Improvements in or relating to Printing Plate Holders.
Year: 1899

page_text: Date of Application, 21st July, 1899
Complete Specification Left, 14th Apr., 1900-Accepted, 2nd June, 1900
PROVISIONAL SPECIFICATION.
Improvements in or relating to Printing Plate Holders.
A communication by STEPHEN MAYBELL and MARY MAYBELL, both of San
Francisco, in the County of San Francisco and State of California, United
States of America.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester,
both in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, and 322, High Holborn, in the County of Middlesex, Civil Engineer,
do hereby declare the nature of this invention to be as follows;
The invention relates to an improved printing plate holder, the object of the
invention being to provide a device whereby an electrotype, stereotype or printing
plate may be instantly attached to or removed from the block for the purpose of
printing.
In carrying the invention into practice, a suitable block of wood is employed,
to one end of which is fixedly secured a vertical stop plate, whose edge projects
a sufficient height above the surface of the block to form a stop or rest for the
end of the printing plate. To the side of the block is secured a vertical clamp
plate, the edge of which rises above the surface of the block like that of the
plate, said edge having a longitudinal V-shaped groove adapted to receive the
beveled edge of the printing plate and hold said plate, when pressed against it
laterally firmly down to the block. The upper edge of said groove is notched
to form a roughened clamping edge to bear against the edge of the printing
plate, furnishing additional prevention against slipping of said plate. Supporting
said clamp is a spring formed into two coils encircling a pivot rod, the latter
being passed longitudinally through the block and intersecting the recesses and
middle portion; which spring between its two coils is formed into an arm which
rests on the surface of the block at the bottom of the corresponding recesses,
and the ends of the spring are held by the edges of a sheet metal clamp bent
over said ends, said ends being finally bent back on themselves.
It will now be seen that a downward pressure on the clamps compresses the
springs and removes the clamping edges from the edge of the printing plate
permitting the latter to be raised from the block. The arrangement of the spring
encircling the rod, and its arm resting on the surface causes a strong pressure
to be exerted by the clamping edges upon the edge of the printing plate. This
pressure is exerted both downwardly and forwardly, thus forcing the plate against
the opposite clamping plate and holding the printing plate firmly in position.
e T..l.. 1900

page_text: Improvements in or relating to Printing Plate Holders.
A communication by STEPHEN MAYBELL and MARY MAYBELL, both of San
Francisco, in the County of San Francisco and State of California, United
States of America.
I WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester,
both in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, & 322, High Holborn, in the County of Middlesex, Civil Engineer,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
+1
statement:-
This invention relates to an improved printing. plate holder, the object of the
invention being to provide a device whereby an electrotype, stereotype or
or printing
plate may be instantly attached to or removed from the block for the purpose of
printing.
1
.*1.e
The invention therefore resides in the novel combination, construction and
arrangement of parts for the above end, hereinafter fully specified and particularly
pointed out in the claims.
In the accompanying drawing,
Figure 1 is a plan view of the device,
Figure 2 is an end view thereof,
::
.:
Figure 3 is a cross-section, on an enlarged scale, the central portion being
broken away, and
Figure 4 is a view of the under side of one of the clamps.
....
1 represents a suitable block of wood, to one end of which is fixedly secured a
vertical stop-plate 2, whose edge projects a sufficient height above the surface
of the block to form a stop or rest for the end of the printing plate 3. To the
side of the plate 1 is secured a vertical clamp plate 4, the edge of which rises
above the surface of the block in like manner as that of plate 2, said edge having
a longitudinal V-shaped groove 5 adapted to receive the bevelled edge 6 of the
printing plate and hold said plate, when pressed against it laterally, firmly down
to the block. The upper edge of said groove is notched, as shown at 7, to form
a roughened clamping edge to bear against the edge of the printing plate, furnish-
ing additional prevention against slipping of said plate.
The block 1, on the side opposite to the plate 4, is recessed, as shown at 9,
to receive the clamps 10. Each clamp is formed of a piece of sheet metal having
its inner edge bent upwards, as shown at 11, and then obliquely outwards from
the body of the clamp, as shown at 12, said edge 12 being thus adapted to rest
upon and grip the bevelled edge of the printing plate. Supporting each clamp 10
is a spring 13 formed into two coils 14 encircling a pivot rod 15, the latter being
pressed longitudinally through the block and intersecting the recesses 9. The
middle portion of each spring 13, between its two coils is formed into an arm 16
which rests on the surface 17 of the block at the bottom of the corresponding
recess, and the ends 18 of the spring are held by the edges of the sheet, metal
clamp, bent over said ends, as shown at 19, said ends being finally bent back
on themselves, as shown at 20.
1
1.
It will now be seen that a downward pressure on the clamps 10 compresses the
springs 13 and removes the clamping edges 12 from the edge of the printing
plate, permitting the latter to be raised from the block. The arrangement of
the spring 13, encircling the rod 15, and its arm 16 resting on the surface 17.

page_text: auses a strong pressure to be exerted by the clamping edges 12 upon the eage
of the printing plate. This pressure is exerted both downwardly and forwardly,
bus forcing the plate against the opposite clamping plate 4 and holding the
printing plate firmly in position.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated
to me by my foreign correspondents I declare that what I claim is:-
1. The combination of a block, a clamp plate secured on one side thereof having
a longitudinal bevelled edge above the surface of the block, a pivot rod longi-
tudinally arranged on the opposite side of the block, said block having a recess
intersected by said rod, a spring coiled around said rod, and having a stationarily
supported arm, and a clamp supported by and movable with a free end of said
spring. said clamp having on its inner side towards said block an oblique edge
adapted to exert pressure upon the bevelled edge of a printing plate on said block,
substantially as described.
2. The combination of a block, a clamp plate secured on one side thereof having
a longitudinal bevelled edge above the surface of the block, a pivot rod longi-
tudinaly arranged in the opposite side of the block, said block having a recess
intersected by said rod, a spring having its middle portion formed into a sta-
tionarily supported arm, said spring, on each side of said middle portion, being
coiled around said rod, and its free ends extended outwardly from said rod and
block, and a clamp formed of a piece of sheet metal having its edges bent around
said free ends and its intermediate edge hent upwards and obliquely outwards
from the clamp, substantially as described.
3. The combination of a block having a plurality of recesses on one side, a
clamp plate secured on the other side thereof having a longitudinal bevelled edge
above the surface of the block, a pivot rod passed longitudinally through said
block intersecting said recesses, a spring coiled around said rod in each recess,
the middle portion of said spring forming a stationarily supported arm, and a
clamp in each recess secured upon the free end of the spring therein, said clamps
being formed of sheet metal plates bent upwards and then obliquely to bear upon
the edge of a printing plate on said block, substantially as described.