Naval Group has been granted a patent for a projectile design that includes a rotating shaft and a screw. The screw can slide axially between two positions, with an elastic return element providing stress in each position. The design allows for controlled propulsion and movement of the projectile. GlobalData’s report on Naval Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Naval Group, hydrogen fuel cells was a key innovation area identified from patents. Naval Group's grant share as of September 2023 was 66%. Grant share is based on the ratio of number of grants to total number of patents.
A projectile with a rotating screw and elastic return element
A recently granted patent (Publication Number: US11761741B2) describes a projectile with a unique propulsion system. The projectile includes a shell and a propulsion element. The propulsion element consists of a rotating shaft and a screw that is driven in rotation by the shaft. The screw and the shell have opposing stops and counter-stops. The screw can slide axially along the rotating shaft between two positions, one with a clearance between the stops and counter-stops, and another with them in contact. The propulsion element also includes an elastic return element that can be reversibly deformed between two states of stress corresponding to the two positions of the screw.
In one embodiment, the elastic return element is a compression spring. The screw may also have a second counter-stop, and the propulsion element may include a second rotating shaft and a second screw. The second screw can slide axially along the second rotating shaft between two positions, similar to the first screw. The propulsion element further includes a second elastic return element, which is also reversibly deformable between two states of stress corresponding to the two positions of the second screw.
The projectile may have a thrust surface that transfers an axial force to the first screw. This thrust surface can be borne by the second screw, which is axially opposite the second counter-stop. The patent also describes a launching assembly that includes the projectile and a launching tube with an inner chamber and an ejection device. The ejection device exerts thrust on the thrust surface of the projectile to eject it from the inner chamber.
The patent also discloses a method for launching the projectile. The method involves applying an axial force against the thrust surface, transferring the force to the first stop to cause the first screw to slide along the rotating shaft, and launching the projectile by transferring the force from the first screw to the shell. The method also includes releasing the elastic return element from its second state of stress to its first state.
Overall, this patent describes a unique projectile design with a propulsion system that allows for controlled movement of the screw along the rotating shaft, providing enhanced performance and launching capabilities.