TY - JOUR

T1 - The spring-and-lever balancing mechanism, George Carwardine and the anglepoise lamp.

AU - French, M. J.

AU - Widden, M. B.

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PY - 2000

Y1 - 2000

N2 - Two short and direct methods of exact analysis of the spring-and-lever balancing mechanism are presented. It is shown that perfect balance can be achieved by the use of a close-coiled spring whose free length is effectively zero and whose stiffness is chosen appropriately. The two-degree-of-freedom balancing mechanism, commonly seen in desk lamps but useful in many other situations, is then analysed. The treatment is extended to allow for the weight of the components of the mechanism itself. The originator of these devices was George Carwardine, whose patents over the period 1931-35 show the evolution of his ideas on this subject. A short biographical note is included as an appendix.

AB - Two short and direct methods of exact analysis of the spring-and-lever balancing mechanism are presented. It is shown that perfect balance can be achieved by the use of a close-coiled spring whose free length is effectively zero and whose stiffness is chosen appropriately. The two-degree-of-freedom balancing mechanism, commonly seen in desk lamps but useful in many other situations, is then analysed. The treatment is extended to allow for the weight of the components of the mechanism itself. The originator of these devices was George Carwardine, whose patents over the period 1931-35 show the evolution of his ideas on this subject. A short biographical note is included as an appendix.

KW - balancing mechanism

KW - equilibrator

KW - constant force

KW - Carwardine

U2 - 10.1243/0954406001523137

DO - 10.1243/0954406001523137

M3 - Journal article

VL - 214

SP - 501

EP - 508

JO - Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science

JF - Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science

SN - 2041-2983

IS - 3

ER -