Adjustable bolt circle layout apparatus

Details Adjustable bolt circle layout apparatus Adjustable bolt circle layout apparatus

1991-08-08

1992-06-16

Haroian, Harry N.

Geometrical instruments

Gauge

With point marker

B25H 700

Patent

active

051215560

ABSTRACT:
An apparatus includes a base plate, with a series of convex slots oriented in a clockwise array through the base plate, and a top plate including a clockwise array of concave slots, wherein the convex slots and concave slots are each of a predetermined number and each pair of overlying concave and convex slots includes a layout spool interconnecting the slots, wherein the spools are directed radially, interiorly, and outwardly of a central opening within the base plate and top plate. A graduated clamp ring mounted to the base plate is positioned exteriorly of the top plate, with a central knob mounted to the top plate to effect rotation of the top plate relative to the base plate.

REFERENCES:
patent: 575469 (1897-01-01), Fancher
patent: 589872 (1897-09-01), Stratton et al.

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