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US Patent: 2,009,726
Change Gear Attachment for Machines
Constant Bouillon - Torrington, CT

USPTO Classifications:

Tool Categories:
metalworking machines : metal lathes : metal lathe accessories

Hendey Machine Co. - Torrington, CT

Not known to have been produced

none listed

Patent Dates:
Applied: Jul. 23, 1931
Granted: Jul. 30, 1935

Patent Pictures:
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Hendey Machine Co. History
"Vintage Machinery" entry for Hendey Machine Co.
Ernest R. Llewellyn - patent attorney


This invention relates to lathes and machines of like character and more particularly to feed mechanisms for moving the carriage and tool support in direct relation to the speed of the work spindle of the machine. In the conventional design of lathes it is the common practice to provide change-gear mechanism actuated directly from the spindle to give a direct ratio of longitudinal feed between the carriage that supports the cutting tool, and the head-stock spindle that revolves the work to be operated upon. This direct ratio is an important factor where the lathe is utilized in a thread cutting Operation and the threads cut a desired lead and within certain limits. To accomplish this result the lathe is provided with a head-stock having the usual spindle rotatably mounted therein. Various combinations of change gears are used in effecting a desired basic ratio of drive from the spindle to the quick change-gear box that directly or indirectly rotates the lead screw and which is effective in longitudinally moving the carriage and apron along the bed at the desired rate of speed, according to the combination of gears selected, to produce the desired longitudinal feed of the tool relative to the work. Speeds and feeds utilized in the operation of thread cutting are of a relatively low ratio with the cutting tool point of desired shape to properly form the side angles and root of the thread. In the arrangement of the above change-gear mechanism it is general practice to provide the head-stock spindle with a driving pinion which may be engaged or disengaged by an intermediate sliding gear which operates the interchangeable gears cooperating with the compound gear box. This compound gearbox comprises a cone of varying ratio quick change gearing which operates the main quick-change gearbox containing a cone of selective gears which operate the lead screw. With this arrangement of gearing various combinations may be quickly selected to effect a given ratio of speed between the spindle and lead screw which actuates the carriage. It is often desirable to use the above-mentioned thread cutting lathe in turning operations which presents attendant difficulties as it has been found more practical in turning operations to use an exceedingly greater spindle speed to revolve the work than is desirable or practical in thread cutting operations. While the thread cutting operation requires that a direct ratio be maintained between the spindle and longitudinal feed, turning operations, to produce a desired finish are usually accomplished with an exceedingly slow feed and high spindle speed and this ratio of feed is impractical to obtain through the regular arrangement of gearing from the desired high rate of spindle speed as this would require too great a reduction through the interchangeable gears which are required for thread cutting operations. Accordingly, the object of my present invention is to provide an auxiliary feed mechanism so organized and adapted that it may be inter-positioned with the regular gearing for conversion from the regular ratio of speeds and feeds of a thread cutting lathe to the most desirable ratio of speeds and feeds for turning operations. Another object of my invention is the organization of parts in a unit adaptable to be conveniently attached to the present design of engine lathe now in use and equipped for thread cutting operations and whereby the lathe may be converted into a high speed turning lathe.

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