The recent introduction and advancements in design of simple, constant-force mechanisms have created the potential for small-scale, low-cost, constant-force electronic connectors (CFECs). CFECs differ from traditional connectors by the separation or disassociation of contact normal force and contact deflection. By removing the traditional constraints imposed by forces and deflections that are dependent on each other, new types of electronic connectors can be explored. These new designs may lead to smaller and more reliable electronic connectors. In this paper, constant-force mechanisms are adapted to satisfy current industry practices for the design of electronic connectors. Different CFEC configurations are explored and one is selected, prototyped, and used as a proof-of-concept connector for a personal digital assistant (PDA) docking station. The modeling, optimization, and verification of the prototype CFEC is presented. Adaptation of constant-force technology to electronic connectors creates new possibilities in electronic connector designs, including allowing an optimal contact force to be utilized to decrease the effects of fretting and wear, lowering required manufacturing tolerances, reducing the system’s sensitivity to variations introduced by the user, and increasing the system’s robustness in applications where movement or vibrations exist.

1.
Deshpande
,
A.
, and
Subbarayan
,
G.
, 2000, “
LGA Connectors: An Automated Design Technique for Shrinking Design Space
,”
ASME J. Electron. Packag.
1043-7398,
122
, pp.
247
254
.
2.
Antler
,
M.
, 1999, “
Tribology of Electronic Connectors: Contact Sliding Wear, Fretting, and Lubrication
,”
Electrical Contacts
,
P. G.
Slade
, ed.,
Marcel Dekker
,
New York
, Chap. 6.
3.
Holm
,
R.
, 1999,
Electric Contacts: Theory and Application
, 4th ed.,
Springer Verlag
,
New York
.
4.
Burwell
,
J. T.
, and
Strang
,
C. D.
, 1952, “
On the Emprical Law of Adhesive Wear
,”
J. Appl. Phys.
0021-8979,
23
(
1
), pp.
18
28
.
5.
Burwell
,
J. T.
, and
Strang
,
C. D.
, 1952, “
Metallic Wear
,”
Proc. R. Soc. London, Ser. A
1364-5021,
212
, pp.
470
477
.
6.
Archard
,
J. F.
, and
Hirst
,
W.
, 1956, “
The Wear of Metals Under Unlubricated Conditions
,”
Proc. R. Soc. London, Ser. A
1364-5021,
236
,
397
410
.
7.
Harper.
,
C. A.
, 1996,
Electronic Packaging & Interconnection Handbook
, 2nd ed.,
McGraw-Hill
,
New York
.
8.
Brush Wellman Inc.
, 1999,
Connector Engineering Design Guide: Material Selection in the Design of Spring Contacts and Interconnections
,
Brush Wellman Inc.
,
Cleveland, OH
.
9.
Nathan
,
R. H.
, 1985, “
A Constant Force Generation Mechanism
,”
ASME J. Mech., Transm., Autom. Des.
0738-0666,
107
, pp.
508
512
.
10.
Wahl
,
A.
, 1963,
Mechanical Springs
, 2nd. ed.,
McGraw-Hill
,
New York
.
11.
Williman
,
J.
, 1995, “
Small Torque
,”
Engineering (London)
,
Gillard Welch Associates
,
London, England
, pp.
27
28
.
12.
Jenuwine
,
J. G.
, and
Midha
,
A.
, 1994, “
Synthesis of Single-Input and Multiple-Output Port Mechanisms With Springs for Specified Energy Absorption
,”
ASME J. Mech. Des.
1050-0472,
116
(
3
), pp.
937
943
.
13.
Bossert
,
D.
,
Ly
,
U. L.
, and
Vagners
,
J.
, 1996, “
Experimental Evaluation of a Hybrid Position and Force Surface Following Algorithm for Unknown Surfaces
,”
Proceedings-IEEE International Conference on Robotics and Automation
,
IEEE
,
New York
,
3
, pp.
2252
2257
.
14.
Chang
,
L. H.
, and
Fu
,
L. C.
, 1997, “
Nonlinear Adaptive Control of a Flexible Manipulator for Automated Deburring
,”
Proceedings—IEEE International Conference on Robotics and Automation
,
IEEE
,
New York
, Vol.
4
, pp.
2844
2849
.
15.
Howell
,
L. L.
,
Midha
,
A.
, and
Murphy
,
M. D.
, 1994, “
Dimensional Synthesis of Compliant Constant-Force Slider Mechanisms
,”
Proc. of DETC’94, ASME Design Engineering Technical Conferences
,
ASME
,
New York
, ASME Paper No. DETC98/MEMD-71.
16.
Midha
,
A.
,
Murphy
,
M. D.
, and
Howell
,
L. L.
, 1995, “
Compliant Constant-Force Mechanism and Devices Formed Therein
,” U.S. Patent 5,649,454, Issued July 22, 1997.
17.
Millar
,
A. J.
,
Howell
,
L. L.
, and
Leonard
,
J. N.
, 1996, “
Design and Evaluation of Compliant Constant-Force Mechanisms
,”
Proc. of 1996 ASME Design Engineering Technical Conferences and Computers in Engineering Conference
,
ASME
,
New York
, ASME Paper No. 96-DETC/MECH-1209.
18.
Weight
,
B. L.
, 2001, “
Design of Constant-Force Mechanisms
,” Thesis, Brigham Young University, Provo.
19.
Murphy
,
M. D.
,
Midha
,
A.
, and
Howell
,
L. L.
, 1994, “
Methodology for the Design of Compliant Mechanisms Employing Type Synthesis Techniques With Example
,”
Proc. of 1994 ASME Mechanisms Conference
,
ASME
, NDE-Vol.
70
, pp.
61
66
.
20.
Howell
,
L. L.
, 2001,
Compliant Mechanisms
,
Wiley
,
New York
.
21.
Evans
,
M. S.
, and
Howell
,
L. L.
, 1999, “
Constant-Force End-Effector Mechanism
,”
Proc. of IASTED International Conference, Robotics & Applications
, Santa Barbara,
ACTA Press
,
Calgary, AB Canada
, pp.
250
256
.
22.
Boyle
,
C. L.
, 2001, “
A Closed-Form Dynamic Model of the Compliant Constant-Force Mechanism Using the Pseudo-Rigid-Body Model
,” M.S. thesis, Brigham Young University, Provo.
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