Improvements in Lathe and similar Chucks.
Year: 1892

page_text: Date of Application, 18th Nov., 1892-Accepted, 28th Jan., 1893
COMPLETE SPECIFICATION.
Improvements in Lathe and similar Chucks.
I, BRUNO WESSELMANN of 85/87 Mittelweg Borgfelde, Hamburg in the
Empire of Germany Manufacturer 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 the production of a chuck for holding drills and
the like in which the usual clamps or jaws for receiving and holding various sized
drills and cutters are entirely dispensed with and which is provided at the front
with a certain number of holes for receiving the shanks of different sizes and each
adapted to be adjusted and secured so that its axis coincides with that of the
chuck.
As all the parts of the new drill chuck are simple round bodies easily produced in
the lathe cheapness of manufacture is furthermore attained.
In the accompanying sheet of illustrative drawings:
Figure 1 is a front view of a chuck constructed according to this invention and
Figure 2 is a longitudinal section on the line - and Figure 3 a front view with
the cover plate P removed of the same.
บ
The main body A of the chuck is provided with a cylindrical recess arranged
eccentrically and in which is fitted a cylinder a with axial holes of different
diameters bored in a circle round its central point. The square hole in the centre
of the cylinder a serves to receive the head of a corresponding key by which the
rotation of the cylinder a is effected. The circular line through which the axes of
the boringspass also passes through the axis of the main part of the chuck on the
front side of which the cover plate P with a central opening o is fastened by means
of screws s. The diameter of the axial opening o corresponds to that of the largest
hole in the cylinder a.
In the axial line of the main part and at the base of the eccentric bored out
portion is a second cylindrical boring for the reception of a hollow piece k the front
of which forms a slightly cylindrical conical surface inside which fits a spiral
spring which presses the front surface of the hollow body against the cylinder a.
A screw bolt S in the main piece enables the cylinder to be fixed in any position by
means of holes drilled at right angles to the borings 63 in the cylinder in the outside
edge thereof right through to the holes b. The lower end of the screw bolt S
therefore also clamps the drill in the corresponding hole.
The object of the hollow piece K is to facilitate the setting in position of the
cylinder a for any required diameter of drill, and to make known by the feel when
any of the holes 6 in the cylinder are exactly in the axis of the main body behind
the opening O of the cover plate P. If the cylinder is turned by means of the
beforementioned key to the right or left from the position shown in Figure 2 the
piece K is pressed back by means of its front conical surface working against
the edges of the hole and the spring f is slightly compressed. As soon as the
next concentric hole lays behind the opening o a perceptible snap of the hollow
piece into the corresponding hole takes place and the movement of the cylinder is
somewhat retarded. The cover plate P can if necessary serve the purpose. A
small steel screw passing through a hole in the circumference of the main
body A and screwing into the cylinder serves to hold the cylinder fast in the main
body.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :-
1. A chuck for drills or the like in which a cylinder a is eccentrically mounted in
the main body A and is provided with axial borings of different diameters so
arranged that by the rotation of the cylinder the axis of each boring can be brought
to coincide with the axis of the main body and fixed the whole substantially as
described.
2. A chuck for drills or the like in which a cylinder a is eccentrically mounted in
the main body A and is provided with axial borings of different diameters so
arranged that by the rotation of the cylinder the axis of each boring can be brought
to coincide with the axis of the main body and fixed by means of a screw working
in the main body and passing through a radial hole in the cylinder into the axial
hole and provided with a means for indicating when the said axes coincide and for
accurately holding them in this position the whole substantially as described.
Dated this 18th day of November 1892.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.