button spring
- Button springs are used to achieve an auto push back
mechanism for the button.
inner shaft spring
- Inner shaft spring is used to enable the hollow shaft
move above the base shaft automatically as soon as the catch
is released.
- The main spring acts as a connection between the two prismatic
pairs of the five bar linkage (3R & 2P) . The funtion of the spring
is to open up the umbrella as soon as the maximum length of
the umbrella is achieved. It is seen that when you close the umbrella
initially the force required is more because of the component
of the force used in the compression of the spring is less initially.
A detailed description of this mechanism can be studied in the linkage part.
- This spring is attached to the topmost portion of the
umbrella and bears the shock while the umbrella is opening.