Push-pull chain actuator with reduced chain vibrations

A push-pull chain actuator comprising:

• a housing with a chain exit/entry opening,
• a push-pull roller chain with an open back, said chain comprising a plurality of pairs of inner links and pairs of outer links that are connected by drive pins with rollers that are disposed between opposing inner links of said pairs of inner links,
• a sprocket arranged to engage said rollers of the push-pull roller chain, whilst a portion of the push-pull roller chain is guided around the sprocket, said sprocket causing a polygon effect during operation,
• a chain guide comprising:
• a first arc shaped chain guide part for guiding said portion of said push-pull roller chain around said sprocket by the rollers of the push-pull roller chain being guided by the first arc shaped chain guide part,
• a second chain guide part for guiding said push-pull roller chain in a predetermined exit/entry direction between the sprocket and an chain exit opening by the rollers of the push-pull roller chain being guided by the second chain guide part,
• wherein said second chain guide part is shaped and dimensioned to neutralize or at least reduce variations in chain speed caused by the polygon effect of the sprocket on the push-pull roller chain by including a deviation from a straight line that causes the rollers to follow a meandering path between the chain exit opening and the sprocket.