Geometrical instruments – Area integrators – Electrical
Patent
1981-10-21
1984-02-07
Little, Willis
Geometrical instruments
Area integrators
Electrical
33172D, 33180R, G01B 525
Patent
active
044294638
ABSTRACT:
An electro-mechanical dynamic datum point locator tool is provided to determine x and y axes datum points on a workpiece. The locator tool is a cylinder for placement, for example, in an adjustable chuck in a mill head of a milling machine. A cylindrical tip assembly depends from the cylinder and is flexibly supported for eccentric to concentric rotation during contact with the edge of a workpiece which is held in place on the bed of the milling machine. During rotation of the locator tool, a light emitting diode emits light from the circumference of the cylinder whenever the initially eccentrically placed cylindrical tip touches the edge of the workpiece. As the edge of the workpiece is moved closer to being in line with the centerline of the mill head of the milling machine, the cylindrical tip is reactively moved progressively toward its concentric rotating position. During this return movement of this tip, the light emitting diode stays on longer and appears to the machinist as a progressively increasing arc of light. Soon its spot source of light is continuously turned on by virtue of the speed of rotation of the cylinder, the light appears to the machinist as a continuous ring or halo of light, indicating that the center line of the collet and the turning head of the milling machine is only away from the edge of the workpiece by a distance equal to one half of the diameter of the tip of the locator tool. The cylinder of the locator tool preferably has an electrical conductive outer tubular sleeve with an interior preformed non conductive plastic hollow sleeve made in two longitudinal halves. Within the plastic hollow sleeve is an assembly of various electro-mechanical components. An insulated collar having a small central opening is positioned at the bottom of the cylinder and is fitted with a light emitting diode at its circumference. A cylindrical tip assembly is inserted through this central opening and secured in place by a flexible tension spring. During rotational contact of the tip assembly with the edge of the workpiece, the light signal circuit is completed via the milling machine and back through the locator tool and its light emitting diode. In an alternative embodiment, this cylindrical tip assembly may be adapted with a surface contacting ball to determine datum points on the top of the workpiece with respect to the z axis.
REFERENCES:
patent: 1040715 (1912-10-01), Mann
patent: 1984864 (1934-12-01), Cole et al.
patent: 2109976 (1938-03-01), Pierce, Jr.
patent: 2451904 (1948-10-01), Beatty
patent: 2490483 (1949-12-01), Simer
patent: 3370356 (1968-02-01), Jend
patent: 3470618 (1969-10-01), Richer
patent: 3499226 (1970-03-01), Hopkins
patent: 3999299 (1976-12-01), Johnson
patent: 4043046 (1977-08-01), Thomas
Sales Publication: "New Tool Report", by Lam Tool Co., .COPYRGT.1981.
Little Willis
Mattern Jr. Roy E.
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