GB2141803A - Screwing device - Google Patents
Screwing device Download PDFInfo
- Publication number
- GB2141803A GB2141803A GB08413308A GB8413308A GB2141803A GB 2141803 A GB2141803 A GB 2141803A GB 08413308 A GB08413308 A GB 08413308A GB 8413308 A GB8413308 A GB 8413308A GB 2141803 A GB2141803 A GB 2141803A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head
- shank
- recess
- screwing device
- screwing
- 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- Withdrawn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
- 230000000295 complement effect Effects 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 235000013351 cheese Nutrition 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000013585 weight reducing agent Substances 0.000 claims 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
- F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
- F16B23/003—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool star-shaped or multi-lobular, e.g. Torx-type, twelve-point star
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Forging (AREA)
Abstract
Head 5 is of frusto-conical shape having a height between its ends 6 and 7 which is less than the diameter of the shank 2. Driving recess 8 is provided with six lobes 9 engagable by a complementary spanner 16. This form of screwing device is of reduced weight compared with screwing devices with conventional heads. <IMAGE>
Description
SPECIFICATION
A screwing device of reduced weight in comparison with screwing devices for engagement by Allan
Keys
The invention relates to a screwing device, and particularly concerns a screwing device of relatively light weight in comparison with screwing devices currently in use such as, for example, known screw
ing devices engageable by Allan Keys.
Known screwing devices, in particular metal
screws, generally comprise a head, a shank fixed to
the head and a portion of the shank provided with a
screw thread. However, these devices have a mass
which is not negligeable and when they are used in
very large numbers to fix together many pieces of
metal the article thus fabricated has a mass greatly
exceeding the collective mass of the individual
pieces. It is an important fact that in the aeronautics
industry and in particular in the aerospace industry,
it is desired to reduce the mass of the equipment
with the aim of improving its performance.
An object of the invention is to provide a screwing
device, in particular a metal screw, the weight of
which is reduced in comparison with the known
metal screws normally used.
According to the invention there is provided a
screwing device comprising a head, a shank fixed to
the head, and a shank portion provided with a screw
thread, wherein the height of the head is less than
the diameter of the shank, the head comprises a
star-shaped recess, and externally the head has the
shape of a truncated cone.
The combination of these features makes it possi
ble to reduce the weight of the screwing device
formed in accordance with the invention in compari
son with screwing devices comprising a cylindrical
or cheese-shaped head, with an hexagonal recess.
The star-shaped recess constitutes a kind of
gearing and ensures better co-operation of the
complementary tightening spanner with the recess.
The tightening spanner can engage immediately
with the star-shaped recess with no need for the
operator to make repeated attempts to mate the
spanner with the recess.
For a device in accordance with the invention, a
weight reduction of up to 30% can be attained in
comparison with the weight of a known screw
having a cylindrical or cheese-shaped head with an
hexagonal recess and a shank of the same size as the
device in accordance with the invention.
The angle which is subtended between a generat
rix of the truncated-cone head and the axis of the
head can have a value of between 15 and 30 approximately.
The invention will now be further described, by
way of example, with reference to the accompanying
drawings in which:
Figure 1 is an elevation, partially in section, of a
screwing device formed according to the invention;
Figure 2 is an end-on view of the device in Figure
1;
Figure 3 is an elevation, partially in section, of a
known screwing device;
Figure 3A is an end view of the known device in
Figure 3; and
Figure 4 is a perspective view on an enlarged scale of the screwing device in Figures 1 and 2 and a tightening spanner.
With reference to Figures 1, 2 and 4, the screwing device 1 comprises a shank with a shank portion 3 provided with a screw thread 4, and a head 5 fixed to the shank 2.
More specifically, the head 5 has a height H, that is the distance between its top end 6 and bottom 7, which is less than the diameter of the shank.
The head 5 has the shape of a truncated cone.
Thus, the head is a frustum of cone with a circular base, the axis of revolution of the head being the axis of revolution XX of the shank portion 3.
The head 5 also comprises a star-shaped recess 8.
This recess is preferably provided with six lobes 9, each being demarcated by two arcuate sides 10 and 11 which are both concave towards the recess and interconnected by an arcuate side portion 12 which is convex with respect to the recess.
Figure 3 and 3A show a known screwing device 12' as hitherto used provided with a cylindrical or cheese shaped head 13, a screwtheaded shank portion 14 and a shank 15. As can readily be seen, the head 13 has a height H' which is equal to the diameter D' of the shank. Moreover, the recess 8' is of hexagonal shape 19 engagable by a known Allan key.
The angle a subtended in Figure 1 between a generatrix 16 of the head 5 and the longitudinal axis
XX of the head can have a value of between 15 and 30" approximately.
Figure 4 shows the screwing device 1 in relation to a spanner 16. The spanner 16 engages with the recess 8 through being provided with a complementary star-shaped cut-away portion 17 at its end 18.
The cut-away portion allows the spanner 16 readily to engage in the star-shaped recess 8. By reason of its shape the portion 17 does not readily wear.
The screwing device 1 can be 30% lighter than the screw 12 when made of the same material and having identical screw threaded shanks.
The screwing device is of a metal highly alloyed with refractory material, or titanium.
1. A screwing device comprising a head, a shank fixed to the head, and a shank portion provided with a screw thread, wherein the height of the head is less than the diameter of the shank, the head comprises a star-shaped recess, and externally the head has the shape of a truncated cone.
2. A screwing device according to the claim 1, in which the head is in the shape of a frustum of cone with a circular base and has an axis of revolution which is the longitudinal axis of the shank and an angle subtented by the generatrix of the frustum and the said axis has a value of between 15 and 30" approximately.
3. A screwing device according to claim 1 or claim 2, in which the recess comprises six lobes, each formed of two arcuate sides both concave
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A screwing device comprising a head, a shank fixed to the head, and a shank portion provided with a screw thread, wherein the height of the head is less than the diameter of the shank, the head comprises a star-shaped recess, and externally the head has the shape of a truncated cone.
2. A screwing device according to the claim 1, in which the head is in the shape of a frustum of cone with a circular base and has an axis of revolution which is the longitudinal axis of the shank and an angle subtented by the generatrix of the frustum and the said axis has a value of between 15 and 30" approximately.
3. A screwing device according to claim 1 or claim 2, in which the recess comprises six lobes, each formed of two arcuate sides both concave towards the recess and interconnected by an arcuate side portion which is convex with respect to the recess.
4. A screwing device according to any one of claims 1 to 3, arranged to co-operate with a spanner having an extremity which is star-shaped to engage the recess.
5. A screwing device according to any one of claims 1 to 4, formed of metal alloyed with refractory material, or titanium.
6. A screwing device substantially as hereinbefore described with reference to Figures 1,2 and 4 of the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8308739A FR2546584B1 (en) | 1983-05-26 | 1983-05-26 | REDUCED FEET BODY IN RELATION TO SIX HOLLOW HEADS |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8413308D0 GB8413308D0 (en) | 1984-06-27 |
GB2141803A true GB2141803A (en) | 1985-01-03 |
Family
ID=9289211
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08413308A Withdrawn GB2141803A (en) | 1983-05-26 | 1984-05-24 | Screwing device |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE3419330A1 (en) |
FR (1) | FR2546584B1 (en) |
GB (1) | GB2141803A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2809781A1 (en) * | 2000-06-06 | 2001-12-07 | Gfi Aerospace | FIXING MEMBER WITH AN END FINGERPRINT IN A THREADED TERMINAL PART |
US8771285B2 (en) | 2006-09-15 | 2014-07-08 | Zimmer Dental, Inc. | Drive tool for orthopedic screws |
US11234899B2 (en) | 2017-05-11 | 2022-02-01 | Scalpal Llc | Grasping facilitators and uses thereof and kits involving the same |
US11969864B2 (en) | 2017-05-11 | 2024-04-30 | Scalpal Llc | Multi-tier torque enhancer driver and/or receiver and method of using same |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB446714A (en) * | 1934-07-03 | 1936-05-05 | Phillips Screw Co | Improvements in screwdrivers for socketed screws |
GB542524A (en) * | 1939-05-26 | 1942-01-14 | Holo Krome Screw Corp | Improvements in or relating to socketed screws |
GB943521A (en) * | 1961-05-24 | 1963-12-04 | Eaton Mfg Co | Fastener |
GB1360644A (en) * | 1970-12-18 | 1974-07-17 | Robertson Mfg Co | Recessed screw having rounded reentrant surfaces |
GB1415174A (en) * | 1972-08-16 | 1975-11-26 | Ceag Ltd | Key for operating a security bolt |
GB1491515A (en) * | 1973-10-29 | 1977-11-09 | Yamamoto Byora Co Ltd | Screw-threaded fastener |
GB1498827A (en) * | 1975-03-25 | 1978-01-25 | Barlow J | Screw and screwdriver |
GB1564684A (en) * | 1977-03-07 | 1980-04-10 | Textron Inc | Socket head fasteners |
US4258596A (en) * | 1978-01-18 | 1981-03-31 | Southco, Inc. | Tamper-resistant fastener |
GB2093140A (en) * | 1981-02-12 | 1982-08-25 | Barber & Colman Ltd | Tamper resistant screws |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5757215Y2 (en) * | 1979-10-12 | 1982-12-08 |
-
1983
- 1983-05-26 FR FR8308739A patent/FR2546584B1/en not_active Expired
-
1984
- 1984-05-24 DE DE19843419330 patent/DE3419330A1/en not_active Withdrawn
- 1984-05-24 GB GB08413308A patent/GB2141803A/en not_active Withdrawn
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB446714A (en) * | 1934-07-03 | 1936-05-05 | Phillips Screw Co | Improvements in screwdrivers for socketed screws |
GB542524A (en) * | 1939-05-26 | 1942-01-14 | Holo Krome Screw Corp | Improvements in or relating to socketed screws |
GB943521A (en) * | 1961-05-24 | 1963-12-04 | Eaton Mfg Co | Fastener |
GB1360644A (en) * | 1970-12-18 | 1974-07-17 | Robertson Mfg Co | Recessed screw having rounded reentrant surfaces |
GB1415174A (en) * | 1972-08-16 | 1975-11-26 | Ceag Ltd | Key for operating a security bolt |
GB1491515A (en) * | 1973-10-29 | 1977-11-09 | Yamamoto Byora Co Ltd | Screw-threaded fastener |
GB1498827A (en) * | 1975-03-25 | 1978-01-25 | Barlow J | Screw and screwdriver |
GB1564684A (en) * | 1977-03-07 | 1980-04-10 | Textron Inc | Socket head fasteners |
US4258596A (en) * | 1978-01-18 | 1981-03-31 | Southco, Inc. | Tamper-resistant fastener |
GB2093140A (en) * | 1981-02-12 | 1982-08-25 | Barber & Colman Ltd | Tamper resistant screws |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2809781A1 (en) * | 2000-06-06 | 2001-12-07 | Gfi Aerospace | FIXING MEMBER WITH AN END FINGERPRINT IN A THREADED TERMINAL PART |
EP1162376A1 (en) * | 2000-06-06 | 2001-12-12 | GFI Aerospace | Fixing member with a recess at the end of its threaded shank |
US6632057B1 (en) | 2000-06-06 | 2003-10-14 | Gfi Aerospace | Fixing unit with an end imprint in a threaded terminal portion |
US8771285B2 (en) | 2006-09-15 | 2014-07-08 | Zimmer Dental, Inc. | Drive tool for orthopedic screws |
US11234899B2 (en) | 2017-05-11 | 2022-02-01 | Scalpal Llc | Grasping facilitators and uses thereof and kits involving the same |
US11458071B2 (en) | 2017-05-11 | 2022-10-04 | Scalpal Llc | Torque enhancer device for grasping and tooling, and assemblies and uses thereof |
US11944587B2 (en) | 2017-05-11 | 2024-04-02 | Scalpal Llc | Grasping facilitators and uses thereof and kits involving the same |
US11963933B2 (en) | 2017-05-11 | 2024-04-23 | Scalpal Llc | Torque enhancer device for grasping and tooling, and assemblies and uses thereof |
US11969864B2 (en) | 2017-05-11 | 2024-04-30 | Scalpal Llc | Multi-tier torque enhancer driver and/or receiver and method of using same |
Also Published As
Publication number | Publication date |
---|---|
DE3419330A1 (en) | 1985-02-28 |
FR2546584A1 (en) | 1984-11-30 |
GB8413308D0 (en) | 1984-06-27 |
FR2546584B1 (en) | 1985-08-30 |
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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) |