Office Chair Rotating Nut

The office chair rotating nut is a key component used for connection and adjustment in the structure of office chairs. Common types include 90° or 98° L-shaped adapter nuts, suitable for a variety of scenarios such as computer chairs, swivel chairs, lift chairs, and executive chairs.

Core Functions and Types

The primary role of the rotating nut is to achieve fixation and angle adjustment between components through threaded connections. For example, an L-shaped adapter nut can connect the chair back to the seat, allowing for adjustment of the chair back's tilt angle (such as 90° upright or 98° reclined) to meet different sitting posture needs. Its design must balance strength and flexibility to withstand the weight of the human body and the wear and tear from frequent adjustments.

Production Process Analysis

Taking the production process of the Wuhan XDK light-duty rotating nut combination as an example, its workflow demonstrates high precision and integration characteristics:

1. Blank Processing: A CNC sliding headstock lathe is used for 'one-time clamping, multi-process integration' processing, sequentially completing operations such as external turning and internal thread milling. The threads are milled using a helical interpolation method to ensure thread profile accuracy and surface finish, reducing subsequent assembly friction.
2. Heat Treatment: The metal substrate undergoes low-temperature stress-relief annealing in a mesh belt furnace to eliminate processing internal stresses, prevent deformation, and enhance material toughness, thereby extending the nut's service life.
3. Friction Plate Insertion: A hot-melt insertion method is used to secure the friction plate inside the nut, achieving a firm bond by melting the adhesive at high temperatures. The friction plate increases rotational resistance, preventing accidental sliding of the chair back while protecting the threads from direct wear.
4. Assembly and Inspection: After assembly, a rotational torque gradient inspection is required to ensure that the resistance at different angles meets design standards (such as gradually increasing torque when reclining). Inspection data is used to optimize the friction plate material or structure, balancing operational convenience and safety.

Surface Treatment and Lubrication

To reduce wear during long-term use, the nut's surface is treated with a dry film coating lubricant based on molybdenum disulfide. Molybdenum disulfide has a low friction coefficient and high-temperature resistance, forming a durable lubricating film that reduces direct metal-to-metal contact while preventing dust from entering the thread gaps, enhancing adjustment smoothness. A torque re-verification is performed before packaging to ensure consistent performance across each batch of products.

Expanded Application Scenarios

In addition to office chairs, rotating nuts are also widely used in automotive seat adjustment, medical equipment angle control, and other fields. Their design must adjust materials (such as stainless steel, high-strength plastics) and processes according to parameters like load and frequency to adapt to different usage environments.