- CATALOG
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
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.
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Shoji Gear Engineering HomepageRelated product information
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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).
【Features】 ○Safety →Simple structure that is less prone to failure, preventing operational mistakes ○Simple and space-saving ○Quiet operation (no ratchet noise) ○Robustness that sets it apart from others ●For more details, please contact us or download the catalog.
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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.
Maximum rope pulling force: 50 kgf, lifting amount per rotation: approximately 13 mm, input torque at maximum load: approximately 3 Nm, handle operation force: approximately 2.8 kg (handle diameter: 120 mm), wire winding length: approximately 5 m (φ3 mm), body weight: 2.1 kg. 【Features】 - Holds the position when operation is stopped. - Compact, lightweight, and economical. - Excellent strength and durability. - Operates quietly without ratchet noise. - Simple structure that is less prone to failure and prevents operational mistakes. - Easy electric operation with one-touch (Electric/Manual Winch SWE). 【Other Features】 - Drum that does not require a specific winding direction for the rope. - Unique holding mechanism sealed within the drum for quiet and powerful operation. - Input shaft that maintains the stopped position regardless of rotation direction. - Smooth operation handle without ratchet. - Compact and lightweight tube-shaped case that allows for flexible installation direction. - Made entirely of stainless steel, allowing for wide-ranging applications (food, medical, hospitals, clean rooms, marine, ships, etc.).
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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.
Maximum rope pulling force: 50 kgf, lift amount per rotation: approximately 13 mm, input torque at maximum load: approximately 3 Nm, handle operation force: approximately 2.8 kg (handle diameter: 120 mm), wire winding length: approximately 5 m (φ3 mm), body weight: 2.1 kg. 【Features】 - Holds the position when operation is stopped. - Compact, lightweight, and economical. - Excellent strength and durability. - Operates quietly without ratchet noise. - Simple structure that is less prone to failure and prevents operational mistakes. 【Other Features】 - Drum that does not require a specific winding direction for the rope. - Unique holding mechanism sealed inside the drum for quiet and powerful operation. - Input shaft that maintains the stopped position regardless of rotation direction. - Smooth operation handle without ratchet. - Compact and lightweight tube-shaped case that allows for flexible mounting direction.
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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.
In the case of a reduction ratio of 64, the maximum rope pulling force is 100 kgf, the lifting amount per revolution is approximately 2.5 mm, the input torque at maximum load is approximately 0.9 Nm, the wire winding length is about 5 m (φ3 mm), and the body weight is 2.6 kg. 【Features】 ○ Holds the position where the operation is stopped. ○ Compact, lightweight, and economical. ○ Excellent strength and durability. ○ Operates quietly without ratchet noise. ○ Simple structure that is less prone to failure and prevents operational mistakes. ○ Easy electric operation with one-touch (Electric/Manual Winch SWE). 【Other Features】 ○ Drum that does not require a specific winding direction for the rope. ○ Unique holding mechanism sealed inside the drum for quiet and powerful operation. ○ Input shaft that maintains the stopped position regardless of rotation direction. ○ Handle that operates smoothly without a ratchet. ○ Compact and lightweight tube-shaped case that allows for flexible mounting direction. ○ Hexagonal shaft that can easily attach and detach from commercially available electric tools or separately sold manual handles. ○ Available in all stainless steel or aluminum (supports loads of 30 kgf). ○ Optional release mechanism for quickly releasing the wire when needed.
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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.
Fixed thrust load of 50 kgf, advance per rotation of 4 mm, input torque of approximately 1.6 Nm at maximum load, manual handle operating force of about 2.4 kg (handle diameter 70 mm), applicable round rack rod φ10, body weight of 0.9 kg (excluding rack). 【Features】 ○ Holds the stopping position of the rack rod. ○ Compact, lightweight, and economical. ○ Excellent strength and durability. ○ High efficiency, can be operated smoothly both manually and electrically. ○ The reduction gear section is maintenance-free and does not require oil changes. 【Other Features】 ○ Input shaft that holds the stopping position without a stopper. ○ Low friction and highly durable micro-tooth differential compound cycloidal mechanism. ○ Simple and robust machined case. ○ All-direction actuator capable of vertical lift, push, pull, and lateral movement. ○ Equipped with Shoji lock for safety, labor-saving, and space-saving. ○ Rack-type lifting shaft that is strong against buckling and does not require a stop. ○ Reversible design that can be mounted on either side. ● For more details, please request documentation or 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.
Fixed thrust load of 100 kgf, advancement per rotation of 3.2 mm, input torque of approximately 2.9 Nm at maximum load, manual handle operation force of about 2.4 kg (handle diameter 120 mm), applicable round rack bar φ15, body weight of 1.7 kg (excluding rack). 【Features】 ○ Holds the stopping position of the rack bar. ○ Compact, lightweight, and economical. ○ Excellent strength and durability. ○ High efficiency, can be operated smoothly both manually and electrically. ○ The reduction gear unit is maintenance-free and does not require oil changes. 【Other Features】 ○ Input shaft that holds the stopping position without a stopper. ○ Low friction and excellent durability with a small number of teeth differential compound cycloidal mechanism. ○ Simple and robust machined case. ○ All-direction actuator capable of vertical, horizontal, and lateral movement. ○ Equipped with Shoji lock, achieving safety, labor-saving, and space-saving. ○ Rack-type lifting shaft that is strong against buckling and does not require a stop. ○ Reversible design that can be mounted on either side. ● For more details, please request documentation or 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.
Fixed thrust load of 200 kgf, advance per rotation of 3.0 mm, input torque at maximum load approximately 5.2 Nm, manual handle operation force approximately 4.4 kg (handle diameter 120 mm), applicable round rack rod φ20, body weight 3.3 kg (excluding rack). 【Features】 ○ Holds the stopping position of the rack rod. ○ Compact, lightweight, and economical. ○ Excellent strength and durability. ○ High efficiency, easy to operate both manually and electrically. ○ The reduction gear section is maintenance-free and does not require oil changes. 【Other Features】 ○ Input shaft that holds the stopping position without a stopper. ○ Low friction and excellent durability with a small number of teeth differential compound cycloidal mechanism. ○ Simple and robust machined case. ○ All-direction actuator capable of vertical lift, descent, and lateral movement. ○ Equipped with Shoji lock for safety, labor-saving, and space-saving. ○ Rack-type lifting shaft that is strong against buckling and does not require a stop. ○ Reversible design that can be mounted on either side. ● For details, please request materials or 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.
Fixed thrust load of 100 kgf, advancement per rotation of 0.56 mm, input torque of approximately 0.5 Nm at maximum load, allowable input rotation speed of 1750 rpm, applicable round rack rod φ15, body weight of 1.7 kg (excluding rack). 【Features】 ○ Holds the stopping position of the rack rod. ○ Compact, lightweight, and economical. ○ Excellent strength and durability. ○ High efficiency, easy to operate both manually and electrically. ○ The reduction gear unit is maintenance-free and does not require oil changes. 【Other Features】 ○ Input shaft that holds the stopping position without a stopper. ○ Low friction and excellent durability with a micro-tooth differential compound cycloidal mechanism. ○ Simple and robust machined case. ○ All-direction actuator capable of vertical lift, push, pull, and lateral movement. ○ Equipped with Shoji lock for safety, labor-saving, and space-saving. ○ Rack-type lifting shaft that is strong against buckling and does not require a stop. ○ Reversible design that can be mounted on either side. ● For more details, please request documentation or 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.
Rated thrust load of 200 kgf, advance per revolution of 1.1 mm, allowable input rotation speed of 1750 rpm, applicable round rack rod φ20, body weight of 3.3 kg (excluding rack) 【Features】 ○ Holds the stopping position of the rack rod ○ Compact, lightweight, and economical ○ Excellent strength and durability ○ High efficiency, can be operated smoothly both manually and electrically ○ The reduction gear unit is maintenance-free and does not require oil changes 【Other Features】 ○ Input shaft that holds the stopping position without a stopper ○ Low friction and excellent durability with a micro-tooth differential compound cycloidal mechanism ○ Simple and robust machined case ○ All-direction actuator capable of vertical lifting, lowering, and lateral movement ○ Equipped with Shoji lock for safety, labor-saving, and space-saving ○ Rack-type lifting shaft that is resistant to buckling and does not require a stop ○ Reversible design that allows installation on either side of the mounting surface ● For details, please request materials or contact us.