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| New line of Center-Lock Pin-Grabber couplers in Europe  Caterpillar Work Tools B.V. introduced its new line of Center-Lock Pin-Grabber couplers for Cat hydraulic excavator models 311 through 345 in the UK, Germany and France. The new Caterpillar Center-Lock Pin-Grabber coupler uses a patented over-center locking mechanism and two hydraulic locking features to assure positive work-tool attachment. The new coupler's triple-lock design promotes jobsite safety and allows operators to quickly, simply and confidently engages and disengages work tools regardless of boom and stick position. The Center-Lock coupler accommodates the same range of Cat work tools as previous pin-grabber couplers, as well as a broad range of competitive buckets and tools.When the operator uses the in-cab switch to engage the Center-Lock coupler with a work tool, the coupler's robust cylinder extends to close the primary hook around the tool's rear pin. As the cylinder rod continues to exert force on the rear pin, the cylinder housing adjusts its position and forces a combination of three attached parts—center-lock rocker, connector link and secondary lock—to snap into an over-center position (much like closing the handles of locking pliers). This action forces the secondary lock to clamp the forward pin. Once the coupler locks, the mechanical principles involved in its over-center locking technology assure that any working force applied to the pins will serve only to increase the coupler's grip. Constant hydraulic force exerted by the cylinder and the action of a counterbalance valve provides additional locking forces, supplementing that of the mechanical lock. The Center-Lock coupler remains positively closed until the operator takes the deliberate action of activating the in-cab switch and extending the bucket cylinder. The over-center mechanism then releases (as when opening the handles of locking pliers). For the operator's convenience and for jobsite safety, the secondary lock is distinctly visible from the cab and provides an unmistakable indicator of the coupler's status—whether locked or unlocked. "Because the new Center-Lock coupler eliminates the blocking bar and spring pack required with conventional pin-grabber designs, the operator no longer needs to completely curl the boom and stick (thus inverting the coupler) when engaging a work tool" said David Becktel, Commercial Manager, Caterpillar Work Tools B.V. "The Center-Lock design requires only that the bucket cylinder be extended to activate locking and unlocking functions, whereas this action is independent of boom and stick position. The resulting advantage is that the operator can engage and disengage tools with the boom and stick at full extension, a valuable feature when changing tools in low-overhead situations, such as near power lines". Maintaining the new Center-Lock coupler requires only daily greasing. To promote trouble-free operation, jumper-line routing helps avoid pinching or snagging on jobsite hazards. All Caterpillar hydraulic work tools use Cat HYDO Advanced 10 oil. This specially selected and controlled higher quality based oil provides longer life, extended temperature range, and overall system protection. Caterpillar supports its work tools with a comprehensive range of pre- and after-sales services that cover everything from advice on work tool selection to operator training, equipment management, and a range of financial and insurance products. write your comments about the article :: © 2010 Construction News :: home page |