Year: 1888

page_text: Date of Application, 27th Mar., 1888
Complete Specification Left, 11th Sept., 1888
Complete Specification Accepted, 9th Nov., 1888
I, WILLIAM PATRICK BRUCE, of Kinleith Mill, Currie, Midlothian, Paper Manu-
facturer, do hereby declare the nature of this invention to be as follows:-
This invention is specially applicable to strainers of the flat "jog" type. I prefer
those in which an even jog is given to the whole surface of the strainer.
Instead of introducing the stuff first into the strainer (as is usually done) when it is
strained through the plates, which form the bottom of the strainer, into the vat in which
the strainer works from which it runs to the machine, I reverse the process intro-
ducing the stuff first into the vat which is made deeper than usual whence it rises
through the plates which have been turned upside down in the strainer to keep the
smooth side towards the flow. The strained stuff will then be in the strainer instead
of in the vat. From the strainer it is run to the machine by a pipe which passes
through the vat. This pipe is connected to the strainer by a joint of rubber or other
suitable material to allow for the jog of the strainer. From the vat in which the
dirt, knots, etc. accumulate a pipe may be led to an auxiliary strainer.
Suitable provision must be made for introducing the stuff into the vat. If desired
an agitator may be fitted in the vat below the strainer.
Strainers of this construction might be made to work either way. Either in the
way above described or by introducing the stuff direct into the strainer (in the usual
way) when it would strain down into the vat the pipe from which must in this case be
connected with the machine instead of the auxiliary strainer. The rubber jointed
pipe from the inside of the strainer instead of going to the machine must go to the
auxiliary strainer.
Dated thin 97th day of March 1888

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Paper and in Apparatus
therefor.
I, WILLIAM PATRICK BRUCE of Kinleith Mill, Currie, in the County of Edinburgh,
Paper Manufacturer, 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 :-
The invention relates to an improved construction of the apparatus for straining
the pulp in the manufacture of paper, half-stuff, millboard and analogous materials
and is applicable to the "jog" style of strainer, that is in which the frame carrying
the screened plates is hung in the vat so that a jog action can be imparted to the said
frame. I prefer to give an even jog over the whole surface of the plates.
The frame may be supported in the vat in a variety of ways, as in existing jog
strainers. The method of doing so is not a material point, so long as the frame has
freedom to jog or shake in the vat. The plates may be fixed in the frame in the
usual manner. The top of the plate surface is connected to the bottom of the vat
by means of a flexible or sliding watertight joint pipe.
The flexible joint shown on the drawing is a round rubber ring; which forms the
connection by being pressed between the bottom of the plate and the bottom of the
vat. The flexible joint may take the form of a rubber or other pipe; or if a sliding
joint a tube working in a stuffing box. The stuff is run into the vat from the supply
pipe and is cleaned by passing in an upward direction, through the plates, the head
of stuff forming the only pressure against the plates. In this arrangement the
tendency of the frame to rise under the pressure is utilised to make the strainer by a
suitable arrangement of the cams or other shaking appliance, automatic in so far
as when the stuff is turned on to the vat the frame will rise against the cam falling
out of work when the stuff is shut off. The strained stuff is carried directly from
the top of the plates through the above mentioned tube which is fixed to the plate
and bottom of vat at the place most convenient for the outlet to the machine. The
stuff rejected by the plates may be drawn off to the auxilliary strainer.
DESCRIPTION UN DRAWING.
A-the frame of the strainer.
B-the plates forming the bottom of said frame.
C the outlet of the strained stuff.
D-the rubber ring forming a watertight joint, between the bottom of the frame
and the vat, the stuff to be strained being in the vat F.
E the inlet pipe.
G-the strap attached to frame A. and carries the hammer H. against the cam I.

page_text: Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the said is to be performed 1 declare that what
I claim is :-
I. The improvement in the construction of that form of strainer in which the
stuff rises through the plates fixed in a frame which is hung in a vat among the
stuff to be strained; said improvement consisting of working the frame with
the plates immersed to form a head of stuff outside the frame resulting in the
required pressure against the plates.
II. To carry the stuff directly off the upper side of the plates forms a necessary
part of my invention, An aperture in one or more plates is connected to corre-
sponding apertures in the vat by flexible joints or sliding connections to allow for
the shaking movement of the frame. The plates being fixed at any plane or angle in
the stuff and connected to the outlet to paper machine in the manner herein
described.
III. The placing of the cams (or other appliances used for imparting the jog) in
such a position that when they strike the hammers they tend to depress the strainer
into the vat.
By this method the ordinary action is reversed and the tendency of the strainer to
rise in the vat is utilised to increase the efficiency of the jog.
DL: 1715
1000
WILLIAM P. BRUCE.