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Patent Information & Production OptionsAutomobile Safety Belt Lock Tongue with Self-Locking Slider · Patent CN114869025B

Patent CN114869025B: bibliographic data, legal status, family, a plain-language reading of the claims, plus customization, US compliance points and how a manufacturing project runs.

At a glance

Patent numberCN114869025B (application CN202210452717)
TypeChina invention patent (发明专利) - protects method and structure
Original titleAutomobile safety belt lock tongue (一种汽车安全带锁舌)
Patent ownerZhejiang Songyuan Automotive Safety Systems Co ltd
InventorsShi Bingjun, Wu Jianan, Du Jicheng, Sun Bo, Zhao Hong
Filing date2022-04-27
Grant date2023-05-05
Status (China)In force - valid until at most 2042-04-27, provided annual fees are paid
Patent familyChinese filings only - no US, European, Japanese, PCT or other filings listed
Cited by0 later documents
SourceGoogle Patents (search for CN114869025B)

What the claims cover, in plain language

Claim 1 defines an automobile safety belt lock tongue with a self-locking slide block slidably arranged on the lock tongue body. The block approaches the holding part of the tongue. An engagement part is on the end surface of the block opposite the holding part, forming a first gap. The block has a stop block; the webbing penetrates the gap, bypasses the stop block, and turns back. The block consists of first and second side plates buckled together. The upper end of the first plate has the engagement part; the second plate has the stop block. Structures on the upper surface of the engagement part and lower surface of the holding part are mutually meshable. When the webbing is drawn, it drives the block toward the holding part via the stop block, reducing the gap until the engagement part meshes with the webbing against the holding part.

Claim 2 specifies that one of the mating surfaces (upper engagement or lower holding) has a tooth-like configuration, while the other has a honeycomb-like configuration.

Claim 3 adds a limit rib on the inner surface of the slide block fitting the body, and an inclined boss on the bolt body side. These interact to limit the travel of the self-locking sliding block.

Claim 4 places a first boss and second boss on the left and right edges of the grip portion to define the angle at which the webbing contacts the holding part.

Claim 5 includes gripping ribs on the outer surfaces of the left and right side end surfaces of the self-locking slider for manual handling.

This is a simplified reading for orientation only. The legal scope is defined by the exact claim wording in the official Chinese document.

What this means for US production

This patent was filed only in China and is currently in force. Making or selling this specific design in China requires the owner’s permission. It has no US or other foreign counterpart.

Two points to settle early:

  • Other patents may exist. Automotive restraint systems are a heavily patented field led by major global suppliers (e.g., Autoliv, ZF, Joyson). While this specific self-locking slider mechanism appears unique to this filing, broader concepts of “active locking tongues” or similar webbing management devices may be covered by existing US patents. A freedom-to-operate (FTO) review is strongly recommended before tooling for the US market.
  • Regulatory compliance. Seat belt components must meet strict federal motor vehicle safety standards (FMVSS). Any modification to the tongue geometry affects crash test results and certification requirements.

Customization and manufacturing

What can be customized

AreaOptions
MaterialHigh-strength steel, aluminum alloy, or engineering plastics for the body and slide block.
Surface TreatmentZinc plating, nickel plating, or powder coating for corrosion resistance.
Webbing WidthStandard 48mm or custom widths depending on vehicle application.
Engagement GeometryTooth pitch and honeycomb depth can be adjusted to match specific webbing materials.
ColorBlack, grey, or custom colors to match interior aesthetics.

Things to plan for (US market)

  • FMVSS 209 - Seat belt assemblies: covers performance requirements for strength, durability, and labeling.
  • FMVSS 210 - Seat belt assembly anchorages: specifies strength tests for anchorage points.
  • SAE J2249 - Recommended practice for seat belt webbing and hardware.
  • Crash Test Validation - Full vehicle or sled testing is required to certify the component’s performance in real-world impact scenarios.

How a project runs

  1. Inquiry - Define vehicle platform, webbing specs, and target weight/load class.
  2. Design - CAD modeling of the tongue body and slide block, FEA analysis for stress distribution.
  3. Prototype - CNC machining or rapid prototyping of samples for dimensional check.
  4. Testing - Static pull tests, fatigue cycling, and environmental exposure (salt spray, temp).
  5. Production - Precision stamping/molding, assembly of side plates, quality inspection.

Quantities & timeline

Tooling for the lock tongue body typically involves progressive dies for steel or injection molds for plastic components. The self-locking slider requires precise alignment of side plates and engagement structures. Certification testing for automotive safety components is time-intensive, often taking several months. Send us your material preference, webbing width, quantity, and target price and we will reply with options.

Patent drawings

Automobile Safety Belt Lock Tongue with Self-Locking Slider - Patent Fig. 1
Fig. 1 - Perspective view of the assembled lock tongue.
Automobile Safety Belt Lock Tongue with Self-Locking Slider - Patent Fig. 2
Fig. 2 - Exploded view of the lock tongue components.
Automobile Safety Belt Lock Tongue with Self-Locking Slider - Patent Fig. 3
Fig. 3 - Cross-section showing the webbing path and engagement gap.
Automobile Safety Belt Lock Tongue with Self-Locking Slider - Patent Fig. 4
Fig. 4 - Detail of the limit rib and inclined boss interaction.
Automobile Safety Belt Lock Tongue with Self-Locking Slider - Patent Fig. 5
Fig. 5 - Top view showing the gripping ribs on the side plates.

Drawings reproduced from the public patent document for reference.

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  2. 2 Product brief · now How it works, uses and options written up
  3. 3 Prototype First samples for buyers to review
  4. 4 Pilot run Small first batch for launch customers
  5. 5 Volume production Repeat orders at scale

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This page is based on the public patent document CN114869025B, assigned to Zhejiang Songyuan Automotive Safety Systems Co ltd. IP2M is an independent manufacturing service and is not affiliated with, endorsed by or licensed by the patent owner. Images marked as concept renderings are illustrations, not photos of an existing product. Patent status information is provided for reference only and is not legal advice; confirm freedom to operate for your market before production. Full disclaimer.