Flexure-pivot assemblies and methods of making them

Details Flexure-pivot assemblies and methods of making them Flexure-pivot assemblies and methods of making them

1976-07-06

1978-10-31

Wyche, Benjamin W.

64 27B, 74 5F, G01C 1918, B23P 1100

Patent

active

041226895

ABSTRACT:
A flexure-pivot for providing resilient restraint that opposes relative angular displacement between two members involves two flat springs, that are held at one end between pairs of pins carried by one member and at the other end between pairs of pins carried by the other member, the flat springs each having two parallel rib portions that are linked at one end and are interlaced with one another. In one form of flexure-pivot the unlinked end of both the rib portions of each spring is secured between a pair of pins carried by one member and the linked end of both the rib portions of each spring is secured between a pair of pins carried by the other member. In another form of flexure-pivot the pairs of pins carried by one member are axially aligned with the pairs of pins carried by the other member, when there is no relative displacement between the members, and the unlinked end of one of the rib portions is secured to one of the pairs of pins carried by one member and the unlinked end of the other one of the rib portions is secured to the axially aligned pair of pins carried by the other member, so that there is a resilient interconnection between the axially aligned pairs of pins. In both forms of flexure-pivot, further pins are mounted with one or other of the members to limit relative angular displacement between the two members by engagement with pairs of pins mounted on an opposite member. Manufacture of both forms of flexure-pivot is initially the same and is carried out by inserting the ends of four pairs of pins in holes in one member, securing each end of the two flat springs between opposite pairs of pins, inserting the other ends of the four pairs of pins in holes in the other member, and brazing the assembly formed to secure the springs to the pins and the pins to the members. One form of flexure-pivot is subsequently formed by cutting two adjacent pairs of pins close to one member and the other two adjacent pairs of pins close to the other member. The other form of flexure-pivot however is formed by cutting through two adjacent pairs of pins at points between the rib portions and cutting through the other two adjacent pairs of pins at one point close to one member and at another point close to the other member.

REFERENCES:
patent: 1640670 (1927-08-01), Schaeffer
patent: 3073584 (1963-01-01), Troeger
patent: 3124342 (1964-03-01), Ormond
patent: 3124873 (1964-03-01), Troeger
patent: 3181851 (1965-05-01), Troeger
patent: 3252696 (1966-05-01), Friedel
patent: 3277555 (1966-10-01), Kutash
patent: 3360255 (1967-12-01), Ormond
patent: 3722296 (1973-03-01), Hurlburt
patent: 3825992 (1974-06-01), Troeger

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