Portable Machine for Boring and Tapping.
Year: 1897

page_text: Date of Application, 9th Dec., 1897-Accepted, 9th Dec., 1898
Portable Machine for Boring and Tapping.
I, MARTIN HÖHN, of Centralwerkstätte, Munich, Kingdom of Bavaria, Germany,
Engineer, 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 a portable machine for boring and tapping operated
by means of an electric motor arranged thereon or by means of any suitable power
transmission device. The actuating mechanism of the tool of my improved machine
is adapted to be rotated in a horizontal and a vertical plane and to be moved up
and down on the support thereof in order to allow the tool to be brought to the
desired point.
The improvements consist in the construction, arrangement and combination of
parts more fully and clearly pointed out and claimed hereinafter and illustrated
in the explanatory drawings hereunto appended and in which,
Fig. 1 is a side elevation of the machine embodying my invention.
Fig. 2 is a front elevation of same.
Fig. 3 is n detail sectional view of the feeding mechanism of the annular support
hereinafter referred to, and showing the manner of clamping the same in position.
Figs. 4 and 5 are other detail views of said feeding mechanism.
Fig. 6 is a broken horizontal sectional view of the machine.
Fig. 7 is a sectional view on line p q of Fig. 6.
Fig. 8 is a plan view of the box E showing the feeding mechanism of the tool.
Fig. 8 is a cross sectional view of the parts of said mechanism, and
Fig. 9 shows the tool carrier for tapping.
In the drawings, like letters refer to similar parts throughout all the figures.
The improved machine tool is composed of a wheeled carriage W upon which
is movably secured a hollow standard S supporting the boring and tapping mech-
anism proper and the lower end of which is adapted to slide in suitable ways
provided on the carriage W. The standard S carries a vertical shaft A, suitably
journaled therein and having a spur-pinion a at its lower end meshing with rack-
teeth formed on the carriage. About its central part said shaft A carries a notched
ring-plate brigidly secured thereto and the notches of which are engaged by
a lug formed on a lever H pivoted on a sleeve H¹ loosely mounted on said shaft.
(Figs. 1 and 2).
By rotating said lever H, after the lug thereof has engaged the notches of
plate b, the pinion a will mesh with the above mentioned rack-teeth on carriage W
whereby the standard and the parts supported by the same will be fed along the
ways on carriage W.
An annular ring-support, loosely mounted on standard 8 is adapted to be moved
upwards and downwards on said standard, carrying with it the boring and tapping
mechanism proper movably secured thereto. For this purpose, said annular ring-
support R has a shaft a journaled in suitable bearings on said support and having
an endless screw engaging a gear-wheel C, the axle C of which carries a toothed
pinion C meshing with rack G secured to standard S (Figs. 2, 3, 4 and 5). The
support R is held in adjusted position by means of a set-screw . (Fig. 1).
In order to facilitate upward movement of said support R, the latter may he

page_text: attached to a belt or a chain extending over a pulley c, journaled in bearings
provided on the top of standard S, the other end of said belt or chain having a
balance-weight W moving within standard S.
As afore stated, the ring-support R carries the mechanism of the machine and
the electric motor for said mechanism, both mounted on the frame E, movably
secured to support R, that is, the frame E is adapted to rotate in a horizontal plane
on said support R, after looseuing the clamping screw O secured to support 1 and
loosely extending through a circular slot Os made in the horizontally projecting
flange E' of framo E, said slot 02 confining the rotation of the frame in a horizontul
plane. As will be seen in Fig. 3, the frame E is held in adjusted position by
clamping screw 0. The frame E is furthermore movable along standard S, since
it is carried by support R as already stated.
For holding frame E on ring R, independently of the clamps for adjustment, said
frame may be made in two flanged parts, clamped together and on ring R by
means of tightening-bolts (Figs. 3, 4 and 5).
The mechanism proper comprises the electric motor indicated by reference letter
D in the accompanying drawings and mounted on said frame E, "the shaft of said
motor being geared with a transmission shuft % by means of toothed wheels K K'.
Said shaft has a suitable clutch device indicated by reference letter 7, and
carries an endless screw I (Figs. 2 and 8) engaging a wheel J on the drill-shaft
of the machine, said wheel J being held in an elongated key-way on said drill
shaft, so that the latter might be fed as hereinafter described.
The endless screw I and wheel J are lodged in a substantial rectangular box E
provided with two sockets & and d through which extends the drill-shaft B of the
machine. The box E is movably held on a carrier T projecting from frame E,
said carrier having a hollow stud or pivot L, about which said box and there-
fore the drill shaft of the machine may be moved into the desired position as
indicated by dotted lines in Fig. 1; the box E is held in adjusted position by the
clamping screw (1 secured to the wall of said box and loosely extending through
a circular slot 03 in the carrier T. The box is movably secured to said carrier
by means of two diametrically opposite screws a¹ and as said box is moved about
stud L³, said screws and heads thereof slide in a circular groove P in the wall of
box E (Fig. 6 and 7).
Shaft extends through stud L which serves as a bearing for said shaft.
The rear end of drill shaft B is loosely connected with the end of a hollowed
rod supported by socket and extending into the hollow end of drill-shaft B.
The hollowed rod i is externally screw-threaded and fed by the intermediary of a
toothed part engaging said rod and operated by means of a wheel and
endless screw m actuated by a hand-wheel L¹. (Figs. 1, 8 and 8*).
The end of hollowed rod i is provided with a cap h, the position of which can be
regulated upon the end of said rod by means of a screw g.
To
To feed drill-shaft B said hollowed rod is moved forwards by actuating the
toothed part made one with rod and handlen said rod t carries a loose wheel,
one half of the face of which forming a worm gear-wheel the second half of said
face being plain and separated from the former by a circular groove. This plain
part is intended to stop the opening of box 1. The wheel is actuated by the
endless screw m on hand-wher! L' (Fig. 8) and may be readily thrown into and out
of engagement with toothed part k, by moving hand-wheel L, loosely mounted on
rod aud secured to wheel 1, forward or backward respectively.
this end the inner side of wheel 1 and the opposite side of part
may be provided with suitable teeth and notches, or other suitable
coupling means, whereby said two parts may be readily connected and dis-
connected for feeding drill-shaft B as whech L' is actuated, and for quickly
returning said shaft to its starting point by actuating handle or hand-wheel n.
Drill-shaft B is mounted on the extremity of rod i in such a way as to enable
the simultaneous endwise movement of both organs and the rotary movement of
drill-shaft alone.

page_text: g
Screw 9 is screwed in rod i and has screwed upon itself cap h, intended to stop
the forward motion of rod i. Screw is provided at its extremity with a nut g¹.
The nave of hand-wheel L as well as the corresponding part of wheel / are screw-
threaded so as to occupy several relative positions to each other.
The afore-mentioned clutch-device % of transmission shaft % may be omitted in
case the machine is directly actuated by an electric motor mounted on frame E.
When the machine is used for cutting and tapping, the drill shaft B is provided
with a yoke-like carrier as shown in Fig. 5.
The machine may be secured in place, if required, by means of threaded rods g'
the lower ends of which have set-plates 8 and the threads of said rods engaging inner
threads of sockets secured to carriage W. The machine is furthermore held
against lateral movement by a brace M having a yoke end and loosely extending
sockets Q and Q', socket Q being pivotally held on an arm N pivotted on carriage W
and socket Q' being pivoted on standard S, the brace M is held in adjusted position
in said sockets Q and Q¹ by suitable set-screws. This arrangement allows said
brace to be placed, against standard S when the machine is to be removed and
not in use.
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:
1. In a boring and tapping machine the combination with a wheeled carriage,
and a standard movably mounted thereon, of the boring and tapping mechanism
proper adjustably mounted on said standard, substantially as described and shown.
2. In a portable boring and tapping machine the combination with a movable
supporting standard, of a ring-support movably mounted on said standard and
carrying the mechanism proper of the machine, said ring-support being geared
with a rack provided on said standard for adjusting said support in a vertical
plane, substantially as set forth.
3. In a portable boring and tapping machine, the mechanism proper comprising
an electric motor, a suitable transmission shaft having an endless screw, meshing
with a corresponding wheel, slidably secured on the drill-shaft of the mechanism,
means for adjusting said drill-shaft in vertical and horizontal planes and for giving
the same any desired inclination, and means for feeding said drill-shaft during the
operation, substantially as set forth.
4. In a boring and tapping machine the combination with a revoluble frame E,
a power transmission shaft Z and an endless screw on said shaft, of a worm wheel
slidably secured on the drill-shaft of the machine, a box E movably secured to a
plate or carrier T of frame E, a stud or pivot, on said carrier, about which said
box may be turned and a clamping screw secured to said box and moving in a
circular slot on said plate or carrier T to secure said box in adjusted position,
substantially as described and shewn,
5. In a portable boring and tapping machine in combination a horizontally
movable standard, a vertically movable support on said standard, a revoluble frame
supporting the boring and tapping mechanism on said support, and means for
giving the drill shaft any desired inclined position, substantially as described.
6. In a boring and tapping machino the feed of the drill shaft, substantially as
described and shown.
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