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Involute Bell Crank

IP.com Disclosure Number: IPCOM000043600D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Passehl, R: AUTHOR

Abstract

In many actuator systems, the linear actuating force has to be diverted for space reasons, for example, for accommodating the electromagnet 1 used as an actuator. If a bell crank 2, pivotable about a support pin 6 and having linear slotted holes 3 (Fig. 1), is used, the force F, with bell crank 2 being in an inclined position, is divided into two force components, namely, into a longitudinal force FL, active in the direction of the normal relative to the tangent at the circle of contact, and into a rectangular transversal force FT (Fig. 1B). The latter force is active transversely to the element 7 to be displaced, thus causing the latter to tilted. With the involute bell crank 4 according to Figs.

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Involute Bell Crank

In many actuator systems, the linear actuating force has to be diverted for space reasons, for example, for accommodating the electromagnet 1 used as an actuator. If a bell crank 2, pivotable about a support pin 6 and having linear slotted holes 3 (Fig. 1), is used, the force F, with bell crank 2 being in an inclined position, is divided into two force components, namely, into a longitudinal force FL, active in the direction of the normal relative to the tangent at the circle of contact, and into a rectangular transversal force FT (Fig. 1B). The latter force is active transversely to the element 7 to be displaced, thus causing the latter to tilted. With the involute bell crank 4 according to Figs. 2, 2A and 2B, the curved guide hole 5 ensures that the force applied is invariably linear if the edges of the guide hole 5 correspond to an involute function, as is used in gear tooth geometry for the rolling motion of tooth edges. As a result, the force F, active on bell crank 4 and element 7, is invariably equidirectional with the force FL .

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