GB2194827A - Driving formations of screws - Google Patents
Driving formations of screws Download PDFInfo
- Publication number
- GB2194827A GB2194827A GB08719327A GB8719327A GB2194827A GB 2194827 A GB2194827 A GB 2194827A GB 08719327 A GB08719327 A GB 08719327A GB 8719327 A GB8719327 A GB 8719327A GB 2194827 A GB2194827 A GB 2194827A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head
- screw
- holes
- screws
- centre
- 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- Withdrawn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
- 230000015572 biosynthetic process Effects 0.000 title abstract 2
- 238000005755 formation reaction Methods 0.000 title abstract 2
- 241000826860 Trapezium Species 0.000 claims 1
- 229910003460 diamond Inorganic materials 0.000 claims 1
- 239000010432 diamond Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 2
- 239000002023 wood Substances 0.000 description 2
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
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0069—Specially shaped nuts or heads of bolts or screws for rotations by a tool with holes to be engaged with corresponding pins on the tool or protruding pins to be engaged with corresponding holes on the tool
-
- 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
- B25B13/485—Spanners; Wrenches for special purposes for theft-proof screws, bolts or nuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
A security screw has a head with between three and six, preferably four, holes formed therein as driving formations. The head has no slot or slots, and is circular in cross-section, and can only be driven by a driver which has a head with projecting pins in a configuration corresponding to the holes in the screw head. The driver also has a collar of the same depth as the pins for fitting around the outer circular edge of the screw head. For additional security not all screws in an installation have the same screw head design, the configurations differing in the number, size, shape, and/or configuration of the holes, and requiring a corresponding set of driver head designs. <IMAGE>
Description
SPECIFICATION
Screws
The present invention relates to screws, and more specifically to security screws. The term "screw" here means a screw-threaded device, including a bolt.
An ordinary wood screw has a head which may have a simple slot so that the screw can be turned by means of a standard screwdriver, or may have a crossed slot which can also be turned by means of readily available screwdrivers with cross heads. Bolts may have similar heads, or may have hexagonal (or square) heads which may similarly be turned by standard and readily available spanners.
These screws can thus readily be undone by anyone with ordinary tools.
The object of the present invention is to provide a system which gives a substantially higher degree of security.
According to one aspect, the present invention provides a screw having a head with four or more holes formed therein. The head naturally has no slot or slots, and is circular (i.e.
not square or hexagonal). Such a screw cannot be turned by a conventional screwdriver or spanner, but only by a specially made driver having projecting pins of the appropriate size, shape, and configuration to match the holes in the screw head.
According to another aspect of the invention, there is provided a set of screw head designs each of which has a different configuration of holes therein, the configurations differing in the number, size, shape, and/or configuration of the holes, and a corresponding set of drive head designs, such that each driver head design will fit only the corresponding screw head design.
According to a further aspect of the invention, there is provided a driver having a head with a plurality of projecting pins and a collar, for driving a screw having a corresponding configuration of holes, with the collar of the driver head fitting aound the outer circular edge of the screw head.
Various screws and drivers in accordance with the invention will now be described, by way of example, with reference to the drawings, in which:
Figures 1A to 1C show three screws, with their heads shown in section;
Figure 2 is a common end view of these screws, showing the head pattern;
Figure 3A is a section plane through a driver head for these screws;
Figure 3B is the end view of the driver head; and
Figure 4 shows a set of six mutually exclusive head patterns or configurations.
Referring to the drawings, Fig. 1A shows a wood screw with a round head 10 (shown in section) having four holes 11 therein instead of the usual slot or crossed slots. Fig. 2 shows the hole pattern as seen end-on. Fig.
1B shows a bolt having a circular head with the same hole pattern, and Fig. 1C shows a partially threaded bolt with a round countersunk head again having the same hole pattern.
Fig. 3A is a section plane through a driver head for these screws, and Fig. 3B is an end view of the driver head. The driver head comprises four pins 13 arranged to correspond with the pattern of holes of the screw head shown in Fig. 2. It is obvious that the screws of Figs. 1A to 1C cannot be turned by conventional tools (screwdrivers or spanners) but can be turned by a driver having the head shown in Figs. 3A and 38.
The driver head also includes a collar 12, which is as deep as the pins 13. This collar ensures that the driver head must be properly seated on the screw before the screw can be turned; thus it prevents the driver head from being engaged in an offset position with only two of the four pins 13 engaging the holes 11. The collar 12 also serves the further function of providing additional engagement of the driver with the screw head if the pattern of the pins and holes is generally offset to one side of the centre of the pattern.
There may be circumstances in which it is desired to provide additional security, so that not all screws in a given installation can be unscrewed by means of the same driver. To achieve this, it is necessary to provide a plurality of distinct patterns or configurations for the holes in the heads, such that each of the corresponding driver configurations will fit only its own head configuration.
Fig. 4 shows a set of six configurations A to F of four pins or holes which are mutually exclusive, in the sense that a driver for any one of the configurations will not fit a screw with any of the other configurations. The pins or holes may have different angular spacings around the centre of the screw head in different patterns, as with patterns A and F. They may have difference distances from the centre of the pattern, as with patterns B and E.
There may be a centre pin, as with patterns C and D. It is readily seen that a driver for any given one of these patterns will not fit a screw head of any other pattern. It will be noted that the provision of the collar on the driver head ensures that a driver of pattern A will not fit a screw of pattern B and vice versa.
It will be realized that different set of mutually exclusive patterns can be achieved by the use of pins of different sizes, or by the use of pins of different shapes, or by the use of different numbers of pins. For practical reasons, the number of pins cannot conveniently be less than three or more than five or six.
The combination of varying the angular positions of the pins, their radial positions, their shapes, and the number of pins means that a large number of mutually exclusive patterns can be generated.
Claims (15)
1. A screw having a circular head with four or more holes formed therein.
2. A screw according to claim 1 wherein there are four holes at the vertexes of a square centred on the centre of the screw head.
3. A screw according to claim 1 wherein there are four holes at the vertexes of a square offset from the centre of the screw head.
4. A screw according to claim 1 wherein there are four holes at the vertexes of a diamond centred on the centre of the screw head.
5. A screw according to claim 1 wherein there are four holes at the vertexes of a trapezium surrounding the centre of the screw head.
6. A screw according to claim 1 wherein there are four holes one at the centre of the screw head and the other three symmetrically placed around the centre of the screw head.
7. A screw according to claim 1 wherein there are four holes one at the centre of the screw head and the other three symmetrically placed around the centre of the screw head.
8. For a screw according to any previous claim, a driver having a head with a plurality of projecting pins in a configuration corresponding to the holes in the screw head and having a collar of the same depth as the pins for fitting around the outer circular edge of the screw head.
9. A set of screws having a plurality of distinct head designs each of which has a different configuration of holes therein, the configurations differing in the number, size, and/or arrangement of the holes.
10. A set of screws having a plurality of distinct head designs each according to a different one of claims 2 to 7.
11. For a set of screws according to claim 9 or claim 10, a set of drivers each having a head with a plurality of projecting pins in a configuration corresponding to the holes in a different one of the patterns of screw head and having a collar of the same depth as the pins for fitting around the outer circular edge of the screw head.
12. A security screw substantially as herein described.
13. A driver for the security screw of claim 12, substantially as herein described.
14. A set of distinct security screws substantially as herein described.
15. A set of drivers for the set of security screws of claim 14, substantially as herein described.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB868619770A GB8619770D0 (en) | 1986-08-14 | 1986-08-14 | Screws |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8719327D0 GB8719327D0 (en) | 1987-09-23 |
GB2194827A true GB2194827A (en) | 1988-03-16 |
Family
ID=10602694
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB868619770A Pending GB8619770D0 (en) | 1986-08-14 | 1986-08-14 | Screws |
GB08719327A Withdrawn GB2194827A (en) | 1986-08-14 | 1987-08-14 | Driving formations of screws |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB868619770A Pending GB8619770D0 (en) | 1986-08-14 | 1986-08-14 | Screws |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB8619770D0 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2651284A1 (en) * | 1989-08-24 | 1991-03-01 | Louail Regis | Anti-theft system |
WO1995022699A1 (en) * | 1994-02-16 | 1995-08-24 | Confon Ag | Security lock for protecting nuts and bolts holding components together |
GB2295343A (en) * | 1994-11-22 | 1996-05-29 | Boc Group Plc | Socket |
US6044670A (en) * | 1999-01-12 | 2000-04-04 | Citurs; Kirk A. | Theft prevention device |
WO2003072962A1 (en) * | 2002-02-26 | 2003-09-04 | Degima Medizinprodukte Gmbh | Threaded device with improved resistance against torsion-caused breakage |
WO2006047171A1 (en) * | 2004-10-26 | 2006-05-04 | Trade Management Group Limited | Security screw |
GB2421922A (en) * | 2005-01-10 | 2006-07-12 | Paul Cornwall | Non slip screwdriver and corresponding screw |
EP1777038A1 (en) * | 2005-10-21 | 2007-04-25 | Adl S.A.S. | Coded wrench for a theftproof rim |
WO2020130900A1 (en) * | 2018-12-12 | 2020-06-25 | Zaid Yousef Yacoub | A tool grip for a joint element |
CN114877750A (en) * | 2022-05-12 | 2022-08-09 | 北京汽车集团越野车有限公司 | General mounting structure of outer drapes |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB535346A (en) * | 1939-10-03 | 1941-04-07 | Herbert Ellis Mair | Improvements in or relating to binding posts |
GB556145A (en) * | 1942-02-19 | 1943-09-22 | Frederick William Dixon | Improvements in or relating to grub screws adapted to be rotated by some form of key |
GB1272215A (en) * | 1968-05-22 | 1972-04-26 | James Maxwell Craig | Improvements in bolt heads and nuts |
GB2006371A (en) * | 1977-10-04 | 1979-05-02 | Hart H | Fastening means |
GB2082709A (en) * | 1980-08-23 | 1982-03-10 | Robinson Derek Hugh | Disc nut and disc-headed bolt |
GB2095356A (en) * | 1981-03-24 | 1982-09-29 | Groppo Domenico | Antitheft device for bolts or nuts |
EP0070247A2 (en) * | 1981-07-15 | 1983-01-19 | FRANCAISE D'ACCESSOIRES AUTOMOBILES F2A Société Anonyme | Universal anti-theft device, especially for nuts and bolts to fix car-wheels |
-
1986
- 1986-08-14 GB GB868619770A patent/GB8619770D0/en active Pending
-
1987
- 1987-08-14 GB GB08719327A patent/GB2194827A/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB535346A (en) * | 1939-10-03 | 1941-04-07 | Herbert Ellis Mair | Improvements in or relating to binding posts |
GB556145A (en) * | 1942-02-19 | 1943-09-22 | Frederick William Dixon | Improvements in or relating to grub screws adapted to be rotated by some form of key |
GB1272215A (en) * | 1968-05-22 | 1972-04-26 | James Maxwell Craig | Improvements in bolt heads and nuts |
GB2006371A (en) * | 1977-10-04 | 1979-05-02 | Hart H | Fastening means |
GB2082709A (en) * | 1980-08-23 | 1982-03-10 | Robinson Derek Hugh | Disc nut and disc-headed bolt |
GB2095356A (en) * | 1981-03-24 | 1982-09-29 | Groppo Domenico | Antitheft device for bolts or nuts |
EP0070247A2 (en) * | 1981-07-15 | 1983-01-19 | FRANCAISE D'ACCESSOIRES AUTOMOBILES F2A Société Anonyme | Universal anti-theft device, especially for nuts and bolts to fix car-wheels |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2651284A1 (en) * | 1989-08-24 | 1991-03-01 | Louail Regis | Anti-theft system |
WO1995022699A1 (en) * | 1994-02-16 | 1995-08-24 | Confon Ag | Security lock for protecting nuts and bolts holding components together |
GB2295343A (en) * | 1994-11-22 | 1996-05-29 | Boc Group Plc | Socket |
GB2295343B (en) * | 1994-11-22 | 1998-01-14 | Boc Group Plc | Handwheel socket |
US6044670A (en) * | 1999-01-12 | 2000-04-04 | Citurs; Kirk A. | Theft prevention device |
WO2003072962A1 (en) * | 2002-02-26 | 2003-09-04 | Degima Medizinprodukte Gmbh | Threaded device with improved resistance against torsion-caused breakage |
WO2006047171A1 (en) * | 2004-10-26 | 2006-05-04 | Trade Management Group Limited | Security screw |
GB2421922A (en) * | 2005-01-10 | 2006-07-12 | Paul Cornwall | Non slip screwdriver and corresponding screw |
EP1777038A1 (en) * | 2005-10-21 | 2007-04-25 | Adl S.A.S. | Coded wrench for a theftproof rim |
WO2020130900A1 (en) * | 2018-12-12 | 2020-06-25 | Zaid Yousef Yacoub | A tool grip for a joint element |
CN114877750A (en) * | 2022-05-12 | 2022-08-09 | 北京汽车集团越野车有限公司 | General mounting structure of outer drapes |
Also Published As
Publication number | Publication date |
---|---|
GB8619770D0 (en) | 1986-09-24 |
GB8719327D0 (en) | 1987-09-23 |
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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) |