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Corporate Literature   Product Overview Leaflet *   Contact Information *   Privacy Policy *   Location Map *   Why Choose Engineered Lifting Systems & Equipment Inc.? *   Quality Workmanship *   Fabricated Product Mentor Brand *   Mentor Power Point Presentation *   Gorbel's General Brochure *   Gorbel Ergonomic Study *   Gorbel's Jib and Gantry Brochure *   Gorbel's Interlock Brochure *   Gorbel's 5 Year Warranty *     Technical References   Crane Classifications Explained *   Examples of Crane Classifications *   FYI: Pre-Start Health and Safety Review *   CMAA Runway Specifications *   What to look for when purchasing an overhead crane.pdf *   Gorbel Designs for Seismic Zone IV *     Featured Products   Anver Mechanical Vacuum Lifter *   Mentor HD Single Girder Bridge Cranes *   Mentor Transfer Car On Rail *     Corporate Links   Anver Corp.   Caldwell Group Inc.   CAN Integrate   CanStahl   Columbus McKinnon Corp.   Gorbel Inc.   Kito   Lift and Move   Schlumpf   Schmalz Inc.   Unidex Inc.     Technical Links   Material Handling Industry of America   ASME Codes & Standards   Canadian Standards Association   Ontario's Occupational Health and Safety     Key Words and Definitions          Bridge Crane is the entire assembly as a functioning unit of end trucks, beam, trolley, hoist, electrification, control panel, end stops, bumpers, drives, gear boxes and festooning.          Bridge crane span is the distance from center of rail on one runway to center of rail on other runway side. For under running cranes, this dimension if measured from the runway beam centers as apposed to rail centers.          Deflection is the relative vertical displacement of a member or part. For bridge cranes that value is considered for total load conditions (I.e. lifted load + trolley weight + bridge dead load).          Vertical Deflection Criteria is a maximum permissible deflection ratio allowed for a lifting device. For bridge cranes this value is L/600 and for jibs this value is R/300, where L is the span of a bridge crane and R is the reach of a jib crane.          Horizontal Deflection Criteria is a maximum permissible deflection ratio allowed for a bridge crane or runway. Mentor designs for a maximum lateral deflection for runways and cranes of L/400.          Duty Class is a method of distinguishing the usage of a crane, from a load and/or cycle point of view. See Crane Classifications Explained in the Technical References section above.          End Trucks are the structural/mechanical units that the main bridge girder is supported by.          Equivalent durability wheel load is used to express the wheel loads that account for duty rating and wheel RPM. This value is generally less the service wheel load.          Festoon pendent (I.e. festooning) is a free floating pendent cable that allows users the freedom to move independently from a product being lifted.          Hook Approach is defined as the closest position horizontally that a hoist hook may be to the runway centerline.          Jib cranes are a type of crane that allows for rotational movement along with horizontal trolley motion and vertical hoisting motion. Jibs are normally mounted to a column or are free standing.          Rated Capacity is the maximum allowable load that can be safely lifted by a device without exceeding any design safety factors or fatigue limits.          Top Running cranes run on crane rails mounted on runway beams. Mentor supplies these cranes up 60 Ton capacities and 100 Ft Spans.          Under Running cranes run on the lower flanges of runway beams. Local flange stresses due to runway wheel loads is considered by Mentor when designing runways beams. Mentor supplies these cranes up to 20 Ton capacities and 60 Ft. spans.          Wheel load is defined as the service load for which the end truck wheels will experience when lifting the rated load.   * Requires Acrobat Reader. To download, use the link below.