Improvements in Dental Engines.
Year: 1895

page_text: Date of Application, 2nd Nov., 1895
Complete Specification Left, 9th Nov., 1895-Accepted, 18th Jan., 1896
Improvements in Dental Engines.
I, ARTHUR WILLIAM BROWNE, of Prince's Bay, in the County of Richmoud,
and State of New York, United States of America, Manufacturer, do hereby
declare the nature of this invention to be as follows:-
My invention relates to certain improvements, as hereinafter claimed, in dental.
engines, applicable to the bearings for the driving shafts, to the bearings for the
pitman connections with the crank pins of the driving shafts, and to the bearings
for the driven shafts by way of which motion is communicated to the dental tools
to be operated. My objects are to provide durable and simply constructed ball-
bearings for ensuring easy working of the driving-shafts, the pitman connections,
and the driven shafts of dental engines.
In the accompanying drawings,
Figure 1, Sheet 1, is a view in perspective of a portion of a suitably constructed
dental engine embodying my improvements.
Fig. 2, Sheet 2, is a view on a larger scale, partly in elevation and partly in
vertical central section through portions of the engine, and
Fig. 3 is a detail view showing a modification.
Fig. 4, Sheet 3, is a view partly in elevation and partly in section through
portions of the engine, showing a modifications of the bearings for the driving
shaft.
Fig. 1, Sheet 4, is a view in perspective, on a smaller scale than the remaining
views, showing a complete dental engine of suitable construction to embody all
my improvements.
Fig. 2, Sheet 5, is a view in elevation of the pitman and the crank-pin having
ball-bearing connection therewith and adapted for attachment to the crank of the
driving shaft; and
Fig. 3 is a view partly in vertical central section and partly in elevation at
a right angle with Fig. 2.
Fig. 4 is a view partly in elevation and partly in vertical central section as
indicated by the line 4 of Fig. 5, showing the upper portion of the engine standard,
the pulley head mounted at the top thereof, a portion of the driven shaft by way
of which motion is communicated to the dental tool to be actuated, and the bearings
for this shaft.
Fig. 5 is a plan view showing a portion of the pulley head with attachments
thereof.
Fig. 6 is a view partly in elevation and partly in section on the line 6 of Fig. 5.
Fig. 7 a view partly in elevation and partly in section on the line 7 of Fig. 5.
Fig. 8 is a detail view partly in elevation and partly in section, showing a
medification of the pitman and crank pin connection.
Referring now to Figs. 1 and 2, Sheets 1 and 2 of the drawings, A indicates the
base and A¹ the standard or upright portion of the supporting frame of the engine.
At the upper end of the standard portion of the engine frame the driving shaft B
is supported, and the driving wheel B1 is secured to one end of this shaft, and the
crank C provided at the other end thereof, whilst by way of a treadle C1 and a
pitman D provided with an off-centre spring d, motion is imparted to the driving
wheel, as will readily be understood. The bearing for the driving shaft is formed
as follows: A bearing-opening E provided in the engine-frame at the top of the
standard portion thereof, is formed for a portion of its length between its ends of a.

page_text: diameter slightly exceeding the diameter of the driving-shaft which extends
through the opening without coming in contact therewith. At and adjacent to its
ends the bearing opening is of greater diameter than at its intermediate portion,
these enlarged end portions of the bearing opening terminating, respectively, by
way of curved annular shoulders F G in the intermediate reduced portion of the
opening which loosely surrounds the driving shaft.
""
At the crank end of the driving-shaft it has suitably fastened to it, inside the
crank, a collar or short sleeve I having the annular inclined or "cone-bearing
surface i between which and the bearing surface formed by the curved shoulder F
of the bearing-opening anti-friction balls J are confined. The balls extend around
the driving-shaft, it will be understood, but are not in contact therewith as they
roll in contact only with the cone-bearing sleeve I and curved bearing surface
provided by the shoulder F of the bearing-opening. The cone-bearing sleeve
enters loosely or without frictional contact into the enlarged end portion of the
bearing-opening adjacent to the driving-shaft crank. The end of the driving shaft
to which the driving-wheel is secured is screw-threaded, has a split clamp nut K
thereon inside the driving-wheel, and is provided with a groove k extending
longitudinally thereof. A cone-bearing sleeve L is adjustably mounted on the
driving shaft inside the nut K, and enters, without frictional contact, the enlarged
end of the bearing-opening provided with the curved annular bearing surface G.
A screw m in the cone-bearing sleeve L and projecting into the shaft groove k,
serves to prevent the turning of this sleeve whilst allowing it to be adjusted along
the driving shaft. By turning the clamp nut the cone-bearing sleeve L may be
moved inward as desired, and it is held in its adjusted position or against outward
movement by this nut. Anti-friction balls n similar to the balls J, are confined,
out of contact with the driving shaft, so as to bear upon the proper surface of the
cone-bearing sleeve L and against the curved bearing surface formed by the
annular shoulder G of the bearing opening E.
The driven-pulley standard or rocking upright H of the engine is mounted. by
its forks HH to rock slightly about journals on that portion of the engine frame
in which the bearing-opening E is provided, the standard forks engaging the
journals outside the annular shoulders h h¹ formed on the frame.
A screw-attached oil-inlet tube or nipple E' serves to convey lubricant to the
bearing-opening to thoroughly lubricate the balls and the surfaces against which
they bear.
From the above description it will be seen that the part may readily be assembled
in working condition and quickly separated; that there is no wear of the driving-
shaft and that wear of the balls and the surfaces in contact with which they
work may quickly be taken up or compensated for by manipulation of the
adjusting nut.
If preferred my improvements may be modified as shown by Fig. 3, by screw-
threading the hub of the driving-wheel so that it will constitute a nut screwing on
the driving shaft so as to perform the function of adjusting the adjustable cone-
bearing in place of the nut K. To operate the hub of the driving-wheel as an
adjusting nut the screw P is loosened, and after properly adjusting the adjustable
cone-bearing by turning the wheel this screw is tightened to lock the wheel to its
shaft.
Referring next to Sheet 3 of the drawings, A. is a portion of the engine frame,
B the driving shaft, B₁ the driving-wheel, and C the crank, as above described.
The bearing-opening E at the top of the engine frame is of uniform diameter from
end to end, instead of being made of different diameters for different portions of
its length as before described, and is bushed or provided at its ends with sleeves F G
each of which projects into the frame bearing-opening for a portion only of its
length. The unoccupied space within the bearing opening E about the driving-
shaft between the inner ends of the bearing sleeves FG constitutes an oil
chamber e with which the screw-attached oil-inlet tube or nipple E' communicates.
The bearing sleeves are fitted tightly in the bearing-opening and are provided,

page_text: respectively, with annular shoulders and 9 which abut against the frame at the
ends of the bearing-opening therein when the sleeves are properly adjusted. The
bearing sleeves do not come in contact with the driving-shaft, the diameter of
which is slightly less than the least internal diameter of these sleeves. At and
adjacent to their outer ends the bearing sleeves are of increased internal diameter,
these internally enlarged portions of the sleeves terminating, respectively, by way
of curved annular shoulders f¹ and g¹ in the reduced portions of these bearings
which loosely surround the driving shaft.
The driven-pulley standard or rocking upright H of the engine is mounted by
its forks H H to rock about journals formed on the bearing sleeves F G outside
the annular shoulders h' of these sleeves.
The
At the crank end of the driving shaft it has suitably fastened to it the collar or
short sleeve I having the annular inclined or "cone-bearing" surface i between
which and the bearing surface formed by the curved shoulder f¹ of the sleeve F
the anti-friction balls J are confined. The balls extend around the driving shaft,
but are not in contact therewith as they roll in contact only with the cone-bearing
sleeve I and curved bearing f¹ of the sleeve F. The cone-bearing sleeve I fits
loosely or without frictional contact in the bearing sleeve F at its outer end.
end of the driving shaft to which the driving wheel is secured, is screw threaded,
has a split clamp nut K thereon inside the driving wheel, and is provided with a
groovek extending longitudinally thereof, as before described, and the cone-
bearing sleeve L is adjustably mounted on the driving shaft inside the nut K and
projects into the outer end of the bearing sleeve G. The cone-bearing sleeve L
may be moved inward as desired and it is held in its adjusted position, or against
outward movement, by the nut in the same way as before explained. Anti-friction
balls n, similar to the balls J, are confined, out of contact with the driving shaft,
so as to bear upon the proper surface of the cone-bearing sleeve L and against
the curved surface g' of the bearing sleeve G.
From the above description it will be seen that by the provision of the bearing
sleeves F and G the frame bearing-opening is completely protected against wear
which is not the case when the balls bear against portions of this opening as shown
on Sheets 1 and 2 of the drawings. It will also be seen that the construction of
the bearing sleeves and manner of attaching them are such that the rocking
standard is suitably supported to rock about these bearing-sleeves as journals.
Referring next to Sheets 4 and 5 of the drawings, it will be seen that an adjust❤
able ball-bearing connection between the pitman D and the pin D¹ which is secured
to the driving-shaft crank, is made in the following way--A bearing-opening E
is provided in the enlarged upper end or head of the pitman, and this opening is
screw-threaded to receive the two externally threaded short sleeves E¹ E' which
are formed with the annular inclined inner surface e e, thus adapting them to serve
as cone-bearing sleeves which may be screwed in place and adjusted as desired by
means of a spanner wrench adapted to engage the slots or nicks e¹ in them. The
crank pin passes through the cone-bearing sleeves loosely or out of contact with
them, and is provided with the annular groove f, concave in cross-section and con-
stituting a bearing surface in contact with the anti-friction balls F which are
enclosed in the bearing-opening between the cone-bearing sleeves.
A slot G is formed in the pitman near its upper end and extends to the bearing-
opening, and a clamp screw 9 passing through the pitman and crossing the slot at
or near its upper end serves to slightly vary the size of the bearing-opening and so
adapt it to properly' embrace the cone-bearing sleeves.
It will be seen that the parts may be quickly assembled to work with the least
possible friction, and readily separated and that wear may be taken up or
compensated for by slight adjustment of the bearing sleeves, whilst by adjustment
of the screw g the bearing sleeves may be clamped against accidental movement in
the bearing opening. Engagement of the balls with the grooved surface of the
crank-pin obviously prevents the pitman from becoming disconnected from the
crank-pin.

page_text: In Fig. 8 a modification is shown in which the grooved bearing surface is
omitted from the crank-pin, and the head of this pin is flanged so as to slightly lap
the cone-bearing sleeve E to prevent accidental disengagement of the pitman from
the crank-pin.
The rocking upright or standard H of the engine, adapted to rock about journals
at the upper end of the upright portion A' of the engine frame, is made in sections
80 as to be adjustable in length and carries a vertically-rocking and horizontally
turning pulley-head H³ at its upper end, as is well understood. Instead of the
usual way of mounting the driven-shaft by way of which motion is imparted to
the tool to be operated, this shaft is mounted as follows:-The tubular portion I of
the pulley-head provides a bearing-opening in which the bearings for the driven-
shaft are mounted. The bearing-opening is provided at one end with an inclined
or cone-bearing surface shown as formed by a short cone-bearing sleeve J suitably
fastened in place. Slightly separated from this fixed cone-bearing sleeve is a longer
cone-bearing sleeve J'adjustable in the bearing-opening toward and from the fixed
bearing sleeve. This adjustable sleeve is screw threaded to engage the threaded bearing-
opening. Another cone-bearing sleeve K is adjustable in the bearing-opening, with
which it has screw-threaded connection; and projecting into the end of the bearing-
opening opposite that provided with the fixed cone-bearing sleeve J, is a cone-bearing
sleeve L which is screw threaded for engagement with the threaded bearing opening.
A shoulder L' on the sleeve L abuts against the end of the tube I constituting the
bearing-opening of the pulley-head when this sleeve is tightly screwed in place so
as to leave a slight space between its inclined inner end and the adjacent inclined
end of the bearing sleeve K. Holes kk are formed around the adjustable cone-
bearing sleeves JK, and the pulley-head tube is formed with two transverse
slots M M through which a pin may be inserted to engage the holes in the
'sleeves and K to turn and adjust then. A slot m extends longitudinally of
the pulley-head tube part way its length over the cone-bearings, and a clamp
screw N passing through the lugs nn at opposite sides of the slot m serves to
compress the tube and securely clamp the adjustable cone-bearing sleeves in their
position of adjustment. Within the cone-bearing sleeves, but not in contact with
them, is the tubular journal O of the driven shaft. This journal projects at one
end beyond the bearing-opening and has the driven-pulley P fastened to it by a
screw p passing through the hub of the pulley. An annular shoulder or collar o
is provided upon the journal O near its end opposite that to which the pulley is
secured, and the end cone-bearing sleeve L has an internal shoulder / formed upon
it which serves to limit outward movement of the tubular journal. This bearing
sleeve has its reduced end portion externally threaded for making connection in
well known way with the sheath of the ordinary flexible driving shaft. The stiff
section Q of such flexible driving shaft is mounted in the journal O and revolves
with it. The screw p entering the groove p¹ extending longitudinally of the shaft
section (see dotted lines Fig. 4) causes it to rotate with the driven-pulley and
journal, whilst allowing it to have desirable slight end wise movement. Anti-friction
balls R in contact with the driven-shaft journal O are confined between the inclined
surfaces of the cone-bearing sleeves J and J', and other anti-friction balls R'
against which the journal bears are confined between the inclined bearing surfaces
of the sleeves K and L.
P
It will be seen that the various parts of the driven-shaft bearings may be readily
arranged in the bearing-opening of the pulley-head and quickly detached, and that
by adjustment of the pair of adjustable cone-bearing sleeves the balls may be kept
in proper working contact with the journal and with the inclined surfaces of
their respective bearing sleeves, wear of the parts being easily taken up or
compensated for.
Dated this 18th day of October 1805

page_text: I, ARTHUR WILLIAM BROWNE, of Prince's Bay, in the County of Richmond,
and State of New York, United States of America, Manufacturer, 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:-
My invention relates to certain improvements, as hereinafter claimed, in dental
engines, applicable to the bearings for the driving shafts, to the bearings for the
pitman connections with the crank pins of the driving shafts, and to the bearings for
the driven shafts by way of which motion is communicated to the dental tools to be.
operated. My objects are to provide durable and simply constructed ball-bearings:
for ensuring easy working of the driving-shafts, the pitman connections, and the
driven shafts of dental engines.
In the drawings left with the Provisional Specification
Figure 1, Sheet 1, is a view in perspective of a portion of a suitably constructed!
dental engine embodying my improvements.
Fig. 2 Sheet 2 is a view on a larger scale, partly in elevation and partly in
vertical central section through portions of the engine, and Fig. 3 is a detail view
eliowing a modification.
Fig. 4, Sheet 3, is a view partly in elevation and partly in section through
portions of the engine, showing a modification of the bearings for the driving
shaft.
Fig. 1, Sheet 4, is a view in perspective, on a smaller scale than the remaining
views, showing a complete dental engine of suitable construction to embody all my
improvements.
Fig. 2, Sheet 5, is a view in elevation, of the pitman and the crank pin having:
ball-bearing connection therewith and adapted for attachment to the crank of the
driving shaft, and
Fig. 3 is a view partly in vertical central section and partly in elevation at a.
right angle with Fig. 2.
Fig. 4, is a view partly in elevation and partly in vertical central section as.
indicated by the line 4 of Fig. 5, showing the upper portion of the engine standard,
the pulley head mounted at the top thereof, a portion of the driven shaft by way
of which motion is communicated to the dental tool to be actuated, and the bearings
for this shaft.
Fig. 5 is a plan view showing a portion of the pulley head with attachments.
thereof.
:
Fig. 6 is a view partly in elevation and partly in section on the line 6 of Fig. 5,
Fig. 7, a view partly in elevation and partly in section on the line 7 of Fig. 8.:
Fig. 8 is a detail view partly in elevation and partly in section showing a.
modification of the pitman and crank pin connection.
Referring now to Figs. 1 and 2, Sheets 1 and 2 of the drawings, A indicates the
base and A¹ the standard or upright portion of the supporting frame of the engine..
At the upper end of the standard portion of the engine frame the driving shaft. B
is supported, and the driving wheel B' is secured to one end of this shaft, and the
crank provided at the other end thereof, whilst by way of a treadle C¹ and a
pitman D provided with an off-centre spring d, motion is imparted to the driving
wheel, as will readily be understood. The bearing for the driving shaft is formed
as follows: A bearing-opening E provided in the engine frame at the top of the
standard portion thereof, is formed for a portion of its length between its ends of a
diameter slightly exceeding the diameter of the driving shaft which extends through.

page_text: the opening without coming in contact therewith. At and adjacent to its ends the
bearing opening is of greater diameter than at its intermediate portion, these
enlarged end portions of the bearing opening terminating, respectively, by way of
curved annular shoulders F G in the intermediate reduced portion of the opening
which loosely surrounds the driving shaft.
"
At the crank end of the driving-shaft it has suitably fastened to it, inside the
crank, a collar or short sleeve I having the annular inclined or "cone-bearing
surface between which and the bearing surface formed by the curved shoulder F
of the bearing-opening anti-friction balls J are confined. The balls extend around
the driving-shaft it will be understood, but are not in contact therewith as they roll
in contact only with the cone-bearing sleeve I and curved bearing surface provided
by the shoulder F of the bearing-opening. The cone-bearing sleeve enters loosely
or without frictional contact into the enlarged end portion of the bearing-opening
adjacent to the driving shaft crank. The end of the driving shaft to which the
driving wheel is secured is screw-threaded, has a split clamp nut K thereon inside
the driving-wheel, and is provided with a groove k extending longitudinally thereof.
A cone-bearing sleeve L is adjustably mounted on the driving shaft inside the
nut K, and enters, without frictional contact, the enlarged end of the bearing-
opening provided with the curved annular bearing surface G. A screw m in the
cone-bearing sleeve L and projecting into the shaft groove k, serves to prevent
the turning of this sleeve whilst allowing it to be adjusted along the driving-shaft.
By turning the clamp nut the cone bearing sleeve L may be moved inward as
desired, and it is held in its adjusted position or against outward movement by this
nut. Anti-friction balls n, similar to the balls J are confined out of contact with
the driving shaft so as to bear upon the proper surface of the cone bearing
sleeve L and against the curved bearing surface formed by the annular shoulder G
of the bearing opening E.
The driven pulley standard or rocking upright H of the engine is mounted by its
forks HH to rock slightly about journals ou that portion of the engine frame, in
which the bearing opening E is provided, the standard forks engaging the journals
outside the annular shoulders hh formed on the frame.
A screw-attached oil inlet tube or nipple E¹ serves to convey lubricant to the
bearing opening to thoroughly lubricate the balls and the surfaces against which
they bear.
From the above description it will be seen that the parts may readily be assembled
in working condition and quickly separated, that there is no wear of the driving
shaft, and that wear of the balls and the surfaces in contact with which they work,
may quickly be taken up or compensated for by manipulation of the adjusting nut.
If preferred my improvements may be modified as shown by Fig. 3 by screw-
threading the hub of the driving wheel so that it will constitute a nut screwing on
the driving shaft so as to perform the function of adjusting the adjustable cone-
bearing in place of the nut K. To operate the hub of the driving wheel as an
adjusting nut the screw P is loosened and after properly adjusting the adjustable
cone-bearing by turning the wheel this screw is tightened to lock the wheel to its
shaft.
Referring next to Sheet 3 of the drawings A is a portion of the engine frame,
B the driving shaft, B' the driving wheel, and C the crank as above described.
The bearing opening E at the top of the engine frame is of uniform diameter from
end to end, instead of being made of different diameters for different portions of
its length as before described, and is bushed or provided at its ends with
sleeves F. G. each of which projects into the frame bearing opening for a portion
only of its length. The unoccupied space within the bearing opening E about the
driving shaft between the inner ends of the bearing sleeves F. G constitutes an oil
chamber e with which the screw attached oil inlet tube or nipple E¹ communicates.
The bearing sleeves are fitted tightly in the bearing opening and are provided
respectively with annular shoulders and 9, which abut against the frame at the
ends of the bearing opening therein when the sleeves are properly adjusted. The

page_text: At anl
bearing sleeves do not come in contact with the driving shaft, the diameter of
which is slightly less than the least internal diameter of these sleeves.
adjacent to their outer ends the bearing sleeves are of increased internal diameter,
these internally enlarged portions of the sleeves terminating respectively by way
of curved annular shoulders f¹ and g¹ in the reduced portions of these bearings
which loosely surround the driving shaft.
The driven pulley standard or rocking upright H of the engine is mounted by its
forks HH to rock about journals formed on the bearing sleeves F G outside the
annular shoulders h, h¹ of these sleeves.
"
"
At the crank end of the driving shaft it has suitably fastened to it the collar or
short sleeve I having the annular inclined or cone bearing surface between
which and the bearing surface formed by the curved shoulder f¹ of the sleeve F,
the anti-friction balls J are confined. The balls extend around the driving shaft,
but are not in contact therewith as they roll in contact only with the cone-bearing
sleeve and curved bearing f¹ of the sleeve F. The cone bearing sleeve [ fits
loosely or without frictional contact in the bearing sleeve F at its outer end. The
end of the driving shaft to which the driving wheel is secured is screw threaded,
has a split clamp nut K thereon inside the driving wheel, and is provided with a
groove k extending longitudinally thereof, as before described, and the cone bearing
sleeve L is adjustably mounted on the driving shaft inside the nut K, and projects
into the outer end of the bearing sleeve G. The cone bearing sleeve L may be
moved inward as desired, and it is held in its adjusted position, or against outward
movement by the nut in the same way as before explained. Anti-friction balls
similar to the balls J are confined, out of contact with the driving shaft, so as to
bear upon the proper surface of the cone bearing sleeve L, and against the curved
surface gl of the bearing sleeve G.
From the above description, it will be seen that by the provision of the bearing
sleeves F and G, the frame bearing opening is completely protected against wear
which is not the case when the balls bear against portions of this opening, as shewn
on Sheets 1 and 2 of the drawings. It will also be seen that the construction of
the bearing sleeves and manner of attaching them are such that the rocking
standard is suitably supported to rock about these bearing sleeves as journals.
Referring next to Sheets 4 and 5 of the drawings, it will be seen that an
adjustable ball bearing connection between the pitman D and the pin D' which is
secured to the driving shaft crank, is made in the following way. A bearing
opening E is provided in the enlarged upper end or head of the pitman, and this
opening is screw threaded to receive the two externally threaded short sleeves E' E'
which are formed with the annular inclined inner surfaces ee, thus adapting them
to serve as cone bearing sleeves which may be screwed in place and adjusted as.
desired by means of a spanner wrench, adapted to engage the slots or nicks el in
them. The crank pin passes through the cone-bearing sleeves loosely. or out of
contact with them, and is provided with the annular groove f, concave in cross
section, and constituting a bearing surface in contact with the anti-friction balls F
which are enclosed in the bearing opening, between the cone bearing sleeves.
A slot G is formed in the pitman near its upper end and extends to the bearing
opening, and a clamp screw 9 passing through the pitman and crossing the slot at
or near its upper end serves to slightly vary the size of the bearing opening and so
adapt it to properly embrace the cone-bearing sleeves.
It will be seen that the parts may be quickly assembled to work with the least
possible friction, and readily separated and that wear may be taken up or
compensated for by slight adjustment of the bearing sleeves, whilst by adjustment
of the screw 9 the bearing sleeves may be clamped against accidental movement
in the bearing opening. Engagement of the balls with the grooved surface of the
crank pin obviously prevents the pitman from becoming disconnected from the
crank pin.
In Fig. 8 a modification is shown in which the grooved bearing surface is omitted
from the crank pin, and the head of this pin is flanged so as to slightly lap the

page_text: -cone bearing sleeve E³ to prevent accidental disengagement of the pitinan from the
-crank pin.
The rocking upright or standard H of the engine, adapted to rock about journals
at the upper end of the upright portion A¹ of the engine frame, is made in sections
so as to be adjustable in length and carries a vertically rocking and horizontally
Instead of the
turning pulley head H³ at its upper end, as is well understood.
usual way of mounting the driven shaft by way of which motion is imparted to the
tool to be operated, this shaft is mounted as follows:-The tubular portion of
the pulley head provides a bearing opening in which the bearings for the driven
shaft are mounted. This bearing opening is provided at one end with an inclined
or cone-bearing surface shown as formed by a short cone-bearing sleeve J suitably
fastened in place. Slightly separated from this fixed cone-bearing sleeve is a
longer cone bearing sleeve 1 adjustable in the bearing opening toward and from
the fixed bearing sleeve. This adjustable sleeve is screw threaded to engage the
threaded bearing opening. Another cone bearing sleeve K is adjustable in the
bearing opening, with which it has screw threaded connection; and projecting into
the end of the bearing opening opposite that provided with the fixed cone bearing
sleeve J, is a cone-bearing sleeve L which is screw threaded for engagement with
the threaded bearing opening. A shoulder L' on the sleeve Labuts against the
end of the tube I constituting the bearing opening of the pulley head when this
sleeve is tightly screwed in place so as to leave a slight space between its inclined
inner end and the adjacent inclined end of the bearing sleeve K. Holes k k¹ are
formed around the adjustable cone-bearing sleeves JK, and the pulley head tube
is formed with two transverse slots M M through which a pin may be inserted to
engage the holes in the sleeves J and K to turn and adjust them. A slot m extends
longitudinally of the pulley head tube part way its length over the cone bearings,
and a clamp screw N passing through the lugs n'n at opposite sides of the slot m
serves to compress the tube and securely clamp the adjustable cone-bearing sleeves
in their position of adjustment. Within the cone bearing sleeves, but not in
contact with them, is the tubular journal O of the driven shaft. This journal
projects at one end beyond the bearing opening and has the driven pulley P.
fastened to it by a screw p passing through the hub of the pulley. An annular
shoulder or collar o is provided upon the journal O near its end opposite that to
which the pulley is secured, and the end cone-bearing sleeve L has an internal
shoulder formed upon it which serves to limit outward movement of the tubular
journal. This bearing sleeve has its reduced end portion externally threaded
for making connection in well known way with the sheath of the ordinary flexible
driving shaft. The stiff section Q of such flexible driving shaft is mounted in the
journal O and revolves with it. The screw entering the groove p' extending
longitudinally of the shaft section Q (see dotted lines Fig. 4) causes it to rotate
with the driven pulley and journal, whilst allowing it to have desirable slight
end wise movement. Anti-friction balls R in contact with the driven shaft
journal O are confined between the inclined surfaces of the cone bearing sleeves J
and J, and other anti-friction balls R' against which the journal bears are
confined between the inclined bearing surfaces of the sleeves K and L.
It will be seen that the various parts of the driven shaft bearings may be readily
arranged in the bearing opening of the pulley head and quickly detached, and that
by adjustment of the pair of adjustable cone bearing sleeves the balls may be
kept in proper working contact with the journal, and with the inclined surfaces of
their respective bearing sleeves, wear of the parts being easily taken up or
⚫compensated for.
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 dental engine frame constructed with the bearing-
-opening having the enlarged end portions terminating in the curved bearing

page_text: surfaces, the driving shaft passing loosely through the bearing-opening, the cone--
bearing sleeve fast on one end of the driving shaft and entering the enlarged
portion of the bearing-opening at one end thereof, the cone-bearing sleeve entering
the other enlarged end portion of the bearing-opening and adjustable along the
driving shaft, means for adjusting this cone-bearing sleeve, and the two sets of
balls confined between the cone-bearing sleeves and the curved bearing surfaces of
the enlarged end portions of the bearing-opening, substantially as set forth.
2. The combination of the dental engine frame constructed with the bearing-
opening having the enlarged end portions terminating in the curved bearing-
surfaces, the driving-shaft passing loosely through the bearing-opening and screw
threaded at one end, the cone-bearing sleeve fast on the unthreaded end of the
driving shaft and entering the enlarged portion of the bearing-opening at one end
thereof, the adjustable cone-bearing sleeve on the threaded portion of the driving
shaft and projecting into the adjacent enlarged end portion of the bearing-opening,
the adjusting nut on the driving shaft, and the two sets of balls confined between.
the cone-bearing sleeves and the curved bearing surfaces of the enlarged end.
portions of the bearing opening, substantially as set forth.
3. The combination of the dental engine frame provided with the bearing-
opening the bearing-sleeves in the opposite ends of the bearing opening, each
having the internally enlarged portion and the curved bearing-surface, the driving-..
shaft passing loosely through the bearing-sleeves, the cone-bearing sleeve fast on
one end of the driving shaft and entering the enlarged portion of the bearing
sleeve at one end of the bearing-opening, the cone-bearing sleeve entering the -
enlarged portion of the bearing-sleeve at the other end of the bearing opening and
adjustable along the driving-shaft, means for adjusting this cone-bearing sleeve,.
and the two sets of balls confined between the cone-bearing sleeves and the curved
bearing-surfaces of the bearing-sleeves in the bearing opening of the frame,..
substantially as set forth.
. 4. The combination of the dental engine frame, provided with the bearing
opening, the bearing sleeves in the opposite ends of the bearing-opening, each.
constructed to provide a bearing surface for anti-friction balls and externally
shouldered, and the rocking standard of the engine mounted by its forks to rock..
about said bearing sleeves, substantially as set forth.
5. The combination in a dental engine, of the frame, the driving shaft provided
with the crank, the crank-pin having the grooved bearing surface, the pitman.
provided with the bearing-opening in its head, the cone-bearing sleeves adjustable
in said bearing-opening and the balls working in contact with the bearing sleeves.
and the grooved bearing surface of the crank pin, substantially as set forth.
6. The combination, in a dental engine, of the frame, the driving shaft provided
with the crank, the crank-pin, the pitman provided with the bearing-opening in its
head and having the slot extending to said opening, the clamp screw passing
through the slotted portion of the pitman, the cone-bearing sleeves adjustable in.
said bearing opening, and the balls in contact with the crank-pin and the bearing
sleeves, substantially as set forth.
7. The combination, in a dental engine, of the pulley-head provided with the -
bearing opening, the two non-adjustable cone-bearing sleeves in the bearing-
opening, the two adjustable cone-bearing sleeves in the bearing-opening, the
tubular journal in the conc-bearing sleeves, the two sets of balls in contact with.
the tubular journal and with their respective bearing sleeves,. the driven shaft
section passing through the tubular journal, and the pulley on said journal,
substantially as set forth.
8. The combination, in a dental engine, of the pulley-head provided with the
tubular portion constituting the bearing-opening and having the transverse slots,
the longitudinal slots, and the lugs at opposite sides of this longitudinal slot, the
clamp screw passing through the lugs, the two non-adjustable cone-bearing sleeves
in the bearing-opening, the two adjustable-cone bearing sleeves in the bearing-
opening, provided with the circumferential holes, the journal in the cone-bearing:
. B

page_text: sleeves, and the two sets of balls in contact with the journal and with their-
respective bearing-sleeves, substantially as set forth.
Dated this 9th day of November 1895.
CARPMAEL & Co.,
Agents for Applicant.