Improved Combined Dental Engine, Operating Table, and Grinding Apparatus.
Year: 1898

page_text: Date of Application, 14th July, 1898-Accepted, 17th Dec., 1898
COMPLETE SPECIFICATION.
Improved Combined Dental Engine, Operating Table, and Grinding
Apparatus.
I, JOHANNES MARTIN CARL GROTH, of No. 3, Wettin Platz Döbeln, Saxony,
in the German Empire, Dentist, 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:-
The present invention relates to a dental drill machine devised for use outside
the work-shop. This improved apparatus has attached to its frame all the neces-
sary tools and apparatuses, for instance it has attached to it the usual grinding
apparatus and also the operating table. In order to render the apparatus easily
transportable to the place of use, the frame thereof and also the foot is divisible
into several parts and the operating table can also be removed from the frame.
The table itself possesses a removable rim to prevent the instruments in use from
falling off.
Referring to the accompanying drawing.
Figure 1 is a view of a dental drill with the grinding apparatus and operating
table fixed thereon.
Figure 2 is a view from above of the detachable foot.
Figure 3 is a section on the line - of Figure 2.
Figures 4 and 5 illustrate the connection of the frame parts above and below
respectively.
Figures 6 and 7 shew, the method of fastening the glass plate placed upon the
table.
Figures 8 and 9 shew the attachment of the adjustable rim.
•
The frame of the dental drill consists as shewn in Figure 1 of the parts 1,
2 and 3. The part 1 contains the driving wheel for the flexible shaft, whilst
the part 3 is connected to the tripod. The two feet a¹ as of the said tripod are,
as shewn in Figure 2 rigidly connected together at the usual angle, whilst the
third foot a is detachably fixed to the other two. The connection between
these two feet-parts can be dove-tailed, or effected in any other suitable manner
as shewn in Figure 3. The foot a³ has at its hinder end a part a jointed to it,
which part serves as a support to a³ and can be adjusted to the right or the left
at a right angle. This part a' serves for the reception of the treadle b, which
is connected by means of a connecting rod c, with the main driving wheel d
through the crank f. The wheel d is supported near the foot a in the part 3
and is connected to the pulley h in the part 1 by means of a cord or strap g. Upon
the axle of the pulley h is placed a larger pulley which latter connects
by means of the strap or cord k with the driving wheel of the flexible shaft.
Upon the axle of the pulleys i and h are fixed the brushes and grinding discs
belonging to the grinding apparatus u. The connection of the parts 1, 2 and 3
together may be effected by screwing them together as shewn in Figure 4 and 5,
or by any other convenient manner and preferably so that upon the connecting
of the parts 1 and 2 the operating table is at the same time secured as clearly shewn
n Figure 4. This table m comprises a metal plate n covered with cloth or other

page_text: suitable material o. Upon this may be advantageously placed for the protection
of it against acids or the like, a glass plate p which as may be seen from Figure 7
is held firmly at one end by means of the clamp q. This clamp engages with
its ends g beneath the edges of the table m and is fixed in place by means of
the screws q2. Near the other end of the said table there are fixed eyelets r as
shewn in Figure 8 which serve to hold the bolts s fixed of the frame t. This
frame forms an attachment of the table and contributes to hold the glass plate p
fast at this end. The rim serves for the protection of the instruments not in
use and placed from time to time upon the table m and prevents them from falling
off. In order that the machine can be operated by the left foot as well as by
the right foot the treadle 6 is arranged interchangeably on the footpart a³ with
its connecting rod c; for this purpose the large wheel d also possesses a crank at
each side. If it be desired to take this machine to pieces for transport the
treadle b with its connecting rod c is disconnected from the crank f, the screw
which attaches the foot to the part 3 is unwound, the foot is taken away from
the said part 3 and separated into the two parts a¹² and a³, respectively. Then
the parts 12 and 3 of the frame are disconnected at the points y z and the
plate n is also removed so that the separate parts of the dental drill can be
packed together in a small a space as desired. When the drill is to be set up
the operation is reversed and the part at of the foot a³ is placed to the left or to
the right according as the driving is to be left or right as shown clearly in
Figures 1 and 2 in full and in dotted lines, respectively, and the treadle b is
secured with its connecting rode to the corresponding right or left crank f of
the large wheel d.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what
I claim is
1. The improved drill for dental purposes, characterized by having the oper-
ating table (m) and grinding and polishing apparatus (u) fixed to the frame of
the machine, said frame being divisible in a suitable manner into several parts,
such as 12 and 3, which parts on being connected together simultaneously secure
the operating table (m).
2. A dental drill such as set forth in Claim 1, characterized by having a
foot (a) formed of two or more connecting pieces (a¹ a² a³) which foot permits
by the adjustment of a attached portion thereof a, the treadle b being arranged
as a right hand or a left hand driving mechanism at will.
Dated 141 If T... 1000
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.