An Improved Tool Holder for Lathes and the like.
Year: 1895

page_text: Date of Application, 12th July, 1895-Accepted, 17th Aug.,
1895
An Improved Tool Holder for Lathes and the like.
Al communication by CARL BAUER, of Pfulligen, Wurtemberg, in the Empire of
Germany, Mechanic.
I, GEORGE CECIL DYMOND M. Inst. M.E., of The Agency for Foreign'
Patent Solicitors 6 Lord Street, Liverpool and 6, Bank Street, Manchester.
both in the County of Lancaster, 118 New Street, Birmingham' in the County
of Warwick and 31 High Holborn in the County of Middlesex, Patent Agent,"
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 has for its object an improved tool holder for lathes and the like.
whereby it is possible to attain, in the production of large quantities of similar
articles, perfect equality in the size, and whereby the cutting tool, whether for
boring, turning or the like, may always be inserted in exactly the same position.
The improved tool holder can be employed in the working of all metals.
In consequence of its varied adjustability precise work such as turning hollows
or boring and the cutting of external or internal screw threads may be effected.
In the accompanying drawings,
Figure 1 is a side elevation; and
Figure 2 a plan partly in section of the improved tool holder;
Figure 3 is a side elevation showing the lever for tightening the holder in its
closed and open positions ;
"
Figure 4 is a section on the line PQ, Figure 1.
The holder consists of a bar a preferably of steel and square in section which is
fixed upon the lathe rest S in the usual manner. The end of the bar a projecting
over the rest and. turned towards the article to be operated upon is bored trans-
versely to receive a tool socket b. This socket b is formed with a projection 6' and
both socket and projection are bored at right angles to each other for the
reception of the cutting tool c. The cutting tool can consequently be fixed in one
of two positions at right angles to each other according as to whether it is inserted
in the bore of the socket 6 or in the bore of the projection b'. The end of the
socket is screw threaded and is fixed firmly in the bar a by means of a lever g.
A screw on the socket serves for tightening firmly the cutting tool. On the
bar a a holder d is also fixed provided with a screw i adapted to engage the
projection b¹.
This screw also gives to the socket before the tightening of the lever g an
exact defined position. By this adjustment the cutting tool c which can be fixed
at right angles as well as parallel to the work in the socket 6 ie inserted and held
fast with its cutting surface corresponding each time to the work to be operated
upon. In order to prevent the projection & yielding laterally in consequence of
the opposing resistance of the work under operation, a flat face e (Figure 4) is
formed on the side of the projection 61 facing the bar a which on being adjusted
fast presses against the bar a.
Great differences in height of the centres of the lathe in comparison with the rest
are compensated by adjustable screws s s' in the bar a, the heads of which screws
bear upon the rest. These screws serve also at the same time to bring and hold
fast the cutting tool in an exactly horizontal or inclined position.

page_text: If the screws s s project equally forward, then the bar a lies exactly horizontal,
if, however, one or the other screw is screwed in or out, then the bar a is fixed
correspondingly inclined. The tool holder always remains fixed in the rest when
the cutting tool is being changed, the screw i only is loosened, whereupon the tool
can easily be removed. For smaller cutting tools as well as borers it is preferable
to make use of insertion pieces which are provided with smaller borers and which
are firmly fixed in the socket b or projection 6' in a similar manner to the cutting
tools as aforesaid.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. An improved tool holder for lathes characterised by a socket and projec-
tion (bb) adapted to be adjusted and fixed in a bar (a) firmly supported in a rest,
said socket and projection being provided with right angled intersecting bores to
receive the cutting tool or borer adjustable and adapted to be fixed therein by
means of screws (2), whereby the tool can be adjusted and held in any desired
direction or position substantially as described.
2. In a tool holder such as described in Claim 1, the arrangement of a lever (9)
on the socket (6) for the purpose of firmly fixing said socket in its supporting
bar (a) substantially as described.
3. In a tool holder such as described, a screw (1) mounted in a holder (d) on
the supporting bar (a) and adapted to engage the socket projection (6¹) in order to
give an exactly defined position to the socket (6) substantially as described.
4. In a tool holder such as described, the arrangement of a flat face (e) on the
tool holding socket projection (6') adapted to engage the side of the supporting
bar a in order to guard against any lateral yielding of said projection substantially
as described.
5. A tool holder of the kind described, characterised by two adjustable
screws (ss) fixed on the underside of the supporting bar (a), whereby the latter
can be adjusted to and held fast in a horizontal or inclined position substantially as
described.
Dated this 11th day of July 1895
WM. P. THOMPSON & Co.,
Agents.