US Patent: 1,540,388 - Portable saw


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US Patent: 1,540,388

Portable saw

Patentee:

John M. Crowe (exact or similar names) - Covington, KY

USPTO Classifications:

144/136.1, 83/477.2, 83/486.1, 83/490

Tool Categories:

handheld power tools : handheld circular saws

Assignees:

Crowe Mfg. Co. - Covington, KY

Manufacturer:

Skilsaw, Inc. - Chicago, IL

Crowe Mfg. Corp. - Covington, KY

Ingersoll-Rand Co. - Jersey City, NJ

Witnesses:

Unknown

Patent Dates:
Applied:	Apr. 19, 1923
Granted:	Jun. 02, 1925

Patent Pictures:

USPTO (New site tip)
Google Patents
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Vintage Machinery entry for Skil, Inc.
Vintage Machinery entry for Ingersoll-Rand Co.
Vintage Machinery entry for Crowe Mfg. Corp.

Description:

This patent date was seen on a pneumatically-powered circular saw from Ingersoll-Rand Co. This patent date was also seen on a circular saw from Skilsaw, Inc.; the other patent dates on the saw spanned 1914 to 1925, "other patents pending".

An article in the May 1927 "Railway Engineering and Maintenance", page 218, describes Ingersoll-Rand Co.'s "New Air-Driven Portable Hand-Saw". The saw "consists essentially of an Ingersoll-Rand three-cylinder type air motor, a circular saw blade and a Crowe safety saw guard, together with suitable hand grips..." The saw was intended for cutting wood, soapstone, bakelite, wall-board, cable and copper. A variety of blades were available. The speed of cutting was claimed to be 20 times as fast as by hand-power. It was available in sizes to accommodate blade diameters of 6, 8 and 12 inches.