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Thomson's worm gear screw jacks MULI® and JUMBO® set new engineering standards for precision and reliability. Designed with state-of-the-art CAD and CAE systems and adhering to stringent manufacturing requirements, these screw jacks meet all the necessary safety, cost-efficiency, and durability mandates of your application.
Large projects can be realized at short notice thanks to the use of preassembled modules. These modules can be customized to your application's specifications. Above all, the heart of every MULI and JUMBO screw jack is a precision trapezoidal or ball screw drive of superb quality from Thomson's own screw production. In general, there are two considerations:
Trapezoidal screw for rough conditions and good price/performance ratio
Ball screw for long duty cycle, high efficiency, and high positioning accuracy
Not finding the screw jack you're looking for? Contact us for a custom solution.
MULI - Lifting capacities up to 100 kN
JUMBO - lifting capacities from 150 kN to 500 kN
Rotating Screw - R
The rotary motion of precision worm gearing (worm shaft and internally threaded worm wheel) is converted into axial linear motion of the screw, which travels through the gear box housing. The load is attached to the end of the screw.
Rotating Nut, with or without anti-rotation (axial translating Screw) - N or V
Driven by a precision worm gearing (worm shaft and worm wheel), the rotary motion of the screw is translated into linear motion of the travelling nut on the screw.
High Speed - One full turn of the worm shaft leads to a stroke of one millimeter. Low Speed - One full turn of the worm shaft leads to a stroke of 0.25 mm.
Ball Screw (KGS) - For longer duty cycles, higher efficiency, high positioning accuracy
Trapezoidal Screw (TGS) - For tough conditions, good price/performance ratio.
The stroke length of the screw jack.
Machining that is done to the end of the screw
Standard Screw End (only for rotating nut) (G) – the end of the screw is machined to fit a standard end fitting.
Cylindrical end (only for rotating screw) (Z) – the end of the screw is machined to a cylindrical shape
No End machining (0) – End of the screw is cut to length. No machining is added.
Special to customer specifications (S) – End of screw is machined to a customer provided specification
No end Fitting (00) – Standard for rotating screw versions.
Top Plate (BP)
Fork End (GA)
Clevis End (GK)
Bellow cover for protection against external influences. Suitable for horizontal or vertical installation.
Without Nut (0) – Always fro version rotating nut (N or V)
Trapezoidal nut (1) – for rotating screw (R) with trapezoidal screw (TGS)
Flanged ball nut (2) – for rotating screw (R) with ball screw (KGS). Flange of nut towards end of screw standard.
Cylindrical ball nut (3) – for rotating screw (R) with ball screw (KGS)
With Stop collar (A) – Collar to stop the screw from being translated out of the nut. Fitted as standard on ball screw versions N and V. Optionally available for screw jacks with trapezoidal screws. The stop collar cannot be used as a fixed stop.
Without stop collar (0) – always on rotating screw (R). Optional on rotating nut versions (N and V).
Without (0) – No special features
Standard (Z) – With some standard accessories added. These are not captured in the part number
Custom (S) – Special features as described by the customer
The diameter and lead of the screw used. On most units there is only one choice per size and type. On Muli 4 there are 2 different ball screw choices.
KGS 4005 (1)
KGS 4010 (2)
All others leave this position in the part number blank.