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Anvils Patented Cluster Sheaves now available on all cable grabs.

Posted by Anvil Attachments on Wed, Mar 13, 2013 @ 10:36 PM

Anvil has now adopted their patented cluster sheave design across its entire line of cable buckets and grapples. Anvil received its Patent for their Cluster Sheave design in 2008; its early use was primarily on their 4 rope direct reeve clamshell buckets. The results of this design have been tremendous by increasing cable life up to 3 times.

Anvil Attachments continues to be on the forefront of bucket and grapple innovation. Anvil has learned that quality bucket design does not only come from their use of cutting-edge technology, 3D design, FEA analysis and LEAN manufacturing. The primary source of quality design comes from the customers themselves, the men who are in the field all day working with their equipment. Anvil is continually questioning their customers, asking them what they would like to see in a bucket or grapple, what don’t they like and how can we improve.

One thing that customers repeatedly stated as an issue was having to stop in the middle of a job to restring cable. This is a time-consuming and costly process. Not only is the cable expensive, but there is also the cost of downtime while unhooking the attachment, restringing, then re-hooking. This often occurs in the middle of a job, where time is money.

Jon Craft, president of Anvil, was having dinner with a large group of Kone Crane representatives in Houston. They were discussing issues with clamshell buckets, and the highest complaints have always been cracking and cable wear. Together, they all talked and drew different ideas on napkins; Jon's idea was the cluster sheaves which Anvil manufactures today.

sheave is a wheel or roller with a groove along its edge for holding a belt, rope, or cable. When hung between two supports and equipped with a belt, rope or cable, one or more sheaves make up a pulley. The words sheave and pulley are sometimes used interchangeably. The purpose of the cluster sheave is to replace a fair lead or the standard guide rollers that have been the industry standard for years. The average guide rollers were 4 inch round and cylindrical. When the grab leans over or lists, the cable is actually rolling over a flat cylinder object. This works against all the standard criteria for adequate cable life. The cluster sheaves create a true circle in a larger diameter, similar in shape to the cable.

Cluster Sheave Assembly

The patent was approved for the cluster sheave design in 2008 and, over the past five years, the results have been better than first anticipated. This design has drastically increased cable life for Anvil’s customers, doubling and tripling in most instances. Chevron in Pascagoula, MS states “Anvil has been able to double our cable life resulting in savings of over $125,000.00 per year on the cable alone.” Motiva in Port Author, Texas says “We have increased our run cycles over 200% with the new model bucket from Anvil.” And finally, Don Paulino with Kone Cranes states “We feel the Anvil product line adds value to our crane systems. It is the only bucket we will offer with our packages.”

Here is an example of the cost savings that the cluster sheaves can bring: 

  • Cable cost estimated @ $4.218 per. ft.
  • Monthly Estimated cost @ $26,494.34
Annualizing the cost of cable 
  • $317,932.00 per yr.
  • Reduced by ½ and you save $158,966.00
  • This does not include labor.
  • This also does not include down time.


Up to this point Anvil used this design strictly on its 4 rope direct reeve clamshell buckets. Anvil has now adopted this design across its full line of cable buckets and grapples. This includes two and three rope applications. Anvil most recent adaptations include using this design on its radio controlled single line clamshell buckets and two 15 cubic yard 4 rope 8 tine scrap grapples being used in a stevedoring operation.

Tags: 4 Rope Clamshell, Clamshell Bucket, Coke Bucket, cluster sheave

Anvil Ships Coal Bucket – Innovation in Coal Bucket Design

Posted by Anvil Attachments on Mon, Feb 04, 2013 @ 04:35 PM

Coal BucketPictured above is Anvil’s latest 4 rope, fleet through coal bucket, shipped to an Energy company in the Midwest.  At first glance, it may appear to be a standard coal bucket, but a closer look reveals the innovation in Anvil’s design and manufacturing.

The bucket is a 12 cubic yard (9 ton), 4 rope, fleet through clamshell bucket built to Anvil’s high standard of quality.  This bucket is specifically designed for the handling of coal and the impacts of working in that environment.  This coal bucket features Anvil’s patented cluster sheaves.  The cluster sheaves replace traditional guide rollers and dramatically increase cable life.  Customers who have opted for the cluster sheave option experience 2 to 3 times the cable life over the standard guide roller configuration used by other manufacturers.  This 4 rope bucket’s cluster sheaves have 16 sheaves in 4 clusters.  This provides much greater surface area over roller guides. 

Coal Bucket | Cluster Sheaves

In addition, this bucket has reversible bolt on edges, or “lips."  Bolt on edges increase bucket life by taking most of the wear while the bucket closes on material and the ground surface.  On a traditional coal bucket, the bottom and side lips would have to be replaced after wearing.  With the bolt on edges you simply replace the edges.  The edges are usually replaced many times before having to replace the lips. 

Another feature of this four rope coal bucket is the rubber bumper attached to the head unit.  The rubber bumper is designed to protect against impact on the head unit as the operator lifts the bucket to  the top position.  Traditionally, the bucket would bang against the top of the crane; this action causes stress and cracking on the bucket.  The rubber bumper absorbs this force, similar to the way a shock absorber in your car absorbs shocks.

Coal Bucket | Grease LinesProper maintenance on your bucket ensures that you will get maximum life out of your investment. Anvil makes it as easy as possible for your maintenance crew to properly grease the bucket.  The picture above shows the central lube area of the bucket.  You will notice the grease manifold and grease lines are enclosed and protected.  Every required grease point in the upper extremities for the bucket is greased from this location, there is no guessing and no searching for grease points.

Anvil Attachments is continually improving its products and developing new innovations.  This is done through years of experience and communication with clients to discover their needs and wants.  When a client discusses any problems or issues, Anvil works with them on a solution.

Tags: 4 Rope Clamshell, cole bucket, rope coal bucket

Anvil ships 4 rope Coke clamshell bucket to Petroleum Coke refinery

Posted by Anvil Attachments on Mon, Jan 14, 2013 @ 09:48 AM

4 Rope Clamshell Bucket

Pictured above is Anvil Attachment’s latest 4 rope direct reeved coke clamshell bucket, model 4RD, getting prepared for shipment to a customer.  The coke clamshell will be utilized for bulk handling of coke in a petroleum refinery in south Louisiana.  The 4 rope bucket features Anvil's patented cluster sheaves, which will provide up to double the cable life over the competition's guide rollers. This clamshell also features a perforated bowl for dewatering of the coke material.  The lower sheaves are enclosed to prevent debris from accumulating.  This bucket also features bolt on lips.  Bolt on lips prevent wear damage to the bowl and are easily replaceable when necessary.  This unit has recessed greased lines for protection and easy maintenance.

Anvil’s 4 rope coke clamshell buckets have become the industry standard in the coking industry.  This is due to Anvil's dedication to quality and continually improving on design and features.

Tags: 4 Rope Clamshell, Clamshell Bucket, Coke Bucket