A SPIRAL LEVER, OR ROTARY STANDARD PRESS
Year: 1821

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DAVID
BARCLAY, of Broad Street, in the City of London, Merchant, send greeting.
WHEREAS His most Excellent Majesty King George the Fourth did,
by His Letters Patent under the Great Seal of that part of the United
Kingdom of Great Britain and Ireland called. England, bearing date at
Westminster, the Twenty-sixth day of July, in the second year of His reign,
give and grant unto me;, the said David Barclay, my exors, adñors, and
assigns, His especial licence, full power, sole privilege and authority, that I,
the said David. Barclay, my exors, admors, and assigns, during the term of
years therein mentioned, should and lawfully, might make, use, exercise, and
vend, within England, Wales, and the Town of Berwick-upon-Tweed, and also
in all His Majesty's Colonies and. Plantations abroad; the Invention of "A
SPIRAL LEVER, OR ROTARY STANDARD PRESS," communicated to me, the said David
Barclay, by, a certain foreigner residing abroad; in which said Letters Patent
there is contained a-proviso, that if. I, the. said David Barclay, shall not
particularly describe and ascertain the nature of the said Invention, and in
what manner the same is to be performed, by an instrument in writing under
my hand and seal, and cause the same to be inrolled in His Majesty's High
Court of Chancery within six calendar months next and immediately after
the date of the said Letters Patent, that then the said Letters Patent, and
all liberties and advantages whatsoever thereby granted, shall utterly cease,

page_text: determine, and become void, as in and by the same, relation being thereunto
had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
David Barclay, do hereby describe and ascertain the nature of the said com-
munication, and an application of the same to a printing press, by the follow-
ing description thereof, reference being had to the Drawing and Figures
annexed (that is to say):-
That the communication doth consist in an improved press for printing,
copying letters, and other purposes where a great pressure is required to be
obtained with a small power, and which said improvement consists in so con-
structing that part of the press, which I call the standard of rollers, acting on
inclined planes, that the pressure is effected by drawing a wedge between two
rollers, while two spiral springs or levers return the wedge to its place; where-
fore, I have styled my said communication a spiral lever or rotary standard
press. The Drawing herein-after described shews the application of my said
communication to a printing press.
DESCRIPTION OF THE DRAWING.
Fig. 1 represents a general perspective view of the press, in order to shew
the relative positions of the herein-before mentioned improvements. A is the
cast-iron frame, to which the platen, the rotary standard, and the spiral levers
are attached; B is the common table rolled under the platen in the usual
manner by the rounce R travelling over and along the frame E; C is the rest
commonly used for receiving the frisket. It is not thought necessary to shew
the frisket in this Drawing, as I claim privilege only to the mode of obtaining
the pressure.
P is the platon; D, the situation of the rollers and inclined
planes constituting what I call the rotary standard; S, S, are the spiral levers
which raise the platen after each operation.
Fig. 2 represents the inclined planes and rollers which constitute what I call
the rotary standard. A is an inclined plane cast on or attached to the
top of
the platen, and elevated at that end which is towards the front of the press ;
B is another inclined plane cast on or attached to the frame of the press, and
has a contrary inclination downwards towards the front of the frame. In these
planes, at g, g, are two grooves or notches for purposes hereafter expressed.
R, R, are two rollers, which traverse along the inclined planes A and B, in
manner hereafter described. These rollers are furnished with a flange at each
end, projecting beyond the inclined planes, to keep them from shifting sideways
upon them. G is a wedge, having notches c, c, similar to and corresponding

page_text: with those at 9.9; this wedge has its base at the end h. In order to give the
pressure required, motion is given to the wedge by advancing it, by means of
the arm J, in the direction of the arrow K. This being done, the rollers will
rise out of the grooves and pass along the inclined planes A, B, while the
thickest part of the wedge coming under the rollers at the same time, the
platten becomes necessarily depressed to make room for it.
Fig. 3 is a representation of the same parts when the wedge has been
advanced, as before described. The grooves, it must be observed, are merely
to keep the wedge steady when the machine is at rest.
Fig. 4 is a back elevation of the press when at rest, the platten being repre-
sented as raised, the table not having been rolled under it. S, S, are the two
spiral levers which raise the platten to and keep it in this position.
Fig. 5 is a front elevation of the press, shewing the lever M, N, by which
the motion forward is given to the wedge; this may be done in various ways;
but as I do not claim any exclusive privilege to this lever I shall simply
describe two modes of operating with it :-One is with a quadrant at the end
M of the lever, over which passes a chain, one end of the said chain being
attached to the lever, and the other end to the part of the wedge marked II in
Figure 2; the other mode is that represented in this Figure (Fig. 5), for the
explanation of which I have given a plan of the same in the next Figure, and
marked the corresponding parts with corresponding letters.
Fig. 6 is a plan of the lever. The long arm M, N, turns on a pivot at M,
which is fixed into an arm projecting from the framework at some distance
for that purpose. The shorter arm O turns on a pivot attached to the frame-
work at O, while the wedge is attached to the middle diagonal bar at X. By
this arrangement it will be seen that when the long arm is moved in the direc-
tion of the arrow T, the wedge will be drawn forward in a perfectly straight
direction.
Fig. 7 is a side elevation of the press.
Now, a press for printing, copying letters, and other purposes, as aforesaid,
so constructed with rollers acting on inclined planes, as aforesaid, being, to
the best of my knowledge and belief, entirely new and never before practised
in this kingdom, I am desirous to maintain this my exclusive right and
privilege to the same.
In witness whereof, I, the said David Barclay (party hereto), this
Twenty-sixth day of January, in the year of our Lord One thousand
eight hundred and twenty-two.
DAVID (L.S.) BARCLAY.

page_text: AND BE, IT REMEMBERED, that on the Twenty-sixth day of January;
in the year of our Lord 1822, the aforesaid, David Barclay came before our
said Lord the King in His Chancery, and acknowledged the Specification afore-
said, and alliand every thing therein contained and specified, in form above
written. And also the Specification "aforesaid was stamped according to the
tenor of the Statute made for that purpose.
Inrolled the Twenty-sixth day of January, in the year of our Lord One
thousand eight hundred and twenty-two.