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  1. Home
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  3. 庄司歯車エンジニアリング
  4. We will provide an explanatory booklet: Why does it stop? The secret of the new self-locking deceleration mechanism 'shoji-lock'
CATALOG
  • Jun 12, 2013
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Jun 12, 2013

We will provide an explanatory booklet: Why does it stop? The secret of the new self-locking deceleration mechanism 'shoji-lock'

庄司歯車エンジニアリング 庄司歯車エンジニアリング
A completely new inline reducer that self-locks despite being a spur gear instead of a worm gear. Why does it self-lock? What is the internal structure like? We often get asked these questions. While showing a demo unit or a cut model can help people understand, such opportunities are rare. Therefore, we created a simple explanatory document. Please take a look at this, and if you're interested, feel free to check out our specific products and contact us.
Inline reducer for ingot lifting device.
Inline reducer for ingot lifting device.
Stainless steel winch (with lock release function) for clean rooms
Stainless steel winch (with lock release function) for clean rooms
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Jack 50KN manual/electric rack jack with self-locking function

A jack that can lift a load of 50 kN with a light manual operating force (input shaft torque of approximately 11 Nm). This is an application product of the new self-locking mechanism (Shoji Lock).

This is a jack developed for component maintenance. It is a manual jack with a high-efficiency self-locking mechanism utilizing spur gears, featuring the Shoji lock. The main body weighs 36 kg and is made of aluminum, designed with a focus on lightweight and manual operability. It has two input shafts (high/low), allowing for easy switching between quickly turning the handle when there is no load and applying force when there is a load, simply by changing the insertion of the handle. It can be widely used for work in areas without power, as well as for disaster preparedness and energy-saving measures. It can also be used electrically.

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[Stainless Steel Specification] Small Manual Self-Locking Winch 50kg

A stainless steel type of winch with a compact, lightweight, and sleek appearance has been introduced, featuring a self-locking function that can hold the load even when the operator's hands are off during operation.

The compact and lightweight winch "S-Winch," equipped with the already well-received new self-locking mechanism (Shoji-Lock), now comes in a rust-resistant stainless steel type. Due to high demand for compatibility with clean rooms, we have prepared a model with a maximum rope pulling force of 50 kgf. It achieves a compact and lightweight design with a sleek appearance, allowing for space-saving. It can rotate in both forward and reverse directions and locks in place when stopped. It can be widely used as a disaster response and energy-saving measure without the need for a power source. Additionally, since it is not a ratchet type, it can be used in various locations and operates very quietly, making it suitable for nighttime work and hospitals. Being made entirely of stainless steel, it can be used not only in clean rooms but also in marine and ship-related applications.

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Best-selling small winch: Manual self-locking winch 50kg

It is safe because the luggage will not fall even if you take your hands off the handle during operation. Furthermore, the main unit is compact and lightweight, allowing for space-saving.

The "S-Winch," a compact and lightweight winch equipped with a new self-locking mechanism (Shoji-Lock), is the best-selling model with a maximum rope pulling force of 50 kgf. It achieves a compact and lightweight design with a sleek appearance, allowing for space-saving. It can rotate in both forward and reverse directions and locks in place when stopped. It can be widely used in areas without power, as well as for disaster preparedness and energy-saving measures. Additionally, since it is not a ratchet, it operates very quietly, making it suitable for nighttime work and environments such as hospitals and stage equipment.

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Small winch manual/electric type self-locking winch 100kg

While winding up the load, it is safe as it does not fall even if the movement stops. No brakes are needed, so it can be wound up with an electric screwdriver. It is ideal for work in places without power.

The "S-Winch" is a compact and lightweight winch equipped with a new self-locking mechanism (Shoji-Lock). It is available in both manual and electric types, capable of handling a maximum rope pulling force of 100 kgf. It achieves a compact and lightweight design with a neat appearance, allowing for space-saving. It can rotate in both forward and reverse directions and holds the load when the movement is stopped. This enables operation with an electric screwdriver, making it suitable for use in areas where a large power supply is not available, as well as for disaster preparedness and energy-saving measures.

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Jack, rack type (without screws), manual with self-locking function, 50 kgf.

Faster and more efficient compared to screw jacks. It can be operated quickly and lightly by hand, has a compact design, and can hold loads without the need for a stopper, making it highly safe.

Unlike conventional screw jacks, this rack-type jack features an overwhelmingly fast rise and fall speed due to its high efficiency, making it easy to operate. It is also equipped with a unique self-locking mechanism that allows it to hold loads without brakes or stoppers, making it a groundbreaking jack. With a rated thrust load of 50 kgf, it can be operated manually with ease, advancing exactly 4 mm per rotation, which also makes it a round-number linear jack. Its significant advancement makes it a highly versatile rack jack and linear actuator. (For more details, please refer to catalog frame number SLM-050-4.0) *For more information, please visit our official website or feel free to contact us.

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Jack, rack type (without screws), manual self-locking function, 100 kgf.

Faster and more efficient compared to screw jacks. It can be operated quickly and lightly by hand, has a compact design, and can hold loads without the need for a stopper, making it highly safe.

Unlike conventional screw jacks, this rack-type jack features an overwhelmingly fast ascent and descent speed due to its high efficiency, making it easy to operate. It is also equipped with a unique self-locking mechanism that allows it to hold loads without brakes or stoppers, making it a revolutionary jack. The rated thrust load is 100 kgf, and it can be easily operated manually, advancing 3.2 mm per rotation, making it a highly versatile rack jack and linear actuator. (For more details, please refer to catalog frame number SLM-100-3.2) *For more information, please visit our official website or feel free to contact us.

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Jack, rack type (without screws), manual self-locking function, 200 kgf.

Faster and more efficient compared to screw jacks. It can be operated quickly and easily by hand, has a compact design, and can hold loads without the need for a stopper, making it highly safe.

Unlike conventional screw jacks, this rack-type jack features an overwhelmingly fast ascent and descent speed due to its high efficiency, making it easy to operate. It is also equipped with a unique self-locking mechanism that allows it to hold loads without brakes or stoppers, making it a revolutionary jack. With a rated thrust load of 200 kgf, it can be operated easily by hand, advancing exactly 3 mm per rotation, which also allows it to function as a round-number linear jack. Its significant advancement makes it a highly versatile rack jack and linear actuator. (For more details, please refer to catalog frame number SLM-200-3.0.) *For more information, please visit our official website or feel free to contact us.

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Jack, rack type / no screws used, self-locking electric/manual 100 kg

Compared to screw jacks, this is a hybrid type that can be operated with commercially available electric tools due to its high speed and efficiency, and it can also be operated manually by attaching a handle.

Unlike conventional screw jacks, this rack-type jack features an overwhelmingly fast ascent and descent speed, characterized by its lightweight operability due to high efficiency. Therefore, it can be operated quickly with common electric tools (drivers/drills). Additionally, it is equipped with a unique self-locking mechanism that allows it to hold loads without brakes or stoppers, making it a revolutionary jack. Moreover, it boasts excellent strength and durability while being designed to be lightweight and compact. It also employs an omnidirectional actuator that can accommodate upward, downward, and lateral movements. It is well-suited for rack-type electric cylinders and has a rated thrust load of 100 kgf. *For more details, please visit the official website or feel free to contact us.*

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Jack, rack type / no screws used, self-locking electric/manual, 200 kg

Compared to screw jacks, this is a hybrid type that can be operated with commercially available electric tools due to its high speed and efficiency, and can also be operated manually with a handle attached.

Unlike conventional screw jacks, this rack-type jack features an overwhelmingly fast rise and fall speed due to its high efficiency, making it easy to operate. As a result, it can be operated quickly with common electric tools (drivers/drills). Equipped with a unique self-locking mechanism, this revolutionary jack can hold loads without brakes or stoppers. It is not only strong and durable but also designed to be lightweight and compact. Additionally, it employs an omnidirectional actuator that can accommodate upward, downward, and lateral movements. It is also ideal for rack-type electric cylinders, with a rated thrust load of 200 kgf and a reduction ratio of 63. *For more details, please visit our official website or feel free to contact us.

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庄司歯車エンジニアリング
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Hyper CLT flooring panel

Wooden flooring that supports the ease of walking for workers | Hyper CLT flooring

  • NEW
  • PRODUCT

In civil engineering sites, workers stand for long periods and move around the site multiple times. Muddy and uneven ground makes walking difficult, leading to strain on the feet and back, as well as an increased risk of falls, so ensuring a stable work path is important. Hyper CLT mats are civil engineering CLT materials that utilize laminated CLT wood. By laying them down in areas such as temporary roads, material storage sites, assembly areas, break areas, and worker pathways, they help reduce unevenness and mud, creating a more walkable environment. They possess surface characteristics unique to wood, providing a walking environment that differs from metal plates. The 5×10 panel weighs about 230 kg, and the 5×20 panel weighs about 460 kg, making them lightweight and easy to handle even with small machinery, which helps reduce the burden of installation and removal. Additionally, they can be used to address environmental concerns such as glare reduction, noise reduction, and CO2 fixation, as well as measures against heatstroke. They are recommended for creating worker-friendly sites and innovative public works as a registered technology with the Ministry of Land, Infrastructure, Transport and Tourism under NETIS "TH-250021-A."

Aug 08, 2026

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Please take a look at the technical document for the leak test, the "Technical Manual"!

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  • CATALOG

Fukuda Co., Ltd., which develops, manufactures, and sells leak testing equipment to inspect airtightness and sealing performance, provides a technical document that clearly explains the methods and theories of airtight testing, titled "Technical Manual." We are offering it as a PDF file. Please take this opportunity to download and view it!

Aug 07, 2026

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Fukuda's leak test, leak inspection, leak detection, leak test, integrity test.

  • NEW
  • PRODUCT

Fukuda Co., Ltd. has been pursuing leak detection for 60 years and is committed to advancing the future of leak testing. 【 Supporting Various Leak Tests: Air Leak Test / Gas Leak Test (Hydrogen Gas, Helium Gas) 】 We develop, manufacture, and sell leak testing equipment to inspect airtightness and sealing properties. We will propose the appropriate testers and devices for each inspection target. 【 Target Industries and Examples of Inspection Targets 】 - Automotive Industry: Engines, FC components, valves and piping, various parts - Electronic Components Industry: Smartphones, keyless switches, various small sensors - Pharmaceuticals / Food / Cosmetics Industry: Bottle containers, syringes, vials, eye drop containers, pillow packaging, PTP packaging We will propose the most suitable leak testers for each industry. 【 ISO Certification 】JIS Q 9001:2015 (ISO 9001:2015)

Aug 07, 2026

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Hyper CLT flooring panel

Wooden CLT flooring for foot protection during rainy weather | Hyper CLT flooring

  • NEW
  • PRODUCT

In civil engineering sites, due to the effects of rain and mud, temporary roads, access routes, and heavy machinery work yards can become slippery. To ensure the safety of vehicles and workers, it is important to choose appropriate mats for the site conditions and to improve the footing environment. Hyper CLT mats are civil engineering CLT materials that utilize laminated timber. They possess surface characteristics unique to wood and can provide a non-slip footing environment that differs from metal steel plates. They can be used in a wide range of civil engineering sites, including temporary roads, vehicle entrances and exits, mud prevention, ground protection, heavy machinery scaffolding, and worker pathways. The 5×10 panel weighs approximately 230 kg, and the 5×20 panel weighs about 460 kg, making them lightweight and easy to handle even with small machinery, which contributes to labor-saving in installation and removal. It should be noted that slipperiness can vary depending on weather, slope, mud or oil adhesion, and installation conditions, so on-site verification and appropriate maintenance management are necessary. This wooden mat is registered as a technology with the Ministry of Land, Infrastructure, Transport and Tourism under NETIS as "TH-250021-A" and can be utilized for safety measures and creative ideas.

Aug 07, 2026

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Please let us know your concerns regarding leaks. We may have some suggestions for you. Leak tests, leakage tests, leak inspections, leak detection, container integrity tests, packaging integrity tests...

  • NEW
  • PRODUCT

Fukuda Corporation has been pursuing leak detection for 60 years and is dedicated to advancing the future of leak testing. 【 Supporting Various Leak Tests: Air Leak Test / Gas Leak Test (Hydrogen Gas, Helium Gas) 】 We develop, manufacture, and sell leak testing equipment to inspect airtightness and sealing performance. We will propose suitable testers and devices for each inspection target. 【 Target Industries and Examples of Inspection Targets 】 - Automotive Industry: Engines, FC components, valves and piping, various parts - Electronic Components Industry: Smartphones, keyless switches, various small sensors - Pharmaceuticals / Food / Cosmetics Industry: Bottle containers, syringes, vials, eye drop containers, pillow packaging, PTP packaging We will propose the most suitable leak testers for each industry. 【 ISO Certification 】JIS Q 9001:2015 (ISO 9001:2015)

Aug 07, 2026

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