IMPROVEMENTS IN MILLING MACHINES
Year: 1884

page_text: I JOHN CLAYTON MEWBURN of 169 Fleet Street in the City of London Fellow
of the Institute of Patent Agents do hereby declare the nature of my invention
for "IMPROVEMENTS IN MILLING MACHINES" to be as follows:-
The object of this invention is to construct a milling machine which can be set to
work at any angle between the vertical and the horizontal position by means of a
graduated sector.
The improved machine is chiefly characterized :—
1st By the combination of the head of the machine with a movable shaft carrier
carrying toothed wheels and pulleys by the aid of which motion is communicated
to the machine.
2nd By a rack arrangement within the frame or standard of the machine whereby
belts of any length can be tightened without shortening them.
3rd By an arrangement for transmitting to the table an automatic movement in
either direction in whatever position it may be.
The frame or standard of the machine is terminated at its upper end by a sector
in which a groove is formed. The tool carrier is fixed by a nut to the lower part
of the sector and by another nut to the upper part of the sector; the latter nut is in
the groove above named. When it is wished to move the tool to any given angle
it suffices to slack the upper nut and to turn the tool carrier on the lower nut
which serves as its axis and to place it at the required angle and then to tighten
up the upper nut. To the tool carrier is fixed a movable forked head terminated
at the front by a tenon; this tenon is traversed vertically by a bolt which by
means of a ring carries a movable shaft. This movable shaft serves as the axis to
2 toothed wheels gearing with 2 other wheels on the spindle of the tool; this spindle
carries & pulley which transmits motion to the machine.
The 2 arms of the fork of the movable head carry 2 pulleys over which the belt
passes before reaching the pulley previously named. Two other pulleys are con-
nected to a rack situated within the frame or standard of the machine; the rack
gears with a toothed wheel whose spindle carries externally a small ratchet wheel
into which a paul takes. By means of a handle the toothed wheel can be turned
Prins di

page_text: and according to the length of the belt the rack is made to rise or to descend and
with it the pulleys which it carries. In this way belts of any size can be employed
without its being necessary to cut them in order to shorten them.
On the side of the carriage which carries the table of the machine is fixed a rod
carrying externally 2 small pinions and a sleeve in which latter is fixed a pin 5
terminated by a small lever. When the lever is at the bottom of a notch in the
socket the pin enters the rod and fixes it. When on the contrary the lever is
turned to the right or left the pin leaves the rod which is therefore moved by the
pinions because these gear with another pinion fixed on another rod which is
connected to the central driving shaft of the machine and is actuated by it. The 1
first named rod by means of an endless screw and pinions communicates a forward
or backward movement to the table in whatever position it may be.

page_text: I JOHN CLAYTON MEWBURN, of 169 Fleet Street, in the City of London, Fellow
of the Institute of Patent Agents do hereby declare the nature of my invention
for IMPROVEMENTS IN MILLING MACHINES," and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement:―
The object of this invention is to construct a milling machine which can be set
to work at any angle between the vertical and the horizontal position by means of
a graduated sector.
The improved machine is chiefly characterized :—
1st By the combination of the bead of the machine with a movable shaft carrier
carrying toothed wheels and pulleys by the aid of which motion is communicated
to the machine.
2nd By a rack arrangement within the frame or standard of the machine whereby
belts of any length can be tightened without shortening them.
3rd By an arrangement for transmitting to the table an automatic movement
in either direction in whatever position it may be.
Figure 1 of the annexed drawings is an elevation, partly sectional, of the improved
milling machine. Figures 2 and 3 represent the sector on a larger scale and show
the method of attaching the tool carrier and several of the positions which it can
be made to occupy. Figure 4 is a side view of the arrangement for giving an
automatic movement to the table. Figure 5 is a front view, on a larger scale, of
this arrangement. Figures 6 and 7 represent respectively in elevation and plan
the arrangement of the movable head which carries the toothed wheels and
pulleys.
The frame or standard a of the machine is terminated at its upper end by a
sector 6 in which a groove c is formed. The tool carrier d is fixed by a nut f to the
lower part of the sector and by another nut g to the upper part of the sector; the
latter nut is in the groove c.
When it is wished to move the tool to any given
angle it suffices to slack the nut g and to turn the tool carrier on the nut ƒ which
serves as its axis and to place it at the required angle and then to tighten up the
nut g. To the tool carrier d is fixed a movable forked head h terminated at the
front by a tenon or projecting piece i; this tenon is traversed vertically by a bolt
which by means of a ring carries a movable shaft j. This movable shaft serves as
the axis to two toothed wheels k, gearing with two other wheels m, n on the
spindle of the tool; this spindle carries a pulley p which transmite motion to the
machine.
The two arms of the fork of the movable head h carry two pulleys o, o over
which the belt passes before reaching the pulley p. Two other pulleys q are
connected to a rack 7 situated within the frame or standard of the machine; this
rack gears with a toothed wheel a whose spindle carries externally a small ratchet
wheel t into which a paul u takes. By means of a handle the toothed wheel a can
be turned and according to the length of the belt the rack r is made to rise or to
descend and with it the pulleys q which it carries. In this way belts of any
size can be employed without its being necessary to cut them in order to shorten
them,
On the side of the carriage which carries the table a of the machine is fixed a
rod a carrying externally two small pinions y, y-and a sleeve z in which latter is
fixed a pin terminated by a small lever '. When the lever is at the bottom of a

page_text: notch y¹ the pin enters the rod x¹ and fixes it. When on the contrary the lever 2¹
is turned to the right or left the pin leaves the rod which is therefore moved by the
pinions y because these gear with another pinion 7¹ fixed on another rod A which
is connected to the central driving shaft B of the machine and is actuated by it.
The rod by means of an endless screw C and pinions D, F communicates a
forward or backward movement to the table x in whatever position it may be.
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 :-
Constructing milling machines substantially as herein before described and
represented in the annexed drawings.