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GB427893A - Improvements in screws - Google Patents

Improvements in screws

Info

Publication number
GB427893A
GB427893A GB29905/33A GB2990533A GB427893A GB 427893 A GB427893 A GB 427893A GB 29905/33 A GB29905/33 A GB 29905/33A GB 2990533 A GB2990533 A GB 2990533A GB 427893 A GB427893 A GB 427893A
Authority
GB
United Kingdom
Prior art keywords
screws
curved surfaces
tapering inwardly
recess
fitzpatrick
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
GB29905/33A
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.)
FITZPATRICK CORP
Original Assignee
FITZPATRICK CORP
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 FITZPATRICK CORP filed Critical FITZPATRICK CORP
Publication of GB427893A publication Critical patent/GB427893A/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
    • F16B23/0023—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 cross-shaped
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

427,893. Screws. FITZPATRICK CORPORATION, 421, 5th Avenue, Portland, Oregon, U.S.A. Oct. 27, 1933, No. 29905. Convention date, May 9. [Classes 89 (i) and 89 (ii)] The driving recess of a screw is formed by opposing slots 8 tapering inwardly and connected by convexly curved surfaces 6 also tapering inwardly. In a modification the curved surfaces 6 are replaced by convex polyhedral surfaces. The bottom of the recess is conical. Specification 427,892, [Group XXIII], is referred to.
GB29905/33A 1933-05-09 1933-10-27 Improvements in screws Expired GB427893A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427893XA 1933-05-09 1933-05-09

Publications (1)

Publication Number Publication Date
GB427893A true GB427893A (en) 1935-04-29

Family

ID=21923753

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29905/33A Expired GB427893A (en) 1933-05-09 1933-10-27 Improvements in screws

Country Status (3)

Country Link
BE (1) BE399538A (en)
FR (1) FR763484A (en)
GB (1) GB427893A (en)

Also Published As

Publication number Publication date
BE399538A (en)
FR763484A (en) 1934-05-01

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