Abstract: A ladder leveler is disclosed in which two pivoting arms are mounted on a base plate to provide a self-adjusting and infinitely adjustable device. The two arms cooperate with a movable locking member or tumbler which is mounted between the arms and shaped to permit the arms to self adjust for uneven ground and lock the arms against movement when weight is placed on the ladder. The device may be readily secured to and removed from the base of a ladder without extensive disassembly.

Abstract: The invention concerns a measuring device for measuring the diameter of a rotationally symmetric body, for instance a roll, with a measuring jaw that wraps around the peripheral surface of the body and features two arms, and with two styli of which each is arranged on the free end of an arm for scanning the peripheral surface. The invention is characterized by the following features: the arms have an essentially straight-line design and the arms are constructed of rails which form a parallelogram with each other and permit swiveling in the sense of setting or retracting the respective stylus on or from the peripheral surface.

Abstract: A measuring head for measuring article contour positions comprises a casing with a feeler pin mounted in the casing for pivotal movement in three-dimensional directions. A separate spring biases the feeler element in a neutral position in each of the three dimensional movement directions and the feeler pin is movable against the bias in all directions in a measuring movement. The measuring head is provided for measuring equipment for multi-coordinate measuring instruments and machine tools and is provided with connections for a digital or an analog evaluation of the measured value. Preferably a plurality or rope elements are connected to the feeler pin to hold it in its coordinate zero position within the casing and to extend in the respective X, Y and Z directions and are in equilibrium with each other in their state of rest.