IMPROVEMENTS IN MORTISING MACHINES
Year: 1886

page_text: миргостолюш BROT WOOD
I, MAIER ROTHSCHILD, of Shamokin, in the county of Northumberland, Penn-
sylvania, United States of America, Merchant do hereby declare the nature of my
invention for IMPROVEMENTS IN MORTISING MACHINES 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 certain improvements in tools for boring square holes..
The peculiar construction, which constitutes my invention is pointed out in the
following specification and claims and illustrated in the accompanying drawing in
which
Fig. 1 represents a vertical section.
Fig. 2 is a sectional side view, the plane of section being indicated by the
line x, x, fig. 1.
Fig. 3 is a plan or top view.
Fig. 4 is a sectional view of the drill, the drillrod, and the guide for the drillrod,
on a larger scale than the previous figures.
Fig. 5 is a detail view of the clamp which I use for securing my boring tool to
the work.
Similar letters indicate corresponding parts.
In this drawing the letter A designates the base from which rise two
standards B B. These standards are connected at their top by a flanged plate C
and on this plate are mounted two jaws D D. These jaws swing on pivots a, a
figs. 1 and 3, and they are semi-cylindrical and provided with internal screw
threads intended to engage with the threads of the feed screw E. A knuckle
lever F serves to close up the jaws against the feed screw and the tails of the jaws
are exposed to the action of springs b, b, which have a tendency to throw the jaws
open. If the knuckle lever F is turned to the proper position the jaws are thrown
open by the springs b, b, and the feed screw is released.
In the faces of the standards B B are formed or firmly secured guides G G for
the moveable frame H. This frame forms the bearings for the driving shaft I, the
feed screw E, the drillrod J and the clearer K. In the lower end of the feed screw
is firmly mounted a bevel wheel L which gears into a bevel wheel M, mounted on.
the driving shaft I. The drillrod J is geared together with the driving shaft I by
bevel wheels N O, and the clearer K by bevel wheels P Q
From the bottom part of the frame H extends a tubular guide R through which
extends the drillrod and which is provided with ribs C, O, which engage with grooves
in a traverse T that is secured to the guides G G or to the standards B B. On the
guide R are mounted four circular saws S, S, which are secured to the outer
surfaces of bevel wheels U and which together with said bevel wheels turn freely
on the screw studs d. The drill rod J extends a short distance beyond the lower
edge of the guide R and it carries the masterwheel W and the bit X. The master-
wheel gears into the bevel wheels U, fig. 4, and if a revolving motion is imparted

page_text: to the drill rod, the saws S are caused to revolve by the action of the master-
wheel W upon the bevel wheels U.
On the driving shaft is mounted a cogwheel Y and on the side of the base A is
mounted a rackbar Z which swings on a pivot d and can be thrown in or out of
gear with the cogwheel Y by the action of a lever A¹. When the machine is in
operation, the jaws D D are closed and the rackbar Z is thrown out of gear with
the cogwheel Y as shown in dotted lines in fig. 2, but when a hole has been bored,
the rack bar is thrown in gear with the cogwheel Y, the jaws D D are opened and
by turning the driving shaft in the proper direction, the frame H, together with all
its appliances can be raised ready for the next hole.
The clearer K consists of a spiral wire which extends through the hollow drill
rod and when the tool is in operation, this clearer is turned in such a direction that
the chips are discharged at the upper end of the hollow drill rod. The base A can
be secured to the work by a suitable clamp such for instance as that shown in
fig. 5 in which A represents the base on which is firmly fastened a box a In this
box is secured a guide rod f, which carries two arms g, g. These arms are adjusted
on the rod f, by setscrews and one or both are provided with a clamping screw h.
By changing the number of saws, holes of different shape can be bored such as
hexagonal, octagonal, etc, and by changing the form of the bit, my machine can be
adapted for boring holes in minerals.
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. The combination of a supporting main frame, a frame moveable back and
forth thereon and a driving shaft carried by said moveable frame, with a drill rod
geared to the driving shaft, a guide for the drill rod, the saws mounted on the sides
of the guide, the cogwheels connected to the saws and the master wheel and bit
secured to the outer end of the drill rod in advance of the cogwheels on the saws
substantially as described.
2. The combination, substantially as herein before described, of the hollow drill
rod, the clearer extending through the drill rod, the driving shaft geared together
with the clearer and with the drillrod, the guide for the drill rod, the saws mounted
on the sides of this guide, the cogwheels connected to the saws and the masterwheel
and bit secured to the drill rod.
3. The combination, substantially as hereinbefore described, of the moveable
frame, the feed screw connected to this frame, the rotary drillrod mounted in said
frame, the guide for the drillrod firmly connected to the frame, the saws mounted
on the sides of the guide, the cogwheels connected to the saws, the masterwheel and
bit secured to the drillrod, and the driving shaft mounted in the moveable frame,
and geared together with the drill rod and with the feed screw.
4. The combination, substantially as hereinbefore described, of the moveable
frame, the feed screw connected to this frame, the rotary hollow drillrod mounted
in said frame, the guide for the drillrod firmly connected to the frame, the saws
mounted on the sides of the guide, the cog wheels connected to the saws, the master-
wheel and bit secured to the drillrod, the clearer extending through the drillrod
and the driving shaft mounted in the moveable frame and geared together with the
drillrod, the feed screw, and the clearer.