GB2370083A - Woodscrew having a removable head - Google Patents
Woodscrew having a removable head Download PDFInfo
- Publication number
- GB2370083A GB2370083A GB0030811A GB0030811A GB2370083A GB 2370083 A GB2370083 A GB 2370083A GB 0030811 A GB0030811 A GB 0030811A GB 0030811 A GB0030811 A GB 0030811A GB 2370083 A GB2370083 A GB 2370083A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head
- screw
- woodscrew
- removable head
- headless
- 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
- 239000002023 wood Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 6
- 238000003754 machining Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000587161 Gomphocarpus Species 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011093 chipboard Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 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
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
A wood screw comprises a head and a threaded shank. The shank has a flat or blunt tip includes a weakened portion so that the head can be separated from the shank.
Description
LOST-HEAD OR HEADLESS WOOD SCREW
This patent refers to a lost-head or headless wood screw.
In woodworking, cabinet making, building (etc. ) there are three main methods of joining and fixing wood, MDF, chipboard etc. , these are: 1. Gluing 2. Nailing 3. Screwing
Each of these methods has advantages and disadvantages as outlined below:
Glue : Has the advantage that it can be machined when the fixing process is complete, however the disadvantages are: the final strength and the need for protracted curing or setting periods.
Nails : Whilst this method of fixing is instantaneous and the nail heads can be driven below the surface with a punch to allow additional machining, nailed or pinned assemblies generally lack strength.
Screws: Screwed assemblies have the advantages of strength and are assembled instantaneously, however, the end result, particularly in furniture manufacture requires the unsightly screw heads to be masked or covered. Additional machining is also difficult due to the obstruction caused by the screw head.
The headless or lost-head screw is a device whereby all the advantages of the above fixing methods are achieved without the disadvantages.
According to the present invention the lost-head/headless screw is a wood screw with a blunt tip and a weak/shear zone between the head and screwed section.
As the torque increase the screw head snaps off at the shear zone.
The specific embodiment of this invention will now be described by way of example with reference the accompanying diagrams of which: Figure 1. Shows the general construction.
The screw has a flat tip (a) and weak/shear section (b).
Figures 2,3 and 4 show the application, installation and operation.
Application and Installation Method 1. A pilot hole is drilled in the pieces of material to be joined (Fig 2).
2. The screw is inserted and tightened (Fig 3).
3. As the screw has a flat tip when it reaches the limit of the pre-drilled pilot hole the torque increases and the screw shears at the weak point leaving the screw section joining the two pieces of material (Fig 4).
The advantages of this type of fixing are : 1. the screw, once'the head has sheared off, is below the surface allowing further surface machining ; 2. has the strength of a screwed assembly ; 3. the actions are quick and easy to perform with no protracted periods waiting for glue to set.
Claims (2)
- CLAIMS 1. The lost-head or headless woodscrew is a woodscrew with a flat tip and weak/ shear point between the screw section and the head.
- 2. The lost-head or headless woodscrew is described herein with reference to: Figure 1, Figure 2, Figure 3 and Figure 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0030811A GB2370083B (en) | 2000-12-18 | 2000-12-18 | Lost-head or headless wood screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0030811A GB2370083B (en) | 2000-12-18 | 2000-12-18 | Lost-head or headless wood screw |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0030811D0 GB0030811D0 (en) | 2001-01-31 |
| GB2370083A true GB2370083A (en) | 2002-06-19 |
| GB2370083B GB2370083B (en) | 2003-08-27 |
Family
ID=9905294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0030811A Expired - Fee Related GB2370083B (en) | 2000-12-18 | 2000-12-18 | Lost-head or headless wood screw |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2370083B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1018172A3 (en) * | 2008-06-05 | 2010-06-01 | Lefebvre Guy | Clamping device, has screw head fixed on small cylindrical hole by screwing tool, flat shoulder fixed in surface of screw head and connected with back side of screw head, where hole is formed in area formed above screw |
| TWI615556B (en) * | 2016-03-24 | 2018-02-21 | High tension screw |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3150434A1 (en) * | 1981-12-19 | 1983-06-30 | Erich 7142 Marbach Fischer | Break-off screw |
| US5372466A (en) * | 1993-04-16 | 1994-12-13 | O'berry; Jon L. | Device to eliminate squeaks in floors and method |
-
2000
- 2000-12-18 GB GB0030811A patent/GB2370083B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3150434A1 (en) * | 1981-12-19 | 1983-06-30 | Erich 7142 Marbach Fischer | Break-off screw |
| US5372466A (en) * | 1993-04-16 | 1994-12-13 | O'berry; Jon L. | Device to eliminate squeaks in floors and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1018172A3 (en) * | 2008-06-05 | 2010-06-01 | Lefebvre Guy | Clamping device, has screw head fixed on small cylindrical hole by screwing tool, flat shoulder fixed in surface of screw head and connected with back side of screw head, where hole is formed in area formed above screw |
| TWI615556B (en) * | 2016-03-24 | 2018-02-21 | High tension screw |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2370083B (en) | 2003-08-27 |
| GB0030811D0 (en) | 2001-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20111218 |