GB2303872A

GB2303872A - Helmet visor release apparatus

Info

Publication number: GB2303872A
Application number: GB9515764A
Authority: GB
Inventors: Ian Graham Thom
Original assignee: GEC Marconi Avionics Holdings Ltd
Current assignee: Leonardo MW Ltd
Priority date: 1995-08-01
Filing date: 1995-08-01
Publication date: 1997-03-05
Anticipated expiration: 2015-08-01
Also published as: IL118839A0; IL118839A; FR2737392B1; GB9515764D0; DE19630921B4; RU2160554C2; GB2303872B; ZA966006B; DE19630921A1; US5813048A; FR2737392A1

Abstract

The invention provides a helmet visor release apparatus comprising two manually operable catches, each having a first portion (4) on a helmet (1) arranged to releasably engage with a respective second portion (5) on a visor (2), and a linkage mechanism e.g. a cable (6) connected to both catches such that manual release of one catch causes the other catch to be released. Thus the visor may be released from a closed position by single-handed operation without obscuring the wearer's view. The visor can also be released by opening both catches manually, thus enabling the visor to still be released in the event that the linkage mechanism should fail.

Description

1 HELMET VISOR RELEASE APPARATUS 2303872 This invention relates to

apparatus for releasing a helmet visor from a secured (closed) position.

A helmet visor, when in use, must be held securely in place in front of the user's face in order to protect the user's face and eyes. In the case of a pilot's helmet visor, at least two catches are normally needed to secure the visor in position due to the high 'blast' forces experienced by the pilot upon canopy failure or during ejection. There is a requirement for such visors to be releasable from this secured position so that the visor may be moved away from the user's face when necessary, for example, for the comfort of the user. More particularly in certain applications, for example a combat aircraft pilot's helmet, if the visor is damaged or obscured by a "bird strike" then it must be possible to release the visor ihiately so as to avoid obstruction of the user's view which could be fatal.

It has been proposed to attach the uppermost edge of the visor to the helmet by means of a spring-loaded hinge so that the visor may be raised and lowered, and catches have also been proposed so that when lowered, the visor is held securely in place by these catches which are mounted on respective sides of the helmet and visor adjacent to the cheekbone area. It was proposed that the catches be released by means of a lever which is mounted on top of the helmet and connected to the catches by cables. This enables the visor to be released by a single handed operation, which in aircraft application has obvious advantages over a clip mechanism which requires two hands to release it. The spring-loaded hinge then raises the visor out of the user's field of view.

2 P/6067 1 /D SD The invention provides a helmet visor release apparatus comprising two manually operable catches, each catch having a first portion on a helmet arranged to releasably engage with a respective second portion on a visor, and a linkage mechanism connected to both catches such that manual release of one catch causes the other catch to be released.

It has been realised that by employing the present invention the benefits of single handed operation can be achieved without obscuring the wearer's view. It is preferable that the mechanism be such that the visor can be released by opening both the catches manually, this enabling the visor to still be released even in the event that the linkage mechanism should fail.

Preferably the linkage mechanism is a cable attached to both catches.

The second portion of each catch may be formed as an integral part of the visor, for instance as a lug protruding from the visor.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Figure 1 is a perspective view, partly in section, of a pilot's helmet incorporating apparatus constructed according to the invention; and Figures 2a-c show a section through a catch of the apparatus illustrated in Figure 1.

3 P/60671/DSD Referring to Figure 1, a pilot's helmet, indicated generally by the reference numeral 1 is fitted with a visor 2 by means of a centrally- mounted spring-loaded hinge 3, which biases the visor to a raised position. In order to maintain a lowered position when desired, i.e. in front of the pilot's face, as illustrated by the broken line, the helmet is fitted with two catches each having two portions. The first portion 4 of the catch is incorporated in the helmet 1. The second portion, in this case lug 5, is incorporated on the visor 2 and can be engaged in the first portion 4. The second catch is identical and mounted on the opposite side of the helmet, and for clarity is not shown in Figure 1. Cable 6 is also incorporated in the helmet 1, and links the first portion 4 of the first catch with the first portion of the second catch.

When the visor 2 is closed, the lugs 5 on the visor are engaged in the first portions 4 of the catches on both sides of the helmet, ensuring that the visor is securely held in front of the pilot's face. When the visor 2 is in this lowered position, the hinge 3 is held in tension. When the visor is no longer required by the pilot, he releases the catch by moving lug 7 downwards which releases lug 5 from first catch portion 4. Movement of lug 7 causes cable 6 to pull upwardly on the other catch, causing the visor lug on the other side of the visor to be released from the catch portion mounted on the helmet. Thus the visor 2 is released and the spring in the hinge 3 raises the visor out of the pilot's field of view by operation of the single catch. If, when the visor 2 is in the lowered position, the other catch is released manually, the cable 6 causes the first catch to be released and hence the visor is released in an identical fashion to that described above. Thus, manual release of either catch releases the visor.

4 P/60671/DSD A catch is shown in greater detail in Figure 2a. In this figure the visor (not shown) has been lowered into position and hence lug 5 on the visor is engaged in the first portion 4 of the catch which is incorporated in the helmet (not shown). This portion of the catch is held in tension by springs 8, 9 and 10. Lever 11 has cable 6 attached to it which connects this catch with the lever on the second catch on the opposite side of the helmet. Affixed to the lever is lug 7 which is constrained to move either up or down. Lug 7 protrudes from the helmet so that it may conveniently be moved manually and movement of this lug causes lug 5 to be released from the first catch portion 4, as shown in Figures 2b (lug 7 moved downwards) and 2c (lug 7 moved upwards).

Referring to Figure 2b, if lug 7 is moved downwards, lever 11 also pulls cable 6 downwards. Hence the corresponding lever on the first portion of the second catch will be pulled upwards by cable 6. The second catch will then assume the position of Figure 2c. Therefore, manual release of the first catch produces automatic release of the second catch. Similarly, manual release of the second catch automatically releases the first catch.

Should the cable 6 break, both catches may be released manually, by moving both respective lugs 7 either up or down permitting the visor to be raised as before.

Variations may be made without departing from the scope of the invention for instance, the catches need not be linked by a cable; hydraulic, electronic or other suitable linkage means may be employed.

Claims

P/60671/DSD 1. A helmet visor release apparatus comprising two manually operable catches, each catch having a first portion on a helmet arranged to releasably engage with a respective second portion on a visor, and a linkage mechanism connected to both catches such that manual release of one catch causes the other catch to be released.
2. Apparatus, as claimed in Claim 1, arranged such that, should the linkage mechanism fail, both catches can be released manually.
3. Apparatus, as claimed in Claims 1 or 2, in which the linkage mechanism comprises a cable.
4. Apparatus, as claimed in any one of Claims 1 to 3, in which manual release of either catch causes the other catch to be released.
5. Apparatus, as claimed in any one of Claims 1 to 4, in which the second portion of each catch is formed as an integral part of the visor.
6. Apparatus, as claimed in any preceding claim, in which the apparatus is incorporated in a pilot's helmet, the first portion of each catch being incorporated in the helmet adjacent to the cheek area, the second portion of each catch being incorporated in the visor also adjacent to the cheek area, the visor being additionally secured to the helmet by a hinge mounted on an upper portion of the visor, the hinge having resilient C> 6 P/60671/DSD means by which the visor is urged to an open position upon release of both catches.
7. A helmet including apparatus as claimed in any one of Claims 1 to 6.
8. A helmet visor release apparatus, substantially as hereinbefore described with reference to, or as illustrated in, the accompanying drawings.