Dynamic Motion Visualization 11 x 17 Posters
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Transcript of Dynamic Motion Visualization 11 x 17 Posters
HOSENOZZLETIM TOCCI | PROF. V.P. HJELTNESS | 10 JAN 2010IDUS 221: HUMAN FACTORS IN INDUSTRIAL DESIGN
ENVIRONMENTALCONSIDERATIONS
USAGESEQUENCE
In addition to considering the user’s anthropometry, attention must also be given
to the task and the environment in which the user will be working. Initially, a
competitive product comparison is conducted to research exisiting options for
the current hose nozzle market (see next page). The benefits and impediments of
representative models are discussed and design opportunities are delineated from
that analysis. Next the process of watering is analyzed and the dynamic muscle
groups are determined by creating usage sequence diagrams. Additionally,
research is conducted to determine the likely injuries and the effect of design on
those injuries. Finally, conclusions are drawn from the results.
Shown below are the typical exercises performed while using a standard garden hose nozzle. The diagrams depict (1) lifting the nozzle off
the ground with a distributed load from the hose itself growing as it is lifted, (2) changing the elevation of the nozzle in the y direction, (3)
changing the angle of the nozzle in the x-z plane (rotate about y-axis), (4) changing the rotation of the nozzle (rotate about the x axis)
erector spinae
bicep
deltoid (medial)
1 2 3 4
y
x
z
bicep
gluteusmaximus
hamstring
metacarpalflexors
forearmflexors
forearm flexors
latissimusdorsi (lats)metacarpal
flexors
bicep
forearm flexors
deltoid (posterior)
metacarpalflexors
tricep
forearmflexors
deltoid (medial)
metacarpalflexors
trapezius
d
b
COMMONINJURIES
c
a
Common injuries that occur while using a hose nozzle include lower back injuries (see 1.a),
carpal tunnel syndrome (see 2.b), shoulder impingement injuries (see 3.c), and tendonitis
such as lateral epicondylitis (tennis elbow, see 4.d).i Lower back injuries are typically
caused by stiff muscles and improper lifting technique—lifting with the back instead of
with the legs. Carpel tunnel and tennis elbow injuries are the resultants of repetitive
motion,ii such as sweeping a nozzle while watering the garden. Shoulder impingement
injuries can also occur as the result of reptitive motion, especially for overhead
movements.iii Many of these injuries could be avoided by an ergonomic design which
suggests proper use and eliminates fatigue through a trigger locking device.
HOSENOZZLETIM TOCCI | PROF. V.P. HJELTNESS | 21 JAN 2010IDUS 221: HUMAN FACTORS IN INDUSTRIAL DESIGN
PRODUCTCOMPARISON
PHASE2CONCLUSIONSThe results from the analysis indicate that an ergonomic garden hose nozzle should account for repetive watering motions such as sweeping, rotating,
elevating, and lowering the nozzle. In consideration of these motions and common injuries associated with gardening, experiments will be conducted in
phase 3 to determine the limits of these motions. Finally, competitive product analysis reveals the simplicity and durability are key consumer values.
Gilmour Zinc Pistol Grip Dramm Revolver Bon-Aire Ultimate Hose Nozzle Orbit XL-Stream Nozzle
To understand the existing market and avoid reinventing the wheel, a
simple competitive product analysis is performed. Initially I visited Home
Depot to examine the tactile features of the respective nozzles. After
reviewing their physical properties and basic functionality, I continued
my analysis by researching the products online to determine how users
are responding to the various designs. Surprisingly, users seem to be the
most disappointed in the most expensive model, suggesting that
satisfaction and price are not correlated when purchasing a hose nozzle.
price
user rating
materials
features
pros
cons
remarks
$25.38 (amazon)
| 6 reviews
metal, polymer handle
adjustable spray
concentration and volume
via rings
firehose nozzle emulation
leads to more control
requires two hands to turn
nozzle on and off
bale (u-shaped lever) helpful
for arthritic gardeners, poor
customer reviews
$14.99 (amazon)
| 191 reviews
aluminum, stainless steel,
fiberglass, rubber
five-pattern spray nozzle,
two-way shut off
triggerless design leads to
reduced grip fatigue
no instant off
1-year warranty, positive user
reviews
Current designs offer a trigger-locking
function by means of a triangular wire which
can be rotated to prop the handle in the
open position. Unfortunately, placement of
this feature requires either two hands or a
long and adroit index finger. An easier
locking mechanism could resemble the
safety feature on a firearm, where a cylinder
is positioned by either the thumb or index
finger. Another solution could resemble the
pinky finger loop shown above.
$11.84 (amazon)
| 16 reviews
die-cast metal,fiberglass lever,
elastomer grip
nine-pattern spray nozzle: fan,
cone, center, jet, mist, soaker,
flat, angle, and shower
variety of spraying options for
multiple watering tasks
durability concerns: powder
coated finish fades, plastic
inner parts wear out
lifetime guarantee, 6 color
options, positive user reviews
$7.08 (amazon)
| 3 reviews
zinc body, brass stem
male threaded nozzle cap,
trigger-lock
inexpensive, conventional
design leads to consistency
grip can be slippery when wet
and become uncomfortable
after long periods of use
trigger requires two hands,
positive user reviews
DESIGNOPP