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US 6,330,903 B1Granted
Mechanism for constant balance with method for manufacture of variable pitch screw
OwnerSteve Weinreichinventor
Life of this patent
Estimating the term…
Abstract
A variable pitch screw is manufactured by twisting a prepared blank to the desired shape. The blank varies along its length such that it naturally twists to the desired shape.
Claims3
A method of manufacturing a variable pitch screw in combination with a follower comprising the steps of:
- preparing a workable bar with varying cross-sectional dimensions along its longitudinal axis;
- retaining the bar within first and second retaining means;
- rotating the first and second retaining means, at least 360 degrees relative to one another, about the longitudinal axis of the bar, whereby the bar becomes twisted with a varying pitch;
- and joining a follower with the bar to cooperate with the varying pitch of the twisted bar.
1 more element
A method of manufacturing a variable pitch screw in combination with a follower comprising the steps of:
- preparing a workable bar with varying density along its longitudinal axis;
- retaining the bar within first and second retaining means;
- rotating the first and second retaining means, at least 360 degrees relative to one another, about the longitudinal axis of the bar, whereby the bar becomes twisted with a varying pitch;
- and joining a follower with the bar to cooperate with the varying pitch of the twisted bar.
1 more element
A method of manufacturing a variable pitch screw in combination with a follower comprising the steps of:
- preparing a workable bar with varying hardness along its longitudinal axis;
- retaining the bar within first and second retaining means;
- rotating the first and second retaining means, at least 360 degrees relative to one another, about the longitudinal axis of the bar, whereby the bar becomes twisted with a varying pitch;
- and joining a follower with the bar to cooperate with the varying pitch of the twisted bar.
1 more element
Dependencies are inferred from the claim text.