GB2068492A - Nut with protective cap - Google Patents
Nut with protective cap Download PDFInfo
- Publication number
- GB2068492A GB2068492A GB8019588A GB8019588A GB2068492A GB 2068492 A GB2068492 A GB 2068492A GB 8019588 A GB8019588 A GB 8019588A GB 8019588 A GB8019588 A GB 8019588A GB 2068492 A GB2068492 A GB 2068492A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nut
- protective cap
- depression
- rim
- cap
- 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- Withdrawn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
- 230000001681 protective effect Effects 0.000 title claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000001771 impaired effect Effects 0.000 abstract description 3
- 230000006978 adaptation Effects 0.000 abstract description 2
- 229910000679 solder Inorganic materials 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- -1 e.g. Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000003466 welding 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
- 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)
- Connection Of Plates (AREA)
- Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
Abstract
A nut for a screw bolt has a protective cap (2) secured nondetachably to one side (4). In order to produce a nondetachable and fluid-tight connection between the nut and cap without the spanner attack surface being impaired, whilst achieving minimum material consumption and permitting adaptation of the cap to different lengths of bolt, a depression (6) is produced in the side (4) and the cap secured within it. The cap (2) may be alternatively of disc-shape, Fig. 6 (not shown). The cap may be secured by deforming the depression rim as at 8 or by adhesive or solder. <IMAGE>
Description
SPECIFICATION
Nut with a protective cap
The present invention relates to a nut with a protective cap, the cap being non-detachably secured to the head side of the nut.
A nut of this type is known from German
Offenlegungsschrift 26 07 701. In this nut a part of the external surface of a hexagonal nut is machined, by turning, into circular cylindrical shape. Then a protective cap somewhat of the shape of a hollow hemisphere is placed on the said turned region. The connection of the protective cap to the hexagonal nut is effected by butt welding, during which the protective cap and the screw nut are heated. The inner edge of the head side of the screw then becomes bent inwards. In this way a self securing box nut is supposed to be produced. Due to the bending over of the inner edge of the head side of the screw nut it is impossible to screw the bolt beyond the head side of the nut. The nut is therefore unsuitable for screw bolts which project beyond the head side.
The turning of a hexagonal nut is more complicated than the turning of circular cylindrical parts because of the projecting edges. Part of the spanner attack surface is lost by the turning of the screw nut on its-outer peripheral surface. For a given overall height of the screw nut, therefore, a reduced part of the external surface is available as a spanner attack surface. Consequently the screw cannot be tightened and removed very satisfactorily. For the attachment of the protective cap to the nut it is necessary for both to be considerably heated. This can lead to a distortion of the nut, so that the screw-thread becomes distorted.
In German Offenlegungsschrift 27 28 480 a method of producing a wheel nut with welded protective cap is previously described, wherein the protective cap is inverted subsequently over the external circumference of the hexagonal nut.
However, the screw attack surface is impaired in this manner. Because the protective cap is welded to the wheel nut at specific points, it is no longer detachable, so that a different size of spanner is necessary for screwing and for releasing the screw. At powerful tightening torques there is a danger that this protective cap may become distorted with reference to the nut. Thus correct fixing is no longer possible. Because the protective cap is drawn out over a large part of the screw, a great deal of material is consumed.
A nut closed at one end by a cap is known from
German Gebrauchsmuster 75 14493. This cap is of highly complicated construction and engages into the nut both from the inside and from the outside, whilst the nut is turned away at the spanner attack surface. The external turning of a hexagonal nut has the disadvantages, already stated hereinbefore, of a reduction of the spanner attack surface and of a somewhat complicated turning procedure. Because this cap also engages into the screw nut internally, the space available for the screw bolt is thereby also reduced. This protective cap is therefore not suitable for screw bolts passing through the head side of the nut.
Due to the application process, no complete sealing is possible. This cap cannot therefore provide rust protection, such as is desirable for the use of screw outdoors, e.g., on motor cars and lorries.
A method of producing a box nut is likewise described in German Offenlegungsschrift 22 08 528. According to this method a special tool is necessary in order to deform the nut with a fixed protective cap. This method is comparatively complicated and furthermore requires much material. It is not possible to use all materials, e.g., plastics caps with steel nuts. It is also impossible to attach protective caps of different length to the nuts without changing tools.
An advantage of the invention is that it makes it possible to construct a nut having a protective cap which is non-detachably secured to the head side of the nut so that non-detachable and fluid-tight connection is produced, without the spanner attack surface being impaired, whilst achieving a minimum of material consumption and permitting a simple adaptation of the protective cap height to different lengths of screw-threaded bolts.
According to the invention, there is provided a nut of the aforesaid type, particularly a hexagonal nut, polygonal nut, round or flanged nut, wherein:
a) a depression is formed in the head side of the nut without influencing the spanner attack surface thereof,
b) the protective cap is of pot-shaped or discshaped construction, and
c) the free end or the rim of the pot-shaped or disc-shaped protective cap is fitted into the depression. Further embodiments of the invention are described in the claims 2 to 12.
The invention makes it possible to achieve in simple manner weather protection and impact protection for the screwthreads of screw bolts, which is fully efficacious for a small additional outlay. Customary nuts need only be slightly modified for this purpose. The hexagonal nut according to the object of the invention is of particular significance in the wheel fastening of lorries and motor cars, particularly in the fastening of projecting wheel bolts. Due to weather influences and spray water, in spite of rushinhibiting surface treatments moisture penetrated between wheel bolt and wheel nut. Heavy corrosion then occured in conjunction with the salt content of the spray water during winter operation. Particulary when dismantling a wheel which had been in service for a long time, this corrosion lead to damage to the wheel bolts.It is furthermore expensive and complicated to change the wheel bolt in the case of material welds and damage to screw-threads.
By adopting the invention it is also possible to use standard parts hitherto used and to provide them with a protective cap after a specific modification.
According to the invention a depression is applied to the head side of the nut. The protective
cap is fitted into said depression. Said protective
cap may be of pot-shaped or disc-shaped
construction.
The depression is preferably arranged
cyiindrically at the side of the screw-thread. But it
may also be applied annularly. The depression
may be produced by turning or preferably by 'pressing, particularly by cold pressing.
The nondetachable securing of nut and
protective cap is effected most conveniently by plastic deformation of the ambient region of the depression of the head side towards the nut axis.
The rim of the protective cap may be of hexagonal, duodecagonal or preferably circular cylindrical construction. In general, the associated depression should also be of corresponding construction. The non-detachable connection of
protective cap and nut may conveniently be
effected by an annular calking tool, whidh urges the outer ambient region of the depression form
lockingly and fluid-tightly towards the nut axis and simultaneously towards the top side of the rim.
The simultaneous pressure towards the top side of the rim is significant for disc-shaped protective
caps or pot-shaped protective caps having an outwardly projecting rim.
In the case of disc-shaped protective caps or
pot-shaped protective caps having an outwardly projecting rim the connection of protective cap
and nut is conveniently effected in that the plastically deformed ambient region of the depression is moved partly into the space above the rim of the protective cap.
According to other exemplary embodiments of the invention, the nondetachable securing of
nut and protective cap may also be effected by filling the space above the rim with casting compounds such as tin solder, hot plastics compound (particularly for plastics protective caps) etc., or by gluing. The protective cap may
consist of any desired material. For steel nuts, sheet iron, particularly sheet steel has been found
particularly convenient. Sheet steel made of
austenitic stainless steel may also be used for specific high-grade applications.
The protective cap may furthermore also consist of copper, aluminium or plastics. Plastics
may be used both for steel screws and also for plastic screws.
A particular advantage of the invention lies in
the fact that the height of the protective cap can
be adapted in simple manner to the length of the
screw-threaded bolt. This can be done by a slight
adjustment of the deep drawing tool.
The nuts according to the object of the
invention have a particularly significant use as box
wheel nuts on motor cars and lorries. In this field
especially it is particularly important to achieve
weather protection and simultaneously impact
protection for the screwthreads of the screw bolt,
because motor cars and lorries are in constant
service in all weathers, and simultaneously the
wheel nuts have to be changed comparatively
frequently.
Exemplary embodiments of the invention are illustrated in the accompanying drawing, wherein: Fig. 1 shows a standard nut with turning and protective cap before connection together,
Fig. 2 shows a detail of the connection of protective cap and nut according to Fig. 1,
Fig. 3 shows the detail according to Fig. 2 after connection,
Fig. 4 shows the detail according to Fig. 2 after another type of connection,
Fig. 5 shows another exemplary embodiment of the invention, wherein an annular recess on the head side of the nut is provided to receive the protective cap, and
Fig. 6 shows a further exemplary embodiment of the invention, in which the protective cap is of disc-shaped construction.
Fig. 1 illustrates a customary wheel nut, partly in sections. The nut 1 exhibits in the region of the screwthread 5 a cylindrical depression 6. The protective cap 2 is fitted into said depression 6. 1 The free end of the protective cap 2 exhibits an outwardly projecting rim 7. The head side of the nut is designated 4, the axis 3.
Fig. 2 shows a detail of the connection of protective cap and nut.according to Fig. 1 before connection. Here the space above the rim 7 is designated 12.
Fig. 3 shows the detail according to Fig. 2 after connections, for which an annular calking tool was placed from above onto the outer ambient region 8 of the depression 6. By the use of said calking tool, which co-operates with the outwardly bent rim 7 of the pot-shaped protective cap 2, it was unexpectedly possible to produce a steam-tight seal without the need for particular sealing measures.
Fig. 4 shows the same detail after a different type of connection. Here an annular notching tool is placed upon the ambient region 8 of the depression 6.
Fig. 5 illustrates a different type of depression 9, which is arranged annularly at the end face 4 of the nut 1. In this way it is possible to achieve a fixing of the protective cap even without influencing the screwthreaded region. Otherwise the securing is effected in the sarge manner as for the exemplary embodiment hitherto shown. The * outer ambient region of the nut 1 is designated 11 in this case.
It should be mentioned that the rim 7 need not absolutely project outwards, but may also project inwards. In this way it would be possible to show an even more closed surface towards the outside (not shown).
Fig. 6 illustrates a disc-shaped protective cap 1 3 which exhibits a rim designated 14. Said rim 14 can be integrated totally in the disc 13, so that an extremely simple production is possible.
Claims (12)
1. A nut having a protective cap which is secured nondetachably to the head side of the nut, wherein:
a) a depression is formed in the head side of the nut without inflencing the spanner attack surface thereof,
b) the protective cap is of pot-shaped or discshaped construction, and
c) the free end or the rim of the pot-shaped or disc-shaped protective cap is fitted into the depression.
2. A nut according to claim 1, wherein the depression is a cylindrical recess which is formed in the annular end face of the nut at the head side thereof and extends radially outwards from the screw-threaded inner periphery of the nut.
3. A nut according to claim 1, wherein the depression is an annular channel formed in the annular end face of the nut at the head side thereof.
4. A nut according to any of claims 1 to 3, wherein the depression is formed by turning or by
pressing.
5. A nut according to any of claims 1 to 4,
wherein the nondetachable securing of the nut
and protective cap is effected by plastic
deformation of an external wall region of the
depression at the head side of the nut, towards the
nut axis.
6. A nut according to any of claims 1 to 5,
wherein the rim of the cap is of'hexagonal or
duodecagonal form, and the associated
depression is preferably of circular cylindrical
construction, and the nondetachable connection
of the protective cap to the nut is deformed by an annular calking tool which urges an outer wall region of the depression towards the nut axis and simultaneously towards the upper side of the rim to form a fluid-tight lock therewith.
7. A nut according to any of claims 1 to 6, wherein the protective cap is of pot-shaped construction and has an outwardly projecting rim.
8. A nut according to any of claims 1 to 7, wherein a plastically deformed wall region of the depression is moved partly into the space above the rim of the protective cap.
9. A nut according to any of claims 1 to 8, protective cap is effected by filling the space above the rim with casting compound or by gluing.
10. A nut according to any of claims 1 to 9, wherein steel, sheet iron, sheet steel, particularly made of austenitic stainless steel, copper, aluminium or plastics is used as material for the protective cap.
1 A nut according to any of claims 1 to 10, wherein the height of the protective cap is adapted to the length of the screw-threaded bolt.
12. A nut according to any of claims 1 to 11, adapted for use as a box nut on motor cars and lorries.
1 3. A nut having a protective cap and substantially 6s hereinbefore described with reference to, and as illustrated in Figures 1 and 2, or Figures 1 to 3, or Figures 1, 2 and 4, or Figure 5, or Figure 6, of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3003117 | 1980-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2068492A true GB2068492A (en) | 1981-08-12 |
Family
ID=6093169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8019588A Withdrawn GB2068492A (en) | 1980-01-29 | 1980-06-16 | Nut with protective cap |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT377835B (en) |
| BR (1) | BR8004800A (en) |
| ES (1) | ES260757Y (en) |
| FR (1) | FR2474618A1 (en) |
| GB (1) | GB2068492A (en) |
| IT (1) | IT1130670B (en) |
| NL (1) | NL8003067A (en) |
| SE (1) | SE8005177L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2698420A1 (en) * | 1992-11-25 | 1994-05-27 | Profil Verbindungstechnik Gmbh | Fastening element in the form of a cap, sheet metal part comprising at least one fixing element in the form of a cap which is fixed thereto, method for manufacturing a fixing element in the form of a cap, and tool for its manufacture. |
| CN1078319C (en) * | 1998-09-09 | 2002-01-23 | 蔡清煌 | All metal pre-torque shaped bag cap |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3527506A1 (en) * | 1985-07-31 | 1987-02-12 | Richard Eyernschmalz | Insert container for video or audio storage media, especially rental container for video cassettes |
| US4875817A (en) * | 1986-07-11 | 1989-10-24 | Toyota Jidosha Kabushiki Kaisha | Sealed weld nut |
-
1980
- 1980-05-16 AT AT0264380A patent/AT377835B/en not_active IP Right Cessation
- 1980-05-27 IT IT22347/80A patent/IT1130670B/en active
- 1980-05-28 NL NL8003067A patent/NL8003067A/en not_active Application Discontinuation
- 1980-06-02 ES ES1980260757U patent/ES260757Y/en not_active Expired
- 1980-06-16 GB GB8019588A patent/GB2068492A/en not_active Withdrawn
- 1980-07-15 SE SE8005177A patent/SE8005177L/en unknown
- 1980-07-18 FR FR8015943A patent/FR2474618A1/fr not_active Withdrawn
- 1980-07-31 BR BR8004800A patent/BR8004800A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2698420A1 (en) * | 1992-11-25 | 1994-05-27 | Profil Verbindungstechnik Gmbh | Fastening element in the form of a cap, sheet metal part comprising at least one fixing element in the form of a cap which is fixed thereto, method for manufacturing a fixing element in the form of a cap, and tool for its manufacture. |
| CN1078319C (en) * | 1998-09-09 | 2002-01-23 | 蔡清煌 | All metal pre-torque shaped bag cap |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA264380A (en) | 1984-09-15 |
| ES260757U (en) | 1982-04-01 |
| IT8022347A0 (en) | 1980-05-27 |
| NL8003067A (en) | 1981-08-17 |
| FR2474618A1 (en) | 1981-07-31 |
| BR8004800A (en) | 1981-08-04 |
| AT377835B (en) | 1985-05-10 |
| SE8005177L (en) | 1981-07-30 |
| IT1130670B (en) | 1986-06-18 |
| ES260757Y (en) | 1982-11-16 |
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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) |