GB1223900A - Improvements in or relating to tamperproof screws - Google Patents

Improvements in or relating to tamperproof screws

Info

Publication number
GB1223900A
GB1223900A GB3647168A GB3647168A GB1223900A GB 1223900 A GB1223900 A GB 1223900A GB 3647168 A GB3647168 A GB 3647168A GB 3647168 A GB3647168 A GB 3647168A GB 1223900 A GB1223900 A GB 1223900A
Authority
GB
United Kingdom
Prior art keywords
screwdriver bit
relating
july
rotated
screws
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
GB3647168A
Inventor
John Hilton Turnbull
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.)
GKN Screws and Fasteners Ltd
Original Assignee
GKN Screws and Fasteners 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 GKN Screws and Fasteners Ltd filed Critical GKN Screws and Fasteners Ltd
Priority to GB3647168A priority Critical patent/GB1223900A/en
Publication of GB1223900A publication Critical patent/GB1223900A/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
    • F16B23/0076—Specially shaped nuts or heads of bolts or screws for rotations by a tool causing slipping of the tool in loosening rotation, i.e. disabling unscrewing unless another tool is used

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

1,223,900. Screwdrivers. G.K.N. SCREWS & FASTENERS Ltd. 31 July, 1969 [31 July, 1968], No. 36471/68. Heading B3N. [Also in Division F2] In a "clutch head" or tamper-proof screw having abutment surfaces 17 which are drivingly engaged by faces 20 or 22 of a screwdriver bit 19 when rotated in one direction and cam surfaces 17a, 17b which lift the screwdriver bit 19 out of driving engagement with the surfaces when rotated in the opposite direction, a slightly tapered recess 14 is provided in the head of the screw to receive an axially projecting pilot 23 on the screwdriver bit 19.
GB3647168A 1968-07-31 1968-07-31 Improvements in or relating to tamperproof screws Expired GB1223900A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3647168A GB1223900A (en) 1968-07-31 1968-07-31 Improvements in or relating to tamperproof screws

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3647168A GB1223900A (en) 1968-07-31 1968-07-31 Improvements in or relating to tamperproof screws

Publications (1)

Publication Number Publication Date
GB1223900A true GB1223900A (en) 1971-03-03

Family

ID=10388456

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3647168A Expired GB1223900A (en) 1968-07-31 1968-07-31 Improvements in or relating to tamperproof screws

Country Status (1)

Country Link
GB (1) GB1223900A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5257168U (en) * 1975-10-24 1977-04-25
JPS52103267U (en) * 1976-02-03 1977-08-05
US4109691A (en) * 1977-12-21 1978-08-29 Wilson Floyd Leroy Combination torque release screw and screw driver
JPS5416063A (en) * 1977-06-09 1979-02-06 Illinois Tool Works Insertable bolt and driving attach ment therefore
EP0013274A1 (en) * 1978-12-22 1980-07-09 Fa Karcher Schraubenwerke GmbH Mechanical connectors and fixing tool therefor
GB2138092A (en) * 1983-04-09 1984-10-17 Ford Motor Co Sealing screw for threaded through bores
US4658918A (en) * 1985-07-25 1987-04-21 Strata Bit Corporation Threaded nozzle for a drill bit
GB2225547A (en) * 1988-11-30 1990-06-06 John Herbert Thomsett Screwdriver and screw
GB2236569A (en) * 1989-10-03 1991-04-10 Norman Cropper A security screw
US5340256A (en) * 1992-08-14 1994-08-23 Kinnings Marlow Limited Security nuts
GB2316989A (en) * 1996-09-10 1998-03-11 Donald John Hart A fastening device for one-way rotation
GB2354566A (en) * 1999-09-22 2001-03-28 Connor Edward O Screwdriver with locating peg
GB2524520A (en) * 2014-03-25 2015-09-30 Lillemor Ltd Fasteners

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5257168U (en) * 1975-10-24 1977-04-25
JPS52103267U (en) * 1976-02-03 1977-08-05
JPS6237244B2 (en) * 1977-06-09 1987-08-11 Illinois Tool Works
JPS5416063A (en) * 1977-06-09 1979-02-06 Illinois Tool Works Insertable bolt and driving attach ment therefore
JPS5510199A (en) * 1977-06-09 1980-01-24 Illinois Tool Works Clamping instrument with propelling and fixing device * and tool for the clamping instrument
JPS5527830B2 (en) * 1977-06-09 1980-07-23
US4109691A (en) * 1977-12-21 1978-08-29 Wilson Floyd Leroy Combination torque release screw and screw driver
EP0013274A1 (en) * 1978-12-22 1980-07-09 Fa Karcher Schraubenwerke GmbH Mechanical connectors and fixing tool therefor
GB2138092A (en) * 1983-04-09 1984-10-17 Ford Motor Co Sealing screw for threaded through bores
US4658918A (en) * 1985-07-25 1987-04-21 Strata Bit Corporation Threaded nozzle for a drill bit
GB2225547A (en) * 1988-11-30 1990-06-06 John Herbert Thomsett Screwdriver and screw
GB2236569A (en) * 1989-10-03 1991-04-10 Norman Cropper A security screw
GB2236569B (en) * 1989-10-03 1993-11-17 Norman Cropper A security screw
US5340256A (en) * 1992-08-14 1994-08-23 Kinnings Marlow Limited Security nuts
GB2316989A (en) * 1996-09-10 1998-03-11 Donald John Hart A fastening device for one-way rotation
GB2354566A (en) * 1999-09-22 2001-03-28 Connor Edward O Screwdriver with locating peg
GB2524520A (en) * 2014-03-25 2015-09-30 Lillemor Ltd Fasteners

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