An Angle Attachment for Dental Engines.
Year: 1893

page_text: Date of Application, 28th Nov., 1893
Complete Specification Left, 28th Sept., 1894-Accepted, 3rd Nov., 1894
PROVISIONAL SPECIFICATION.
An Angle Attachment for Dental Engines.
I, RUFUS GOLDSMITH STANBROUGH, Dentist, of 203 West 52nd Street, City
in the County and State of New York, United States of America, do hereby
declare the nature of this invention to be as follows:-
This invention relates to angle attachments for dental engines, and has for one
of its objects the secure holding of the burr or drill in its place in the instrument,
and in its easy removal therefrom. Another object of my improvements is to
provide for the taking up of wear in the moving parts.
Attachments of the kind to which my improvements apply consist essentially of
a handle provided with a head-piece. The drill is placed in a chuck within this
head-piece, so that its length is at a right-angle to that of the handle. This chuck
is provided with a bevel pinion which meshes with a like pinion on the end of the
drive-shaft. This latter extends lengthwise through the handle of the attachment
and is provided at its rear end with proper couplings to enable it to be attached to
the rotating spindle of the dental engine.
It is essential in such an instrument that the disc should be firmly held in position
as should it come out in the process of drilling, it would cause serious injury to the
person being operated upon. It is also very desirable to have the drill held in
such a manner that it can be quickly removed and put in place by the operator.
I accomplish these desirable results by constructing the drills so that they may
be inserted through the top or head of the chuck and by making the upper bearing
in the form of a cap mounted upon the end of an arm pivoted upon the handle.
The upper surface of this arm is made taper and its head is held down upon the
top of the chuck chamber by means of a ring sliding over this arm and the
supporting handle. The drill itself is made of a larger diameter for its upper half
and fits into a similarly shaped cavity in the chuck. To prevent the drill turning
in the chuck it is provided with a longitudinal groove, and the chuck with a fin or
feather fitting into the same. The upper end of the drill is pointed and is seated
in a bearing in the movable cap or head. This bearing is formed in the end of a
screw passing through the movable head and is thus adjustable to a nicety. In
providing for taking up the wear of the instrument, I make the handle in two parts,
the forward one carrying the chuck chamber. Each part of the handle screws
upon a sleeve through the center of which the drive-shaft passes. The sleeve is
provided with an annular abutment which limits the distance the parts of the
handles can be screwed upon it. With this construction by screwing the portion of
the arm carrying the chuck chamber forward or backward the chuck bevel pinion
may be brought into more or less contact with the bevel pinion on the drive shaft.
To provide for a still closer adjustment, the drive-shaft is made adjustable in the
sleeve above mentioned, by means of a movable abutment upon the shaft which is
held in place by a jam-nut. By my improvements, I produce an instrument, simple
in construction, and safe and serviceable in action.
Dated the 27th day of November 1893.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.

page_text: 1, RUFUS GOLDSMITH STANBROUGH, Dentist, of 203 West 52nd Street, City,
County and State of New York, United States of America, do hereby declare
the nature of this invention and in what manner the same is to be performed, to
he particularly described and ascertained in and by the following statement :-
This invention relates to angle attachments for dental engines, and has for one
of its objects the secure holding of the burr or drill in its place in the instrument,
and in its easy removal therefrom. Another object of my improvements is to
provide for the taking up of wear in the moving parts.
Attachments of the kind to which my improvements apply consist essentially of
a handle provided with a headpiece. The drill is placed in a chuck within this
head-piece, so that its length is at a right-angle to that of the handle. This chuck
is provided with a bevel pinion which meshes with a like pinion on the end of the
drive-shaft. This latter extends lengthwise through the handle of the attachment
and is provided at its rear end with proper couplings to enable it to be attached to
the rotating spindle of the dental engine.
It is essential in such an instrument that the disc should be firmly held in position
as should it come out in the process of drilling, it would cause serious injury to the
person being operated upon. It is also very desirable to have the drill held in
such a manner that it can be quickly removed and put in place by the operator.
I accomplish these desirable results by constructing the drills so that they may
be inserted through the top or head of the chuck and by making the upper bearings
in the faces of a cap mounted upon the end of an arm pivoted upon the handle.
The upper surface of this arm is made taper and its head is held down upon the top
of the chuck chamber by means of a ring sliding over this arm and the supporting
handle. The drill itself is made of a larger diameter for its upper half and fits
into a similarly shaped cavity in the chuck. To prevent the drill turning in the
chuck it is provided with a longitudinal groove, and the chuck with a fin or feather
fitting into the same. The upper end of the drill is pointed and is seated in a
bearing in the movable cap or head. This bearing is formed in the end of a screw
passing through the movable head and is thus adjustable to a nicety. In providing
for taking up the wear of the instrument, 1 make the handle in two parts, the
forward one carrying the chuck chamber. Each part of the handle screws upon a
sleeve through the center of which the drive-shaft passes. The sleeve is provided
with an annular abutment which limits the distance the parts of the handles can be
screwed upon it. With this construction by screwing the portion of the arm
carrying the chuck chamber forward or backward the chuck bevel pinion may be
brought into more or less contact with the bevel pinion of the drive shaft. To
provide for a still closer adjustment, the drive-shaft is made adjustable in the sleeve
above mentioned, by means of a movable abutment upon the shaft which is held in
place by a jam-nut. By my improvements, I produce an instrument, simple in
construction, and safe and serviceable in action.
In the drawings illustrating my invention,
Fig. 1, is longitudinal sectional view of my improved device:
Fig. 2, illustrates the chuck in various views;
Fig. 3, shows the form of operating tool I prefer to use.
Fig. 4, is a longitudinal sectional view of a modified form of my improvement;
Fig. 5, is a detail of the driving shaft employed in the modified form of my
device shown in Fig. 4, and
Fig. 6, is a modification of the chuck.
Referring to Figs. 1, 2, and 3, a is the cylindrical hand-piece, carrying at its free
end the right-angled, tubular projection or chamber b, the bottom wall of which is

page_text: conically recessed or hollowed out, at b', as shown in Fig. 1. From the upper
surface of the hand-piece a, extends the lugs c, c, between which is pivoted or
journaled the arm d, terminating rearwardly in the upwardly inclined finger d', and.
being provided at its free end with a cap or socket e, the inner surface of which is
concaved, as at e', and which coincides with, and forms an extension of the
chamber b. Said cap e, is also centrally tapped to receive a set screw f, the lower
end of which is conically recessed as at As shown in the drawings, the upper
surface of arm d, is an inclined plane, and the clamp g, is passed around the hand-
piece a, and over the arm d. Through the cylindrical hand-piece a, runs the usual
driving shaft h, connected to the gear-shaft h', which terminates in the beveled
gear i, projecting slightly into the chamber. Within said chamber, and at an
angle to the gear-shaft, is the drill chuck j, the lower end of which is cone-
shaped to fit in the cone bearing b, and the upper end is provided with the head k,
having its top convexed, to correspond with the concavity e', in cap e, and carrying
upon its under side teeth engaging with those of the bevel gear i, on shaft h¹. Said
chuck is also provided with the annular groove or recess m, within which enters
the set screw n, passing through the wall of chamber b, and serving to keep said
chuck in its position in chamber b, when cap e, is removed. The interior of
chuck j, is preferably of two diameters o, p, the larger being above the smaller and
joined to it by the incline 7, and the larger diameter is provided throughout its
length with the feather or spline r.
The form of operating tool which I prefer to use with this form of my improved
device is shown at s, Fig. 3, and consists of the stock t, the upper end of which is
pointed at u, and lower end is beveled at v, to fit into the incline q, of the chuck.
The pointed portion u, fits into the conical recess f1, of set screw f. The said
operating tool is also provided with the groove w, which engages with the featherr,
of the chuck. The operating tool is placed in position in the chuck through the
top, and the arm d, is swung to the position shown in Fig. 1, and clamp g, is moved
forward until it engages with incline d', holding the cap e, firmly in its closed
position as shown. In this position, the cap e, forms an upper bearing for the
chuck, and the set screw f, will form a similar bearing for the operating tool. The
inclined bearing 9, of the chuck will prevent the operating tool from dropping out
of said chuck, and any wear thereon can be easily taken up by set screw f.
Referring now to Figs. 4, 5, and 6. In this form of my device I arrange the
chuck chamber A, to screw on the holder B, and regulate the same by jam nut C.
The chuck chamber A, is provided with an aperture in its bottom wall, into which
the lower part of chuck I, fits, said chuck being retained in position in said chamber
by shoulder I', bearing against the lower wall of chuck chamber A. The ferrule D,
is also arranged to screw out to the rear end of holder B, the movement of both
chamber A, and ferrule D, being limited by stop E, on holder B. The driving
shaft F, is provided at its free end with cone bead. G, carrying beveled gear H,
which meshes with the gear on chuck I, said cone-head G, having a cone bearing J,
at the outer end of holder B. The opposite end of holder B, is also provided with
a bearing K, to receive the conical collar L, which is provided with a feather to
engage slot or groove M, on shaft F, and prevent said collar from turning about
said shaft. I also provide a jam nut N, working on screw-threaded portion O, of
shaft F, and adapted to move collar L, further into bearing K. The shaft F, is
also provided with a stop P, to limit the movement of jam nut N. In this con-
struction I prefer to substitute the swinging plate Q, for the cap e, and arm d, of
Fig. 1, and I also may provide the chuck I, with the collar or ring R, which will
in this case contain the bevel seat or bearing S. By this means I am enabled to
compensate for wear of the parts, and also to adapt the chuck for operating tools
having a slight difference in length of the stocks.
As the parts become worn in use, the chuck chamber A, may be screwed further
on to shoulder B; the collar L, moved by means of jam nut N, further into its seat
in holder B, and the ring R, screwed further into the bottom of chuck chamber A.
It will be seen that by my invention I provide an angle attachment in which the

page_text: operating tool is firmly held, and from which it may be easily and quickly removed,
and that the parts exposed to wear can be readily adjusted or replaced when
worn.
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
CLAIMS.
1. An angle attachment for dental engines consisting of a cylindrical handle
through which passes a drive-shaft; a head-piece carrying a rotary chuck adapted
to be rotated by the drive-shaft, and a pivoted arm carrying a cap, said cap forming
an upper bearing for the chuck when the arm is in its closed position, substantially
as described.
2. In an angle attachment for dental engines, a rotary tubular chuck having a
lower cone-shaped portion and a head carrying beveled gear; a movable upper
bearing and a stationary lower bearing for said chuck; and a drive-shaft carrying
a beveled gear meshing with gear on the chuck, substantially as described.
3. A tubular chuck for angle attachments having its interior of two diameters
one of which is provided with a spline or feather; said chuck having a lower cone-
shaped portion and a head carrying beveled gear, and being provided with an
annular exterior groove; and means for holding and rotating the chuck, substan-
tially as described.
4. The combination of a hand-piece, through which passes a drive-shaft carrying
beveled gear; a head-piece carrying a rotary chuck mounted in cone-bearings
therein, said chuck having beveled gear engaging with the gear on the drive shaft,
and being provided with an internal spline or feather; an operating tool grooved to
engage said feather; and a pivoted arm carrying a cap provided with a set screw,
said cap and set screw forming cone-bearings for the chuck and operating tool,
respectively, substantially as described.
5. A rotary chuck having its interior of two diameters one of which is provided
with a spline or feather; an operating tool having a movable upper bearing and
being adapted to enter and fit the chuck, and means for imparting rotary motion to
the operating tool, substantially as described.
6. An angle attachment for dental engines consisting of a cylindrical handle
through which passes a drive-shaft; a head-piece carrying a rotary chuck adapted
to be rotated by the drive-shaft, and a pivoted arm carrying a cap, said cap forming
an upper bearing for the chuck when the arm is in its closed position, and a clamp
for holding said arm in its closed position, substantially as described.
7. An angle attachment for dental engines consisting of a tubular handle
carrying the drive-shaft, and provided with a stop of shoulder, a head-piece
carrying the chuck, means for adjusting the head-piece upon the handle, and means
for rotating the chuck, substantially as described.
8. An angle attachment for dental engines consisting of a tubular handle
carrying a drive-shaft, having adjustable bearings therein, a head-piece adjustably
secured to the handle, and provided with an adjustable bottom wall, a chuck in
said head-piece having an adjustable lower bearing for the operating tool, and a
movable plate constituting an upper bearing for the chuck and operating tool
substantially as described.
9. An angle attachment for dental engines consisting of a tubular handle, a head-
piece longitudinally adjustable upon said handle, and having an adjustable bottom
wall, a chuck located in said head-piece, means for retaining an operating tool in
said chuck and a drive-shaft located in the handle and having adjustable bearings
therein, substantially as described.
10. In an angle attachment for dental engines, a tubular handle, a drive-shaf
having adjustable bearings therein, in combination with a head-piece adjustably
secured to the handle, and provided with an adjustable ring forming the botton

page_text: wall thereof and a chuck located in the head-piece and adapted to be adjusted by
means of said ring, substantially as described.
11. A chuck for angle attachments consisting of a substantially spool-shaped
portion carrying beveled gear, and an adjustable downwardly extending portion
forming a lower bearing for the operating tool in combination with a handle
carrying the drive-shaft and a head-piece carrying the chuck, substantially as.
described.
Dated the 27th day of September 1894.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.