IMPROVEMENTS IN THE MANUFACTURE OF FILES FOR FILING LETTERS INVOICES AND PAPERS
Year: 1885

page_text: invoices, апа гарегв.
We THOMAS WALKER of Brook Street Saint Paul's Birmingham in the County
of Warwick Manufacturer and WILLIAM MICHAEL PERRY of No 29 Brougham
Street Aston near Birmingham aforesaid Tool Maker do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN THE MANUFACTURE OF FILES FOR
FILING LETTERS INVOICES AND PAPERS". to be as follows:-
Our invention has reference to the metallic parts of letter files of the kind
commonly known as "apronfiles." The holding parts of these files consist of a
divided wire loop the lower fixed half being secured to a metal base plate and the
latter, to a millboard or other strong back and the upper half loop being connected
to a lever which is jointed to the said base plate near its top.
Our invention consists in making from sheet metal in the manner hereinafter
described the lever of the jointed upper half loop the knuckles by which it is
jointed to the base plate and the spring by which the lever is held in its open and
closed positions respectively.
In making the lever of the jointed half loop according to our invention we
cut out from sheet brass or other hard and ductile metal or alloy a blank having
a length somewhat greater than the lever to be, made the lower half of the blank
being narrower than the upper half. We make by press tools across the narrow
lower half of the blank where it joins the broad upper part a hollow knuckle
which forms the middle knuckle of the joint. The narrow part of the blank
beyond the knuckle is next doubled or folded backwards so as to form a curved
heel piece or stop to the lever The bend of this heel piece or stop is rounded and
is situated above the joint on which the lever turns. The broad part of the blank
above the knuckle is curved outwards and constitutes the thumb plate of the
lever. The upper half loop is rivetted to the thumb plate end of the lever in the
ordinary way.
The side knuckles between which the middle knuckle of the lever fits are made
from the sheet metal base plate which is secured to the millboard or other back of the
letter file. The said side knuckles are made from narrow strips or tongues pierced
out of the base plate bending the said strips or tongues outwards and giving a
tubular figure to their extreme ends. The middle knuckle of the lever being
fitted between the side knuckles on the base plate the joint is completed by means

page_text: of a joint pin. The spring which bears upon the heel part of the lever for holding
the upper half loop in its open or closed position is made from the middle of the
base plate. Near the free end of the spring is a depression into which the upper
end or bend of the heel part of the lever snaps. When the jointed half loop is
closed the extreme end of the spring bears upon the back of the heel piece or stop
near its top the bottom of the said heel piece or stop bearing against the base plato
and limiting the motion of the lever.
A frame like opening or eye is pierced out at the upper end of the sheet metal
base plate for banging the letter file upon a nail or other support.
Invoices, and rapers,
We THOMAS WALKER of Brook Street, Saint Pauls, Birmingham in the County
of Warwick, Manufacturer and WILLIAM MICHAEL PERRY of No 29 Brougham
Street, Aston near Birmingham aforesaid, Tool Maker, do hereby declare the nature
of our Invention for "IMPROVEMENTS IN THE MANUFACTURE OF FILES FOR
FILING LETTERS, INVOICES AND PAPERS" and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement: -
"
Our invention has reference to the metallic parts of letter files of the kind
commonly known as Apronfiles." The holding parts of these files consist of a
divided wire loop the lower fixed half being secured to a metal base plate and the
latter to a millboard or other strong back and the upper half loop being connected
to a lever which is jointed to the said base plate near its top.
Our invention consists in making from sheet metal in the manner herein after
described the lever of the jointed upper half loop, the knuckles by which it is
jointed to the base plate and the spring by which the lever is held in its open and
closed positions respectively.
In making the lever of the jointed half loop according to our invention we cut
out from sheet brass or other hard and ductile metal or alloy a blank having
a length somewhat greater than the lever to be made, the lower half of the
blank being narrower than the upper half. We make by press tools across the
narrow lower half of the blank, where it joins the broad upper part, a hollow
knuckle which forms the middle knuckle of the joint. The narrow part of the
blank beyond the knuckle is next doubled or folded backwards so as to form

page_text: a curved heel piece or stop to the lever. The bend of this heel piece or stop
is rounded and is situated above the joint on which the lever turns. The broad
part of the blank above the knuckle is curved outwards and constitutes the
thumb plate of the lever. The upper half loop is rivetted to the thumb plate
end of the lever in the ordinary way. The side knuckles between which the
middle knuckle of the lever fits are made from the sheet metal base plate which
is secured to the millboard or other back of the letter file. The said side knuckles
are made from narrow strips or tongues pierced out of the base plate, bending
the said strips or tongues outwards and giving a tubular figure to their extreme
ends. The middle knuckle of the lever being fitted between the side knuckles
on the base plate, the joint is completed by means of a joint pin. The spring
which bears upon the heel part of the lever for holding the upper half loop in
its open or closed position is made from the middle of the base plate. Near
the free end of the spring is a depression into which the upper end or bend of the
heel part of the lever snaps. When the jointed half loop is closed the extreme end
of the spring bears upon the back of the heel piece or stop near its top, the bottom
of the said heel piece or stop bearing against the base plate and limiting the
motion of the lever.
A frame like opening or eye is pierced out at the upper end of the sheet metal
base plate for hanging the letter file upon a nail or other support.
Figure 1 represents in side elevation; Figure 2 partly in side elevation and
partly in section and Figure 3 in front elevation, the metallic parts of an apron file
for filing letters invoices and papers, the said metallic parts being made according
to our invention.
In Figures 1 and 3 the jointed half loop is represented closed upon the lower
fixed half loop and in Figure 2 the jointed half loop is represented raised from the
lower fixed half loop.
a is the sheet metal base plate which is secured to the millboard or other strong
back of the letter file; b is the fixed half loop riveted to the base plate a; c is the
spring made in one piece with the base plate a for holding the lever of the file in
its open and closed position respectively; d is the opening or eye at the upper end
of the base plate a by which the letter file is suspended; e is the lever carrying
the upper half loop f of the file the said lever being jointed at g to the base plate a,
the joint pin being passed through the side knuckles h, h on the base plate a and
through the middle knuckle i on the lever e, which middle knuckle is fitted between
the said side knuckles h, h; e' is the thumb piece of the lever e and k is the curved
heel piece or stop made in one piece with the levere the upper end or bend of
which heel piece, when the lever is opened, snaps into a depression in the
spring c (see Figure 2). When the half loop f is closed upon the half loop the
extreme end of the spring c bears against the back of the heel piece or stop k near
its top the wide bottom of the heel piece or stop bearing against the base plate a
(see Figure 3) and limiting the motion of the lever.
I make the lever of the file from sheet metal in the manner represented in
Figures 4, 5 and 6. That is to say I cut from sheet metal (preferably brass) a
blank having the shape represented in Figure 4 and pierce in it the bole / in which
the upper half loop is to be riveted. From the narrow lower part of the blank
where it joins the broad part, the hollow middle knuckle i of the joint of the lever
is made by press tools. The lower part of the blank is next doubled or bent back-
wards so as to form the curved heel piece or stop of the lever. The top of the
broad part of the blank is finally bent or curved outwards to form the thumb
plate e of the lever.
In making the base plate a and its knuckles and spring, I form from sheet metal
(preferably brass) by cutting out and piercing tools, a blank of the kind repre-
sented in Figure 7. From the narrow strips or tongues h², h² of the blank the
side knuckles h, h are made by bending the said strips outwards and giving
a tubular figure to their extreme ends and from the wider middle strip c* the
spring c, c is made..

page_text: Figure 8 represents in front elevation; Figure 9 in end elevation; Figure 10 in
side elevation and Figure 11 in section, taken through the spring, the pierced
blank Figure 7 after the side knuckles h, h of the lever joint and the spring c, c³
have been fashioned from the strips h², h² and c³. It will be seen by an examina-
tion of Figures 9 and 10 that the side knuckles h, h project a short distance from
the face of the base plate a in order to leave sufficient space for the proper working
of the heel piece or stop k of the lever between the joint and the spring c, c³ (see
Figure 2).
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim as our invention of Improvements in the manufacture of the metallic
parts of files for filing letters invoices and papers of the kind commonly called
Apronfiles
D
First Making from one piece of sheet metal the lever of the jointed upper half
loop of the file; together with the middle knuckle of the joint and the curved heel
piece or stop of the said lever substantially as hereinbefore described and illustrated
in the accompanying Drawing.
Secondly. Making from the sheet metal base plate of the file the side knuckles
of the joint of the lever and the spring by which the said lever is held in its
open and closed positions respectively substantially as herein before described and
illustrated in the accompanying Drawing,