definitions

  • the bit is provided with a longitudinal terminal-receiving recess and a radially offset wire receiving groove.
  • these prior art devices are intended to connect opposite end portions of a conductor to spaced terminals to establish an electrical circuit between the terminals.
  • a bare end portionof the conductor is initially inserted into the wire receiving groove of the bit; and, in a well understood manner, the end portion is wrapped or drawn about a terminal in response to rotation of the bit about the terminal.
  • the conductor To effect wrapping of the wire about the terminal, rotation of the conductor along with the bit must be restrained; therefore, at a point along its length located axially forwardly of the opening of the wire-receiving groove, the conductor is usually bent radially outwardly with respect to the axis of the bit and is seated in a notch formed in the forward end of the stationary sleeve.
  • a recently developed application for wrapped wire connections contemplates binding two or more terminals together to complete an electrical circuit.
  • This type of connection is known as a bound joint and is formed when two sharp-edged terminals are secured together with their side surfaces in contact by wrapping a wire thereabout in tight helical convolutions.
  • the wrapping wire of the bound joint is not necessarily intended to electrically connect the terminals bound thereby to any other terminal; and, in this respect, bound joints depart from conventional wrapped connections wherein a conductor has its opposite ends secured to spaced terminals.
  • Bound joints produced with conventional wire wrapping devices of the type described above have been unsatisfactory because the aforementioned outwardly bent portion of the wire which engages the sleeve to hold the wire against rotation with the bit forms a pigtail extending laterally from the terminal.
  • the lateral extent of such pigtails may be sufficient to bring the same into unwanted shorting contact with an adjacent terminal or other circuit component.
  • such a follow-up step decreases the efiiciency of the operation and substantially increases costs.
  • additional time and effort are conventionally consumed in manually bending the wire laterally for holding engagement with the sleeve.
  • the present invention contemplates an improved wire wrapping device for bound terminals which will overcome the above noted deficiencies of known devices presently employed for this purpose.
  • Another object is to provide an improved sleeve for a wire wrapping bit having a wire holding portion in substantial alignment with the wire-receiving groove of the ICe bit thereby obviating lateral bending of the wire in order to effect holding engagement with the sleeve.
  • Yet another object is to provide an improved wire wrapping device into which a wire can be loaded in a more simple and time saving manner than has been possible heretofore.
  • Still another object is to provide a wire wrapping device having an improved bit sleeve for holding a wire so that no portion of the wire projects outwardly from the sleeve.
  • FIG. 1 is a side elevational view of a wire wrapping tool incorporating a bit and sleeve which embody the present invention
  • FIG. 2 is an enlarged isometric view of the front end of the bit and sleeve shown in FIG. 1;
  • FIG. 3 is a view in perspective of a wire bound joint between a pair of terminals
  • FIG. 4 is an enlarged end elevational view of the bit I and sleeve shown in FIGS. 1 and 2;
  • FIG. 5 is a fragmentary sectional view taken substantially along lines 5-5 of FIG. 4;
  • FIG. 6 is a view similar to FIG. 4 wherein said bit is rotated clockwise through FIG. 7 is a fragmentary sectional view'taken substan tially along lines 77 of FIG. 6;
  • FIG. 8 is a view similar to FIGS. 4 and 6 wherein the bit has been rotated through several revolutions;
  • FIG. 9 is a fragmentary sectional view taken substantially along lines 99 of FIG. 8.
  • FIG. 10 isv a fragmentary plan view of the sleeve with a portion thereof broken away to show details of the wire holding slot.
  • the sleeve 12 comprises an elongated cylinder having an mside diameter substantially corresponding to the outside diameter of the bit 18. Abutment of the enlarged bit end 19 with the extreme rear end of the sleeve prevents axial displacement of the ,bit forwardly within the sleeve; and, as shown in FIG. 5, for example, the bit and sleeve are so dimensioned that the front or forward end of bit 18 is somewhat recessed within the sleeve 12.
  • An im portant aspect of this invention is accomplished by lip 22 which is integrally formed at the forward end of sleeve 12 and which will be hereinafter described in detail.
  • Bit 18 comprises an elongated shaft having a longitudinal bore or recess 24 opening axially to its forward end face 26 for receiving therein the free end of a terminal post, or the like, substantially in the manner shown in FIGS. 4 9.
  • Bit 18 Radially offset from and'parallel to the recess 24 is a groove 28 opening to the outer cylindrical surface of bit 18.
  • Groove 28 opens axially forwardly to the bit face 26 and is intended to receive an end portion of a wire 30 substantially in the manner shown in FIGS.
  • bit face 26 comprises axially spaced inner and outer surfaces, 32 and 34 respectively,
  • an object of this invention is to provide improved wire wrapping means for making socalled bound joints of the type illustrated in FIG. 3 of the drawings.
  • a wire such as the aforementioned wire 30, is wound or wrapped in tight, helical convolutions about a pair of rectangular terminals 38 and 40 having their wider faces in contact.
  • the terminals may project from an insulating terminal board 42 which restrains the terminals against rotation as the wire 30 is wound thereabout.
  • the sharp edges of the terminals andthe wire are matingly deformed during the wrapping operation to produce a joint having good electrical contact and mechanical stability. While the present device is primarily intended to join electrical terminals together, it
  • a device of this character may be employed to make wire bound connections between nonelectrical members of suitable size and shape.
  • Patent 3,078,052 discloses a typical sleeve having a notch at the forward end thereof for seating and holding the wire. -It will be apparent that that end portion of the wire held in either manner above described will not be wrapped closely about the terminal, but will, instead, project laterally from the terminal and the convolutions of the connection. I Since wardly over and beyond the end of the sleeve, a so-called pigtail of substantial length will be formed; and it is usually necessary to treat such a pigtail by a bending or cutting operation to avoid interterminal shorting where pairs of terminals are closely spaced on a terminal board.
  • the present invention contemplates the provision of the aforementioned lip 22 for engaging and holding portion 44 of wire 30 during the wrapping operation in such a manner that the resulting pigtail, shown at numeral 46 in FIGS. 3 and 9, will be reduced to a minimum length and will be bent forwardly in longitudinal alignment with the terminals 38 and 40.
  • present invention no time consuming, therefore costly, follow-up operations need be performed on the pigtail 46.
  • the lip 22 is integrally formed on the forward end of sleeve 12; and, as viewed in transverse cross section perpendicular to the longitudinal axis of the sleeve, comprises a segment of a circle.
  • the armate surface 48 of lip 22 is a continuation of a portion of the outer cylindrical surface of the sleeve 12; and, the chordal surface 50 and the extreme forward lip surface 52 are disposed at right angles to one another.
  • the lip may be said to depend radially from the arcuate surface 48 to place the chordal lip surface 50 in substantial registration with the bottom of the wire-receiving groove 28 In most applications of the when the sleeve and bit are disposed in the relative rotative positions shown in FIGS. 2, 4 and 5, for example.
  • a wire-holding slot 54 opens centrally and radially inwardly to the chordal lip surface 50 and extends the full axial length of lip 22.
  • the slot wall is parallel with the longitudinal axes of the sleeve .12 and the bit 18 and opens forwardly to lip surface 52 in a countersunk surface 58.
  • the slot 54 extends radially into lip 22 to a depth permitting substantial axial alignment with the wire receiving groove 28 when the bit 18 is rotated relative to. the sleeve to the position shown in FIGS. 2, 4 and 5.
  • power tools such as tool 10 include an indexing means, not shown, which would beoperable to align the groove 28 with slot 54 following each wrapping cycle.
  • the wire holding feature of lip 22 can be best understood by having reference to FIGS. 4-10 which show the relative positions of. the sleeve 12, bit 18 and wire 30 at successive stages of the wrapping cycle.
  • the wire 30 After the wire 30 has been cut to a predetermined length to provide the desired number of wrapped convolutions, usually three to twelve, the wire is inserted axially throughthe slot 54 i into the aligned bit groove 28 as shown in FIG. 5.
  • the countersunk surface 58 serves to guide the wire into the slot to facilitate rapid and efficient wire loading.
  • the tool 10 is advanced with respectto the terminal board 42 to locate the terminals 38 and 40 within the bit recess 24.
  • the forward end 44 of wire 30 will be held against rotation by the lip 22 due to vertically and laterally cocking of the wire between the spaced wall portions of the slot 54 substantially in the manner shown in FIG. 10.
  • Such cocking of the wire effectively resists the tendency of portion 44 to be drawn axially rearwardly and radially inwardly over an abrupt edge 60 defined at the opening of slot 54 to the chordal.
  • wire portion 44 will bend sharply about the edge 60 forming a kink indicated on wire 30 at letter A.
  • the aforedescribed cocking and kinking of wire portion 44 is effective to resist the pull acting on wire portion 44 due to the dragging and bending of the wire 30 at point B'as it emerges from the groove 28.
  • This pull on wire portion 44 tending to dislodge it from slot 54 is substantially isolated from portion 44 as soon as the wire 30 engages at point C with a sharp corner of terminal 38 as shown in FIG. 6.
  • the resulting mating deformation of the wire and terminal at point C and at each succeeding corner of the terminals provides secure mechanical attachment between the wire and the terminals usually before one complete convolution is formed about the terminals;- therefore, it is permissible that. the initial holding en-.
  • gagement between slot 54 and wire portion 44 be released in advance of completion of the wrapping operation.
  • the axial dimension of the slot be at least twice the wire diameter, and that the width of slot 54 substantially correspond to the wire diameter.
  • the outer bit surface 34 is recessed with respect to the forward end of sleeve 12 and the inner bit surface 32 is recessed with respect to the outer bit surface 34 in order to achieve camming of the wire convolutions by surface 36, as shown in FIG. 9; without destructive interference between any portion of the bit face 26 and the Wire 30 as the latter is cocked and kinked as aforedescribed.
  • a wire holding lip constructed in accordance with the teachings of the present invention may be integrally formed on the sleeve by simple machining operations without a significant increase in the cost of manufacture of standard sleeves. Moreover, the lip 22 performs its intended function without the use of moving parts thereby obviating the need for periodic adjustments or replacements of parts. Furthermore, no new operator skills need be acquired for using this improved bit sleeve.
  • a wire Wrapping device including a cylindrical sleeve having a forward end; a wrapping bit rotatably journalled in said sleeve and having a forward end adjacent the forward end of said sleeve; said bit having a longitudinal terminal-receiving recess and a radially oifset wire-receiving groove opening to the forward end thereof; the improvement comprising: means for engaging a forwardly projecting end portion of a wire received in said groove and for releasably holding said end portion against rotation with said bit as the latter is rotated about its rotative axis; said means comprising an integral lip portion of said sleeve projecting axially from the forward end thereof and defining a slot for receiving said projecting end portion of said wire; a cross section through said lip portion perpendicular to the longitudinal axis of said sleeve comprising a segment of a circle having said slot opening normal to and at the midpoint of the chordal side of said segment; and said slot opening opening
  • a wire wrapping device including a cylindrical sleeve having a forward end; a wrapping bit rotatably journalled in said sleeve and having a forward end adjacent the forward end of said sleeve; said bit having a longitudinal terminal-receiving recess and a radially ofiset wire-receiving groove opening to the forward end thereof; the improvement comprising: means for engaging a forwardly projecting end portion of a wire received in said groove and for releasably holding said end portion against rotation with said bit as the latter is rotated about its rotative axis; said means comprising an integral lip portion of said sleeve projecting axially from the forward end thereof and defining a slot for receiving said projecting end portion of said wire; said slot opening radially from said lip portion toward the rotative axis of said bit and opening axially to the forward end of said bit in substantial alignment with said wire-receiving groove; and said slot having at its forward end a countersunk wall surface.
  • a wire wrapping device including a cylindrical sleeve having a forward end; a wrapping bit rotatably journalled in said sleeve and having a forward end adjacent the forward end of said sleeve; said bit having a longitudinal terminal-receiving recess and a radially offset wire-receiving groove opening to the forward end thereof; the improvement comprising: means for engaging a forwardly projecting end portion of a wire received in said groove and for releasably holding said end portion against rotation with said bit as the latter is rotated about its rotative axis; said means comprising an integral lip portion of said sleeve projecting axially and radially from References Cited by the Examiner UNITED STATES PATENTS 6/1954 Miloche 242--7 X 2/ 1963 Olds et al 242-7 M-ERVIN STEIN, Primary Examiner.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Processing Of Terminals (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
US340900A 1964-01-29 1964-01-29 Wire wrapping device Expired - Lifetime US3248062A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US340900A US3248062A (en) 1964-01-29 1964-01-29 Wire wrapping device
GB41985/64A GB1068854A (en) 1964-01-29 1964-10-14 Wire wrapping device
BE656283D BE656283A (enrdf_load_stackoverflow) 1964-01-29 1964-11-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US340900A US3248062A (en) 1964-01-29 1964-01-29 Wire wrapping device

Publications (1)

Publication Number Publication Date
US3248062A true US3248062A (en) 1966-04-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US340900A Expired - Lifetime US3248062A (en) 1964-01-29 1964-01-29 Wire wrapping device

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Country Link
US (1) US3248062A (enrdf_load_stackoverflow)
BE (1) BE656283A (enrdf_load_stackoverflow)
GB (1) GB1068854A (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682063A (en) * 1951-06-30 1954-06-29 Bell Telephone Labor Inc Wiring tool
US3078052A (en) * 1960-06-30 1963-02-19 Gardner Denver Co Conductor wrapping device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682063A (en) * 1951-06-30 1954-06-29 Bell Telephone Labor Inc Wiring tool
US3078052A (en) * 1960-06-30 1963-02-19 Gardner Denver Co Conductor wrapping device

Also Published As

Publication number Publication date
GB1068854A (en) 1967-05-17
BE656283A (enrdf_load_stackoverflow) 1965-03-16

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