Improvements in Engines or Dobbies for Weaving Looms.
Year: 1892

page_text: Date of Application, 24th May, 1892
Complete Specification Left, 24th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Engines or Dobbies for Weaving Looms.
I, MARK LEACH, of Sunbridge Road, Bradford in the County of York,
Machine Maker, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in Hattersley's and other similar dobbies
or engines for weaving looms in which the jack levers or lifting levers are formed
with an arm attached to a "balk or rocking bar having a catch or draw hook at
each end. The said balk is now generally mounted or has its fulcrum upon a stud
cast on the side of said arm but owing to the confined space in which the jack
levers are mounted this stud is necessarily very short and affords only a very.
narrow bearing for the balk. The object of this invention is to increase the width
of this bearing without increasing the distance between the jack levers.
'
For this purpose at the back or at that side of the stud where practically the
whole of the wear and tear takes place I cast a hole of suitable size through the
arm of the jack lever close to the root of said stud and I continue the stud in the
form of a semicircular projection or approximately semicircular projection through
such hole. And I provide a segmental projection on the central boss of the balk
adapted to pass into said hole and form a bearing upon said semicircular con-
tinuation of the stud. The end of the arm is made larger to allow of said hole
being made without weakening the part and the balk may be somewhat bent or
curved laterally to bring the strain over the centre of the bearing.
A further object of this invention is to facilitate the attachment of the catches
to the ends of the balk.
For this purpose I bifurcate the end of the catches in the ordinary manner and
I form suitably shaped hooks therein to receive the studs or pivots on the balk and
I provide lips, stops or projections on the balk which prevent such catches being
unhooked when at the proper working position but which leave them free to be
readily disengaged when placed at a suitable angle with the balk other than the
working angle.
The ends of the balk may be forked instead of the catches and the said lips,
stops or projections formed on the catches.
Dated this 23rd day of May 1892.
!
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Engines or Dobbies for Weaving Looms.
I, MARK LEACH, of Sunbridge Road, Bradford, in the County of York,
Machine Maker, 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 Hattersley's and other similar dobbies
or engines for weaving looms in which the jack levers or lifting levers are formed
with an arm attached to a "balk" or rocking bar having a catch or draw hook at
each end. The said balk is now generally mounted or has its fulcrum upon a stud
cast on the side, of said arm but owing to the confined space in which the jack
levers are mounted this stud is necessarily very short and affords only a very
narrow bearing for the balk. The object of this invention is to increase the
width of this bearing without increasing the distance between the jack levers.

page_text: For this purpose at the back or at that side of the stud where practically the
whole of the wear and tear takes place I cast a hole of suitable size through the
arm of the jack lever close to the root of said stud- and I continue the stud in
the form of a semicircular projection or approximately semicircular projection
through such hole. And I provide a segmental projection on the central boss of
the balk adapted to pass into said hole and form a bearing upon said semicircular
continuation of the stud. The end of the arm is made larger to allow of the said
hole being made without weakening the part and the balk may be somewhat bent
or curved laterally to bring the strain over the centre of the bearing.
Reference is to be had to the accompanying sheet of drawings forming a part of
this Specification in which similar letters of reference indicate corresponding parts
in each of the figures.
Figure 1, represents a side elevation of a jack lever with a balk mounted thereon
in which the stud and bearing thereof are formed in the above described manner.
Figure 2, is a section of the stud arm of the jack lever and the balk on the
broken line 6 in the former figure.
a,
Figure 3, is a separate view of the opposite side of the stud arm of the jack
lever to that shown in Figure 1.
Figure 4, is a plan view of the same.
Figures 5, and 6 are respectively an edge view and side view of the balk shown
separate.
The stud arm A of the jack lever B is provided with the usual stud C to support
the balk D by its central hole or bearing E. But a hole F is made in the arm at
the back of the stud and the stud is continued through such hole in the form of a
semicircular projection G the same size as the stud. And the side of the balk D
next to the arm A is provided with a segmental projection H forming a con-
tinuation of the bearing E which is adapted to pass into the hole F and bear upon
the continuation G of the stud C.
The balk D is preferably bent laterally as shown in Figure 5 to bring the strain
more over the centre of the bearing.
It is obvious that the stud C may be cast on, and the hole F made in, the balk
and the bearing E and segmental projection formed in and on the arm A.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
The improved joint or connection between the jack levers and balks of dobbies
whereby the breadth of the bearing between the two is increased in width,
substantially as herein shown and described.
Dated this 22nd day of February 1893.
DRACUT & NOWELL,
Bradford, Agents.