Assignment ergonomic hammer
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By……
Pankaj Tadaskar (70)
Sapanjit Mohanty (88)
Sunit Mhasade (105)
Sumeet Suman (106)
Sanjay Jena (120)
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HISTORY
Use of simple tools
dates to about
2,400,000 BCE
Stones attached to sticks with strips of leatheror animal sinew were being used as hammersby about 30,000 BCE during the middle of thePaleolithic Stone Age (era distinguished by thedevelopment of the first stone tools)
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OLD HAMMER DESIGN
A hammer is a tool meant to deliver an impact to an object
The most common uses are for driving nails, fitting parts, forging metal and breaking up objects
Hammers are often designed for a specific purpose, and vary widely in their shape and structure
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The usual features are a handle
and a head, with most of the
weight in the head
The basic design is hand-
operated, but there are also many
mechanically operated models for
heavier uses, such as steam
hammers
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BAD DESIGN
Incorrect material may cause breakage of hammer
and may injure operator
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BAD DESIGN
Improper use of Hammer can damage muscles and tendons
of hand.
Repetitive hammering can cause constriction of blood
vessels resulting in reduced blood flow in hand (numbness &
tingle)
Optimum ration of force o/p to i/p
Large ratio injures worker
Smaller ratio causes repeated
involvement of hand and
chances of CTD (cumulative
trauma disorder)
Vibration In hands
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Lesser contact area between hand and handle may cause compressive stress
As the impact between steel hammer heads and theobjects being hit can, and does, create sparks, whichin some industries such as underground coal miningwith methane gas, or in other hazardousenvironments containing flammable gases andvapours, can be dangerous and risk igniting thegases.
In these environments, a variety of non-sparkingmetal tools are used, being principally, aluminium orberyllium copper-headed hammers..
BAD DESIGN
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ERGONOMIC CONSIDERATION WHILE
DESIGNING HAMMER
The handles have been made of durable
plastic or rubber
The hammer varies at the top; some are
larger than others giving a larger surface
area to hit different sized nails
Material used for hammer is beryllium
copper-headed hammers
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ERGONOMIC HAMMER
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Hammer is ergonomically designed to suit industrial purpose and carpentry
The hammer produces a cushioned blow and the impact surfaces are round and slightly domed
A specially developed polymaterial makes the hammer highly effective and gives it a long life
Sparkless, antistatic and free from magnetism
ERGONOMIC HAMMER
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The Hammer’s weight is approx 25% lower than that of a conventional hammer
The head accounts for approx. 65% of the weight of the hammer
Serve both as screw driver and a hammer as a single tool so consume less space.
This gives the Hammer an excellent impact effect and the weight distribution
The hammer shaft is shaped to give a hefty and precise grip
The Hammer therefore fulfils the most stringent requirements for ergonomics, safety and function.
ERGONOMIC HAMMER
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ERGONOMIC HAMMER
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Head: The balance-weighted head is outfitted with a large and small mallet constructed of TPR for precise percussions.
Handle: The ergonomic handle is precisely balanced for increased control of force in the percussions to elicit myotatic reflexes
TIP:of the base of the handle effectively elicits cutaneous and plantar reflexes.
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A
B
C
D
E
F
LEAD HEAD
EASY-GRIP HANDLE
SCREW THREAD
PROPOSAL OF HAMMER
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MODEL A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) WEIGH
T (kg)
X 70 50 45 65 220 35 0.75
Y 70 50 45 65 220 30 0.80
X: Hammer combination with general screw driver
Y:Hammer combination with specific purpose screw driver
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REFERENCES
http://www.coroflot.com
http://www.eaglemoldcompany.com
www.sunnex.com
www.wikipedia.com
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