WHY A JIB CRANE?
Today�s industry demands versatile, efficient, and cost effective equipment while at the same time providing more flexibility along with significant savings through increased productivity. A jib crane can help improve materials handling efficiency and work flow. Serious consideration should be given to jib cranes for applications requiring repetitive lifting and transferring of loads within a fixed arc of rotation.
HOW TO CHOOSE THE RIGHT JIB CRANE
In selecting a jib crane to match your individual requirements and application, thought should be given to operation type, available structure, necessary options, and cost of both the unit and installation. The following factors should be considered in order to choose a jib crane for maximum effectiveness at minimum cost.
� Capacity: The maximum weight of the application should match, NOT exceed, design weight. The capacity rating is based on a design load which includes the capacity rating of the crane plus 15% of the capacity for the weight of the hoist and trolley, 25% of the capacity as an allowance for impact. The deflection is based on a design load which includes capacity plus 15% of capacity for the hoist and trolley. The SPANCO design criteria allows the least amount of deflection so as not to hamper the performance of the crane.
� Area of rotation: Free standing and mast type jib cranes offer 360° rotation. Wall mounted types offer 200° rotation.
� Underboom height: Distance from the floor to the underside of the boom. The size of the hoist and the amount of lifting distance should also be considered.
� Overall height: The height to the highest point on the crane after installation. Any attachments, such as electrical entry, should also be considered to provide full rotational potential of the crane, and to be free of overhead obstructions.
� Working span: Amount of actual working area needed. The working distance or hook distance is approximately one-half the trolley length from the end of the beam, and also is the same distance from the head assembly or vertical support member of the jib.
� Power-motor requirement: How much power is necessary? Is the power for rotation, trolley, hoist, or all three? (standard powered jib rotation is approximately 1/2 r.p.m) How will the power be supplied? Bottom or top entry? Electric or air? Finally, does the system need to be weatherized or is it for indoor use?
� Installation: Can the crane be assembled easily to reduce cost? The location will also dictate the type of crane to be selected to insure proper installation. Free standing jibs require reinforced concrete foundations which can cost more than the crane itself.
WARNING: This equipment is not, in any way, designed for lifting, supporting, or transporting humans. Failure to follow the specified load and mountinglimitations can result in serious bodily injury and/or property damage.
FREE STANDING JIB CRANES
� 360° rotation.
� Allows for electrified, motor driven, powered rotation through various collector ring assemblies.
� The boom or I-beam is designed to meet all specifications utilizing a 25% factor of rated load for impact and 15% of rated load for hoist and trolley weight.
� The pipe mast or column is designed to give maximum strength and minimum deflection to resist bending, buckling, and crushing as well as wear by the trunnion roller assembly.
� The top bearing assembly utilizes a Timken tapered roller bearing provided with a grease fitting for proper lubrication.
� The bearings are designed for a 5000 hour, B-10 design life.
� Constructed of standard plate, angles, and channels to ensure minimum deflection and maximum rigidity.
� The plates are reinforced using angles to limit compression and buckling stresses.
� The lower trunnion roller assembly is mounted on a channel which transfers the load from the top of the box.
� The head assembly is designed to inhibit dislodgment due to upward and forward motion. It allows bottom entry electrification inside the head and will also allow mounting above the boom for top entry electrification.
� SPANCO free standing jib cranes are designed to be mounted to a permanent concrete foundation which, in addition to anchoring the crane, acts basically as a counterweight for the forces exerted by the crane under maximum loading conditions. The recommended foundations are based on a soil pressure of 2,500 lbs. per sq. ft., so it is possible in some cases to reduce the foundation size if it is determined to be feasible by a qualified architect or engineer.
� It is solely the customer�s responsibility to provide the proper foundation for the crane so there should be no deviation from the recommended foundation size without first consulting a qualified professional.