IMPROVEMENTS IN JOINTED RULES
Year: 1867

page_text: LETTERS PATENT to Alfred Bradburn, of Birmingham, in the County of
Warwick, Rule Manufacturer, and Samuel Thomas Marsh, of the same
Place, Rule Maker, for the Invention of "IMPROVEMENTS IN JOINTED
RULES."
Sealed the 27th March 1868, and dated the 5th October 1867.
PROVISIONAL SPECIFICATION left by the said Alfred Bradburn and
Samuel Thomas Marsh at the Office of the Commissioners of Patents,
with their Petition, on the 5th October 1867.
We, ALFRED BRADBURN, of Birmingham, in the County of Warwick, Rule
Manufacturer, and SAMUEL THOMAS MARSH, of the same Place, Rule Maker,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
JOINTED RULES," to be as follows:―
Our Invention consists in providing a means whereby jointed rules, whether
single, double, or of more folds, may be fixed and set rigidly to any desired
angle, or to form a straightedge. This is effected, for instance, in the case
of a single jointed rule, by the employment of a slide or bolt working by
means of a slot upon suitable pins or guides, and this slide or bolt is attached
upon one of the inner edges of the rule so as to slide in and out of the jointed
portion, which is suitably recessed at given angles for such purpose, a thumb
piece or other similar means being provided for actuating the slide or bolt.

page_text: In applying our Invention to rules having a number of joints or folds we can
use such number of these slides or bolts as may be requisite.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by tho said Alfred Bradburn and Samuel Thomas Marsh in the
Great Seal Patent Office on the 3rd April 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ALFRED
BRADBURN, of Birmingham, in the County of Warwick, Rule 'Manu-
facturer, and SAMUEL THOMAS MARSH, of the same Place, Rule Maker, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifth day of October, in the year of our Lord One
thousand eight hundred and sixty-seven, in the thirty-first year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
Alfred Bradburn and Samuel Thomas Marsh, Her special license that we,
the said Alfred Bradburn and Samuel Thomas Marsh, our executors, adminis-
trators, and assigns, or such others as we, the said Alfred Bradburn and
Samuel Thomas Marsh, our 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 JOINTED RULES," upon the condition (amongst others),
that we, the said Alfred Bradburn and Samuel Thomas Marsh, by an
instrument in writing under our 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 we, the said Alfred Bradburn and Samuel Thomas
Marsh, do hereby declare the nature of our said Invention, and in what
manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement, reference being had to the Drawings
hereunto annexed, and to the letters and figures marked thereon (that is to
say):-

page_text: Our Invention consists in providing a means whereby jointed rules whether
single, double, or of more folds may be fixed and set rigidly to any desired
angle, or to form a straightedge. This is effected, for instance, in the case
of a single jointed rule, by the employment of a slide or bolt working by
means of a slot upon suitable pins or guides, and this slide or bolt is attached
upon one of the inner edges of the rule, so as to slide in and out of
the jointed portion, which is suitably recessed at given angles for such
purpose, a thumb piece or other similar means being provided for actuating
the slide or bolt. In applying our Invention to rules having a number of
joints or folds we can use such number of these slides or bolts as may be
requisite.
:
The nature of our Invention will be more readily understood by referring to
the annexed Drawings in which our improvements are shewn as applied to a
single jointed rule.
Figure 1 represents a portion of a rule closed; Figure 2, the rule expanded
or opened outwards, and set to form a straight edge; Figure 3 shewing it
set to form a right angle.
(a) is the slide or bolt which is partly recessed into and works upon one
of the inner edges of the rule, and it is formed as shewn detached in top, side,
and under side views in Figure 4 with a slot (b), which receives a rivet
pin or pins passing through it and secured in the rule, upon which pin or
pins the bolt or slide (a) works, such pin or pins also serving to keep tho
bolt (a) in position; a thumb bit (c) or other similar or suitable means is
provided for actuating the slide or bolt (a), one end of which slides in and
out of the jointed portion of the rule (d) which is suitably recessed at given
angles for such purpose as, for instance, at (e), the angles being indicated
upon the joint as shewn. If preferred we construct the slide or bolt, as
shewn in an open inner edge view at Figure 5, by forming pins or guides (ƒ)
upon which works the slide or bolt (9), which is suitably recessed for such
purpose.
In the application of our Invention to rules having a number of joints or
folds we propose to use such number of these slides or bolts as may be found
requisite.
Having thus described the object and nature of our said Invention, and
the manner in which the same is to be carried into effect, we wish it to be
understood that without limiting ourselves to the precise details of the various
parts as described and shewn, we claim, the method whereby jointed rules
may be fixed or set rigidly at their folding joints to any desired angle or to

page_text: form a straight edge by means of bolts or slides, substantially in manner
herein more fully set forth and specified.
In witness whereof, we, the said Alfred Bradburn and Samuel Thomas
Marsh, have hereunto set our hands and seals, this Thirtieth day of
March, in the year of our Lord One thousand eight hundred and
sixty-eight
ALFRED BRADBURN.
(L.S.)
SAMUEL THOMAS MARSH. (L.B.)