Improvements in Slot Drilling Machines.
Year: 1898

page_text: Date of Application, 25th Nov., 1898-Accepted, 18th Feb., 1899
COMPLETE SPECIFICATION.
[Improvements in Slot Drilling Machines.
I, CAMILLE JANSSEN, Engineer and Managing Director of the Société-anonyme
de Constructions-mécaniques de Longdoz, 115, Quai Orban, Liége, in the Kingdom
of Belgium, de 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 has for its object, an automatic machine for drilling
slots at a single operation, and which, by a disengagement, is equally able to
bore round holes.
The said machine is represented in the annexed drawings, Figure I by an
elevation, Figure II by a plan, Figure III by a section upon the dotted line a,
b, c, d, Figure I and in Figure IV by an end view.
Figure 5 shows diagramatically and upon an enlarged scale, the relation
between the two arms of the lever which controls the to and fro movement of
the carrier slide.
The machine comprises a base A, Figure 1, supporting two carrier slides B,
which are capable of a to and fro movement as hereinafter described. Each of
these carriers is provided with a drill head-stock C, which is fixed in a deter-
minate position according to the position of the slot to be bored. Each of these
head stocks is rotated either by straps and pullies or by any other known means
which will also permit of the to and fro movement of the carriers B. In the
arrangement represented in Figures 1 and 2, it is the shafts D which receive
this rotatory movement. These axles D), are grooved and have their axes dis-
posed parallel to the to and fro movement and are capable of sliding longitudinally
through the pullies which latter do not admit of relative movement. These
shafts communicate their rotatory movement to the drill-carrying shafts E by
means of bevel wheels or any other known means. The to and fro movement
of the carriers B, and the penetration of the drill carrier shafts are controlled
by the rotation by shafts M, Figure 1, one for each head stock and the rotation
of this said shaft M is communicated by means of any mechanical means, either
from the power of the shop, or from one of the shafts D.
In the arrangement shown by the Figures 1, 2 and 4, on one of the shafts D,
is found a pulley which communicates the movement to the shaft G, by bands
and pulleys F. The shaft G, transmits its movement to a longitudinal shaft L,
Figure 1, by means of the worm H, keyed on G, and the worm wheel J, keyed
on L. The movement of L is transmitted to M by means of the toothed wheels f
and g. The to and fro movement of each carrier B is obtained by means of a
sliding stud 0 Figures 1 and III, fixed in the groove of the crank plate N
(which is made fast with the toothed wheel g) of the axle M; this sliding stud 0,
by its rotation about the axis of M, gives a rocking movement to the slotted
lever P, connected to the carrier B, by its upper part and by means of a pair
of connecting rods Q. By reason of the difference in the relative length of the
two arms of the lever P, (see Figure 5 for an enlarged diagram) the effort of

page_text: the slide stud O, is considerably reduced and the extent of the to and fro move-
ment or throw of the carrier may be regulated with great ease and exactitude by
varying the excentricity of the stud 0.
The shaft. M also carries a channel cam wheel R, acting upon a ratchet wheel S,
by means of the known system of levers represented by the Figures 1 and IV, or
by any other known arrangement. The cams are timed so as to act at the two
extremities of the to and fro movement, and whereas the crank plate describes
a certain angle (Figure 5), the corresponding movement of the carrier b, is but
slight by reason of the tangential position of the lever P, relative to the circum-
ference described by the sliding stud 0. The ratchet wheel S, provides one
means for controlling the penetration of the drill shaft. E, by acting on its
advancing screw T, Figures I, II and IV by means of a system of toothed
wheels T, which are so arranged as to transmit the intermittently rotating move-
ment of the ratchet wheel S, to the drill shaft without interfering with the to
and fro traverse of the carrier slide. For this purpose, it is sufficient that the
shaft, Figures I and IV should be grooved and that the bevel wheel v, fixed to
and moving with the head stock, should be free to slide upon the said shaft on
traversing to and fro with the slide. The cam wheels R, thus act on the drill
carrier shafts to give them the necessary penetrating movement through the
medium of mechanical means, either such as represented in Figures I II and IV,
or by other suitable means.
The drilling head stocks are of the ordinary construction, but are provided
with an alternative or supplemental form of automatic drill-penetration governor
adapted to be thrown into operative connection with the traversing screw of the
drill shaft at such times when the carrier slide is stationary relative to the frame,
as it is when drilling round holes. This governor is marked W, on Figures I
and III and consists of an excentric rotating with the drill shaft and encircled
by a strap W, the arm W2, of which with the pawl lever Y', of a ratchet wheel Y,
made fast with an intermediate shaft Z, the arrangement being such that the
continuous rotation of the drill shaft rocks the pawl lever and intermittently
rotates the ratchet wheel Y and through it, the shaft Z, which is adapted to be
coupled by a clutch such as X, with the spindle Z', of one of the spur wheels T¹,
operating on the feed screw T. When the shaft Z is thrown out of connection
with the penetration governor W by taking the pawl out of engagement with
the ratchet wheel, the drill may be rapidly withdrawn by rotating the coupled
shaft Zand spindle Z and the feed wheels T¹, in the opposite direction to that
of feeding by means of the hand cranks M².
It will thus be understood that if it is required to drill round holes no move-
ment is communicated to the shaft M', and the carrier is held stationary. The
drill feed is, in this case, performed by connecting the governor W, with the
feed wheels T, by throwing in the clutch X, but if on the other hand, the
machine is required to drill slots, the clutch .r, may be thrown out of gear, and
the carrier slide made to traverse to and fro by the means described, with the
penetration of the drill being governed by the ratchet S and intermittently
rotating shaft u, whose movement is communicated to the spindle 7, and feed
spur wheels T¹, by means of the bevel wheels v. Thus when the penetration is
continuous, it is controlled by the governor W and ratchet wheel Y, whereas
when penetration occurs at the two ends of the stroke or throw as in slot drilling,
then it is governed by the cam wheel R and ratchet S, whilst the extent of the
said throw may be varied by the form given to the said cam wheels. It is also
understood that if it is actuated by cam wheels, the ratchet gear Y, must be
disengaged, and the ratchet gear of S, engaged. This machine thus presents a
numerous advantages, of which the principal are the following:-First, it auto-
matically drills slots in a single operation; secondly, the length of the slot is
easily determined since it is only necessary to alter the excentricity of the slide
stud 0, whereby, in consequence of the difference in the length of the two arms
of the lever P, this adjustment is arrived at with great exactitude; thirdly, by

page_text: reason of the employment of cam wheels R, a penetrating movement is given
to the drill carrying shafts at the two ends of the stroke; also that, for a certain
angle described by the crank-plate N, the stud 0, imparts only a slight movement
or displacement to the carrier slides B; fourthly, either round holes or slots may
be bored at will, either with continuous penetration or with penetration at the
two extremities of the stroke; fifthly, this machine may be simple, or double or
(when more than two headstocks are mounted on one frame) multiple, and the
boring of round holes or the drilling of slots is made by each head stock of
one part independent of the others. The length of the holes may also be
different from one another.
By reason of the various advantages, the machine is applicable to numerous
uses, and one of the most important is the drilling of slots in the ends of rails
for the passage of the bolts. The machine represented by Figures I, II, III
and IV is designed for this work.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
First: In machines for drilling slots at a single operation, the employment
of a crank plate N, with excentrically disposed sliding stud 0, which, on turning,
gives a to and fro movement to a carrier slide B, through the medium of a slotted
lever P, connected to the said carrier by couplings such as Q, said to and fro
movement being regulated by the adjustment of the stud O, in the groove of the
crank plate N.
Secondly: In a machine for drilling slots at a single operation, the employ-
ment of cam wheels R, which control the penetration of the drill at the two
extremities of the stroke of the carrier slide B, which has but a slight movement
by the intervention of levers acting on a ratchet toothed wheel S, whose move-
ments are communicated by known mechanical means, to the screw T, which
gives the tool carrier shaft E, the penetration movement.
Thirdly: The employment with the arrangements claimed under first and
second claims, of the combination of parts permitting equally of the boring of
round holes or of slots, with continuous penetration, that is to say, with penetra-
tion governed by the rotation of the drill-carrying shafts by means of known
mechanism and by the means of an engaging and disengaging clutch a.
Fourthly: In double or multiple drilling machine of the type referred to
in the first and second claims, the combination with each of the drill head stocks,
of means for controlling the rotation, the to and fro movement & the penetration
of its drill, independent of the other head-stocks, whereby the simultaneous boring
or drilling of varying holes or slots by the respective drills is permitted, sub-
stantially as described and set forth.
Dated this 24th day of November 1898.
CAMILLE JANSSEN.
By Henry Skerrett,
24, Temple Row, Birmingham,
Agent for Applicant.