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Patent Information & Production OptionsBaby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame · Patent CN213768690U

Patent CN213768690U: 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 numberCN213768690U (application CN202021870762)
TypeChina utility model (实用新型) - protects product shape and structure
Original titleBaby stroller with movably-mounted seat (可活动安装座椅的婴儿推车)
Patent ownerShaoxing Shangyu Rixing Hardware Products Co Ltd
InventorsZhao Guosong
Filing date2020-08-31
Grant date2021-07-23
Status (China)Active - In force in China until at most 2030-08-31 (if 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 CN213768690U)

What the claims cover, in plain language

Claim 1 defines a baby stroller with a frame and a seat. The frame has two symmetrical side frames. Each side frame is a four-bar linkage made of a handle rod, front foot bar, connecting rod, and rear foot bar. There is a first hinge between the handle and front bar, and a second hinge between the handle and rear bar. An adapter is provided for the seat; its rear side hinges to the rear foot bar, and its front side connects to the connecting rod via a support bar.

Claim 2 specifies that the adapter, link, support bar, and rear foot bar form a flexible four-bar linkage themselves. Claim 3 details the L-shaped connecting rod, with a transverse segment and an upturned segment, defining third and fourth hinge points. Claim 4 states the angle between the line connecting the first and second hinge points and the front foot bar is 0° to 15°. Claims 5-10 describe further hinge configurations, bends in the rear foot bar to aid folding, cross-bars connecting the two side adapters, and the collinearity of the handle and front bar with hidden extensions.

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 active. Making or selling this specific design in China requires the owner’s permission. However, since there are no corresponding patents in the US or Europe, the design itself is not restricted by this patent in those markets.

Two points to settle early:

  • Other patents may exist. The baby stroller industry is heavily patented globally, especially regarding folding mechanisms, brake systems, and material safety. Major competitors like Bugaboo, UppaBaby, and Graco hold extensive portfolios. A freedom-to-operate (FTO) review is essential before launching any similar four-bar linkage design in the US market.
  • Safety Standards Compliance. Regardless of patent status, all strollers sold in the US must meet strict federal safety regulations. The structural integrity described in the patent must be validated against these tests.

Customization and manufacturing

What can be customized

AreaOptions
MaterialsNot named in the patent; tube alloy and the resin for hinges and adapters are selected in design.
DimensionsTube diameter, length of handle, and wheelbase can be adjusted for target age groups.
FinishPowder coating, anodizing, or spray painting for frame colors.
Adapter DesignQuick-release button vs. twist-lock mechanisms for the seat mounting interface.
Linkage GeometryAdjusting the 0-15 degree angle mentioned in Claim 4 to optimize folding size vs. stability.

Things to plan for (US market)

  • ASTM F833 - Standard Consumer Safety Specification for Carriages and Strollers. This covers structural integrity, folding mechanisms, and entrapment hazards.
  • 16 CFR 1227 - Federal regulation mandating compliance with ASTM F833 for strollers sold in the US.
  • CPSC Reporting - Mandatory reporting of defects or injuries related to the folding mechanism.
  • Prop 65 - California requirements for labeling hazardous materials in plastics and finishes.

How a project runs

  1. Inquiry - Define target price, weight class, and folding dimensions.
  2. Design - CAD modeling of the four-bar linkage and adapter interface.
  3. Prototype - CNC machining or rapid prototyping of frame parts for fit and function testing.
  4. Testing - Drop tests, fatigue cycling, and ASTM F833 compliance checks.
  5. Production - Tube bending, injection molding for hinges/adapters, assembly, and QC.

Quantities & timeline

Tooling for injection molded plastic parts (adapters, hinges) takes 4-8 weeks. Metal frame bending fixtures take 2-4 weeks. Certification testing adds another 4-6 weeks. Send us your target weight, folding size, material preferences, quantity and target price and we will reply with options.

Patent drawings

Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 1
Fig. 1 - Schematic diagram of the stroller.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 2
Fig. 2 - Side view of the unfolded stroller.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 3
Fig. 3 - Structural schematic of the side frame.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 4
Fig. 4 - Detailed view of the hinge connections.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 5
Fig. 5 - Schematic of the folded stroller.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 6
Fig. 6 - Another view of the folded state.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 7
Fig. 7 - Exploded view of the frame components.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 8
Fig. 8 - Detail of the connecting rod.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 9
Fig. 9 - Detail of the rear foot bar bend.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 10
Fig. 10 - Adapter connection detail.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 11
Fig. 11 - Support bar linkage.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 12
Fig. 12 - Cross-bar connection between sides.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 13
Fig. 13 - Alternative embodiment view.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 14
Fig. 14 - Hinge point detail.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 15
Fig. 15 - Handle extension detail.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 16
Fig. 16 - Front foot bar detail.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 17
Fig. 17 - Rear foot bar detail.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 18
Fig. 18 - Connecting rod profile.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 19
Fig. 19 - Adapter profile.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 20
Fig. 20 - Support bar profile.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 21
Fig. 21 - Folded geometry analysis.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 22
Fig. 22 - Unfolded geometry analysis.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 23
Fig. 23 - Stress distribution diagram.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 24
Fig. 24 - Joint reinforcement detail.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 25
Fig. 25 - Wheel mount detail.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 26
Fig. 26 - Brake mechanism option.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 27
Fig. 27 - Canopy attachment point.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 28
Fig. 28 - Basket attachment point.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 29
Fig. 29 - Additional structural bracing.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 30
Fig. 30 - Overall assembly view.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 31
Fig. 31 - Component breakdown.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 32
Fig. 32 - Assembly sequence 1.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 33
Fig. 33 - Assembly sequence 2.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 34
Fig. 34 - Assembly sequence 3.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 35
Fig. 35 - Assembly sequence 4.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 36
Fig. 36 - Assembly sequence 5.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 37
Fig. 37 - Final assembly check.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 38
Fig. 38 - Packaging configuration.
Baby Stroller with a Movably-Mounted Seat and Four-Bar Linkage Frame - Patent Fig. 39
Fig. 39 - User manual illustration.

Drawings reproduced from the public patent document for reference.

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This page is based on the public patent document CN213768690U, assigned to Shaoxing Shangyu Rixing Hardware Products 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.