Improvements in Tool Holders.
Year: 1898

page_text: Improvements in Tool Holders.
We, FRANK ILLUSTER SHELLHAMMER, Gentleman, and SAMUEL CARRELL GARNER,
Gentleman, both of Jeanesville, in the County of Luzerne, and State of Pennsyl-
vania, United States of America, 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 tool holders, adapted for use in turning metal, the object
of the invention being to improve the construction of devices of this character,
whereby the tool may be more easily inserted in or removed from the holder, and
the latter will be less liable to become glutted with chips, or in the event it should
become glutted the removal of the tool will not be prevented thereby.
With this object in view, the invention consists of the several details of con-
struction and combination of parts as will be hereinafter fully described, and
particularly pointed out in the claims.
፡
In the drawing:-
Figure 1 is a perspective view of a tool holder made in accordance with our
invention.
Figure 2 is a transverse section through the head of the holder.
Figure 3 is a perspective view of the clamping bolt, detached.
Figure 4 is a similar view of the holder, the tool and clamping bolt being
removed.
Similar reference numerals indicate similar parts in the several figures.
1 indicates the shank of the holder, and 2 its bead. The head will be preferably
circular in form and projected at its upper side above the plane of the upper
face of the shank. A circular recess 3 is formed in the head and opens out on what,
for the sake of distinction, will be termed the front side of the holder. This recess
is concave at its inner end, and the opeuing 4 leads from its center out through the
rear side of the holder.
5 indicates an inclined, rectangular groove formed in the front side of the
holder and extending from the lower edge thereof to its front end, and this groove
intersects both walls of the recess 3 centrally of the latter. 6 indicates the tool,.
adapted to seat in the groove 5, and the groove will be of a depth somewhat less
than the thickness of the tool in order that the outer face of the tool will project
slightly beyond the front face of the holder, for a purpose to be hereinafter referred
to.
The clamping bolt has a circular head 7, preferably of the same diameter as that
of the circular portion of the head of the tool holder on its front side, and a cylin-
drical shank, indicated by 8. The shank is adapted to fit in the recess 3 and its
end is conoidal, as indicated at 9, to fit the concave inner end of said recess. The

page_text: shank has a threaded extension 10 to pass through the opening 4 and receive the
locking nut 11. A square shoulder is formed between the inner face of the head ĩ,
and the shank 8, and the latter is provided with a transverse rectangular onen-
ing 12 adapted to register with the groove 5, and through which the tool will pass.
One wall of this opening is in the same plane as the inner face of the head 7 and
forms a continuation thereof, and the tool will thus be engaged by the head the
full width of the latter.
In order to secure the tool in the holder the clamping bolt will be fitted in the
recess with its transverse opening in alignment with the groove 5, after which
the tool can be readily inserted endwise through the slot and said opening, when
by tightening up the locking nut 11 the tool be firmly secured in position. As
the tool projects slightly beyond the front face of the tool holder, it is obvious that
the inner face of the bolt head will not be able to engage with the front face of the
holder, and will therefore serve effectually to clamp the bolt in the groove, the
said head forming one clamping surface and the bottom of the groove the other.
The tool will fit sufficiently loose in the groove to slide freely therein, and it is
obvious that by slightly loosening the locking nut 11 the head of the bolt can be
moved sufficiently to release the tool, when it can be slid out of the
groove when-
ever it may be necessary to do so for the purpose of grinding or otherwise repairing
1t.
Preferably, the circular portion of the head of the holder will taper slightly
from its front to its rear side, as indicated at 13, and the advantage of this is that
the chips or shavings will be guided to pass off the rear side of the holder and
thus direct it away from the space between the head of the clamping bolt and the
head of the holder. In any event, the circular form of the cutting head will tend
to carry the chips or shavings upwardly and rearwardly and there will, therefore,
be much less liability of the holder becoming glutted. Should, however, any
chips or shavings be forced in between the clamping bolt and the holder, as soon
as the locking nut is loosened and the clamping bolt given a slight lateral move-
ment, such chips or shavings will free themselves and not retard the free movement
of the tool in its withdrawal from the holder.
It is to be understood that these tool holders will be made of various sizes to
adapt them for use with different sized tools, and it is also to be understood that
changes in the form, proportion and the minor details of construction may be
resorted to without departing from the spirit or sacrificing any of the advantages
of this invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is;-
1. A tool holder comprising a shank provided in one side with an open recess
and formed in one of its side faces with an obliquely-disposed tool-receiving groove,
intersecting both walls of said recess and shallower in depth than the thickness.
of the tool seated therein, a clamping bolt having its body portion registering in
the said recess and provided with a transverse opening for the tool, and means for
tightening said bolt against the outer exposed side of the tool, substantially as set
forth.
2. A tool holder comprising a shank provided in one side, and at one end, with
a circular open recess, and formed in one of its side faces with an obliquely-dis-
posed tool-receiving groove centrally intersecting said recess and shallower in
depth than the thickness of the tool seated therein, a clamping bolt registering in
said recess and provided with a head having a flat inner face and with a transverse
opening for the tool, one wall of said opening forming a continuation of the flat
inner face of the head, and means for tightening said bolt against the outer exposed
side of the tool, substantially as set forth.
3. A tool holder comprising a shank provided at one end with a circular head
tapering from the front to the rear face thereof, said shank also having formed

page_text: in one side a tool-receiving groove, and a clamping bolt engaging with the tool
and having its head disposed at one side and in the plane of the circular head of
the shank, substantially as set forth.
Dated this 19th day of November 1898.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicants.