Cyril and Louis Keller, the brothers who invented the world’s first compact loader (later named the Bobcat skid-steer loader), have been selected as 2023 inductees for the National Inventors Hall of Fame (NIHF) in the USA. The NIHF annually recognizes inventors, promotes creativity and advances the spirit of innovation and entrepreneurship.  How it all began In the 1950s, brothers Cyril and Louis operated a small machinist-blacksmith shop in Minnesota together, building and repairing machinery for local farmers. A farmer approached them with a need for a self-propelled loader light enough to be lifted to the second floor of a turkey barn and small enough to clean around the barn’s upright poles. In response, in 1957, the Kellers built a three-wheeled loader with two drive wheels in front and a caster wheel in the rear – the predecessor to the modern skid-steer loader.   The loader came to the attention of Melroe Manufacturing Company (now Bobcat), which invited the Kellers to demonstrate their invention in their booth at the Minnesota State Fair in 1958. After a successful demonstration at the fair, the Melroe Manufacturing Company was awarded exclusive manufacturing rights to the machine on a royalty basis and hired the Keller brothers to refine the design and put the machine into production.   World’s first true skid-steer loader To improve on the design of the loader, a second set of drive wheels was added to the back of the loader in 1960. With this four-wheel drive, the M400 became the world’s first true skid-steer loader. ‘Skid-steer’ describes the unique steering system, which enables the machine to turn within its own length. Later, the Bobcat brand name was established because of the machine’s toughness, quickness and agility.   Joe Keller, son of Louis, said, “The Bobcat loader has positively impacted the lives of thousands of employees who have worked for the company, dealers who sell the machines, and customers who use the equipment every day to build their livelihood. While we may not always realize its impact, it is an integral part of our everyday life—from supporting farm operations that result in food on our tables to hauling materials around a jobsite building our homes and offices.”  Sixty-five years later As Bobcat celebrates 65 years since the invention of the machine that created the compact equipment industry, it has continued to forge the future of the industry through innovation and forward-thinking.   Bobcat now offers more than 100 products in the compact, grounds maintenance and industrial equipment industries, and produces more than 150 families of attachments.   Other awarded inventors Other NIHF 2023 inductees include Rory Cooper, who invented wheelchair technology; Luis von Ahn, who co-created the website security program reCAPTCHA; Angela Hartley Brodie, who discovered and developed a class of drugs called Aromatase Inhibitors that stop the production of hormones that fuel the growth of cancer cells; and 14 other innovation pioneers. This year marks the 50th anniversary event of NIHF’s founding in 1973, when Thomas Edison was the sole inductee.  Acknowledging the award on behalf of his father and uncle, Joe Keller said, “This recognition is a great honour to dad and Cyril’s families, but it is not just for us. It is a recognition for all of the early and current Bobcat employees who have helped bring our little ‘Keller loader’ to be the Bobcat machine it is today. It has been a great honour to have had a front-row seat watching this invention revolutionize the way work gets done around the world.”  For more information about Bobcat and Bobcat products, visit the website www.bobcat.com Building, Design & Construction Magazine | The Choice of Industry Professionals

In the Czech Republic, refurbishment of family houses dating from the 1970s is often not worthwhile and a good number of these properties are demolished. This was the case with a house in Rudná near Prague, which the owner had decided to demolish. However, quotes from companies to do the work were very expensive, so the owner decided to investigate other methods for carrying out the project. Other factors to consider included the relatively small plot of land on which the house was built, with the neighbour’s fence in close proximity and also the presence of a beautiful walnut tree, which needed to be protected during the work. In the end, the owner chose to carry out the work themselves with the help of a friend, Jiří Vrzáček, who is an industry expert, who regularly reviews machines and methods for this type of work and has carried out other demolition projects of this sort in the past. Jiří approached the project very analytically and found out which demolition solution would be the most effective, in terms of speed, overall costs and the lowest possible risk of damage to the environment. He considered three approaches – comparing the use of a large 22 tonne excavator, a classic backhoe loader or a combination of a compact excavator and a compact loader. Compact Demolition Solution Wins Out Demolition with a large excavator would be very fast, but spatially, this solution proved unrealistic and working with a backhoe loader would take too long. In the end, they chose to use a pair of machines with precisely divided tasks: the demolition work was undertaken using a new Bobcat E55z mini-excavator and the loading of debris by a new Bobcat T76 compact track loader. This combination, together with the use of specialized attachments, proved to be very effective: in just six hours, the house was completely demolished to ground level. Overall, the demolition and complete removal of debris was completed in a record two days and it was only the delays in trucks arriving at the site to take away the spoil that meant a second day was needed. Jiří Vrzáček said: “We started the demolition very carefully – we tore down the chimneys and gables by hand, due to the proximity of the neighbour. This was followed by lightning-fast demolition, which we actually had done in six hours. Next in line was the loading of 400 tonne of material, where we were mainly limited by the speed of debris removal from the site. “Here the power of specialized technology was fully demonstrated: the E55z excavator with a hydraulic grab gradually dismantled the house and piled the debris to one side at the same time as sorting through the material rather than by hand. The T76 compact track loader was then able to load 32 tonne of debris in 15 minutes. Thanks to quality planning and a really careful selection of equipment, including the attachments, we managed to reduce costs by almost half.” The Bobcat Machines Used in the House Demolition An E55z mini-excavator, which features Bobcat’s unique Zero House Swing (ZHS) feature, adding another level of protection to the standard zero tail swing design, providing full peace of mind when operating the machine near walls and other obstacles. The E55z has an operating weight of 5346 kg and offers a maximum reach at ground level of 5843 mm. The T76 is the largest of the new R-Series compact track loaders that Bobcat began manufacturing at the end of 2020. The T76 has a tipping load of 4050 kg. It can lift a load to a maximum height of 3.20 m. Attachments – they included a hydraulic sorting grab, hydraulic hammers, grapple buckets and standard buckets and others. For more information about Bobcat and Bobcat products, visit www.bobcat.com