Abstract: The metering device for supplying precisely measured amounts of any viscous or pasty substance comprises a main body (10) in which there is disposed an adjusting socket (12). A stopping pin (13), and a metering piston (17) are disposed opposite one another in the socket, thus bounding a movable metering chamber (4). The main body also contains an admission duct (14) and an ejection duct (15). By means of at least one control unit (31), the metering piston can be displaced, and actuating means (20) permit the stopping pin and the piston to be displaced simultaneously relative to the main body in order to free the access either to the admission duct or to the ejection duct. The main body, the stopping pin, and the metering piston constitute an interchangeable module.

Abstract: A reservoir is suspended from a support frame with two parallel arms which pivot on the transverse sides of the upright of the support frame. Two springs bent between different locations of the support frame impart to the latter different positions according to the weight of the reservoir and, therefore, according to the amount of liquid in the reservoir. The positions vary such that the level of liquid in the reservoir remains constantly at a predetermined height corresponding to a point slightly higher than the tip of the applicator needle when the applicator is placed on a bracket. The device is suitable for cyano-acrylate type adhesives and for dispensing volatile or aggressive liquids.