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US Patent: 1,389,565
Machine element
Patentee:
John Jensen - Rockford, IL

USPTO Classifications:
269/240, 74/424.75, 83/200, 83/601

Tool Categories:
metalworking machines : metal punches

Assignees:
Whitney Metal Tool Co. - Rockford, IL

Manufacturer:
Whitney Metal Tool Co. - Rockford, IL

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 04, 1918
Granted: Aug. 30, 1921

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Roper Whitney, Inc.
Description:
Improvements to patent 975,591, which is "a punch comprising a bushing, a spindle extending through the busing, the bushing and spindle being helically grooved, a series of balls in said grooves, and a cylindrical spacer or retainer for the balls, said retainer being interposed between the busing and the spindle and provided with holes for receiving the balls. The grooves in the bushing and the spindle are longer than the series of balls, so that the series of balls rotates and moves longitudinally as a body or unit. Among the many uses of punches and shears of the type shown in said Whitney patent is the shearing and punching of metal in connection with the erection of buildings. When employed in and upon buildings under construction, the tools receive extremely rough usage, and lubrication of the tools is very apt to be neglected. The retainer being necessarily formed of thin metal, it is subject to considerable wear under the most favorable conditions, the ball-receiving holes in the retainer becoming elongated as the wear and thus failing in their function of keeping the balls properly spaced apart."

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