Utility machinery and associated control arrangements
View Patent ↗A method is provided for bearing a pitch or grip of a belt running between a pair of opposing faces of respective first and second sheave members of a power transmission device. The method includes moving the second sheave member axially in relation to the first sheave member by translating to the second sheave member, in a form of linear movement, rotation of a control rod disposed substantially at right angles to a line of axial spoke of the second sheave member.
1. A method of varying the pitch or grip of a belt running between a pair of opposing faces of respective first and second sheaves of a power transmission device, the method including:
interconnecting the second sheave to an annular thrust member, the thrust member axially sliable along a shaft for moving the second sheave;
providing a boss on a control rod rotatable about an axis generally perpendicular to shaft, the boss travelling axially along the control rod in response to rotation of the control rod;
pivotably connecting a first end of a link to the thrust member and a second end of the link to the boss;
wherein rotation of the control rod causes linear movement of the second sheave axially in relation to said first sheave.
2. The method of claim 1 further comprising the additional steps of connecting a first end of a swinging arm to the link and fixing a second end of the swinging arm to shaft.
3. The method of claim 2 wherein the step of fixing the second end of the swinging arm to shaft includes the additional steps of fixing a fulcrum to the shaft and pivotably connecting the second end of the swinging arm to the fulcrum.
4. The method of claim 3 comprising the additional step of axially aligning the fulcrum with the control rod.
5. The method of claim 1 comprising the additional step constraining the path of the link to a predetermined curvilinear path.