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For tight spaces and high forces
LinearChain push/pull actuators
With the LinearChain push/pull actuator, you can achieve linear motion with both tensile and compressive loads over lengths of more than 10 meters (with the guided version). The push/pull chain system consists of specially shaped, high-precision mechanical links. These links can be coiled in one direction; in the opposite direction, they stiffen. This allows large loads to be moved with minimal play and high positioning accuracy.
With appropriate guide rails, the chain can be extended to any length, independent of available raw material lengths. In a chain magazine, the chain can be rolled up behind the drive to save space.
The push chain operates smoothly even under extreme temperatures. It is designed to operate reliably at low and high temperatures, up to 550 °C (special versions up to 1,050 °C). This makes it suitable for demanding environments where other systems fail.
Your advantages
Easy Maintenance
The maintenance of the Linear Chain is simpler compared to a Screw Jack, as worn parts or chain links can be quickly and easily replaced without the need to modify the entire system.
Unlimited Stroke Length
With appropriate guide rails, the chain can be extended as needed without depending on available raw material lengths.
Low Space Requirement
The Linear Chain serves as a more space-saving solution compared to a Screw Jack, as the chain is unwound.
Resistance to Heat
Operating environments with temperatures up to 250°C (482°F) are non-critical. With a special configuration, continuous temperatures of up to 560°C (1,040°F) are possible.
High Stroke Speed
Standard stroke speed up to 250 mm/s, in exceptional cases speeds of up to 1,000 mm/s are possible.
Custom configuration
Possibility to configure systems using several chains in a parallel drive geometry where higher thrust loads are required.
The Linear Chain: designed for compressive forces
The Linear Chain transmits compressive and tensile forces from 3 kN to 35 kN. A motor drives a sprocket, which in turn drives the chain, forming the chain links into a stable unit. Shoulders on the individual chain links stiffen the chain when a compressive load is applied. When a load needs to be lowered or pulled, the chain links are compactly inserted and stored in the housing.
Linear Chains are used in numerous industries and applications, including stage platforms, warehouse logistics, cooling systems, offshore applications, charging of blast furnaces, and much more.
Linear Chain SK03
Max. lifting force up to 3kN
Linear Chain SK03G
Max. lifting force up to 3kN
Linear Chain SK04
Max. lifting force up to 4kN
Linear Chain SK08
Max. lifting force up to 8kN
Linear Chain SK08G
Max. lifting force up to 8kN
Linear Chain SK12
Max. lifting force up to 12kN
Linear Chain SK18
Max. lifting force up to 18kN
Linear Chain SK18G
Max. lifting force up to 18kN
Linear Chain SK25
Max. lifting force up to 25kN
Linear Chain SK35
Max. lifting force up to 35kN
Linear Chain SK35G
Max. lifting force up to 35kN
Further details at a glance:
LinearChain’s main task is to move average and large loads in any direction (also vertically).
A sprocket wheel integrated in a drive housing actuates the chain.
A sprocket wheel integrated in a drive housing actuates the chain.
According to the thrust power, the stroke length and the speed (all individually definable), LinearChain can perform its task running on a sliding surface or in a guide rail. One of the superior advantages is the combined ability to perform high push and pull forces and fold or roll up into a magazine when retracted.
The chain drive system comprises a special housing with internal chain guides, spocket drive wheel and a keywayed drive shaft. This can be connected to a standard gear motor. Alternatively, a Framo Morat Compacta slip-on Rotary Actuator, a gear motor with integral multi-turn limit switches and optional reversing contactors or potentiometer can often be used (see separate catalogue). To prevent the Push-Chain from folding during the linear thrust motion, a special front end link is provided. This ensures that the force-line is off-center to the chain pins creating a bending moment which forces the chain fingers to lock tightly. The Push-Chain can be used for reciprocating push and pull movement, horizontally or vertically. Where possible, chain guide rails should be used to support and guide the chain.
The Guide Rail is unnecessary when:
- The Push-Chain runs across a flat surface (eg. steel plate)
- The linear travel (stroke) is within prescribed limits
- There is no danger of radial loads occurring along the thrust axis
The selection of the correct chain size and type will depend on the application, the required performance and operating criteria.
The following information is required:
- Thrust force
- Working stroke
- Linear speed
- Operating frequency
- Temperature
The Push-Chains are manufactured with a standard pitch of 25 mm, 40 mm and 60 mm (pitch is the distance between the pivot pins).
The Push-Pull Chains are manufactured from treated alloy steels. The chain can withstand temperatures of up to 356°F and for short periods even higher temperatures.
For special cases where temperatures of up to 1022°F may occur, the Push-Chain can be supplied in heat-resistant steels.
The Push-Pull Chains should not be used for applications involving the movement of loads which could endanger working personnel as a result of operation or system failure. Use of the Push-Pull Chain for personnel transport systems is not permitted without prior written approval.
We refer users to the applicable regulations and recommended practices regarding the provision of guard rails or covers to all moving parts of machines. Furthermore overhead hoist mechanisms for heavy loads using the Push-Pull Chain are not approved.
Which application would you like to implement using push/pull actuators?
Possible applications for the Linear Chain
Intralogistics
Push/pull actuators move heavy loads through tension and compression using high-precision components. The chains are made of tempered steel and can operate at ambient temperatures of up to 550 °C – with short-term exposure to temperatures of up to 1,050 °C. This makes push/pull actuators ideal for motion and positioning tasks in foundries, rolling mills, and industrial furnaces. In the image shown, batches for heat treatment are being loaded into and removed from a furnace using a LinearChain push/pull chain system.
Transport logistics
Push/pull actuators can transmit pushing and pulling forces of up to 35 kN. This enables large loads to be moved both vertically and horizontally with high positioning accuracy. In the logistics sector, this technology is used in container movers, for example. There, they transfer 7.45-meter-long semi-trailers from truck to train – and vice versa – in just a few minutes.
Automotive assembly
In the final stage of automotive production, when the car body meets the engine, precision and reliability are key. The Linear Chain provides the lifting motion for two synchronized tables used in this “marriage” process. Delivering 35 kN of lifting force with a 2,000 mm stroke, the Linear Chain ensures smooth, repeatable vertical movement within a compact, space-saving design. Its unique ability to push and pull makes it ideal for confined environments and dynamic production workflows — a brilliant solution in modern linear drive technology.