GB2246530A - Countersink collar - Google Patents

Countersink collar Download PDF

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Publication number
GB2246530A
GB2246530A GB9016899A GB9016899A GB2246530A GB 2246530 A GB2246530 A GB 2246530A GB 9016899 A GB9016899 A GB 9016899A GB 9016899 A GB9016899 A GB 9016899A GB 2246530 A GB2246530 A GB 2246530A
Authority
GB
United Kingdom
Prior art keywords
collar
countersink
drill bit
shaft
drill
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Withdrawn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
GB9016899A
Other versions
GB9016899D0 (en
Inventor
Richard Louis Mitchell
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 GB9016899A priority Critical patent/GB2246530A/en
Publication of GB9016899D0 publication Critical patent/GB9016899D0/en
Publication of GB2246530A publication Critical patent/GB2246530A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

The collar is secured to the shaft of a drill bit, so that a cutting edge or teeth on the lower section may take the form of a countersink cutter concentric with the drill bit, allowing the cutting of a countersink hole in the same operation as drilling the main hole. The securement is by a radial screw, or an adjustable strap as shown. Alternatively the collar has a spring clamp effect to grip around drills of different diameter shanks. <IMAGE>

Description

THE COUNTERSINK COLLAR This invention relates to a tool which will produce a countersink or larger clearance hole in the same operation as drilling a main hole.
Ordinary twist drills allow rapid drilling of wood and other materials.
However, if the hole is to take a fixing such as a countersunk woodscrew or a bolt without the head protruding, an appropriately sized and shaped countersink bit must be used in a separate operation to cut the recess for the head.
According to the present invention, there is provided an attachment designed to clamp or otherwise attach to the shaft of the drill bit which will cut the countersink section in the same operation as drilling the main hole.
A specific embodiment of the invention will now be described by way of example, with reference to the accompanying drawing.
Figure 1 shows a countersink collar, with a central hole for the shaft of an appropriate drill bit, and an arrangement of teeth on its lower or leading surface, here disposed at an angle suitable for providing countersink holes for woodscrews.
Figure 2 shows the disposition of a countersink collar on a conventional twist drill, and the means of securing it by a grub-screw.
To use, the countersink collar is attached to a suitably sized drill bit at the appropriate distance from the cutting tip for the job in hand, and drilling proceeds in the normal way, until the teeth in the leading edge of the collar produce a counters hole of the appropriate depth.
The drill bit is then withdrawn to go on to the next hole.
Figure 3 shows an alternative form of countersink collar with an external clamp, suitable for larger drill bits.
Figure 4 shows an alternative form of countersink collar which uses a spring clamp effect, so that it has a self-clamping function on a range of drill bit sizes.
Figure 5 shows an alternative form of countersink collar suitable for softer materials

Claims (5)

CLAIv.
1. A collar of any material which may be attached to a drill bit, so that it may act as a countersink bit concentric with that primary drill bit.
2. A collar as claimed in Claim 1 which by means of an external clamp..
clamping screw or other method, may be fastened to the shaft of a drill bit.
3. A collar as claimed in Claim 1 which by virtue of its construction and or its composition has a self-clamping action on the shaft of a drill bit of the appropriate size or range of drill bits of appropriate sizes.
4. A collar as claimed in claim 1 which may be held in place by the action of an external holder, such as the chuck of the drill or brace which holds the shaft of the primary drill bit.
5. A collar as claimed in claim 1 which uses an abrasive material to act as a cutting edge.
GB9016899A 1990-08-01 1990-08-01 Countersink collar Withdrawn GB2246530A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9016899A GB2246530A (en) 1990-08-01 1990-08-01 Countersink collar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9016899A GB2246530A (en) 1990-08-01 1990-08-01 Countersink collar

Publications (2)

Publication Number Publication Date
GB9016899D0 GB9016899D0 (en) 1990-09-12
GB2246530A true GB2246530A (en) 1992-02-05

Family

ID=10680005

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9016899A Withdrawn GB2246530A (en) 1990-08-01 1990-08-01 Countersink collar

Country Status (1)

Country Link
GB (1) GB2246530A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2393676A (en) * 2002-10-02 2004-04-07 James Philip Turner Bit attachment adapted to create a countersink chamfer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544371A (en) * 1940-10-03 1942-04-10 Arthur Harold Cooke Improvements in or relating to drilling tools
GB570099A (en) * 1943-12-18 1945-06-21 Aubrey Evelyn Taylor A combined twist drill and countersinking or counterboring attachment
GB570098A (en) * 1943-12-13 1945-06-21 John Gascoigne Hopewell Improvements in centre and like drills
GB594312A (en) * 1945-01-17 1947-11-07 Marcus & Co Aktiebolag Improvements in or relating to boring and countersinking tools
GB1498841A (en) * 1976-02-16 1978-01-25 Cave O Counterboring and/or countersinking device
GB1591399A (en) * 1977-01-07 1981-06-24 Halpern W Cutting tool assembly
WO1987000100A1 (en) * 1985-07-01 1987-01-15 Caterpillar Inc. Adjustable length chamfering tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544371A (en) * 1940-10-03 1942-04-10 Arthur Harold Cooke Improvements in or relating to drilling tools
GB570098A (en) * 1943-12-13 1945-06-21 John Gascoigne Hopewell Improvements in centre and like drills
GB570099A (en) * 1943-12-18 1945-06-21 Aubrey Evelyn Taylor A combined twist drill and countersinking or counterboring attachment
GB594312A (en) * 1945-01-17 1947-11-07 Marcus & Co Aktiebolag Improvements in or relating to boring and countersinking tools
GB1498841A (en) * 1976-02-16 1978-01-25 Cave O Counterboring and/or countersinking device
GB1591399A (en) * 1977-01-07 1981-06-24 Halpern W Cutting tool assembly
WO1987000100A1 (en) * 1985-07-01 1987-01-15 Caterpillar Inc. Adjustable length chamfering tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2393676A (en) * 2002-10-02 2004-04-07 James Philip Turner Bit attachment adapted to create a countersink chamfer

Also Published As

Publication number Publication date
GB9016899D0 (en) 1990-09-12

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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)