Abstract: A chain sprocket wheel (also known as a load sheave) 10 for a hoist is generally in the shape of an isosceles triangle in side view with arcuate crests 12 forming teeth. Each side 14 of the sprocket wheel has formed therein a pocket 16 which has one semi-circular end wall 18 at one end but has its rear end open so that the pocket 16 is not complete.The pocket 16 are joined by "vertical" grooves 22 which passing through the teeth 12. The sprocket wheel 10 is used with a load chain having horizontal links 24a which are received in the pockets 16 and "vertical" links 22b which are received in the grooves 22.