GB789272A - Improvements in and relating to screws - Google Patents

Improvements in and relating to screws

Info

Publication number
GB789272A
GB789272A GB8204/56A GB820456A GB789272A GB 789272 A GB789272 A GB 789272A GB 8204/56 A GB8204/56 A GB 8204/56A GB 820456 A GB820456 A GB 820456A GB 789272 A GB789272 A GB 789272A
Authority
GB
United Kingdom
Prior art keywords
screw
grooves
wall
central
march
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
GB8204/56A
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.)
AMERICAN SCREW CO
Original Assignee
AMERICAN SCREW CO
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 AMERICAN SCREW CO filed Critical AMERICAN SCREW CO
Publication of GB789272A publication Critical patent/GB789272A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B15/00—Screwdrivers
    • B25B15/001—Screwdrivers characterised by material or shape of the tool bit
    • B25B15/004—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section
    • B25B15/005—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with cross- or star-shaped cross-section
    • 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
    • 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
    • Y10S411/919—Screw having driving contacts

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Surgical Instruments (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

789,272. Screw - heads. AMERICAN SCREW CO. March 15, 1956 [March 16, 1955], No. 8204/56. Class 89(2) A screw has a tool-receiving recess 11 in its end 10 extending along its longitudinal axis, and comprising a central portion 12 and grooves 13 extending outwardly from the portion with their substantiallyvertical medial-planes parallel to but spaced from true radial-planes. The driving-wall 15 of each groove lies closer to the true radial-plane than does the other wall 16, and in one arrangement, is coincident with said plane. Adjacent walls 15, 16 of adjacent grooves are joined together by surfaces 17, 18 of the central-portion. In modifications, the surfaces 17, 18 are replaced by single oblique or curved surfaces. The bottom-wall of the central-portion is conical and may extend into a shallow cylindrical recess. The bottomwalls of the grooves extend upwardly to meet the screw-end at the periphery of the grooves.
GB8204/56A 1955-03-16 1956-03-15 Improvements in and relating to screws Expired GB789272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US494726A US2847894A (en) 1955-03-16 1955-03-16 Socketed screw head with uniformly offset grooves

Publications (1)

Publication Number Publication Date
GB789272A true GB789272A (en) 1958-01-15

Family

ID=23965712

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8204/56A Expired GB789272A (en) 1955-03-16 1956-03-15 Improvements in and relating to screws

Country Status (6)

Country Link
US (2) US2847894A (en)
BE (1) BE546137A (en)
DE (1) DE1055887B (en)
FR (1) FR1148891A (en)
GB (1) GB789272A (en)
NL (2) NL205416A (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187790A (en) * 1959-05-18 1965-06-08 Hi Shear Rivet Tool Company Screw and screw driver coupling
DE1172904B (en) * 1961-01-26 1964-06-25 Aer O Terq Inc Cross recess for head screws
US3170364A (en) * 1963-05-06 1965-02-23 Robert K Johnson Recessed head screw
US3288190A (en) * 1964-09-21 1966-11-29 John F Holmes Self-locking screw with friction reducing driving means
US3494243A (en) * 1967-06-28 1970-02-10 Standard Pressed Steel Co Sealing fastener
US4084478A (en) * 1974-09-12 1978-04-18 Phillips Screw Company Screw heads
US4355552A (en) * 1980-04-14 1982-10-26 Technofast, Inc. Recessed head screw
USD270229S (en) 1980-10-22 1983-08-23 The Eastern Company Tool and operator head for tool-operated lock
USD270424S (en) 1980-10-22 1983-09-06 The Eastern Company Tool operator for tool-operated locks
US4998454A (en) * 1988-11-14 1991-03-12 Black & Decker Inc. Screwdriver bit for phillips-head fasteners
EP0942807B1 (en) * 1996-12-05 2000-08-23 WERA WERK HERMANN WERNER GmbH & CO. Screwdriver or screwdriver attachment
US6223634B1 (en) 1997-10-03 2001-05-01 Phillips Screw Company Recessed head fastener and driver systems
US5957645A (en) 1997-10-31 1999-09-28 Phillips Screw Company Spiral drive system for threaded fasteners
US6164171A (en) * 1998-03-13 2000-12-26 Max Co., Ltd. Screwdriver used for screw tightener and screw suitably tightened by the screwdriver
US6199455B1 (en) 1999-03-08 2001-03-13 Jjct Enterprises, Inc. Driver, fastener and forming tool
US7293949B2 (en) * 2004-04-15 2007-11-13 Phillips Screw Company Spiral drive fastener with friction engageable surface
US7316535B2 (en) * 2005-11-14 2008-01-08 Ling-Fang Chen Screw with a convenient screw head
EP2283241A4 (en) * 2008-04-21 2012-04-04 Asia Fastening Us Inc Drive system
US8291795B2 (en) * 2010-03-02 2012-10-23 Phillips Screw Company Fastener system with stable engagement and stick fit
US10995788B2 (en) 2017-12-15 2021-05-04 Phillips Screw Company Stick fit fastener recess system
US11466720B2 (en) 2017-12-15 2022-10-11 Phillips Screw Company Stick fit fastener recess system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US101207A (en) * 1870-03-29 Improvement in screw and screw-driver
USRE15483E (en) * 1922-10-31 stirling
US1797390A (en) * 1929-02-04 1931-03-24 Frederick H Wood Screw driver designed to be keyed on a screw
US1956963A (en) * 1931-05-09 1934-05-01 Jr Fred Salmen One way screw
US2216382A (en) * 1939-11-01 1940-10-01 W H Holmes Screw
US2304704A (en) * 1939-12-04 1942-12-08 Winslow Foster Screw
AT175424B (en) * 1942-12-30 1953-07-10 Guest Keen & Nettlefolds Ltd Screw whose head has a recess for the attack of a screwdriver
US2445978A (en) * 1945-05-07 1948-07-27 Domnic V Stellin Socket head screw
US2592462A (en) * 1951-09-11 1952-04-08 Res Eng & Mfg Recessed head fastener

Also Published As

Publication number Publication date
USRE24878E (en) 1960-09-27
FR1148891A (en) 1957-12-17
DE1055887B (en) 1959-04-23
BE546137A (en)
NL100665C (en)
NL205416A (en)
US2847894A (en) 1958-08-19

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