to be Used in their Manufacture.
Year: 1886

page_text: to be Used in their Manufacture.
*
I, JOHN GEORGE HARRISON, of Noel, Road Edgbaston near Birmingham, in the
County of Warwick Manager of Works,, do hereby, declare, the nature of said,
invention for. "IMPROVEMENTS, IN GRIDIRON, CARRIAGE, STEPS, AND, IN DIES OR,
TOOLS TO BE USED IN THEIR MANUFACTURE," and in what, manner, the same is to,
be performed; to be particularly described and, ascertained in and by the following
statement:
As ordinarily constructed, and by Letters Patent granted to John Grice and Eli
James Harrison and John George Harrison and respectively dated the 6th day of
May 1873 and numbered 1625 and the 12th day of March 1885 and numbered 3225,
gridiron carriage steps are made with their bars and boundary framings narrower'
at their tops or upper sides than at their undersides, and when in use, the said bars
and the gaps between the bars and framing in consequence of being broader on
their undersides than at their tops, become clogged by dirt and snow accumulations,
particularly the latter in frosty weather,
The object of my invention is to remedy these defects, by making the bars and
boundary framings of the said gridiron carriage steps or treads of such a form, that
they shall constantly, clear themselves or prevent the attachment of any accumu-
lations when in use; and this I do, by making the bars and the boundary framing
broader at their tops or upper, sides, than at their undersides; that is, I make the
tops of the bars impend, project, jut or hang over the bottoms, and to do so, I make
the bars and the framings wedge or, dovetail like in cross section, with the broader
or base parts presented to the tread; so that any dirt, snow or ice accumulations
can have no solid bearing, in consequence of the formation of the bars and boundary
framing being made self clearing when in use.
!! 2
My invention consists secondly in dies or tools to be used in the manufacture or
production of the steps aforesaid, with or without, pyramid or other roughings
situated upon the broadened out tops of the bars and framing.
I will now proceed to describe with reference to the accompanying Drawings the
manner in which the same is to be performed."
117
2
A
Figure 1 represents in plan a, circular, gridiron, carriage step, made according to
my invention Figure 2 is a vertical section of the same taken upon the dotted:
lines A B figure 1-Figure 3 is a plan of a rectangular gridiron carriage step
constructed, according to my invention Figure 4 is a transverse section of the
top and bottom dies or tools employed in their manufacture-Figure 5 is a vertical
1
qua!

page_text: section of the dies together with an unfinished step between them-Figure 6 is the
said step separately, showing the thin webs between the bars and surrounding the
framing which are subsequently removed by clipping tools-Figure 7 is a plan of
the lower die, and figure 8 is a plan of underside of upper die employed in the
production of a circular carriage step, as represented in figures 1 and 2.
I will first describe the construction of my new or improved carriage step as
represented in figures 1, 2 and 3.
a is the boundary framing with cross bars b, which are broader at their tops or
uppersides 6 than at their bottoms or undersides 68, by making the sides incline
downwards; and likewise the boundary framing a is made broader at the upper
sides a² than at the undersides a³; or the top edge is made to impend or hang
over the bottoms, which thereby renders the step self clearing of any accumulations
that may be deposited thereon when in use-care pyramid or other roughings
standing from the top broadened out faces of the bars and framing, and d is the
shank which may be attached by welding as in the first herein before cited Letters
Patent or made solid as in the second cited Letters Patent.
Instead of the bars being disposed at right angles to the shank, they may run
in the same or oblique directions.
The construction of the dies for the production of the said gridiron carriage steps
is as follows (see figures 4, 5, 7 and 8).
e is a top die, and f is a lower die; the former having a cavity or depression e
formed within its underside, equal or nearly equal to one half of the depth of a
step, and with the top or underside g of the said sunken part lying or disposed in
the same plane as the top faces of the bars will be in a step; and sunken within
the said underside are roughing depressions h, which when reproduced in a step.
come upon the broadened out tops of the bars and framing.
The lower die f consists of a bed i, elevated or raised above the plane of the face
of the die, and surrounded by an annular trough like depression j of a depth about
equal to one half of the boundary of the framing of a carriage step; and within
this depression, the lower half of the carriage step framing is fashioned; and lying
crosswise within the said elevated part, V sunken depressions are made, and
within which depressions the metal to form the bars is pressed in the process of
stamping.
In carrying out the manufacture of steps as described, by the aid of the said
dies, I proceed in the usual way as follows--
I take a blank of the general shape of a step to be formed, and afterwards heat
it to a forging heat, and by means of a stamp and the dies figures 5, 7 and 8, I give
the blank the general shape of the step; the percussive action of the drop stamp
forces the soft metal or heated iron, into the interstices of the dies as shown at
figure 5-The roughly formed step figure 6 has fins or diaphragm webs or plates
running around the middle of the boundary framing, and between the tops of the
bars and the insides of the frame, which are removed by a pair of clearing dies, and
a step produced as represented in figure 1.
The die e instead of being the top die, may be the bottom die, and the bottom
die may be the top die, but I prefer the arrangement as shown, as sharper
roughings are obtained, and all scale or dirt is prevented from accumulating or
getting into the parts.
•
In manufacturing gridiron carriage steps of other shapes, with tapering or
overhanging parts as described, I proceed in the same manner as described, with
any modifications as the different shapes of steps require.
The gridiron steps described, may be made if desired without the roughings.
Having now particularly described and ascertained the nature of. my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
First Giving to the bars and boundary framings surrounding the bars of grid-
iron carriage steps, an impending or overhanging figure, with inclined undercut
1
-

page_text: sides, by making the bars and framing, or the bars alone, and framing alone, broader
at their tops or top edges, than at their bottoms or undersides, substantially as
and for the purpose herein described and set forth in figures 1, 2 and 3 of the
accompanying Drawings.
Secondly The combination of pyramid or other roughings with inpending or
overhanging bars and framing, or bars alone, and framing alone, substantially as
described and illustrated.
Thirdly-The construction of dies for the formation or manufacture of impending
or overhanging bars and framings (or bars alone and framings alone) of gridiron
carriage steps, by making one die sunken and the other die step like, or a middle
portion elevated above the general plane of the face of the die, with an annular
trough like depression running around it, and which said raised part has V cross
channels sunk within its face, substantially as described and illustrated in figures 4,
5, 7 and 8.