Abstract: A test glass changer for optically measuring layer properties in a vacuum coating system including a movable substrate holder for guiding a substrate through a stream of coating material; a mount connected to a rotary spindle and rotatable relative to the substrate holder about the rotary spindle; and a control device directing a test glass element into a ray path of an optical measuring device and into a stream of the coating material. The mount has at least two recesses offset eccentrically with respect to the spindle for one test glass element in each case. The control device can induce a rotational movement of the mount about the spindle. The centering device can exert a torque and holding moment on the mount to bring a test glass element arranged in one of the recesses into a measuring position of the measuring device. Related methods are also provided.

Abstract: A safety hook for mounting on the extremity of a spreader bar of a patient lift is secured to a base member that is connected to or integral with the spreader bar. A load-bearing hook member is pivotally suspended from the base member to allow the hook member to move in the plane of the hook member between an open position and a closed position in which the free end of the hook member engages the base member at an engagement point. The hook member is shaped such that it is urged to the closed position when a downward load is applied to it, and that it is urged to the open position when an upward load is applied to it. Under normal circumstances the safety hook closes automatically because of the weight of the load.

Abstract: A clip for connecting to a ring or the like has a resilient bow and first and second hook portions at first and second ends of the bow. The second hook portion has a pair of spaced apart hook parts. A hook is formed in each hook portion. The clip can be opened by squeezing the bow in a transverse direction until the first hook portion extends between the hook parts of the second hook portion with the hooks facing one another. The first hook portion extends far enough that a gap exists between the hook portions through which a ring may be inserted into the hooks. When the clip is released, the bow biases the hook portions outwardly so that the ring is captured in a loop formed by the hooks. The clip may be fabricated from resilient plastic. The clip has many uses anywhere that it is desirable to clip something to a ring or the like. The clip may be made so that it is easy to open while wearing gloves.