Client Name
Bespoke Fabrications
Date
14-11-2024
Client Location
Derby
Duration
2 days installation
Workers
Engineers Robert Sowerby, John Moore
Job
Fabrication
Product / Title
1 x 5 Tonne Twin Beam Crane fitted with a Morris crab unit
Safe working load
5,000 kg
Span
15 meters
Manufacturer
Cobal
Crane Type
Double beam
Height of lift
5 metres
Hoist type
Wire rope Crab unit
Hoist speed
Dual
Cross travel
Dual
Long travel
Dual
Control
Pendant
Radio control
No
Environment
Indoor normal use
Finish
Yellow gloss to BSOE851
Steel work
Existing steelwork
Conductor System
The bus bar system that feeds the crane was 24 meters long and come complete with mounting brackets and one set of current carrying collectors. The system is a new four bar finger proof one.
Dispatch/Delivery/
Was installed on the planned date as requested,
Complications/
Nil
Customer Feedback
E-Mail sent from site
Many thanks for the supply and install of our crane, it has sped up our production massively already.
What is a crab unit?
The term “Morris Crab Unit” most commonly refers to a component used in overhead material handling equipment, specifically a type of hoist trolley manufactured or supplied by a company associated with the Morris name (like Morris Material Handling, or the historical Herbert Morris company).
Here’s a breakdown:
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Crab Unit: In the context of cranes and material handling, a “crab” is the assembly that carries the hoist (the mechanism that lifts the load) and travels horizontally along the bridge or girders of an overhead crane. It allows the load to be moved across the width of the building.
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Crab units are typically used on double-girder overhead cranes.
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Morris: The name “Morris” is connected to several historical and modern engineering companies, most relevantly Herbert Morris Ltd. (later Morris Material Handling), which has a long history of manufacturing cranes, hoists, and lifting equipment in the UK.
Therefore, a Morris Crab Unit is a wire rope hoist or lifting mechanism mounted on a trolley assembly designed to traverse the main beams of an overhead crane, and it was produced by a company bearing the Morris name. Different types of crab units exist, such as:
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Standard Crab Unit (Type D): A compact design for medium safe working loads (SWL).
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Low Headroom Crab Unit (Type DA/DQA): Designed to minimise the space required above the crane for installation, maximising the height of lift.
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Twin Barrel Crab Unit (Type Z): Used for heavy-duty or very high load applications.