Improvements in Crank Arms of Looms for Weaving.
Year: 1890

page_text: Date of Application, 16th May, 1890
Complete Specification Left, 14th Feb., 1891-Accepted, 14th Mar.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Crank Arms of Looms for Weaving.
We, JOHN HENRY BURY, of 398, Union Road, Engineer, and JAMES BOOTH,
of 60, Roegrave Road, Manufacturer, both of Oswaldtwistle, in the County of
Lancaster, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the crank arms of looms for weaving,
and the object is to construct crank arms which are more durable, effective, and
readily adjusted than heretofore, and consists in making the strap of the arms in
one piece, and the block in two pieces, each piece, or block being forced apart by
gib pins, or keys, and inclined cotter pin as ordinary, and by means of which the
whole depth of the blocks, are in contact with, and form wearing surfaces for the
gib keys.
According to this our invention the strap of the crank arm is formed in one piece,
and in this strap are formed, and carried two blocks, one end of each block having
formed in it a half portion of the eyes, or holes at each end of the crank arm, and
through which the crank shaft, and pin, works respectively. At the other ends of
these blocks we form slots, and also corresponding slots in, and through the strap,
in which are received two gib pins, the outer ends of which enclose, or grip the
outer sides of the strap, and the inner surfaces bear against the faces of the slots in
the blocks. Between the two gib pins is placed a cotter pin having a longitudinal
slot formed in it, and on the top of the strap is cast or otherwise formed a lug
with a slot, or eye in it, through which, and through the slot in the cotter pin we
pass a bolt, held in position by a nut.
When it is necessary to tighten up the arm by making the eyes, or holes at each
end less, the nut is loosened on the bolt, and the cotter pin, which is formed with
inclined faces as ordinary, is forced further between the gib pins, thus forcing the
blocks further apart, and their halves of the eyes, or holes, nearer to the correspond-
ing halves, or holes fixed at each end of the strap; and thus the several parts are
tightened, or adjusted as much as necessary, whereon the nut is again screwed
upon the bolt, and the arm is ready for working.
Dated this 14th day of May 1890
WALTER
BRIERLEY,
Central Chambers, Halifax, Agent, for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Crank Arms of Looms for Weaving.
We, JOHN HENRY BURY, of 398, Union Road, Engineer, and JAMES BOOTH,
of 60, Roegrave Road, Manufacturer, both of Oswaldtwistle, in the County of
Lancaster, 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 crank arms of looms for weaving
and the object is to construct crank arms which are more durable, effective, and
readily adjusted than heretofore, and consists in making the strap of the arms in
one piece, and the block in two pieces, each piece or block being forced apart by
gib pins, or keys, and an inclined cotter pin as ordinary, and by means of which

page_text: the whole depth of the blocks, are in contact with, and form wearing surfaces
for the gib pins.
According to this our invention the strap of the crank arm is formed in one piece,
and in this strap, are formed and carried two blocks, one end of each block having
formed in it a half portion of the eyes, or holes at each end of the crank arm, and
through which the crank shaft, and pin works respectively. At the other end of
these blocks we form slot, and also corresponding slots in, and through the strap,
in which are received two gib pins, the outer ends of which enclose, or grip the
outer sides of the strap, and the inner surfaces bear against the faces of the slots in
the blocks.
Between the two gib pins is placed a cotter pin, having a longitudinal slot formed
in it, and on the top of the strap is cast or otherwise formed, a lug with a slot, or
eye in it, through which, and through the slot in the cotter pin we pass a bolt, held
in position by a nut.
When it is necessary to tighten up the arm by making the eyes, or holes at each
end less, the nut is loosened on the bolt, and the cotter pin, which is formed with
mclined faces as ordinary, is forced further between the gib pins, thus forcing the
blocks further apart, and their halves of the eyes or holes, nearer to the
corresponding halves, or holes fixed at each end of the strap; and thus the several
parts are tightened, or adjusted, as much as necessary, whereon the nut is again
screwed upon the bolt, and the arm is ready for working.
Such being the nature and object of our said invention the following is a complete
description of same, reference being made to the accompanying drawings forming
a part of this Specification in which :-
Fig. 1 is a side elevation of one of our improved crank arms.
Fig. 2 is a plan view of Fig. 1.
The several figs. on Sheet 2 are details drawn separately in order to more
clearly shew their construction.
Crank arms constructed according to this our said invention consist of the strap 1
in which strap are received and carried the two blocks 2. 3 free to slide (when
the cotter pin is removed) in the said strap 1. One end of the smaller block 3 has
a semicircular recess, 4 which forms a half portion of the " eye" or hole 5 through
which the crank pin 6 is received and works, and at one end of the larger block 2 we
also form a semicircular recess 7 which holds, and presses against one half, or
segment of a brass collar or bush 8 through which the crank shaft 9 of the loom
works.
The inner ends of the blocks 2. 3 have slots 10. 10 formed in them, corresponding
slots 11. 11 being formed in the strap 1. These slots 10. 11 10. 11 receive the gib
pins 12. 12. the ends 13. 13 of which overlap, and grip the outer portions of the
strap 1, and thereby hold the several parts in position. Between the gib pins 12. 12
is placed the wedge shaped cotter pin 14 having a longitudinal shot 15 formed in it.
A nut and bolt 16 secure the cotter pin in position by the bolt passing through
the longitudinal slot 15 and through a slot 17 formed in the lug 18 cast to the
strap 1.
The blocks 2. 3 are prevented from moving sideways, or laterally in the
strap by the slots 10. 10, and pins 12. 12 and the flange 19 on the collar or
bush 8.
The improved crank arm is manipulated as follows:-When, say, it is necessary
to tighten up the arm by making the holes or eyes, 5. 20 less in diameter; the nut
is loosened on the bolt and the wedge shaped cotter pin 14 knocked or pushed
further down, and so forcing apart the gib pins 12. 12 and blocks 2. 3 and the
recesses, 4. 7 are thereby brought nearer to the corresponding recesses which go to
make up the complete hole or eye" the nut is then tightened on the bolt, and
the whole of the parts are fixed in position, and the arm is ready for working. To
make the holes, or eyes" of larger diameters the wedge shaped cotter pin is
partly withdrawn, and the several parts moved in an opposite direction to that
above described.

page_text: Having now particularly described and ascertained the nature and object of our
said invention, and in what manner the same is to be employed, we declare that
what we claim is :-
(1) The general construction, combination, and arrangement of parts constituting
our improved crank arm, as and for the purpose herein set forth and substantially
as illustrated by the annexed drawings.
Dated this 13th day of February 1891
JOHN HENRY BURY.
JAMES BOOTH.
By their Agent, Walter Brierley,
Central Chambers, Halifax.