Improvements in Dental Pluggers.
Year: 1887

page_text: COMPLETE DIBUITICATION.
Improvements in Dental Pluggers.
I, WILLIAM G. A. BOUWILL, of Philadelphia, in the county of Philadelphia, and
State of Pennsylvania, United States of America, Dentist, do hereby declare the
nature of my invention for "IMPROVEMENTS IN DENTAL PLUGGERS," and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
My invention relates more particularly to revolving-hammer mechanical dental
pluggers, by which the plugging-tool is hit a rapid series of blows to impact the gold
in the teeth.
The object of my invention is to improve the fitting of the parts and connections of
the revolving hammer to facilitate their construction and alteration to suit different
types of engines; also, to improve the hammer projection of said revolving hammer,
and also to improve the method of adjusting the blows delivered upon the tool.
The nature and objects of my invention will more fully appear from the following
description, and the subject-matter claimed by me will be particularly pointed out at
the close of this specification.
The accompanying drawings show my present improvements, and therein Figure 1
is a plan view of the instrument.

page_text: Figure 2, a longitudinal section therethrough.
Figure 3 is a view of the pivoted latch-arm at one side of the revolving hammer.
Figure 4, a section through the revolving hammer.
Figure 5, a section of the spindle and yoke by 'which the tool may be connected to
the dental engine.
Figure 6, a view of the sectional hand-piece casing, with the securing-nut between
said sections in section.
Figure 7, a view of the end wise-movable or reciprocating tool-carrying shaft,
spindle or rod detached and with a securing-nut at the tool-clamping end in section.
Figure 8 is a side view of the revolving-hammer, showing the improved method
of fitting it with an adjustable and reversible hammer projection; and
Figure 9 is a section through the instrument on the line Z Z of Figure 1, showing
more particularly the devices which regulate the blows delivered.
The spindle A is fitted with a yoke, A¹, to receive between its members the revolving
hammer B, fitted to turn or rotate on an axis-pin, C, on which said yoke may also
vibrate or rock to enable the instrument to be handled freely in operation. This axis-
pin C extends rigidly from one arm, d, of the rear casing section or frame, D, to
which the handle portion E of the hand-piece casing is attached. The opposite end
of said axis-pin is provided with a clamp-nut, c, and said end is supported by means
of a latch-arm, D1, swinging on a pivot, d', on said casing-frame and adapted to hook
over the nut end of said axis-pin and be clamped thereon by said nut, c, so as to
form the bearing for said axis-pin at that side of the instrument.
From the above it will be seen that the parts may be readily separated, so as to
admit of the removal and replacement of the revolving hammer. Removing the
clamp-nute permits the latch-arm D¹ to be swung away from the axis-pin C and the
yoke A and hammer B to be moved off endwise from said axis-pin.
The next feature of my invention relates to the particular construction of the striking
projection of the revolving hammer, which has heretofore been made in the shape of
a block or ball, the surface of which is enlarged as wear takes place. To prevent this
enlargement of the striking-surface, as well as to enable wear to be readily compensated
by adjusting the striking projection, I make said hamimer projection b in the form of
a thin plate inserted radially in a slot in the revolving hammer B and clamped therein
by a set-screw, . (See particularly Figure 8.)
This hammer projection may be adjusted more or less relatively to the periphery of
the hammer-wheel, and when one side is worn another edge can be turned out to act
as the striking part, and again be rigidly locked to the wheel by means of the clamp
screw b¹.
Another feature of my invention has relation to adjusting the strength of the blows
to be imparted to the plugging-tool, and this is determined by the greater or less
projection of the end of the tool-carrying spindle F beyond the end of its hand-
piece frame D, the hammer in its revolution, by its striking projection, hitting a rapid
series of blows upon the end of said spindle, which are communicated to the plugging-
tool carried at the opposite end thereof. Said tool-carrying spindle is fitted with a
shoulder, abutting against the front end of a male screw-sleeve, G, the threads of
which fit the screw-threads upon the interior of the hand-piece frame D. It will be
obvious that the extent to which this screw-threaded sleeve G is screwed forward in
said frame D determines the extent of projection of the rear end of the spindle
beyond said frame to receive the blows of the revolving hammer. In order to adjust
this sleeve with accuracy and nicety, I fit its rear end with pinion-teeth g. and fit
said frame D with a worm or screw, H, which gears with said pinion, and by the
rotation of which the sleeve is adjusted backward and forward. This adjusting worm
or screw H has a suitable end, h, by which it may be turned in effecting the adjust-
ment, and requires no locking device, as will be obvious. The construction of the
forward part of the hand-piece casing and of the tool-carrying spindle is well known,
and may be varied in a great many ways which form no part of my invention. The
tool-clamp at the front end of said spindle is of a well-known construction to fit the
instrument for a ready interchange of operating-tools.

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 I
claim is:
1. The combination of the hand-piece frame and its fixed axis-pin, the detachable
hammer and yoke, and the swinging arm and clamp-nut, substantially as described.
2. The revolving hammer fitted with a laterally-adjustable hammer projection.
3. The revolving hammer fitted with a reversible hammer projection and a locking
device to fix said projection in its reversed position, substantially as described.
4. The combination of the hand-piece frame, the tool-carrying spindle fitted to
reciprocate or move endwise therein, the screw-sleeve, and the adjusting screw or
worm geared therewith, substantially as described, whereby to regulate the strength
of the blows delivered upon the operating-tool.