HELMET WITH DETACHABLE FRONT SECTION

Abstract: A helmet, particularly an aircrew helmet, has a rear part (10) and a front part (12). The rear part (10) comprises a shell shaped to extend partially over the top of the wearer's head and to each side of the head. The front part (12) is shaped to fit against the rear part (10) to complete the shell of the helmet, and is detachably connected to the rear part. The front part (12) is shaped to accommodate equipment for optical protection or enhancement, such as a visor or night vision goggles. A single helmet may have two or more interchangable front parts with different optical equipment. The front part (12) may be connected to the rear part (10) by releasable catches (50, 54) at the top and sides of the helmet. The catch (50) at the top may allow the front part (12) to pivot upwards to enable the helmet to be donned and doffed without detaching the front part.

Description: This invention relates to helmets. More particularly, but not exclusively, the invention relates to aircrew helmets. Pilots of military aircraft can nowadays be supplied with a range of equipment providing optical aids, such as night vision goggles, position sensing systems or helmet-mounted sights, or providing optical protection, such as tinted visors, or filters providing protection against lasers or nuclear flash. It would be advantageous for such equipment to be accommodated at least partially within the helmet. However, this gives rise to the problems that it is impossible to mount all the equipment in a single helmet, and that the helmet would have to be adapted in different ways to accommodate different equipment. Patent specification FR-A-2339353 describes a helmet, particularly for motorcyclists, comprising a shell with an integral chin portion and a separately formed cover which fits over a front portion of the shell to define a space into which a visor can be retracted. The cover is fixed to the shell at two points, one on either side of the shell, and is held in place on each side by a screw which passes through a washer engaging the inner face of the shell and is screwed into a boss formed in the inner face of the cover. The bosses also serve as pivots for the visor. Each screw has a coin slot which enables the cover to be removed, to enable the visor to be fixed or removed or a new cover fitted, without requiring a special tool. Patent specification US-A-4075715 describes an aircrew helmet having a shell and a visor housing which fits over a front portion of the shell. The housing is spaced from the shell by spacers to define a gap to receive the visor. The spacers also form tracks along which the visor moves between lowered and raised positions. The visor housing and spacers are fixed to the helmet shell by screws. Neither of these documents provides a solution to the problem mentioned above. It is an object of this invention to provide a versatile helmet. This invention consists in a helmet having a rear part and a detachable front part, the rear part comprising a shell shaped to extend at least partially over the top of the wearer's head and to each side of the head, the front part being shaped to fit against the rear part to complete the shell of the helmet, connection means for detachably connecting the front part to the rear part, the front part being shaped to accomodate equipment for optical enhancement or protection, characterised in that a helmet having a rear part and a detachable front part, the rear part comprising a shell shaped to extend at least partially over the top of the wearer's head and to each side of the head, the front part being shaped to fit against the rear part to complete the shell of the helmet, connection means for detachably connecting the front part to the rear part, and optical equipment mounted on the helmet, characterised in that the helmet is provided with a single rear part, and two or more interchangeable front parts each accommodating a different piece of optical equipment and each shaped to fit against the common rear part. Preferably, at least one front part of the helmet is shaped to accommodate the equipment so that the equipment is at least partially enclosed by the helmet. The front and rear parts of the helmet may be provided with complementary facing surfaces which engage one another when the parts are connected together. The means for connecting the front and rear parts together may include hinge means connecting the two parts so that the front part can be pivoted upwards from the closed position to enable the helmet to be donned and doffed. The invention is particularly advantageous when applied to aircrew helmets. The rear part of the aircrew helmet may contain the ear capsules and associated headset enabling voice communication with the wearer. Where the optical equipment mounted in the front part of the helmet requires electrical connections to other equipment or to a source of electricity, the connections may be made to the rear part of the helmet through electrical contacts incorporated in the connection means between the front and rear parts. The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a helmet in accordance with the invention; Figure 2 is a perspective view of the rear part of the helmet; Figure 3 is a side view of the rear part; Figure 4 is a perspective view of the front part of the helmet; Figure 5 is a rear perspective view of the front part of the helmet; Figure 6 is a side view of the helmet, partly in section; Figure 7 is a front view of a helmet in accordance with another embodiment of the invention, fitted with night vision goggles; and Figure 8 is a side view of the helmet of Figure 7. Referring to the drawings, an aircrew helmet in accordance with the invention comprises a rear part 10 and a front part 12. The rear part 10 has an outer shell 14 which extends in use around the back and over the top of the wearer's head, and part way along each side of the head. The shell 14 is shaped so that the forward portion 16 of the shell is offset closer to the wearer's head than the remainder of the shell. The forward position 16 is joined to the rear portion 18 of the shell through a forwardly facing portion 22 and to each of the side portions 20 through a forwardly facing portion 24. At their front edges, the side portions 20 are turned in to form flanges providing forwardly facing surfaces 26. The rear part 10 also has a shock-attenuating liner 28, for example manufactured from foam plastics. A neck pad (not shown) may be provided for fit adjustment. Ear capsules 30, adapted to support a headset for voice communication with the wearer, are suspended from the inner faces of the side portion 20 of the outer shell 14. The ear capsules and associated equipment are of conventional construction and will not be described further. The front part 12 of the helmet has an outer shell 32 with a portion 34 which in use extends over the forward portion 16 of the rear part 10 of the helmet, and side portions 36 which extend in front of the side portion 20 of the rear part 12. At its rear edges the shell 32 is turned inwards to form a flange 38 which is shaped to fit against the surfaces 22, 24 and 26 of the rear part 10. The front and rear parts 10 and 12 are releasably held together by catches 50 and 54. Catch 50 at the top of the helmet consists of a hook 51 fixed to the rear part 10 and a rod fixed by a bracket to the front part 12. The rod engages the hook so that the front part 12 can pivot upwards, to allow the helmet to be donned and doffed, without detaching the front part 12 from the rear part 10. The front part 12 can be detached by lifting the rod 52 from the hook 51. To hold the front part 12 in the closed position, releasable catches 54 are provided at each side of the helmet. Each catch 54 consists of a head 55 fixed to the front part 12 and positioned to engage in a spring-loaded latch device 56 fixed to the rear part 10. The latch device 56 has release levers 57 operable to release the head 55. The device may be of the same form as that described in United States patent 4 648 138 entitled "Retention and quick release mechanism", the contents of which are incorporated herein by reference. Alternatively, other suitable catch mechanisms could be used. When the two parts 10 and 12 of the helmet are fitted together, the offset portion 16 of the rear part 10 and the portion 34 of the front part 12 define between them a gap 39 (Figure 6) which provides a space to receive a rotatable sun-glare visor 40 mounted in the front part 12. The visor 40 is carried by two arms 42 which are mounted inside the shell 32, on pivot pins 44. The pivot pins 44 are on portions 35 of the shell which project rearwardly from the flange 38 and lie outside the shell 14 of the rear part 10. One of the arms 42 has a part 46 projecting outwards to provide an operating lever by means of which the visor 40 can be moved between an operative position and a retracted position in which it is housed in the space 39 between the portion 16 and 34 of the front and rear parts of the helmet. The visor could alternatively be provided with an operating mechanism as described in published European patent application EP-A-0270368. The visor 40 is thus accommodated within the detachable front part of the housing. The front part of the housing could be adapted to accommodate other optical enhancement or protection equipment, such as night vision goggles or other protective visor equipment such as laser or blast screens. The helmet could be supplied with a single rear part, and two or more interchangeable front parts, for example with one front part as shown housing a sun-glare visor and another housing night vision goggles or other equipment. The helmet can be provided with attachments to hold an oxygen mask, the attachments being fixed either to the rear part or the front part of the helmet. The attachments could, for example, be as described in the above mentioned United State patent 4648138. It will be appreciated that modifications could be made in the described embodiment. For example, more than one visor could be accommodated within the front part of the helmet. A sun-glare visor and a blast visor could be provided, mounted as described in the above mentioned EP-A-0270368. Where a single visor is fitted, there will normally be sufficient space left within the front part of the helmet to accommodate adjacent to the shell a shock-absorbing liner to provide additional protection above that of the rear part of the helmet. The helmet shown in Figures 7 and 8 has a rear part 110 and a detachable front part 112. The front part 112 is fitted with a conventional visor 113 and also has a second visor 140 accommodated within the front part 112 as in the embodiment of Figures 1 to 5. This visor 140 may for example be a protective screen against air blast and bird strike debris, or a visor giving protection against glare or laser light. Also mounted on the front part 112 of the helmet is a night vision goggles attachment 150. The attachment 150 is fitted to the front part 112 by means of a bracket 152, so that the goggles 154 can be moved to a position in front of the wearer's eyes. The night vision goggles may be of conventional construction. The front part 112 and rear part 110 are detachably held together by suitable catches, as in the embodiment of Figures 1 to 6.

Claims: 1. A helmet having a rear part (10; 110) and a detachable front part (12; 112), the rear part (10; 110) comprising a shell (14) shaped to extend at least partially over the top of the wearer's head and to each side of the head, the front part (12, 112) being shaped to fit against the rear part (10, 110) to complete the shell of the helmet, connection means (50, 54) for detachably connecting the front part (12; 112) to the rear part (10; 110), said front part (12, 112) being shaped to accommodate equipment for optical enhancement or protection characterised in that the helmet is provided with a single rear part (10; 110), and two or more interchangeable front parts (12; 112) each accommodating a different piece of optical equipment (40; 113, 140, 150) and each shaped to fit against the common rear part (10; 110). 2. A helmet as claimed in Claim 1, in which the connecting means comprises releasable catches (54) having release means (57) positioned on the outside of the helmet. 3. A helmet as claimed in Claim 1 or Claim 2, in which at least one front part (12; 112) of the helmet is shaped to accommodate the optical equipment (40; 113, 140, 150) so that the optical equipment is at least partially enclosed by the helmet. 4. A helmet as claimed in any preceding claim, in which the rear part (10; 110) and each front part (12; 112) of the helmet are provided with complementary facing surfaces (38, 22, 24, 26) which engage one another when the front and rear parts are connected together. 5. A helmet as claimed in any preceding claim, in which the connection means (50, 54) includes hinge means (50, 51) connecting the front and rear parts so that the front part (12; 112) can be pivoted upwards from the closed position to enable the helmet to be donned and doffed. 6. A helmet as claimed in any preceding claim, in which the optical equipment mounted on at least one front part (12; 112) includes a visor (40; 113, 140) pivoted on the front part and movable between an operative position and a retracted position in which it is accommodated in a space defined between the front part (12; 112) and the rear part (10; 110) of the helmet. 7. A helmet as claimed in any preceding claim, in which the helmet is an aircrew helmet and the rear part (10; 110) of the helmet contains communication equipment for voice communication with the wearer.

Inventors: BRIGGS, MICHAEL
Applicants: HELMETS LIMITED
Application year: 1988
Main classification: A42B3
IPC codes: A42B3