Chapter 3: Additional System Details
28 M47-17028-EN
assemblies that are designed to grip specimens for tensile testing. Frames can be purchased with either
manual grip actuation (G1-style crossheads) or hydraulic grip actuation (G7-style crossheads).
Manual grip actuation - G1-style crossheads
For G1-style crossheads, the grip assemblies are actuated manually. Components of the grip assemblies
are illustrated in Figure 10. The operator uses a crank handle (2) to turn a pinion that is inside the
crosshead. As the pinion turns, it engages the rack teeth on the grip jaws (10). This action lifts the grip
jaws into the grip pocket (4). The wedge shape of the grip pocket forces the grip jaws to close and clamp
the specimen. Filler plates (9) are placed between the grip jaws and the grip pocket. For guidance on use
of filler plates, refer to information provided in the System Operating Instructions (supplied separately).
A grip stop plate (5), jaw retainers (7), and a bumper plate (11) are used to retain the jaws in the grip
pockets. For the tension crosshead, the grip stop plate is mounted to the top of the crosshead to keep the
grip jaws in the grip pocket during specimen recoil. The jaw retainers prevent the grip jaws from falling
out of the bottom of the pocket. For the adjustable crosshead, the bumper plate keeps the grip jaws from
falling out of the grip pocket.
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