Dental Base Plates.
Year: 1886

page_text: :
Dental Base Plates.
°
We, ARTHUR Bedford, of High Street, Chippenham, in the County of Wilts,
Surgeon Dentist, and CHARLES FREDERICK MILLAR, of 2 Weston Villas, Chippen-
ham, aforesaid, Land 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:-
The improved hammer press which constitutes this invention is designed to
assist in imparting the required final shape to dental base plates. Hitherto, more
especially in connection with metallic base plates, the practice has been to impart
the final shape to the plates entirely by means of a hammer or mallet wielded by
hand; a practice under which accuracy of correspondence in shape with the
impression in the matrix is difficult to obtain.
The improved hammer press in which this invention consists is constructed as
follows: In a frame, the upper part of which is conveniently constituted a nut
for its reception, works a screw which is made hollow and receives a spindle,
preferably of steel, which fits loosely in the screw and is provided at its lower end
with a head or platen.
:
The screw is at its upper end provided with a shoulder or nut over which fits a
removable hand lever employed for working the screw up and down in the nut of
the frame. The spindle contained within the screw terminates at its upper end in
a button or knob between the underside of which and the upper face of the hand
lever nut of the screw is a spring by means of which the top of the platen of the
spindle is maintained in contact with the lower end of the screw. Upon the base
of the press is a block or table upon which is placed the die and matrix containing
between them the plate to which the final shape is to be imparted.
་
By means of the hand lever, or an equivalent device, the screw is worked down-
wards and carries with it the spindle, the platen or head of which is thus brought
down upon the die which is thereby firmly pressed down upon the matrix, and,
consequently, the dental base plate contained between the matrix and the die is
pressed into the required shape. In order to ensure retention by the plate of the
shape thus imparted to it, the button or knob is struck with a hammer whilst the
plate is still under pressure. The force of the blows is transmitted to the die
through the spindle and its head or platen.
The frame by which the screw and spindle are carried is preferably hinged or
pivotted to the block or table which receives the die and matrix, and, in case the
upper face of the die or the bottom of the matrix be not square, the frame may be
inclined so that the thrust of the screw and the blows from the hammer may still
be transmitted in the proper direct plane. A rack and pawl, or set screws, or any
other suitable device, may, if desired, be adopted for maintaining the frame in a
vertical or inclined position.

page_text: The press may be used as well for shaping vulcanite or other plastic dental base
plates as for shaping metallic plates.
Referring to the accompanying sheet of drawings, Fig. 1 represents a front view
of our improved hammer press for shaping dental base plates; Fig. 2 is an end
view.
In the frame A, as a nut, works the hollow screw B through which is passed the
spindle C fitting loosely therein and furnished at its lower end with a head or
platen D which may be screwed or otherwise attached to the spindle. The
screw B is provided towards its upper end with a nut or shoulder b, Fig. 2, over
which fits the removable hand lever E, Fig. 1, employed for working the screw up
and down in the frame A. At its upper end the spindle C terminates in a button
or knob c, against the under side of which bears one end of a spiral spring F, the
other end of which bears upon the top of the nut or shoulder b of the screw B.
This spring F serves to maintain contact between the top of the head or platen D
and the lower end of the screw B. Upon the base G of the press is the block or
table H upon which is shown placed a die I and matrix K. By means of the
hand lever E, or an equivalent device, the screw B is turned so as to carry down
the spindle C, the platen D of which is thus brought. to bear on the die which is
thereby firmly pressed down upon the matrix, and, consequently, the dental base
plate contained between the matrix and the die is pressed into the required shape.
In order to assist in this and to ensure retention by the plate of the shape thus
imparted to it, the button or knob c of the spindle C receives a succession of blows
from a hammer whilst the plate is still under pressure. The force of the blows
received upon the button or knob c is transmitted by the spindle C to the die and
the plate contained between it and the matrix.
The frame A is preferably hinged at m to the block or table H and is capable
of pivotting or its hinge to be accommodated to any inclination in the upper face of
a die or bottom of a matrix, and thus enable transmission to the die of the thrust
of the screw B and the blows received on the knob of the spindle C in the proper
direct plane. A rack and pawl, or set screws, or any other suitable device, may,
if desired, be adopted for maintaining the frame in a vertical or inclined position.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
t
1. An improved hammer press for use in shaping dental base plates, consisting
of a frame such as A, preferably hinged or pivotted in place, a hollow screw such
as B working in the said frame as a nut, a spindle such as O contained within the
said hollow screw and raised and lowered therewith and furnished with a head
or platen such as D for bearing upon the die of a metallic dental base plate or
upon the upper part of the flask of a vulcanite or other plastic plate and for
transmitting to such plates the pressure exerted by the action of the screw afore-
said and the force of blows received on the button or knob of the spindle aforesaid,
and a spring F, or the equivalent thereof, for drawing up the platen of the
spindle against the lower end of the screw B, substantially as hereinbefore
described and shown in the accompanying sheet of drawings.
2. The combination of parts constituting the hammer press for assisting in
shaping dental base plates, constructed, arranged and operating, substantially as
shewn and described.