ERGONOMIC HAMMER DESIGN

By……Pankaj Tadaskar (70) Sapanjit Mohanty (88)

Sunit Mhasade (105)Sumeet Suman (106)Sanjay Jena (120)

HISTORY

Use of simple tools dates to about 2,400,000 BCE

Stones attached to sticks with strips of leather or animal sinew were being used as hammers by about 30,000 BCE during the middle of the Paleolithic Stone Age (era distinguished by the development of the first stone tools)

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

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

BAD DESIGN

Incorrect material may cause breakage of hammer and may injure operator

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

Lesser contact area between hand and handle may cause compressive stress

As the impact between steel hammer heads and the objects being hit can, and does, create sparks, which in some industries such as underground coal mining with methane gas, or in other hazardous environments containing flammable gases and vapours, can be dangerous and risk igniting the gases.

In these environments, a variety of non-sparking metal tools are used, being principally, aluminium or beryllium copper-headed hammers..

BAD DESIGN

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

ERGONOMIC HAMMER

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

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

ERGONOMIC HAMMER

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. 

A

B

C

D

E

F

LEAD HEAD

EASY-GRIP HANDLE

SCREW THREAD

PROPOSAL OF HAMMER

SPECIFICATIONS

MODEL

A(mm)

B(mm)

C(mm)

D(mm)

E(mm) F(mm) WEIGHT (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 driverY:Hammer combination with specific purpose screw driver

REFERENCES

http://www.coroflot.com http://www.eaglemoldcompany.com www.sunnex.com www.wikipedia.com