Content
Introduction
Existed
Product Design Problem Analysis
Expectation
of New Hanger Design
House
of Quality
Engineering
Design Specification
Project
Schedule
Finalized
Hanger Design
Instruction
of New Hanger Operation
Conclusion
Appendix
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A. Assembly Drawing
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B. Engineering Design Specification
Reference
Introduction
In 1869, O. A. North at the
United States, had
invented the first
shoulder-shaped wire hanger,
which is being popular
used nowadays.
Hanger
has being very important
of
household usage in our
daily. It can be used
to hang coat, shirt,
jacket or dress for
drying,
displaying
or
storing.
Hanger
characteristics can be
classified
into
two parts, which are
material and
size. The material
usage of hanger includes
wire, wood and plastic.
There are two standard ranges of size for different customers, which
are 30cm to 52cm
in length for
adult and 25cm to 41cm
in length for child.
Hanger has
been designed in different
size or
shape for different types
of clothing. For instance,
wooden hanger is normally
used
for hanging
suit or coat,
and the wire
hanger can be applied
for light weight clothing. However, we have
experienced
that the hanger is
difficult to hang
the sweater or
T-shirt directly. We
often need
to put it
inside through
the bottom.
Therefore, our
project has
to make a design that
improving
the normal hanger
which can
fit to
any
collar.
Existed
Product Design Problem Analysis
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Normal
Hanger
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We
have observed that the
collar size
of normal
clothing cannot
afford a hanger passing through it.
The normal hanger
is unable to hang
the sweater or
T-shirt directly.
If we
thrust it
inside through
the collar, it will lead
to a collar loose. It
will be inconvenience if
we put it inside
through the
bottom.
Sometimes
we may put the hangers together with a basket for storing. We may
face a problem that the hock of the hangers may clasp each other
and hence it will be inconvenience to take it out every time. It
may have to spend a lot of time to take apart from the clasped
hangers.
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Pinch
Hanger
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The
concept of this design is to pinch the hanger with the two
shoulders to fold and make it straighter. By reducing its size,
it can be easier to put it inside through the collar. The design
is based on the characteristic of plastic. Some of the plastic,
such as Polyethylene and Polystyrene, has a higher elasticity
that can be twisted. This product has applied Polyethylene for
its material, which is ductile and available to afford the burden
of bending. Besides, the hanger is designed in one piece.
The
problem is the hanger has to be twisted to fold. The middle of
the hanger will bear the highest load of twisting. Therefore, the
material should be flexible enough to afford the bending,
otherwise it may break. However, it may affect the performance of
hanging clothes. When a shirt is hanged by this product, the
shoulders will be sagged by the load, so it cannot handle some
heavier clothing such as coats and jackets. Another problem is
the hanger will deform after many times of bending, so it is not
durable enough.
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Folding
Hanger
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The design
problem of this hanger is the material usage of the joints. The
hanger has applied metal for the jointing parts. Sometimes we may
use hanger for hanging wet clothes. If the metal joints often
contact with water without well coated, there will be an
opportunity that the joints get rusted after a period of time.
The metal joints may lose its function and make the whole
structure be loose. It may affect the durability of the hanger.
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Umbrella
Hanger
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The
product has applied the concept of umbrella design.
The structure
of this product is a trunk connected
with certain
amount of branches.
The branches are able to swing through the paths of the bracket.
Clothes can be hanged on the branches when they spread.
However,
the size of this product is too large. The hanger may occupy
much space when using it. We have
observed that user
may find it difficult to put
it out
of the
window since the size leads the
hanger stick on the window frame. Consequently, the users have to
close the branches to make it smaller whenever they need to put
it through the window frame, and it will bring the users much
inconvenience.
Also,
the hanger cannot lies on the wall since the branches are propped
to the wall. It has restricted the
application of this hanger.
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Expectation
of New Hanger Design
By the analysis of the current
existed hanger product, we can conclude that the convenience is the
first factor that we have to consider. For the new design, we expect
that its size can be small enough to pass through the collar. At the
same time, it should be able to hang the clothing completely. We do
not allow any complicated process of usage. We hope that the user can
feel easy and directly to use it. Also, our hanger product should not
be allowed to damage or affect the quality of clothing, especially
preventing the loose of collar.
The size of the hanger is not
just predicting the collar, but also predicting if carry on or
storage. We expect that some users may bring along their own hangers
when traveling, or may want to save place of his/her housing. In
fact, the current existed hangers are almost fixed size. Their sizes
are typically 25cm
to 52cm
in length and 17-24 cm in height. If the quantity is large, it may
occupy many spaces for storage and hence difficult to carry them for
traveling. Therefore, the hanger should be allowed to adjust in a
smaller size.
Another major consideration is
its efficiency of hanging clothes. We hope that the new design can
maintain the hanging ability of typical hanger, which can afford to
hang the heavier clothing such as jackets or coats, but also able to
change its size at the same time. It’s a difficult part that the
structure should be well organized for bearing the load and
maintaining the whole structure.
We also consider the
environmental factors, such as temperature and humidity. Since the
users may use it to hang either wet or dry clothing, the metal parts
of this product should be well coated or organized without any
waterish contact.
House
of Quality
House of Quality (HOQ) is a group
method that used to do the analysis between the voice of the
customers and the corresponding engineering requirements.
We try to determine the direction of hanger design by this method.
We have collected the customer
responses of hanger product and try to understand their need for the
later evaluation. We also need to estimate the importance weights of
the specified requirements. Then we have to give some suitable and
feasible ideas corresponding to different needs. Afterward, we can
use HOQ to evaluate their importance by scoring the levels of
relation and correlation. Finally, we can conclude the specification
of the new design by the data and establish the path of design.
By the previous design problem
analysis of the existed hanger product, we can conclude the regular
customer requirements: 1.
Able to hang the clothing directly, 2. Smaller size, 3. Low price, 4.
Durable, 5. Antirust parts and assemblies, 6. Easy to use, 7. Light
weight, 8. Easy to carry on, 9. Easy to store
and 10. No clasping of
numerous hangers.
Target customers are mostly concerning in whether the hangers can be
allowed to hang the cloth through the collar, and the size of the
product. The other considerations are whether the hanger can be easy
to store and carry on. But in fact, these two problems can be solved
by minimizing the size of hanger, so these kinds of problem can be
terminated at the same time. We try to design a folding hanger which
can cross the collar easily. The folding feature and a simple
structure of hanger design can also solve the size problem.
Therefore, HOQ is very helpful in product analysis since it can
minimize these kinds of repeated factors and focus to the major
considerations.
Engineering
Design Specification
By giving the specified index of
importance in different customer requirements and scoring the
relations and correlations of the requirements, we now can identify
the design direction by referring the HOQ result. The estimated
result shows that simple structure and adjustable size are most
important to develop, and we have set them to be the targeted
objectives. To form a simple structure, the amount of parts and
assembles should be reduced to least. We suppose to make a hanger
within ten parts, and the parts will be simply designed without any
complicated shape and texture. It purposes to reduce the difficulty
of manufacturing, which may lead to a higher production cost and
increase customers’ financial burden.
There are different ways to make
the hanger adjustable in its size, even folding, twisting or
pinching. It is just a consideration of which can be applied and
perform the best hanging efficiency. Folding is the most popular
design concept that the designers ever use, but we should consider
the strength of the joints. It is because folding design may include
two or above parts, and the parts may not bear the load equally.
Twisting and pinching concepts are adaptable in one piece design, and
the load evaluation is much easier than folding design. However,
their hanging ability may also be affected. Therefore, for
engineering design, it is very important to make judgment among the
advantages and disadvantages.
Material selection is also very
important in hanger design. Different kinds of plastic own different
strength and deform level. Plastic can be brittle but hard, or
deformable but soft. Plastic selection depends on what product we are
designing and what features the design predicated to be.
Additionally, we try to create a hided hock design to avoid the
probability of clasping the hangers. Engineering Design will consider
all these factors and summarize a specified design proposal.
Project
Schedule
The project
schedule consists
of fourteen
tasks,
including the
start
and
finish
dates and the different
responders. The
tasks are estimated with
the duration, resource and
budget.
In the beginning, the
Marketing collects the
customer requirements and
passes
them to
the Design
and the Engineering. The
Design will do the hanger appearance design, and then pass it
to the Engineering.
The Engineering will
determine the product specification with considering the customer
requirements. After collecting
the product appearance
design by the Design, the Engineering will do
the engineering
design with the product
specification.
If
the customer
accepts
the finalized
design,
a prototype
will be prepared for
reviewing
the hanger features.
In the meantime, the
Marketing will
provide a
preliminary quotation to the customer. If
the prototype has been confirmed by the customer,
the Manufacturing
will do the
tool design
for production. At the
same time, the Design
will start the artwork and
packaging design. The design will be passed
to the Marketing
and seek the
customer’s
confirmation.
According to
the schedule, the tools
will be prepared
after two weeks. The
Manufacturing will
do the production and check the
off tool
sample with testing. The
off tool sample should claim
the Design and Engineering
verification.
The Marketing
will provide the finalized
quotation to the customer. If
all tasks are verified, the
Production will start the mass production.
Hanger
Development
Schedule
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Week
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Tasks
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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Responders
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Receive
the customer requirements and do the product appearance design
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Design
&
Marketing
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Determine
the product
specification
and do the engineering design
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Engineering
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Prepare
the
preliminary
quotation
to the customer
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Marketing
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Finalize
the product
design
and seek the
customer confirmation
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Design,
Engineering & Marketing
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Make
the prototype
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Manufacturing
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Review
the
prototype and
seek
the customer
confirmation
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Engineering
, Design & Marketing
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Tool
designing and making
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Manufacturing
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Packaging
design
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Design
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Artwork
design
and seek
the customer
confirmation
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Design
& Marketing
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Check
the off tool sample and testing
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Manufacturing
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Off
tool sample verification
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Design
& Engineering
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Prepare
the finalize
quotation
to the customer and seek the customer confirmation
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Marketing
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Prepare
mass production material
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Production
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Mass
production
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Production
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Finalized
Hanger Design
Our
final design is a folding hanger with eight parts. The design concept
of the hanger is making a path in the middle of the shoulders that
allow the shaft to move along which creates a folding feature. The
shaft is fixed on the right shoulder. To stabilize the shoulders, we
have designed a lockable shaft to fix them when the hanger is fully
extended. The shaft is composed by two plates with latch, spring and
screw. The screw is used to fix the plates on the shaft. The spring
purposes to push the latch upward. The shoulders will be locked when
the latch has pushed inside the notch of the left shoulder. The hock
and left shoulder are fixed among the plates and right shoulder. The
hock is able to rotate about the shaft, which is purposed to hide the
hock between the two shoulders.
Front
View
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Back
View
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Exploded
View
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Bill
of Material
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Item
no.
|
Part
name
|
Material
Type
|
Material
name
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Amount
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1
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Hook
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Plastic
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Polycarbonate
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1
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2
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Left
Shoulder
|
Plastic
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Polycarbonate
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1
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3
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Right
Shoulder
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Plastic
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Polycarbonate
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1
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4
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Front
Plate
|
Plastic
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Acrylonitrile
Butadiene Styrene (ABS)
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1
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5
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Bottom
Plate
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Plastic
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ABS
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1
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6
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Latch
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Plastic
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ABS
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1
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7
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Spring
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Metal
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Steel
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1
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8
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Screw
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Metal
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Steel
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1
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When designing
the parts which
are made with
plastic, it is not
only considering the magnitude of load,
but also considering their types and durability. Plastic has
different performance which
depends
on different
load and
environmental condition. It
is very difficult to predict the parts’ performance, so it is
recommended to make a
prototype and test
it in
different applications,
and evaluate
the durability
of the critical parts.
The cross
sectional
diameter of
the shaft
is 14mm and
the maximum load that
it can bear is 5kg. The
definition of strength is the weight divided by the cross
sectional area:
= P / A
= (5*9.81) / (3.14*(7)2)
= 7.32 Nmm2=1061.7psi
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The following
table lists the typical
values of
different
materials:
The tensile strength of
Polycarbonate is 10,000 psi. Therefore,
the material can afford
the above stress.
Instruction
of New Hanger Operation
When you want to hang your
clothing, you just need to put the folded hanger inside through the
collar and press
the button to release the lock. The
left shoulder
of hanger will slip along the path
and extend. The shoulder will be locked when the hanger is fully
extended. Finally, a
completed hanger is
already formed. The cloth can hang
the cloth without any
damage to the collar.
If you wish to take the
cloth, you just need to release the lock and let the left shoulder
slip back to the original position. Afterward, you can take the
folded hanger out of the collar.
When the hanger is not be
used, you
can hide the hook to avoid
any clasping
between the hangers.
Conclusion
Hanger is simple but it can be
variety. Actually, there are lots of things that can be improved of
typical hanger. We found that there are many types of hanger existed
in the market. To create an outstanding design, understanding the
competitive products’ weakness is very important. Therefore, we
have spent much in analyzing the existed product with understanding
their design concepts and problems. Our product is a variant design
that we try to do more improvement based on the typical one,
including the shape, size and appearance.
By this report, we can deeply
understand the flow of product realized process. We have to handle
each of the parts with considering the realistic needs in marketing,
designing, engineering, etc. We believe that our product can
fulfill the customer need
and compete in the market.
Appendix
A
Appendix
B
Product
Requirement Specification
Hanger
Version:
1.0
-
Authorization
|
Department
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Name
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Signature
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Sales
and Marketing
|
Jackie
Chan
|
|
Design
|
|
|
Engineering
|
Karl
Lam
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|
Manufacturing
|
John
Lee
|
|
Date: 5th
April, 2013
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Product
Image
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|
Product
Features
|
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Color
|
Pink
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Materials
|
Plastic
|
Packaging
|
Box
|
Dimension
|
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Length
(mm)
|
489.5±
1.0
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Width
(mm)
|
27.4
± 0.5
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Height
(mm)
|
167.5±
0.5
|
Customer
Requirements:
Can hang the cloth
directly through the collar
Smaller size
Low price
Durable
Antirust parts and
assemblies
Easy to use
Light weight
Easy to carry on
Easy to store
No clasping of numerous
hangers
Company
Requirements:
Simple
product structure
Easy to manufacture
Can be mass-produced
Low cost
|
Reference
Hanger
Picture -
Hanger
Size and Dimension –
House
of Quality –
Material
Characteristics –