Six-bar linkage having symmetrical displacement curve

Claim 2

A six-bar linkage for converting rotary motion of a driving link to rectilinear motion of the pivot connecting a first intermediate link with a second intermediate link having a stroke length equal to a predetermined segment of a line comprising a driving link having a length equal to one-half of said stroke length; said driving link being connected to a fixed pivot point, said fixed pivot point lying on an extension line of said predetermined segment of line including said stroke; said first intermediate being a first coupler line connected to said driving link and having a length equal to the sum of the driving link and the distance between the fixed pivot point and the adjacent end of said segment of a line, and said extension line provided as a reference for an angular measure theta of said driving link whereby a symmetrical displacement curve is provided.

Claim 3

A six-bar linkage according to claim 1 wherein said linkage comprises first link means having a three-sided form with the sides terminating in points and two of said points being fixed to be stationarily positioned; said driving link provided as a second link means attached to the said one of said fixed points; third link means attached to the other of said fixed points, said third link means being a driven link rotatable through an angle phi ; fourth link means having a three-sided form with the sides terminating in points; said coupler link provided as a fifth link means extending between a point of said fourth link means to provide the rectilinear motion and a rotatable end of said driving link; sixth link means formed as a link extending between an unfixed point of said first link means and a second point of said fourth link means; and a rotatble end of said third link means being attached to a third point of said fourth link means whereby rotation of said driving link through the angle theta provides the symmetrical displacement curve desired from back and forth angular rotation of said third link means through said angle phi and the rectilinear movement of said point on said fourth link means.

Claim 4

A six-bar linkage according to claim 2 wherein rotation of said driving link and said link means provides the following angular relationships: theta 0*90*180*270*360* phi 0*42*71*31''42*0*

Claim 5

A six-bar linkage for converting rotary motion of a driven link to rectilinear motion of a given point on the linkage and having a given stroke length, comprising first and second ternary links, driving and driven links pivoted to separate points of said first ternary link, and intermediate link pivoted to the other end of said driving link, theother ends of said driven link and intermediate link being pivoted to separate points of said second ternary link whereby the pivot points between said intermediate link and said second ternary link define said given point, and further link pivoted between further points of said first and second ternary links, said driving link having a length equal to half of the stroke length, said intermediate link having a length equal to the sum of said stroke length and the length of said driving link, the angular displacement of said driven link being symmetrical with respect to the angular displacement of said driving link from a given angular position of the driving link, said rectilinear motion of said given point extending along a straight line passing through the pivotal connection between said driving link and said first ternary link, which straight line corresponds to said given angular position of said driving link.

Claim 6

A six-bar linkage for converting rotary motion of a driven link to rectilinear motion of a given point on the linkage and having a given stroke length, comprising first and second ternary links, driving and driven links pivoted to separate points of said first ternary link, and intermediate link pivoted to the other end of said driving link, theother ends of said driven link and intermediate link being pivoted to separate points of said second ternary link whereby the pivot points between said intermediate link and said second ternary link define said given point, and further link pivoted between further points of said first and second ternary links, said driving link having a length equal to half of the stroke length, said intermediate link having a length equal to the sum of said stroke length and the length of said driving link, the angular displacement of said driven link being symmetrical with respect to the angular displacement of said driving link from a given angular position of the driving link, said rectilinear motion of said given point extending along a straight line passing through the pivotal connection between said driving link and said first ternary link, which straight line corresponds to said given angular position of said driving link.

Claim 7

The six-bar linkage of claim 4, wherein the angular displacement phi of the driven link is defined by the angular displacement theta of said driven link by the relationship: phi 0.4666666 theta - 0.04415076 theta (0 - pi /2) - 0.03493704 theta (0 - pi /2) ( theta - pi ) + 0.01112081 theta ( theta - pi /2) ( theta - 3 pi /2).