a 30000€ grant from BPI FRENCH TECH

In 2018, thanks to a 30000€ grant from BPI FRENCH TECH, Push4M developed and optimised its proof-of-concept prototype: a lever-arm actuator that requires low input capacity.

The principle objectives were achieved in April 2018:

In a confined space, the transverse-thrust actuator

mobilised a lever arm through 180 degrees

with a thrust force ranging from 0 to 1/2 of the minimum traction force imposed on current systems (lifting cylinder or rotary engine) (all prototype types and sizes),

whilst being totally insensitive to vibration

and providing material cost savings due to the use of standard, light materials.

The first 9 prototypes produced a traction of over 5 times the machine weight, with automatic mechanisms.

The patented technology is simple to use – the lever arm can be easily raised, lowered or stopped, whether it is loaded or empty.

By June 2018, the secondary objectives of reliability and power capacity will be confirmed. The V10 prototype features standard industrial materials only.

Initial testing has already validated the solidity and reliability of the chosen materials. What remains to be confirmed is the system’s capacity to produce zero energy expenditure when locked in a designated position.

One or two months of testing is necessary to fine-tune the controls before an official presentation can take place.

This presentation will mark the conclusion of 4 years of research that began with physical and medical observations and which concluded that “muscular contraction cannot be due to initial tractive force”.

This original approach inspired Nicolas de Lussy to develop mock-ups to prove that transverse thrust is much more efficient that longitudinal traction.

The aim was to demonstrate that muscles use transverse thrust force rather than longitudinal tractive force as the direction of application of initial force in order to develop longitudinal force in the muscle fibres and thus move lever arms.

This notion of transverse thrust is in contrast with the direct longitudinal muscle force interpretation of H. Huxley and J. Hansen that has been generally accepted since 1954 and has formed the basis of all current industrial lever arm actuator system designs (cylinder and rotary engines).

Now we can harness the advantages of transverse thrust to offer an alternative solution for energy-sparing industrial lifting applications.


Ten successive prototypes have been developed by the research team, each one more precise than the last, and now Push4M can confirm that:

1-the innovation of transverse thrust for this application means that the lever arm requires only limited space to operate – the transverse perimeter required is less than twice the size of the longitudinal axis of its mount, which itself is 1.2 times shorter than the lever arm to be displaced.

2-transverse thrust enables movement of a class 3 lever with a ratio of less than 2:10.

3-the innovation of transverse thrust for this application means that the lever arm is contained in this volume and can move through more than 160°.

4-the innovation of transverse thrust for this application means that the lever arm moment can be balanced by varying the effort applied perpendicular to the support mount and varying from 0 to 100% of half of the minimum effort to be applied directly on the same part of the lever.

5-transverse thrust is not directly subject to lever arm vibration.

6- the transverse thrust solution does not require any power when the arm is stationary until the moment when movement is re-initiated.

Want to know more?

Push4M creates innovation for your research and development

Health sector: muscle transverse thrust changes and enhances the interpretations of force development distribution for biomechanics users.

Would you like to deepen your knowledge to qualify and quantify your medical and paramedical procedures?

Save time, be more efficient, contact us.

Sectors requiring load handling: the transverse thrust actuator licence will enable you to improve your competitiveness. Push4M can help you to configure your models by lowering your equipment’s peak force without any loss of power.

Push4M opens the door to the corobot market – small, powerful machines to help with the last 50 metres of materials handling on worksites.

It is the opportunity to improve productivity and to reduce the risk of operator MSD.

Save time in your R&D, ask for a quote for Push4M licence and technical assistance.

Humanoid robot sector: the Push4M licence allows you to add lightness and power to your mobile structure.

It will be able to move two to three times its weight.

Save time in your R&D, ask for a quote for a Push4M licence and technical assistance.