Improvements in Dental Engines.
Year: 1887

page_text: Date of Application, 19th July. 1887
Complete Left, 19th Apr., 1888
Complete Accepted, 29th June, 1888
Improvements in Dental Engines.
1, WILLIAM RHILLIPS 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 Holhorn, 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 such metal as is usually employed in
the manufacture of that class of machinery. A plate is used with screw for attaching
to the wall near where the dentist's operating chair is placed. By means of lugs
the crane is attached, composed of a bracket, crane-arm, extension piece, and brace
and suitable adjusting screw. To the end of the extension-arm, a piece is attached,
and drilled to receive the attaching rod, and the seat for the tension spring. The
attaching rod is formed with an enlarged and conical part, to form the bearing of a
connecting cone driving pulley, and to bear upon the top of a frame or bracket to
hold the same to a proper bearing upon the top of the end piece of the extension arm.
A thread is cut upon the lower end of the attaching rod, for attaching a screw thumb
piece, and placing a cable attaching hook. A connecting cone driving pulley is placed
down upon the fixed cone bearing and the movable cone-bearing is adjusted by a
set-screw. The framing or hanger is formed with a standard to serve as a bearing
for the journals of the training shives or pulleys. The outer end of the framing or
hanger is drilled to receive a vertical outer sleeve which supports an adjustable sleeve,
which supports the jointed head block post. A recess is formed to receive a set-
clamp or ring, which is used for setting the outer sleeve fast when adjusted. The
outer sleeve is formed with a vertical slot at the top and an inner sleeve with spiral
slot to fit into the outer sleeve. The jointed head-block post fits in the said inner
sleeve.

page_text: A head-block for the cable pulley to work in is composed in part of a sleeve which
also forms the bearing of the cable driving pulley. The connecting cone driving
pulley is connected with the driving power by means of a cord which passes over
pulleys and around the upper groove of the same, and returns in an endless form
around back to the driving-power as is the case in all other machinery driven in a
similar manner.
The connecting cone driving pulley and the training shives or pulleys for the
driving cord are connected by means of an endless cord or belt, thus revolving the
cable driving pulley, and consequently the drill cable. The cable may be turned at
any required angle by swinging around upon the before mentioned pivot shaft
or rod.
The following is the operation of the improved Dental-Engine. The power is
transmitted from the driving pulley of the motor by means of the endless cord which
passes over a training pulley. It passes around the connecting cone driving pulley,
thereby giving motion to the same. The driving cord gives motion to the cable
driving pulley, thereby giving motion to the drill cable which operates the cable-rod,
which is either formed square and operates through
a square hole, through the said
cable driving pulley, or is feathered, or otherwise fitted by any well-known device
to slide freely through the pulley, while it is forced to revolve with the same.
The means of tipping the cable from a horizontal to a vertical position, and vice
versa, may be described as follows: A pin being firmly attached in the jointed head
block post, and extending through the spiral slot of the inner sleeve and the vertical
slot in the outer sleeve, the outer sleeve being fixed or set fast and the inner sleeve
being allowed to revolve, the lower edge of the said spiral slot being revolved against
the said pin, the inner sleeve is drawn down until the same is below the joint of the
jointed head block. The drill-head block with the drill-rod, etcetera, may be tipped
down until the cable hangs vertically.
It will be seen that while the head post is held up by the spring, the cord holds it
down by its bearing upon the cable driving pulley. The said spring also serves as a
tightener for the driving cord by pressing the cable driving pulley up.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Agents for the Applicant.

page_text: This invention relates to improvements in dental engines, which will be readily
understood by reference to the accompanying drawing, and the letters referring
thereto.
Figure 1 is a side elevation.
Figure 2 a plan view.
Figures 3 and 4 are broken, longitudinal sectional views cut vertically through the
centre.
Figures 5 and 6 are elevations, and
Figure 7 a broken, sectional view.
A represents a sleeve forming the outer portion of a crane-arm; B represents an
inner tube or bar forming the crane-arm extension; C represents the hinged crane-
bracket. D the plate for attaching to the wall; D₁ the bearings for the training-
pulleys E. E represents the training pulleys mounted on the bracket C. F represents
the driving cord; G represents a connecting cone driving pulley. H represents the
driving cord, which connects the cone pulley G with the cable driving pulley K.
I represents the training sheaves or pulleys for the cord H. J represents the journals
for the pulleys I. J¹ represents the standard, which serves as a bearing for tho
journal to operate in. K represents the cable driving pulley; L represents the
square or feathered end of the cable-rod by which the drill is revolved.
M represents the cable rod; N represents the head-block for the cable pulley to
operate in. O represents the flexible sleeve for the cable. P represents a hinged
post placed in the vertical tube R for the purpose of supporting the head block N.
Qrepresents the hinge or joint of the post P designed to allow the cable to tip down
from a horizontal to a vertical position.
R represents an adjustable inner sleeve, which operates in the outer sleeve T.
S represents the pin which is attached to the hinged post P, and extends through the
spiral slot W of the inner sleeve R, and the vertical slot X of the outer sleeve T.
T represents the vertical outer sleeve, which supports the adjustable sleeve, which
supports the post P and head block N, in which the cable pulley K operates.
represents the bearing-block for the post P. V represents the spring for holding
the bearing block U. W represents the spiral slot in the inner sleeve R. X represents-

page_text: the vertical slot in the outer sleeve. Y represents the set collar for setting the outer
slceve T fast, when adjusted. Z represents the set screw for the collar Y. A¹ represents
the pivoted hanger or bracket, which holds the sleeve T for the purpose of supporting
the head block N. It also supports the pulleys I. B represents the attaching rod,
which serves as the pivot or bearing for the bracket A¹, and the cone pulley G.
C¹ represents the fixed, and D¹ the movable cone bearing for the pulleys G, E and I
respectively. E¹ represents the set screw for the crane arm extension B. F' represents
the screw thumb piece for attaching the rod B₁.
G¹ represents the combined washer and cable hook. H₁ represents the tension
spring for the rod B¹. I represents the end of the extension arm B, which forms
the bearing of the rod B', and the rest for the bracket A¹. J¹ represents the standard
or pillow block in which journal J bears. K¹ represents the set screws for the
adjustable cone-bearings; L¹ represents the brace rod for the sleeve A. M' the
outer sleeve forming the upper portion of the head block, and the bearing for
the cable rod and the pulley K. N¹ represents the upper portion of the jointed
post P.
The following is the construction of the improved dental engine. It is constructed
of such metal as is usually employed in the manufacture of that class of machinery.
A plate D is employed with screw for attaching to the wall near where the dentist's
operating chair is placed. By means of lugs as shown in Figures 1, 2, and 3, the
crane is attached, composed of the bracket C, the crane arm A, extension B, and
brace L' and suitable adjusting screw E. To the end of the extension arm B, is
attached the part 1', and the same drilled to receive the rod B₁, and the seat for the
spring H¹. The rod B¹ is formed with the enlarged and conical part C³, to form the
bearing of the pulley G, and to bear upon the top of the hanger or bracket A', to
hold the same to a proper bearing upon the top of the part 1. A thread is cut upon
the lower end of the rod B', and the nut F attached, placing the cable attaching
hook G. The pulley G is placed down upon cone C¹, and the movable cone-bearing 1)1
is adjusted by a set screw K¹. The hanger A¹ is formed with the standard Ji, to
serve as a bearing for the journals J of the pulleys I. The outer end of the hanger A¹
is drilled to receive the sleeve T. The recess is formed to receive the set clamp or
ring Y. The sleeve T is formed with a vertical slot X at the top, and the sleeve R
with spiral slot W to fit in the sleeve T, and the jointed head block P to fit in the
sleeve R.
The head block N is composed in part of the sleeve M³, which forms the bearing of
the pulley K. The pulley G is connected with the driving power by means of the
cord F, which passes over the pulleys E and around the upper groove of the same,
and returns in an endless form around back to the driving power, as is the case in all
other machinery driven in a similar manner.
The pulleys G and I are connected by means of the endless cord or belt H, thus
revolving the pulley K, and consequently the drill cable. The cable may be turned
at any required angle by swinging around upon the pivot shaft or rod B¹.
The following is the operation of the improved dental engine. The power is trans-
mitted from the driving pulley of the motor, by means of the endless cord F, which
passes over the pulley E. It passes around the cone pulley G, thereby giving motion
to the same. The cord H gives motion to the pulley K, thereby giving motion to the
drill cable, which operates the cable rod L, which is either formed square and operates
through a square hole, through the pulley K as shown in Figure 4, or is feathered or
otherwise fitted by any well known device to slide freely through the pulley, while
it is forced to revolve with the same.
The means of tipping the cable from a horizontal to a vertical position, and vice
versa, may be described as follows: The pin S being firmly attached in the post P,
and extending through the spiral slot W and the vertical slot X, the tube I being
fixed or set fast, and the sleeve R, being allowed to revolve, the lower edge of the
spiral groove W, being revolved against the pin S, the sleeve R is drawn down until
the same is below the joint Q. The drill head N with the drill rod etcetera, may be
tipped down until the cable hangs vertically.

page_text: It will be seen that while the post P is held up by the spring V, the cord holds it
down by its bearing upon the pulley K. The spring V also serves as a tightener for
the cord H by pressing the pulley K up.
Having now particularly described and ascertained the nature of the said inven-
tion, 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 :-
In dental engines:
1st. The combination with a bracket of a sleeve secured thereto, and a strain rod
extending from the bracket to the outer end of the said sleeve.
2nd. The combination with a bracket and a sleeve of an adjustable sleeve, substan-
tially as and for the purposes set forth.
3rd. The combination with a bracket and sleeve secured thereto, of an adjustable
sleeve and a collar carrying a set screw to adjust the adjustable sleeve.
4th. The combination of a plate having perforated lugs, of a bracket having pivots
and a sleeve secured to said bracket, and serving as a support for the operating
mechanism, substantially as and for the purposes set forth.
5th. The combination with a stationary sleeve, of an adjustable sleeve, a tubular
post or sleeve R attached to the latter, a vertical jointed shaft in said post, a head
block N, mounted on said shaft, a sleeve supported by said head block, a drill rod
and the drilling mechanism employed by the latter, substantially as and for the purposes
set forth.
6th. The combination with a tubular support of a pipe or tube adapted to be auto-
matically adjusted therein, a drill head post, and a drill head jointed thereto, substan-
tially as and for the purposes set forth.
7th. The combination, with a tubular support, and a spring in the bottom thereof,
of a vertically adjustable sleeve, located in the said support, a drill head post,
located in said sleeve, and a drill head jointed to said post, substantially as and for
the purposes set forth.
1011
1000
WM. P. THOMPSON & Co.,
Agents for the Applicant.