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GB2225547A - Screwdriver and screw - Google Patents

Screwdriver and screw Download PDF

Info

Publication number
GB2225547A
GB2225547A GB8827888A GB8827888A GB2225547A GB 2225547 A GB2225547 A GB 2225547A GB 8827888 A GB8827888 A GB 8827888A GB 8827888 A GB8827888 A GB 8827888A GB 2225547 A GB2225547 A GB 2225547A
Authority
GB
United Kingdom
Prior art keywords
screwdriver
slot
screw
recess
blade
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Withdrawn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
GB8827888A
Other versions
GB8827888D0 (en
Inventor
John Herbert Thomsett
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
Priority to GB8827888A priority Critical patent/GB2225547A/en
Publication of GB8827888D0 publication Critical patent/GB8827888D0/en
Publication of GB2225547A publication Critical patent/GB2225547A/en
Withdrawn legal-status Critical Current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
    • 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
    • B25B15/007—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with blade of flat or substantially flat cross-section

Landscapes

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

Abstract

A screwdriver slot 1 is provided with a recess 2 to prevent a screwdriver blade 6 sliding along the slot. A screwdriver blade 6 is made to fit the recessed screwdriver slot. This arrangement enables torque to be applied to the screwhead without slippage between the screw and screwdriver blade. <IMAGE>

Description

AN IMPROVED SCREWDRIVER SLOT This invention relates to a means of positively locating a screwdriver blade in a screwdriver slot by mechanically preventing the blade sliding along the slot.
Users of screwdrivers in slotted screw heads often experience the tendency of the blade to slide along the slot under torque loading leading to a loss of torque or complete disengagement. This is particularly marked in motorpowered screwdriving. Attempts to overcome this difficulty by using a complex geometric recess in the screw head often lead to a loss of tensile strength in the screw material.
According to the present invention the screwdriver slot is provided with a recess co-axial with the axis of rotation of the screw. The recess cross section may be of any geometric shape. The recess mean diameter can vary from smaller than, to larger than, the slot width.
The recess depth from the top face of the screw can vary from, less than, to greater than, the depth of the slot. The tip of the screwdriver blade is formed to fit into the periphery of the recessed screwdriver slot in a snug fit and may be formed by any convenient means, including fabrication.
A specific embodiment of the invention will now be described by way of an example with reference to the accompanying drawing. The screw shown has a normal screwdriver slot 1 with a recess 2 on the axis of screw rotation 3. The diameter of the recess is twice the width of the slot and the depth of the recess is equal to the depth of the slot. The screwdriver blade 6 is cut from solid in the manner shown so that the end of the blade between dotted line 4 and face 5 fits into slot 1 and recess 2 snugly.

Claims (2)

1 A screwdriver slot with a locating recess as described in this invention.
2 A screwdriver blade to fit the recessed screwdriver slot as claimed in claim 1.
GB8827888A 1988-11-30 1988-11-30 Screwdriver and screw Withdrawn GB2225547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8827888A GB2225547A (en) 1988-11-30 1988-11-30 Screwdriver and screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8827888A GB2225547A (en) 1988-11-30 1988-11-30 Screwdriver and screw

Publications (2)

Publication Number Publication Date
GB8827888D0 GB8827888D0 (en) 1989-01-05
GB2225547A true GB2225547A (en) 1990-06-06

Family

ID=10647678

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8827888A Withdrawn GB2225547A (en) 1988-11-30 1988-11-30 Screwdriver and screw

Country Status (1)

Country Link
GB (1) GB2225547A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2421922A (en) * 2005-01-10 2006-07-12 Paul Cornwall Non slip screwdriver and corresponding screw
USD739220S1 (en) * 2014-09-30 2015-09-22 Lee Valley Tools Ltd. Wall fastener
US9265600B2 (en) 2013-02-27 2016-02-23 Orthopediatrics Corp. Graft fixation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB805275A (en) * 1956-06-08 1958-12-03 Douglas Ferdinand Theodore Des A device for preventing a screw driver slipping in the slot of a screw
GB955044A (en) * 1961-03-31 1964-04-08 Pierre Launay Improvements in screws and screwdrivers
GB1223900A (en) * 1968-07-31 1971-03-03 Gkn Screws Fasteners Ltd Improvements in or relating to tamperproof screws
US3695321A (en) * 1970-06-30 1972-10-03 Jacob W Garehime Jr Cavity head screw and driving tool therefor
GB1392360A (en) * 1972-06-27 1975-04-30 Barlow J W Screw and screw driver
GB1455003A (en) * 1973-03-15 1976-11-10 Iskra M Screwdrivers and screws for use therewith

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB805275A (en) * 1956-06-08 1958-12-03 Douglas Ferdinand Theodore Des A device for preventing a screw driver slipping in the slot of a screw
GB955044A (en) * 1961-03-31 1964-04-08 Pierre Launay Improvements in screws and screwdrivers
GB1223900A (en) * 1968-07-31 1971-03-03 Gkn Screws Fasteners Ltd Improvements in or relating to tamperproof screws
US3695321A (en) * 1970-06-30 1972-10-03 Jacob W Garehime Jr Cavity head screw and driving tool therefor
GB1392360A (en) * 1972-06-27 1975-04-30 Barlow J W Screw and screw driver
GB1455003A (en) * 1973-03-15 1976-11-10 Iskra M Screwdrivers and screws for use therewith

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2421922A (en) * 2005-01-10 2006-07-12 Paul Cornwall Non slip screwdriver and corresponding screw
US9265600B2 (en) 2013-02-27 2016-02-23 Orthopediatrics Corp. Graft fixation
USD739220S1 (en) * 2014-09-30 2015-09-22 Lee Valley Tools Ltd. Wall fastener

Also Published As

Publication number Publication date
GB8827888D0 (en) 1989-01-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)