IMPROVEMENTS IN LITHOGRAPHIC OR ZINCOGRAPHIC PRESSES
Year: 1862

page_text: LETTERS PATENT to Frederick Dangerfield, of Bedford Street, in the
City of Westminster, Lithographer, for the Invention of "IMPROVEMENTS
IN LITHOGRAPHIC OR ZINCOGRAPHIC PRESSES."
Sealed the 17th October 1862, and dated the 24th April 1862.
PROVISIONAL SPECIFICATION left by the said Frederick Dangerfield
at the Office of the Commissioners of Patents, with his Petition, on the
24th April 1862.
I, FREDERICK DANGERFIELD, of Bedford Street, in the City of Westminster,
Lithographer, do hereby declare the nature of the said Invention for "IM-
PROVEMENTS IN LITHOGRAPHIC OR ZINCOGRAPHIC PRESSES," to be as follows:-
My improvements are as bereafter described. I reverse the ordinary
method, and place the cylinder at the top in the frame, and the scraper box
beneath. I construct the bed of the press to turn over on a hinge or joint
towards the printer; the plate or block, or surface to be printed from is fixed
to the bed so turning, and the tympan is stretched beneath the bed frame, and
fills the space into which the bed will turn. By these means, and by using .a
tumbler eccentric acting beneath the scraper box, for the purpose of obtaining
and throwing off the pressure, I am enabled to work this press by forward
and backward motion, that is, the bed passes beneath the pressure and out on
the other side, the surface is there again prepared by the printer for printing
on its return motion. The pressure is obtained and thrown off by bolts which
slide in a groove, so that they can be adapted to fix according to the size of

page_text: the work required to be printed on any particular spots in the side of or on
the edge of the bed frame, the bolts acting by the passage of this frame and
bed beneath the cylinder on the tumbler eccentric before mentioned, exert or
remove the pressure on the spots so marked by these bolts. The frame and
bed are forced beneath the cylinder by means of a rack and pinion attached
to the bed frame and the cylinder, the latter being made to revolve by a
handle, as in ordinary lithographic presses. Lastly, I fix the inking slab on
the top of the press over the cylinder, the sides of the press being made flat
on the top for such fixture.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Frederick Dangerfield in the Great Seal Patent
Office on the 24th October 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FREDERICK
DANGERFIELD, of Bedford Street, in the City of Westminster, Lithographer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fourth day of April, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-fifth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Frederick Dangerfield, Her special licence, that I, the said
Frederick Dangerfield, my executors, administrators, and assigns, or such
others as I, the said Frederick Dangerfield, my executors, administrators,
and assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN LITHOGRAPHIC OR ZINCOGRAPHIC PRESSES,"
upon the condition (amongst others) that I, the said Frederick Dangerfield,
my executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Frederick Dangerfield, do hereby
declare the nature of my said Invention, and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by the
following statement thereof, reference being had to the Drawings hereunto
annexed (that is to say) :-
;
My improvements are as hereafter described. I reverse the ordinary
method, and place the cylinder at the top in the frame, and the scraper box
beneath. I construct the bed of the press to turn over on a hinge or joint by
the printer the plate or block, or surface to be printed from is fixed to the
bed so turning, and the tympan is stretched beneath the bed frame, and fills
the space into which the bed will turn. By these means, and by using a
tumbler eccentric acting beneath the scraper box, for the purpose of obtaining
and throwing off the pressure, I am enabled to work this press by forward
and backward motion, that is, the bed passes beneath the pressure and out on
the other side, the surface is there again prepared by the printer for printing
on its return motion. The pressure is obtained and thrown off by bolts which
slide in a groove, so that they can be adapted to fix according to the size of
the work required to be printed on any particular spots in the side of or on
the edge of the bed frame, the bolts acting by the passage of this frame and
bed beneath the cylinder on the tumbler eccentric before mentioned, exert or
remove the pressure on the spots so marked by these bolts. The frame and
bed are forced beneath the cylinder by means of a rack and pinion attached to
the bed frame and the cylinder, the latter being made to revolve by a handle,
as in ordinary lithographic presses. Lastly, I fix the inking slab on the top
of the press over the cylinder, the sides of the press being made flat on the top
of such fixture.
Figure 1 of the accompanying Drawings is a plan or top view showing the
bed closed, and with the ink slab removed; Figure 2 is an end view, and
Figure 3 is a side elevation of a press constructed according to my Invention.
a is the printing cylinder, mounted on a shaft b, free to revolve in bearings
formed in the frame of the press. The shaft carries a toothed wheel c in
gear with a pinion d; e is a crank handle on the axis of the pinion d, for
communicating rotary motion to the printing cylinder; f is a rack on the bed
frame, into which the wheel c¹ gears, and whereby alternate to-and-fro motion
is imparted to the bed frame. The hinged portion or lid f¹ of the bed frame
is free to turn over on hinges 9, 9, and when so turned rests on a support or
supports h projecting from the side of the fraine. The stone plate or surface
to be printed from is placed on and secured to the under side of the lid f',
and the paper or other material is placed on the tympan beneath. The
printing surface is inked from the slab i, and turned over on the paper and
tympan; k, k, are bolts secured to one side of the bed frame, their distance

page_text: apart being adjusted according to the length of the printing surface; 7 is an
eccentric or cam beneath the scraper box m, by which the pressure is thrown
on and off. Now, by turning the handle e, and thus communicating motion
to the press, the bed frame is caused to travel by means of the toothed
gearing and rack beneath the printing cylinder a, and as soon as the bolt k
acts against the eccentric the pressure from the scraper and cylinder is
obtained and maintained until the second bolt reaches the eccentric, when
the pressure is released, and the bed frame is on the opposite side of the
machine. At this point the lid is raised, the printing surface newly inked,
fresh paper placed on the tympan, the parts returned to the position before
described, and the frame is caused to travel back in the reverse direction, the
bolt then putting on the pressure, and the bolt k taking it off.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim as my "Improve-
ments in Lithographic or Zincographic Presses," placing the printing cylinder
over and the scraper box under the bed, which is made to turn over to move
to and fro, and to receive pressure from the scraper by means of bolts acting
against an eccentric or cam, all substantially in manner and for the pur-
poses herein before described and illustrated in the accompanying Drawings.
In witness whereof, I, the said Frederick Dangerfield, have hereunto
set my hand and seal this Twenty-third day of October, One thousand
eight hundred and sixty-two.
FREDERIC DANGERFIELD. L.S.)