Whitworth Quick Return Mechanism
From DT Online
Description
The Whitworth Quick Return Mechanism changes rotary to Oscillating Motion but, unlike the Crank and Slider, the forward reciprocating motion is at a different rate to the backward stroke.
It is also a type of Coulisse Mechanism in reference to the slotted crank (i.e. as in Portcullis from the French ‘porte coulissante’ and derived from the Old French ‘Coulisse’ referring to a timber member grooved to take a sliding panel)
Features and Applications
At the bottom of the slotted arm, the peg only has to move through a few degrees to sweep the arm from left to right, but it takes the remainder of the revolution to bring the arm back. This mechanism is most commonly seen as the drive for a Shaping Machine.
Animations
- Examples from Nguyen Duc Thang's YouTube Channel 2100 Animated Mechanical Mechanisms
| Coulisse Mechanism | Combined Coulisse Mechanisms - combination of two Coulisse Mechanisms. The green rocker has working stroke slower than return one.. | Shaper with Coulisse Mechanism - reciprocating motion having working stroke slower than return one. |
