Screw grips One gripping jaw is operatedmanually via screw drive. The other gripping jaw can be set in fixed steps, steplessly or may be positioned stationary (see photo: screw grips). Wedge-screw grips Pincer grips These specimen grips are acombination of screw and wedge grips. With the screw drive, the gripping jaws are closed and opened – and the initial gripping force is generated. If the vice is closed, the wedges generate the increasing force effect.Optionally, the screw drive caneither be driven by motor, be controlled manually via push buttons or externally (see photo: wedge-screw grips). This pincer-type specimen grip alsohas the increasing force principle. The initial gripping force is applied by a pre-stressed spring. The pincer principle generates a gripping force which increases superproportionally to the tensile force. It is particularly suitable for tensile specimens made of soft, highly extensible rubber and elastomers which become extremely strong prior to the specimen break (see photo: pincer grips). Spring loaded grips These grips are particularly suitablefor tests at very low forces. The mass of the specimen grip is of particular importance here: Its weight is compared to the nominal force of the connected load accumulator so small that its load measuring range is not restricted.The gripping force is generated by aspring with adjustable spring force. Thus, sensitive materials can be tested by using a predefined and constant gripping force (see photo: spring loaded grips).
Screw grips Wedge grips Wedge-Screw grips Wedge grips Two wedges actuated manually via lever are pressed against the specimen at a low pre-load generated by a spring. The wedges cause an increasing force effect. The gripping force increases with the increase in tensile force (see photo: wedge grips)
Pincer grips Spring loaded grips 30