Abstract: In a Hooke's joint comprising two yoke elements interconnected by a connecting member, the connecting member has trunnions received in respective bearing cups which are fitted in apertures formed in the arms of the yoke elements. Each arm of each yoke element has a retaining element to retain the associated bearing cup in the opening of the arm. The retaining element on one arm of each yoke element is adapted to bias the associated bearing cup towards the centre of the joint; whereas the retaining element on the other arm of the yoke element is adapted to function as a rigid stop to limit movement of the associated bearing cup away from the centre of the joint but not to bias the bearing cup inwardly of the joint.

Abstract: An apparatus for intermittently sounding an audible alarm when the temperature within a deep freezer rises to a predetermined level which is less than the freezing temperature of most food products so that steps can be taken to prevent the food products from thawing. The apparatus includes a remote bulb element which intermittently opens and closes a container of liquefied gas which is permitted to expand and sound an alarm when the freezer malfunctions.