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Патент USA US2132503

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'Oct’. 11, 1938°
E. E. WELCH
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2,132,503
' MILLING AND PARALLELING MACHINE
Filed Aug. 18, 1957
2 Sheets-Sheet l
24'
INVENTOR.
.EYY/YUETE. Wm
A TTORNE Y.
0¢t.11,193s.
_
EEWELCH
*
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2,132,503
MILLING AND PARALLELING MACHINE
Filed Aug- 18, 1957
.
‘
2 Sheets-Sheet 2
INVENTOR.
EfU/QETJZZ ZIAZZG‘J
my a.
@%4w.
.4 TTORNE Y.
’
Patented Oct. 11, 1938
' ‘ 2,133,503
MILLING ANDPARALLELINGMAGHINE" '' 3'
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1Asturias“;Auguste, 1537‘; Serial No. 159,676 T
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My invention relates toal milling andlparallel
ing‘m'achinel
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vEmmet If]; WeIchJTopeka, Karis'.
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The object of my inventioniiislto-p "ovid’e a1 mill‘
ing‘xand'parallelingimachine, primarily for use in
the preparation of dental bridges, comprising a
90-21)
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wise rotation of'the'locking wheelll‘ii,untill'it'is'in
?rmicontact with the bearing t3: provides a brake’
to set the; carriage 9'a'gainstjmovementg
,
The seat '19‘ is‘slideablyunounted- on the" rails
It and I l. The shaft 20 is carried in they-bearings
rotating bit mounted above a seat arranged for 2i and 22 on the lower side of the seat member.
movement in a' plane normal to the axis of the bit. vA driving wheel 23 is af?xed at one end of the
A further object of my invention is to provide a shaft and a locking wheel 24 at the other end in
machine of the kind described in which the move ' threaded engagement with the shaft. The pinion
25 is?rmly affixed to the shaft 20 at its mid point 10
10 ment of the seat can be accomplished in two
and
engages the rack 26, set in the ?oor of the
directions precisely at ninety degrees.
These and other objects will. hereinafter be
carriage at D.
Rotation of the driving wheel 23 '
in which like characters apply to like parts in the
Clock
wise rotation of the locking wheel 24 will set the
different views:
seat against movement.
more fully explained. Referring tothe drawings
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moves the seat along the guides l0 and I I.
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An arm 21 is rigidly connected to the top of the
Figure 1~is an elevation of the machine showing
post 2 and extends therefrom to a point approxi- J
an adjustable base carrying a casting, posi
‘mately over the center of the base I. The free
tioned in the seat.
Figure 2 is a plan view of Figure 1 with the tool end of the arm 27 is bored at E to receive the
' sleeve 28. A cut at F allows the positioning of iii)
post shown in section.
Figure 3 is a fragmentary plan View showing the pinion gear 29, which is ‘mounted on the shaft
30. A slot at G extends from the cut F along the
the bit mechanism and adjustments.
Figure 4 is an enlarged section taken on the 'arm 21. The shaft 30 is rotatably positioned in
the arm 21. The driving-wheel 3| rigidly affixed
line 4-4 in Figure 2.
V
Figure 5 is a fragmentary view of one end of to one end of the shaft 36 serves to rotate the
the carriage showing the driving and locking pinion gear 29, which engageslthe rack32 set in
means.
the sleeve 28 and raises or lowers the said sleeve.
,
Figure 6 is an enlarged plan view of the seat.
Figure 7 is an enlarged view of the chuck and
bit with respect to the work.
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i The machine described has a bed plate I, upon
_ which are mounted a tool post 2 and four rail
posts 3, 4, 5 and 6 respectively. A guide rail 1, is
supported between the posts ligand 4 and a similar
2:) Cl guide rail 8 is supported between the posts 5 and
6. The rail 8 is parallel to the rail 7. A rack 'l'
is affixed to the rail 1 and similarly a rack 8’ is
af?xed to the rail 8 in such a manner as to allow
the teeth of the racks‘ to extend below the lower
40 surfaces of the respective rails. The carriage 9 is
The locking wheel 33 is engaged on the threaded
end of the shaft 34. Clockwise rotation of the
locking wheel 33 will distort the arm 27 at the slot
G to prevent movement of the sleeve 28. A
spindle 35 is rotatably mounted in the sleeve 28.
The upper extremity of the spindle has the con
nection 36, to- which may beattached a drive,
preferably the chuck of a dental drill. A chuck
31 is positioned at the lower end of the spindle
and arranged to hold a bit 38.
Figure 7 illustrates the use of a side cutting or
milling bit 38 as applied to the inlay at H.
The use of the machine herein described is 4 O
primarily that of making precision cuts in the
slideably mounted on the rails 1 and 8 as shown
at A and B. The guide rails Ill and I! are sup
form of slots or grooves in dental gold inlays,
ported in the endsv of the carriage and are paral
three-quarter gold crowns, full gold crowns, and
the like which have been previously ?tted to the
lel to each other.
The rails l0 and II are posi
teeth in the mouth of a patient, and transferred
8. The plane of the rails l0 and II is parallel to ' to a metal die or cast of the jaw constructed from I
an impression of said jaw. These inlays are
that of the rails '! and 8. The shaft I2, trun
nioned in the bearings l3 and I4 at each end of intended for attachments to abutment teeth to
~ tioned in a direction 90 degrees to the rails 1 and
support precision removable dental bridges. The
proper operation of removable bridges depends on
the precision of the cuts made in the abutment
' A pinion gear I‘! is mounted on the shaft [2 and "inlays. These cuts must be perpendicular to the
the carriage 9 has a driving wheel at one end and
adjacent thereto a locking wheel l6 which en
gages the threaded portion of the shaft l2 at C‘.
engages the rack 8'.
A similar gear l8 engages»
the rack ‘I’. Rotation of the driving wheel i5
55 moves the carriage on the rails l and 8. A clock
same plane and in many cases one vcut may re-.
quire another cut at exactly 90 degrees from the
?rst, This machine provides the movements
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2,132,503
necessary to prepare the required work in that the
seat must remain continuously in the same plane
and at times move in two de?nite directions at 90
degrees. The arrangement illustrated and de
scribed provides the means of movement with the
conservation of height. The seat is designed
preferably to accommodate an adjustable base as
illustrated, however I do not con?ne myself to
such a base speci?cally.
10
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In operation, the base is placed in the seat with
the work turned to the most convenient position.
The set screws 39 are rotated to clamp the said
base. The work is then positioned under the bit
38 by rotation of the Wheels l5 and 23. The bit
15 is raised or lowered by the wheel 3| and then
clamped in position by the locking wheel 33. If
the direction of the out is along the rails l0 and
II, the locking wheel [6 is rotated to clamp the,
carriage and the work is fed against the bit by
20 rotation of the wheel 23. If the direction of the
cut is along the rails ‘I and 8, the seat is clamped
by the rotation of the wheel 24 and the work is
fed against the bit by the rotation of the wheel Hi.
The machine herein described provides a de?
nite guide for the machining and milling required
in the preparation of removable dental bridges
and such modi?cations may be employed as lie
within the scope of the appended claim and what
I claim as new and desire to secure by Letters
Patent is;
A milling and parallelingmachine comprising a
carriage, a base and a seat, the said carriage slide
ably positioned on guides‘, the said guides sus- '
pended above the base on posts, the said seat 10
slideably positioned on a second set of guides, the
said second set of guides positioned on the car
riage at right angles to and’ below the ?rst set of
guides, racks affixed to the ?rstfset of guides,
pinions rotatably mounted on the carriage and in 15
engagement with the rack on the ?rst set of
guides, a second rack positioned on the carriage
and a pinion rotatably mounted on the seat and
in engagement with the said second rack, wheels
as means to drive the said pinions and other 20
wheels as means‘to lock the said pinions, a bit
rotatably mounted on the base and vertically
adjusted to the seat.
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EMMET E. WELCH. '
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