GB2357326A - Cap assembly - Google Patents
Cap assembly Download PDFInfo
- Publication number
- GB2357326A GB2357326A GB9929646A GB9929646A GB2357326A GB 2357326 A GB2357326 A GB 2357326A GB 9929646 A GB9929646 A GB 9929646A GB 9929646 A GB9929646 A GB 9929646A GB 2357326 A GB2357326 A GB 2357326A
- Authority
- GB
- United Kingdom
- Prior art keywords
- assembly according
- cap
- washer
- drill
- screw
- 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- Withdrawn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
- 239000004952 Polyamide Substances 0.000 claims description 9
- 229920002647 polyamide Polymers 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims description 4
- 239000012779 reinforcing material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005253 cladding Methods 0.000 description 3
- 229920003188 Nylon 3 Polymers 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
- F16B37/00—Nuts or like thread-engaging members
- F16B37/14—Cap nuts; Nut caps or bolt caps
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
A cap-assembly for a drill-screw comprises a cap-member 10 and a washer-member 20. The cap-member 10 has a first portion 11 and a second portion 12. The first portion 11 has an internal configuration 13 to engage the drive of the drill-screw. The second portion 12 consists of a generally annular collar coaxial with the first portion 11 and is further provided with an undercut 14 to receive and retain the washer-member 20 in position. The washer-member is provided with a "stepped" diameter, shown schematically at 21A, 21B and 21C, whereby the washer-member 20 is adapted to "snap-fit" into the annular collar 12.
Description
2357326 CAP ASSEMBLY This invention relates to a cap assembly and in
particular to a cap assembly for use in connection with a drill-screw.
Drill-screws are generally used for fixing materials such as panelling or cladding to the surfaces of a building (e.g. a wall). Drill-screws currently available are provided with an integral cap which is moulded around and/or adhered to the drive-portion of the drill-screw. Although it is possible to remove the cap from the drill-screw, such removal invariably damages the cap beyond repair or re-use and may also damage the drill screw and/or the panelling or cladding.
We have devised a cap assembly which is removable from the drill-screw (and consequently re-usable) without damage to the cap, the drill-screw or any associated panelling or cladding.
Accordingly, the present invention provides a cap assembly adapted to be removably attached to a drill-screw, in which the assembly comprises:
(a) a cap-member adapted to engage the drive-portion of the drill- screw; and (b) a washer-member adapted to co-operate with the cap-member (a) whereby the drive-portion is removably retained between said members (a) and (b).
Preferably, the cap-member (a) comprises a first portion adapted to engage the drive-portion of the drill-screw and a second portion, integral with the first, to receive and removably retain the washer-member (b).
2 In a particularly preferred embodiment of the present invention, the first portion is internally configured so as to engage, in use, the driveportion of the drill-screw and externally configured so as to engage, in use, drive means for rotating the drill-screw (for example, a socket or the chuck of a drill).
Suitably, the said internal configuration may be of triangular, rectangular (e.g. square) or generally hexagonal transverse section, while the external configuration may be provided by means of a plurality of splines or similar keying.
Preferably, the second portion of the cap-member(a) comprises a generally annular collar extending axially from the first portion. More preferably, the second portion is coaxial with the first portion. The second portion may optionally be provided with an undercut to receive and removably retain the washer-member (b).
Suitably, the angle of the undercut is in the range 30 to 70", preferably about 500, relative to the axis of the collar.
Preferably, the washer-member (b) is of generally annular configuration, having a "stepped" diameter whereby in use it can engage and be removably retained within the collar.
Both the cap-member(a) and the washer-member (b) may be made of a mouldable plastics material. A particularly suitable mate rial for this purpose is a polyamide or mixture of polyamides, which can optionally contain one or more reinforcing materials such as glass. A preferred example of a material from which the cap-member (a) and washer member (b) can be made is a glass -reinforced polyamide (e.g. NYLON) 3 in which the ratio of polyamide to glass is in the range 99:1 to 50:50 by weight, preferably 70:30 by weight.
In use, the cap-member (a) is engaged with the outer portion of the drive of the drill-screw, while the washer-member (b) is threaded over the shank of the drill-screw and engaged with the collar of the cap member (a).
Optionally, a further (sealing) washer can be provided with the assembly.
The present invention will be illustrated, merely by way of example, in the following description and with reference to the accompanying drawing.
Registered Trade Mark The single drawing figure is a longitudinal section through a cap assembly according to the present invention.
The cap assembly comprises a cap-member 10 and a washer-member 20.
The cap-member 10 has a first portion 11 to engage the drive of a drill screw (not shown) and a second portion 12 to receive the washer member 20. The first portion 11 has an internal configuration 13 to engage the drive of the drill-screw. The second portion 12 consists of a generally annular collar coaxial with the first portion 11 and is further provided with an undercut 14 to receive and retain the washer-member 20 in position. The washer-member is provided with a "stepped" diameter, shown schematically at 21A, 21B and 21C, whereby the washer member 20 is adapted to "snap-fit" into the annular collar 12.
4
Claims (21)
1. A cap-assembly adapted to be removably attached to a drill-screw, in which the assembly comprises:
(a) a cap-member adapted to engage the drive-portion of the drill-screw; and (b) a washer-member adapted to co-operate with the cap- member (a) whereby the drive-portion is removably retained between said members (a) and (b).
2. An assembly according to Claim 1, in which the cap-member (a) comprises a first portion adapted to engage the drive-portion of the drill screw and a second portion, integral with the first, to receive and removably retain the washer-member (b).
C, - -
3. An assembly according to Claim 2, in which the first portion is internally configured so as to engage, in use, the drive-portion of the drill-screw and externally configured so as to engage, in use, drive means for rotating the drill-screw.
4. An assembly according to Claim 3, in which the drive means for rotating the drill-screw comprises a socket or the chuck of a drill.
5. An assembly according to Claim 3 or 4, in which the internal configuration of the first portion is of triangular, rectangular or hexagonal transverse section.
6. An assembly according to Claim 5, in which the internal configuration of the first portion is of square transverse section.
7. An assembly according to any one of Claims 3 to 6, in which the external configuration of the first portion comprises a plurality of splines or similar keying.
8. An assembly according to any one of Claims 2 to 7, in which the second portion of the cap-member (a) comprises a generally annular collar extending axially from the first portion.
9. An assembly according to Claim 8, in which the second portion is coaxial with the first portion.
10. An assembly according to Claim 8 or 9, in which the second portion is provided with an undercut to receive and removably retain the washer-member (b).
11. An assembly according to Claim 10, in which the angle of the undercut, relative to the axis of the collar, is in the range 30' to 70'.
12. An assembly according to Claim 11, in which the angle is: I_.
about 50.
13. An assembly according to any one of the preceding claims, in which the washer-member (b) is of generally annular configuration, having a "stepped" diameter whereby, in use, said washer-member can engage and be removably retained within the cap-member (a).
14. An assembly according to any one of the preceding claims, in which the cap-member (a) and the washer-member (b) are each made of a mouldable plastics material.
6
15. An assembly according to Claim 14, in which the plastics material comprises a polyamide or a mixture of polyamides.
16. An assembly according to Claim 15, in which the plastics material contains one or more reinforcing materials.
17. An assembly according to Claim 16, in which the reinforcing material comprises glass.
18. An assembly according to any one of Claims 14 to 17, in which the cap-member (a) and the washer-member (b) are each made of a glass reinforced polyamide wherein the ratio of polyamide to glass is in the range 99:1 to 50:50 by weight.
19. An assembly according to Claim 18, in which the ratio of polyamide to glass is 70:30 by weight.
20. An assembly according to any one of the preceding claims, further c.; 1 comprising an additional (sealing) washer.
21. A cap-assembly, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9929646A GB2357326A (en) | 1999-12-16 | 1999-12-16 | Cap assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9929646A GB2357326A (en) | 1999-12-16 | 1999-12-16 | Cap assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9929646D0 GB9929646D0 (en) | 2000-02-09 |
| GB2357326A true GB2357326A (en) | 2001-06-20 |
Family
ID=10866374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9929646A Withdrawn GB2357326A (en) | 1999-12-16 | 1999-12-16 | Cap assembly |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2357326A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0506414A1 (en) * | 1991-03-27 | 1992-09-30 | Itw Limited | Screw/cap assemblies |
-
1999
- 1999-12-16 GB GB9929646A patent/GB2357326A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0506414A1 (en) * | 1991-03-27 | 1992-09-30 | Itw Limited | Screw/cap assemblies |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9929646D0 (en) | 2000-02-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| COOA | Change in applicant's name or ownership of the application | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |