{"id":17218,"date":"2026-10-29T09:19:32","date_gmt":"2026-10-29T08:19:32","guid":{"rendered":"https:\/\/ventsystems.de\/lexikon\/hebelarm\/"},"modified":"2026-10-29T09:19:32","modified_gmt":"2026-10-29T08:19:32","slug":"lever-arm","status":"publish","type":"page","link":"https:\/\/ventsystems.de\/en\/lexikon\/hebelarm\/","title":{"rendered":"Lever arm"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The <strong>Lever arm<\/strong> is the distance between the pivot point of the sash (hinge) and the point where the actuator acts. The larger the lever arm, the less force the actuator needs \u2013 but the more stroke is required for the same opening width.<\/p>\n\n\n<h2 class=\"wp-block-heading\">The principle<\/h2>\n\n\n<ul class=\"wp-block-list\"><li>Actuator far from the pivot: little force, a lot of stroke<\/li><li>Actuator close to the pivot: a lot of force, little stroke<\/li><li>that is why the actuator usually sits on the edge opposite the hinges<\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\">Example<\/h2>\n\n\n<p class=\"wp-block-paragraph\">A bottom-hung window is 1 m high. If the actuator sits at the top edge, the full lever arm of 1 m applies. If it sat at half height, it would need about twice the force for the same load.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n<h3 class=\"wp-block-heading\">Where should the actuator be positioned?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">As a rule, centrally on the edge opposite the hinges. The exact position is given in the actuator installation instructions.<\/p>\n\n\n<h3 class=\"wp-block-heading\">How does this relate to the opening width?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Stroke and lever arm together determine how far the sash opens. More in the glossary under opening width.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Read more<\/h2>\n\n\n<ul class=\"wp-block-list\"><li><a href=\"\/en\/dictionary\/thrust\/\">Glossary: Thrust force<\/a><\/li><li><a href=\"\/en\/dictionary\/opening-width\/\">Glossary: Opening width<\/a><\/li><li><a href=\"\/en\/calculate-the-thrust-of-window-drives\/\">Guide: Calculating thrust force<\/a><\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\">Not sure which actuator fits? Call us at <a href=\"tel:+494050694631\">040 50694631<\/a> (Mon\u2013Fri 8 am\u20135 pm) or use the <a href=\"\/en\/drive-finder\/\">actuator finder<\/a>.<\/p>\n\n\n<p class=\"wp-block-paragraph\"><a href=\"\/en\/dictionary\/\">\u2190 Back to the glossary<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Why the position of the actuator on the sash changes the required force.<\/p>","protected":false},"author":9,"featured_media":0,"parent":16230,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-17218","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages\/17218","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/comments?post=17218"}],"version-history":[{"count":0,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages\/17218\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages\/16230"}],"wp:attachment":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/media?parent=17218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}