Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: 3rd Term
Week: 1
Age: 15 years
Duration: 45 minutes
Subject: Upholstery
Curriculum Theme: Trade
Previous Lesson: .
Topic: CONSTRUCTION OF A SIMPLE UPHOLSTERY ARTICLE
Subject Matter: Standard sizes of upholstery articles, Working drawing of upholstery article, Appropriate joints for upholstery articles, Using working drawings for construction

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Identify standard sizes for common upholstery articles.
Explain the purpose of a working drawing in upholstery construction.
List appropriate types of joints used in upholstery framing.

Affective Domain:

Appreciate the importance of accuracy and precision in upholstery design and construction.
Develop an interest in planning and designing upholstery articles before construction.

Psychomotor Domain:

Produce a simple working drawing for an upholstery article.
Select appropriate joints for a given upholstery frame design.

Collaborate with peers in discussing various upholstery designs and construction methods.
Share tools and materials responsibly during practical drawing activities.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Senior Secondary Schools.
State Unified Scheme of Work for Upholstery, SSS 1.
Basic Technology for Senior Secondary Schools 1 by F.O. Olaitan et al.
Federal Ministry of Education Curriculum Portal
Nigerian Educational Research and Development Council (NERDC)

Instructional Materials

The teacher will teach this lesson with the aid of:

Graph paper, ruler, and set square.
Measuring tape.
Photos or diagrams of various wood joints.
A simple, unfinished upholstery frame or a model.
Drawing boards, pencils, and erasers.

Rationale for the Lesson

This lesson helps pupils understand the foundational steps involved in creating upholstery articles. It enables them to apply design principles and construction techniques, which are essential skills for anyone interested in furniture making or vocational trades.

Prerequisite/Previous Knowledge

Pupils are expected to have basic knowledge of technical drawing, measurement, and simple woodworking tools from their Basic Technology classes.

Lesson Content/Board Summary

CONSTRUCTION OF A SIMPLE UPHOLSTERY ARTICLE

Standard Sizes of Upholstery Articles

Standard sizes refer to the common and generally accepted dimensions for various upholstery furniture pieces. These sizes ensure comfort, functionality, and efficient use of materials.

Common upholstery articles and their approximate standard dimensions (length x width x height) include:

Single Chair/Armchair: 75cm x 80cm x 85cm
Two-Seater Sofa: 150cm x 80cm x 85cm
Three-Seater Sofa: 200cm x 80cm x 85cm
Ottoman/Footstool: 60cm x 60cm x 40cm
Dining Chair: 45cm x 50cm x 90cm

Working Drawing of Upholstery Article

A working drawing is a detailed technical drawing that provides all the necessary information, dimensions, and specifications required to construct an upholstery article.

The importance of a working drawing in upholstery construction includes:

It serves as a visual guide for construction.
It helps in accurately estimating material quantities.
It ensures precision and consistency in production.
It allows for modifications and corrections before actual construction begins.
It helps in communicating design ideas clearly to others.

Appropriate Joints for Upholstery Articles

Wood joints are connections between two or more pieces of wood used to form the frame of an upholstery article. The choice of joint depends on the strength required and the type of stress the joint will withstand.

Appropriate joints commonly used in upholstery framing are:

Mortise and Tenon Joint: A strong joint where a projecting tenon fits into a mortise (hole). Used for connecting rails to legs.
Dowel Joint: Uses cylindrical wooden pins (dowels) inserted into corresponding holes in two pieces of wood. Suitable for butt joints.
Lap Joint: Two pieces of wood are cut to half their thickness and overlapped. Provides good surface area for glue.
Dovetail Joint: A very strong, interlocking joint often used for drawers, but can be adapted for frame sections requiring high strength.
Corner Block Joint: Often used with other joints for added reinforcement at corners of frames.

Using Working Drawings for Construction

Working drawings guide the entire construction process, from cutting materials to assembly.

Steps involved in using working drawings for construction are:

Interpretation: Understanding all dimensions, views (front, side, top), and notes on the drawing.
Material Selection: Choosing appropriate wood based on the drawing’s specifications.
Marking Out: Transferring dimensions from the drawing onto the wood pieces.
Cutting: Precisely cutting wood pieces according to the marked lines.
Joint Preparation: Creating the specified joints (e.g., mortise and tenon) as indicated in the drawing.
Assembly: Joining the cut and prepared pieces using the specified joints and fasteners (e.g., glue, screws).
Quality Control: Regularly checking dimensions against the drawing during assembly to ensure accuracy.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids, Practical Activity

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils, reviews the previous lesson briefly, and then introduces the new topic by asking pupils about different types of furniture they have at home and how they think they are made. The teacher then states the topic: “Construction of a Simple Upholstery Article.”
Pupils’ Activity: Pupils respond to questions and listen attentively to the introduction of the new topic.
Learning Point: Pupils are prepared for the day’s lesson and connect it to their prior knowledge.

Step 2: Explanation of Standard Sizes

Time: 7 minutes
Teaching Skill: Explanation/Lecture
Teacher’s Activity: The teacher explains the concept of standard sizes in upholstery articles, giving examples of common furniture pieces and their typical dimensions. The teacher uses charts or diagrams to illustrate these sizes.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification regarding standard dimensions.
Learning Point: Pupils understand what standard sizes are and why they are important for upholstery articles.

Step 3: Introduction to Working Drawings

Time: 8 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher defines a working drawing and explains its importance in upholstery construction. The teacher shows examples of simple working drawings for furniture frames, pointing out key features like dimensions, different views (front, side, top), and material specifications.
Pupils’ Activity: Pupils observe the examples, ask questions, and contribute to the discussion on the importance of accurate drawings.
Learning Point: Pupils grasp the definition and significance of working drawings in the construction process.

Step 4: Appropriate Joints for Upholstery Articles

Time: 7 minutes
Teaching Skill: Demonstration/Visual Aids
Teacher’s Activity: The teacher explains various types of wood joints suitable for upholstery frames, such as mortise and tenon, dowel, and lap joints. The teacher uses actual samples, diagrams, or photos to demonstrate how these joints are made and their applications.
Pupils’ Activity: Pupils examine the samples or diagrams, listen to explanations, and identify the different types of joints.
Learning Point: Pupils identify and understand the function of various joints used in upholstery framing.

Step 5: Practical Application – Drawing

Time: 10 minutes
Teaching Skill: Guided Practice/Demonstration
Teacher’s Activity: The teacher guides pupils through a simple exercise of producing a basic working drawing for a small upholstery article (e.g., a footstool frame) on graph paper. The teacher emphasizes correct scaling and labeling of dimensions.
Pupils’ Activity: Pupils attempt to draw a simple working drawing, applying the principles discussed, with the teacher’s guidance.
Learning Point: Pupils develop practical skills in creating simple working drawings.

Step 6: Discussion on Construction using Drawings

Time: 5 minutes
Teaching Skill: Discussion/Questioning
Teacher’s Activity: The teacher leads a discussion on how the working drawing created in Step 5 would be used to guide the actual construction of the upholstery article. The teacher asks pupils to explain the sequence of steps from drawing to final assembly.
Pupils’ Activity: Pupils actively participate, suggesting steps and discussing the practical application of working drawings.
Learning Point: Pupils understand the practical link between a working drawing and the construction process.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Mention two standard sizes for a three-seater sofa.
Define a working drawing and state two of its importance.
List three appropriate joints used in upholstery articles.
Explain how a working drawing guides the construction of an upholstery article.

Pupils’ Activity: Pupils answer orally and in writing.
Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 3 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key learning points of the lesson, reiterating the importance of standard sizes, working drawings, and appropriate joints in upholstery construction. The teacher assigns homework: “Draw a working drawing for a simple single armchair frame, showing its front and side views with dimensions.”
Pupils’ Activity: Pupils listen to the summary and copy the homework assignment.
Learning Point: Pupils reinforce their understanding of the lesson and have an activity to practice their new skills.

Lesson Keywords

Upholstery – The art or business of stuffing and covering furniture, especially seats, with material.
Standard Sizes – Generally accepted or common dimensions for furniture pieces to ensure comfort and functionality.
Working Drawing – A detailed technical drawing providing all necessary information for construction.
Joints – Connections between two or more pieces of wood in a frame.
Mortise and Tenon Joint – A strong wood joint consisting of a projecting piece (tenon) fitting into a hole (mortise).

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to sketch different views of a more complex upholstery article or research additional types of joints. For pupils needing more support, the teacher will provide pre-drawn templates for the working drawing activity and offer one-on-one guidance during the practical session.

Note for teachers using this lesson plan

Ensure that actual samples or clear visual aids of upholstery articles, working drawings, and various wood joints are available for demonstration. Encourage active participation and allow enough time for the practical drawing activity. Emphasize safety if any tools are used for demonstration of joints.