Improvements in Drilling, Boring and similar Machines.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Drilling, Boring and similar Machines.
I, ANDREW BJERRE, of 39, Bell Street, Renfrew, in the County of Renfrew,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention which relates to drilling, boring and similar machines having
rotating tool-holding spindles, has for its object to provide simple and efficient
means for securing the tool holders within the sockets in the rotating spindles so
that they may be readily detachable, whilst obviating the danger and inconvenience
attendant on the use of the pinching screws commonly employed for that
purpose.
To that end I secure the tool carrying bar or tool holder within the socket provided
for it within the rotating spindle by means of a cap screwed on the socket end and
overlapping or engaging with a projecting wing or wings on the tool holder. This
cap has a central orifice which permits of the passage of the end of the tool holder
into the socket when the wings on the tool holder are brought into line with
corresponding notches cut out of the cap. When the tool holder is in place the cap
is turned slightly so that the notches are carried out of line with the wings
and the latter are covered by a solid part of the cap, which retains the end of
the tool holder within the spindle socket. The usual key seat and key are fitted to
secure the tool holder against turning within the socket.
By the arrangement described the tool holder is carried centrally in its socket and
is not liable to be thrown out of line as is the case when the usual pinching screw is
used and the risk of accident due to the rotation of the spindle with a projecting
pinching screw is avoided.
:
During and similar machines.
I, ANDREW BJERRE, late of 39, Bell Street, Renfrew, in the County of Renfrew,
and now of 25, Christians Volgade, Copenhagen, Denmark, Engineer, 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 which relates to drilling, boring and similar machines having

page_text: rotating tool-holding spindles, has for its object to provide simple and efficient means
for securing the tool holders within the sockets in the rotating spindles so that
they may be readily detachable, whilst obviating the danger and inconvenience
attendant on the use of the pinching screws commonly employed for that
purpose.
As illustrated by the accompanying drawings, Figure 1 of which is a part longi-
tudinal section of a tool holder, and Figure 2 an end view of the same, and Figure 3
a like view of the tool holder, I secure the tool carrying bar or tool holder A within
the socket B provided for it on the rotating spindle B₁ by means of a cap C screwed
on the socket end and overlapping or engaging with a projecting wing or wings A¹ 1
on the tool holder A. This cap C has a central orifice C₁ which permits of the
passage of the end of the tool holder A into the socket B when the wings A¹ on the
tool holder A are brought into line with corresponding notches cut out of
the cap C. When the tool holder A is in place the cap C is turned slightly so that
the notches C2 are carried out of line with the wings A¹ and the latter are covered
by a solid projecting part or parts of the cap C, which retains the end of the tool
holder A within the spindle socket B. The usual key seat A2 in the tool holder A
and key D in the socket B are fitted to secure the tool holder A against turning
within the socket B.
By the arrangement described the tool holder A is carried centrally in its socket B
and is not liable to be thrown out of line as is the case when the usual pinching screw
is used and the risk of accident due to the rotation of the spindle B¹ with a projecting
pinching screw is avoided.
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
In drilling, boring, and similar machines, the means for securing the tool holder
within the socket of the rotating spindle, consisting in conjunction with the usual
key and key seat in the socket and holder respectively of providing the holder with
wings adapted to pass into notches in a cap screwed upon the socket and having pro-
jeeting parts which, when turned slightly, engage the aforesaid wings, substantially
às described.
Dated this foth day of June 1639.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.
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