Straight Line Mechanisms

This topic is simply a list of some of the important Straight-Line Mechanisms. Not Mechanism Synthesis.

They are included for reference.

A.Straight-Line Mechanisms with Pin-Joints only

In each image, the Pin-Joints are given a letter. The input joint is at A. You can scale each mechanism from the relative lengths of each Part. The Point at letter 'K' is the coupler point and it moves in a straight-line.

B.Straight-Line Mechanisms with Pin and Slide-Joints

There are also straight-line mechanisms that have a Slide-Joint! This might seem ridiculous as why produce a straight-line with a mechanism when it should be easy to use the linear slider directly!

However, when the slide-joint moves only a short distance as compared to the distance the coupler point moves, then they are useful.

Also, they are sometimes useful to change the straight-line motion to a different direction.

Straight-Line Mechanism with Pin-Joints Only

See YouTube video http://youtu.be/JlGKZCus6iw

Wat Straight Line Mechanism / Linkage

Watt

Straight-Line Watt - Pop-up

AB=-BC=CD=L

AD(δx) = 2L

AD(δy)=L

BK=CK=0.5L

Roberts Straight Line Mechanism / Linkage

Roberts

Strain-Line Roberts Pop-up

AB=CD=AD=BK=CK=2L

BC=L

 

Thebysheff's Straight Line Mechanism Linkage

Tchebycheff & Translating

AB=CD=2.5L

AD=2L

BC=L

BK=0.5L

FK is the Translating Part.

CE=EF=1.25L ; FK=L

Modiefed Scott Russell Straight Line Mechanism / Linkage

Modified Scott Russell

AB*BC=BK2

CD= longer the better

Hoeken Straight Line Mechanism / Linkage

Hoeken

AC=L

AB=2L

BD=CD=2.5L

D.K=2.5L

 

Peaucellier Exact Straight Line Mechanism / Linkage

Peaucellier 1 - EXACT STRAIGHT LINE

AD=DC=1L

AB=AE=2.5L

BC=BK=CE=EK=1.2L

Peaucellier Inverse Straight Line Mechanism / Linkage

Peaucellier 2 - Inverse - EXACT STRAIGHT LINE

AD=AB=1L

DC=DE=1.25L

BC=CK=BE=EK=1.5L

Kempe Straight Line Mechanism / Linkage

Kempe 1

AB=BC=DC=AD=2L

AE=EC=EK=1L

CF=FK=0.5L

Kempe 2 Straight Line Mechanism / Linkage

Kempe 2

AB=DC=BE=CF=CK=1L

AD=BC=EF=AK=2L

GK=FG=0.5L

Notice that four Parts are Blue - this means that MechDesigner solves their postilions, but not with closed loop equations.

Hart 2 Straight Line Mechanism / Linkage

Hart

AB=AD=3L

BC=DC=6L

AE=L

EG=4L

DF=GF=FK=2L

Hart Exact Straight Line Mechanism / Linkage

Hart - EXACT STRAIGHT LINE

AB=AD=1L

DC=DE=1.4L

BC=BF=EK=3L

EG=6L

FG=2.8

Trnaslating Table and Straight Line Mechanism / Linkage

Translating Table - or Engineers Table

Straight Line Mechanisms with Pin-Joints and Slide-Joints

Scott Russel Straight Line Mechanism / Linkage

Scott Russell

AB=BC=BK

CD= ∞ (D @ infinity -Y)

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