16
ASSESSMENT OF THE PROPER FUNCTIONING OF THE BASIC
MECHANISMS AND ASSEMBLIES IN THE STROLLER AND WAYS OF ASSESSING THE
WEAR OF PARTS TO BE REPLACED
A. MECHANISMS AND ASSEMBLIES
1. Foot brake (parking) mechanism
The brake mechanism works properly if, after pressing the brake rod with the foot, the
rear brake pads (14) rest freely on the tire, and the front brake pads (13) brake the
wheels as a result of a gentle suffocation into the tire.
Switching on and off should be smooth – without jams, friction and grinds.
2. Handbrake mechanism (if the stroller has one).
The handbrake mechanism shall function properly if, when the lever is pressed with
the hand (16), the rear wheels brake simultaneously and with equal efficiency.
After releasing the lever, the wheels should rotate freely.
3. Backrest tilt adjustment mechanism
The mechanism determining the position of the backrest works properly if, when
adjusting the angle of inclination in its entire range, the lever of the mechanism is not
tightened, the backrest under the influence of the pressure of the user's back remains
in a fixed position. However, it is recommended to adjust the mechanism in such a
way that the backrest gives way slightly under the influence of very strong and
dynamic blows of the patient's back.
4. Footrest tilt adjustment mechanism
The mechanism for determining the angle of inclination of the footrest works properly
if the angle of its inclination can be blocked without difficulties and jams.
A prerequisite for the proper operation of this mechanism is an undamaged (not bent)
footrest support.
5. Chassis
The bogie chassis consists of:
▪ front axle,
▪ rear axle,
▪ rear axle suspension system,
▪ Braking
▪ Wheels.
Anyway:
• the axles must be straight and their sliding tips must show no signs of abrasion
and damage to the thread or the mounting groove of the wheel cap,
• in the rear axle suspension system, both spring springs must work evenly,
• the braking system must function properly,
• properly fixed wheels must not show excessive axial
and lateral clearances.
• Remark:
• The permissible axial clearance of a wheel mounted on a fixed axle shall not exceed 3 mm,
the permissible lateral deflection measured on the greatest radius of the wheel shall not exceed
6 mm, and in the case of front swivel wheels, palpable clearances on their axles shall require
tightening of the nut on their axles or repair.
6. Hand railing
A hand railing should be considered good if its ball clamps work efficiently
While driving, the patient's hands should not approach rotating wheels
(see subsection SAFETY RULES page 15).
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