IMPROVEMENTS IN SLOTTING AND PLANING MACHINES
Year: 1880

page_text: LETTERS PATENT to Joseph Barrow and John Craven, both of Leeds, in the
County of York, Engineers, for an Invention of "IMPROVEMENTS IN SLOTTING
AND PLANING MACHINES."
PROVISIONAL SPECIFICATION left by the said Joseph Barrow and John
Craven at the Office of the Commissioners of Patents on the 19th June 1880.
JOSEPH BARROW and JOHN CRAVEN, both of Leeds, in the County of York,
Engineers. "IMPROVEMENTS IN SLOTTING AND PLANING MACHINES."
Our Invention has reference to the class of slotting and planing machines for
heavy work, in which the cutting tool is made to travel both vertically and
horizontally, the tool slotting vertically with a horizontal feed, and planing
horizontally with a vertical feed; and our Invention is designed to secure a much
larger amount of feed than is obtained by the usual mode in which the surplus
momentum of the tool-holder is employed to put on the feed, and which is
necessarily limited.
Now according to our Invention we cause a clutch, actuated or driven by the
strap power, to impart motion to the feeding slide whether planing or slotting is
being done, and such clutch to be thrown out of gear by a cam or tappet when the
requisite feed is attained, so that such feed may be wholly independent of any
surplus momentum. By our Invention we are enabled to obtain a feed of
considerable width (it may be, for instance, two inches or more).

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Barrow and John Craven in the Great Scal Patent Office on
tho 18th December 1880.
JOSEPH BARROW and JOHN CRAVEN, both of Leeds, in the County of York,
Engineers. "IMPROVEMENTS IN SLOTTING AND PLANING MACHINES."
Our Invention has reference to the class of slotting and planing machines for
heavy work, in which the cutting tool is made to travel both vertically and
horizontally, the tool slotting vertically with a horizontal feed, and planing
horizontally with a vertical feed; and our Invention is designed to secure a much
larger amount of feed than is obtained by the usual mode in which the surplus 1
momentum of the tool holder is employed to put on the feed, and which is
necessarily limited.
Now according to our Invention we cause a clutch, actuated or driven by the
strap power, to impart motion to the feeding slide whether planing or slotting is
being done, and such clutch to be thrown out of gear by a cam or tappet when the 1
requisite feed is attained, so that such feed may be wholly independent of any
surplus momentum. By our Invention we are enabled to obtain a feed of
considerable width (it may be, for instance, two inches or more).
Referring to the accompanying Sheet of Drawings:-
Figs. 1 and 2 are respectively a front elevation of a portion of and an end 2
elevation of a slotting and planing machine constructed in accordance with this
Invention.
Fig. 3 is a plan.
Figs. 4, 5, and 6 are similar views to Figs. 1, 2, and 3, and illustrate another
method of carrying out our Invention.
5
2
In Figs. 1, 2, and 3, a, a, are the driving pulleys which give motion to the
spur-wheel b in either direction by the intermediate pinions c, d. Either of the
pinions may be geared into the spur-wheel b by turning the plate a¹ which carries
them on the centre or axis a². The spur wheel b is loose on the shaft e which
operates the feed motion, but may be firmly connected (so as to rotate with it) to 3
it by means of the clutch f operated by the lever g; h is a vertical shaft on which
is fixed the cam i, which on making one revolution comes in contact with the
bowlj fixed on the lever g and throws the clutch fout of gear, the desired feed
having then been effected. The cam i is provided with a key-way broader than its
key, so that it may be pushed forward by hand over the bowl in readiness for the 3
renewal of the feed.
As soon as the tool has commenced to move in the direction of the cut,
whether planing or slotting, the attendant connects the spur wheel b to the
shafte by means of the clutch f, and thereupon the tool proceeds in the direction
of the feed to be accomplished simultaneously with the cutting movement.
In Figs. 4, 5, and 6, the machine is driven by the pulleys a, a; theso pulleys
actuate a spur pinion 1 which may be made to engage in the spur wheel 2 or spur
wheel 3, according as a slotting or planing notion is required. When the pinion 1
is put in gear with the spur wheel 2 for a slotting motion the pinion 4 is put in
gear with the spur wheel 3 to convey the necessary motion from the clutch
wheel 18 to the vertical shaft 5 for the horizontal feed, and vice versa. The spur
wheel 2 gives motion to the horizontal shaft 3a and vertical screw 4ª for the
slotting motion, and the wheel 3 through vertical shaft 5, bevil wheels 6 and 7, and
horizontal screws 8 and 9 for the planing motion.
On the driving shaft 10 is a clutch 11 which by means of the clutch lever 12 5
may be connected with the pinion 13, and through it with either one or both of
the intermediate pinions 14 and 15, thus giving motion to the spur wheel 16 which

page_text: is fixed on the shaft 17. At the commencement of the planing stroke this clutch is
put in gear by the attendant, and thereupon motion is given to the spar wheel 16
which in its turn communicates motion to the disc 18 by means of three
pins 20, 20, 20, fixed in the side of the spur wheel 16, and moving freely in three
curved slots formed in that disc.
When the three pins 20, 20, 20, have moved through the whole length of the
slots they carry round tho disc 18 until the tappet 19 throws the clutch 11 out of
gear, the desired broad feed baving then been effected. The disc is then moved
forward by the attendant until the tappet is clear of the clutch, which is then
ready to be again put in gear for the next renewal of the feed.
It is clear that the maximum feed to be obtained is limited by the revolution
of the disc, minus the movement which is necessary to pass the disc beyond the
clutch in readiness for the next feed, and that a less feed may be readily obtained
by further rotating the disc through the slots, and thereby reducing the action
of the spur wheel 16, the pins (20, 20, 20,) of which must move through the slots
in the disc before they give any motion to it.
Having described the nature of our said Invention, and explained in what
manner it is to be or may be performed or carried into practical effect, we would
have it understood that what we consider to be novel and original, and therefore
claim as secured to us under the Letters Patent bereinbofore in part recited is,-
In combined slotting and planing machines of the class hereinbefore referred to
(videlicet, in which the cutting tool is made to travel both vertically and
horizontally, the tool slotting vertically with a horizontal feed, and planing
horizontally with a vertical feed), effecting the feed independently of sur
momentum of the tool holder by causing a clutch, actuated or driven by the strap
power, to impart motion to the feeding slide whether planing or slotting is being
done, and such clutch to be thrown out of gear by a cam or tappet when the
requisite feed has been effected, substantially as hereinbefore described.
In witness whereof, I, the said John Craven, have hereunto set my hand
and seal, this Sixteenth day of December, in the year of our Lord One
thousand eight hundred and eighty.