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Mast Type Jib Cranes

Product Announcement from Gorbel Inc.


MT Series Cranes are available in two styles:

  • MT400 Full Cantilever - Provides maximum amount of lift where full use of available headroom is desired
  • MT450 Drop Cantilever - Jib boom can be placed at a specific height to clear overhead obstructions







Features:

  • Precision tapered roller bearings in top pivot and trunnion assemblies provide smooth operation and long life
  • Full supporting triangular base plate gussets are used (in lieu of struts) to minimize crane deflection, thus making it easier to accurately position loads
  • Independent head assembly, installed separately from the boom for easier installation
  • Recessed bearing assembly allows greatly reduced clearances needed for installation
  • Bolted head/boom connection which permits separate installation and provides maximum lift for the hoist, since it can be installed very close to the underside of the lower ceiling obstruction for greater headroom
  • In-head totally enclosed, bottom entry collector assembly allows the option of easily adding power to the hoist for 360 degree rotation at the time of or after purchase
  • Optional power rotation

Use for:

  • Circular coverage areas
  • Outdoor applications such as loading docks
  • Applications underneath large bridge cranes
  • Open areas where the jib can serve several areas
  • Machining or assembly applications where it can be overlapped with other jibs to provide staged coverage

Industry's Best Warranty - 5 years on Manual and Motorized Cranes!


Industry's Best Delivery - 5-Day Shipments available for all manually operated cranes. 2- or 3- Day Premium Service also available.

Multiple Shipping Points - We have multiple manufacturing facilities, and we ship from the closest plant to lower your freight costs and reduce product damage

"If it's late, we pay the freight" - When delivery is critical, you can depend on Gorbel®. Upon request, we will guarantee your crane will be ready for shipment on the promised date or we pay the freight

Ease of Installation - We build and assemble all components with jigs and fixtures to ensure easy installation

Ease of Operation - This helps reduce operator injuries and increase your company's productivity

Local Representation - Gorbel® Jib Cranes are sold and serviced through a network of experienced material handling specialists through North America, China, Korea, and Australia

Versatility - Gorbel® makes a complete line of jib cranes to meet your needs!

Safety - All cranes are pre-engineered for powered hoist operation - with a factor of 15% of the jib capacity for the combined weight of the hoist and trolley and an additional factor of 25% of the jib capacity for the impact of powered hoists.

Available Accessories:

  • Free Standing Series Manual Rotation Stops
  • Free Standing Series Crane Bottom Entry Collector
  • Free Standing Series Crane Top Entry Collector
  • Retrofit I Universal Motorized Kit - 1/4 ton - 2 ton, 20 ft. maximum span
  • Retrofit II Universal Motorized Kit - 3 ton - 5 ton, 20 ft. maximum span
  • Tagline Assemblies
  • Anchor Bolt Templates
  • Multi-Position Lock Device
  • Single-Position Lock Device

Anchor Bolt Load: The total amount of force that is applied to each supporting anchor bolt; usually measured in kips.

Axial Load: The total vertical force applied to the supporting structure.

Formula: Axial load = (overall weight of the crane) + (design factor x weight of load)

Boom: The horizontal beam (track) upon which the hoist trolley travels. The "jib" of the jib crane.

Bracket Center: The distance, center line to center line, between two supporting brackets of a wall mounted jib crane (i.e. the distance between the two wall mounting points).

Capacity: The maximum live weight that the crane is designed to support. For jib cranes, the design load is based on the capacity, plus a hoist and trolley allowance (15% of capacity) and an impact allowance (25% of capacity). The allowable deflection of the crane is calculated using the design load plus the hoist allowance. Load testing can be performed to 125% of rated load capacity. Standard Gorbel® jib cranes are available in capacities up to 5 tons (4536 kg).

Deflection: The difference in elevation at the tip of the boom between an unloaded crane and a fully loaded crane; usually measured in inches. Gorbel tends to have stricter deflection criteria than others in the industry.
Typical deflection of Gorbel® designs (where L = span of the crane in inches):
WC200, FS300, FS350, FS350S, MT400: L/150
WB100: L/450

Foundation: Free Standing jib cranes require that a special foundation, usually of concrete and steel, be used to support the crane and prevent the crane from tipping over. Foundation recommendations can be found in the price pages and in the installation manual.

Height Under Boom (HUB): The distance from the floor to the underside of the crane's boom. The minimum height under boom equals the height of the load, plus the maximum distance the load is to be lifted, plus the headroom required for the hoist, trolley, and attachments.

Mast: The vertical steel component of the jib crane which supports the crane. Free Standing Jib Cranes (including Work Station Jibs) have a circular pipe for a mast, Wall Cantilever Cranes have standard I-Beams, and Mast Type Cranes have wide flange beams. Wall Bracket Cranes do not have a mast.

Overall Height: The distance to the highest point on the jib crane (should include hardware). A minimal clearance (nominally 3 inches) is required from any obstructions above the boom or tie rod assembly throughout the entire rotation of the crane.

Span: For a jib crane, span is the distance from the center of the pivot point to the end of the boom. Note that "span" is greater than actual "working span" or "hook coverage."

Supporting Structure: For a Free Standing Jib Crane (FS300, FS350, FS350S) the supporting structure is the foundation which the crane is bolted to or implanted in. For a Wall Bracket or Wall Cantilever Jib Crane (WB100 or WC200), the supporting structure is the wall or column to which the crane is bolted. Mast Type Jib Cranes have a supporting structure at both the ceiling and the floor.

Thrust & Pull: Forces exerted by a crane on its supporting structure. Thrust is the pushing (or compressive) force exerted on the structure, while Pull is the tensile force. Thrust and Pull are thus equal (but opposite in direction) to each other. The maximum thrust & pull occurs when the crane is loaded at full capacity.

Working Span: The working span (or hook coverage) is less than the span of the crane. It is a function of the maximum hook reach and the ability to get the trolley close to the mast.
working span = (distance between trolley stops) - (hoist trolley length)

Features:

  • The fittings contain bronze bushings and oil-impregnated bronzy thrust washers which provide for easy rotation and superior load positioning
  • Fabricated steel fittings provide excellent torsional rigidity
  • Pre-engineered for use with powered hoists.
  • When the bracket center dimension is 6'0" or less, the mast/boom connection is welded to provide the most economical means of installation
  • When the bracket center is greater than 6'0", a bolted mast/boom connection is used, which enables the larger cranes to be shipped disassembled for ease of handling during shipping and installation
  • Optional 200° powered rotation available

Use for:

  • Hoist coverage along walls or columns
  • Individual use in bays
  • Supplement to an overhead crane or monorail system

Industry's Best Warranty - 5 years on Manual and Motorized Cranes!


Industry's Best Delivery - 5-Day Shipments available for all manually operated cranes. 2- or 3- Day Premium Service also available.

Multiple Shipping Points - We have multiple manufacturing facilities, and we ship from the closest plant to lower your freight costs and reduce product damage

"If it's late, we pay the freight" - When delivery is critical, you can depend on Gorbel®. Upon request, we will guarantee your crane will be ready for shipment on the promised date or we pay the freight

Ease of Installation - We build and assemble all components with jigs and fixtures to ensure easy installation

Ease of Operation - This helps reduce operator injuries and increase your company's productivity

Local Representation - Gorbel® Jib Cranes are sold and serviced through a network of experienced material handling specialists through North America, China, Korea, and Australia

Versatility - Gorbel® makes a complete line of jib cranes to meet your needs!

Safety - All cranes are pre-engineered for powered hoist operation - with a factor of 15% of the jib capacity for the combined weight of the hoist and trolley and an additional factor of 25% of the jib capacity for the impact of powered hoists.

Available Accessories:

  • Retrofit I Universal Motorized Kit - 1/4 ton - 2 ton, 20 ft. maximum span
  • Retrofit II Universal Motorized Kit - 3 ton - 5 ton, 20 ft. maximum span
  • Tagline Assemblies
  • Anchor Bolt Templates
  • Multi-Position Lock Device
  • Single-Position Lock Device

Anchor Bolt Load: The total amount of force that is applied to each supporting anchor bolt; usually measured in kips.

Axial Load: The total vertical force applied to the supporting structure.

Formula: Axial load = (overall weight of the crane) + (design factor x weight of load)

Boom: The horizontal beam (track) upon which the hoist trolley travels. The "jib" of the jib crane.

Bracket Center: The distance, center line to center line, between two supporting brackets of a wall mounted jib crane (i.e. the distance between the two wall mounting points).