Prosthetic Arm Force Reducer Team 1 – Halliday's ... - Ohio University

hook is closed. The harness idea is one worth consideration but used in the manner
shown here it is doubtful that the gripping force needed in our application could be
achieved. A modification of this system could definitely be used in a future design.
3. Threewit, D. M., "Terminal Connection for Control Cables," U. S. Patent 2,493,841, January
10, 1950.
• Describes a means for attaching and operating a cable in order to open and close a
hook attached at the end of a prosthetic arm. A modification of this patent could be
used in conjunction with the above harness.
4. Radocy, R. and Dick, E., "Prosthetic Terminal Device," U. S. Patent 4,225,983, October 7,
1980.
• Describes a claw that is to imitate the gripping action of the thumb and forefinger.
The device is closed through the use of an attached cable and is spring-loaded to
return to the open position. The device utilizes two manual locking devices and three
gripping surfaces to provide a variety of closed positions that allow for the grasping
of objects of different sizes.
5. Landsberger, S. L., "Artificial Hand For Grasping an Object," U. S. Patent 7,087,092,
August 8, 2006.
• Describes an alternative gripping device that utilizes two “fingers” which are
connected to a “thumb.” This device resembles the human hand except in uses three
“fingers” instead of five.
6. Farquharson, R. H. and Still, D. P., "Attachment for Artificial Arm Prosthetic Device," U. S.
Patent 5,464,444, November 7, 1995.
• Describes a terminal device comprises of a first main part in operable and pivotal
combination with a second main part, the combined main parts providing on one end
a device for attaching to the end of an arm prosthesis, and on the other a device for
attaching a variety of implements, the said device for implement attachment
providing articulation capabilities that allow positioning of the implements in a
variety of positions relative to the position of the arm prosthesis.
7. Zajac, T. S., “Device for Gripping Workpieces,” U.S. Patent 4,591,199, May 27, 1986.
• Describes a device for which fluid pressure is applied to opposite pistons connected
to a gripping jaw hence moving the jaws open and closed. A rod extending along the
axis of the two cylinders which is interconnected to the pistons is the means for
synchronous movement. The interconnection affects rotation of the rod in opposite
directions upon movement of the pistons with a bearing assembly located between the
two fluid cylinders supporting the rod for rotation. The MAGNUM Parallel Grippers
(Fig. 4.1.7) utilize this patent.
4.3 Applicable Standards
There are Quality Standards set for suppliers of Durable Medical Equipment, Prosthetics,
Orthotics, and Supplies (DMEPOS). The organization recommends that the supplier of a custom
fabricated, custom fitted, custom-made prosthetic device be trained in a wide variety of treatment
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