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Four Bar Chain Apparatus
Four Bar Chain Apparatus (Product Code: SLE/MCE/25) is a kinematics teaching unit used to show how a four-bar linkage converts uniform continuous rotation into non-uniform rotation or oscillation, in theory of machines laboratories. Students reposition its pivot joints to change crank radius, oscillation radius and coupling length, then read input and output angles on built-in scales to compare crank-rocker, double rocker and double crank mechanisms. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Key Details
| Parameter | Detail |
|---|---|
| Mechanism | Four-bar linkage (four-joint link) with elements connected by pivot joints |
| Motion conversion | Uniform rotation into non-uniform rotation or oscillation; rotary into oscillating motion |
| Input side | Drive disk with crank and coupling; disc with angular scale for the exact input angle |
| Output side | Output disk with rocker; output angle read on its angle scale |
| Adjustments | Pivot positions vary crank radius, oscillation radius and coupling length; crank pin locates at different radii |
| Mechanisms studied | Crank-rocker, double rocker and double crank |
| Mounting | Elements on a base plate with an integrated angle scale |
| Handling | Two handles for easy carrying and stacking |
| Product code | SLE/MCE/25 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Four Bar Chain Apparatus Used For?
Four-bar linkages sit inside windscreen wipers, rocking conveyors, pump jacks and countless machine mechanisms, and this unit lets students see exactly how one works. The class turns the drive disk in equal steps, notes the input angle on its scale and reads the matching output angle on the output disk. Plotting output against input reveals the non-uniform motion, the limits of oscillation and the dead-centre positions of the linkage.
Changing the pivot positions then shows how link proportions decide whether the linkage behaves as a crank-rocker, double rocker or double crank — the Grashof condition taught in lectures. Work gently near the extreme positions, tighten the pivots after each change and keep a sketch of every configuration with its readings. For departments sourcing mechanics lab equipment in India, it is a stackable, portable unit that serves several groups in turn.
OEM Manufacturer
Jain Scientific Equipments Private Limited, trading as ScienceLab, is the OEM (original equipment manufacturer) of the Four Bar Chain Apparatus. It is produced and assembled at the company's own licensed factory at Saha, Ambala, Haryana, India, and supplied factory-direct to engineering colleges, polytechnics, technical training institutes, dealers and importers.
Because you deal with the maker, questions about link parts, pivots or matching units for additional benches get answered at source — just ask us. See the ScienceLab profile for company details.
Related Theory of Machines Equipment
These units continue the kinematics topics that start with the four-bar chain:
- Cam Mechanism — another way to turn rotation into follower motion.
- Cam Analysis Machine — deeper study of cam and follower behaviour.
- Corollis Component of Acceleration Apparatus — takes link kinematics on to acceleration analysis.
- Gear Trainer Demonstrator — compares linkage motion with transmission through gears.
Browse the full Theory of Machines category.
Frequently Asked Questions
What does the Four Bar Chain Apparatus demonstrate?
The Four Bar Chain Apparatus demonstrates how a four-bar linkage converts uniform continuous rotation into non-uniform rotation or oscillation. Students measure input and output angles to see the motion relationship for different link arrangements.
Which mechanisms can be set up on the Four Bar Chain Apparatus?
The Four Bar Chain Apparatus can be arranged as a crank-rocker mechanism, a double rocker mechanism or a double crank. Moving the pivot joints changes crank radius, oscillation radius and coupling length to switch between them.
How are angles measured on the Four Bar Chain Apparatus?
On the Four Bar Chain Apparatus, the input angle is set with the drive disk and read on an angular scale, while the output angle is read on the scale of the output disk. Both scales are built into the unit.
Is the Four Bar Chain Apparatus easy to store and move?
Yes. The Four Bar Chain Apparatus has all elements mounted on a base plate with two handles, which make the unit easy to carry between benches and to stack when the practical is finished.
Who manufactures the Four Bar Chain Apparatus?
The Four Bar Chain Apparatus is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory in Saha, Ambala, Haryana, India. Quotations and follow-up support come directly from the manufacturer.
What should a quotation request for the Four Bar Chain Apparatus include?
A quotation request for the Four Bar Chain Apparatus should state how many units you need, any other theory of machines items you are equipping at the same time, and the delivery location. Send it via the contact page.
Request a Quote
Quotations for the Four Bar Chain Apparatus come direct from the manufacturer. Use the ScienceLab contact page or the enquiry cart, and include quantity and delivery details.
Last updated: 24 September 2026
