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In its appearance, Ryther's chuck is similar to chuck patented much earlier by Parson (1900). One distinguishing element of this chuck is a lack of the locking screw on the side of the shell.
There are several variations of this chuck. Some of them have clear marking that reads: "Millers Falls Co., Millers Falls, Mass. Pat'd September 29, 1896", some others have no markings and their look is a bit different. Also, Millers Falls produced at least seven sizes of this chuck. From the study of catalogs it appears as chuck with markings is earlier then the one without. This would suggest that chucks without marking begun appearing after patent license expired. If this assumption is correct then estimated date of "no marking" chuck implementation would be c. 1903 or after. On the following pages I will show photographs of two variation and explore internals of these chucks. The chuck we will see here was one of the most often used on "small" hand drills produced by Millers Falls Co. I have seen them on No. 1, No. 2, No. 3, and No. 5 drills and their variations. The earliest implementation of this chuck I was able to find was on No. 1, No. 2, and No. 5 drills in Catalog "B" Pocket Edition - c.1903
This chuck was used approximately until 1925, when a new spring chuck found its way to production lines. I will explore this chuck in a separate section. For those who are interested, full patent document is also available.
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"Be it known that I, William H McCoy, of Miller's Falls,
in the County of Franklin and state of Massachusetts,
have invented a certain new and useful Improvement in
Chucks, of which the following, taken in connection with
a accompanying drawings, is a specification."
