EP0057173A1 - Dispositif de fixation du type a vis et fabrication de celui-ci - Google Patents

Dispositif de fixation du type a vis et fabrication de celui-ci

Info

Publication number
EP0057173A1
EP0057173A1 EP19800901478 EP80901478A EP0057173A1 EP 0057173 A1 EP0057173 A1 EP 0057173A1 EP 19800901478 EP19800901478 EP 19800901478 EP 80901478 A EP80901478 A EP 80901478A EP 0057173 A1 EP0057173 A1 EP 0057173A1
Authority
EP
European Patent Office
Prior art keywords
head
shank
slot
fastener
die
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.)
Withdrawn
Application number
EP19800901478
Other languages
German (de)
English (en)
Inventor
Kevin Paul Castles
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0057173A1 publication Critical patent/EP0057173A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
    • F16B23/0015—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool substantially rectangular, e.g. one-slot head

Definitions

  • This invention relates to an improved threaded fastener, and an apparatus and method for producing same and a driving tool such as a screw-driver for use with the fastener.
  • a driving tool such as a screw-driver for use with the fastener.
  • the present invention is described in relation to a screw but it is equally applicable to other fasteners.
  • the invention provides a threaded fastener having a head and a shank.
  • the head has a slot having a base wall which is modified in accordance with the following discussion so as to provide a greater torque than is provided with conventional fasteners and which can be used with a greater of driving tools such as screwdriver angles than compared to conventional fasteners.
  • DISCLOSURE OF THE INVENTION The present invention relates to a threaded fastener comprising a threaded shank and a head at one end thereof, the head including at least one slot traversing the head adapted to receive a driving tool, the or each slot having a base wall of substantially convex configuration when viewed from the head end along the longitudinal axis of the shank.
  • Another feature of the present invention relates to a method of forming a threaded fastener comprising cold forming a fastener blank having a shank and a roughformed head, punching said blank in a finishing die to simultaneously finish the head and form said slot, a roll forming said thread on the shank while removing any excess metal extruded in the slot punching step.
  • an apparatus for producing the tlireaded fasteners comprising a die to support the fastener blank, a punch to cooperate with said die to form the finished head and the slot, and a shank threader and excess metal removal means .
  • the invention also includes within its scope a driving tool for use with a threaded fastener, the tool having a blade portion with a leading edge of complementary shape to the base of the fastener slot.
  • the threaded fastener of the invention is preferably a screw.
  • the head of the fastener has an end face which may adopt any suitable configuration such as substantially planar or flat or alternatively being domed or most preferably countersunk.
  • the body of the fastener head may have any convenient configuration such as cylindrical.
  • the body of the "head" may be indistinguishable from the body of the shank each having the same diameter.
  • the threaded fastener of the invention will have a threaded shank and a head having the modified slot.
  • the fastener head has a slot which is formed as a substantially U-shaped channel traversing the head. Desirably, the slot is located in the mid- region of the head.
  • the base wall of the slot is of substantially convex configuration when viewed from the head end along the longitudinal axis of the shank.
  • the base wall is most desirably symmetrical having regard to the longitudinal axis of the shank.
  • the convex base wall of the slot may have any suitable degree of curvature. However, it is preferred when the head end has a circular periphery that the convex base wall has a surface of radius of curvature substantially equal to the diameter of the head.
  • the peak or uppermost point of the base wall of the slot may be located only a relatively short distance from the face of the head remote from the shank when compared to the corresponding distance of the base wall of the slot in conventional fasteners.
  • the shank of the fastener of the invention may adopt any standard configuration which is available in relation to conventional fasteners.
  • the shank may have a substantially cylindrical body or a body which converges towards its end remote from the head.
  • the shank has a threaded portion any may also have an unthreaded portion intermediate the screw head and the threaded portion of the shank.
  • the die used in the punching step be employed.
  • the die used in the apparatus for producing the threaded fastener is preferably adapted to support a countersunk screw.
  • the shank threader and excess metal removal means may comprise a thread rolling die having opposed operative surfaces at least one of which reciprocates relative to the other.
  • the operative surfaces of the die gradually converge along the longitudinal axis of the die.
  • Each operative surface generally includes a ribbed formation to produce the desired thread on a shank and adjacent one edge of each surface, a longitudinally extending roughened bevelled surface to remove excess metal.
  • the driving tool of the invention may include a handle portion and a blade portion with a leading edge as in conventional driving tools but wherein the leading edge has a concave configuration. It will be appreciated that the provision of a convex configuration in the base wall of the fastener slot will provide such a fastener with a number of advantages when compared to conventional fasteners. This applies with even greater emphasis when a driving tool of the invention is also utilized.
  • the fastener may be driven into a supporting surface with greater torque than is possible with conventional fasteners. In fact a satisfactory torque can be imparted to the head of the fastener even when the longitudinal axis of the driving tool does not coincide with the longitudinal axis of the fastener.
  • the fastener may be driven into the supporting surface in the desired direction (normally at right angles to the supporting surface) even when the axis of the driving tool is operated at an angle to the axis of the fastener.
  • Fig. 1 is a perspective view of the fastener blank produced by cold forming
  • Fig. 2 is a perspective view of a punch and finishing die
  • Fig. 3 is a cross-section view along line III-III in Fig. 2 ;
  • Fig. 4 is a perspective view; partially in cross-section of the fastener blank after punching;
  • Fig. 5 is a perspective view of a thread rolling and head deburring die
  • Fig. 6 is a fragmentary view of a threaded fastener in accordance with an embodiment of the present invention shown as a countersunk screw.
  • Fig. 1 there is illustrated a fastener blank 1 having a cylindrical shank 2 and a rough-formed countersunk head 3.
  • the blank 1 may be the product of cold forming a suitable length of rod or round wire from which the blank
  • Fig. 2 illustrates an enlarged punch 5 having a cylindrical body 6 and an end face 7 forming a die 7a which is capable of imparting a convex slot in the countersunk head 3.
  • the die 4 comprises a mould
  • the shank 2 of blank 14 of Fig. 4 is then subjected to a thread rolling die 15 of the construction shown in Fig. 5
  • the die 15 is provided with opposed operative surfaces 19 having threaded ribs 16 and threaded grooves 16a arranged in the usual screw forming pattern.
  • the die also contains a bevelled deburring face 17, which extends longitudinally of the die 15, having a roughened surface 18 which when in contact with the burrs 12 of blank 14 removes the burrs.
  • the burrs 12 on the finished head 11 simultaneously contact the roughed surface 18 and are removed by shearing.
  • the final product obtained following the thread rolling and deburring operation is a threaded fastener of the present invention as shown in Fig. 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

Dispositif de fixation filete possedant une tete (11) avec une fente (13) convexe et une tige (2). Un outil d'entrainement possedant une lame avec un bord de forme complementaire a celle de la base convexe de la fente du dispositif de fixation. Procede et dispositif permettant de former le dispositif de fixation filete par (a) formage a froid d'une ebauche (1) du dispositif de fixation; (b) etampage de l'ebauche au moyen d'un poincon (5) dans une matrice (4) et (c) formage du filetage de la tige (2) dans un dispositif de formage a rouleau (15).
EP19800901478 1980-08-05 1980-08-05 Dispositif de fixation du type a vis et fabrication de celui-ci Withdrawn EP0057173A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU1980/000043 WO1982000504A1 (fr) 1980-08-05 1980-08-05 Dispositif de fixation du type a vis et fabrication de celui-ci

Publications (1)

Publication Number Publication Date
EP0057173A1 true EP0057173A1 (fr) 1982-08-11

Family

ID=3759349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800901478 Withdrawn EP0057173A1 (fr) 1980-08-05 1980-08-05 Dispositif de fixation du type a vis et fabrication de celui-ci

Country Status (2)

Country Link
EP (1) EP0057173A1 (fr)
WO (1) WO1982000504A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566068A1 (fr) * 1984-06-18 1985-12-20 Garcin F Vis perfectionnee et tournevis permettant de l'actionner
US5269209A (en) * 1992-10-20 1993-12-14 Baker David R Curvilinear drive screwdriver and screw

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2258326A (en) * 1940-02-23 1941-10-07 Grant J Holt Screwhead
DE871232C (de) * 1950-10-31 1953-04-13 Erich Dipl-Ing Aue Schlitzschraube
US3411396A (en) * 1966-02-21 1968-11-19 Torrington Co Screw head with inclined driving recess
US3429162A (en) * 1966-12-19 1969-02-25 Reed Rolled Thread Die Co Means for deburring screw heads
AU448917B2 (en) * 1969-07-10 1974-05-13 Punch and die devices
AU438180B2 (en) * 1972-06-27 1973-07-17 Screw and screwdriver combination
SU492337A2 (ru) * 1974-07-22 1975-11-25 Предприятие П/Я Х-5618 Устройство дл зачистки заусенцев на головках винтов во врем накатки резьбы плашками
GB1498827A (en) * 1975-03-25 1978-01-25 Barlow J Screw and screwdriver
US4073210A (en) * 1976-09-10 1978-02-14 Katsuyuki Totsu Screw
AU4383179A (en) * 1979-02-01 1980-08-07 Kevin Paul Castles Screws

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8200504A1 *

Also Published As

Publication number Publication date
WO1982000504A1 (fr) 1982-02-18

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Effective date: 19820930