AN IMPROVED LATHE CARRIER OR DOG
Year: 1885

page_text: I, JOHN BARLOW, of N° 1 Wilford Cottages, Goodhead Street, Nottingham, in
the county of Nottinghamshire Engineer, do hereby declare the nature of my
invention for AN IMPROVED LATHE CARRIER OR DOG to be as follows:-
This invention has for its object to provide a lathe carrier or dog that shall be
capable of receiving iron of various diameters.
In carrying my invention into effect I employ a fork shaped frame; the inner
sides of the tangs or legs are provided with ratchet teeth; a link is made to fit
over and slide up and down the said tangs or legs; the said link is provided with
a groove in one or both of its inner side faces, to receive a projection on one or
both of the sides of a nut for the purpose of keeping the same central, and for
preventing lateral movement, the said nut is further provided with a screw for
securing the object to be carried, also with angular projections one on each side-
and with a spring fixed near the top of the face of such nut, for the purpose herein
after described; on each side of the nut and inside the link, are two side pieces
provided on one face with teeth corresponding with those in the frame, these side
pieces are also provided with angular slots corresponding with the projections on
the sides of the nut, the said side pieces are kept in the link by suitable means, but
are free to move laterally. The angular projections afore mentioned are received
in the slots provided in the side pieces, and act as cams or guides for the said side
pieces, for the purpose of drawing them out of lock from the teeth of the frame,
when it is required to lessen or increase the space for receiving a smaller or larger
size of iron or article, which is effected by slightly tapping the nut downwards,
which movement cause the projections on the nut to draw in the side pieces, and
when the required space is attained, the nut is forced back again, bringing with it
the side pieces which by this movement extend laterally, and at once engage with
the teeth of the frame; a spring fixed conveniently on the face and near the top of
the nut prevents it falling out of the link. This operation is only required when
altering from a small to a large size or vice versa, as the screw which works in the
nut allows for slight differences in the size.
A lateral movement may also be given to the side pieces by passing pins through
the link and the lower ends of the side pieces, and also providing each side piece
with a lip or projection near the said pins, and by slightly tapping the nut-which
moves between the two side pieces-downwards, will cause the lower face to catch.
the lips or projections and swing them out of lock from the teeth of the frame.
D
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page_text: I, JOHN BARLOW of No 1 Wilford Cottages, Goodhead Street, Nottingham
Nottinghamshire Machine Fitter do hereby declare the nature of my invention
for AN IMPROVED LATHE CARRIER OR DOG and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
L
The object of this Invention is to provide a lathe carrier or dog that shall be
capable of receiving iron of various diameters, and easy to adjust.
In carrying my Invention into effect I employ a forked shaped frame having two
prongs the inner side of each prong is provided with ratchet teeth.
A link is made to fit over and to slide up or down the said prongs as may be
required; slots are provided on the inner faces of the link and about the middle of
the long sides to receive a projection which is formed on one or both sides of a nut
for the purpose of keeping the same central and to prevent lateral movement.
The said but is further provided with angular projections--one on each side-
which projections extend outwards and downwards making an angle with the side
of the nut similar to an inverted V: the said nut is also provided with a spring
fixed near the top of the nut and above the upper edge of the link, to prevent it
from falling out of the link, and with a screw to secure the article to be carried.
Loose side pieces with teeth on one face corresponding with those on the inner
sides of the prongs-and one on each side of the nut-are free to move laterally
inside the link by means hereinafter described, the said side pieces are each
provided with a shoulder top and bottom or other suitable means to prevent them
falling out of the link and are further provided with inclined holes or slots corre-
sponding with the projections on the sides of the nut.
The angular projectious on the sides of the nut aforementioned are received in
the slots or holes provided in the side pieces and act as guides for the said side
pieces when it is required to lock them to the frame or to draw them out of lock,
the upper shoulders of the side pieces extend towards the nut, and when they are
being locked to the frame the top of the nut catches against these upper shoulders
and assist the projections to throw the side pieces into lock.
In order that my Invention may be more fully understood I will now proceed to
describe the Drawings annexed hereto.
DESCRIPTION OF THE DRAWINGS.
Fig. 1. is a section showing the side pieces locked with the teeth of the frame,
with a piece of iron secured ready for use.
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th side niesse unlocked and the link which carries

page_text: lifting up and out of the link L when pressure is being put upon the object being
carried by the set screw D. and
Fig. 4. is a plan of the link.
The same letters of reference indicate corresponding parts in all the figures.
A is the frame, B the nut C the loose side pieces, D the set screw and L the
link.
E is the angular projections on the sides of the nut B. F the inclined slots or
holes provided in the side pieces C. G the projection on the nut B (Fig. 3.) which
fits into the slot H of the link L (Fig. 4.) to prevent the nut from moving laterally.
I is a pin or catch to prevent the nut falling out of the link and is cushioned with
a spring J. K is a piece of iron shown secured in Fig. 1.
On reference to Fig. 1. it will be seen that the side pieces C are locked with the
teeth of the frame A and that the carrier is ready for use, having a piece of iron
secured therein.
When it is required to alter the capacity of the carrier in order to take a larger
or smaller size the operator gently taps down the nut B. which movement
compresses the spring J. and causes the projections E to move down the slots F and
thus draws the side pieces C out of lock from the teeth of the frame A as seen at
Fig. 2.
The link L which carries the side pieces C and the nut and screw B and D can
then be moved up or down the prongs of the frame A to the required opening or
space; the operator then presses the nut B upwards with his fingers which move-
ment causes the projections E to force the side pieces C again into lock with the
teeth of the frame; the locking of the side pieces with the frame is also assisted
by the top edge of the nut as it is being pressed upwards, pressing against the
upper rounded shoulders M of the side pieces and thus forcing them into lock.
This operation is only required when altering from a small to a larger size or
vice versa, as the screw D which works in the nut B allows for slight differances
in the size of iron or articles to be carried.
When the object is secured the lower flange of the nut presses to the lower edge
of the link, and the top edge of the link presses to the upper shoulders of the side
pieces thus keeping the teeth firmly locked.
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
The construction and employment of a lathe carrier or dog as described and
illustrated herein consisting of a frame (A) having teeth on the inner sides of the
prongs, of a nut (B) having projections (E) on one or each side the said nut being
free to move up and down the link (L) as required, of loose pieces (C) provided
with teeth on one face and with an inclined hole or slot for the reception of the
projections (E) for the purpose of imparting lateral movement thereto, and of a
link or band (L) which encircles the prongs of the frame (A) and contains the
said side pieces and nut all substantially as set forth and illustrated in the
accompanying Drawings.