C & E. Fein Gmbh & Co.

Klaus M Junginger

Manfred Fink

Wolfgang Schreiber

Georg Harsch

Peter Grunikiewicz

Karl Gommel

In order to improve an angular, U-shaped knife for cutting tools for severing beads of adhesive on window panes of motor vehicles which is drivable about a point of rotation with a small swivel angle and at a high frequency and which comprises an attachment part with a receiving means connectable to a drive shaft coaxial with the point of rotation as first U-leg, an intermediate part as central U-leg and a cutting part as second U-leg, such that while having the same cutting capability as the curved, sickle-shaped knives it is also suitable for completely severing the bead of adhesive throughout its entire width in a corner region, it is suggested that the cutting part be of straight orientation.

Knife with a straight cutting part

In motor-operated machines, especially portable electric tools, it is essential to prevent an impermissibly high torque on the driveshaft or operating spindle. This is attained by means of a torque-disengagement mechanism. An especially elegant, compact, precisely responsive torque-disengagement mechanism is attained by mounting one of the two bearings for a driveshaft in the machine housing or similar structure in such a way that it can move across the longitudinal axis or radially far enough to initiate a switching procedure. The bearing is secured in an initial position by means of an opposing force. The position represents both the zero position for the switching procedure and the correct position of the axis of the driveshaft during operation. If the machine includes a means of varying the torque, the power of the opposing force can be adjusted and maintained either continuously or discontinuously. The opposing force is generated in a practical way by a spring, specifically either by a compact but still powrful stack of cup springs or by a torque rod, both requiring little space.

Portable electric tool with variable torque

A power-screwdriver device with variable torque adjustment consists essentially of a drive mechanism, transmission, and cutoff mechanism. In order to provide a power screwdriver that is strong and inexpensive and in which the torque can be controlled with no need for a torque clutch, there is a bearing site on a transmission shaft. The bearing allows the shaft to move radially. There is a sensor that emits a motor-cutoff signal when the shaft does move radially. The radial deviation is employed as a measure of torque. The measure is adjusted with an adjusting device.

Power-screwdriver device with variable torque adjustment

A cutting tool for separating beads of adhesive, with a U-shaped cross-section consisting of two flanks connected by a web. One flank is a sickle-shaped blade and the other is employed to attach the tool to an oscillating driveshaft. The center of curvature of the sickle shape extends toward the point at which the cutting tool is secured. The web between the tensioning shank and the blade may have ridges. These ridges extend to the sides of the tensioning shank and blade. The web is longitudinally curved between the tensioning shank and the blade, and has round edges.

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Stuttgart, Germany

Klaus M Junginger