Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:52:p5
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 52 (pt 5/6)
Character Range: 92761–99221

skull. The elastic properties of the phantom head on impact are determined by the hardness and the thickness of the intermediate ring (13) and the basin.

Figure 2.1

10 kg Headform

       List of pieces for the 10 kg headform concerning Figure 2.1
Position No.  Number of pieces  Standard notation                 Material                                  Remarks
 1             1                 Magnetic holding device           Steel DIN 17100                           -
 2             1                 Vibration damper                  Rubber / Steel                            Diameter:       50  mm
                                                                                                             Thickness:      30  mm
                                                                                                             Thread:           M10
 3             4                 HF connector BNC                  -                                         -
 4             1                 Hexagonal nut DIN 985             -                                         -
 5             6                 Disc DIN 125                      -                                         -
 6             3                 Transition piece                  -                                         -
 7             6                 Cylinder screw DIN 912            -                                         -
 8             3                 Hexagonal nut                     -                                         -
 9             3                 Disc                              Steel DIN 17100                           Hole Diameter:    8  mm
                                                                                                             Outer Diameter: 35  mm
                                                                                                             Thickness:         1.5 mm
 10            3                 Rubber ring                       Rubber, hardness 60 IRHD                  Hole Diameter:    8  mm
                                                                                                             Outer Diameter: 30  mm
                                                                                                             Thickness:          10  mm
 11            1                 Damping ring                      Packing with paper                        Hole Diameter:  120 mm
                                                                                                             Outer Diameter: 199 mm
                                                                                                             Thickness:          0.5 mm
 12            -                 -                                 -                                         -
 13            1                 Intermediate ring                 Butadien-rubber, hardness IRHD about 80   Hole Diameter:  129 mm
                                                                                                             Outer Diameter: 192 mm
                                                                                                             Thickness:             4 mm
 14            3                 Guide tube                        Polytetra-fluorethen (PTFE)               Inner Diameter:    8  mm
                                                                                                             Outer Diameter:  10 mm
                                                                                                             Length:                40 mm
 15            3                 Hexagonal nut                     -                                         -
 16            3                 Threaded bolt DIN 976             -                                         -
 17            3                 Screwed insert                    Cast alloy DIN 1709-GD- CuZn 37Pb
                                                                                                             -
 18            1                 Basin                             Polyamid 12                               -
 19            1                 Cover                             Butadien-rubber                           Thickness:        6 mm
                                                                                                             Rib on one side
 20            1                 Guide bush                        Steel DIN 17100                           -
 21            4                 Counter sunk screw                -                                         -
 22            1                 Damping disc                      Packing with paper                        Diameter:       65  mm
                                                                                                             Thickness:     0.5  mm
 23            -                 -                                 -                                         -
 24            1                 Base plate                        Steel DIN 17100                           -
 25            1                 Set screw with hexagonal socket   Class of strength 45H                     -
 26            1                 Triaxial mounting block           -                                         -
 27            3                 Acceleration gauge                -                                         -
 28            1                 Wood component                    Hornbeam, glued in layers                 -
 29            1                 Cover plate                       Alloy (AlMg5)                             -
 30            1                 Protective cap                    Polyamid 12                               -

3.2.2. Adjustment and calibration
               To perform the headform test the phantom head is fixed to the cross arm of the guide system (Figure 2.2) and moved to the required drop height by means of a lifting device. During the headform test the cross arm with the phantom head is released. After passing the height adjustable light barrier the phantom head is released from the cross arm, the cross arm's fall is dampened and the phantom head falls onto the sample.

               No impulse may be given to the phantom head by the drop appliance or by the measuring cable, so that it is accelerated only by gravity