IMPROVEMENTS IN PORTABLE TODAS
Year: 1881

page_text: LETTERS PATENT to George Henry Pym, of the Town and County of the
Town of Nottingham, for an Invention of "IMPROVEMENTS IN PORTABLE
TODAS"
PROVISIONAL SPECIFICATION left by the said George Henry Pym at the
Office of the Commissioners of Patents on the 8th November 1881.
GEORGE HENRY РYж, of the Town and County of the Town of Nottingham.
"IMPROVEMENTS IN PORTABLE FORGES."
I construct a trough or hearth of sheet iron provided at one end with a tuyero,
having a sheet iron hood over it, and one end of a metal pipe secured to the back
of it, the opposite end of the pipe being attached to the outlet orifice of a circular
fan, the axle of which at one end is formed to receive a cylinder of indiarubber,
which pressing upon the turned up rim of a metal fly wheel is revolved at any
required speed by the following means the hearth above named is supported at a
suitable height by metal standards under it, which carry or form bearings for the
axle of the fly wheel, one end of the axle is provided with a coned friction clutch,
carrying a toothed wheel, the teeth of which takes into the links of a short chain,
one end of which hooks onto one end of a bent lever terminating in a handle for
the use of the workman, the other end of the chain being attached to a hooked
rod adjustable in the opposite end of the bent lever, the clutch being self-acting,
the workman can produce a continuous revolution of the fly wheel at will, tho
standard before named may also form the connecting pipe between the fan and
tuyer.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent and of
an Order of the Lord Chancellor filed by the said George Henry Pym in the
Great Seal Patent Office on the 4th July 1882.
GEORGE HENRY PYM of the Town and County of the Town of Nottingham.
"IMPROVEMENTS IN PORTABLE FORGES."
I construct a trough or hearth of sheet iron provided at one end with a tuyer
having a sheet iron hood over it, and one end of a metal pipe secured to the back
of it, the opposite end of the pipe being attached to the outlet orifice of a circular
fan the axle of which at one end is formed to receive a cylinder of india-rubber
which pressing upon the turned up rim of a metal fly wheel is revolved at any
required speed by the following means, the hearth above named is supported at a
suitable height by metal standards under it, which carry or form bearings for the
axle of the fly wheel, one end of the axle is provided with a coned friction clutch,
carrying a toothed wheel, the teeth of which takes into the links of a short chain,
one end of which hooks on to one end of a bent lever terminating in a handle for
the use of the workman, the other end of the chain being attached to a hooked
rod, adjustable in the opposite end of the bent lever, the clutch being self-acting
the workınan can produce a continuous revolution of the fly wheel at will, the
standard before_named_may_also_form_the_connecting-pipe-between-the-fan-and-
improvements.
Figure 2 a side view of the same, and,
Figures 3 to 7 various views of my driving clutch each severally referred to
hereafter.
My improvements in portable forges are as follows.
I construct a trough or hearth A of sheet iron having a hood or screen at one
end which is provided with a tuyer B (shewn by dotted lines at Figure 2) attached
to the upper end of a metal pipe C at the back of it, the lower end of the pipe
being attached to the outlet orifice of a circular fan C' the axle C of which at one
end may be formed to receive a cylinder of india-rubber to press upon the turned
up rim of a metal fly wheel or the end of the axle may be V grooved on its
circumference to receive the projecting portion of an india-rubber, gut, or leather
band, which lies in a groove cut in the circumference of the fly wheel D, (as shewn
in the Drawings) or the fly wheel may be placed with its circumference a short
distance from the fan axle, and the band be of sufficient length to be crossed, and
passed round the V grooved axle, whichever method is employed to drive the fan,
the fly wheel is revolved at any required speed by the following means. The
hearth above named is supported at a suitable height by metal standards under it,
to one of which is secured a bearing E for the axle of the fly wheel, the outer side
of the boss of which is turned out to receive a coned friction clutch F the outer
side of which forms a boss carrying two inclined teeth F', shewn in edge view at
Figure 3, and in side view at Figure 6, these teeth take into recesses formed for
them in a boss G shewn in edge view at Figure 5 enclosed by a ring G' which
excludes dust, or the boss and ring may be in one piece in either case the boss is
provided with teeth, which take into open links of a short chain H, the back end
of which hooks on to one end of a bent lever I, and the front end terminates in a
screw capable of adjustment by means of a wing nut in the front end of the lever.

page_text: The bent lever is provided with a handle capable of adjustment upon it, for either
a long stroke or a short one, by such means, as the handle is depressed the chain
will revolve, the recessed boss G in the direction of the arrow shewn at Figure 5
and press the longest sides of the recesses into the inclined teeth F' thereby forcing
the clutch F into the recess of the boss of the wheel 1) and cause it to revolve and
drive the axle C of the circular fan, and each time the handle is raised, the short
sides of the recesses in the boss G will press upon the short sides of the inclined
teeth F and withdraw the cone F clear of the coned recess in the fly wheel and
thus allow it to revolve, it being continually driven forward at each depression of
the handle.
A clutch constructed as above described being self-acting the workman can
produce a powerful continuous blast by the revolution of the fly wheel at will.
Figure 4 is an outside view of any self-acting clutch and Figure 7 an outer
end view of the same with the lock nuts G³, which allows of adjustment of the
clutch removed.
Having now described the nature of my said Invention and in what manner the
same may be performed I declare that I claim :—
The construction and employment of a self-acting clutch for operating the fan
of a portable forge, substantially as hereinbefore described and illustrated in the
Drawings annexed.
In witness whereof I the said George Henry Pym, have hereunto set my
hand and seal this Twentieth day of June iu the year of our Lord, One
thousand eight hundred and eighty-two.
GEO. HY. PYM. (L.S.)
I hereby certify that this Specification has been submitted to me in accordance
with the judgment delivered by me on the 7th day of June 1882 in the matter of
the Objection of one Walter Alfred Barlow to the grant of Letters Patent to the
above named George Henry Pyin for the herein before described Invention and also
that the same meets with my approval,
1. Inter fourth day of Tuna 1985