Improvements in the Knives used in Pug-mills and such like Machinery.
Year: 1896

page_text: Date of Application, 30th Oct., 1896
Complete Specification Left, 30th July, 1897-Accepted, 25th Sept., 1897
Date of Application, both OCL., 1990
Complete Specification Left, 30th July, 1897-Accepted, 25th Sept., 1897
PROVISIONAL SPECIFICATION.
Improvements in the Knives used in Pug-mills and such like
Machinery.
I, JAMES AYNSLEY of Blurton Stoke-on-Trent in the County of Staffordshire,
Gentleman, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in knives used in pug-mills and such
like machinery and has for its object to provide simple and efficient means for
attaching the said knives to their revolving shaft.
In pug-mill knives as hitherto constructed the said knives have been formed
with a screwed haft for the purpose of screwing them into the shaft of the pug-
mill and when such knives have become worn out a new one has had to be welded
onto the screwed haft or pin.
Now the object of my invention is to obviate this inconvenience for which
purpose I form my improved knives with a loop or slotted extension so arranged
that a tapered pin or key passed therethrough can also be passed through a slot
in the pug-mill shaft to which it may be secured by means of a cottar or a screw
nut or by other suitable means.
These pins or fastening devices can be used from time to time for securing
different knives in position and by means of this arrangement considerable cost
will be saved in repairs.
My improved knives or blades may be made of cast metal and the pins of
wrought or of other suitable metal as desired.
J. B. FLEURET,
5, Hatton Garden, Holborn Circus, London, E.C.,
Agent for the Applicant.
MPLETE
ATION.
Improvements in the Knives used in Pug-mills and such like
Machinery.
I, JAMES AYNSLEY of Blurton, Stoke-on-Trent and of the Anchor Pottery
Longton, in the County of Staffordshire, Gentleman, 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 improvements in the knives used in pug-mills and such
like machinery and has for its object to provide simple and efficient means for
attaching the said knives to their revolving shafts whereby the same may be
easily exchanged for new ones when worn out or otherwise injured.

page_text: In pug-mill knives as hitherto constructed it has been customary to form them
with a screwed haft for the purpose of screwing them into the shaft of the pug-
mill and when such knives have become worn out it has been necessary to weld a
new one on to the screwed haft or pin.
Now my invention has for its object to obviate this inconvenience for which
purpose I form my improved knives with a loop or slotted extension so arranged
that a tapered pin or key may be passed through the slot and likewise through a
slot in the pug-mill shaft to which it is secured by a key or cotter or by a screw
nut or other suitable means.
And in order to clearly understand my said invention I will describe the same
with reference to the accompanying sheet of drawings in which Fig. 1 is an
elevation of a portion of a pug-mill shaft with the knives attached thereto and
Fig. 2 is a sectional plan of the same. Figs. 3 and 4 are similar views of a modi-
fication and Fig. 5 is a separate end view of one of the knives, A represents the
pug-mill shaft and bare the knives attached thereto. The said knives are
formed with a loop e provided with a slot c¹.
In order to connect the knives to the shaft a the tapered key, or it may be a
pin is passed through the slot c and also through a slot in the shaft as shewn in
Figs. 1 and 2. The key d is tightened up or secured to the shaft by another key
or cotter e passing through a slot in the end of the said key d. This key prefer-
ably bears against a plate or 'washer f let into a recess or flat surface formed in
the shaft a the loop e of the knife being likewise let into a similar recess or flat
surface on the opposite side of the shaft."
Instead of securing the key d by a key or cotter e it may be secured by a nut g
screwed on to the end of a pin or bolt h formed on the end of the key d as shewn
in Figs. 3 and 4 the nut bearing against a washer g carried in a recess in the
shaft and the latter being formed with an opening a to permit of the passage
therethrough of the said pin or bolt.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
(1) In knives for pug-mill shafts or such like machinery forming the same
with a loop or slotted extension such as c for receiving a tapered key or pin d
passing through a slot in the shaft and fixed to the same by means of a key or
cotter e and washer f substantially as described and for the purpose specified.
(2) The modified arrangement for fixing knives to the shafts of pug-mills or
such like machinery substantially as described and shewn with reference to Fig. 3
and 4 of the drawings.
(3) The improved means of attaching knives to the shafts of pug-mills or such
like machinery substantially as described and shewn in the drawings.
Dated this 30th day of July 1897.
J. B. FLEURET,
5, Hatton Garden, Holborn Circus, London, E.C.,
Agent for the Applicant.