Instron 2716 Series, Operating Instructions Manual

Page: 14 / 36

Chapter: Introduction
14 M10-14402-EN
Description
Components
The major grip components are the body, control mechanism, and jaw faces.
Body
The machined alloy-steel body has a vertical center bore with an integral threaded stud
extending away from the body. A control nut threads on the stud and a spindle passes
through the bore.
The grip body has a machined open cavity. Each side of the cavity tapers toward the
open end of the body. The jaw faces have a matching taper such that as the faces slide
toward the open end of the cavity, they are forced together and thus provide a gripping
force on a specimen.
Side plates, screwed to the front of the grip body, retain the jaw faces within the cavity.
On the rear of the body, a spring-loaded plate slides in tracks screwed to the body. Pins
in the grip jaws extend through slots in the plate. The spring force on the plate, and
transmitted to the jaw pins, pushes the grip jaws against the tapered sides of the cavity
and also provides a constant retraction force on the grip jaws.
Control Mechanism
The control mechanism consists of a control nut and spindle. The control nut is a short
steel cylinder with a center bore and internal threads. The nut threads onto the body
threads. Handles on the control nut let you easily tighten and loosen the grips.
The spindle is a steel shaft with a one end either threaded or machined to accept a
clevis pin, The other end is machined for a shear pin which secures a flat spindle pad.
The threaded end passes through the control nut. The spindle pad slots into the base of
the jaw faces. Rotation of the control nut moves the grip body while the jaw faces are
held stationary. As the grip body moves, the tapers in the cavity move the grip jaws
laterally to grip or release the specimen without exerting a longitudinal (tensile or
compressive) force on the specimen.
Faces
Various jaw faces are interchangeable in each grip model size, to accommodate a range
of flat or round specimen sizes. There are four jaw faces in each set; a left and right face
for each upper and lower grip.