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The crawler crane is a specific type of mobile crane which is available with either a lattice boom or a telescopic boom that moves upon crawler tracks. Because this unit is a self-propelled crane, it is capable of moving around a jobsite and accomplishing tasks without much set-up. Due to their huge size and weight, crawler cranes are rather expensive and even hard to transport from one site to another. The crawler's tracks offer stability to the equipment and enable the crane to function without utilizing outriggers, however, there are some units that do utilize outriggers. In addition, the tracks provide the movement of the equipment.
Early Mobile Cranes
The first mobile cranes were initially mounted to train cars. They moved along short rail lines that were specially made for the project. When the 20th century arrived, the crawler tractor evolved and this brought the introduction of crawler tracks to the construction industry as well as the agricultural business. Not long after, the crawler tracks were adopted by excavators and this further featured the equipment's versatility. It was not long after when manufacturers of cranes decided that the crawler track market was a safe bet.
The First Crawler Crane
Northwest Engineering, a crane manufacturer within the USA, was the first to mount its crane on crawler tracks during the 1920s. It described the new equipment as a "locomotive crane, independent of tracks and moveable under its own power." By the mid-1920s, crawler tracks had become the preferred means of traction for heavy crane uses.
The Speedcrane
Developed by Ray and Charles Moore of Chicago, Illinois; the Moore Speedcrane was one of the first to attempt to copy rail lines for cranes. Manufactured in Fort Wayne, Indiana, the Speedcrane was 15 ton, wheel-mounted, steam-powered crane. In the year 1925, a company referred to as Manitowoc Shipbuilding Co, from Manitowoc, Wisconsin recognized the potential and the marketability of the tracked crane. They decided to team up with the Moore brothers so as to manufacture it and go into business.
Crown has made their RC 5500 Series to concentrate on the realistic challenges experienced within the workplace. This ground-breaking model features intelligent technology and best-in-class comfort and ergonomics. Keeping the operator comfortable and safe usually leads to more efficiency.
3-Wheel Stand-Up Counterbalanced Truck
The company produces a 3-Wheel Stand-Up Counterbalanced Truck in capacities ranging from three thousand, 3500\three thousand five hundred and 4000 lb. capacity.
Performance Versatility
Crown's RC 5500 have been designed to work efficiently in a busy work setting. Whether it is operating on the dock or in an aisle, this unit achieves greatness. It has been designed to offer the operator unparalleled ride control, unmatched visibility and the ultimate ergonomics. The exclusive FlexRide technology offered by Crown provides a suspended floorboard in order to eliminate much of the shock and vibration that operators need to work with each day. Interestingly enough, many of the competitor's sit-down truck units are unable to match the lessened impact levels offered by the RC 5500 Series.
Visibility - Maximum visibility is offered for the operator from a side-stance position in both directions of travel. A low-profile offers a clear view mast as well a sculpted chassis allows the operators to be able to clearly see the fork tips, all around the truck and the fender. This optimum view enhances overall safety and reduces damage.
Speed - Through Access 1 2 3 Technology combined with the latest AC traction control, top travel speeds are among the best in the industry and achieved. Performance levels are able to be custom tuned to be able to match the operator's skill level or the application requirement.
Operator Safety & Comfort
Crown's FlexRide has a suspended floorboard that can greatly improve the overall work performance of the worker by enhancing their comfort and reducing their exhaustion. The continuous shock and vibration can lead to extreme operator exhaustion for those exposed to those motions everyday particularly during travel over dock plates, expansion joints and rough surfaces.
