Improvements in Chucks or Holders for Tools and the like.
Year: 1891

page_text: Date of Application, 11th Aug., 1891
Complete Specification Left 11th May 1892-Accepted 11th June
1892
PROVISIONAL SPECIFICATION.
Improvements in Chucks or Holders for Tools and the like.
A communication from ANTOINE FLEURANT, of Macon, in the Republic of
France, Mechanical Engineer.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention to be as follows:-
This invention relates to that class of tool holders or chucks for use in hand
braces, drilling machines and so forth, the object of which is to securely and
centrally hold the tool or other object in the holder. The invention embraces a
tube cylindrical externally and tapered or cylindrical internally; this tube may be
either the end of the spindle of the drill or other machine or a portion of the stock
of a brace or it may be a separate article adapted to be secured to the said stock or
spindle in any convenient manner. This tube is provided with two or more spring
catches or equivalent adapted to be projected to the inside of the tube and to grip
the tool or other article. Outside the tube is a sleeve or cover which can be
turned round thereon and either merely placed on or secured so that it cannot be
freely removed and provided preferably with a milled edge and internal eccentric
or spiral ribs or projections so arranged that when the sleeve is revolved upon the
tube it will cause the spring catches to project internally and grip the article as
will be well understood.
1001
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Chucks or Holders for Tools and the like.
A communication from ANTOINE FLEURANT, of Maçon, in the Republic of
France, Mechanical Engineer.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex
Member of the Institution of Mechanical Engineers, 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 that class of tool holders or chucks for use with hand
braces, drilling machines and so forth, the object of which is to securely and
centrally hold the tool or other object in the holder.
The invention will be best understood by reference to the accompanying drawings
in which
Fig. 1 is an elevation of the complete holder or chuck of which Fig. 1ª is an end
view.
Fig. 2 is a longitudinal section of the sleeve of which Fig. 2 is a cross section
on the lines o-p of Fig. 2.
Fig. 3 is an elevation of the internal tube with the sleeve removed, Fig. 4 being
a similar view of the same part but taken on a plan in end view at right angles
thereto.
Fig. 5 is a back end view of the inner tube and
Fig. 6 is a cross section of the sleeve D upon the line -y of Fig. 2, looking
towards the back of the sleeve.
Like letters represent like parts throughout the drawings.

page_text: A represents an external cylindrical tube the interior of which may be cylindrical
or tapered and round or square as preferred; this tube may be either the end of
the spindle of the drill or other machine or a portion of the stock of a brace or it
may be a separate article adapted to be secured to the said stock or spindle in any
convenient manner. D is the sleeve having a preferably milled edge D' by which
it may be rotated upon the tube A, and with which it is either permanently
connected while free to rotate, or it may be merely slipped on as preferred. The
sleeve D is provided with internal eccentric or spiral ribs or projections E as
shown in Figs. 2 and 24, and recesses D2 at its back end to allow of the passage of
the spring catches B next described. The tube A carries two or more spring
catches B having heads C adapted to project into the interior of the tube A which
is for that purpose provided with slots or openings A'; the catches B may be
secured to the tube A at their fixed ends by screws B¹.
In operation the tool or equivalent to be held in the chuck is placed into the
central opening in A and the sleeve D revolved so that the wider parts of the
spirals E press upon the back of the catch heads C causing them to project into
the interior of the tube A and thus grip the article to be held therein. In Fig. 1
the heads Care shown projected into the interior of the tube A while in Fig. 4
they are shown retracted by the power of their own springs B.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is,—
1. In a chuck or holder for tools or the like the combination of a tube cylindrical
externally spring catches adapted to project into the interior of the tube and a
sleeve adapted to rotate upon the tube and provided with eccentric or spiral ribs
or projections substantially as and for the purpose specified.
2. In a chuck or holder for tools or the like the combination with the tube A
and spring catches B C of the rotatable sleeve D substantially as and for the
purpose specified.
Dated this 11th day of May 1892.
ALFRED J. BOULT,
Chartered Patent Agent.