Launch Frame

TM 5-5420-279-23

locally by its integral lever or remotely using integral proportional control valves. One slice is used

to operate the raise and lower of the upper A-Frame transverse beam when changing between

launch beam and bridging module sequences and the other controls the inclination of the rollers

during initial bridge deployment. The slices of the control valves are operated by button switch

selection on the interface cabinet or by valve handles.

1-10-14 Launch Frame

The launch frame is a steel framework through which the launch beam passes during

launch beam deployment. It is attached at its forward end to the upper A-Frame transverse beam

via a pivot. When the upper A-Frame transverse beam is in its lower position, the rear end of the

framework is supported by the launch frame articulating hydraulic cylinders. Once beam

deployment is complete, the lower end of the articulating hydraulic cylinders are disconnected

and moved by retraction of the articulator stowing cylinders to a stowed position to give clearance

for the bridging modules.

The forward launch beam is retained in the launch frame after beam retrieval, ready for the

next beam deployment.

Mounted on the framework are various roller assemblies, two drum winches, the launch

beam drive unit and launch valves.

At the upper part of the launch frame is a cam-operated launch beam stop to prevent over

deployment of a launch beam if no following beam is attached. The launch beam stop is lifted by

a roller on the following beam, which raises the stop and allows forward motion of the launch

beam.

Fig 1.5 Launch Frame

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