Year: 1897

page_text: I, AUGUST ULLRICH, Merchant, of Kempten (Bavaria), do hereby declare the
nature of this invention to be as follows:-
This invention relates to an improved boring knife for boring cylindrical and
conical bores.
This device consists of a piece of figured steel which has at both ends a cut
out hollow flute. For producing the lateral cutting edge the steel is filed a little
obliquely. Besides the said cutting edge there is also provided an end cutting
edge. This steel can be fastened transversely in a holder or boring rod by means
of a pressure screw or fixed in any other convenient manner.
It is essential for obtaining a proper cut to choose a suitable radius for the flute
Accordingly as the same is more flat or more curved, the boring knife will be
usable for harder or softer materials. The adjusting angle is also to be made
greater or smaller according to the material to be worked.
The knife lies transversely in the bore hole. The side cutting edges cut away
the face of the material whilst the end cutting edges give the finishing of the bore
hole surface. The side edge may be made oblique towards the centre, the knife
guides itself in the radius of the bore. It is thus impossible for the steel to catch
or tear. Since the bore is simultaneously cut and smoothed by means of this
knife, the work is effected in a considerably quicker manner. Also the shape of
the steel can be produced, without forging, such forging and consequent heating
deleterious in the production of a cutting tool, every expert knows.
In order to adjust the boring tool for a certain diameter and also obtain a
convenient fixing of the tool, there is provided the following arrangement.
In two or more radial guides in the boring shaft there are adjustable the cutting
knives which are provided on their shanks with grooves forming parts of a spiral
running round the boring shaft. Into the grooves of the knives there reach the
spiral worm threads of a ring seated loosely on the boring shaft. According to
the direction of revolution of the same the knives are caused to move equally from
or towards the centre.
In order to be able to fix conveniently the ring easily movable on the shaft and
simultaneously the knives, a nut is screwed on the screw of the boring shaft. By
screwing up the same the ring and the knives are fixed. A counter nut can also
be used, in order that the aforesaid nut cannot loosen automatically. In this
arrangement there can be used boring knives of any kind.
In order to give the boring knives a stronger hold on the boring heads in
boring devices on larger dimensions and to allow an entirely exact adjustment of the
knife edges both as regards the bore direction and also the diameter of the bore
hole, it is recommendable not to fix the knives directly, but to insert them into
corresponding casings.
These casings are fixed in a similar manner in the head, as the knives before
described, that is to say by means of a spirally grooved ring with counter nut.

page_text: The casings are, like the knives, provided on the corresponding longitudinal
side with part spiral teeth, so that they can be displaced simultaneously in radial
direction by turning the ring provided with spiral worm threads.
The knives are made, adjustable in the casings. In order to allow this, on each
casing there is provided in the bore direction a screw bolt, the two heads of
which reach on both sides over the knife; the casing in this direction is a little
wider than the knife is broad, so that the knife can be displaced a little.
The adjustment of the knife in this direction is effected by turning the bolt,
whereby the two screw heads take the knife between them and hold it fast after
the adjustment.
For the purpose of adjusting the knife in radial direction, a second screw bolt
is seated longitudinally in the casing, this screw bolt reaching with a hook under
the inner end of the knife. By screwing on the screw nut on the front side of the
casing, this hook pulls the knife correspondingly outwards.
In this manner the adjustment of the knife edges can be regulated.
Instead of one bolt with two heads the adjustment of the knives in the bore
direction can also be effected, by means of a worm engaging with teeth in the
knife.
Dated this 10th day of November 1897.
HERBERT HADDAN & Co.,
Agents to Applicant,
18, Buckingham Street, Strand, London.
I, AUGUST ULLRICII, Merchant, of Kempton, (Bavaria), 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:-
This invention relates to an improved boring tool:-
In the annexed drawing Fig. 1 shows a front view and Fig. 2 a side view of a
form of construction of the new boring tool; the latter figure is shown in the
direction of the arrow (Fig. 1). Figs. 3 and 4 show two other forms of construc-
tions of the same.
The knife consists of a piece of steel a, which has a cut out hollow or flute b,
the one edge of which is shaped a little obliquely for the purpose of forming a
lateral cutting edge e (Fig. 1). Besides this cutting edge c there is provided
a second cutting edge, which is formed by the end d of the hollow or flute b. The
thus formed knife can be arranged singly or otherwise on an appropriately con-
structed holder, which is such, that the knives can be adjusted laterally.
The knife works in the manner shown in Figs. 5 and 6 and cuts simultaneously
at e and d, when moved in the direction of the arrow (Fig. 5). The cutting edge c
takes the chip, whilst the edge d effects the smoothing of the cylindrical bored
surface. The leading face of the bar may be either squarely sloped off leaving
a shoulder as at el Fig. 2 or chamfered as at e¹ Fig. 6, namely at the end rear-
ward of the cutting edge c as also shown in Figs. 1 and 3.
According to the radius of the flutes being larger or smaller the boring knife
will be applicable for harder or softer materials and according to the material to
be worked the angle e of the edge c is correspondingly greater or smaller.
Fig. 3 shows a form of construction of the boring knife, in which the radius of
the flute is greater and the said angle smaller than in Fig. 1. By means of a

page_text: corresponding oblique position of the knives in the boring devices and heads the
angle e can be varied.
As shown in the form of construction Fig. 5 the piece a can also be formed
with a knife of the described manner at each end, the cutting edges are here
arranged alternately to one another. When using this boring knife it is fixed on
a steel holder on rod i by means of a pressure screw or in any other convenient
manner. In the single as in the double boring knife the cutting edge c can be
oblique as in Fig. 4.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. An improved boring tool having a cutting edge c arranged laterally on the
knife steel and an edge d arranged on the end thereof, whereby the cutting
edge c takes the chip and the edge d effects the finishing off and gives to the
knife in the bore the necessary guiding.
2. A form of construction of the boring tool as in Claim 1, in which two knives
as herein described are arranged on the knife steel in a manner alternately to
one another.
Dated the h 1
PT 1
1000