U.S. patent application number 10/243940 was filed with the patent office on 2003-05-15 for device for unhooking the visor from the cap of a crash-helmet, in particular for motorcycling.
Invention is credited to Gafforio, Luca, Salvetti, Alberto, Tomasoni, Gabriele.
Application Number | 20030088907 10/243940 |
Document ID | / |
Family ID | 8184691 |
Filed Date | 2003-05-15 |
United States Patent
Application |
20030088907 |
Kind Code |
A1 |
Gafforio, Luca ; et
al. |
May 15, 2003 |
Device for unhooking the visor from the cap of a crash-helmet, in
particular for motorcycling
Abstract
Device for fastening/unfastening the visor from the cap of a
helmet of the type with front opening and two side devices for
rotating the visor from an operative position of interception of
the front opening to a raised position of the visor itself,
comprising, for each rotating device, an elastic cursor fitted in
such a way that it can be turned and can slide axially in a seat in
the same rotation device. This elastic cursor, in its relative
movement with respect to the seat, can translate from an engaged to
a disengaged position with a retaining hole made in a rear end of
the visor. The device further comprises means for allowing the
axial sliding of the elastic cursor with respect to the seat
exclusively in one or more predefined angular positions assumed by
the same cursor with respect to the seat.
Inventors: |
Gafforio, Luca; (Comun
Nuovo, IT) ; Salvetti, Alberto; (Bergamo, IT)
; Tomasoni, Gabriele; (Bariano, IT) |
Correspondence
Address: |
NIXON & VANDERHYE P.C.
1100 North Glebe Road, 8th Floor
Arlington
VA
22201
US
|
Family ID: |
8184691 |
Appl. No.: |
10/243940 |
Filed: |
September 16, 2002 |
Current U.S.
Class: |
2/424 |
Current CPC
Class: |
A42B 3/222 20130101 |
Class at
Publication: |
2/424 |
International
Class: |
A42B 001/08 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 14, 2001 |
EP |
01830588.8 |
Claims
1. Device for fastening/unfastening the visor from the cap of a
helmet of the type with front opening and two side devices for
rotating the visor from an operative position of interception of
the front opening to a raised position of the visor, comprising,
for each rotating device, an elastic cursor fitted in such a way
that it can be turned and can slide axially in a seat in the same
rotation device, the elastic cursor being movable between an
engaged and a disengaged position with a retaining hole made in a
rear end of the visor, characterised in that it comprises means to
allow the axial sliding of said cursor with respect to said seat
exclusively in one or more predefined angular positions assumed by
the same cursor with respect to said seat.
2. Device according to claim 1, wherein said visor, in its
operative position, may be set in flush with the cap and wherein
each of said rotating devices comprises at least one rotating body
for turning the visor with respect to the cap and said seat is a
lifting support for moving the visor away from or towards the
cap.
3. Device according to either of the previous claims, characterised
in that said cursor rotates together with the visor.
4. Device according to claim 3, wherein said angular positions in
which the cursor can slide axially with respect to said support
coincide with the angular position assumed by the cursor when the
visor is in said raised position.
5. Device according to any one of the preceding claims,
characterised in that said means for allowing axial sliding act
through interference of parts.
6. Device according to claim 5, characterised in that said means
for allowing axial sliding comprise one or more projecting parts
integral with said cursor and a sliding surface of said seat for
said projecting parts to rest on, said sliding surface being
provided with one or more housings in which the projecting parts
can be engaged for the axial sliding of the cursor.
7. Device according to any one of the preceding claims,
characterised in that it comprises a rotating body connected to
said seat in such a way that it is free to turn.
8. Device according to claim 7, characterised in that said rotating
body comprises grooved guides within which said side end of the
visor may be inserted.
9. Device according to claim 7 or 8, wherein said rotating body is
interposed between said cursor and said seat, the cursor being
constrained to said sliding body in an axially sliding manner.
10. Device according to any one of the previous claims,
characterised in that it comprises elastic means acting on said
cursor moving away from said seat.
11. Device according to claim 9 and 10, characterised in that said
elastic means are composed of a helical spring interposed between
said cursor and said rotating body.
12. Device according to claim 7, characterised in that it comprises
a plate integral with said rotating body, said plate being provided
with at least one tooth that can engage removably in corresponding
grooves or holes present in said seat.
Description
[0001] The present invention refers to a device for fastening or
unfastening (unhooking) the visor from the cap (shell) of a helmet
for motorcycling or for other sports use of the type comprising a
front opening and two side devices for rotating the visor with
respect to the front opening. In motorcycle helmets, and
particularly in crash-helmets (or full helmets) in which the cap
completely protects the user's head apart from a front opening over
the nose and eyes, it is common practice to provide a pair of side
devices for rotating the visor to which are respectively fixed the
rear ends of the visor itself, so that it can rotate from a
position where it intercepts the front opening to a raised
position. These rotating devices usually present a support integral
with the cap, which may be simply a seat created in the cap itself
or a structural detail connected to it, on which the visor is
hinged and fixed by means of mechanical catches of various
kinds.
[0002] To unfasten the visor from the helmet rotating devices in
order to clean it or, in case of wear or scratching, to replace it
with a new one, these mechanical catches must be expressly
deactivated by the user by means of suitable tools.
[0003] However this solution, while guaranteeing considerable
simplicity and economy, is not very practical in situations where
the user does not have the suitable tool to deactivate the
mechanical catch or when the visor has to be replaced quickly, for
example during competitive use.
[0004] In the application for a French patent FR 2.785.505 A1 in
the name of SHARK S. A., it has been proposed to make a hole of
suitable dimensions in each of the two rear ends of the visor and
to engage these holes on pins protruding laterally from opposite
parts of the cap. In turn, each pin presents retractable transverse
catches, in particular spheres which, depending on their position,
block or release the visor with respect to the pin. These catches
are controlled by an elastic button which, when pressed, causes
retraction of the catches and release of the visor.
[0005] This solution does not require the use of specific tools and
seems to be able to allow a considerable speed in the manoeuvres to
be performed to unfasten the visor, but the mechanism adopted is
structurally complex, thus entailing a possible unreliability of
the device, a certain difficulty in production and poor economy.
Moreover the SHARK device enables the visor to be unfastened even
when it is in its normal position of use, that is when it
intercepts the front opening of the helmet. In fact, the mechanism
is not provided with safety blocks which, with the visor in closed
position, would prevent the elastic button from being shifted for
any reason, determining the consequent retraction of the spherical
catches and the subsequent possible release of the visor.
[0006] In the most modern crash-helmets, the rotating visor, in its
normal using position where it intercepts the front opening of the
helmet, is set in so that it is flush with the helmet itself. This
precaution, as well as being aesthetically pleasing, has proved to
be particularly useful for obtaining an efficient aerodynamic
configuration of the helmet and thus favouring the forward movement
of the rider in the air at high speeds and reducing the
corresponding aerodynamic rustling.
[0007] In these last realisations, to allow the visor to assume the
inset position protecting the helmet opening and the raised
position in which the visor is turned away from the cap and rotated
so as not to intercept the opening, the rotation devices on the
sides of the helmet contemplate both a lifting support which,
connected to the visor, may be manoeuvred by the user so that it
lifts with respect to the cap, moving the visor away from the same,
and a rotating body integral with the visor and constrained in
rotation to the lifting support.
[0008] When the user wants to lift the visor, allowing the air flow
to enter the opening, he must extract the visor, thanks to the
lifting support, and then rotate it, together with the rotating
body, with respect to the cap.
[0009] In this type of helmet too it is frequently necessary to
unfasten the visor from the rotating device in order to clean it or
replace it with a new one if it is worn or scratched.
[0010] For this purpose it is common practice to provide, for each
rotating device, a visor release device composed of a button, or
cursor, sliding axially with respect to the support and fitting
into a corresponding retaining hole situated in a rear end of the
visor. Each button is engaged in the hole in the visor by an
elastic element, such as a flat spring, and it may be pressed by
the user so as to release it from the hole in the visor and thus
free the visor from the rotating device.
[0011] More particularly, in recent realisations of the prior art,
each rear end of the visor, engaging in each rotating device,
slides on guides provided on a rotating body, secured in turn in a
rotating manner on the support, and is held in the guides,
preventing free sliding, by the engaging of the elastic button in
the hole in the end of the visor. The button, as described above,
is made elastic by a suitable elastic flat spring which, connected
to the same button and bent when the latter is pressed, is deformed
in such a way as to allow the button to translate by a sufficient
distance to be released from the helmet. Moreover, in these devices
the button can move (translate) with respect to the flat spring in
a direction parallel to that of the guides in which the visor
slides so as to allow optimum regulation of the positioning of the
visor with respect to the cap. When the visor is in the normal
using position in which it intercepts the front opening of the
helmet and is inset so as to be flush with the cap, the button and
its elastic element cannot be deformed by bending to such an extent
as to allow the release of the visor thanks to the presence, in the
mechanism itself and in the side rotating and lifting devices
connected to it, of suitable rests, strikers and interposed parts
which limit the effects of any pressure exerted, for any cause, on
the button. Such a mechanism is described, for example, in the
application for a patent EP 1.057.418 A1 in the name of OPTICOS
S.r.I.
[0012] So, to unfasten the visor, the user must first open the
visor by activating the lifting system which, moving away from the
side areas of the cap, causes the release of the safety blocks that
control the elastic element; then press the two buttons that engage
the holes in the ends of the visor itself to as to release the
latter from the rotation devices and subsequently free it from the
guides provided in the rotating body.
[0013] The unfastening device described above is extremely rapid to
operate and ensures that in the normal using position of the visor,
that is when it is intercepting the front opening of the helmet,
the visor cannot be released, but its structure is very complex so
it is not simple to make. Moreover, the force needed to cause the
necessary bending of the flat spring and the extent of the spring
deformation are variable according to the position of the button
with respect to the spring, which means that there is a certain
heterogeneity in the response of the unfastening device and it is
necessary for this device to be oversized in order to prevent
certain relative positions of the button with respect to the flat
spring from causing axial sliding of the button which is
insufficient to free the visor from the same device.
[0014] An aim of the present invention is to provide a device for
unfastening the visor from the cap of a full helmet (or
crash-helmet) which does not present the inconvenient aspects of
the prior art and which is therefore extremely rapid to operate
and, at the same time, particularly reliable.
[0015] Another aim of the present invention is to provide a device
for unfastening the visor which does not allow the visor to be
unfastened when it is intercepting the front opening of the helmet
during use, and which is particularly efficient while being
structurally simple.
[0016] These and other aims are achieved by the device in the
present invention, as claimed in the first independent claim and in
the subsequent dependent claims.
[0017] According to the present invention, the device for
fastening/unfastening the visor from the cap of a helmet of the
type with front opening and two side devices for rotating the visor
from an operative position of interception of the front opening to
a raised position of the visor itself comprises, for each rotating
device, an elastic cursor fitted in such a way that it can be
turned and can slide axially in a seat in the same rotation device.
This elastic cursor, in its relative movement with respect to the
seat, can move from an engaged to a disengaged position with a
retaining hole made in a rear end of the visor. The device further
comprises means for allowing the axial sliding of the elastic
cursor with respect to the seat exclusively in one or more
predefined angular positions assumed by the same cursor with
respect to the seat. Preferably these means for allowing sliding of
the cursor act by interposition of parts.
[0018] The elastic cursor of the device for fastening and
unfastening the helmet, according to a preferred aspect of the
present invention, can rotate together with the visor and the
angular positions in which the cursor can slide axially with
respect to the seat of the rotating device coincide with the
angular position assumed by the cursor when the visor is in a
raised position.
[0019] According to a particular aspect of the present invention,
the cursor comprises projecting parts which, during its rotation
with respect to the seat, rest and slide on a surface of the
support itself. This sliding surface comprises housings in which
these projecting parts can be engaged to allow the traverse
movement of the cursor with respect to the seat of the rotating
device.
[0020] According to another aspect of the present invention, the
cursor is rendered elastic by a helical spring inserted operatively
between the abovementioned seat and the cursor itself.
[0021] A preferred embodiment of the present invention will now be
illustrated, purely as an example without limitation, with the aid
of the enclosed figures, in which:
[0022] FIGS. 1a, 1b are schematic side views of a crash-helmet of
the type in which the visor may be set in flush with the cap, on
which it is possible to fit a device according to the present
invention;
[0023] FIG. 2 is an exploded view of a rotating device comprising a
device for unfastening the visor of a full helmet in a preferential
embodiment of the present invention;
[0024] FIG. 3 is a top plan view of a lifting support of the
embodiment in FIG. 2;
[0025] FIG. 4 is a top plan view of a rotating body of the
embodiment illustrated in FIG. 2;
[0026] FIG. 6 is a side section view of an intermediate plate of
the embodiment in FIG. 2;
[0027] FIG. 7 is a side section view of the rotating device and of
the visor unfastening device assembled and in a position in which
the visor is raised with respect to the cap of the helmet;
[0028] FIG. 8 is a top plan view of the embodiment in FIG. 7.
[0029] FIGS. 1a, 1b show two side views, respectively with the
visor raised and with the visor closed, of a crash-helmet 101 of
the type in which the visor 105 intercepts the front opening 106 of
the helmet 101 in an inset position flush with the cap 107. The
helmet 101 presents laterally, on opposite sides, two devices 102
suited for engaging with the rear ends 103 of the visor 105.
[0030] FIG. 2 illustrates, in an exploded view, a device 102 for
rotating the visor 105 which may be applied on a full helmet of the
type shown FIGS. 1a and 1b. In these helmets, when the visor 105 is
in its inset position intercepting the front opening 106 (FIG. 1b)
and the user wants to turn it, the rotating devices 102 situated on
the sides of the cap 107 must first move the visor 105 away from
the cap itself, so that the visor 105 is no longer embedded in the
opening 106 of the helmet, and only later allow the rotation of the
visor 105 into a raised position (FIG. 1a).
[0031] For this purpose, the rotating device in FIG. 2 comprises an
assembly 2 for lifting and moving forward the visor 105 and a
rotating body 4, constrained to the assembly 2 so as to be able to
turn in relation to the latter, on which is connected the rear end
103 of the visor 105.
[0032] More particularly, the assembly 2 is composed of a base 22,
fixed firmly to the cap 107, and of elastic means 23 suited for
retaining the visor in two stable positions, as well as a lifting
support 1, connected to the visor 105, which allows it to be
extracted from the opening 106 and lifted with respect to the cap
107.
[0033] The support 1 is provided with bottom surfaces coupled in a
sliding manner to sloping slides, of a wedge shape, with their
higher portion facing towards the front of the helmet, present on
the base 22, and it is retained in a position of stable equilibrium
by the means 23. The relative sliding of the lifting support 1 with
respect to the base 22 on the slides determines the moving of the
visor 105 away from the cap 107 in a lateral direction and forward
in a longitudinal direction. Moreover, the means 23 allow the
support 1 to remain in a stable position whether it is raised or
close to the base 22. This solution for the extraction of the visor
105, described briefly above, is the object of an application for a
patent deposited at the same time by the Applicant and is not a
part of the present invention.
[0034] In the embodiment in FIG. 2, moreover, the rotating body 4
is coupled to the support 1 by means of a bush 7 and a rivet 8
which define the axis of rotation around which said body 4 is free
to turn with respect to the support 1. The body 4 is also secured
to one of the rear ends 103 of the visor 105 and rotates together
with said visor 105. The device illustrated therefore allows the
visor 105 to be extracted, moving it away from the front opening
106 and forward with respect to the cap 107, thanks to the lifting
support 1, and then turned, thanks to the rotating body 4.
[0035] The device illustrated also comprises an elastic cursor 3,
fitted in an elastic fashion, sliding and turning on the body 4, an
intermediate plate 6, the function of which will be described
below, and a helical spring 5 inserted between the plate 6 and the
cursor 3. The cursor 3, the spring 5 and the support 1 are part of
the device for fastening/unfastening the visor in the present
invention.
[0036] More generally, the device according to the present
invention comprises a support 1 for the rotating device, which may
be simply a fixed seat made in the cap 107, to which is connected,
in such a way as to be able to turn and slide relatively, an
elastic cursor 3 suited for engaging in a corresponding retaining
hole 104 located in the rear end 103 of the visor 105. The elastic
cursor 3, in its axial movement with respect to the support 1, is
also able to translate axially from a raised position, in which it
is engaged in the hole 104 in the visor 105, to a lowered position,
in which it is disengaged from the hole 104, only when
corresponding to predefined angular positions reached by the same
cursor 3 with respect to the support 1. For this purpose means are
provided, preferably of the type with interfering parts, suited for
allowing sliding of the cursor 3 with respect to the support 1
exclusively in these predefined angular positions.
[0037] Preferably, the cursor 3 rotates together with the visor 105
and the angular positions in which the cursor 3 can slide with
respect to the support 1 to free the visor 105, disengaging from
the hole 104, correspond to the above-mentioned raised position of
the same visor 105 (FIG. 1a).
[0038] It must be observed that the device in the present
invention, as it will be clear to a technician of the sector,
cannot be applied only to the extraction assembly 2 described
above, but may also be generally used with visor extraction
mechanisms of the prior art (for example the one described in the
application for a patent EP 1.057.419-A1 in the name of OPTICOS
S.r.I.) or even with helmets in which the visor is not inset and
therefore said extraction assembly 2 is not present. In the latter
case, the support 1 and the base 22 coincide and the rotating body
4 can therefore rotate with respect to the cap 107.
[0039] Now with reference to the FIGS. 3-8, the preferred
realisation of the present invention illustrated in FIG. 2 will be
described in detail.
[0040] FIG. 3 shows a support 1, according to a preferred aspect of
the present invention, which comprises a base surface 11 surrounded
by a frame 9 within which the rotating body 4 may be engaged in
rotation, and a hole 13 in which is inserted, for assembly, the
rivet 8. The surface 11 presents a plurality of grooves or holes 12
and the frame 9 is provided with two slots 10a, 10b, diametrically
opposite each other, which constitute interruptions in the same
frame 9.
[0041] The rotating body 4, with reference in particular to FIG. 4,
comprises a lower cylindrical portion, or cup, suited for engaging
with the support 1 and provided with a hole 17 for engaging with
the bush 7 and the rivet 8, two through openings 15a, 15b
diametrically opposite and other two openings 16a, 16b offset at a
90.degree. angle with respect to the first ones. The upper portion
of the body 4 is also provided with two parallel guides 18a, 18b
within which may be inserted, by sliding, the rear end portion 103
of the visor 105.
[0042] The bush 7 and the rivet 8 perform the function of a hinge
for the body 4 with respect to the support 1 and may obviously be
substituted with any other constraint able to hold together the
body 4 and the support 1 in a relatively rotating manner.
[0043] The elastic cursor 3 comprises
[0044] is shaped in order to engage by catching in the retaining
hole 104 in the rear end 103 in the visor 105. The cursor 3 is kept
away from the rotating body 4, and therefore from the support 1,
thanks to the helical spring 5 which exerts a pushing action on the
internal surface of the cursor 3 and on the intermediate plate
6.
[0045] During use, therefore, the visor 105 is inserted in a
removable fashion between the guides 18a, 18b, arranged on a plane
at a right angle to the axis of rotation of the body 4, which allow
the integral rotation of the visor 105 with the same body 4, and it
is kept integral with the entire rotating device by the engaging of
the elastic cursor 3 in the hole 104 thanks to the pushing action
of the spring 5.
[0046] The projecting parts the cursor 3 engage in the through
openings aperture 15a, 15b of the rotating body 4 and are shaped so
that they guarantee that the same cursor 3 can rotate together with
the body 4 and at the same time can travel with respect to the
latter, in a direction coinciding with the axis of rotation, for a
stroke of a given length.
[0047] The location of the housings 10a, 10b, as already mentioned,
is such that it is only when the visor 105 is in the raised
position shown in FIG. 1a, and therefore when the body 4 and the
cursor 3 assume the corresponding angular position with respect to
the lifting support 1, that the projecting parts are arranged
corresponding to the same housings 10a, 10b. In this configuration
it is therefore possible to exert pressure on the same cursor 3 to
provoke its movement towards the support 1, overcoming the
resistance of the spring 5. This movement has a sufficient stroke
to free the hole 104 in the visor 105 from the same cursor 3 and
thus allow sliding of the rear end 103 of the visor 105, which is
no longer held back by the cursor, within the guides 18a, 18b of
the rotating body 4.
[0048] It must be observed that, in a more essential embodiment of
the present invention, which is not illustrated, the device for
rotating the visor 105 might not present the rotating body 4 and
the visor might only be held back by the cursor 3 in an integral
manner with it, without being moved away from the object of the
present invention. In this essential embodiment, the cursor 3 could
be directly constrained, in rotation and in axial movement, to the
support 1.
[0049] FIG. 6 shows a side section of the intermediate plate 6
which, in the embodiment illustrated, rests on the bottom surface
of the cylindrical portion of the rotating body 4 while the spring
5 rests on the plate 6. The plate 6 comprises a central hole 20 and
is provided with two teeth 21a, 21b which are inserted in the
openings 16a, 16b of the body 4 and, passing through the rear wall
of the latter, engage in the grooves or holes 12 provided on the
surface 11 of the support 1.
[0050] The plate 6 is therefore integral with the body 4, thanks to
the insertion of the teeth 21a, 21b in the openings 16a, 16b, and
is elastically held in position by the helical spring 5.
[0051] The function of the teeth 21a, 21b which engage in the
grooves 12 is to provide predefined angular positions which are
substantially stable for rotating the visor. This plate 6 and the
corresponding grooves 12 may be omitted without this structurally
or functionally influencing the device of the present
invention.
[0052] A general view in side section of the device in FIG. 2
assembled and in a position in which the lifting support is in a
raised position and the cursor 3 is held back by the spring 5 is
illustrated in FIGS. 7 and 8 (for the sake of clarity the visor is
not shown).
[0053] To unfasten the visor 105 from the rotating device
illustrated, therefore, the user must first extract the visor 105
from the front opening 106 and at the same time move it away from
the cap 107, then rotate it in a raised position and afterwards
unfasten it.
[0054] In fact it is not possible, in the full helmet 101
illustrated, to turn the visor 105 before it is extracted from the
front opening 106, because of the interference of parts between the
visor 105 and the cap 107, due to the inset position flush with the
cap 107 which the visor 105 itself assumes when it is set to
intercept the front opening 106.
[0055] The preliminary operation of extracting and rotating the
visor thus contemplates that the user, if necessary using suitable
means not illustrated for pushing the visor 105, should first
provoke the raising and advance of the lifting support 1 with
respect to the base 22 and then the rotation of the visor 105 with
respect to the cap 107 and, consequently, the rotation of the
rotating body 4 and of the retaining cursor 3 with respect to the
support 1 in a raised position. Due to the interference between the
teeth 21a, 21b of the plate 6 and the grooves 12 of the support 1,
interference maintained thanks to the pushing action of the spring
5, the visor 105 can be lifted in steps in stable angular
positions, identified by the geometric arrangement of the same
grooves 12.
[0056] During the rotation of the visor 105, the projecting parts
slide on the top surface of the frame 9, resting on it and thus
preventing, in the intermediate positions assumed during the
rotation of the cursor 3 with respect to the support 1, the
possible occurrence for any reason of an axial movement of the same
cursor 3 towards the support 1. Once the visor 105 has reached the
completely raised position, on the other hand, the angular position
of the projecting parts with respect to the support 1 coincides
with the location in which the housings 10a, 10b have been made in
the frame 9 and so the bottom ends of the projecting parts are no
longer resting on the frame 9. So, in this position, any pressure
of the cursor 3 that overcomes the resistance of the helical spring
5 determines its axial sliding approaching the support 1 and its
disengagement from the retaining hole 104 in the rear end 103 of
the visor 105. With the cursor 3 pressed it is therefore possible
to move the visor 105 away from the rotating device, making it
slide out of the guides 18a, 18b of the rotating body 4.
[0057] This operation, repeated for both the lateral rotating
devices on the helmet 101, allows the rapid release of the visor
105 from the same helmet 101 and its possible substitution. The
impossibility of unfastening the helmet in positions other than
that of normal use in which it intercepts the front opening of the
helmet is entrusted to the fact that only in the raised position of
the visor 105 (FIG. 1a) can the cursor 3 be pressed to release
(unhook) the visor 105.
[0058] The fastening of a new visor to the rotating devices of the
type illustrated in the figures is performed by repeating the
above-mentioned unfastening operations in reverse order and so, for
each lateral device 102 of the helmet 101, it may be achieved by
keeping the rotating body 4 in the visor unfastening position and
inserting, while holding down the cursor 3, the rear end 103 of the
new visor in the guides 18a, 18b of the rotating body 4, until the
hole 104 corresponds to the cursor 3. At this point, to secure the
visor it is sufficient to release the cursor 3 which, pushed by the
spring 5, engages with the hole 104 and thus prevents sliding of
the visor 105 in the guides 18a, 18b.
[0059] The device illustrated above, as will be clear to an expert
in the field, may be simply adapted to rotating devices which do
not contemplate the prior extraction of the visor and moreover, in
a possible embodiment, the rotation of the cursor 3 may be
independent of the rotation of the visor itself.
[0060] From the above description it is clear that the new device
for fastening and unfastening the visor from the cap of a helmet is
particularly effective, considering the high speed of operation of
each cursor 3, structurally simple and at the same time able to
prevent the unfastening of the visor 105 when, during normal use of
the helmet, the visor 105 is in the position of interception of the
front opening 106.
* * * * *