GB2454464A - Screw having an oval shank - Google Patents
Screw having an oval shank Download PDFInfo
- Publication number
- GB2454464A GB2454464A GB0721722A GB0721722A GB2454464A GB 2454464 A GB2454464 A GB 2454464A GB 0721722 A GB0721722 A GB 0721722A GB 0721722 A GB0721722 A GB 0721722A GB 2454464 A GB2454464 A GB 2454464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oval
- screw
- thread
- lock screw
- shank
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims description 20
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 230000001747 exhibiting effect Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003763 resistance to breakage Effects 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel 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
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
- F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic
-
- 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
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
- F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
-
- 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
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
- F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
- F16B25/0063—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections with a non-threaded portion on the shaft of the screw
-
- 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
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft
-
- 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
- F16B35/041—Specially-shaped shafts
Abstract
A screw has a shank (8) with an oval cross sectional area along its complete length. The shank (8) includes a single spiral oval thread (3) that starts in a pronounced gimlet point (9) at the tip, an unthreaded oval portion of shank (7) and a twin spiral oval high-low thread (5) that finishes under the head (2) and is no more than 10% of the length of the single spiral thread (3).
Description
I
Oval Lock Screw The invention relates to a screw of a kind intended primarily for use with soft and hard wood, low-density fibre board, medium-density fibre board, high-density fibre board and occasionally with plastic, masonry and sheet steel, among other similar modern building materials, which is hereinafter referred to as an oval lock screw.
BACKGROUNTJ OF THE INVENTION
Existing conventional screws generally consists of a head, a round shank with spiral threads defined in the shank starting at the tip of the screw Consideration is given to the design of these screws dependant on the application; considerations such as the pull-out resistance of the screw when fixed into material, its ease of insertion into that material and limiting the damage caused to the fixed material on insertion of the screw, among others. Consideration is not generally given to preventing screws unseating over time as the material they are inserted into flexes in use. Decking and carpet rails are good examples where screws unseat counter-clockwise over time.
DESCRIPTION OF THE INVENTION
To overcome this problem the present invention proposes an oval lock screw characterised in that it has a shank with an oval cross sectional area along its complete length, a spiral oval thread that starts pronounced at the tip, followed with an unthreaded oval portion of shank, a twin spiral oval high-low thread that finishes under the head and is no more than 10% of the length of the single spiral oval thread, allowing the screw to be driven into differing materials, with low insertion torque and high insertion speed, that once fixed resists counter-clockwise turning moments as the material the screw is fixed into flexes in use.
Moreover, the twin spiral oval high-low thread holds the upper jointed material in position if shrinkage in that material occurs, eliminating the possibility of the screw sitting proud of the timber over time.
The pronounced single start gimlet tip allows the screw to start immediately into most modem building materials without the necessity of drilling a pilot hole.
The oval lock screw can be made from hardened carbon steel, brass or stainless steel, with either round, raised or countersunk heads.
A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which: FIGURE 1 shows the side elevation of the oval lock screw FIGURi 2 shows the oval shank and single start spiral oval thread and the underside of the head of the oval lock screw.
The screw of the invention, as shown in Figure 1 has an oval plain shank (7), a single coarse oval thread (3), a double oval high-low thread (5) on an oval shank 8, Figure 2 (8), where the ratio between diameters (11) and (12) is no less than 10:8 exhibiting high resistance to counter-clockwise movement of the screw (unseating) as the material it is driven into flexes in use.
The screw of the invention as shown in Figure 1 has an oval cross sectional area along the whole length of its shank (8) where conventional spiral thread types other than those shown in Figure 1 (3) and (5) can be formed and the efficiency of the screw's resistance to counter-clockwise movement (unseating) is not compromised so long as those other thread forms are oval in cross sectional area and the ratio between minor diameter (12) and outer diameter (ii) is no less than 10:8.
The screw of the invention, as shown in Figure 1, in this example, has a countertersw,jc head (2) with a collar (13) that enables a suitable size of recess (10) to be provided in the head without reducing the quantity of metal between the root of the recess and the outer lower edge of the head beyond a satisfactory amount for maintaining the slrength of the screw between the head and the shank (8), intended to eliminate cam-out' where the driver bit jumps out of the recess (10) and thereby reams out the drive recess.
The screw of the invention, as shown in Fig 1 has a head (2) equipped with a conventional driving means, for example, a cross recess (10) for receiving a power driver bit or screwdriver, but any conventional drive system can be incorporated As shown in Fig 1, the screw of the invention has a pronounced gimlet tip (9) which starts immediately even in the hardest of material.
As shown in Figure 1 and Figure 2, the screw of the invention has a single coarse oval thread (3), where the ratio between the pitch (4) and the oval major thread diameter (11) is 3:4 plus or minus 10%, being up to 50% coarser than general woodscrews, reducing insertion torque and allowing high insertion speed that is up to twice that of a conventional screw.
The screw of the invention, as shown in Figure 1, has a plain shank (7) no less than 15% of the full length of the screw, acting as a dowel, allowing the jointed material to clamp together, where a fully threaded screw tends to force (jack) apart the jointed components As shown in Fig 1, the screw of the invention has a double twin start oval high- low thread (5) securing the upper jointed material, eliminating screw protrusion in the event of material shrinkage over time As shown in Figure 1, the screw of the invention has a thread angle (14) no less than degrees and no more than 60 degrees, 40 degrees being the optimum angle for balance between pull out retention and thread cutting.
As shown in Figure 2, the screw of the invention has a head (2) circular not oval, allowing a neat and secure fix mto architecture such as handles and hinges.
The screw of the invention has a balance between core and surface hardness to exhibit both ductility (fifteen degrees of bend before snapping) and strength, intended to allow movement in application, resistance to breakage and resistance to recess damage, ideal for the new high density fibre floor boards where ductility is a necessity due to board movement.
Claims (10)
- I. The oval lock screw is characterised in that it has a shank (8) with an oval cross sectional area along its complete length, a single spiral oval thread (3) that starts in a pronounced gimlet point (9) at the tip, with an unthreaded oval portion of shank (7) and, in this instance, a twin spiral oval high-low thread (5) that finishes under the head (2) and is no more than 10% of the length of the single spiral oval thread (3), allowing the screw to be driven into differing materials, with low insertion torque and high insertion speed, that once fixed resists counter-clockwise turning moments as the material the screw is fixed into flexes in use.
- 2. An oval lock screw as claimed in claim I where the full length of the shank is of an oval cross section exhibiting high resistance to counter-clockwise movement (unseating) as the jointed material flexes in use.
- 3. An oval lock screw as claimed in any preceding claim where the spiral thread forms other than the ones shown in Fig 1 can be utiised without compromising the efficiency of the oval screw to resist counter-clockwise movement (unseating) as the jointed material flexes in use.
- 4. An oval lock screw as claimed in any preceding claim where the full length of the screw is of an oval cross section reducing insertion torque.
- 5. An oval lock screw as claimed in any preceding claim where the single oval thread is coarser than general screws exhibiting high insertion speed.
- 6. An oval lock screw as claimed in any preceding claim where the double oval I-I-Lo thread maintains the high insertion speed of the single oval thread.
- 7. An oval lock screw as claimed in any preceding claim where the double oval Hi-Lo thread engages into the upper jointed material so eliminating screw protrusion if material shrinkage Occurs.
- 8. An oval lock screw as claimed in any preceding claim where the head is of circular cross section allowing a neat fix into architectural hardware.
- 9. An oval lock screw as claimed in any preceding claim that exhibits sufficient surface hardness to allow the screw to be driven without a pilot hole into dense material with minimal recess damage
- 10. An oval lock screw as claimed in any proceeding claim ductile enough to withstand fifteen degrees of bend without snapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0721722A GB2454464B (en) | 2007-11-06 | 2007-11-06 | Oval lock screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0721722A GB2454464B (en) | 2007-11-06 | 2007-11-06 | Oval lock screw |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0721722D0 GB0721722D0 (en) | 2007-12-19 |
| GB2454464A true GB2454464A (en) | 2009-05-13 |
| GB2454464B GB2454464B (en) | 2012-05-16 |
Family
ID=38858186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0721722A Active GB2454464B (en) | 2007-11-06 | 2007-11-06 | Oval lock screw |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2454464B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014153444A1 (en) * | 2013-03-21 | 2014-09-25 | Simpson Strong-Tie Company, Inc. | Fastener with prolate cross-section |
| GB2564450A (en) * | 2017-07-11 | 2019-01-16 | Tite Range Dev Ltd | A fastener |
| US10480559B2 (en) | 2012-05-10 | 2019-11-19 | Simpson Strong-Tie Company, Inc. | Fastener with head cutting structure |
| US11181138B2 (en) | 2013-03-26 | 2021-11-23 | Simpson Strong-Tie Company, Inc. | Variable thread knurl fastener |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996018221A1 (en) * | 1994-12-09 | 1996-06-13 | Jonan Denki Seiki Ltd. | Terminal block |
-
2007
- 2007-11-06 GB GB0721722A patent/GB2454464B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996018221A1 (en) * | 1994-12-09 | 1996-06-13 | Jonan Denki Seiki Ltd. | Terminal block |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10480559B2 (en) | 2012-05-10 | 2019-11-19 | Simpson Strong-Tie Company, Inc. | Fastener with head cutting structure |
| WO2014153444A1 (en) * | 2013-03-21 | 2014-09-25 | Simpson Strong-Tie Company, Inc. | Fastener with prolate cross-section |
| US9651079B2 (en) | 2013-03-21 | 2017-05-16 | Simpson Strong-Tie Company, Inc. | Fastener with prolate cross-section |
| AU2014235942B2 (en) * | 2013-03-21 | 2018-02-22 | Simpson Strong-Tie Company, Inc. | Fastener with prolate cross-section |
| US11181138B2 (en) | 2013-03-26 | 2021-11-23 | Simpson Strong-Tie Company, Inc. | Variable thread knurl fastener |
| GB2564450A (en) * | 2017-07-11 | 2019-01-16 | Tite Range Dev Ltd | A fastener |
| GB2564450B (en) * | 2017-07-11 | 2022-07-20 | Tite Range Dev Ltd | A fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0721722D0 (en) | 2007-12-19 |
| GB2454464B (en) | 2012-05-16 |
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