CA919962A - Recessed screw having rounded re-entrant surfaces - Google Patents

Recessed screw having rounded re-entrant surfaces

Info

Publication number
CA919962A
CA919962A CA919962A CA919962DA CA919962A CA 919962 A CA919962 A CA 919962A CA 919962 A CA919962 A CA 919962A CA 919962D A CA919962D A CA 919962DA CA 919962 A CA919962 A CA 919962A
Authority
CA
Canada
Prior art keywords
rounded
recessed screw
entrant surfaces
entrant
recessed
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
Application number
CA919962A
Inventor
Dreger Geoffrey
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.)
PL Robertson Manufacturing Co Ltd
Original Assignee
PL Robertson Manufacturing Co Ltd
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 PL Robertson Manufacturing Co Ltd filed Critical PL Robertson Manufacturing Co Ltd
Application granted granted Critical
Publication of CA919962A publication Critical patent/CA919962A/en
Expired 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
    • F16B23/003—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 star-shaped or multi-lobular, e.g. Torx-type, twelve-point star

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
CA919962A 1970-12-18 1970-12-18 Recessed screw having rounded re-entrant surfaces Expired CA919962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA100980 1970-12-18

Publications (1)

Publication Number Publication Date
CA919962A true CA919962A (en) 1973-01-30

Family

ID=4088277

Family Applications (1)

Application Number Title Priority Date Filing Date
CA919962A Expired CA919962A (en) 1970-12-18 1970-12-18 Recessed screw having rounded re-entrant surfaces

Country Status (3)

Country Link
CA (1) CA919962A (en)
DE (1) DE2162503A1 (en)
GB (1) GB1360644A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2546584B1 (en) * 1983-05-26 1985-08-30 Decaut Et Btr Reunis REDUCED FEET BODY IN RELATION TO SIX HOLLOW HEADS
DE4413782A1 (en) * 1994-04-20 1994-09-15 Siegfried Mehl Screw
DE19923855C2 (en) * 1999-05-25 2003-06-26 Werner Hermann Wera Werke Security screw and associated screwing tool
DE10321284A1 (en) * 2003-05-13 2004-12-16 Richard Bergner Verbindungstechnik Gmbh & Co. Kg Screw has conventional hexagonal recess in its head, but recessed lobes extend from its sides, giving extra purchase when special tool is used to tighten it, but allowing it to be loosened in emergency using standard tool
US11458071B2 (en) 2017-05-11 2022-10-04 Scalpal Llc Torque enhancer device for grasping and tooling, and assemblies and uses thereof
US11969864B2 (en) 2017-05-11 2024-04-30 Scalpal Llc Multi-tier torque enhancer driver and/or receiver and method of using same
DE102020005132A1 (en) 2020-08-17 2022-02-17 Sascha Klees Internal octagonal screw drive and the associated bit - device for cordless screwdrivers, assembly robots and commercial production machines

Also Published As

Publication number Publication date
GB1360644A (en) 1974-07-17
DE2162503A1 (en) 1972-07-13

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