An adjustable constant force mechanism using pin joints and springs

Patrice Lambert*, Just L. Herder

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

13 Citations (Scopus)


This paper presents a novel constant force mechanism based on a 11- revolute joints spatial linkage using simple pin joints and two regular springs. Passive linear sliders with ball bearings are not suitable for certain applications such as in medical environment or for miniaturization. Using only revolute joints in the mechanism allows for replacing all ball bearings with PTFE pin joints, which can be made smaller than ball bearings and are bio-compatible. Pin joints however have the disadvantage of generating friction, which can affect the quality of the constant force at the output link. This paper introduces the new pin joints constant force mechanism and presents an analysis of the effect of the friction generated by the joints on the output force.

Original languageEnglish
Title of host publicationNew Trends in Mechanism and Machine Science
Subtitle of host publicationTheory and Industrial Applications
EditorsPh Wenger, P Flores
Place of PublicationCham, Switzerland
ISBN (Electronic)978-3-319-44156-6
ISBN (Print)978-3-319-44155-9
Publication statusPublished - 2017
EventEUCOMES 2016 - Nantes, France
Duration: 20 Sep 201623 Sep 2016

Publication series

NameMechanisms and Machine Science
ISSN (Print)22110984
ISSN (Electronic)22110992


ConferenceEUCOMES 2016


  • Constant force mechanism
  • Friction
  • Pin joints
  • Spatial linkage


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