Chairs For Sewing: Industrial Engineering
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CHAIRS FOR SEWING Industrial Engineering
Contents
Chair Basic terminology Importance Common Problems Salient features BIFMA standards Basic measurements Specifications
Chair
A chair is a kind of furniture for sitting, consisting of a back, and sometimes arm rests, commonly for use by one person. The back of the chair supports some of the weight of the occupant, reducing the weight on other parts of the body. In general, backrests come in three heights:
Lower back backrests support only the lumbar region. Shoulder height backrests support the entire back and shoulders. Headrests support the head
Basic Terminology .
Backrest Depth Seat Legs
Height
Basic Terminology
Backrest – It is the raised portion from the seat that gives support to the back
Seat – It is a flat surface raised from the ground level that gives support to the thighs and buttocks.
Legs – The legs give support to the seat of the chair and helps to raise the chair above the ground
Depth – The extent to which the chair gives support to the thighs.
Height – The distance of seat above the ground level at which the body can rest
Importance The chair is a critical piece of equipment for sewing machine operators who work in a seated position. It can have a very large impact on the comfort of the worker and can affect the risk of muscle pain and injury. It even adds to the fatigue of the operator if the selection of chair is wrong. A chair should be such that while working the operator should not require hands to work above shoulder height on a regular basis. Arms should be kept low and close to the body. Bending and twisting of wrists, back and neck should also be avoided.
Common Problems
Operators are provided with very poor chairs such as stacking chairs.
These chairs are not adjustable.
They provide no cushioning or back support and the edge of the seat constricts blood flow at the back of the legs because of a large rounded hump or square edge.
Often the seat pan is too large, resulting in the backrest not touching the back of the operator. The seat pan may have an uncomfortable hump at the front, causing the operator to sit on the front edge of the seat and not use the backrest
The sewing machine operator spends many hours seated in chair in front of sewing machine. So, the chair should fit the body perfectly and provide firm support.
Salient Features The good chairs have these features: 1.
2.
3.
4.
A chair with a center hydraulic lift system will allow the operator to adjust the chair height according to his body. It should be such that it allows the feet to rest flat on the floor with knees bent to form a 90 degree angle. This helps stabilize hips and lower back. The seat should have a forward-tilt adjustment which positions the body slightly forward to take pressure off the back of legs and keep the back straighter. The base of chair should be large enough to fit the body. A seat that is too small will cut into the thighs and make the operator uncomfortable after only a short time. The seat pan should be large enough to support the operator but small enough so that he or she can use the backrest
Salient Features 5. 6. 7. 8. 9.
A firm cushioning on the backrest and seat pan should be provided The seat should not have a hump on the front edge The base of the chair should be wide enough to avoid tipping. A base with five casters or "feet" will ensure good balance and stability. The backrest should not interfere with the movement of the shoulder blades or arms The chair can swivel when operators have to turn sideways frequently
BIFMA standards The Business and Institutional Furniture Manufacturer's Association (BIFMA) has given some standards for chair:
Chair back strength - 68 kg Seat strength dropped from six inches (150 mm) above the seat -102 kg Repeat cycle strength of 1,00,000 repetitions of 57 kg dropped from 2 inches (50 mm) above the seat
Basic Measurements
Back height 14 inches Seat height 21 – 19 inches
Seat depth 18 inches
Specifications Seat Specifications Height - 21 - 19 inches Width – 19 inches Depth – 18 inches Back Specifications Height – 14 inches Width – 16 inches Back Adjustment Seat – Rear 4-5 degree
- Front 5 – 6 degree
Back – Inward 8 – 10 degree
- Backward 16 – 17 degree
Specifications . 8-10 degree
4-5 degree 5-6 degree
16-17 degree
Ideal Position while sewing .
Rest Position .
THANK YOU
Contents
Chair Basic terminology Importance Common Problems Salient features BIFMA standards Basic measurements Specifications
Chair
A chair is a kind of furniture for sitting, consisting of a back, and sometimes arm rests, commonly for use by one person. The back of the chair supports some of the weight of the occupant, reducing the weight on other parts of the body. In general, backrests come in three heights:
Lower back backrests support only the lumbar region. Shoulder height backrests support the entire back and shoulders. Headrests support the head
Basic Terminology .
Backrest Depth Seat Legs
Height
Basic Terminology
Backrest – It is the raised portion from the seat that gives support to the back
Seat – It is a flat surface raised from the ground level that gives support to the thighs and buttocks.
Legs – The legs give support to the seat of the chair and helps to raise the chair above the ground
Depth – The extent to which the chair gives support to the thighs.
Height – The distance of seat above the ground level at which the body can rest
Importance The chair is a critical piece of equipment for sewing machine operators who work in a seated position. It can have a very large impact on the comfort of the worker and can affect the risk of muscle pain and injury. It even adds to the fatigue of the operator if the selection of chair is wrong. A chair should be such that while working the operator should not require hands to work above shoulder height on a regular basis. Arms should be kept low and close to the body. Bending and twisting of wrists, back and neck should also be avoided.
Common Problems
Operators are provided with very poor chairs such as stacking chairs.
These chairs are not adjustable.
They provide no cushioning or back support and the edge of the seat constricts blood flow at the back of the legs because of a large rounded hump or square edge.
Often the seat pan is too large, resulting in the backrest not touching the back of the operator. The seat pan may have an uncomfortable hump at the front, causing the operator to sit on the front edge of the seat and not use the backrest
The sewing machine operator spends many hours seated in chair in front of sewing machine. So, the chair should fit the body perfectly and provide firm support.
Salient Features The good chairs have these features: 1.
2.
3.
4.
A chair with a center hydraulic lift system will allow the operator to adjust the chair height according to his body. It should be such that it allows the feet to rest flat on the floor with knees bent to form a 90 degree angle. This helps stabilize hips and lower back. The seat should have a forward-tilt adjustment which positions the body slightly forward to take pressure off the back of legs and keep the back straighter. The base of chair should be large enough to fit the body. A seat that is too small will cut into the thighs and make the operator uncomfortable after only a short time. The seat pan should be large enough to support the operator but small enough so that he or she can use the backrest
Salient Features 5. 6. 7. 8. 9.
A firm cushioning on the backrest and seat pan should be provided The seat should not have a hump on the front edge The base of the chair should be wide enough to avoid tipping. A base with five casters or "feet" will ensure good balance and stability. The backrest should not interfere with the movement of the shoulder blades or arms The chair can swivel when operators have to turn sideways frequently
BIFMA standards The Business and Institutional Furniture Manufacturer's Association (BIFMA) has given some standards for chair:
Chair back strength - 68 kg Seat strength dropped from six inches (150 mm) above the seat -102 kg Repeat cycle strength of 1,00,000 repetitions of 57 kg dropped from 2 inches (50 mm) above the seat
Basic Measurements
Back height 14 inches Seat height 21 – 19 inches
Seat depth 18 inches
Specifications Seat Specifications Height - 21 - 19 inches Width – 19 inches Depth – 18 inches Back Specifications Height – 14 inches Width – 16 inches Back Adjustment Seat – Rear 4-5 degree
- Front 5 – 6 degree
Back – Inward 8 – 10 degree
- Backward 16 – 17 degree
Specifications . 8-10 degree
4-5 degree 5-6 degree
16-17 degree
Ideal Position while sewing .
Rest Position .
THANK YOU
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