CHAPTER 4
Type 4606 Features and Functions
41
The cradle positioner provides much of the adjustment flexibility of the handset positioner. It
consists of the barrel (see Fig.4.5), which bolts onto the mounting bracket (see Fig.4.6), and
the arm, which contains two single-plane swivel joints with graduations (see Fig.4.4). The
barrel provides adjustment parallel to the ERP axis (formed by the ERPs of the left and right
ears of HATS). The handset positioner is adjusted along this axis by rotating the adjustment
sleeve. The displacement can be read off a graduated millimetre scale at end of the barrel.
Pulling the collar located at the end of the sleeve, disengages the adjustment mechanism for
quickly dismounting/repositioning the cradle or handset.
Fig.4.5 Cradle Positioner Assembly showing barrel and features
Note: The locking collar must be set to the “Lock” position for the adjustment mechanism to
work.
The cradle positioner can be reverse mounted on the mounting bracket and all graduations are
mirrored giving the option of measurements on both left and right ears. Special markings are
placed either side of the main pointer to give you the option of setting positions to within half a
degree. The first joint on the cradle positioner allows you to adjust
B (see Fig.4.9.8) and is
graduated on both sides to allow measurements on both ears. The second joint also serves as
the mounting socket for the cradle and allows you to adjust
C (see Fig.4.9.9). The cradle is
fixed in place by tightening the fixing knob located at the closed end of the second joint. This
joint also has graduations on both sides to allow measurements on both ears. The joints are
positioned to allow the inclination of the handset about the ECRP in two planes.
4.1.4 Mounting Bracket
This mounting bracket sits on the head of HATS locating the whole handset positioner for
HATS accurately. The lockable slide mechanism (see Fig.4.6) allows mounted handsets to be
rotated about the ERP axis (formed by the ERPs of the left and right ears of HATS). As with all
points of adjustment on Type 4606, the bracket has graduations that can be easily read off and
noted down for documenting the measurement. To ensure accurate positioning, which is
essential for mounting Type 4606 correctly, four screw studs are provided that are the points of
contact between the HATS head and Type 4606. For details see section 4.2.
Barrel
ERP-axis displacement
scale in millimetres
Adjustment
sleeve
Locking
collar
Applied force scale
in newtons
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