No more searching for parking spots: How the Tower Chain parks vehicles in a space-saving way

Amid the parking chaos of Los Angeles, an innovative parking system demonstrates how the Tower Chain moves cars safely and space-efficiently into multi-level parking areas.

Philipp Schmalzhaf

by Philipp Schmalzhaf, Sales Manager

Automated Parking system

Intelligent parking solution for overcrowded cities

Marina Del Rey in Los Angeles — a city of endless possibilities. At the same time, it's also synonymous with frustrating parking challenges, presenting drivers with the same daily struggles: endless searches for a parking space, frantic gestures, and the constant risk of scratches caused by tight parking spots.

This is where the AUTOParkit™ system from Dasher Lawless comes into play: Drivers simply move their vehicle into the entry station, hand over the key, and let the technology and control system handle the entire parking process. Within seconds, the platform lifts, and the vehicle moves quietly into the depths of multi-level parking areas — eliminating the search for available parking spaces and making parking damage a thing of the past.

Tower Chain used for automated parking

Cars are parked safely and space-efficiently using a linear chain system

The role the Tower Chain plays in this solution

The key to this seamless parking experience is the innovative drive system hidden beneath the concrete base: the Tower Chain - a linear chain system from GROB Drive Technology. Originally, a more cost-effective solution using steel cables could have been considered. However, the limited ceiling height within the underground parking structure made this approach impractical, and the building structure would've been exposed to excessive tensile loads. The engineers therefore chose a floor-mounted design for the chain housings. With this setup, the Tower Chain modules push the platform upward from below, transferring the load directly into the foundation slab while eliminating the need for expensive ceiling reinforcements.

Basement floor plan - parking garage

The high load capacity of each individual chain link allows vehicles weighing well over 5 tons to be lifted while ensuring an even distribution of forces at all times. The compact height of the linear chain housings makes it possible to install the system in tight spaces, significantly reducing the required installation space compared to conventional solutions. Without cable slack or the risk of slipping, the lifting mechanism operates smoothly, reducing wear on mechanical components while increasing user confidence in the system.

The Tower Chain modules also demonstrate their strengths when it comes to maintenance. Thanks to the modular chain link design, worn components can be replaced quickly without having to disassemble large assemblies. The lubrication concept ensures long maintenance intervals between service cycles. Combined with a sophisticated safety management system in accordance with the machinery directive, this creates a reliable operating concept that transforms everyday parking operations while significantly reducing operating costs.

Tower Chain with description

How the Tower Chain system works

Tower Chains consist of high-precision chain links with lateral shoulders that mechanically interlock under axial loads, converting compressive forces into lifting motion. A sprocket inside the drive housing pulls the links out of a magazine, where they lock together to form a rigid column. During the unloaded return movement, the chain runs like a conventional chain over guide rollers and is stored compactly in a return system. This allows for virtually unlimited lengths of fast and highly precise linear motion - even in tight installation spaces. In this application, the chain is stored behind the lifting movement, creating a self-supporting lifting column.

With floor-mounted installation and powerful linear chain technology, AUTOParkit™ takes automated parking logistics to the next level. The result: maximum parking space utilization, reduced operating costs, and uncompromising safety.

FAQs about Linear Chains

A Linear Chain is a type of chain that can be both pulled and pushed. When the chain links are pushed together, they stay stable and rigid, allowing you to move things forward. It’s often used in machines to lift or push objects.

What a Linear Chain is and where it is used - GROB GmbH chevron_right

The chain of the Linear Chain consists of links that rest on the shoulders and pins of the succeeding link. The chain of the Tower Chain is constructed with U-shaped chain links, providing greater stability and enabling unguided strokes of over 4m.

Depending on the size, the driving speed is usually below 50rpm.

Yes, lifting systems with multiple chains connected together are common.

In standard applications, Linear Chains can be operated with a speed of 250mm/s. Special applications have already been implemented with speeds exceeding 800mm/s.

Yes, the use of stainless steel materials is a common practice for environments with aggressive media.

Yes, depending on the proximity to the product, the chain can also be completely made of stainless steel.

  1. When under pressure load: depending on the control, 100% repeatability can be achieved.
  2. Under changing loads: the control system must consider the backlash at the sprocket and manufacturing tolerances in the chain links.
  1. The load must always be guided
  2. Acceleration should be controlled via a ramp
  3. The chain cannot perform a swiveling movement
  4. The permissible buckling length must not be exceeded

No, within the buckling range, Linear Chains can also be used without guidance.

  1. Electronic bridge: If each lifting element of the system is driven by a motor, electronic synchronization can be achieved through encoders.
  2. Mechanical linkage: More cost-effective and fail-safe are cardan shafts and bevel gearboxes, which can connect all lifting elements of a system together.

The polygon effect occurs when a chain is positively driven by a sprocket. In this case, the chain cannot run perfectly circularly on and off the sprocket, causing deviations in the path of the traction medium. The speed of the chain then fluctuates periodically around a mean speed, which can manifest as vibrations in the chain.

Since the chain undergoes radial movement due to the polygon effect, the guide plates are extended, and minimal play is allowed. This helps mitigate this effect.

No, swiveling movements are not possible with the Linear Chain.

65% with chain magazine, 80% with free chain.

No, the load must always be guided.

There is no calculation basis for this. The buckling length has been determined through tests. You can find a corresponding diagram for horizontal applications here: General Catalog 2023 (grob-antriebstechnik.de). For vertical applications, please contact us.

No, a Linear Chain can never take over the guiding itself. The load must be guided.

  1. Lubrication system: attached lubrication brushes extend the lifespan.
  2. Chain magazine: the chain can be rolled up behind the housing.
  3. Reduction gear: especially useful in lifting systems to reduce torque through gears.
  4. Force sensor: for measuring axial load and protection against overload.

We always recommend using our standard link to connect your load. Utilize all the holes to ensure proper loading of the chain. Dimensions for the front link can be found here: General Catalog

As standard, GROB chains are galvanized. For environments with aggressive media, stainless steel chains can be used.

  1. Standard: 180°C (356°F)
  2. High-temperature continuous: 550°C (1022°F)
  3. High-temperature short-term (under 2 minutes): 1050°C (1922°F)
  1. The load must be guided
  2. The Linear Chain size must be chosen correctly
  3. It should be driven over a ramp

Yes, hardened chain links achieve a lifespan four times longer.

  1. A chain magazine winds the chain in multiple circular paths. Advantage: greater space saving.
  2. A chain cover protects the chain attached to the housing. Due to the attachment, the chain aligns itself and thus halves the stroke length. Advantage: more cost-effective.

Yes, the chain can be stored perpendicular to the lifting movement, such as 90°, or even 180° (parallel) to the lifting movement, as in the case of tool tables. The lift then operates on the table, while the storage runs parallel underneath it.

The T-guide was developed when space for the standard rail above the sliding surface was lacking. In one application example, the customer needed to maneuver with a forklift. The T-guide rail was then embedded in the floor, allowing the vehicles to continue maneuvering undisturbed.

No, you should provide a brake on the motor.

Check for dirt or worn-out parts. Thorough cleaning and, if necessary, replacement of damaged components may solve the problem. If the Linear Chain is noisy after acquisition, system tensions could be responsible.

The different installation positions do not affect the usability of Linear Chains (e.g., through oil sight glasses or similar). By simply changing the mounting side of the mounting brackets, the mounting sides can be adjusted as needed.

There's no calculation basis for this. Tests have shown that for standard chains, 250,000 cycles, and for hardened chains, 1,000,000 cycles represent realistic values.

Question not included?

You can find more application examples and drive solutions here

Linear Chain - GROB GmbH Antriebstechnik

What is a Linear Chain?

Want to understand how Linear Chains work? This introductory article covers the basics, explains the technology behind them, and shows where they are used. Learn why Linear Chains are a reliable solution for precise linear motion in a wide range of applications.

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Thomas Möschle - GROB Drive Technology

Thomas Möschle, Key Account Manager