IMPROVE- MENTS IN TAPS DIES REAMERS AND CUTTERS
Year: 1887

page_text: Date of Application, 10th June, 1887
Complete Left, 10th Mar., 1888
Complete Accepted, 18th May, 1888
JOHN RUSCOE of Albion Works Henry Street, Hyde, in the County of Chester,
Engineer and Machinist do hereby declare the nature of my invention for IMPROVE-
MENTS IN TAPS DIES REAMERS AND CUTTERS to be as follows:-
My Invention consists in cutting Straight Grooves inclined to the axis in Steel or
other Taps, and Dies, and Reamers, and Cutters, so as to secure the gradual cuiting
of each individual thread until the full length of the tap has passed through the hole,
the acuteness of the incline is in proportion to the length of the Taps, Dies, Reamers,
and Cutters, this being done so as not to interfere with the width of the Cutting
threads, and to enable the front cutting edge to clear the back edge of same, by which
means the taps, Dies, Reamers, and Cutters, can be recut when required.
I thus secure Taps, Dies, Reamers, and Cutters, which being gradually brought on
to their work, and with proper inclined straight grooves are more free from friction,
and much easier to work, and the cutting edges less liable to be damaged or snipped.
In the case of Reamers in particular the straight inclined grooves act as a kind of
skew cut which has a tendency to draw it into the hole upon which it is operating, the
straight inclined grooves giving it a keenness which cannot be got by ordinary
straight vertical grooves.

page_text: COMPLETE SPECIFICATION.
Improvements in Taps, Dies, Reamers, and Cutters.
I, JOHN RUSCOE of Albion Works Henry Street Hyde in the County of Chester
Engineer and Machinist do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
My Invention consists in cutting straight grooves inclined to the axis in Steel or
other taps, and dies, and Reamers, and Cutters, so as to secure the gradual cutting of
each individual thread until the full length of the tap has passed through the hole, the
acuteness of the incline is in proportion to the length of the Taps, Dies, Reamers,
and Cutters, this being done so as not to interfere with the width of the Cutting
threads, and to enable the front cutting edge to clear the back edge of same, by which
means the Taps, Dies, Reamers, and Cutters can be recut when required.
I thus secure Taps, Dies, Reamers, and Cutters which being gradually brought on
to their work, and with proper inclined straight grooves are more free from friction
and much easier to work, and the cutting edges less liable to be damaged or snipped.
In the case of Reamers in particular the straight inclined grooves act as a kind of
skew cut, which has a tendency to draw it into the hole upon which it is operating,
the straight inclined grooves giving it a keenness which cannot be got by ordinary
straight vertical grooves.
And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying drawing reference being had to the figures
and letters marked thereon see Sheets Nos. 1 & 2 and Figures Nos. 1. 2. 3 & 4.
Fig. No. 1 & 2 are plans and elevations of Tap with straight grooves A inclined to
the axis of the Tap.
Fig. 3 is plan and elevation of Reamer with straight grooves A inclined to the axis
of same.
Fig. 4 is plan and elevation of Die with straight grooves A inclined to the axis.
Having stated the nature of my invention and described the manner of performing
the same I would have it to be understood that I do not limit myself to the details
given, as they may be varied or modified, and I declare that I claim
1st. The said straight grooves A inclined to the axis of the Taps, Dies, Reamers,
and Cutters, as on Figs. 1. 2. 3 & 4 on accompanying drawings.
Dated the Ninth day of March, and amended with drawings April Twenty fifth,
One thousand eight hundred and eighty eight.
TAUN DISCON