Explosion-proof measures: Load retention without power or brakes! Gear reducers, winches, jacks.

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SWM/SWE (winch) SRM/SRE (reducer) SLM/SLE/SLW (rack jack)

last updated：Jul 27, 2026

Winches, rack jacks, and reducers that hold loads without power or brakes are suitable for explosion-proof measures! The key points are lightweight, compact, and space-saving!

We have developed and adopted numerous application products equipped with a unique load-holding function (Shoji-lock). <Shoji-lock Product Features> - When rotation is applied from the input side, the output side decelerates and transmits power, but rotation is not possible from the output side, which means it has a self-locking function. In other words, it can hold the load at the desired position without the need for brakes. - Compared to worm gear reducers with the same self-locking function, it is highly efficient. Additionally, while the worm has input and output axes that are perpendicular, our design features input and output shafts that are in a straight line (inline), making it considerably compact, space-saving, and lightweight. - Unlike ratchets or one-way clutches, it can hold the load at any position when motion is stopped, regardless of the direction of rotation. Furthermore, there is no ratchet noise, making it suitable for use in quiet environments. - It has a basic sealed structure (equivalent to IP65), is maintenance-free, and is suitable for explosion-proof areas. - We offer a variety of application products, including gear reducers that utilize this self-locking mechanism, winches, and linear actuators (rack jacks). - Stainless steel versions are also available for cleanroom applications across various models. - There are cases where a switch from small hydraulic jacks is being considered.

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basic information

<Inline Reducer = SRM/SRE Series> - Suitable for various tasks as it can hold the workpiece during tilting and reversing. - Higher efficiency compared to worm reducers. - With the input and output shafts aligned in a straight line (inline), it is significantly more compact and lightweight than bulky worms. - Selection based on output torque; detailed lineup available in the catalog. <Winch = SWM/SWE Series> - Loads can be wound up with a handle, and the load is held when the handle is released, making it suitable for various tasks. - Unlike a ratchet, it can hold position in both forward and reverse rotation without needing to release the brake. - Available types can be driven by commercially available electric tools (drill drivers). - Manual SWM models support loads of 50 to 100 kg. - Electric (tool) SWE models support loads of 50 to 300 kg. <Rack Jack = SLM/SLE Series, SLW> - A round rack rod (commercially available) can be raised and held in place to support loads, suitable for various tasks. - Additional guide rods can be added in case buckling is a concern. - Manual SLM models support loads of 50 to 400 kg. - Electric SLE models support loads of 100 to 400 kg. - Except for some models, there are types that can be connected in pairs for simultaneous operation (without intermediate shaft).

Price information

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Delivery Time

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※Due to made-to-order production, there is no stock available. Delivery will take 1 to 4 months depending on the model.

Applications/Examples of results

Usage / Used for tilting and inverting operations as factory jigs, adopted for the opening and closing parts of furnace lids, tilting parts of mixers, tilting parts of liquid containers, opening and closing of partitions, work in places without power (using drill drivers), positioning jigs, and for use in explosion-proof areas. Track Record / Semiconductor-related, vacuum equipment manufacturers, food machinery, automotive factories, plant-related, various machinery manufacturers (mixing and powder), furnace-related, nuclear power-related, shipbuilding and marine-related, defense and military-related, conveying equipment, construction and housing-related, etc. "shoji-lock" that stops movement Not only transmits power but also assists in the basic operation of wanting to hold a load. On land... automotive manufacturing lines, semiconductor manufacturing equipment, plant-related, etc. At sea... for opening and closing ship gates, for raising underwater survey equipment, for raising and lowering the roofs of houseboats, etc. In the air... for high-altitude work equipment, for power line repair work, for industrial unmanned aerial vehicles, etc. Adopted in various situations and for various purposes. In particular, stainless steel products are widely used in the semiconductor sector. For more details, please refer to the catalog and website.

Detailed information

SLW Series SLW for 100kg: A specification that combines our winch and rack jack. The rack rod rises and falls by 11.5mm per rotation, and of course, it holds the load even when the operation stops. Compact with multiple applications! A version for 300kg is also available.
SRM Series As shown in the image, it is adopted for the tilting and flipping device. It holds the load (self-locking) when tilted, and it is very compact, which has received positive feedback.
Special Product Case 1 We handle a large number of all-stainless steel products suitable for clean rooms in fields such as semiconductors, medical devices, and food machinery, as well as in the marine sector. The photo shows an electric tool winch installed inside a seabed survey buoy. The input shaft is hexagonal, allowing it to be driven with commercially available sockets. By attaching a dedicated manual speed increaser on the opposite side of the input shaft, it becomes a hybrid type that can be quickly wound manually.
Special Product Example 2 Even with inexpensive induction motors, there are many cases where they can self-lock without the need for brakes, or are used in combination with motors that have brakes for double safety. The photo shows an aluminum construction (A7075, black anodized) for weight reduction and rust prevention.
Special Product Case 3 Achievements with a semiconductor equipment manufacturer. It is possible to manufacture a specification where the load is wound up with a belt instead of a wire, made entirely of aluminum (A7075), as shown in the photo.
Case Study 4 of Special Products Medical-related achievements. This type uses fine strings to wind up the load instead of wires. The photo shows a steel product treated with electroless nickel, which can be finished more cheaply than all stainless steel or aluminum.
Special Product Case 5 Our lineup includes the SRM-005-11, a compact inline reducer made entirely of stainless steel. The input and output shafts are neither orthogonal nor offset; they are aligned in a straight line, yet it self-locks, making it very compact. It is particularly suitable for tilting devices and similar applications.
Special Product Case 6 We have added guide rods to our SLM-050-4.0 small rack jack in our lineup, creating a twin shaft to address issues such as buckling. As shown in the photo, it is also possible to attach and manufacture flanges at both ends. Please compare it to a cigarette. It is very compact.
Special Product Example 7 The SLM-D type, which responds to the request to "raise and lower two rack rods simultaneously" in the SLM series. By connecting two rack jacks with a connecting pipe, it is possible to synchronize the two rack rods. Of course, it comes with a load-holding function and allows for a quite compact design.