04790294 is referenced by 267 patents and cites 9 patents.

A steering section for an endoscope or borescope employs a plurality of steering cables that pass through peripheral bores of axially aligned flat washers. Pairs of beads are strung on the cables between the washers to define hinge points for the bending of the steering section. Each pair of beads include a spherical-nose ball bead and a countersunk socket bead. A through-passage in the ball bead has a relatively narrow nose portion with a small clearance with respect to the steering cable, and a tapered or countersunk portion that expands basewards and prevents the spacer bead from binding the cable. The axial bores in the washers are tapered out fore and aft from a relatively narrow waist portion so that the cable touches the washer only at a single point. Limiter beads of about half the thickness of the spacing between washers limit the bending of the steering section.

Title
Ball-and-socket bead endoscope steering section
Application Number
7/78713
Publication Number
4790294
Application Date
July 28, 1987
Publication Date
December 13, 1988
Inventor
Richard Bingham
Auburn
NY, US
Jimmie B Allred III
Skaneateles
NY, US
Agent
Wall and Roehrig
Assignee
Welch Allyn
NY, US
IPC
A61B 1/00
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