GB2037925A - Screwdriver Bits and Screws - Google Patents

Screwdriver Bits and Screws Download PDF

Info

Publication number
GB2037925A
GB2037925A GB7836155A GB7836155A GB2037925A GB 2037925 A GB2037925 A GB 2037925A GB 7836155 A GB7836155 A GB 7836155A GB 7836155 A GB7836155 A GB 7836155A GB 2037925 A GB2037925 A GB 2037925A
Authority
GB
United Kingdom
Prior art keywords
bit
section
slot
tip
cross
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Withdrawn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
GB7836155A
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 GB7836155A priority Critical patent/GB2037925A/en
Publication of GB2037925A publication Critical patent/GB2037925A/en
Withdrawn legal-status Critical Current

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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
    • B25B15/007—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with blade of flat or substantially flat 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
    • F16B23/0015—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

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  • 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 bit 1, which may be attached to a handle 2, has a transverse cross-section which increases towards its tip 6; a screw 3 has a head 4 having a slot 5 whose cross-section increases towards the screw tip. The tip 6 may be outwardly concave at each side. The bit 1 may have an axial key for engagement with the handle 2, or have a squared end for engagement with a chuck of a power drill. <IMAGE>

Description

SPECIFICATION Screwdriver Bits and Screws The present invention relates to screwdriver bits such as are used for hand-held and poweroperated screwdrivers, and to screws which can be used with the bits.
A conventionalscrewdriver bit comprises a shaft with a blade at one end. Usually the transverse cross-section of the blade reduces towards the blade tip, but I have now found that a different shape of blade can be employed to give better engagement between the bit and a screw.
According to my invention I provide a screwdriver bit having a blade whose transverse cross-section increases towards the blade tip.
The blade of such bits may take various forms, but preferably the transverse cross-section of the blade has a waist. The cross-section will then increase from the waist to the tip and will also increase from the waist back towards the shaft of the bit.
The increase in cross-section towards the tip may be constant, and thus giving a flat-sided portion for engagement with the sides of the slot of a slot-headed screw. As an alternative, the decrease can be non-linear in which case the said portion is preferably outwardly concave.
For hand-held screwdrivers it may be desirable to provide an axial key at the other end of the shaft of the bit so that the bit may be adequately secured to a handle. In a similar manner, for a power-operated bit it may be desirable to square off the shaft at the other end for engagement in the chuck of a drill. The screwdriver bits of the present invention may be used satisfactorily with conventional slot-headed screws, but as a corollary to the invention I also provide novel screws. Thus, according to a further aspect of this invention, I provide a slot-headed screw whereof at least part of the slot is of broader cross-section than the mouth of the slot. Preferably the part of broadest cross-section is at the base of the slot, and preferably the cross-section increases in a constant manner from the mouth to the base.The screws of the present invention may be used satisfactorily with conventional screwdrivers. The present invention will be further illustrated by way of example with reference to the accompanying drawings.
The principal view in the drawing shows a screwdriver and a screw which embody the present invention. As can be seen, the driving end of the screwdriver shaft has a waisted blade such that the cross-section increases to the tip. The head of the screw engaged by the screwdriver has an analogously configured slot whose mouth is just broader than the width of the tip of the screwdriver blade. The screw is shown in more detail to the left of the drawing. To the right of the drawing are shown examples of other screwdriver bits which embody the present invention.
Claims
1. A combination of a screwdriver bit and screw, in which the transverse cross-section of the bit increases towards the tip of the bit, and in which there is an increase in the cross-section of the screw slot towards the screw tip.
2. A combination according to claim 1, in which the increase in cross-section towards the tip of the bit is constant.
3. A combination according to claim 1, in which the increase in cross-section towards the tip of the bit is non-linear.
4. A combination according to claim 4, in which the cross-section of the bit is outwardly concave.
5. A combination according to any one of the preceding claims, in which bit has an axial key at its end distal from the tip, for engagement with a handle.
6. A combination according to any one of claims 1 to 4, in which the bit has a squared end distal from the tip, for engagement with a chuck.
7. A combination according to any one of the preceding claims, in which the part of the slot of broadest cross-section is at the base of the slot.
8. A combination according to any one of the preceding claims, in which the cross-section of the slot increases in constant manner to the base of the slot.
9. A combination according to any one of the preceding claims, in which the narrowest part of the slot is just broader than the width of the tip of the bit.
10. A combination substantially as herein described with reference to the accompanying drawings.
11. A screwdriver bit as defined in any one of the preceding claims.
12. A screw as defined in any one of claims 1 to 10.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Screwdriver Bits and Screws The present invention relates to screwdriver bits such as are used for hand-held and poweroperated screwdrivers, and to screws which can be used with the bits. A conventionalscrewdriver bit comprises a shaft with a blade at one end. Usually the transverse cross-section of the blade reduces towards the blade tip, but I have now found that a different shape of blade can be employed to give better engagement between the bit and a screw. According to my invention I provide a screwdriver bit having a blade whose transverse cross-section increases towards the blade tip. The blade of such bits may take various forms, but preferably the transverse cross-section of the blade has a waist. The cross-section will then increase from the waist to the tip and will also increase from the waist back towards the shaft of the bit. The increase in cross-section towards the tip may be constant, and thus giving a flat-sided portion for engagement with the sides of the slot of a slot-headed screw. As an alternative, the decrease can be non-linear in which case the said portion is preferably outwardly concave. For hand-held screwdrivers it may be desirable to provide an axial key at the other end of the shaft of the bit so that the bit may be adequately secured to a handle. In a similar manner, for a power-operated bit it may be desirable to square off the shaft at the other end for engagement in the chuck of a drill. The screwdriver bits of the present invention may be used satisfactorily with conventional slot-headed screws, but as a corollary to the invention I also provide novel screws. Thus, according to a further aspect of this invention, I provide a slot-headed screw whereof at least part of the slot is of broader cross-section than the mouth of the slot. Preferably the part of broadest cross-section is at the base of the slot, and preferably the cross-section increases in a constant manner from the mouth to the base.The screws of the present invention may be used satisfactorily with conventional screwdrivers. The present invention will be further illustrated by way of example with reference to the accompanying drawings. The principal view in the drawing shows a screwdriver and a screw which embody the present invention. As can be seen, the driving end of the screwdriver shaft has a waisted blade such that the cross-section increases to the tip. The head of the screw engaged by the screwdriver has an analogously configured slot whose mouth is just broader than the width of the tip of the screwdriver blade. The screw is shown in more detail to the left of the drawing. To the right of the drawing are shown examples of other screwdriver bits which embody the present invention. Claims
1. A combination of a screwdriver bit and screw, in which the transverse cross-section of the bit increases towards the tip of the bit, and in which there is an increase in the cross-section of the screw slot towards the screw tip.
2. A combination according to claim 1, in which the increase in cross-section towards the tip of the bit is constant.
3. A combination according to claim 1, in which the increase in cross-section towards the tip of the bit is non-linear.
4. A combination according to claim 4, in which the cross-section of the bit is outwardly concave.
5. A combination according to any one of the preceding claims, in which bit has an axial key at its end distal from the tip, for engagement with a handle.
6. A combination according to any one of claims 1 to 4, in which the bit has a squared end distal from the tip, for engagement with a chuck.
7. A combination according to any one of the preceding claims, in which the part of the slot of broadest cross-section is at the base of the slot.
8. A combination according to any one of the preceding claims, in which the cross-section of the slot increases in constant manner to the base of the slot.
9. A combination according to any one of the preceding claims, in which the narrowest part of the slot is just broader than the width of the tip of the bit.
10. A combination substantially as herein described with reference to the accompanying drawings.
11. A screwdriver bit as defined in any one of the preceding claims.
12. A screw as defined in any one of claims 1 to 10.
GB7836155A 1978-09-08 1978-09-08 Screwdriver Bits and Screws Withdrawn GB2037925A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7836155A GB2037925A (en) 1978-09-08 1978-09-08 Screwdriver Bits and Screws

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7836155A GB2037925A (en) 1978-09-08 1978-09-08 Screwdriver Bits and Screws

Publications (1)

Publication Number Publication Date
GB2037925A true GB2037925A (en) 1980-07-16

Family

ID=10499546

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7836155A Withdrawn GB2037925A (en) 1978-09-08 1978-09-08 Screwdriver Bits and Screws

Country Status (1)

Country Link
GB (1) GB2037925A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0136854A1 (en) * 1983-09-21 1985-04-10 Justin Richard Whittaker Screwdriver with shaped blade tip
US4538486A (en) * 1982-11-22 1985-09-03 Jacques Lutrat Non-slip screw
GB2188389A (en) * 1985-11-30 1987-09-30 Clive Alan Newbould Screw driving formations
GB2444066A (en) * 2006-11-21 2008-05-28 Daniel Haines Fastener and driver system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538486A (en) * 1982-11-22 1985-09-03 Jacques Lutrat Non-slip screw
EP0136854A1 (en) * 1983-09-21 1985-04-10 Justin Richard Whittaker Screwdriver with shaped blade tip
GB2188389A (en) * 1985-11-30 1987-09-30 Clive Alan Newbould Screw driving formations
GB2444066A (en) * 2006-11-21 2008-05-28 Daniel Haines Fastener and driver system
GB2444066B (en) * 2006-11-21 2009-04-01 Daniel Haines Fastener system

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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)