Shaping, Turning, and similar Operations.
Year: 1886

page_text: Date of Application, 29th Sept., 1886.
Complete Left, 29th June, 1887.
Complete Accepted, 19th Aug., 1887,
Shaping, Turning, and similar Operations.
I CHARLES BOWERS of 283 Edge Lane Droylsden near Manchester in the County
of Lancaster Mechanic do hereby declare the nature of this invention to be as
follows:-
This invention relates to the means for securing the head or cutting or working
part of the tool to the shank by means of which it is fixed in the machine (or in
the handle in the case of a hand tool).
Hitherto the head or working part of the tool has been made in one piece with the
shank and when the latter became worn out or broken the shank became useless also,
and the whole tool had to be renewed.
According to my invention I propose to make the head or working part of the tool
and the shank in two separate pieces and connect them together as hereinafter
described so that when the head or working part of the tool becomes worn or broken
it can be removed and replaced by another without renewing the shank also.
For this purpose I cut or form a screw thread on the end of the shank on which I
fit a screwed nut or head. Across the face of this nut I cut or form a groove which
is undercut or dovetailed and I make the working part of the tool with a T-shaped
or V-shaped projection at the back fitting into the undercut groove in the nut so that
it can be attached to the nut by sliding it into the groove sideways.
On screwing the nut (with the tool head in the groove) onto the end of the shank
the latter is forced against the projection of the tool head and holds the same firmly
in its place.
It will be evident that the tool head may thus be adjusted on the shank either
centrally or otherwise as may be required.
If the tool is intended to be always central I cut or form a notch in the back
thereof into which the end of the shank enters and thus holds the head perfectly
central.
Dated this 28th day of September 1886.
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.

page_text: Shaping, Turning, and similar Operations.
I CHARLES BOWERS of 283 Edge Lane Droylsden near Manchester in the County
of Lancaster Mechanic 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 :-
This invention relates to the means for securing the head or cutting or working
part of the tool to the shank by means of which it is fixed in the machine (or in the
handle in the case of a hand tool).
Hitherto the head or working part of the tool has been usually made in one piece
with the shank, and when the former became worn out or broken the shank became
useless also and the whole tool had to be renewed.
According to my invention I propose to make the head or working part of the tool
and the shank in two separate pieces and connect them together as hereinafter
described so that when the head or working part of the tool becomes worn or broken
it can be renewed and replaced by another without renewing the shank also.
The manner in which my said invention is to performed or carried into practical
effect will be readily understood on reference to the illustrative drawings annexed
hereunto and the following explanation thereof.
The drawing shows the application of my invention to a twist drill for the sake
of illustration, but it will be evident to any competent mechanic that the invention is
equally applicable to other forms and descriptions of tools.
Fig. 1. on the drawing is an elevetion of the tool and holder complete.
Fig. 2. is a similar view turned one quarter round and shown partly in section.
Fig. 3. is an elevation of the shank detached and Figs. 4 and 5 are section and
face views of the screwed nut or head hereinafter mentioned.
Upon or near the end of the shank a, a (Fig. 3) I cut or form a screw thread b, b
on which I fit a screwed nut or head c, c. Across the face of this nut c, c I cut
or form a grooved, d (see Figs. 4 and 5) which is undercut as shown at Fig. 4 or it
may be dovetailed, and I make the working part of the tool e with a T-shaped
projection ff at the back end (or it may be dovetailed) and fitting into the undercut
groove d, d in the nut c, c so that it can be attached to the nut by sliding it into the
groove d, d sideways.
On screwing the nut c, c (with the tool head fif in the groove d, d) on to the
screwed end b, b of the shank the end of the latter is forced against the projection f, f
of the tool head and holds the same firmly in its place. It will be evident that the
tool e, e may thus be adjusted on the shank a, a either centrally or otherwise as may
be required.
If the tool is intended to be always central I cut or form a notch or recess in the
back end thereof into which a corresponding pin or projection 9, 9 on the end of the

page_text: shank enters and thus holds the head perfectly central, or if preferred the notch
or recess may be made in the end of the shank and the pin or projection on the back
end of the tool.
I may also remark that although I have shown the nut c, c with a projecting
milled rim so as to be turned by hand, it may also be made flat sided or polygonal
so as to be turned by means of a key if preferred.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
The improved tool holder substantially as hereinbefore described and illustrated by
the drawings annexed; consisting in the combination of a T or V headed tool,
a screwed nut having a similar groove across the face, and a shank with a corre-
sponding screwed thread so that the head of the tool being inserted endwise in the
groove and the nut screwed on to the shank the tool and the shank will be firmly
united, and can at any time be detached by unscrewing the nut.
1005
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.