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US Patent: 2,359,997
Knurling Tool
Andrew B. Lamoreaux - Elmira, NY

USPTO Classifications:
72/108, 72/703

Tool Categories:
metalworking machines : metal lathes : lathe tools

Bendix Aviation Corp. - South Bend, IN

Not known to have been produced

Burr W. Jones

Patent Dates:
Applied: Feb. 27, 1941
Granted: Oct. 10, 1944

Patent Pictures:
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Clinton S. Janes - patent attorney

The present invention relates to a tool for knurling cylindrical surfaces. Automatic lathes of the multi-spindle type are now very generally used for high-speed production of interchangeable parts. The operations of turning, boring, threading, reaming, chamfering, et cetera, are readily carried out on such machines, but it has heretofore been difficult to satisfactorily perform knurling operations on machines of this type due to the high pressures necessarily involved in this type of work. This is particularly true when the work is in the form of a shaft or spindle, since the pressure necessary to force the knurl into the work is liable to spring both the work and the tool holder unless elaborate and expensive fixtures are employed with attendant difficulty of installation in limited space. It is true that some knurling tools have been developed in which a support roll for the work is mounted in the tool opposite the knurling roll, and means such as a clamp bolt provided for squeezing the work between the knurling and support rolls. Such tools, however, are obviously not well adapted for use in a multi-spindle machine since they require separate means for actuating the clamping means after the tool has been applied to the work. It is an object of the present invention to provide a novel tool for knurling cylindrical surfaces, which is efficient and rapid in operation and simple in construction. It is a further object to provide such a device, which automatically furnishes a high mechanical advantage for the actuating mechanism. It is another object to provide such a device in which the mechanical advantage increases as the knurling operation proceeds. It is another object to provide such a device in which the depth of the knurling is automatically maintained constant irrespective of minor variations in travel of the actuating mechanism. It is another object to provide such a device, which incorporates a lateral support for the work immediately adjacent, the surface to be knurled. It is a further object to provide such a device in which the lateral support engages the work at a point directly opposite the knurling wheel when the maximum knurling pressure is being applied.

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