Year: 1887

page_text: Date of Application, 4th Aug., 1887
Complete Left, 4th May, 1888
Complete Accepted, 8th June, 1888
I, WILLIAM PHILLIPS THOMPSON F.C.S. M.I.M.E. of the Agency for Foreign Patent
Solicitors 6, Lord Street, Liverpool and 6, Bank Street, Manchester both in the County
of Lancaster and 323 High Holborn, in the County of Middlesex, Civil Engineer, do
hereby declare the nature of this invention to be as follows:-
The improved dental-engine is constructed of the same metals usually employed
in the construction of that class of machinery. The crane-arm is provided with an
extension-arm for the purpose of extending and contracting the range of operation of
the dental engine. The crane-arm is supported by a bracket which may be hinged to
a banger fixed in any suitable manner. The crane-arm is preferably made hollow and
the extension-arm slides into it. The extension-arm is provided with a longitudinal
slot which slides along the shank of the end of a set screw or button provided in the
crane-arm. When at the point where the required extension is reached, it is set fast
by the set screw. The drill cable revolves in a suitable head block by means of a
bevel pinion. This bevel pinion can be made to gear with either a bevel wheel placed
beneath it or one placed above it. These wheels revolve on a spindle which can be
raised and lowered by an adjusting screw, so that either wheel can be brought into
gear with the pinion. The spindle is made hollow at its lower end and screwed with a
female thread. Into this the adjusting screw is fitted. The spindle is held in a sleeve,
the said sleeve passes down through the end of the crane-arm extension, and is secured
by a pin or key. The lower end of the spindle is made large enough to form the
female-screw to receive the adjusting screw. The adjusting screw is passed down
through the sleeve until its shoulder rests upon the bottom of the said sleeve and the
shank passes a thumb-piece which is provided for adjustment of the screw.
The screw
can therefore be turned so as to move the spindle until the required point is reached.
The spindle is provided with a pin sliding in a slot or groove in the sleeve so that while
preventing said spindle from revolving it does not prevent it being moved by the

page_text: adjusting screw. The lower bevel wheel which is provided with a driving pulley,
revolves on cone bearings fixed on the spindle. The upper bevel wheel is provided
with movable cone bearings, so that both the wheels are easily removable. The teeth of
the driving bevel wheels or of all the wheels may be made of rubber or other like
substance, if desired. The driving cord may pass over training pulleys revolving
preferably on conical bearings, one or more of which may be made adjustable, if
desired.
In order that the cable may be tipped down when not in use, its end is fitted to
jaws fixed conveniently under the bevel pinion. These jaws are provided with a screw,
so arranged as to tighten them and clip the cable rod so as to hold the bevel pinion in
gear with the wheels when the machine is in use, but to open out when the screw is
loosened, sufficiently to allow the cable to tip down upon its sleeve journal.
The following is the operation of the improved dental-engine. The length of the
crane-arm is regulated as required by means of the slot in the extension arm, the set-
screw and button and the adjustment of the extension-arm. It will be seen that the
extension arm is moved out or in the slot passing the shank of the button until the arm
is sufficiently extended or shortened. The set screw is then set fast. The bevel pinion
is then placed in gear with the driving bevel wheel. If the gear be too loose, then the
adjusting-screw is operated by the thumb-piece raising the said driving wheel against
the pinion as may be required to ensure the required traction.
A cord gives motion to the bevel driving wheel by means of the pulley attached
thereto, and consequently revolves the pinion. When the pinion is required to revolve
in an opposite direction, the screw is again operated to withdraw the spindle and bring
the upper wheel in contact with the upper side of the pinion, thereby revolving the
same in an opposite direction from that given by the contact with the lower
wheel.
When the machine is not required to be operated, the cable is tipped down to a
vertical position by loosening the jaws which open sufficiently to allow the same to
revolve freely upon the sleeve journal, until the drill-cable reaches the vertical position
as required.
it
Instead of the adjusting screw being placed under the bevel wheels as before described,
may be attached under the jaw, provided for tipping down the cable for the purpose
of raising and lowering the pinion, so that the pinion may be brought into gear with
either the lower wheel or the upper wheel, reversing the motion, as is well understood.
When this arrangement is adopted the spindle carrying the bevel wheels is held in a
portion of the extension arm formed to receive it; it can be fixed or made to revolve
with the said wheel as desired.
Dated this Third day of d 1007
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Agents for the Applicant.

page_text: I, WILLIAM PHILLIPS THOMPSON F.C.S. M.I.M.E. of the Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool, and 6 Bank Street, Manchester, both
in the County of Lancaster, and 323 High Holborn, in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention and in what manner
the same is to he performed, to be particularly described and ascertained in and by
the following statement :-
The invention relates to improvements in dental engines, which will be understood
by reference to the accompanying drawing, and the letters referring thereto.
Figure 1, is a side view, partly in section, of the front portion of the apparatus.
Figure 2. Section through axis of pulleys shown in Figure 1.
Figure 3. Similar view to Figure 1 showing modification of apparatus.
Figure 4. An under plan view of the tip down and bracket lever.
Figure 5. A sectional view of the same:
Figure 6. A front elevation of the entire apparatus
Figure 7. A plan view of the same.
Figure 8. A sectional view of back part of apparatus enlarged.
Figure 9. A sectional view of the training pulleys, same scale as Figure 8.
A represents the crane arm; B the extension arm C the bracket, which supports
the crane-arm;
D the hanger to which the bracket crane is hinged. D¹ the pulley
journal for the training pulleys; E the training pulleys; R³ the conical bearings
formed upon the shaft or journal rod D. R2 the adjustable cone journals, which are
set upon the shaft D₁ by means of the screw S2. The same device is referred to by
the same letters, where it is employed in the different applications and Figures.
F represents the driving cord, which drives the pulley G; G the driving pulley
attached to the wheel H. H the lower beveled driving wheel; I the upper beveled
driving wheel; the spindles upon which the gear H and I revolve; K the beveled
pinion, which gears with the wheels H and 1 for the purpose of revolving the drill
cable; L the head block for the drill cable to revolve in; M the tip down set-jaws or
clamps, N the tip down bracket lever; O the set screw for the tip down clamp.
Z the female screw sleeve for the tip down clamp; P the sleeve for the adjustable
combined post and spindle J and J' to operate in.
Qrepresents the lock pin or key for locking the sleeve P fast. R represents the
fixed cone bearings on the spindle J and J. R' represents the inovable cone-bearing
on the spindle J. S represents the adjusting screw for raising and lowering the
spindle J and J. T represents the guide slot for the pin U. represents the pin
attached to the spindle J and J to operate in the slot T and prevent the spindle J

page_text: and J from turning in the sleeve P horizontally. V represents the thumb-piece for
turning the screw S. W represents the guide slot, for allowing the extension arm B
to be moved out and in.
%
X represents the set screw for setting the extension arm fast by means of the
button Y. In Figures 4 and 5, Z represents the sleeve which serves as a journal for
the tip down, and a screw for clamping the set jaws M to loosen and allow the cable
rod to be tipped down to a vertical position, and when tipped up to a horizontal
position, to set the same fast by turning the thumb-piece O, which is attached to
the same.
Y₁ represents the shank of the set button Y to operate in the guide slot W.
E represents the rubber facing for the bevel gear.
The following is the construction of the improved dental engine. It is constructed
of the same metals usually employed in the construction of that class of machinery,
and the beveled gear faced with india rubber by applying about in the form shown in
Figure 2. The extension arm B is connected by sliding it into the crane arm A.
The slot W slides along upon the shank of the button Y, and when at the point
where the required extension is reached, it is set fast by the set screw X. The
sleeve P is formed so as to pass down through the crane arm extension B, and it is
secured by means of the più or key Q. The lower end is constructed large enough
to form the female screw to receive the screw S. The screw S is passed down
through the sleeve P until its shoulder rests upon the bottom of the said sleeve, and
the shank passes the thumb piece V, which is firmly attached to the same. The
screw S is then turned, and the spindle J and J¹ drawn until the required point is
reached.
The clamping jaws M are formed with sufficient spring to open out from the tip
down bracket N and allow the drill cable to be tipped down, and when raised to be
set fast at the required position.
O
The following is the operation of the improved dental engine.
The length of the crane arm is regulated as required by means of the slot W, the
set screw X, and button Y, and the adjustment of the extension arm B. It will be
seen that the arm B is moved out or in the slot W, passing the shank Y¹ of the
button Y until the arm is sufficiently extended or shortened. The set screw X is
then set fast. The pinion K is then placed in gear with the wheel H as shown in
Figure 1. If the gear be too loose, then the adjusting screw S is operated by the
thumb piece V, raising the wheel H against the pinion K as may be required to
ensure the required traction.
The cord F gives motion to the wheel H by means of the pulley G, and consequently
revolves the pinion K. When the pinion K is required to revolve in an opposite
direction, the screw S is again operated to withdraw the spindle J and J¹, and bring
the wheel I in contact with the upper side of the pinion K, thereby revolving the
same in an opposite direction from that given by the contact with the wheel H.
When the machine is not required to be operated, the cable is tipped down to a
vertical position by loosening the jaws M, which open sufficiently to allow the same
to revolve freely upon the sleeve journal Z, until the drill cable reaches the vertical
position as required.
In Figure 3, the raising and lowering device has been shown, which serves to
regulate the contact of the gear, and to reverse the same, consisting of the sleeve P
with slot T, the part J with pin U the screw S and thumb piece V, except that the
sleeve P is attached directly to the bracket N, and the part J is attached to tip down
for the purpose of raising and lowering the pinion K instead of the spindle J, so that
the pinion K may be brought into gear with either the wheel H or the wheel I, for
the purpose of reversing the motion, as is well understood.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
1. In combination with the crane arm A, the crane arm extension B, by means of

page_text: the stationary set screw X, button Y, shank Y' and slot W, for the purpose of
extending and contracting the range of operation of the dental engine, constructed
and operated, substantially as and for the purposes set forth.
2. In combination with the crane arm of a dental engine, the gear G, H, I, and K,
by means of the sleeve P, slot T, spindle J and J', pin U, screw S, thumb-piece V,
cone bearings R and R', and the bracket N, jaws M, set screw O, the sleeve bearing Z,
the head block L, for the purpose of reversing the gear and adjusting the saine,
constructed and operated, substantially as and for the purposes set forth.
3. In combination with the head block L, the jaws M, set screw O, sleeve bearing Z,
and bracket N, for the purpose of adjusting the pinion K at any required point,
constructed and operated substantially as and for the purposes set forth.
WM. P. THOMPSON & Co.,
Agents for the Applicant.