GB2210428A - The self-countersingking screw - Google Patents
The self-countersingking screw Download PDFInfo
- Publication number
- GB2210428A GB2210428A GB8722881A GB8722881A GB2210428A GB 2210428 A GB2210428 A GB 2210428A GB 8722881 A GB8722881 A GB 8722881A GB 8722881 A GB8722881 A GB 8722881A GB 2210428 A GB2210428 A GB 2210428A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screw
- fixing means
- head
- cutting edge
- countersink
- 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- Withdrawn
Links
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- -1 blockboard Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011093 chipboard Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
- F16B35/065—Specially-shaped heads with self-countersink-cutting means
Abstract
A screw or similar threaded fixing means has a head which incorporates means by which a countersink is bored in the substrate as the screw is driven home, eliminating the need for a separate countersinking tool and operation. To facilitate the escape of particles a cutting edge may coincide with the slot in the screw head or a constriction provided in the shaft. The cutting edge or edges may be angled towards or backwards, spiral or sub-divided; an abrasive surface may be provided instead. <IMAGE>
Description
The Self Countersinking Screw.
This invention relates to a fixing means for use primarily, but not exclusively, with wood, plastics, metals and other materials such as blockboard, chipboard, hardboard, plasterboard, laminates and composites or for fastening any of the former to plaster, cement, bricks, or stone.
Screws of various descriptions are known and used for a wide variety of purposes which generally involve holding at least two pieces of like or different substance together. It is often desirable that the head of the screw should be either flush with the surface of the material or should lie below the surface so that a suitable filler or capping piece can be used to disguise and protect the screw head. To achieve this end the well known technique of countersinking is employed. Many devices are known for boring the countersink. These include a variety of drill bits and hand held implements. They are all either very specialised or involve a separate work operation to form the countersink.
My invention is screw or similar threaded fixing means characterized in that the head incorporates means whereby a countersink is bored in the substrate as the screw or fixing means is driven home. Screws or fixing means according to the invention have the advantages that they are cheap to manufacture and their use eliminates the need for a separate countersinking tool and operation. The invention has the further advantage that the screws or fixing means according to the invention bore a countersink which is matched to the shape of the underside of the screw head.
By way of example only; the boring means may be formed on a standard mild steel screw by cutting or scoring the underside of the head along a line which runs substantially radially out from the shaft of the screw to the outer perimeter of the head. The plane of the cut or score is such that a small lip can be raised from the undersurface of the screw so as to form a cutting edge which will bite when the screw is driven home.
The cutting edge so described can be formed according to known methods.
Figure 1 is a three dimensional representation of a screw according to my invention. The screw illustrated has a conventional slotted head but my invention is equally applicable to other countersunk screws or fixing devices such as the well known posidrive screw. Figure 2 is a cross section through the head of the screw in a plain at a right angle to the long axis of the screw.
Where a conventional screw is used it is especially advantageous to orientate the cutting edge so that its outer end coincides with the slot on the screw head. This facilitates the escape of particles produced as the head bores the countersink.
Alternatively a slight constriction in the shaft immediately under the head of the screw or fixing means may be provided to accommodate the said particles.
Within the scope of my invention there are numerous other ways in which the underside of the screw head can be provided with a means which enables it to bore its own countersJnk. These include differently positioned cutting edges or the provision of a course abrasive surface. For instance the cutting edge may be angled forwards or backwards or- may be spiral or sub-divided.
Claims (9)
1. A screw or similar threaded fixing means characterIzed in that the head incorporates means whereby a countersink is bored in the substrate as the screw or fixing means is driven home.
2. A screw or similar threaded fixing means according to claim 1 wherein the said means for boring a countersink comprises at least one cutting edge running out from the shaft of the screw or fixing means across the underside of the head towards its outer edge.
3. A screw or fixing means according to claim 2 wherein the outer end or ends of the said cutting edge or edges coincide with a slot or slots In the outer edge of the head through which the escape of waste particles is facilitated.
4. A screw or fixing means according to claim 1 or 2 in which the shaft immediately below the head is narrowed so as to accommodate the waste particles produced during the boring operation.
5. A conventional slotted countersunk screw characterized in that the head incorporates means whereby a countersink is bored in the substrate as the screw is driven home and wherein the said means for boring a countersink comprises at least one cutting edge running out from the shaft of the screw across the underside of the head towards its outer edge and wherein the outer end or ends of the said cutting edge or edges coincide with the end or ends of the slot In the screw head such that the escape of waste particles is facilitated.
6. A process for fixing two or more pieces of material together or for fastening one to another using a fixing means according to any of the claims 1 to 5.
7. An article produced according to a process claimed In claim 6 hereof.
8. A screw or fixing means substantially as described herein.
9. A screw or fixing means substantially as described and illustrated herein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8722881A GB2210428A (en) | 1987-11-05 | 1987-11-05 | The self-countersingking screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8722881A GB2210428A (en) | 1987-11-05 | 1987-11-05 | The self-countersingking screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8722881D0 GB8722881D0 (en) | 1987-11-05 |
| GB2210428A true GB2210428A (en) | 1989-06-07 |
Family
ID=10624543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8722881A Withdrawn GB2210428A (en) | 1987-11-05 | 1987-11-05 | The self-countersingking screw |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2210428A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2227540A (en) * | 1989-01-27 | 1990-08-01 | David Ian Quarmby | Self-countersinking screws |
| DE9419375U1 (en) * | 1994-12-05 | 1995-03-16 | Kieslich Kurt | Screw with screw head, in particular countersunk screw |
| GB2314133A (en) * | 1996-06-13 | 1997-12-17 | Chao Hsin Yu | Self-countersinking screw |
| GB2358688A (en) * | 2000-01-26 | 2001-08-01 | Martin James Killeavy | Self countersinking woodscrew |
| AU2009230753B1 (en) * | 2009-09-30 | 2010-04-22 | Craig Stanley Harvey | Self-countersinking fastener |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB602614A (en) * | 1945-08-10 | 1948-05-31 | Mark Bryan | Improvements in or relating to screws |
| GB972653A (en) * | 1960-05-31 | 1964-10-14 | Maxwell Seely Woosnam | Improvements in or relating to fixing screws |
| GB1120844A (en) * | 1965-07-22 | 1968-07-24 | James Henry Thomas Harrington | Improvements in screws |
| US3903784A (en) * | 1972-01-03 | 1975-09-09 | Anchor Bolt And Screw Company | Self-countersinking fastener head |
-
1987
- 1987-11-05 GB GB8722881A patent/GB2210428A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB602614A (en) * | 1945-08-10 | 1948-05-31 | Mark Bryan | Improvements in or relating to screws |
| GB972653A (en) * | 1960-05-31 | 1964-10-14 | Maxwell Seely Woosnam | Improvements in or relating to fixing screws |
| GB1120844A (en) * | 1965-07-22 | 1968-07-24 | James Henry Thomas Harrington | Improvements in screws |
| US3903784A (en) * | 1972-01-03 | 1975-09-09 | Anchor Bolt And Screw Company | Self-countersinking fastener head |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2227540A (en) * | 1989-01-27 | 1990-08-01 | David Ian Quarmby | Self-countersinking screws |
| DE9419375U1 (en) * | 1994-12-05 | 1995-03-16 | Kieslich Kurt | Screw with screw head, in particular countersunk screw |
| GB2314133A (en) * | 1996-06-13 | 1997-12-17 | Chao Hsin Yu | Self-countersinking screw |
| GB2314133B (en) * | 1996-06-13 | 1998-03-11 | Chao Hsin Yu | Countersunk screws |
| GB2358688A (en) * | 2000-01-26 | 2001-08-01 | Martin James Killeavy | Self countersinking woodscrew |
| AU2009230753B1 (en) * | 2009-09-30 | 2010-04-22 | Craig Stanley Harvey | Self-countersinking fastener |
| WO2011038447A1 (en) * | 2009-09-30 | 2011-04-07 | Craig Stanley Harvey | Self counter-sinking fastener |
| US8757949B2 (en) | 2009-09-30 | 2014-06-24 | Craig Stanley Harvey | Self counter-sinking fastener |
| AU2009230753C1 (en) * | 2009-09-30 | 2015-11-26 | Craig Stanley Harvey | Self-countersinking fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8722881D0 (en) | 1987-11-05 |
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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) |