US3099704A - Threaded plastic rod with mold burr for locking function - Google Patents

Threaded plastic rod with mold burr for locking function Download PDF

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Publication number
US3099704A
US3099704A US653794A US65379457A US3099704A US 3099704 A US3099704 A US 3099704A US 653794 A US653794 A US 653794A US 65379457 A US65379457 A US 65379457A US 3099704 A US3099704 A US 3099704A
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United States
Prior art keywords
burr
locking function
plastic rod
threaded plastic
bolts
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
US653794A
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English (en)
Inventor
Naimer Hubert
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Individual
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2618—Moulds having screw-threaded mould walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D1/00—Producing articles with screw-threads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/006—Non-metallic fasteners using screw-thread
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/041—Releasable devices
    • F16B37/043—Releasable devices with snap action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/08—Quickly-detachable or mountable nuts, e.g. consisting of two or more parts; Nuts movable along the bolt after tilting the nut
    • F16B37/0871—Quickly-detachable or mountable nuts, e.g. consisting of two or more parts; Nuts movable along the bolt after tilting the nut engaging the bolt laterally, i.e. without the need to engage the end of the bolt
    • F16B37/0885—Quickly-detachable or mountable nuts, e.g. consisting of two or more parts; Nuts movable along the bolt after tilting the nut engaging the bolt laterally, i.e. without the need to engage the end of the bolt in two halves hingedly connected
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/64—Encased switches adapted for ganged operation when assembled in a line with identical switches, e.g. stacked switches
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/904—Fastener or fastener element composed of nonmetallic material
    • Y10S411/907—Elastomeric
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/924—Coupled nut and bolt
    • Y10S411/947—Elastic-gripping action

Definitions

  • FIGS. 1 and 2 of the drawing The laminated core of an electromagnetic device or a switch as is diagrammatically shown in FIGS. 1 and 2 of the drawing may be referred to as ⁇ examples.
  • FIG. l is a side View, partly in section, ot a switch composed of four identical units
  • FIG. 2 is a top plan view of a switch unit. The problem with which the invention is concerned may be set forth iirst with reference to the latter iigure.
  • FIGS. l and 2 which is shown in the left-hand part of FIG. l in a sectional view taken on line l--l of FIG. 2 and in the right-hand pant of FIG. l in a sectional View taken on line Ia-Ia of FIG. 2, whereas the latter is a sectional view taken on line II-II of FIG. l.
  • the switch which is apparent trom said iigures has an operating shaft 1 provided with cams 2, which coact with rollers 3 acting by means of forks 4 on plungers ⁇ 5, with which the jumper bridges 6 are connected, which can be lifted against the action of the closing springs 7 from the countercontacts t5 having terminals 9.
  • the shaft 1 extends through the bottoms of casing parts 10, lila, ltlb, 10c and a cover 11 and may be rotatably supported in known manner.
  • the shafts 12 of the rollers 3 extend through the prongs of the forks 4 and are guided in slots 13l formed in the casing part l-liic and in the cover 11.
  • the casing parts 1ti-1ilc and the cover 11 are held together by four tie bolts 15.
  • Such a switch construction is known.
  • the number of casings 10 may vary within wide limits.
  • the invention is concerned more particularly with a special construction of tie rods of substantial length, illustrated by the bolts 15, which are found wherever several or many structural parts must lbe held together by tie rods, the length of which is a multiple of their diameter.
  • tie rods consist in practice generally of metal and owing to their considerable length are not designed as headed screws but represent bolts having screw threads at both ends for threaded engagement with a nut with locking ring or with a double nut. S-uch a -bolt is apparent from FIG. 3.
  • the tie rod consists in most cases of iron but in that case it must be given a surface protection, in most cases by Ielectro-cadniiumplating, electro-galvanizing, electro-nickelplating or the like. This is necessary because the switch (or another electrical apparatus) is often used in aggressive atmospheres or in moist rooms.
  • the screw thread is either produced by machining or in a thread rolling machine. This requires in the iirst case tools subject to a particularly high wear and in the second case also an expensive machine. Similar requirements exist regarding the nuts, the screw thread of which must in any case be cuit. Thus the making of such bolts takes considerable time.
  • the tension element consists exclusive-ly of -a thermoplastically deformable, electrically-insulating plastic, which is of high tensile strength and is moderately ilexible and tough ⁇ at normal temperatures, and is equal to or better than polyamide-base plastic in all said propenties.
  • Superpolyamides have proved particularly satisfactory in that connection.
  • Superpolyamides have a melting point of about 200 C. and a strength which is suiicient for the present purposes in a temperature range of 20 to at least +l30 C. In that temperature range their tensile strength is 50G-600 lig/sq. cm., which is less than that of iron. This can easily be compensated by the fact that owing to the excellent insulating properties of said plastics no consideration has to be given Iany longer to creep paths. Thus the diameter of the plastic tie bolt can be increased and yet the bolt can be disposed more closely to the live parts. It must also be considered that tension members of iron are generally overdimensioned in a high degree.
  • thermoplastics are thermoplastic they can be made by injection moulding in multiple moulds, with head and screw thread, so that the separate forming of the screw thread is eliminated as well as any surface iinishing treatment. Owing to the elastic properties of such plastics, split locking rings and the like are eliminated and it is easily possible to connect the nut and bolt by local welding with the aid of a soldering iron or the like to permanently and perfectly secure them against undesired opening, particularly if the nut consists also of thermoplastic material. It is thus apparent that the Substitution of the usual tie rods of metal by tie rods of thermoplastically shaped suitable plastics ensures important advantages not only from manufacturing but also from the design aspect.
  • ⁇ Electrically non-conductive screws which consist of a metal core and a plastic covering which forms the screw thread and the screw head.
  • the metal core has a ribbed surface with which it is embedded in the plastic to ensure a torsion-resistant and tension-resistant connection therewith.
  • That prior proposal relates to a countersunk screw rather than to a tie rod; whereas a countersunk screw cooperates with the nut thread, as a rule, over a length which is a multiple of the diameter of the pin, this is not the case with tie bolts acting in the manner of a screw or rivet.
  • tension-stressed structural elements of the present type can be made entirely of thermoplastics and the use of metal cores can be entirely eliminated and that it is also possible to provide tension elements which combine the advantages of perfect insulation with suiiicient strength and moderate plasticity, and which are formed with force-transmitting surfaces .which are subjected to shearing stress and are not larger or not substantially larger than in the case of a pure metal construction. -It is also not new to use rivets of thermoplastics; this applies also to electrical apparatus.
  • the present tie rod 20 may substantially take the form of a headed screw of metal. Contrary to metal tie rods the head 21 may now be provided because its formation in an injection mould involves no diculties and the mould may easily be adapted to the manufacture of ties of dilerent length by means of intermediate mould sections.
  • the screw thread 22 is also produced in the mould and is used 'without any subsequent machining.
  • the (exaggeratedly shown) burr 23, which is due to the mould is not removed, for reasons which Will be described hereinafter.
  • plastic tie rods according to the invention consists in that when constructed as threaded bolts they can easily be made self-locking. 'lf the spontaneously formed burr 23, which is due to the split injection mould, is left on the bolt 20, as is apparent from FIG. 4, the burr will be deformed by the nut 24 when the latter is subsequently applied to the bolt. This has proved an excellent lock for the nut even if the same does not consist of plastics (the invention being not restricted to the use of plastic nuts). r'That burr need not be thicker than the one which is formed where good moulds are used. -It is obvious that such -a burr may also be provided in the nut itself.
  • a tension-stressed tie rod interconnecting a plurality of aligned parts of an electrical apparatus, said rod having a length which is a multiple of its diameter and consisting of a thermoplastic resin at least equivalent to polyamide plastics in thermoplastic deformability, tensile strength, electrical insulating power, ilexibility and toughness at normal temperatures), said rod being injection molded in a mold having two mold parts with meeting faces and having at least one threaded end portion, and further comprising an axially extending ridge-like burr formed as an integral portion of said threaded end portion at the meeting faces of the mold and extending radially beyond the threaded crest.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Connection Of Plates (AREA)
  • Transformers For Measuring Instruments (AREA)
US653794A 1956-04-23 1957-04-19 Threaded plastic rod with mold burr for locking function Expired - Lifetime US3099704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT352536X 1956-04-23

Publications (1)

Publication Number Publication Date
US3099704A true US3099704A (en) 1963-07-30

Family

ID=3672479

Family Applications (1)

Application Number Title Priority Date Filing Date
US653794A Expired - Lifetime US3099704A (en) 1956-04-23 1957-04-19 Threaded plastic rod with mold burr for locking function

Country Status (7)

Country Link
US (1) US3099704A (enrdf_load_stackoverflow)
BE (1) BE556862A (enrdf_load_stackoverflow)
CH (2) CH352536A (enrdf_load_stackoverflow)
DE (1) DE1159075B (enrdf_load_stackoverflow)
FR (1) FR1174210A (enrdf_load_stackoverflow)
GB (1) GB861774A (enrdf_load_stackoverflow)
NL (1) NL216114A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655517A (en) * 1985-02-15 1987-04-07 Crane Electronics, Inc. Electrical connector
US20170203477A1 (en) * 2016-01-14 2017-07-20 Tennant Company Thread forming apparatus and method for rotationally molded product

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7612574U1 (de) * 1976-04-22 1976-08-26 Brown, Boveri & Cie Ag, 6800 Mannheim Explosionsgeschützter Paketnockenschalter
DE3322775A1 (de) * 1983-06-24 1985-01-17 SWF Auto-Electric GmbH, 7120 Bietigheim-Bissingen Schaltgeraet
EP0183888A1 (en) * 1984-10-30 1986-06-11 Aktiebolaget Ivar Ericson Attachment device
DE8908823U1 (de) * 1989-07-20 1989-09-14 Dörr, Wolfgang, 7016 Gerlingen Schraubglied mit Muttergewinde

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1062000A (en) * 1912-12-31 1913-05-20 Elgy Hahn Nut construction.
US1640433A (en) * 1926-07-20 1927-08-30 Gen Electric Insulating element
US1717287A (en) * 1926-08-05 1929-06-11 Gen Electric Insulating rod
US2320947A (en) * 1942-01-24 1943-06-01 American Bosch Corp Fastening means
US2533894A (en) * 1946-01-16 1950-12-12 Howard I Podell Turnbuckle or the like
US2551834A (en) * 1947-06-09 1951-05-08 Presstite Engineering Company Protective plastic cap
US2568640A (en) * 1948-08-21 1951-09-18 James H Kindelberger Self-locking bolt
US2613397A (en) * 1946-05-29 1952-10-14 Owens Corning Fiberglass Corp Manufacture of molded articles
US2624916A (en) * 1951-02-19 1953-01-13 Du Pont Glossy molding process for ethylene polymers
US2664023A (en) * 1951-11-30 1953-12-29 Mugford Ronald Snap-on split nut
US2754546A (en) * 1951-11-13 1956-07-17 Firestone Tire & Rubber Co Mold
US2769202A (en) * 1953-07-10 1956-11-06 Earl H Thompson Molding apparatus
US2890845A (en) * 1955-05-31 1959-06-16 Kiekhaefer Elmer Carl Outboard motor clamp screw

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE451670C (de) * 1924-11-07 1927-10-31 Elfa Elektrotechnische Fabrik Schaltapparat mit magnetischer Lichtbogenausblasung
BE456185A (enrdf_load_stackoverflow) * 1943-06-12
BE508130A (enrdf_load_stackoverflow) * 1951-01-02
DE1685016U (de) * 1954-04-01 1954-10-14 Licentia Patenverwaltungs G M Lamellierter magnetkern, insbesondere fuer relais, schuetz od. dgl.
DE1721790U (de) * 1956-03-02 1956-05-09 Norddeutsche Mende Rundfunk G Aus kunststoff bestehende drehachse fuer veraenderbare elektrische regelorgane.

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1062000A (en) * 1912-12-31 1913-05-20 Elgy Hahn Nut construction.
US1640433A (en) * 1926-07-20 1927-08-30 Gen Electric Insulating element
US1717287A (en) * 1926-08-05 1929-06-11 Gen Electric Insulating rod
US2320947A (en) * 1942-01-24 1943-06-01 American Bosch Corp Fastening means
US2533894A (en) * 1946-01-16 1950-12-12 Howard I Podell Turnbuckle or the like
US2613397A (en) * 1946-05-29 1952-10-14 Owens Corning Fiberglass Corp Manufacture of molded articles
US2551834A (en) * 1947-06-09 1951-05-08 Presstite Engineering Company Protective plastic cap
US2568640A (en) * 1948-08-21 1951-09-18 James H Kindelberger Self-locking bolt
US2624916A (en) * 1951-02-19 1953-01-13 Du Pont Glossy molding process for ethylene polymers
US2754546A (en) * 1951-11-13 1956-07-17 Firestone Tire & Rubber Co Mold
US2664023A (en) * 1951-11-30 1953-12-29 Mugford Ronald Snap-on split nut
US2769202A (en) * 1953-07-10 1956-11-06 Earl H Thompson Molding apparatus
US2890845A (en) * 1955-05-31 1959-06-16 Kiekhaefer Elmer Carl Outboard motor clamp screw

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655517A (en) * 1985-02-15 1987-04-07 Crane Electronics, Inc. Electrical connector
USRE33005E (en) * 1985-02-15 1989-08-01 Crane Electronics, Inc. Electrical connector
US20170203477A1 (en) * 2016-01-14 2017-07-20 Tennant Company Thread forming apparatus and method for rotationally molded product
US11224998B2 (en) * 2016-01-14 2022-01-18 Tennant Company Thread forming apparatus and method for rotationally molded product

Also Published As

Publication number Publication date
NL216114A (enrdf_load_stackoverflow)
CH352536A (de) 1961-02-28
CH353580A (de) 1961-04-15
DE1159075B (de) 1963-12-12
GB861774A (en) 1961-02-22
FR1174210A (fr) 1959-03-09
BE556862A (enrdf_load_stackoverflow)

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