Overal Strength | Men (N) | Men(lbs) | Female(N) | Female(Lbs) |
Pushing | 185 | 41.6 | 126 | 28.3 |
Pulling | 232 | 52.2 | 178 | 40.0 |
Table indicates that pulling strength is greater than pushing strength. This test was run for 3 hours on each participant with over a minute rest between each interval.
Human Factors notes
Reference:
(Valerie J. Berg Rice, 1998, Ergonomics in Health Care and Rehabilitation, Woburn, MA, Butterworth-Heinemann)
Study focused on 2 main points:
Structural anthropometric measurements for male and female paraplegics
Isometric strength profiles in the workplace for male and female paraplegics
Subjects:
42 males and 20 females with spinal cord injuries
Procedure:
16 structural anthropometric dimensions:
Seated stature
Eye height
Shoulder height forearm height
Knee height
Toe height
Max reach height
Overhead reach height
Normal reach
Radial arm reach
Max reach
Trunk depth
Bideltoid width
Acromion width
Elbow width
Overall length
Men – 39.1 Females – 37.3
Years in wheelchair
Men – 11.6 Female – 12.7
Elbow width |
626 |
57 |
533 |
626 |
720 |
523 |
720 |
Overall Length |
1127 |
64 |
1022 |
1127 |
1216 |
985 |
1246 |
Note: All Dimensions are in millimeters (Table got cut off in copier so last 2 rows were added back in)
A few key findings for our project are the following (Meas. from seat)
Normal Reach: Men – 488mm or 1.6 ft, Female – 450mm or 1.5ft
With Max Reach: Men - 853mm or 2.8 ft, Female – 768 mm or 2.5ft
Shoulder Height: Men – 572mm or 1.9ft, Female – 510mm or 1.7ft
Eye Height: Men – 735mm or 2.4ft, Female – 645mm or 2.1ft
Trunk Depth: Men – 240mm or .78ft, Female – 182mm or .60ft
In this study they did push, pull, push up and pull down measurements of strength. For our purpose we are mainly interested in the push and pull strengths.
Pull and Push Strengths
From these last 4 tables the first data that can be used is the overall strength found in each table. The results are as follows.
Conclusion of Human Factors research
In all my research this looks like the best starting point for being able to see approximately how much force in what range of motions we can expect to be able to see in our tricycle. It also gives us plenty of measurements to be able to insure our passengers can fit comfortably in the vehicle. With both wen and women variables we can hopefully make this vehicle adjustable to accommodate a wide range of average adults, both men and women.
Matt Pulling Chris through mud |
Spring scale friction measurment through mud |
Spring scale measurment through sand |
The depth of the sand after the bike passed through |
Matt pulling Chris on pavement using a spring scale |
Force of friction from a paved road |
height= 16 inches |
Length of the ramp, 195 inches | Chris being pulled up the Cuttler Health Center ramp |
8inch Stability of the trike |
Going down the ramp |
Matt Pulling Chriss up on a ramp at an angle of 4.6deg useing Spring Scale |
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