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Patent Information & Production OptionsSelf-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub · Patent CN211483640U

Patent CN211483640U: 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 numberCN211483640U (application CN202020032960)
TypeChina utility model (实用新型) - protects product shape and structure
Original titleStackable automatic leveling supporting leg structure (一种可叠放式自动找平支撑脚结构)
Patent ownerAlma Manufacturing Co., Ltd. (广州南沙澳美发金属塑料制品有限公司)
InventorsGuan Xiaohui
Filing date2020-01-08
Grant date2020-09-15
Status (China)Lapsed - terminated for non-payment of annual fees (recorded 2025-01-03)
Patent familyChinese filings only - no US, European, Japanese, PCT or other filings listed
Cited by4 later documents
SourceGoogle Patents (search for CN211483640U)

What the claims cover, in plain language

Claim 1 - a support-leg structure with a fixed seat mounted under an object and several inclined legs around it, some mounted at different heights. A rotatable torsion ring with a vertical axis sits in the seat and has a torsion groove facing each leg. Each leg has a connecting post reaching into its groove, with a dial tooth between them, and limiting structures between post and tooth and between tooth and groove.

Claim 2 - a vertical column on top of the seat, with the supported object hinged to the column top. Claim 3 - four legs evenly around the seat, two adjacent legs mounted higher than the other two. Claims 4-5 - two layouts of the limit slots on the four torsion grooves (same direction on opposite grooves, or opposite directions on adjacent grooves). Claims 6-9 - further features described in the patent for the leg ends, the posts and the teeth.

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 has lapsed, so it no longer restricts anyone in China either. It has no US or other foreign counterpart.

Two points to settle early:

  • Other patents may exist. Self-stabilizing table bases are an active US patent area - companies selling wobble-free café and flip-top table bases hold patents on their leveling mechanisms. A freedom-to-operate (FTO) review of the final hub design by a US patent attorney should come before tooling.
  • Leveling range and stiffness. How far the base can compensate, and how firm it feels when someone leans on the table, depend on tooth and slot geometry; both must be proven on prototypes.

Customization and manufacturing

What can be customized

AreaOptions
LegsSteel tube, cast aluminum or flat bar; leg spread for round or square tops
HubCast aluminum or welded steel seat; nylon or steel torsion ring and teeth
HeightDining, bar or coffee-table height columns
Top mountingFlip-top hinge with lock, or fixed top plate
FeetNylon, rubber or felt glides; outdoor-grade caps
FinishPowder coat colors, outdoor corrosion protection, branding on the hub cap

Things to plan for (US market)

  • ANSI/BIFMA X5.5 (desk/table products) - contract buyers expect stability and strength testing for tables, including load and tip tests with the hinged top locked.
  • Flip-top lock and pinch points - the hinge needs a positive lock and finger clearance; test the lock under a leaning load.
  • Outdoor versions - salt-spray resistance of the coating and UV stability of plastic parts for patio use.
  • California Prop 65 - check coatings and plastic or rubber glides.
  • ADA knee clearance - for restaurant and public tables, the base and column must leave the clear knee space buyers specify.

How a project runs

  1. Inquiry - table size, height, top type and quantity.
  2. Design - hub, ring and tooth geometry set for the load and leveling range.
  3. Prototype - working bases tested on stepped and sloped surfaces and for nesting.
  4. Pilot run - small batch for BIFMA-type tests, finishing and packaging.
  5. Production - volume production, packaging and shipping.

Quantities & timeline

The hub needs a casting or welding fixture and machining for the ring bore, the ring and teeth need injection or die-casting molds, and the legs need tube bending and welding jigs plus a powder-coat line. Most development time goes into the ring and tooth fit. Send us your table size, height, top type, quantity and target price and we will reply with options.

Patent drawings

Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 1
Fig. 1 - The self-leveling support base.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 2
Fig. 2 - Internal structure of the base.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 3
Fig. 3 - Several bases in the stacked (nested) state.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 4
Fig. 4 - Nested bases, another view.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 5
Fig. 5 - Exploded view of the base.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 6
Fig. 6 - Exploded view of the leg connections.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 7
Fig. 7 - Part of a leg with its connecting post.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 8
Fig. 8 - The torsion ring.
Self-Leveling, Nesting Table Base with a Torsion-Ring Leg Hub - Patent Fig. 9
Fig. 9 - The dial tooth.

Drawings reproduced from the public patent document for reference.

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Bring this product to market

  1. ✓ Patent vetted China-only family and legal status checked
  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 CN211483640U, assigned to Alma Manufacturing Co., Ltd. (广州南沙澳美发金属塑料制品有限公司). 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.