cadex defence

Dynamic Retention System (SNELL)

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Our strap retention machines are the most advanced on the market. To minimize the weight and lower shipping costs they are mostly made out of aluminum. The few steel parts that are used are nickel plated for corrosion resistance. However, this machine should not be exposed to water or rain because of its electronic components.

It is recommended that all our testing equipment be used in ideal working conditions (18 - 29 degrees C and less than 65% humidity).

Dynamic Retention System
  1. EN 960-Half-Magnesium K1A headform : Sold separately.

  2. Headform support.

  3. The headform support can be raised or lowered up to 10 inches (25.4cm).

  4. The handle command control's the pneumatic air cylinder in the back of the machine. It has a UP, Neutral and Down position and is used to modify the height of the release mechanism.

  5. The sensor device will read the real time displacement of the test sequence. It has a displacement capability of 0 to 15 cm and needs to be connected to the power conditioning unit of the machine. The sensor is the most sensitive and delicate part of the machine, which is why it is designed so close to the main frame. This will help protect it and minimize the chance of an accident during testing. The sensor comes with a calibration device that should be used to verify the accuracy of results.

  6. The release system sends the command that drops the mass from the top to the down position in order to perform the impact test on the helmet. The button must be pressed for a few seconds to give the machine time to react to the drop command.

  7. The drop mass weight (10Kgs) is made out of steel, covered with non-corrosive plating to protect the device.

  8. The air entry outlet for compressed air. The machine will need to be connected to a compressor to work properly. The pressure should be between 80 PSI (min) and 150 PSI (max). That air entry device has a small container that accumulates water that is separated to avoid any moisture getting into the air line system of the machine. The container needs to be emptied manually, so it is important to keep track of the container's water level. Simply press the release water button on the water receiver bottle to have the water evacuate the device.

  9. Width: 23 inches (58.42 cm).

  10. Height is adjustable:
    • Min: 73 inches (185.42 cm) - as shipped
    • Max: 83 inches (210.82 cm)

  11. Depth: 33 inches (83.82 cm).

  12. Strap attachment.

  13. The release mechanism of the machine is used to retain the drop mass of 10 kg in place before the test.

  14. The main frame of the drop assembly guiding system of the machine. This section includes the bottom stopper support, long rod guide as well as headform attachment. The complete main guiding support with all the parts that represent the preload of the helmet prior the test should be 15 kg (including the head form). To make sure that all headforms (regardless of size or weight) respect the 15 Kg specification, an additional ring that comes with each headform can be installed.

  15. The bottom pedal is used to move the guiding system UP. This makes it easier to remove or re-install the complete headform with helmet from the machine. It is also recommended that you remove the drop mass from the UP position with your pneumatic device (section 4, 11, 12) so you will have less weight to carry during this process.

  16. The power conditioning unit of the sensor device. This unit needs to be connected to a 115 VAC/60Hz or 220VAC/50Hz power source. The sensor and the electronic conditioner box connect to this device. A BNC connector output is also required to connect to a computer system in order to measure the real time displacement. Cadex Acquisition Software has been developed to monitor this signal system.

  17. The pneumatic air cylinder allows the drop mass to be moved up or down. The air cylinder will need a minimum air pressure as described in section 7.

  18. This lever allows you to lower or raise the headform support (section 3).