Improvements in the Construction of Screw Gill Machinery.
Year: 1887

page_text: Date of Application, 23rd Sept., 1887
Complete Left, 23rd June, 1888
Complete Accepted, 27th July, 1888
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Screw Gill Machinery.
We, JOHN CHARLES WALKER, of Shipley Fields Mill, Mechanical Engineer, and
JONATHAN EDWARD STEPHENSON, of St. Pauls Road, Manager, both of Shipley near
Bradford in the County of York do hereby declare the nature of this invention to be
as follows:-
Our improvements refer to the construction of the fallers.
Fallers have hitherto been made from bars of metal and cut at the ends to form the
required shape of heads to work in the screws, and milled or otherwise cut to form
the slot for the spring guide, and further milled or otherwise cut out on edge to
receive the strip or bar containing the gill pins, which is afterwards soldered thereto.
Now according to our invention we press or stamp the faller from a bar of metal
to the required shape with its heads or ends the proper angle for the screw thread, and
with recesses for the spring guide, and also recessed or flanged, if necessary, to receive
a brass gill plate.
To save time and cost, and to enable the gills to be more readily repaired than here-
tofore, we fasten the pinned gil! plate in the recessed side of the faller, such faller
being stamped as above described, or of the ordinary milled or machined construction,
so that the pins when damaged can be changed or replaced without removing the
flanged faller into which the pins are inserted.
Our improvements further relate to the means employed for lifting the fallers from
the lower to the upper screws, or vice versa.
When preferred we form the screws with two or more threads, and obtain thereby a
much higher speed with safety than heretofore also the required strength of screw and
faller head is retained.
In screws as ordinarily employed the lifting cams of the bottom or top screws in
their rotation do not extend and work below the bottom of the thread of the screw

page_text: into which they conduct the fallers. Now in our improvements we retain the faller
ends the same strength as when single threaded screws are employed, also the screwed
thread retains its strength. For this purpose the screws are made of larger diameter
than heretofore, and by so increasing such diameter, the fallers are kept vertical or
nearly so, whether one, two or more threads are employed. We also make the faller
ends shorter and consequently much stronger, and increase the depth of the cam to
make up for the short head therefore requiring that the groove for the passage of such
cam should be cut below or deeper than the thread of the screw.
Dated this 23rd day of September 1887.

page_text: Improvements in the Construction of Screw Gill Machinery.
WC, JOHN CHARLES WALKER of Shipley Fields Mill, Mechanical Engineer and
JONATHAN EDWARD STEPHENSON of St. Pauls Road, Manager, both of Shipley near
Bradford in the County of York, 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 :-
-
Our improvements refer to the construction of fallers employed in screw gill
machinery, and further to the means employed for lifting the same from the lower to
the upper screws, and vice versa.
In the accompanying drawings Fig. 1 is a longitudinal elevation. Fig. 2 is a cross
section, and Fig. 3 a plan looking at the top of faller constructed in accordance with
our invention. Fig. 4 is a side elevation of a pair of upper and lower traversing
screws, and Fig. 5 is a cross section of the same shewing the slides and gill bars or
fallers in connection with the screws, also constructed in accordance with our invention,
and Figs. 6 and 7 are respectively an elevation and cross section of old arrangement
of traversing screw and gill bars or fallers.
Fallers have hitherto been made from bars of metal and cut at the ends to form
the required shape of heads to work in the screws, and milled or otherwise cut to
form the slot for the spring guides, and further milled or otherwise cut out on edge
to receive the strip or bar containing the gill pins, which is afterwards soldered
thereto. Now according to our invention we press or stamp the faller A from a bar
of metal to the required shape with the beads or ends B of the proper angle for the
screw thread, and with recesses C for the spring guides, and also recessed or flanged
at D to receive a brass gill plate E. To save time and cost and to enable the gills to
be more readily repaired than heretofore we fasten the brass gill plate E in the
recessed side D of the faller A so that the pins when damaged can be changed or
replaced without removing the flanged gill plate E into which the pins F are inserted
as shewn at Figs. 1, 2 and 3.
In screws as ordinarily employed as shewn at Figs. 6 and 7, the lifting cams G of
the bottom and top screws H do not extend and work below the bottom of the thread
of the screw into which they conduct the fallers. Now in our improvements (Figs. 4
and 5) we make the faller ends J shorter and consequently much stronger, and
increase the depth of the cams K of the lower screw L to make up for the short head
or ends J, therefore requiring that the grooves or recesses M for the passage of such
cams K should be cut below or deeper than the bottom of the thread of the top
screw N as shewn, so that the cams K in their rotation can pass below the bottom of
the thread of the top screw N for the purpose of lifting the fallers into the screw
thread and at the same time into their proper position for working on the top of the
slides or saddles P.
When preferred we form the screws with two or more threads and obtain thereby
a much higher speed with safety than hitherto, also the screwed thread retains its

page_text: strength. In this arrangement the screws may be made much larger than heretofore
and by so increasing such diameter the fallers are kept vertical or nearly so, whether
screws with one, two or more threads are employed.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1st. The arrangement and construction of fallers having gill plates applied thereto,
substantially as and for purposes herein set forth.
2. The arrangement of grooves or recesses M. in the top screw N, so that the
cams K of the lower screw L in their rotation can pass below the bottom of the
thread in such top screw N, substantially as and for purposes herein set forth.
Dated this 23rd day of June 1888.
J. W. HARDING,
Agent for the Applicants.