F.O.B. Destination - freight expenses will be
added to the final invoice.
Features
Designed to hold wire rope, strand, rod or any round material
without damage or slippage
Holds equally well on wire rope with fiber core, steel core,
land lay, right regular lay, strand, guy wire or any other construction.
Variety of insert sizes available (easily and rapidly changed,
similar to changing dies in a press).
Designed primarily for proof testing, prestretching, pulling
or holding wire rope and strand without damage to the test piece.
Will grip the test piece in the middle, or body of the specimen
without damage
Makes it easy to put tension on the test specimen where end fittings
or end termination are difficult or impracticable.
May be set up for break tests. Modification is required and
must be specified when placing your order.
The Roberts Testing Equipment, Inc. Wire
Rope Grip works on a wedge principle. There are a set of wedges
in a "V" shaped
frame. As the wedges move down the "V", the center of
the wedges close on the test specimen and holds without slippage
or damage to the test specimen. Between the wedges and the "V" frame
is a set of ladder bearings which provide the smooth movement of
the wedges and allows the wedges to tighten onto the test specimen.
Unique Features
The most unique feature of the grip is its ease of opening
and closing or loading and unloading. The top sections are lifted
straight up off pins. These tops are made of alloy steel and
are made in sections with the heaviest piece being approximately
twenty-five pounds.
The second unique feature is the handle arrangement on the jaws.
The competition's models have internal springs to provide the positive
forward movement of the wedges. The internal spring causes problems
opening, holding open, and closing of the wedges. The wedges may
unexpectedly close on fingers as the operator is positioning the
test piece in the grip. By installing the handle as we have, the
internal springs were removed. The handle now provides the opening
and closing force. With the handle, the wedge movement is controllable,
predictable, and will not close unexpectedly. External springs
are attached to the handle after moving the wedges forward, thereby
providing positive forward movement to the wedges. Air or hydraulic
cylinders may be used to open, close and give positive forward
movement to the wedges. No handle is needed if cylinders are used.
The third unique feature is an addition of a frame. The frame
raises the grip to working height making it easier to load and
unload the test specimen.
The fourth unique feature is the addition of wheels. The wheels
provide a very useful function when the grip is used on the cylinder
end of the test bed. They allow the grip to move with the cylinder
and this movement forward releases all tension on the grip. The
wedges will not open when the tension is on the test specimen or
the grip. By allowing the grip to move forward with the cylinder
movement we are sure that zero tension is on the grip or on the
test specimen. For the operator, this is a very important feature
since the hydraulic cylinder is now doing the work of moving the
grip or test specimen rather than men having to physically move
these heavy objects.
The wheels allow one person to easily
move the grip from point "A" to
point "B".
Operations
The Roberts Testing Equipment, Inc. grip is very
easy to operate. First check that the grip is adequately secured
to proper anchor point. If air cylinders are used, connect air lines
to cylinders. Remove the safety pins and lift off the top bars. Next,
retract the wedges either manually or with air cylinders. Lay the
wire rope or test specimen in the grips. Replace the tops. Close
the wedges checking that the wire rope or test specimen is properly
seated. Replace safety pins. The grip is now operational.
Removal of the wire rope or test specimen is
the reversal of the above. Care must be taken that there is no load
on the wire rope or test specimen when attempting to open the wedges.
The wedges will not open if there is any tension on the wedges. When
it is desired to feed wire rope through the Roberts Testing Equipment,
Inc. grip, simply remove the tension load to the wedges, pull the
wedges back, and feed the wire rope through the grip. When the desired
amount of rope has been fed through, close the wedges. Re-apply the
positive forward pressure to the wedges either by external springs
or air cylinders. The grip is now ready for the tension load on the
wire rope. To retract wire rope through the grip, leave the wedges
closed and pull back on the wire rope. The wire rope will slip through
the wedges. There is no need to open the wedges. When the desired
amount has been pulled through the grip, stop pulling. The grip will
hold at that point.
NOTE: It is not recommended that wire rope
larger than 2-1/4" be gripped using liners due to the friction
factor. If you purchase the 3" or 4" grips, and wish to
grip smaller rope, you may purchase a set of liners for 2-1/4" and
smaller rope. To grip 2-1/2" or 2-3/4" rope (in the 3" or
4" grips), or 3", 3-1/4", 3-1/2", or 3-3/4"
rope (in the 4" grip), you will need to purchase a separate
set of wedges for each size rope you wish to grip. Call for pricing.
Call for special options...air or hydraulic cylinders,
etc. Cylinders provide power opening and closing for grip jaws.
Other special options will be priced upon application.
If on-site set up is required, travel and related
expenses will be billed at cost. Installation and training instructions
will be charged at a rate of $500.00 per day.
Shackles and wire rope slings are not included.
Note: All prices are quoted in US Dollars;
freight, customs duties, and any applicable sales tax are in addition
to the prices quoted.
