A kind of release mechanism with what wheelchair includes a pedestal, one first fixing axle, one second fixing axle, a control-rod, one first block, one first rocker arm, one sets the first brake component of the first rocker arm of what, one first moving part, one second block, one second rocker arm, second brake component and one second moving part for setting the second rocker arm of what. Control-rod is put with respect to the first fixing axle pivot, and the first block has the side on the what control-rod pivot pendulum direction of one first stop section position, and the first block, pedestal, the first rocker arm and the first moving part form a four-bar linkage system. Second block has the other side on the what control-rod pivot pendulum direction of one second stop section position, and the second block, pedestal, the second rocker arm and the second moving part form another four-bar linkage system. Thereby, control-rod can control the first, second brake component actuation respectively.一種用於輪椅的安全機構包括一基座、一第一固定軸、一第二固定軸、一控制桿、一第一擋塊、一第一搖臂、一設於第一搖臂的第一制動件、一第一連動件、一第二擋塊、一第二搖臂、一設於第二搖臂的第二制動件及一第二連動件。控制桿相對第一固定軸樞擺，第一擋塊具有一第一擋止部位於控制桿樞擺方向上的一側，第一擋塊、基座、第一搖臂及第一連動件形成一四連桿系統。第二擋塊具有一第二擋止部位於控制桿樞擺方向上的另一側，第二擋塊、基座、第二搖臂及第二連動件形成另一四連桿系統。藉此，控制桿可分別控制第一、第二制動件作動。
