IMPROVEMENTS IN PRINTERS' QUOINS
Year: 1880

page_text: LETTERS PATENT to Herbert John Haddan, of the Firm of Herbert and
Company, Solicitors of Patents, of 67, Strand, in the City of Westminster,
Civil Engineer, for an Invention of "IMPROVEMENTS IN PRINTERS' QUOINS."
A communication from abroad by John Young, of Montreal, in the Dominion
Canada
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at the
Office of the Commissioners of Patents on the 13th October 1880.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors of
Patents, of 67, Strand, in the City of Westminster, Civil Engineer. "IMPROVEMENTS
IN PRINTERS' QUOINS." A communication from abroad by John Young, of
Montreal, in the Dominion of Canada.
This Invention relates to a quoin composed of two pieces, consisting of a box
and rock bar. The box is made of a slightly tapering wedge form, its upper end
and lower sides being parallel; two recesses are formed in the upper and lower sides
of the box of suitable form to admit a pinion key to freely revolve in the same,
and in proper working contact with the teeth on the inner face of the said wedge
rock bar. The teeth of the latter are formed in the centre and project from the
inner face of the rock bar; they are extended the entire length of the bar, and the
length of the teeth is sufficiently less than the width of the bar to leave bearings
on the inner face, which bearings slide on the contiguous faces formed on the upper
and lower sides of the inner face of the box, allowing the rack teeth to pass along
in the trunk of the box. I use a very slight taper of about two degrees for those
parts of the box and rock bar which slide upon each other, whereby I secure perfect
stability after locking up, and the effort required to operate the quoin is reduced to
a miuimum.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Herbert John Haddan in the Great Seal Patent Office on the 4th
April 1881.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors of
Patents, of 67, Strand, in the City of Westminster, Civil Engineer. "IMPROVEMENTS
IN PRINTERS QUOINS." A communication from abroad by John Young, of
Montreal, in the Dominion of Canada.
"
This improvement has reference to that class of printers' material known as
quoin," and is used in various ways for the purpose of locking up forms for use
in the press.
Numerous devices have been introduced for this purpose with indifferent success;
the requirements are rapidity in operation, perfect security in locking up, and
occupation of the least possible space; these are absolutely essential and are
embodied in my improvements which will proceed to describe.
Figure 1 shews the combination of the different parts ready for the locking up
process.
Figure 2 represents the inner face of the rack bar.
Figure 3 shows the inner face of the box with a sectional view of the same.
Figure 4 shows the pinion key.
This quoin is composed of two pieces, consisting of a box A and rack bar B.
The box A is made of a slightly tapering wedge form, its upper end and lower
sides being parallel; recesses c, c, are formed in the upper and lower sides of the
box, of suitable form, to admit the pinion key C to freely revolve in the same, and
in proper working contact with the teeth e, e, e, e, on the inner face of the wedge
rack bar B.
The teeth e, e, e, e, are formed in the centre and project from the inner face of
the rack bar B, they are extended the entire length of the bar and the length of
the teeth e, e, e, e, is sufficiently less than the width of the bar to leave bearings
g, g, on the inner face, which bearings slide on the contiguous faces f, f, formed on
the upper and lower sides of the inner face of box A, allowing the rack teeth to
pass along in the trunk of the box.
It will be observed that I use a very slight taper of about two degrees, by means
of which I secure perfect stability after locking up, and the effort required to
operate the quoin is reduced to a minimum.
Mode of Using-Place the two pieces A and B together, the thin ends
"
a, b,"
of the inner faces in contact, push up the rack until the teeth "e, e," appear in the
upper most recess "c," enter the key C, which will engage with the teeth "e, e,"
turn the key so as to expand the quoin until a suitable pressure is obtained, when
the key is withdrawn.
Claims,-
<<
1st. The taper box A with the recesses c, c," substantially as described.
2nd. The taper box A in combination with the taper rack bar B and pinion
key C, substantially as and for the purpose set forth.
In witness whereof, I, the said Herbert John Haddan, have hereunto set my
hand and seal, this Fourth day of April, A.D. 1881.