IMPROVEMENTS IN CHUCKS FOR TURNING LATHES
Year: 1882

page_text: LETTERS PATENT to Henry Harris Lake, of the firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for an Invention of
“IMPROVEMENTS IN CHUCKS FOR TURNING LATHES" Communicated to him
from abroad by Louis Frobeen of Berlin, Prussia
PROVISIONAL SPECIFICATION left by the said Henry Harris Lake at the
Office of the Commissioners of Patents on the 28th Jane 1882.
HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN CHUCKS FOR TURNING
LATHES [A communication to him from abroad by Louis Frobeen of Berlin,
Prussia]
This Invention relates to improvements in chucks, and in carrying the said
Invention into practice I provide a head or block having three or more recesses
for the reception of a corresponding number of tightly fitting guide-pins. A ring
is placed upon the said block, said ring being provided with a cylindrical recess
for the reception of a worm loosely inserted in said recess. The said worm gears
with worm-teeth cut in the side of said block, and may be turned by means of
a handle, the angular end of which fits a corresponding hole in the said worm.
The said ring, near its inner periphery, is provided with vertical grooves which are
arranged opposite to the corresponding guide-pins in the block. A suitable number
of lever plates which may be cut out of sheet-metal by means of the same die, are
provided, near one of their ends, with a hole fitting the said guide-pins, while near
their opposite ends, they are provided with a projection fitting the said grooves in
the ring. The said lever-plates with their holes are slid alternately over the said
guide-pins so that they are fulcrummed at the said pins, their opposite ends, with
their said projections, resting in the said opposite grooves of the ring so that they
will be rotated by the latter. The said lever-plates are so arranged that if there
are three guide-pins and three grooves used, the first and fourth plate will be
fulcrummed on the first guide-pin, while the second and fifth will swing on the
second pin, and so forth. A cover provided with screw-holes corresponding in

page_text: number with the number of guide-pins applied, is screwed down upon the said
lever-plates and holds them in position; the screw catches in the threaded inner
part of the said guide-pins. The said cover also bears upon the upper part of the
said ring, thus fastening the latter upon the said block
The said block, next to its worm-teeth, is partly cut away so as to allow of
bringing the said ring with the worm resting loosely in its said recess, upon the
said block, the projecting parts of the said worm passing freely through the cut-
away part of the block. Then the worm is turned by means of the handle so as
to catch in the teeth cut in the said block.
A griping or holding opening of the chuck is obtained as follows, the said block
is screwed upon the rotating part of the lathe or machino in which it may be used.
The worm is turned by means of the handle, and, catching in the worm-teeth on
the stationary block, the ring will be drawn around the said block carrying the
said guide-pins. The said lever-plates fulcrummed at the said stationary guide-
pins will swing around with their opposite ends resting in the said vertical grooves
of the ring, until they will strike, with one of their sides, against the inner periphery
of the said ring, and thereby a further movement of the latter will be prevented.
A central hole is now bored or cut through the cover plate and through all the
lever-plates.
The article to be held by the chuck is then inserted in this central hole and the
worm is turned in the opposite direction, consequently the lever-plates will be
turned back again with the ring, and being held stationary near their fulcrummed
end will reduce the griping aperture uniformly from all sides, thus griping firmly
any article inserted in the said aperture.
This chuck may also be used for the stretching of wire.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Harris Lake in the Great Seal Patent Office on the 28th
December 1882.
HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN CHUCKS FOR TURNING
LATHES. A communication to me from abroad by Louis Frobeen, of Berlin,
Prussia
"
This invention relates to improvements in chucks chiefly designed to be used
with lathes for turning, boring, or similar purposes.
In the accompanying drawing
Figure 1, is a vertical section of a chuck constructed according to this invention.
Figure 2, is a horizontal section of the same.
Figure 3 is a top view or plan of the said chuck, when open, the covering plate
Leing removed
Figure 4 is a similar view, but showing the chuck in a closed or griping
position.
Similar letters of reference indicate corresponding parts in the several figures.
A is the head or block of the chuck having three (or more) recesses for the
reception of a corresponding number of tightly fitting guide-pins a. B is a ring
which is fitted upon the head A, the said ring being provided with a cylindrical
recess n for the reception of a worm m which loosely rests in the said recess n.
The said worm m engages with teeth m' cut on the circumference of the head A,
and is turned by means of a handle mul having an angular or square end which is
inserted into a corresponding hole in the worm m. The ring B, upon its inner
periphery, is provided with three (or more) longitudinal grooves b, which are
arranged nearly opposite to the guide-pins a in the head A. A suitable number
of lever-plates c, c, cl, which may be stamped out of steel plate or other suitable
metal by one and the same die or formed in any other suitable manner, and which
are provided with holes fitting the guide pins a, are alternately placed on these
guide-pins, one upon the other, in such a manner that the said guide-pins shall
act as pivots at their opposite ends; the said plates rest in the grooves b so
that they may be moved upon their pivots. Three or more of the said lever-
plates c, d, e, may be applied; the chuck shown in the drawing is represented
as containing ten of them. A cover or plate C is secured to the guide-pins a by
means of screws d. By these means the cover or plate C is securely held against
the lever-plates, thereby firmly keeping them in position and also securing the
ring B on the head A.
In order to allow of the ring B, with its worm which loosely rests in the
recess n, being placed upon the head A, the latter is partly cut away near
the worm-teeth 'm' as shown by dotted lines at mill Figure 2. By turning the
ring B so as to bring its recess n opposite to the opening m" of the head A,
the ring B may be slipped onto the head A, the projecting parts of the worm
entering the head at the said opening. By subsequently turning the worm m
by means of the handle m", the said worm is caused to engage with the worm-
teeth m² of the head A.
The position of the griping or clutching opening c of the chuck is determined
in the following manner, that is to say-By turning the handle m", the worm it,
engaging with the teeth ml, rotates the ring B around the head A which carries
the guide-pins a, thereby shifting the lever-plates o³, o, o, until they strike with
their rounded sides against the inner periphery of the ring B, as shewn in Figure 3;

page_text: while in this position a central hole is drilled through the cover or plate C and all
the lever plates c', c", c¹¹
In operation, the article to be held is inserted in the central hole e, the worm m
and the ring B are then turned by means of the handle m" and the lever-plates
c', c, c, which at one end are pivoted to the guide-pins a, are thereby moved 5
upon the said guide pins while their opposite ends are firmly held within the
grooves b upon the inner periphery of the ring B. The griping or clutching
opening is thus gradually and uniformly reduced by the lever-plates c', cl, c¹¹l, as
shown in Figure 4, so as to hold the article inserted with a firm grip.
The number of lever-plates may be varied to any desired extent, and their 1
arrangement may be changed by applying four or more guide-pins a and
grooves b.
The apparatus may also be used for other purposes, as, for instance, for
stretching wire which may simply be drawn through the reduced aperture, of the
chuck while the latter is in rotation. The lever-plates c³, o", c¹¹, which constitute 1
the main part of this invention, will then act on the wire in such a manner as to
press or beat it straight.
It will be seen that as the pins a are tightly driven or otherwise secured in the
sockets in the head A. and the cover or plate C is secured to the said pins and
adapted to extend over a portion of the ring B, the latter, while being free to turn 2
on the head A, will be held thereon.
Having thus fully described the said invention as communicated to me by my
Foreign correspondent, and the manner of performing the same, I wish it under-
stood that I claim.
First. The construction of a chuck with lever-plates cl, ol, clll, arranged 2
alternately in such a manner that when moved as above described they will close
simultaneously upon the article to be held, substantially as, and for the purpose,
set forth.
Second. In a chuck, the combination of the head A, with the ring B fitted to turn
upon the said head, and provided with a series of internal longitudinal grooves b, 3
the series of lever-plates cl, cl, cl, pivoted upon the pins a which are secured in
the head, and engaging with the said grooves, and means substantially as described,
for rotating the said ring, as, and for the purpose, specified.
Third. In a chuck, the combination, with the head A, of the ring B fitted to turn
upon the head, and provided with interual longitudinal grooves, the series of lever- 3
plates c', c, c, pivoted upon pins and engaging with the said grooves, the
worm m located within a recess in the ring and engaging with teeth upon the
head, and the covering plate C secured to the outer ends of the pins a and
extending over the ring so as to hold the same upon the head, substantially as
doscribed.
In Witness whereof I the said Henry Harris Lake, have hereunto set my
hand and seal this twenty seventh day of December in the year of our