[0001] This invention relates to protective helmets, which are used by, for example, motor
cyclists and pedal cyclists, scooter riders and moped riders, and which are of a type
provided with chin straps in order that the helmet may be held securely to the user's
head. The most commonly known protective helmet for motor cyclists have chin straps
which are secured by means of metallic pins or iron plates which plates in turn are
rivotted to the inside of the helmet shell.
[0002] There are known other fixing arrangements in protective helmets, but invariably these
arrangements include metallic connecting parts.
[0003] When metallic parts are used, it frequently happens that due to the action of inclement
weather or because of perspiration of the user, the metallic parts become oxidised,
and if made or iron or steel rusting, which on the one hand makes them unsightly,
and on the other hand and more seriously weakens them to such an extent that they
may fail in use when subject to stress which could be extremely dangerous in the case
of impacts and accidents.
[0004] The present invention seeks to provide a helmet, the helmet shell, and a method of
making a helmet shell whereby the utilisation of metallic parts for the fixing of
the chin strap of the helmet is obviated thereby avoiding the abovementioned drawbacks.
[0005] In accordance with the present invention, in a first aspect, a protective helmet
comprising a head protecting shell of non-metallic material having chin strap mountings
at respective sides thereof, and a chin strap, is characterised in that at least one
of said mountings includes a support of non-metallic material which is integral with
the shell and a non-metallic complimentary locking member which co-operates with the
support thereby to lock the chin strap to the shell, whereby the use of rivets, screws,
studs or other metallic parts is not necessary.
[0006] Also in accordance with the invention, there is provided a head protecting shell
of a protective helmet as aforesaid, wherein the shell is of non-metallic material
and has chin strap mountings at the respective sides thereof, said shell being characterised
in that at least one of said mountings comprises a support stamped out from or moulded
with the shell.
[0007] In yet another aspect of the invention there is provided a method of making a protective
shell of a protective helmet provided with supports for a chin strap at respective
sides of the shell, wherein the shell is formed in non-metallic material and at least
one of said supports is stamped from or moulded with the said shell.
[0008] The shell of the helmet may be made of stampable themoplastic synthetic resin or
of polyester resin reinforced with glass fibres, and the said support may be formed
by stamping or mechanical moulding, and may comprise a bridge which is ipported spaced
inwardly of the inner surface of the shell by bridge legs at the end of the bridge,
so as to define a bridge slot through which an end loop of the chin strap passes,
said complimentary part in such case comprising a locking pin which is of greater
diameter than the width of the said slot and which passes through said loop of the
chin strap, said locking pin being of synthetic plastics material.
[0009] The said locking pin may be provided with two resilient locking legs provided with
projections which are adapted to spring into locking engagement with recesses or ledges
in the bridge legs, thereby to prevent the movement of the locking pin upwards relative
to the bridge.
[0010] With the formation of each bridge there may be formed an aperture in the outside
of the shell, and such aperture is preferably covered by means of a cover plate which
is provided with resilient projections which serve resiliently to lock the cover plate
in position covering said aperture.
[0011] An embodiment of the present invention will now be described, by way of example,
with reference to the accompanying drawings, whererein:-
Fig. 1 is a view of one side of the inside of the helmet shell, showing the integral
support at that side, a similar support being provided at the other side;
Fig. 2 shows the support shown in Fig. 1 when viewed from the outside of the helmet;
Fig. 3 is a cross-section taken through the support shown in Figs. 1 and 2;
Fig. 4 is a view similar to Fig. 1, but showing the locking pin in operative position;
Fig. 5 is a'side view of the locking pin shown in Fig. 4;
Fig. 6 is a plan view of an outer cover plate;
Fig. 7 is a cross-sectional view of a cover plate shown in Fig. 6 ; and
Fig. 8 is a cross-section similar to Fig. 3, but showing the complete assembly, and
the loop end of the chin strap held by the assembly, and the cover plate applied.
[0012] Referring to the various figures, it is to be mentioned that the helmet shell 1 is
provided with two chin strap mountings, one at each side and one only of which is
described, and the said shell is made in this example of stampable elastic synthetic
resin (it may be of polyester resin reinforced with glass fibres), and has formed
by stamping or mechanical moulding on each side a locking bridge 2 which is spaced
from the inside of the helmet by means of bridge legs at the ends of bridge 2, so
as to define a slot or loop hole 3,4 to receive the looped end of the chin strap 5.
The looped end may be formed by folding the end of the strap and sewing the folded
end to the remainder. The looped end is indicated by numeral 5' in Fig. 8. Received
in the looped end 5' is a locking pin 6, which is also made of synthetic resinous
material and terminates in two resilient legs 7 and 8 as shown in Figs. 4 and 5, which
are provided with projections 7' and 8' which are resiliently received in the recesses
2 and 2" of the bridge 2, to prevent the movement of the pin 6, and therefore the
loop 5', upwards in use.
[0013] The diameter of the pin 6 is greater than the width of the slot 3 of the bridge,
to prevent the loop 5' from slipping through the slot 3,4.
[0014] Each mounting is provided with a cover plate 9 which is also of synthetic plastics
material, and is provided with resilient projections 9 and 9", which serve to hold
the cover in the opening 3', as shown in Fig. 2, to cover said opening. The opening
3' occurs with the stamping out of the bridge 2.
[0015] It will be clear that in the arrangement described there are no metallic parts, and
therefore oxidation, corrosion and wear of parts due to oxidation and corrosion are
excluded absolutely, ensuring the long term efficiency of the strap attachments.
[0016] The shape of the various parts making up each of the mountings or attachments for
the strap may vary without departing from the scope of protection as defined in the
appended claims.
1. A protective helmet comprising a head protecting shell of non-metallic material
having chin strap mountings at respective sides thereof and a chin strap, characterised
in that at least one of said mountings includes a support (2) integral with the shell
(1), and a locking member (6) which is also of non-metallic material and which co-operates
with the support (2), thereby to lock the chin strap (5), to the shell (10), whereby
the use of rivots, screws, studs, or other metallic parts is not necessary.
2. A helmet according to claim 1, characterised in that the the support (2) comprises
a bridge (2) supported spaced inwardly of the inner surface of the shell by bridge
legs at the end of the bridge (2) so as to define a bridge slot (3) through which
an end loop (5') of the chin strap (5) passes, said complimentary part (6) comprising
a locking pin (6) which is greater in diameter than the width of said slot (3,4) and
which passes through the said loop (5') of the chin strap.
3. A helmet according to claim 2, characterised in that the locking pin (6) has resilient
locking legs (7,8), which respectively resiliently lock to the bridge legs to prevent
the locking pin (6) in use from moving upwardly relative to the bridge (2).
4. A helmet according to claim 1, 2 or 3, characterised in that the said support (2)
is stamped out from or moulded with the protective shell (1).
5. A helmet according to claim 4, characterised in that an aperture (3') is formed
in the shell (1) by the formation of the bridge (2), and a cover (9) of synthetic
plastics material has resilient projections (91,911), by which the cover plate is
sprung into position from the outside of the shell, so as to cover said aperture (3').
6. A helmet according to any preceding claim, characterised in that the chin strap
mountings (2,6) at the respective sides of the shell (1) are identical.
7. A helmet according to any one of the preceding claims, characterised in that the
shell (1) and integral support (2) or supports (2) are of stampable synthetic resin.
8. A helmet according to any of claims 1 to 6, characterised in that the shell (1)
and integral support (2) or supports (2) are of polyester resin reinforced with glass
fibre.
9. A head protecting shell for a protective helmet as claimed in claim 1, wherein
the shell is of synthetic plastics material, and has chin strap mountings at respective
sides thereof, characterised in that at least one of said mountings comprises a support
(2) stamped from or moulded with the shell (1).
10. A protective shell according to claim 9, characterised in that the shell (1) and
integral support (2) or supports (2) are of stampable synthetic resin.
11. A shell according to claim 9, characterised in that the shell (1) and integral
support (2) or supports (2) are of polyester resin reinforced with glass fibre.
12. A method of making a protective shell for a protective helmet provided with a
support for a chin strap at respective sides of the shell, characterised in that the
shell is formed in non-metallic material and at least one of said supports is formed
integrally with said shell.
13. A method according to claim 12, wherein the shell and integral support or supports
are of stampable synthetic resin.
14. A helmet acccording to claim 12, characterised in that the shell and integral
support or supports are of polyester resin reinforced with glass fibre.