steel folding cots

IS 8761: Scope and Key Specifications for Steel Folding Cots

• Scope: Covers materials, dimensions, fabrication, and testing of steel folding cots.

Key Specifications:

Additional Notes:

• Welding and materials comply with relevant IS standards for steel, electrodes, and coatings.
• All dimensions in millimeters.

flowchart LR
    A[Steel Tubular Frame] --> B[Max 2 Joints]
    B --> C[Pipe Insert in Joint]
    C --> D[Welding]
    A --> E[Bends Radius ≤ 150 mm]
    E --> F[10 mm Hole for Mosquito Net]
    G[Surface Prep] --> H[Pickling, Scrubbing, Rinsing]
    I[Paint Test] --> J[Flexibility & Adhesion per IS 101]

This summary ensures compliance with IS 8761 scope and key fabrication/testing requirements for steel folding cots.

IS 8761: Key Specifications & Materials Data

Materials Specifications

• Mild Steel Rounds & Flats: As per IS:1977-1969.
• Steel Tubular Pipes for Frame:
  • Wall thickness ≥ 2 mm
  • Outside diameter = 25 mm
• Mild Steel Angles: Minimum section 40 x 40 x 3 mm
• Unequal Channel Section: Refer to Fig. 2 in IS 8761 for dimensions.

Frame Fabrication

• Max 2 joints per frame.
• For tubular frames, insert a pipe piece inside the joint with OD = ID of frame pipe; secure by welding.
• Bend radius ≤ 150 mm without cracks or defects.
• Provide 10 mm diameter hole at bends for mosquito curtain fixing.

Tests on Material

• Flexibility & Adhesion Test:
  • Sample size: 150 x 50 mm, thickness 0.315 mm
  • Paint film must show no damage or cracking under 10x magnification (IS:101-1964).

Rounding Off Values

• Follow IS:2-1960 for rounding test results to the same significant digits as specified values.

Summary Table: Frame Material Dimensions

flowchart TD
    A[Material Selection] --> B{Type}
    B -->|Tubular Pipe| C[Wall ≥ 2mm, OD=25mm]
    B -->|Mild Steel Angle| D[40x40x3 mm]
    B -->|Unequal Channel| E[Refer Fig.2]
    C --> F[Max 2 joints, welded]
    F --> G[Bend radius ≤ 150mm]
    G --> H[10 mm hole at bends]

This concise summary covers IS 8761 material specs, fabrication, and testing requirements. For detailed dimensions, refer to figures and referenced

IS 8761: Dimensions and Tolerances for Steel Folding Cots

Key Dimensions (Clause 3.1 & Fig. 1)

Tolerances (Clause 3.2)

• ± 5 mm permissible variation on the specified dimensions.

Frame Specifications (Clause 4.1 & Fig. 2)

• Frame material:
  • Steel tubular pipes, OD ≥ 25 mm, wall thickness ≥ 2 mm
  • Mild steel angles: 40 x 40 x 3 mm
  • Mild steel unequal channel sections (refer IS: 808-1964)
• Joints: Max two; tubular pipe joints must have internal pipe inserts and be welded.
• Bends: Inside radius ≤ 150 mm, no cracks or defects.
• Holes: 10 mm diameter at bend centers for mosquito curtain frame fixing.

Summary Diagram of Dimensions

graph LR
A[Length: 1830 or 1890 mm] --> B[Width: 760 mm]
B --> C[Height: 400 mm]
C --> D[Frame: Tubular pipe or angle/channel]
D --> E[Wall thickness ≥ 2 mm, OD ≥ 25 mm]

References:

• IS 808-1964 for angles and channels.
• IS 1977-1969T for mild steel.
• Welding specifications as per related IS codes.

IS 8761 - Key Construction Specifications for Steel Folding Cots

Frame Material & Dimensions (Clause 4.1)

• Frame Material:
  • Steel tubular pipes:
    • Wall thickness ≥ 2 mm
    • Outside diameter = 25 mm
  • Mild steel angles: 40 x 40 x 3 mm
  • Mild steel unequal channel section (see Fig. 2)
• Joints: Maximum 2 joints per frame
  • Tubular pipe joints: insert pipe piece with outer diameter = inside diameter of frame pipe, weld securely
• Bends:
  • Inside radius ≤ 150 mm
  • No cracks, unevenness, or defects allowed
  • Provide 10 mm diameter hole at bend center for mosquito curtain fixing

Surface Preparation (Clause 6.1)

• Remove all sharp edges
• Pickle, scrub, and rinse components to remove grease, rust, scale, or foreign matter

Relevant IS Specifications

• IS 1977-1969T: Mild steel angles and channels
• IS 808-1964: Mild steel angles
• Specifications for welding consumables and steel sheets as per relevant revisions

Summary Table: Frame Material Dimensions

Welding Joint Detail (Tubular Frame)

flowchart LR
    A[Tubular Frame Pipe] --> B[Insert Pipe Piece (OD = ID of frame pipe)]
    B --> C[Weld Joint Securely]

Note: Refer to IS 8761 figures for detailed sketches of frame sections and joints.

IS 8761 Welding and Assembly Key Points:

• Surface Preparation (Clause 6.1):

  • Remove all sharp edges.
  • Components must be pickled, scrubbed, and rinsed to eliminate grease, rust, scale, and foreign matter.

• Welding Methods (Clause 5.2):

  • Gas welding per IS 1323-1966 (Oxy-acetylene welding).
  • Arc welding per IS 816-1969 (Metal arc welding for structural steel).

• Electrodes and Filler Rods (Clause 2.4):

  • Must conform to:
    • IS 1278-1972 (Electrodes for gas welding).
    • IS 814 (Part I & II)-1974 (Covered electrodes for metal arc welding).

• Frame Assembly (Clause 4.1):

  • Tubular steel pipes: min. 2 mm wall thickness, 25 mm outer diameter.
  • Mild steel angles: 40 x 40 x 3 mm or unequal channel sections (see Fig. 2).
  • Max 2 joints; joints reinforced by inserting pipe piece matching inside diameter before welding.
  • Bend radius ≤ 150 mm without defects.
  • Provide 10 mm diameter hole at bend centers for mosquito curtain frame.

Summary Table: Welding Specs

flowchart TD
    A[Component Preparation] --> B[Remove sharp edges]
    B --> C[Pickle, scrub, rinse]
    C --> D[Welding Method Selection]
    D --> E[Gas Welding (IS 1323)]
    D --> F[Arc Welding (

IS 8761: Surface Treatment and Finishing - Key Points

1. Surface Preparation (Clauses 6.1 & 6.2)

• Remove sharp edges and clean components by pickling, scrubbing, and rinsing to eliminate grease, rust, and scale.
• Phosphating Treatment: Immediately after pickling, apply phosphate coating per Class C of IS 3618-1966.
• Application process follows IS 6005-1970 for phosphate coating.
• Use putty (IS 426-1961) for filling surfaces.
• Apply aluminium primer conforming to IS 2931-1964.

2. Paint Application (Clause 6.3)

• Apply enamel paint coats with enamels per IS 151-1950, IS 2932-1975, or IS 2933-1975.
• Finish coat should be smooth, uniform, and free from defects.

3. Flexibility and Adhesion Test (Clause 7.3)

• Test sample size: 150 mm x 50 mm, thickness up to 0.315 mm.
• Test per IS 101-1964 (Clause 16) for flexibility and adhesion.
• Under 10x magnification, paint film should show no damage, detachment, or cracking.

Summary Table for Surface Treatment Steps

flowchart TD
    A[Steel Component]

IS 8761: Performance Requirements Summary

IS 8761 outlines performance requirements mainly related to the paint/coating system on steel folding cots, focusing on durability and adhesion.

Key Points:

• Technical Information (Clause 9.1): Purchaser must provide specific technical details when placing orders.
• Rounding Off (Clause 0.4): Test results must be rounded per IS 2-1960, keeping significant figures consistent with standard values.
• Flexibility & Adhesion Test (Clause 7.3):
  • Sample size: 150 x 50 mm, thickness 0.315 mm
  • Test per IS 101-1964, Section 16
  • Paint film must show no damage, detachment, or cracking under 10x magnification.
• Paint Coats (Clause 6.3):
  • Finish coat with enamels conforming to IS 151-1950, IS 2932-1975, or IS 2933-1975.

Typical Test Procedure Summary:

Notes on Paint Standards:

• IS 151-1950: Enamel paint specifications
• IS 2932 & IS 2933-1975: Specifications for enamel finishes

flowchart LR
    A[Order Placement] --> B[Technical Info Supplied (Clause 9.1)]
    B --> C[Sample Preparation (150x50 mm, 0.315 mm)]
    C --> D[Flexibility & Adhesion Test (IS 101-1964)]
    D --> E{Paint Film Condition}
    E -->|No Damage| F[Pass]
    E -->|Damage/Cracking| G[Fail]
    F --> H[Apply Finish Coat per IS 151/2932/2933]

For detailed paint and test methods, refer to the respective IS codes cited.

IS 8761: Packaging - Key Points & Specifications

Clause 8.1: Packaging Requirements

• All component parts must be packed to prevent damage during transit.
• Packaging should ensure protection against mechanical shocks, corrosion, and environmental effects.

Clause 9.1: Information to be Supplied

• Purchaser must provide technical details at order placement.
• Final test values must be rounded off as per IS 2-1960 to maintain consistency.

Clause 10.2: Marking

• Steel folding cots may carry the ISI Certification Mark indicating compliance with IS standards.
• ISI mark assures quality control, inspection, and conformity.

Additional Notes:

• Packaging materials should be compatible with the product (e.g., corrosion-resistant for steel parts).
• Use cushioning, sealing, and protective coatings if necessary.
• Markings should be clear, durable, and include product details and certification.

Summary Table: Packaging & Marking

flowchart TD
    A[Order Placement] --> B[Technical Info Supplied]
    B --> C[Manufacturing]
    C --> D[Packaging]
    D --> E[Damage Prevention]
    E --> F[Marking with ISI Mark]
    F --> G[Dispatch]

For detailed packaging methods or materials, refer to relevant IS codes on packaging and transport of steel products.

IS 8761 - Clause 9.1: Information to be Supplied by Purchaser

When placing an order, the purchaser must provide the following key information to ensure compliance and correct fabrication:

• Spring Clamps: Specify if spring clamps are required.
• NEWAR Requirement: Indicate whether NEWAR (a specific treatment or finish) is needed.
• Alternative Construction & Finish: Clearly state any alternative methods or finishes different from the standard.
• Frame & Legs Section Type: Specify if frame and legs should be made from tubes, angle sections, channel sections, or a combination.

Additional Notes:

• Rounding Off Values: Final test or analysis results should be rounded per IS 2-1960, maintaining the same significant figures as specified.
• Packing: Components must be packed to avoid damage during transit (Clause 8.1).
• Testing: Paint and finish tests (flexibility and adhesion) must comply with IS 101-1964 standards.

Summary Table for Purchaser Information

flowchart TD
    A[Purchaser places order] --> B[Specify spring clamps]
    A --> C[Specify NEWAR requirement]
    A --> D[Specify alternative construction/finish]
    A --> E[Specify frame & legs section type]
    B & C & D & E --> F[Supplier fabricates as per specs]

This ensures clarity and conformity to IS 8761 requirements.

IS 8761 - Marking of Steel Folding Cots (Clause 10)

Key Points:

• Clause 10.1:
  All steel folding cots must be marked with a suitable manufacturer's identification mark.

• Clause 10.2:
  The cots may also carry the ISI Certification Mark indicating compliance with the standard and quality assurance.

ISI Certification Mark Details:

• Governed by the Indian Standards Institution (Certification Marks) Act.
• Indicates production under strict inspection, testing, and quality control.
• ISI marked products are continuously monitored for conformity.
• License for ISI mark use is issued by ISI under defined conditions.

Summary Table for Marking Requirements

Additional Notes:

• Marking ensures traceability and compliance.
• Purchasers should specify technical details at order placement (Clause 9.1).
• Marking supports quality control and consumer confidence.

flowchart TD
    A[Steel Folding Cot] --> B[Manufacturer's Mark (Mandatory)]
    A --> C[ISI Certification Mark (Optional)]
    C --> D[Indicates compliance & quality assurance]
    B --> E[Identifies Manufacturer]

For licensing and further details, contact BIS regional offices listed in the standard.