Improved Universal Face Plate or Chuck for Lathes or Milling Machines.
Year: 1886

page_text: Date of Application, 30th Apr., 1886.
Complete Left, 17th Dec., 1886.
Complete Accepted, 30th May, 1887.
PROVISIONAL SPECIFICATION.
Improved Universal Face Plate or Chuck for Lathes or Milling
Machines.
I EDMOND PIERRE BAVILLE of Brussels in the kingdom of Belgium Builder do
hereby declare the nature of this invention to be as follows:-
The universal face plate which forms the object of the present invention, is provided
with slots and dogs as in all ordinary plates; but it differs from the plates at present
known in the new means for chucking which I employ and hereafter describe. This
arrangement of concentrical chucking consists in a toothed crown occupying the
central part of the plate and engaging three pinioned screws supported by one piece,
arranged radially and forming with each other equal angles. One of the extremities
of these screws gears into the exterior crown of the plate, whilst they are maintained
on the other side by a supporting stop preventing them from moving longitudinally
and placed against the pinions exteriorly to the crown.
On each of the screws just mentioned is arranged a threaded sleeve rigidly fixed to
a sliding dog which moves in two dovetailed grooves. It results from this arrange-
ment that when the toothed crown is turned the screws will also be turned thus
causing the three sliding dogs to advance or recede equal distances. It also results
herefrom that any piece of an appropriate and regular form, placed between the
three dogs, will be naturally and exactly centred the moment it is seized by the
three dogs.
A pressure screw supports a ring which maintains in place the toothed crown.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
& 323, High Holborn, W.C.,
Patent Agents for the Applicant.

page_text: 1, EDMOND PIERRE BAVILLE of Brussels, in the Kingdom of Belgium, Builder,
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:
The universal face plate which forms the object of the present invention, is provided
with slots and dogs as in all ordinary plates, but it differs from the plates at present
known in the new means for chucking, which I employ, and hereafter describe. This
arrangement of concentrical chucking consists in a toothed crown occupying the
central part of the plate, and engaging three pinioned screws supported by one piece,
arranged radially, and forming with each other equal angles. One of the extremities
of these screws gears into the exterior crown of the plate, whilst they are maintained
on the other side by a supporting stop preventing them from moving longitudinally,
and placed against the pinions exteriorly to the crown.
The invention is best described by aid of the accompanying drawings made in
accordance with my invention in which
Figure 1 is a section on the line A. B.
Figure 2 is a plan.
In these A is the face plate provided with slots and dogs as in all ordinary plates.
It is provided with a toothed ring or crown A' occupying the central part of the plate
and meshing with the three pinioned screws A", A, A. Each of these screws
are supported and prevented from moving longitudinally by supporting plates or
stops B, B, B, which are placed against the pinions on the outside of the ring or
crown A'.
111
On each of the screws A", A", A is placed a threaded sleeve rigidly fixed to
the sliding dogs C, C, C, which moves in dovetailed grooves. It results from this
arrangement that when the toothed crown is turned the screws will also be turned,
thus causing the three sliding dogs to advance or recede equal distances. It also
results herefrom that any piece of an appropriate and regular form, placed between
the three dogs will be naturally and exactly centered the moment it is seized by the
three dogs.
The ends of the screws A, A1, AI, are provided with square ends so that any
one of them can be turned by a box spanner, thus causing by means of the toothed
crown all the dogs to move simultaneously, and equal distances. A pressure ring G

page_text: maintains in place the toothed crown and is held in position by a screw C¹. The
dogs C, C, C are shown with movable jaws F, F1 F1 held in place by a projection
on its under surface, and the screws D, D. Their position can be altered so as to
grip a ring cylinder etcetera by unscrewing the screws D, D, and moving the jaws so
that their projections fit the hole E of the dogs. The same screws can then be used
for holding the jaws in place. If desired the jaws may be removed altogether.
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 :-
The combination of parts forming the improved universal face plate applicable to
lathes and to milling machines, substantially as and for the purposes described.
Dated this 6th day of December 1886
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
& 323, High Holborn, London,
Patent Agents for the Applicant.