Year: 1887

page_text: Date of Application, 15th Oct., 1887
Specification Accepted, 15th Nov., 1887
[Communicated from abroad by JOHN M. HAWKES, of New York, in the County
and State of New York, United States of America.]
I, SAMUEL SIDNEY BROMHEAD of 97, Newgate Street, London, E.C., Patent
Agent, (communicated), 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 statement :-
The object of my invention is to provide a new and improved metallic printing
block, in which Electrotype and Stereotype plates can be firmly locked in position or
released from the same at the will of the operator.
The invention consists in the construction and arrangement of various parts and
details, and combinations of the same, as will be fully described hereinafter, and
then pointed out in the claim.
Reference is to be had to the accompanying drawings forming a part of this speci-
fication, in which similar letters of reference indicate corresponding parts in all the
figures.
Figure 1 is a bottom view of a printing block provided with my improvement and
showing the same in a locked position.
Figure 2 is a sectional side elevation of the same on the line x-x of Figure 1
looking in the direction of the arrow x¹.
Figure 3 is a bottom view of part of a printing block showing the parts in an open
position.
Figure 4 is a face view of the printing block showing the electro plate in position
with parts broken out.
Figure 5 is a sectional side elevation of the same on the line y―y of Figure 1
looking in the direction of the arrow y¹ ; and
Figure 6 is a sectional end elevation of the same on the line -- of Figure 1.
The printing block A, of suitable size and form, is provided on its upper face (see
Price 8d.1

page_text: '
Figure 4) on one side and on one end, with one, two or more fixed clamps B ; and on
the other side of the block A, with one, two or more, movable clamps C, which
project above the upper surface of the block and move in grooves D cut in the said
block; and on the other end are placed one or more movable clamps E which are of
similar construction to the clamps C, and move in the grooves D¹ of the block A.
The movable clamps are each secured to one end of a rod F adapted to slide
in suitable bearings formed below the face of the block A, and from the rod F, near its
other end, projects a pin or lug F1, against which rests one end of the spring Ġ formed
of one piece of spring wire coiled around suitable bolts H held on the bottom of the
block A. Each of the movable clamps C is provided with a downwardly extending
lug I, against which rests one end of the bell-crank lever J, pivoted at J¹ to the
bottom of the block A, and pivotally connected with a bar or rod K, which connects
the bell-crank-lever J on one clamp C with the other bell-crank-lever of the next
following clamp C..
To one of the bell-crank-levers J is pivotally attached a link L which connects with
the arm M, secured to a post N, placed in one corner of the block A, and provided
with a square recess N¹, into which fits a key having a handle, and inserted into the
said square recess N¹ from the face of the block A.
0
The clamp E is secured to one end of a rod sliding in suitable bearings formed
on the bottom of the block A and provided with a pin O' against which rests one end
of the spring T coiled around the bolt S held on the bottom of the block A, and the
other end of the said spring T rests against the rib A¹ of the block A. The other end
of the rod O, operates one arm of the bell-crank-lever U pivoted at U¹ to the bottom
of the block A and connected by its other arm, by means of a link V, with one of the
bell-crank-levers J.
The operation is as follows:-
In the position shown in Figure 4, the movable clamps and E are in an inner
position, holding the plate W firmly on the face of the block A. If it is desirable to
release the plate W from the clamps C and E, then the operator inserts the key into
the square recess N¹ in the post N and turns the latter in the direction of the arrow a¹
until its arm M rests against the first bell-crank-lever J as shown in Figure 3. This
motion of the arm N forces the bell-crank-levers J to swing outward by the action
of the connecting links L and K, and the outer end of the levers J pressing against
the lugs I cause the clamps C to slide outward, and thereby release the plate W at one
side.
At the same time that the clamps C commence to move the clamps E also moves
outward by the action of the bell-crank-lever U on the rod O carrying the said
clamp E, and the said bell-crank-lever U being set in motion by the link V con-
necting the said bell-crank-lever U with one of the moving bell-crank-levers J.
It will be seen that by the simultaneous outward movement of the clamps C and E
the springs G and T respectively are compressed, and as the link L is thrown beyond
the center line, as shown in Figure 3, the tension of the said springs is indirectly
exerted against the arm M in the direction of the arrow a', so that when the
operator removes the key from the posts N, the clamps C and E remain in their outer
postion.
When the clamps C and E are opened, the plate W can be easily removed from the
page of the block A, and when the plate W is to be locked in position, then the operator
turns the post N by means of the key, in the inverse direction of the arrow a¹, until L
has passed its center line with the posts N. The springs G and T then commence
to act and force the clamps C and E inward in contact with the plate W, which is
thus securely held on the face of the block A.
Having now fully described and ascertained what my said Invention is and how
the same is constructed and performed, as communicated to me by my foreign corre-
.spondent. I do hereby declare that what I claim as my Invention and desire to secure
by Letters Patent is,
1. In a metallic printing block, the combination with the post N, having the arm M,

page_text: of the link L connecting the said arm M with the lever J, the lever pivoted on the
block A, the clamp C having the projection I, and the rod F operating against the
spring G, substantially as shown and described.
2. In a metallic printing block, the combination with the levers J actuated from
the post N, of the link K connecting the said bell-crank-levers J with each other, the
clamps C, each having a projection 1, the rods F each provided with a pin F', and
the spring G actuating on the said pins F, substantially as shown and described.
3. In a metallic printing block, the bell-crank-levers J, the link V, and the bell-
crank-lever U, in combination with the rod O, provided with the pin O¹, the spring T
acting on the pin of the said rod O, and the clamp E held on the said rod O,
substantially as shown and described.
4. In a metallic printing block, the movable clamps C and E, the rods F and O,
carrying the said clamps C and E respectively, and the springs G and T, operating on
the said rods F and O, in combination with the bell-crank-levers J and U, the link K
connecting the said levers J with each other, the post N having the arm M, the
link L connecting one of the levers J with the said arm M, and the link V connecting
the other lever J with the said bell-crank-lever U, substantially as shown and
described.
5. In a metallic printing block, the combination with the block A, and the
stationary clamps B, formed on the face of the said block A, of the movable
clamps and E, sliding in grooves in the said block A, the rods F and O, carrying
the said clamps C and E, the springs G and T operating on the said rods F and O,
the bell-crank-lever U operating on the said clamps C, the link K connecting the said
bell-crank-lever J with each other, the link V connecting one of the bell-crank-levers J
with the said bell-crank-lever U, the link L pivotally connected to one of the bell-
crank-levers J, the arm M pivotally connected with the said link L and the post N
carrying the said arm M and mounted on the said block A, substantially as shown and
described.