Apparatus for straight line oscillation of a wire guide

Claim 2

In apparatus for wrapping prestressing wire about a bevel pipe core with the spacing between adjacent wire wraps at the bevel end of said core varying from a maximum at the long side of said core to a minimum at the short side thereof, including means for rotating said core about the longitudinal axis thereof, a wire feed carriage, means for moving said carriage along a path parallel to the axis of rotation of said core at a speed proportional to the rotational speed of said core about said axis, wire guide means mounted on said carriage, and means for oscillating the wire guide means relative to said carriage as said carriage moves along said core adjacent said bevel end thereof to vary the spacing between adjacent wire wraps, the improvement wherein the means for oscillating said wire guide means comprises: a. a linkage system including a feed link carried by said wire feed carriage, b. means mounting said wire guide means on said feed link, and c. means for oscillating said feed link with said guide means moving parallel to said rotational axis of said core.

Claim 3

The apparatus of claim 1 wherein: a. said linkage system is a pantograph and said wire feed link is one link thereof.

Claim 4

The apparatus of claim 2 wherein said pantograph further comprises: a. a guide link, b. a spacer link, c. meaNs pivotally mounting said guide and spacer links on said carriage for pivotal movement about a pivot point fixed with respect to said carriage, d. a drive link pivotally attached to said spacer link at a point thereon spaced from the pivotal connection of said spacer link to said carriage, e. means pivotally attaching said wire feed link to said guide link at a point thereon spaced from the pivotal connection of said guide link to said carriage, and f. means pivotally attaching said drive link to said feed link at a point intermediate the pivotal attachment of said guide link thereto and said wire guide means.

Claim 5

The apparatus of claim 3 wherein said oscillating means comprises: a. means engaging said drive link at a point thereon intermediate the points of pivotal attachment thereof to said spacer link and feed link.

Claim 6

The apparatus of claim 4 further comprising: a. means for restraining said point on said drive link against movement in directions other than parallel to said core axis.

Claim 7

The apparatus of claim 5 wherein: a. said point on said drive link lies substantially on a straight line connecting said pivot point fixed with respect to said carriage and said guide means.

Claim 8

The apparatus of claim 4 wherein said means engaging said drive link comprises: a. a double acting piston and cylinder, b. a piston rod attached to said piston and projecting from said cylinder, and c. means interconnecting said piston rod and said drive link at said point thereon.

Claim 9

In apparatus for wrapping prestressing wire about a bevel pipe core including means for rotating a core about its axis and a carriage movable along a path parallel to said axis the improvement comprising: a. a supporting framework mounted on said carriage, b. a double acting piston and cylinder including a piston rod attached to said piston and projecting outwardly of said cylinder mounted on said framework, c. a source of fluid under pressure, d. means for directing said fluid into said cylinder on opposite sides of said piston, e. means for controlling said fluid directing means in response to the desired spacing of wire wraps on said core, f. a drive link pivotally attached intermediate its ends to an outwardly projecting end of said piston rod, g. track means mounted on said framework and extending parallel to said axis of rotation of said core, h. means attached to said drive link at said point of attachment thereof to said piston rod and movable along said track means only in a direction parallel to the axis of rotation of said core, i. a spacer link pivotally attached at one end to said supporting framework and at an opposite end thereof to one end of said drive link, j. a guide link pivotally attached at one end thereof to said supporting framework at the point of attachment of said spacer link to said framework, k. a feed link pivotally attached at one end to an end of said guide link opposite said one end thereof, l. means pivotally attaching said feed link intermediate its ends to an end of said drive link opposite said one end thereof, and m. guide means mounted on an end of said feed link opposite said one end thereof.

Claim 10

In apparatus for wrapping prestressing wire about a bevel pipe core including means for rotating a core about its axis and a carriage movable along a path parallel to said axis the improvement comprising: a. a supporting framework mounted on said carriage, b. a double acting piston and cylinder including a piston rod attached to said piston and projecting outwardly of said cylinder mounted on said framework, c. a source of fluid under pressure, d. means for directing said fluid into said cylinder on opposite sides of said piston, e. means for controlling said fluid directing means in response to the desired spacing of wire wraps on said core, f. a drive link pivotally attached intermediate its ends to an outwardly projecting end of said piston rod, g. track means mounted on said framework and extending parallel to said axis of rotation of said core, h. means attached to said drive link at said point of attachment thereof to said piston rod and movable along said track means only in a direction parallel to the axis of rotation of said core, i. a spacer link pivotally attached at one end to said supporting framework and at an opposite end thereof to one end of said drive link, j. a guide link pivotally attached at one end thereof to said supporting framework at the point of attachment of said spacer link to said framework, k. a feed link pivotally attached at one end to an end of said guide link opposite said one end thereof, l. means pivotally attaching said feed link intermediate its ends to an end of said drive link opposite said one end thereof, and m. guide means mounted on an end of said feed link opposite said one end thereof.