AN IMPROVED JACK JOINT FOR LOOMS
Year: 1884

page_text: JOHN REBBLA Tuner 9 Dial Terrace Bank Leeds Yorkshire do hereby declare
the nature of my invention for AN IMPROVED JACK JOINT FOR LOOMS to be as
follows:-
The improvement is effected by making a circle at the bottom of the vertical
jack or jack hook with a flange casted on the front side, the flange is cut away at
each side so as to receive a boss and feather which is casted at the end of the
horizontal jack the boss fitting the circle in the vertical jack and when placed in
and moved into position the feather on the back of the horizontal jack slides at
the back of the flange on the vertical' jack which keeps the jack from becoming.
detached when in motion, this improvement dispenses with pins or rivets, also
cores in casting which is a great advantage to the joint..
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JOHN REBBLA.
COMPLETE SPECIFICATION.
...
I JOHN REBBLA of 9 Dials Terrace, Bank Leeds in. the county of York Loom
Tuner do hereby declare the nature of the said Invention for "AN IMPROVED JACK
JOINT FOR LOOMS," and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:—
The object of my invention is to construct jack joints for looms, with secure and
firm joints, made by simply casting them in the form. required, dispensing with all
pins rivets, and fittings, labour and difficulty in casting. I form a circular recess
Pris 31

page_text: in the bottom of the vertical jack hook, on the sides of the recess are formed
flanges which are cut away at one or each side, at opposite points.
The circular recess opposite the flanges is cut through forming semicircular slots,
so that there is no difficulty in casting; that part of the back which is left in,
protects the joints, and presents an even surface to the next jack when in working
position.
The horizontal jack is cast with a boss and projecting feathers or inclines, at
each side, which pass through the recesses in the flanges of the vertical jack hooks,
and work under them, the flanges retain the jacks in position, and form a secure
and. firm joint, the hooks being easily detached and replaced when required, this
arrangement. dispenses with pins, rivets, all fittings and cores in casting; or the
vertical jack may have the boss and projections cast thereon, and the horizontal
jack the recesses and joint.
Jack the recesses and joint.
DESCRIPTION OF DRAWINGS.
Fig. 1 shews elevation of parts of borizontal and vertical jacks, with joints in
working position.
Fig. 2 is a section of Fig 1, through the line E, F.
Fig. 2 is a modification of Fig. 2 shewing V shaped flanges and feathers.
Fig. 3 is an elevation of jacks on opposite side to Fig. 1.
Figs 4 and 5 are elevation and plan of horizontal jack detached.
Figs 6 and 7 are elevations detached of each side of vertical jack.
Fig 8 is a section of Fig. 7 on the line G, H.
A is the horizontal jack B, the vertical jack. I form a circular recess C, in-the
bottom of the vertical jack hook B, on the sides of the recess are formed flanges D,
which are cut away at each side at opposite points J. The circular recess C,
opposite the flanges is cut through forming semicircular slots K, so that there is
no difficulty in casting; that part of the back L, which is left in protects the joints
and presents an even surface, to the next jack, when in working position, or the
jacks may be cast without backs, though these backs are preferable.
1
The horizontal jack A is cast with a boss M, and projecting feathers or
inclines N, at each side which pass through the recesses J, into the flanges D, of
the vertical jack hooks B, and work under the flanges K, which retain the jacks
in position, and forms a secure and firm joint, the hooks. being easily detached and
replaced when required, this arrangement dispenses with pins, rivets, all fitting,
and cores in casting, or the vertical jack may have the boss and projections cast
thereon, and the horizontal jack the recesses and flanges, no studs are used.
Having now particularly described and ascertained the nature of my said-
Invention and in what manner the same is to be performed I declare that what
I claim is
Jack joints formed by feathers, or inclines N, (on one part of the jack or lever)
working under corresponding shaped flanges or inclines D, on the other part of the
jack, dispensing with the use of cores, studs, pins, and rivets as shewn and
described.