Principle of operation
The wedge action principle of these grips allows
them to be tightened onto a specimen without
altering the vertical position of the faces in
relation to the specimen. This is accomplished by
a design which moves the grip body to close the
faces. This feature makes it possible to pre-select
the exact point at which the specimen will be held
with consistent gage length and no compressive
force applied which may cause specimen
buckling.
A strong clamping force can be applied to
materials that are difficult to hold through a high
mechanical advantage achieved by the tightening
mechanism. The grip faces are spring loaded
against a shoe which is in a fixed position in
respect to the testing frame holding mechanism,
only a light initial gripping force needs to be
applied to the specimen.
As the grip is tightened, it's frame is drawn up and
the inclined sides push against the matching side
of the faces which move laterally against the
specimen. The open front design of the grip
frames allows faces to be easily interchanged as
well as easy specimen loading. Because the faces
are held in a fixed position, there is no recoil, or
loosening when the specimen ruptures, and if an
extensometer is attached, it will remain in place.
With the optional specimen centering device, a
specimen can be easily placed on center of the
faces. This device is adjustable from front to back
and locked on with thumb screws.
Application range
K Type of loading: tension
*Not suitable for through-zero/reverse stress or
fatigue testing
K Specimen material: wires, plastics, metals,
elastomers.
K Specimen shapes: flat, round.
Features
K Rated capacity 30 kN (3,000 kg, 6,700 lb)
K Quick set-up with rapid clamping and
unclamping action
K Self-tightening wedge design eliminates
slippage
K Interchangeable jaw faces for a range of
specimen geometries and types
K Fixed faces and moving body during
specimen loading
K Slack-free connection to test instrument
K Quickly change faces without tools
K Optional - specimen centering devi