GB2418879A - Improvements in or relating to combination tool heads - Google Patents

Improvements in or relating to combination tool heads Download PDF

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Publication number
GB2418879A
GB2418879A GB0422206A GB0422206A GB2418879A GB 2418879 A GB2418879 A GB 2418879A GB 0422206 A GB0422206 A GB 0422206A GB 0422206 A GB0422206 A GB 0422206A GB 2418879 A GB2418879 A GB 2418879A
Authority
GB
United Kingdom
Prior art keywords
tool head
combination tool
section
head according
longitudinal axis
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Withdrawn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
GB0422206A
Other versions
GB0422206D0 (en
Inventor
Julia Jones
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 GB0422206A priority Critical patent/GB2418879A/en
Publication of GB0422206D0 publication Critical patent/GB0422206D0/en
Publication of GB2418879A publication Critical patent/GB2418879A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/08—Drills combined with tool parts or tools for performing additional working
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/10—Bits for countersinking
    • 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
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F1/00—Combination or multi-purpose hand tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/66—Drills with provision to be used as a screwdriver

Abstract

The invention concerns a combination tool head 3 comprising a plurality of radial webs 6 that taper towards a distal end of the tool head 3 to form a plurality of discrete pointed ends 7. Each web 6 has a first section 6' nearer the distal end than a second section 6'' with an outer radial edge 6b' of the first section 6' being at a smaller angle relative to a longitudinal axis of the tool head than an outer radial edge 6b'' of the second section 6''. The webs 6 provide cutting surfaces for drilling a hole in a workpiece and a drive formation engageable with a mating formation in the head of a screw for driving screws into and removing screws from a workpiece. The hole formed when drilling has a lower region formed by the first section 6' of the webs that provides a pilot hole for a screw and an upper region formed by the second section 6'' that provides a countersink for the head of the screw.

Description

24 1 8879
IMPROVEMENTS IN OR RELATING TO
COMBINATION TOOL HEADS
This invention concerns improvements in or relating to combination tool heads for drilling holes in a workpiece and for driving screws into and removing screws from a workpiece.
Combination tool heads for drilling holes in a workpiece and for driving screws into and removing screws from a workpiece are known and the present invention seeks to provide an improved combination tool head for this purpose.
According to a first aspect of the invention there is provided a combination tool head comprising a plurality of radial webs that taper towards a distal end of the tool head to form a plurality of discrete pointed ends, wherein each web has a first section nearer the distal end than a second section, an outer radial edge of the first section being at a smaller angle relative to a longitudinal axis ol the tool head than an outer radial edge of the second section.
The invented tool head can be used for drilling a hole in a workpiece and for driving a screw into a workpiece. More specifically, the webs provide cutting surfaces for drilling a hole in a workpiece and a drive formation engageable with a mating formation in the head of a screw for driving the screw into a workpiece.
The tool head may have four webs for engagement with a cross-headed slot in a screw head. Alternatively, the tool head may have two webs for engagement with a diametric slot in a screw head.
Preferably the discrete pointed ends at the distal ends of the webs are offset from the longitudinal axis of and are circumferentially spaced apart around the longitudinal axis of the tool head. The pointed ends serve to locate the tool head and prevent the tool head slipping when drilling a hole in a workpiece.
The hole formed when drilling has a lower region formed by the first section of the webs that provides a pilot hole for a screw and an upper region formed by the second section that provides a countersink for the head of the screw. The first section may extend at an angle in the range 10 to 50 , more preferably 20 to 40 , most preferably approximately 30 . The second section may extend at angle in the range 40 to 80 , more preferably 50 to 70 and most preferably 60 .
The outer radial edges of the first and second sections may be of any suitable shape for example straight or curved and are preferably provided with a sharp edge for cutting when drilling. Each web may have a stepped section between the first and second sections that extends parallel to the longitudinal axis.
Preferably, each web has a third section further from the distal end than the second section that extends parallel to the longitudinal axis of the tool head. The third section forms a counter bore when drilling for recessing the head of a screw below the surface of a workplace and/or for inserting a plug to conceal the screw head.
Advantageously, the valleys formed between the webs are shaped to guide shavings and/or swarf formed when drilling a hole in a workpiece away from the distal end and eject the shavings/swarf out of the hole at the rear end of the valleys. For example, the valleys may have a surface that is r curved in the direction of rotation to direct the shavings away from the distal end as the tool head rotates.
Preferably, the valleys extend into the third section to allow shavings/swarf to be ejected when drilling a counterbore in a workpiece.
The tool head preferably forms part of a tool bit for detachable mounting in a chuck of a drill or holder of an adaptable screwdriver. For example the tool bit may have a shank of hexagonal cross-section. Alternatively, the tool head may be an integral part of a drill or screwdriver.
According to a second aspect of the invention there is provided a combination tool head comprising a plurality of radial webs forming a plurality of discrete pointed ends at a distal end of the tool head, an outer radial edge of each web having a first region extending from the distal end at an angle to the longitudinal axis of the tool head and a second region extending from the first region parallel to the longitudinal axis.
Preferably, the outer radial edges of the webs in the first region form cutting surfaces for drilling a hole in a workplace and the second region forms a counterbore at the outer end of the hole for locating the screw head below the surface of the workpiece.
The first region may extend at a uniform (constant) angle to the longitudinal axis. More preferably, the first region has a leading part and a trailing part that extend at different angles to the longitudinal axis.
Preferably, the leading part extends at a smaller angle.
According to a third aspect of the invention there is provided a combination tool head comprising a plurality of radial webs with valleys between the webs, each web forming a discrete pointed end at a distal end of the tool head and providing a cutting surface for drilling a hole in a workpiece, wherein each valley is shaped such that shavings/swarf formed when drilling a hole are ejected rearwardly.
Preferably, each valley has a surface that is curved in the direction of rotation between two adjacent webs and propels the shavings/swarf rearwardly away from the distal end as the tool head rotates. In a preferred arrangement, the curved surface is provided at a rear end of the valley.
Preferably, each valley extends rearwardly away from the distal end and terminates in a section of the tool head shaped to form a counterbore in a workplace when drilling so that shavings/swarf can be ejected from the hole while drilling without removing the tool head from the hole.
According to a fourth aspect of the invention, there is provided a combination tool head comprising a plurality of radial webs that taper towards a distal end of the tool head, each web providing a drive formation engageable with a mating formation of a screw head for driving a screw into a workplace and a cutting surface for drilling a hole in a workpiece, each web having a first section to form a pilot hole for a screw, a second section to form a countersink for a screw head and a third section to form a counterbore for a screw head.
The invention will now be described in more detail, by way of example only, with reference to the accompanying drawings, in which: Figure I is a perspective view of a tool bit with a tool head according to the invention; Figure 2 is a side view of the tool bit shown in Figure 1; and Figure 3 is an end view of the tool bit in the direction of arrow A in Figure 1.
Referring to the drawings there is shown a too] bit I having a cylindrical body 2 with a tool head 3 at one end and a shank 4 of hexagonal crosssection at the other end. A radial shoulder 5 separates the shank 4 from the body 2 and provides a stop to limit insertion of the shank 4 in a chuck of a drill or tool holder of a screwdriver.
The tool head 3 has four radial webs 6 uniformly spaced apart to provide a drive formation engageable with a mating formation in a head of a screw (not shown) for driving the screw into a workpiece (not shown) and for removing the screw from the workplace by reversing the direction of rotation of the tool head 3.
In this embodiment, the webs 6 are suitable for use with screws of size 6 to 10. It will be understood, however that this is not essential and the webs could be designed for use with smaller or larger screws.
Each radial web 6 tapers towards a distal end of the tool head 3 and terminates in a discrete pointed end 7. The pointed ends 7 are offset from a central longitudinal axis of the tool head 3 and are uniformly spaced apart.
Each web 6 has an inner edge 6a and an outer edge 6b that extend rearwardly from the pointed end 7. The inner edges 6a of the webs 6 join at the centre of the tool head 3 to form a recess 8 of V-shaped section.
The outer edges 6b of the webs 6 join the body 2. r
Each web 6 has a first section 6', a second section 6" and a third section 6"'. The outer edges fib', 6b" of the first and second sections 6', 6" extend at an angle to the longitudinal axis of the tool head and the outer edge 6b"' of the third section 6"' extends parallel to the longitudinal axis of the tool head 3.
In this embodiment, a short step fib"" is provided in the outer edge between the outer edges fib', 6b" of the first and second sections that extends parallel to the longitudinal axis of the tool head 3. This is not lO essential however, and the step 6b"" may be omitted.
As shown, the outer edge 6b' of the first section 6' extends at a smaller angle to the longitudinal axis than the outer edge 6b" of the second section 6". For example, the outer edge 6b' extends at approximately 30 to the longitudinal axis and the outer edge 6b" extends at approximately 60 to the longitudinal axis. These angles are not intended to be limiting and the outer edges 6b', 6b" may extend at other angles.
The outer edges 6b are provided with bevelled or angled faces to provide a cutting surface when the tool head 3 is rotated about the longitudinal axis. The first section 6' of the tool head forms a pilot hole to assist in locating a screw and the second section 6" forms a countersink to receive the screw head whereby the screw head may be located flush with the outer surface of the workpiece.
The cutting surface of the second section 6" forms a hole having a maximum diameter equal to the diameter of the third section 6"' which forms a counterbore when it is desired to recess the screw head below the outer surface of the workpiece and conceal the screw head with a blanking plug inserted into the counterbore.
The tool head 3 further comprises valleys 11 between the webs 6 that extend from the distal end to the body 2. As shown, each valley 11 has a curved surface 11a at the rear end that extends from the end of the second section 6" of the web 6 on one side of the valley l l to the end of the third section 6"' of the web 6 on the other side of the valley I 1.
The curvature of the surface lla relative to the direction of rotation of the tool head 3 is such that shavings/swarf produced when drilling a hole are ejected rearwardly out of the hole as it is formed and do not inhibit drilling of the hole. The valleys 11 extend into the third section 6"' so that shavings/swarf can be ejected without removing the tool head from the hole when drilling a counterbore.
As will be appreciated, by employing different taper angles for the first and second sections 6', 6", the distance between the pointed ends 7 of the webs and the third section 6"' is reduced. In this way, the tool head 3 can be used to provide a counterbore in workplaces of smaller thickness than would be possible if the first and second sections 6', 6" extended at a uniform angle.
It will be understood the invention is not limited to the embodiment above-described. For example, the size of the pilot hole, countersink and counterbore may be varied as desired to suit different screw sizes.

Claims (33)

T CLAIMS
1. A combination tool head comprising a plurality of radial webs that taper towards a distal end of the tool head to form a plurality of discrete pointed ends, wherein each web has a first section nearer the distal end than a second section, an outer radial edge of the first section being at a smaller angle relative to a longitudinal axis of the tool head than an outer radial edge of the second section.
2. A combination tool head according to claim 1, wherein the tool head comprises four webs for engagement with a cross-headed slot in a screw head.
3. A combination tool head according to claim 1, wherein the tool head comprises two webs for engagement with a diametric slot in a screw head.
4. A combination tool head according to any one of the preceding claims, wherein the discrete pointed ends at the distal ends of the webs are offset from the longitudinal axis of and circumferentially spaced apart around the longitudinal axis of the tool head.
5. A combination tool head according to any one of the preceding claims, wherein the first section extends at an angle to the longitudinal axis in the range of 10 to 50 .
6. A combination tool head according to claim 5, wherein the first section extends at an angle to the longitudinal axis in the range of 20 to 4oo.
7. A combination tool head according to claim 6, wherein the first section extends at an angle to the longitudinal axis of approximately 30 .
8. A combination tool head according to any one of the preceding claims, wherein the second section extends at an angle to the longitudinal axis in the range 40 to 80 .
9. A combination tool head according to claim 8, wherein the second section extends at an angle to the longitudinal axis in the range 50 to 70 .
10. A combination tool head according to claim 9, wherein the second section extends at an angle to the longitudinal axis of 60 .
11. A combination tool head according to any one of the preceding claims, wherein the outer radial edges of the first and second sections are straight.
12. A combination tool head according to any one of claims 1 to 10, wherein the outer radial edges of the first and second sections are curved.
13. A combination tool head according to any one of the preceding claims, wherein the outer radial edges of the first and second sections are provided with a sharp edge.
14. A combination tool head according to any one of the preceding claims, wherein each web has a stepped section between the first and second sections that extends parallel to the longitudinal axis.
15. A combination tool head according to any one of the preceding claims, wherein each web has a third section further from the distal end than the second section that extends parallel to the longitudinal axis of the tool head.
16. A combination tool head according to any one of the preceding claims, wherein valleys formed between the webs are shaped to guide shavings and/or swarf formed when drilling a hole in a workplace away from the distal end and eject the shavings/swarf out of the hole at a rear end of the valleys.
17. A combination tool head according to claim 16, wherein each valley has a surface that is curved in the direction of rotation to direct shavings away from the distal end as the tool head rotates.
18. A combination tool head according to claim 17 wherein the curved surface is provided at a rear end of the valley.
19. A combination tool head according to any one of claims 16 to 18 as dependent on claim 15, wherein the valleys extend into the third section.
20. A combination tool head according to any one of claims 1 to 18, wherein the tool head is an integral part of a drill or screwdriver.
21. A combination tool head comprising a plurality of radial webs forming a plurality of discrete pointed ends at a distal end of the tool head, an outer radial edge of each web having a first region extending from the distal end at an angle to the longitudinal axis of the tool head and a second region extending from the first region parallel to the longitudinal axis.
22. A combination tool head according to claim 21, wherein the outer radial edges of the webs in the first region form cutting surfaces for drilling a hole in a workplace and the second region is for forming a counterbore at the outer end of the hole for locating the screw head below the surface of the workpiece.
23. A combination tool head according to claim 21 or claim 22, wherein the first region extends at a uniform angle to the longitudinal axis.
24. A combination tool head according to claims 21 or claim 22, wherein the first region has a leading part and a trailing part that extend at different angles to the longitudinal axis.
25. A combination tool head according to claim 24, wherein the leading part extends of a smaller angle to the longitudinal axis than the trailing part.
26. A combination tool head comprising a plurality of radial webs with valleys between the webs, each web forming a discrete pointed end at a distal end of the tool head and providing a cutting surface for drilling a hole in a workpiece, wherein each valley is shaped such that shavings and/or swarf formed when drilling a hole are ejected rearwardly.
27. A combination tool head according to claim 26, wherein each valley has a surface that is curved in the direction of rotation between two adjacent webs and propels the shavings/swarf rearwardly away from the distal end as the tool head rotates.
28. A combination tool head according to claim 27, wherein the curved surface is provided at a rear end of the valley. l
29. A combination tool head according to any one of claims 26 to 28, wherein each valley extends rearwardly away from the distal end and terminates in a section of the tool head shaped to form a counterbore in a
30. A combination tool head comprising a plurality of radial webs that taper towards a distal end of the tool head, each web providing a drive formation engageable with a mating formation of a screw head for driving a screw into a workplace and a cutting surface for drilling a hole in a workpiece, each web having a first section to form a pilot hole for a screw, a second section to form a countersink for a screw head and a third section to form a counterbore for a screw head.
31. A combination tool head substantially as hereinbefore described with reference to the accompanying drawings.
32. A tool bit provided with a combination tool head according to any one of the preceding claims.
33. A screwdriver provided with a combination tool head according to any one of the preceding claims.
GB0422206A 2004-10-07 2004-10-07 Improvements in or relating to combination tool heads Withdrawn GB2418879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0422206A GB2418879A (en) 2004-10-07 2004-10-07 Improvements in or relating to combination tool heads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0422206A GB2418879A (en) 2004-10-07 2004-10-07 Improvements in or relating to combination tool heads

Publications (2)

Publication Number Publication Date
GB0422206D0 GB0422206D0 (en) 2004-11-03
GB2418879A true GB2418879A (en) 2006-04-12

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Family Applications (1)

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GB0422206A Withdrawn GB2418879A (en) 2004-10-07 2004-10-07 Improvements in or relating to combination tool heads

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2493528A (en) * 2011-08-09 2013-02-13 Julia Rosamunde Jones Tool head with enhanced engagement for removing damaged screws
CN104551188A (en) * 2015-01-12 2015-04-29 中山火炬开发区园丰刀具厂（普通合伙） Molding slotting tool

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4671710A (en) * 1982-10-29 1987-06-09 Nippon Oil & Fats Co., Ltd. Drill bit
US4796319A (en) * 1987-06-11 1989-01-10 David Taft Combination screw-tapping and screwdriving tool
WO1999017908A1 (en) * 1997-10-07 1999-04-15 Fcd (Holdings) Pty. Limited A tool and countersinking screw
GB2350075A (en) * 1999-05-18 2000-11-22 Keith Martyn Jones Combination drill and screwdriver tool
WO2001039915A1 (en) * 1999-11-29 2001-06-07 Fcd Holdings Pty Limited A screwdriving and countersinking bit
US20050105983A1 (en) * 2003-11-14 2005-05-19 Hernandez Hector R.Jr. Multi-functional bit & connect-disconnect coupling used therewith

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4671710A (en) * 1982-10-29 1987-06-09 Nippon Oil & Fats Co., Ltd. Drill bit
US4796319A (en) * 1987-06-11 1989-01-10 David Taft Combination screw-tapping and screwdriving tool
WO1999017908A1 (en) * 1997-10-07 1999-04-15 Fcd (Holdings) Pty. Limited A tool and countersinking screw
GB2350075A (en) * 1999-05-18 2000-11-22 Keith Martyn Jones Combination drill and screwdriver tool
WO2001039915A1 (en) * 1999-11-29 2001-06-07 Fcd Holdings Pty Limited A screwdriving and countersinking bit
US20050105983A1 (en) * 2003-11-14 2005-05-19 Hernandez Hector R.Jr. Multi-functional bit & connect-disconnect coupling used therewith

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2493528A (en) * 2011-08-09 2013-02-13 Julia Rosamunde Jones Tool head with enhanced engagement for removing damaged screws
GB2493528B (en) * 2011-08-09 2016-12-07 Rosamunde Jones Julia Tool heads
CN104551188A (en) * 2015-01-12 2015-04-29 中山火炬开发区园丰刀具厂（普通合伙） Molding slotting tool

Also Published As

Publication number Publication date
GB0422206D0 (en) 2004-11-03

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